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Panasonic U-8ME2E8 Service Manual & Test Run Service Manual

2way system, r410a
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Order No. SBPAC1607005CE
SERVICE MANUAL & TEST RUN SERVICE MANUAL
Model No.
Outdoor Unit
Rated Capacity
Type Outdoor Unit Type
8 HP
10 HP
12 HP
14 HP
16 HP
18 HP
20 HP
ME2
2WAY System
U-8ME2E8
U-10ME2E8 U-12ME2E8
U-14ME2E8
U-16ME2E8
U-18ME2E8
U-20ME2E8
SM830253-00
85464849353000
REFERENCE NO.
Table of Contents
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Summary of Contents for Panasonic U-8ME2E8

  • Page 1 SERVICE MANUAL & TEST RUN SERVICE MANUAL Model No. Outdoor Unit Rated Capacity Type Outdoor Unit Type 8 HP 10 HP 12 HP 14 HP 16 HP 18 HP 20 HP 2WAY System U-8ME2E8 U-10ME2E8 U-12ME2E8 U-14ME2E8 U-16ME2E8 U-18ME2E8 U-20ME2E8 SM830253-00 85464849353000 REFERENCE NO.
  • Page 2 Model No. Indoor Units Rated Capacity Type Indoor Unit Type 1-Way Cassette S-28MD1E5 S-36MD1E5 S-45MD1E5 S-56MD1E5 2-Way Cassette S-22ML1E5 S-28ML1E5 S-36ML1E5 S-45ML1E5 S-56ML1E5 4-Way Cassette S-22MU1E5A S-28MU1E5A S-36MU1E5A S-45MU1E5A S-56MU1E5A S-60MU1E5A 4-Way Cassette 60 × 60 S-15MY2E5A S-22MY2E5A S-28MY2E5A S-36MY2E5A S-45MY2E5A S-56MY2E5A Wall-Mounted S-45MK1E5A S-56MK1E5A Wall-Mounted...
  • Page 3 • Do not supply power to the unit until Permission from the power supplier is required when all wiring and tubing are completed or installing the U-8ME2E8 and U-10ME2E8 outdoor units that are connected to a 16 A distribution reconnected and checked.
  • Page 4 When Transporting When Connecting Refrigerant Tubing • It may need two or more people to carry out the installation work. Pay particular attention to refrigerant leakages. • Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and bend your knees WARNING when lifting to reduce strain on your back.
  • Page 5 When Servicing Others • Turn the power OFF at the main CAUTION power box (mains), wait at least 10 minutes until it is discharged, then • Do not touch the air inlet or open the unit to check or repair the sharp aluminum fins of the electrical parts and wiring.
  • Page 6 Check of Density Limit The standards for minimum room volume are as follows. (1) No partition (shaded portion) Check the amount of refrigerant in the system and floor space of the room according to the legislation on refrigerant drainage. If there is no applicable legislation, follow the standards described below.
  • Page 7 Precautions for Installation Using New Refrigerant 1. Care regarding tubing 1-1. Process tubing Material: Use seamless phosphorous deoxidized copper tube for refrigeration. Wall thickness shall comply with the applicable legislation. The minimal wall thickness must be in accordance with the table below. For tubes of ø22.22 or larger, use the material of temper 1/2H or H (Hard copper tube).
  • Page 8 Important Information Regarding The Refrigerant Used This product contains fluorinated greenhouse gases covered by the Kyoto Protocol. Do not vent gases into the atmosphere. Refrigerant type: R410A value: 1975 GWP = global warming potential Periodical inspections for refrigerant leaks may be required depending on European or local legislation. Please contact your local dealer for more information.

  • Page 9: Table Of Contents

    — CONTENTS — Section 1: CONTROL FUNCTIONS - Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Introduction .
  • Page 10 Section 4: OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER . . . . . . . . . . . . 4-1 Overview ............. . . 4-2 Functions .

  • Page 11: Control Functions - Outdoor Unit

    2WAY SYSTEM Contents Control Functions - Outdoor unit 1. CONTROL FUNCTIONS - Outdoor unit 1. Introduction ............1-2 2.

  • Page 12: Introduction

    2WAY SYSTEM 1. Introduction Control Functions - Outdoor unit 1. Introduction ● The ME2 series outdoor units are systems that allows multiple outdoor units to be connected. ● All the outdoor units do not utilize the sub units that were used in earlier systems. The O/U.ADD of outdoor unit PCB where the unit is set to “1”...

  • Page 13: Selecting Outdoor Unit For Operation

    2WAY VRF SYSTEM 2WAY SYSTEM 2. Selecting Outdoor Unit for Operation 2. Selecting Outdoor Unit for Operation Control Functions Control Functions - Outdoor unit Outdoor Unit Operating Rules (1) Outdoor Unit Operating Rules As a result of setting the main outdoor and sub outdoor units due to the O/U.ADD setting, the order of priority for the outdoor units is determined in small values of O/U.ADD sequence.
  • Page 14 2WAY VRF SYSTEM 2WAY SYSTEM 2. Selecting Outdoor Unit for Operation 2. Selecting Outdoor Unit for Operation Control Functions Control Functions - Outdoor unit (3) Outdoor Unit Stop Rules 1. Stopping of all outdoor units When all outdoor units must stop, all units will stop in order of unit No. every one second. 2.

  • Page 15: Compressor Control

    2WAY VRF SYSTEM 2WAY SYSTEM 3. Compressor Control 3. Compressor Control Control Functions Control Functions - Outdoor unit (1) Compressors Mounted in the Outdoor Units Type of outdoor unit 10HP 12HP 14HP 16HP 18HP 20HP Inverter compressor Compressor 1 (High pressure rotary) Inverter compressor Compressor 2 (High pressure rotary)
  • Page 16 2WAY VRF SYSTEM 2WAY SYSTEM 3. Compressor Control 3. Compressor Control Control Functions - Outdoor unit Control Functions 2. Operating compressors The compressor with higher priority order starts according to the priority orders described on previous page. 3. Stopping compressors The compressor with lower priority order stops according to the priority orders described on previous page.
  • Page 17 2WAY VRF SYSTEM 2WAY SYSTEM 3. Compressor Control 3. Compressor Control Control Functions - Outdoor unit Control Functions (5) Forced Stopping of Compressor Once a compressor stops, it will not start for a period of 3 minutes (3-minute forced OFF). However, this is not applied when the compressor was forced to stop as the result of a special control operation.
  • Page 18 2WAY VRF SYSTEM 2WAY SYSTEM 3. Compressor Control 3. Compressor Control Control Functions Control Functions - Outdoor unit 6-1. Evaporation temperature (= Te) control The cooling capacity is adjusted with this control. It prevents freezing of the indoor unit heat exchanger and the dew to the outside panel of the indoor unit.
  • Page 19 2WAY VRF SYSTEM 2WAY SYSTEM 3. Compressor Control 3. Compressor Control Control Functions Control Functions - Outdoor unit ・Standard setting (at factory shipment) °C °C Thermostat Thermostat Area D Area D PX=58.0 PX=58.0 57.9 57.9 Compressor Compressor Area C Area C capacity capacity decrease...
  • Page 20 2WAY VRF SYSTEM 2WAY SYSTEM 3. Compressor Control 3. Compressor Control Control Functions Control Functions - Outdoor unit When the temperature falls in the Area D (over PX temperature), the operation stops within 0 to 30 seconds at the interval of the roadmap control. After Tc falls in the Area D and the thermostat is turned OFF, the system may resume operating from the lower compressor capacity.
  • Page 21 2WAY VRF SYSTEM 2WAY SYSTEM 3. Compressor Control 3. Compressor Control Control Functions Control Functions - Outdoor unit Current protection This restriction protects the compressor and controls the compressor electric current simultaneously. The current limitation value changes to “normal status” and “overload status” according to the outdoor temperature.

  • Page 22: Special Control

    2WAY VRF SYSTEM 2WAY SYSTEM 4. Special Control 4. Special Control Control Functions Control Functions - Outdoor unit Items Remarks Indication on PCB 4-way valve Save valve SAVE Oil recovery valve ORVR Solenoid valve By-pass valve Accumulator valve valve MOV for heat exchanger 1 MOV1 Motor Operated Valve MOV for heat exchanger 2...
  • Page 23 2WAY VRF SYSTEM 2WAY SYSTEM 4. Special Control 4. Special Control Control Functions Control Functions - Outdoor unit (3) Oil Recovery Valve [ORVR] The purpose of this valve is to recover oil from the oil separator of its own outdoor unit or balance tube to the compressor.
  • Page 24 2WAY VRF SYSTEM 2WAY SYSTEM 4. Special Control 4. Special Control Control Functions Control Functions - Outdoor unit (7) Electronic Control Valves [MOV1, MOV2] 7-1. Type of Electronic control valves MOV1 : For upper side heat exchanger MOV2 : For lower side heat exchanger 7-2.
  • Page 25 2WAY VRF SYSTEM 2WAY SYSTEM 4. Special Control 4. Special Control Control Functions Control Functions - Outdoor unit (8) SC Circuit Electronic Control Valve [MOV4] 8-1. Cooling SC Control During cooling operation, the liquid refrigerant which condenses at the outdoor unit heat exchanger flows into the receiver tank, and SC (sub-cool = super-cooling) approaches 0 degree.

  • Page 26: Outdoor Unit Fan Control

    2WAY VRF SYSTEM 2WAY SYSTEM 5. Outdoor Unit Fan Control 5. Outdoor Unit Fan Control Control Functions Control Functions - Outdoor unit (1) Number of Fan Motor 8〜16HP 18･20HP Type of outdoor unit Number of fan motor (2) Fan Mode These outdoor units utilize a DC fan motor that can be controlled in a maximum of 13 steps (13 modes) in ordinary mode.
  • Page 27 2WAY VRF SYSTEM 2WAY SYSTEM 5. Outdoor Unit Fan Control 5. Outdoor Unit Fan Control Control Functions Control Functions - Outdoor unit Temperature of Outdoor (TO) 18･20HP 0°C ≤ TO 10°C ≤ TO 20°C ≤ TO 30°C ≤ TO TO < 0°C TO ≥...
  • Page 28 2WAY VRF SYSTEM 2WAY SYSTEM 5. Outdoor Unit Fan Control 5. Outdoor Unit Fan Control Control Functions Control Functions - Outdoor unit (6) Silent Mode Selecting the silent mode results in operation that gives priority to reducing noise at the outdoor unit. When the setting is in silent mode, the outdoor fan mode and the maximum frequency is limited.
  • Page 29 2WAY VRF SYSTEM 2WAY SYSTEM 5. Outdoor Unit Fan Control 5. Outdoor Unit Fan Control Control Functions Control Functions - Outdoor unit (8) Snow Removal Control 8-1. Independent control of outdoor unit This control is intended to prevent snow from accumulating on stopped fans. The fan motor rotates at 500rpm in the below conditions even if the outdoor unit stops.

  • Page 30: Outdoor Unit Ccu (Command Controller Unit) Control

    2WAY VRF SYSTEM 6. Outdoor Unit CCU (command controller 2WAY SYSTEM 6. Outdoor Unit CCU (command controller unit) Control Control Functions unit) Control Control Functions - Outdoor unit Some actuators of indoor unit are controlled by CCU. MOV of Indoor Unit 1-1.
  • Page 31 6. Outdoor Unit CCU (command controller 2WAY VRF SYSTEM 2WAY SYSTEM 6. Outdoor Unit CCU (command controller unit) Control Control Functions unit) Control Control Functions - Outdoor unit unit : pulse 1-2. Indoor unit with RAP valve kit Operating Operating Operating Thermostat mode of...
  • Page 32 2WAY VRF SYSTEM 6. Outdoor Unit CCU (command controller 2WAY SYSTEM 6. Outdoor Unit CCU (command controller unit) Control Control Functions unit) Control Control Functions - Outdoor unit (2) RAP Valve Kit Operating Operating Operating Thermostat RAP valve kit mode of mode of mode of ON/OFF...
  • Page 33 2WAY VRF SYSTEM 6. Outdoor Unit CCU (command controller 2WAY SYSTEM 6. Outdoor Unit CCU (command controller unit) Control Control Functions unit) Control Control Functions - Outdoor unit 3-2. Heating mode The indoor unit fan in heating mode is stopped from the CCU in the following condition. Discharge air temperature of indoor unit ≤...
  • Page 34 6. Outdoor Unit CCU (command controller 2WAY VRF SYSTEM 2WAY SYSTEM 6. Outdoor Unit CCU (command controller unit) Control Control Functions unit) Control Control Functions - Outdoor unit * Operating time “XX” under the section “(4) Drain Pump Control” described on previous page is able to set in EEPROM of the main outdoor unit.

  • Page 35: Oil Control

    2WAY VRF SYSTEM 2WAY SYSTEM 7. Oil Control 7. Oil Control Control Functions Control Functions - Outdoor unit (1) Oil Level Oil level State Conditions of oil level in compressor Judgment Sufficient The compressor contains sufficient oil. There is no problem. Confirm that oil is improved after performing Possibility of There will be a risk of oil shortage soon.
  • Page 36 2WAY VRF SYSTEM 2WAY SYSTEM 7. Oil Control 7. Oil Control Control Functions Control Functions - Outdoor unit System Oil Recovery Control The system oil recovery control is performed by operating all the systems. If the stopped outdoor unit exists, the unit starts operating and the system oil recovery control is performed. 5-1.
  • Page 37 2WAY VRF SYSTEM 2WAY SYSTEM 7. Oil Control 7. Oil Control Control Functions Control Functions - Outdoor unit 5-2. Simplified flow of system oil recovery control The system oil recovery control shall be performed as the flow mentioned below. Normal operation → System oil recovery control → Normal operation In the case of cooling mode Control time For 2 minutes *...

  • Page 38: Way Valve Adjustment Control

    2WAY VRF SYSTEM 2WAY SYSTEM 8. 4-Way Valve Adjustment Control 8. 4-Way Valve Adjustment Control Control Functions Control Functions - Outdoor unit The purpose of this control is to change over the 4-way valve appropriately with big pressure difference. This control is performed at the following conditions. The first operation after turning on power supply to outdoor unit.

  • Page 39: Defrost Control

    2WAY VRF SYSTEM 2WAY SYSTEM 9. Defrost Control 9. Defrost Control Control Functions Control Functions - Outdoor unit (1) Type of Defrost Control This system uses the following 2 defrosting systems. System configuration Name of defrost control Only 1 outdoor unit in the refrigerant system Reverse cycle defrost 2 or more outdoor units in the refrigerant system Outdoor unit cycle defrost...
  • Page 40 2WAY VRF SYSTEM 2WAY SYSTEM 9. Defrost Control 9. Defrost Control Control Functions Control Functions - Outdoor unit Heating Operation Set Time (Defrosting Operation Prohibiting Time) When the heating operation time at system has exceeded “XX” minutes (40 minutes at initial setting), and at least one unit satisfies the decision of defrosting, the defrosting operation is effective.
  • Page 41 2WAY VRF SYSTEM 2WAY SYSTEM 9. Defrost Control 9. Defrost Control Control Functions Control Functions - Outdoor unit (7) Outdoor Unit Cycle Defrost Outdoor unit cycle defrost is performed in systems where 2 or more outdoor units are connected to the refrigerant system.

  • Page 42: Demand Control

    2WAY VRF SYSTEM 2WAY SYSTEM 10. Demand Control 10. Demand Control Control Functions Control Functions - Outdoor unit Usual Demand Control The standard value of the limit current is the table below. unit:Amp. Type of outdoor unit 10HP 12HP 14HP 16HP 18HP 20HP...
  • Page 43 2WAY SYSTEM 2WAY SYSTEM 10. Demand Control 10. Upper Current Limitation Mode Control Functions - Outdoor unit Control Functions-Outdoor Unit NOTE Since the pattern “A” and “B” perform the outdoor unit current demand control (compressor’s suppressive drive), it is easy to grasp energy saving amount. However, it may cause the reduction of capacity in all indoor units of the same refrigerant system.
  • Page 44 2WAY SYSTEM 2WAY SYSTEM 2WAY SYSTEM 10. Upper Current Limitation Mode 10. Demand Control 10. Demand Control Control Functions-Outdoor Unit Control Functions Control Functions - Outdoor unit (4) When Using Demand Terminal Block *Demand terminal block is a separate purchase (optional part). Demand terminal block must be connected in order to perform the demand control.

  • Page 45: Backup Operation

    2WAY VRF SYSTEM 2WAY SYSTEM 11. Backup Operation 11. Backup Operation Control Functions Control Functions - Outdoor unit Automatic Backup Operation The system includes a function for automatic backup operation. An alarm is displayed on the remote controller to inform the user that a failure has occurred. 1-1.
  • Page 46 2WAY VRF SYSTEM 2WAY SYSTEM 11. Backup Operation 11. Backup Operation Control Functions Control Functions - Outdoor unit Alarm List 2 (Backup operation continues unless power supply of all outdoor units is turned off.) Compressor Alarm Description / outdoor unit display operation Compressor 1 discharge thermistor error...
  • Page 47 2WAY VRF SYSTEM 2WAY SYSTEM 11. Backup Operation 11. Backup Operation Control Functions Control Functions - Outdoor unit Manual Backup Operation The manual backup can be used when it is necessary to close the service valve for maintenance, etc. Backup operation procedure 2-1.
  • Page 48 2WAY VRF SYSTEM 2WAY SYSTEM 11. Backup Operation 11. Backup Operation Control Functions Control Functions - Outdoor unit All compressors of outdoor unit number 2 are backed up Examples: Combination of 3 outdoor units with 2 compressors Unit No. 1 Unit No.

  • Page 49: Other Functions

    2WAY VRF SYSTEM 2WAY SYSTEM 12. Other Functions 12. Other Functions Control Functions Control Functions - Outdoor unit (1) Auto Cooling/Heating Function It is possible to select auto cooling/heating mode in each remote controller even in 2WAY VRF system. The system changes to cooling or heating operation according to number of thermostat ON mode. The system selects the mode that has more number of units with thermostat ON.
  • Page 50 3WAY SYSTEM 2WAY SYSTEM 13. Other Functions 12. Other Functions Control Functions Control Functions - Outdoor unit (2) Maintenance Function for Power Supply Stop of Indoor Unit (E06 ignore) The system can continue operation even if outdoor unit cannot communicate with some indoor units. It is necessary to set to EEPROM the allowed number of operating indoor units not to be able to communicate.

  • Page 51: Detailed Settings In Eeprom Of Outdoor Unit

    2WAY SYSTEM 13. Detailed Settings in EEPROM of Outdoor Control Functions - Outdoor unit Unit Never use the DN code unlisted in the following table. (P) : at factory shipment Item Setting No. 0=No sensor & control (P) 1=Sensor & control Operation for using snowfall sensor 2=No sensor &...
  • Page 52 2WAY SYSTEM 13. Detailed Settings in EEPROM of Outdoor Control Functions - Outdoor unit Unit Never use the DN code unlisted in the following table. (P) : at factory shipment Item Setting No. 0=Invalid 1=22 2=25 3=28 4=32 5=36 6=40 7=45 8=50 9=56...

  • Page 53: Outdoor Unit Control Pcb

    2WAY SYSTEM 14. Outdoor Unit Control PCB 1. Outdoor Unit Control PCB Control Functions - Outdoor unit (1) Outdoor Unit Control PCB EXL1,2(CN60) EXG1,2(CN61) LPS(CN49) OIL1,2(CN54) DISCH1(CN55) DISCH2(CN56) HPS(CN46) TO(CN53) CN22 CN23 CN33 SW3 SW2 SW1 CN25 CN24 CN34 SCT(CN65) SCG(CN77) CN40 CN30...
  • Page 54 2WAY SYSTEM 14. Outdoor Unit Control PCB 1. Outdoor Unit Control PCB Control Functions - Outdoor unit (2) Outdoor Unit HIC PCB 1 - 44...
  • Page 55 2WAY SYSTEM 14. Outdoor Unit Control PCB 1. Outdoor Unit Control PCB Control Functions - Outdoor unit (3) Outdoor Unit FIL PCB (4) Outdoor Unit FAN PCB 1 - 45...
  • Page 56 2WAY SYSTEM 14. Outdoor Unit Control PCB Control Functions - Outdoor unit (5) Functions A. ADD pin (2P, White) Auto address setting pin (CN30) • Short-circuit this pin for 1 second or longer to automatically set the addresses at the indoorunits that are connected to that outdoor unit and are within the same system.
  • Page 57 2WAY SYSTEM 14. Outdoor Unit Control PCB Control Functions - Outdoor unit Terminal pin (3P, Black) For communications circuit impedance matching (CN67) • A connecting socket (3P, Black) is attached to the terminal plug at the time of shipment from the factory.
  • Page 58 2WAY SYSTEM 14. Outdoor Unit Control PCB Control Functions - Outdoor unit Table 1. Setting the System Address [SW1: Rotary switch (Black), SW2: 2P DIP (Black)] SW2 setting SW2 setting Outdoor Outdoor system system setting setting address address (10s digit) (20s digit) (10s digit) (20s digit)

  • Page 59: Electrical Data

    Electrical Data 2WAY SYSTEM 15. Electrical Data 1. Outdoor Unit Control Functions - Outdoor unit (1) Electric Wiring Diagram U-8ME2E8, U-10ME2E8, U-12ME2E8 1 - 49...
  • Page 60 2WAY SYSTEM 1. Outdoor Unit 15. Electrical Data Control Functions - Outdoor unit Schematic Diagram U-8ME2E8, U-10ME2E8, U-12ME2E8 1 - 50...
  • Page 61 2WAY SYSTEM 1. Outdoor Unit 15. Electrical Data Control Functions - Outdoor unit (2) Electric Wiring Diagram U-14ME2E8, U-16ME2E8 1 - 51...
  • Page 62 2WAY SYSTEM 1. Outdoor Unit 15. Electrical Data Control Functions - Outdoor unit Schematic Diagram U-14ME2E8, U-16ME2E8 1 - 52...
  • Page 63 Electrical Data 2WAY SYSTEM 15. Electrical Data 1. Outdoor Unit Control Functions - Outdoor unit (3) Electric Wiring Diagram U-18ME2E8, U-20ME2E8 1 - 53...
  • Page 64 2WAY SYSTEM 15. Electrical Data 1. Outdoor Unit Control Functions - Outdoor unit Schematic Diagram U-18ME2E8, U-20ME2E8 1 - 54...

  • Page 65: Control Functions - Indoor Unit

    2WAY SYSTEM Contents Control Functions - Indoor Unit 2. CONTROL FUNCTIONS - Indoor Unit 1. Room Temperature Control ..........2-2 2.

  • Page 66: Room Temperature Control

    2WAY SYSTEM 1. Room Temperature Control Control Functions - Indoor Unit 1. Room Temperature Control The body sensor or remote controller sensor detects temperature in the room. The detected temperature is called the room temperature. The body sensor is the one contained in the indoor unit. Body sensor is enabled Remote controller sensor is enabled Set temp.
  • Page 67 2WAY SYSTEM 1. Room Temperature Control Control Functions - Indoor Unit Remote controller sensor is enabled Remote controller sensor is enabled Set temp. in remote Set temp. in remote 28℃ 28℃ 28℃ 20℃ 20℃ 20℃ controller controller Detected temp. by Detected temp.

  • Page 68: Heating Standby

    1. Room Temperature Control 2WAY SYSTEM 2. Heating Standby Control Functions - Indoor Unit < FRESH AIR INTAKE MODE (Type E2) > Intake Air Temperature Control This product brings outdoor fresh air into the building and adjusts and supplies the air with nearly current indoor temperature. Automatic cooling and heating operation mode Due to the temperature difference between the outdoor air and preset temperature in remote controller, cooling or heating operation can be automatically selected.

  • Page 69: Automatic Fan Speed Control

    2WAY SYSTEM 3. Automatic Fan Speed Control Control Functions - Indoor Unit 3. Automatic Fan Speed Control ① The indoor fan mode is controlled as shown below during the automatic fan mode. ② The fan mode does not change for 3 minutes during cooling operation and 1 minute during heating operation once it is changed.

  • Page 70: Indoor Unit Mov Control

    4. Indoor Unit MOV Control 2WAY SYSTEM Control Functions - Indoor Unit 5. Drain Pump Control 4. Indoor Unit MOV Control For details, see the Section 1. The MOV is at 480 pulses in the following cases. ① At the time of factory shipment ②...

  • Page 71: Automatic Heating / Cooling Control

    2WAY SYSTEM 6. Automatic Heating / Cooling Control Control Functions - Indoor Unit 6. Automatic Heating / Cooling Control )* : FRESH AIR INTAKE MODE (Type E2) This function is only valid as long as one indoor unit is installed within one refrigerant system or all indoor units are controlled within a group control.

  • Page 72: Discharge Air Temperature Control

    7. Discharge Air Temperature Control 2WAY SYSTEM Control Functions - Indoor Unit 8. RAP Valve Kit Control 7. Discharge Air Temperature Control Discharge air temperature is controlled using the indoor unit discharge air temperature sensor. The discharge air temperature is set in the EEPROM on the PCB. The setting is different depending on the model. Discharge air temperature setting (at the time of factory shipment) Discharge air temperature setting Indoor unit type...

  • Page 73: Automatic Flap Control

    9. Automatic Flap Control 2WAY SYSTEM Control Functions - Indoor Unit 10. Filter Sign 9. Automatic Flap Control The flap position can be selected from 5 positions. Operating mode Flap position Cooling / Dry F1・F2・F3 F1・F2・F3・F4・F5 Heating F1・F2・F3・F4・F5 ① The flap moves to the following position automatically when the indoor unit is stopped. F0 (close): Types K1, K2, T2, D1, U1, Y2 F5: Models other than the above ②...

  • Page 74: Fan Control During Dry Mode

    2WAY SYSTEM 11. Fan Control during Dry Mode Control Functions - Indoor Unit 11. Fan Control during Dry Mode The fan control during dry mode is as follows. T (deg) Set temp. in remote controller Fan mode A: Fan mode set in the remote controller B: Fan mode is L during thermostat ON, LL during thermostat OFF For details on T, see “1.

  • Page 75: Ventilation Fan Output

    12. Ventilation Fan Output 2WAY SYSTEM Control Functions - Indoor Unit 13. T10 Terminal 12. Ventilation Fan Output The output of ventilation turns ON when the indoor unit turns ON. Also, when the indoor unit turns OFF, the output of the ventilation turns OFF. The ventilation fan can also be turned ON and OFF using the ventilation button on the remote controller.

  • Page 76: Parameter

    2WAY SYSTEM 14. Parameter Control Functions - Indoor Unit 14. Parameter Heat / cool switching Correction temp. (heating) correction temp. (automatic heat / cool) Type Model Setting at time of factory Setting at time of factory shipment shipment 4-Way Cassette 4 deg 2 deg 4-Way Cassette 60×60...

  • Page 77: Outdoor Unit Repair Procedures

    2WAY SYSTEM Contents Outdoor Unit Repair Procedures 3. OUTDOOR UNIT REPAIR PROCEDURES 1. Removing Panels ............3-2 2.

  • Page 78: Removing Panels

    2WAY SYSTEM 1. Removing Panels Outdoor Unit Repair Procedures Be sure to turn off the power before maintenance. When the power is turned off, CAUTION wait for 5 minutes without any work. Then start working. (1) Front panel removal (Fig. 1) •...

  • Page 79: Discharging Compressor Oil

    2WAY SYSTEM 2. Discharging Compressor Oil Outdoor Unit Repair Procedures Power outlet panel Compressor upper cover Front panel Front panel Tubing cover Compressor front cover Type 18HP / 20HP Fig. 1-d Discharged oil can be used for checking the condition of the system. Based on the appearance and color of the discharged oil, a judgment can be made on whether the system is operating normally or not.
  • Page 80 2WAY SYSTEM 2. Discharging Compressor Oil Outdoor Unit Repair Procedures Low-pressure outlet port (for ø7.94mm-dia connector) High-pressure outlet port (for ø7.94mm-dia connector) Manifold gauge Nitrogen gas Liquid tube service port Gas tube service port (for ø7.94mm-dia connector) (for ø7.94mm-dia connector) Packless valve or the like Container Oil balance tube service port...
  • Page 81 2WAY SYSTEM 2. Discharging Compressor Oil Outdoor Unit Repair Procedures Low-pressure outlet port (for ø7.94mm-dia connector) High-pressure outlet port (for ø7.94mm-dia connector) Manifold gauge Nitrogen gas Gas tube service port (for ø7.94mm-dia connector) Liquid tube service port (for ø7.94mm-dia connector) Packless valve or the like Container Oil balance tube service port...

  • Page 82: Backup Operation

    2WAY SYSTEM 3. Backup Operation Outdoor Unit Repair Procedures This system includes an emergency automatic backup function that allows the A/C to operate during the period after trouble occurs until repairs are made. However, during repair and at other times, use manual backup operation. 3-1.
  • Page 83 2WAY SYSTEM 3. Backup Operation Outdoor Unit Repair Procedures After recovery work is completed, wire the communication lines between indoor CAUTION and outdoor units again. If it not finished yet, an alarm is emitted immediately. (2) Adjusting the refrigerant for backup operation During backup operation, all of the service valves on the failed unit are closed.

  • Page 84: Recovering Refrigerant

    2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures The following equipment and tools are required: Jumper wire with clips, adjustable wrench, set of manifold gauge valves specially designed for refrigerant R410A only, vacuum pump, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, flathead screwdriver, and outdoor unit maintenance remote controller.
  • Page 85 2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures Manifold gauge High-pressure Refrigerant outlet port recovery unit (for ø7.94mm-dia connector) Refrigerant recovery cylinder Gas tube Low-pressure outlet port service port (for ø7.94mm-dia connector) (for ø7.94mm-dia Liquid tube service port connector) (for ø7.94mm-dia connector) Type 12HP Fig.
  • Page 86 2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures Manifold gauge High-pressure outlet port Refrigerant (for ø7.94mm-dia recovery unit connector) Refrigerant recovery cylinder Gas tube service port Low-pressure outlet port (for ø7.94mm-dia (for ø7.94mm-dia connector) connector) Liquid tube service port (for ø7.94mm-dia connector) Type 18HP / 20HP Fig.
  • Page 87 2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4-2. Refrigerant Recovery Procedures (Indoor Unit) The flowchart below shows the refrigerant recovery procedures you must follow when replacing or repairing the indoor unit due to trouble in the refrigerant circuit. START 4-2-1.
  • Page 88 2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures (2) If the remote controller is not available for maintenance of the outdoor unit 1 Determine the outdoor unit where the unit No. setting (SW5) on the outdoor unit control PCB is set to No. 1. 2 Short-circuit the MODE pin ("COOL"...
  • Page 89 2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4-2-3. Refrigerant recovery procedures (2): Indoor unit with no ball valve equipped Refrigerant in all indoor units and the refrigerant tubing circuit can be pumped into the outdoor unit. The maximum refrigerant storage capacity per a single outdoor unit is approx.
  • Page 90 2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures Manifold gauge High-pressure outlet port (for ø7.94mm-dia connector) Refrigerant Low-pressure outlet port recovery unit (for ø7.94mm-dia connector) Gas tube service port (for ø7.94mm-dia connector) Refrigerant recovery cylinder Liquid tube service port (for ø7.94mm-dia connector) Type 8HP / 10HP Fig.
  • Page 91 2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures Manifold gauge Refrigerant High-pressure recovery unit outlet port Low-pressure outlet port (for ø7.94mm-dia (for ø7.94mm-dia connector) connector) Refrigerant recovery cylinder Gas tube service port Liquid tube service port (for ø7.94mm-dia (for ø7.94mm-dia connector) connector) Type 14HP / 16HP Fig.
  • Page 92 2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4-3. Recovery of Refrigerant from Entire System (1) Turn off power to the entire outdoor system. (2) Short-circuit the AP pin (CN24) on the outdoor control PCB of all outdoor units, then supply power to the outdoor units.

  • Page 93: Checking For Leakage After Repair

    2WAY SYSTEM 5. Checking for Leakage After Repair Outdoor Unit Repair Procedures 5-1. Pressure Check for Leakage of Outdoor Unit After completing repair of the outdoor unit, carry out the following leakage check. (1) Check that all service valves for gas tubes, liquid tube, and balance tube in the repaired outdoor unit (units necessary to carry out the pressurized leak check) are fully closed.
  • Page 94 2WAY SYSTEM 5. Checking for Leakage After Repair Outdoor Unit Repair Procedures Manifold gauge Nitrogen gas High-pressure outlet port (for ø7.94mm-dia connector) Low-pressure outlet port Gas tube (for ø7.94mm-dia connector) service port (for ø7.94mm-dia connector) Liquid tube service port (for ø7.94mm-dia connector) Type 12HP Fig.
  • Page 95 2WAY SYSTEM 5. Checking for Leakage After Repair Outdoor Unit Repair Procedures Manifold gauge Nitrogen gas High-pressure outlet port (for ø7.94mm-dia Low-pressure outlet port connector) (for ø7.94mm-dia connector) Gas tube service port Liquid tube service port (for ø7.94mm-dia (for ø7.94mm-dia connector) connector) Type 18HP / 20HP Fig.

  • Page 96: Evacuating System

    2WAY SYSTEM 6. Evacuating System Outdoor Unit Repair Procedures This procedure is carried out to ensure there is no remaining refrigerant or other gases (nitrogen, etc.) in the repaired outdoor unit and tubing. 6-1. Evacuating Repaired Outdoor Unit (1) Check that each service valve of the gas tubes, liquid tube, and balance tube in the outdoor unit are fully closed. (2) Connect the manifold gauge valves to the high-pressure and low-pressure sensor outlets of the outdoor unit.
  • Page 97 2WAY SYSTEM 6. Evacuating System Outdoor Unit Repair Procedures Manifold gauge Vacuum pump High-pressure outlet port (for ø7.94mm-dia Low-pressure outlet port connector) (for ø7.94mm-dia connector) Gas tube service port Liquid tube service port (for ø7.94mm-dia (for ø7.94mm-dia connector) connector) Type 12HP Fig.
  • Page 98 2WAY SYSTEM 6. Evacuating System Outdoor Unit Repair Procedures Manifold gauge Vacuum pump High-pressure outlet port (for ø7.94mm-dia connector) Low-pressure outlet port Gas tube (for ø7.94mm-dia connector) service port (for ø7.94mm-dia Liquid tube service port connector) (for ø7.94mm-dia connector) Type 18HP / 20HP Fig.

  • Page 99: Charging Compressor Oil

    2WAY SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures 7-1. If Refrigerant Has Already Been Charged to Outdoor Unit Be sure to use an exclusive oil-charging tank for charging compressor oil. Prior to charging, carry out vacuum drying inside the tank and take care that no air (in the form of bubbles) is permitted to enter the tank. The oil charging procedures are given below.
  • Page 100 2WAY SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures Close Open Upper valve Manifold gauge Close Open Lower valve Vacuum pump Fig. 10 When the predetermined amount of oil has been charged into the oil-charging tank, immediately close the lower valve.
  • Page 101 2WAY SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures Low-pressure outlet port (for ø7.94mm-dia connector) High-pressure outlet port (for ø7.94mm-dia connector) Upper valve Manifold gauge Lower valve Gas tube service port (for ø7.94mm-dia connector) Liquid tube service port (for ø7.94mm-dia connector) Type 12HP Fig.
  • Page 102 2WAY SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures Low-pressure outlet port (for ø7.94mm-dia connector) High-pressure outlet port (for ø7.94mm-dia connector) Upper valve Manifold gauge Lower valve Gas tube service port (for ø7.94mm-dia connector) Liquid tube service port (for ø7.94mm-dia connector) Type 18HP / 20HP Fig.
  • Page 103 2WAY SYSTEM 2WAY SYSTEM 7. Charging Compressor Oil 7. Charging Compressor Oil Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures Next, follow the instructions in “4-2-1. Cooling operation (for all units)” at the outdoor unit where oil will be charged, and start cooling operation at all units.
  • Page 104 2WAY SYSTEM 2WAY SYSTEM 7. Charging Compressor Oil 7. Charging Compressor Oil Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures 7-2. If Outdoor Unit Has Not Been Charged with Refrigerant When a compressor has been replaced or in any other case where the outdoor unit has not been charged with refrigerant, first charge with refrigerant then follow the instructions in “7-1.

  • Page 105: Pumping Out Refrigerant From Outdoor Unit

    2WAY SYSTEM 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures For the method used for additional oil charging after compressor replacement, see the section “7-1. If Refrigerant Has Already Been Charged to Outdoor Unit.” Required equipment and tools: Jumper wire with clips, adjustable wrench, set of manifold gauge valves for the refrigerant R410A, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, flathead screwdriver, and outdoor unit maintenance remote controller.
  • Page 106 2WAY SYSTEM 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures 8-2. If Remote Controller is Not Available for Maintenance of Outdoor Unit (1) Connect the manifold gauge valves at the Lo-side to the low-pressure outlet port of the outdoor unit to be repaired.
  • Page 107 2WAY SYSTEM 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures (7) Short-circuit the AP pin (CN24) on the outdoor unit control PCB of the unit to be repaired. Then turn ON the outdoor unit power. When the AP pin (CN24) is short-circuited and the power is turned ON, all solenoid CAUTION valves in the outdoor unit are forced open, allowing the refrigerant to be recovered from all tubes which are separated by solenoid valves.

  • Page 108: Compressor

    Not present in model Compressor 1 [H03] (INV compressor) Compressor 2 U-8ME2E8, U-10ME2E8 [H13] (INV compressor) U-12ME2E8 A judgment is made based on factors that include the following: Coil resistance (varies depending on the compressor), insulation resistance, current, leakage breaker operation,...
  • Page 109 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9-2. Replacing the Compressor(s) 9-2-1. Replacing only the failed compressor (1) If backup operation is required, follow the instructions in “3. Backup Operation” and engage backup operation. (2) Follow the instructions in “9-3. Removing and Installing Compressor” and replace the failed compressor. (3) Fully close the high- and low-pressure gauge valves on the manifold gauge, then stop the vacuum pump.
  • Page 110 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9-2-2. Replacing all compressors in a failed unit (1) Follow the instructions in “2. Discharging Compressor Oil” and drain the oil from the oil separator in the failed unit. Measure the amount of drained oil. (2) If backup operation is required, follow the instructions in “3.
  • Page 111 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9-2-3. Replacing all compressors in a system (1) Follow the instructions in “2. Discharging Compressor Oil” and drain the oil from the oil separators in all out- door units. Measure the amount of drained oil. (2) Follow the instructions in “9-3.
  • Page 112 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9-2-4. Dry core cleaning If burning or other failures occur repeatedly at compressors within the same system, in many cases the cause is acid, sludge, carbon, or other substances that remain in the refrigeration cycle as the result of insufficient cleaning. If, when the oil is inspected, there is an outdoor unit where the oil color phase is 4.0 or higher, or where a sharp odor is present, carry out all steps below to perform dry core cleaning.
  • Page 113 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures (16) After evacuating all nitrogen gas from the tubing, apply vacuum to all outdoor units where dry cores were removed until the pressure is –101kPa {–755 mm Hg, 5 Torr} or less. (17) INSTALLATION: Refer to the Installation Instructions for further information.
  • Page 114 2WAY SYSTEM 2WAY SYSTEM 9. Compressor 9. Compressor Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures 9-3. Removing Compressors When removing and installing compressors, use sufficient caution to ensure that moisture or other substances do not enter the refrigerant tubing system. 9-3-1.

  • Page 115: Outdoor Unit Maintenance Remote Controller

    2WAY SYSTEM Contents Outdoor Unit Maintenance Remote Controller 4. OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER 1. Overview ............. . 4-2 2.

  • Page 116: Overview

    2WAY SYSTEM 1. Overview Outdoor Unit Maintenance Remote Controller OUTDOOR UNIT MAINTENANCE REMOTE [Service Checker Section] CONTROLLER (CZ-RTC4) for 2WAY VRF n About the outdoor unit maintenance remote controller The outdoor unit utilizes nonvolatile memory (EEPROM) on its PCB. This allows EEPROM data to replace the setting switches that were present on previous PCBs.

  • Page 117: Functions

    2WAY SYSTEM 2. Functions Outdoor Unit Maintenance Remote Controller n Functions on the ordinary display (1) Functions: Button operations can be used to perform the following functions. • Start/stop of all indoor units • Switching between cooling and heating • Test run of all indoor units •...

  • Page 118: Ordinary Display Controls And Functions

    2WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n Functions on the ordinary display • Connect the special service checker wiring to the outdoor unit PCB. The connection is shown in the figure below. Outdoor unit PCB When connecting the special service (3P, BLU) checker wiring to the remote controller...
  • Page 119 2WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller All units start/stop (Start/Stop operation) button can be used to start and stop all the indoor units. • The LED illuminates if any indoor units is operating. •...
  • Page 120 2WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n Display (functions) • Use the temperature setting buttons to change the item code. À Item code Á Item Remarks Outdoor unit alarm Alarm code display No. of connected indoor units Quantity Unit Nos.
  • Page 121 2WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller XX-YY R.C.  Locations where À Á , and  are displayed as Displays the outdoor unit sub-bus address which is shown in Fig. 1. currently selected. XX = Outdoor system address on main bus line (1 –...
  • Page 122 2WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n Concerning the 7-segment, 4-digit display remote controller timer display The unit Nos. of connected units are indicated by four 7-segment digits ( ) and a colon. Display of unit Nos.

  • Page 123: Monitoring Operations

    2WAY SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller Display the indoor unit and outdoor unit sensor temperatures. Press and hold the (Check) button and À buttons simultaneously for 4 seconds or longer to engage temperature monitor mode. During temperature monitoring, is illuminates.
  • Page 124 2WAY SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller Display of unit No. 1 (main unit) Description Remarks Indoor unit intake temp. (TA) °C Indoor unit heat exchanger temp. E1 (E1) °C — Indoor unit Indoor unit heat exchanger temp. E3 (E3) °C Discharge air temp.

  • Page 125: Outdoor Unit Alarm History Monitor

    2WAY SYSTEM 5. Outdoor Unit Alarm History Monitor Outdoor Unit Maintenance Remote Controller • Displays outdoor unit alarms only. • Check the indoor unit alarm histories separately using the indoor unit remote controllers or other control device. À Press and hold the (Check) button and button simultaneously for 4 seconds or longer to engage...

  • Page 126: Mode Settings

    2WAY SYSTEM 2WAY SYSTEM 6. Mode Settings 6. Mode Settings Outdoor Unit Maintenance Remote Controller Outdoor Unit Maintenance Remote Controller Display of fi rst 3 digits Setting mode 1 Press and hold the (Check) button and (Ventilation) button simultaneously for 4 seconds or longer.

  • Page 127: Remote Controller Functions

    2WAY SYSTEM Contents Remote Controller Functions 5. REMOTE CONTROLLER FUNCTIONS 1. Simple Settings Function ..........5-2 2.

  • Page 128: Simple Settings Function

    2WAY SYSTEM 1. Simple Settings Function Remote Controller Functions • This allows the filter lifetime, operating mode priority change, central control address, and other settings to be made for an individual or group- control indoor unit to which the remote controller 20:30 (THU) used for simple settings is connected.
  • Page 129 2WAY SYSTEM 1. Simple Settings Function Remote Controller Functions 1 Press and hold the buttons simultaneously for 4 seconds or longer. 2 “ ”, unit No. “ ” (or “ ” in the case ° of group control), item code “ ”, and settings °...
  • Page 130 2WAY SYSTEM 1. Simple Settings Function Remote Controller Functions List of Simple Setting Items Setting data Item code Item Description 0000 Not displayed 0001 150 hours 0002 2,500 hours Filter sign ON time (filter life time) 0003 5,000 hours 0004 10,000 hours 0005 Use the filter clogging sensor.
  • Page 131 2WAY SYSTEM 1. Simple Settings Function Remote Controller Functions Simple setting items Item code Item Description Filter sign ON time setting Changes the indoor unit filter lifetime when a high-performance filter or other (filter lifetime) optional product is installed. Reduces the filter sign ON time to 1/2 of the standard time (setting at the time of Degree of filter fouling shipping) for cases when filter fouling is more severe than normal.
  • Page 132 2WAY SYSTEM 1. Simple Settings Function Remote Controller Functions Item code Item Description Set when using a central control device. Central control address Used when setting the central control address manually from the remote controller. Operating mode priority change Note (1) NOTE (1) Explanation of operation mode priority change Enabled only in 2WAY System heat-pump models.
  • Page 133 2WAY SYSTEM 1. Simple Settings Function Remote Controller Functions When the operating mode at the priority remote controller is changed, the operating modes of other remote controllers change as shown below. Mode change at priority remote controller Operating modes at other remote controllers Current mode New mode Current mode...

  • Page 134: Detailed Settings Function

    2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions • This allows the system address, indoor unit address, and other settings to be made for the individual or group-control indoor unit to which the remote controller used for detailed settings is 20:30 (THU) connected.
  • Page 135 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions 1 Press and hold the buttons simultaneously for 4 seconds or longer. 2 “ ”, unit No. “ ”, item code “ ”, and ° settings data “ ”...
  • Page 136 2WAY SYSTEM 2WAY SYSTEM 2. Detailed Settings Function 2. Detailed Settings Function Remote Controller Functions Remote Controller Functions List of Detailed Setting Items Setting data Item code Item Description Description Description 0001 4-Way Cassette (60×60) (U1, Y2) 0002 2-Way Cassette (L1) 0003 1-Way Cassette (D1) Low Silhouette Ducted (F2)
  • Page 137 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description 0000 5 minutes (1B) Forced thermostat ON time 0001 4 minutes –010 Shifts discharge temperature setting 10°C down –009 Shifts discharge temperature setting 9°C down Cooling discharge –008 Shifts discharge temperature setting 8°C down...
  • Page 138 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description 0000 No forced operation 0001 Forced operation for 1 minute Automatic drain pump operation 0060 Continuous operation 0000 None Ventilation fan operation 0001 Ventilation fan operated by remote controller. Wired remote controller 0000 Not used.
  • Page 139 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description DC fan tap operating Purpose mode 0000 Standard Standard (setting at shipment) High ceiling use High ceiling setting 1 (with standard panel) 0001 For low Ultra long-life filter, oil guard panel, ammonia deodorizing static-pressure filter filter, optical regenerative deodorizing filter...
  • Page 140 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Item code Item Description Unit type Set when the indoor unit EEPROM memory is replaced during servicing. Indoor unit capacity System (outdoor unit) address These are not set at the time of shipping from the factory. Indoor unit address These must be set after installation if auto address setting is not performed.
  • Page 141 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Item code Item Description 1F (Upper limit) Cooling 20 (Lower limit) 21 (Upper limit) This setting changes the temperature range (upper limit and lower limit) Heating 22 (Lower limit) Change to the remote which is set from the remote controller or central control device.
  • Page 142 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions (Continued from previous page) Item code Item Description Heat exchanger temperature for The heat exchanger temperature control point for prevention of cold air cold air discharge discharge during heating operation can be changed. The indoor unit PCB optional output for the fan can be switched Fan output switching according to the purpose of use.
  • Page 143 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Selecting the DC fan motor tap (when setting with the remote controller) Table 1 Table of DC Fan Motor Tap Settings (4-Way Cassette type) Setting No. Remote controller setting data Contents & optional parts name 0000 Standard (setting at time of shipping) Air-blocking material (for 3-way air discharge)
  • Page 144 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions 3. Detailed Settings Function Stop the system before performing these steps. 1 Keep pressing the buttons simultaneously for 4 or more seconds. Detailed settings 20:30 (THU) The “Maintenance func” screen appears on the LCD display.
  • Page 145 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Stop the system before performing these steps. 1 Press and hold the b uttons simultaneously for 4 seconds or longer. 2 If group control is in effect, press the button to set.
  • Page 146 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Selecting the DC fan motor tap (when setting from the PCB) 4-Way Cassette type Stop the system before performing these steps. Open the electrical component box cover, then check the indoor unit control PCB. Connect the jumper connector (2P: yellow) which was supplied with the accessory to the correct connector pin on the indoor unit control PCB according to the setting number which was confirmed in Table 1 for DC Fan Motor Tap Settings.

  • Page 147: Remote Controller Servicing Functions

    2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions 2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions The remote controller includes a number of servicing functions. Use these as needed for test runs and inspections. Display of "maintenance function"...
  • Page 148 2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions List of Servicing Functions Functions Description Button operation Reset operation Unit status Operation with forced Press and hold the button for Test run 4 seconds or longer. thermostat ON Sensor Temperature display Press and hold the...
  • Page 149 2WAY SYSTEM 2WAY SYSTEM 3. Remote Controller Servicing Functions 3. Remote Controller Servicing Functions Remote Controller Functions Remote Controller Functions Test Run Function Operates the unit with the thermostat forced ON. 1 Keep pressing the 20:30 (THU) buttons simultaneously for 4 or more seconds.
  • Page 150 2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions 1 Press and hold the button for 4 seconds or longer. 2 “ ” appears on the remote controller LCD ° ° display. 3 Press the button to start the test run. •...
  • Page 151 2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions n Sensor Temperature Display Function (displayed regardless of whether unit is operating or stopped) Sensor info. 20:30 (THU) Unit no. Code no. Data The procedure below displays the sensor 0026 temperatures from the remote controller, indoor unit, 0028 and outdoor unit on the remote controller.
  • Page 152 2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions 1 Press and hold the buttons simultaneously for 4 seconds or longer. ” 2 The unit No. “X-X” (main unit No.), item code “ (sensor address), and servicing monitor “ ”...
  • Page 153 2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions Outdoor unit sensors Indoor unit sensors Unit No.1 Unit No.2 Unit No.3 Unit No.4 Room temp. controlled* Discharge temp. 1 (DISCH1) Remote controller temp. Discharge temp. 2 (DISCH2) High-pressure sensor temp. Indoor unit intake temp.
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  • Page 155: Trouble Diagnosis

    2WAY SYSTEM 2WAY SYSTEM Contents Contents Trouble Diagnosis Trouble Diagnosis 6. TROUBLE DIAGNOSIS 6. TROUBLE DIAGNOSIS 1. Contents of Remote Controller Switch Alarm Display ......6-2 2.
  • Page 156 1. Contents of Remote Controller 2WAY SYSTEM 1. Contents of Remote Controller 2WAY SYSTEM Trouble Diagnosis Switch Alarm Display Trouble Diagnosis Switch Alarm Display Blinking: OFF: Wired Wireless remote remote controller control receiver display display Possible cause of malfunction Serial Remote controller is detecting Error in receiving serial communication signal.

  • Page 157: Contents Of Remote Controller Switch Alarm Display

    1. Contents of Remote Controller 2WAY SYSTEM 1. Contents of Remote Controller 2WAY SYSTEM Trouble Diagnosis Switch Alarm Display Trouble Diagnosis Switch Alarm Display Blinking: OFF: Wired Wireless remote remote controller control receiver display display Possible cause of malfunction Thermistor fault Outdoor thermistor is either Compressor intake temp.

  • Page 158: Outdoor Unit Control Panel Led Display

    2WAY SYSTEM 2. Outdoor Unit Control Panel LED Display Trouble Diagnosis : ON : Blinking : OFF) LED (RED) Display meaning After the power is turned ON (and auto address setting is not in progress), no communication with the indoor units in that system is possible. (Both ON) After power is turned ON (and auto address setting is not in progress), one or more indoor units are confirmed in that system;...

  • Page 159: Way Alarm Codes

    2WAY SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis With types 8HP, 10HP and 12HP, only one INV compressor is supplied. With types 14HP and 16HP, two INV compressors are supplied. Alarm code Alarm meaning Page Outdoor unit receiving failure from indoor unit Prohibit starting auto address setting Auto address alarm (A small number of indoor units) Auto address alarm (A large number of indoor units)
  • Page 160 2WAY SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis Alarm code Alarm meaning Page Compressor 1 discharge temperature error 6-20 Actuation of high pressure switch 6-21 Compressor 1 open phase detection 6-22 Compressor 2 open phase detection 6-22 6-23 Actuation of O sensor Compressor 1 secondary overcurrent 6-23...

  • Page 161: Way Alarm Codes

    2WAY SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis E06 Alarm Alarm code Alarm meaning Outdoor unit failed to receive serial communication signals from indoor unit. Alarm conditions Outdoor unit failed to receive serial communication signals from indoor unit. Probable cause (1) The indoor unit power was cut OFF after initial communications were completed.
  • Page 162 2WAY SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis E16 Alarm Alarm code Alarm meaning Auto address setting alarm (too many units) Alarm conditions • The number of indoor units was too many when auto address setting was performed. • After initial communications were completed, an unrecognized unit was detected. Probable cause (1) The number of indoor units set at the indoor unit quantity setting SW (SW3, SW4) on the Outdoor Unit Control PCB is less than the number set.
  • Page 163 2WAY SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis E25 Alarm Alarm code Alarm meaning Outdoor unit address setting failure (duplication) Alarm conditions Communication by outdoor unit main-sub control wiring was received that contained the same address as that unit 5 times or more within 3 minutes. Probable cause The unit number is set incorrectly.
  • Page 164 2WAY SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis F04, F05 Alarm Alarm code F04, F05 Alarm meaning F04: Compressor 1 discharge temperature sensor trouble F05: Compressor 2 discharge temperature sensor trouble Alarm conditions (1) Discharge temp. of 100°C or higher was detected 30 minutes or more after that compressor stopped operating.
  • Page 165 2WAY SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis Check (3) Leakage from the discharge tube check valve Trouble: Although the other compressor is operating and this compressor is stopped, the discharge temperature of this compressor rises together with the temperature of the other compressor.
  • Page 166 2WAY SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis F08 Alarm Alarm code Alarm meaning Outdoor air temperature sensor trouble Alarm conditions (1) Short circuit (A/D step is 10 steps or less) (2) Open circuit (A/D step is 1014 steps or more) Probable cause (1) Sensor malfunction (including connector) (2) The Outdoor Unit Control PCB malfunction...
  • Page 167 3WAY SYSTEM 2WAY SYSTEM 3. 2WAY Alarm Codes 4. 3WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis F16 Alarm Alarm code Alarm meaning High-pressure sensor malfunction Alarm conditions High-pressure sensor disconnected or open circuit High-pressure sensor detected over 3.6MPa (In case of renewal setting : 3.15MPa) continuously for 30 minutes while outdoor units stopped.
  • Page 168 2WAY SYSTEM 2WAY SYSTEM 4. 2WAY Alarm Codes 3. 2WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis F17 Alarm Alarm code Alarm meaning Low-pressure sensor trouble Alarm conditions (1) Sensor short circuit (2) Sensor open circuit Probable cause (1) Sensor malfunction (including connector) (2) The Outdoor Unit Control PCB malfunction Check (1) Measure the sensor resistance.
  • Page 169 2WAY SYSTEM 2WAY SYSTEM 4. 2WAY Alarm Codes 3. 2WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis H03, H13 Alarm Alarm code H03, H13 Alarm meaning H03 : Compressor 1 CT sensor disconnected or short-circuit H13 : Compressor 2 CT sensor disconnected or short-circuit Alarm conditions Compressor 1, 2: When the frequency of compressor (INV) is over 35Hz and the secondary current is over 7.0A, the primary current detected lower than 0.7A.
  • Page 170 2WAY SYSTEM 3WAY SYSTEM 3. 2WAY Alarm Codes 4. 3WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis H06 Alarm Alarm code Alarm meaning Abnormal decrease of low-pressure Alarm conditions • Low-pressure sensor detects lower than 0.06MPa continuously for 2 minutes or lower than 0.02MPa for just a moment.
  • Page 171 2WAY SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis H07 Alarm Alarm code Alarm meaning Low oil alarm Alarm conditions This alarm occurs when oil does not flow for a specified amount of time in tubing where oil flow constantly. (The presence of oil is detected by a temperature sensor.) Probable cause Insufficient amount of oil in the system (1) The length of system tubing exceeds the allowable tubing length.
  • Page 172 2WAY SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis H21, H31 Alarm Alarm code H21, H31 Alarm meaning H21 : Compressor 2 HIC trouble alarm H31 : Compressor 1 HIC trouble alarm Alarm conditions This alarm occurs when the microcomputer identifies a trouble signal (indicating abnormal HIC temperature or other trouble) from the HIC.
  • Page 173 2WAY SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis L04 Alarm Alarm code Alarm meaning Outdoor system address duplication Alarm conditions Communication by inter-unit control wiring was received that contained the same address as that unit 5 times or more within 3 minutes. Probable cause Incorrect outdoor system address settings Check...
  • Page 174 2WAY SYSTEM 2WAY SYSTEM 4. 2WAY Alarm Codes 3. 2WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis P03, P17 Alarm Alarm code P03, P17 Alarm meaning P03 : Compressor 1 discharge temperature trouble P17 : Compressor 2 discharge temperature trouble Alarm conditions Compressor 1 : Pre-trip stops when the temperature exceeds 106°C.
  • Page 175 3WAY SYSTEM 2WAY SYSTEM 4. 3WAY Alarm Codes 3. 2WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis P04 Alarm Alarm code Alarm meaning High-pressure switch activated. Alarm conditions The operation of the electronic circuit in the high-pressure switch may short-circuit the terminal depending on the pressure.
  • Page 176 (14) Check whether the wiring from the solenoid valve kit is actually connected to the different indoor unit. 2WAY SYSTEM (15) The system is that the multiple indoor units are connected at only one solenoid valve kit and also multiple 3.
  • Page 177 2WAY SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis P14 Alarm Alarm code Alarm meaning sensor operation It is judged an error whenever the outdoor unit receives the signal “O Alarm Generated” from the Alarm conditions indoor unit. With the indoor unit's EEPROM setting (item code 0B) set to 0001, the EXCT input was shorted. Probable cause —...
  • Page 178 2WAY SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis P20 Alarm Alarm code Alarm meaning High load alarm Alarm conditions The high pressure increase is not rapid but the alarm occurs when the horsepower down does not meet the anticipated time. Probable cause (1) Forgot to open the valve.
  • Page 179 2WAY SYSTEM 2WAY SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis P19, P29 Alarm Alarm code P19, P29 Alarm meaning P19 : Compressor 2 start failure (compressor lock, compressor wiring open phase, DCCT failure) P29 : Compressor 1 start failure (compressor lock, compressor wiring open phase, DCCT failure) Alarm conditions This alarm may occur at start, and occurs when open phase or lock is detected, and when a DCCT failure occurs.

  • Page 180: Blinking Inspection Display

    WARNING 2WAY SYSTEM 4. Blinking Inspection Display Trouble Diagnosis Currently the blinking inspection display can be displayed only on the wired remote controller CAUTION and system remote controller. Blinking inspection display (Automatic backup) Alarm code (Blinking inspection display) Alarm meaning Automatic backup is in progress.

  • Page 181: Inspection And Characteristics Of Parts

    2WAY SYSTEM 5. Inspection and Characteristics of Parts Trouble Diagnosis (1) High-Pressure Switch (63PH1, 63PH2) 63PH1 Disconnect the CN69 connector (3P, white) from the outdoor unit control panel. Measure the resistance between socket pins 1 and 3. 63PH2 The resistance is OK if the result is 0 Ω. (2) Electronic Control Valve (MOV1, MOV2, MOV4) After removing the connector from the PCB, use the following methods to check the valves.
  • Page 182 2WAY SYSTEM 2WAY VRF SYSTEM 5. Inspection and Characteristics of Parts 8. Thermister Characteristics Curve Trouble Diagnosis Trouble Diagnosis (4) Indoor suction air (room) temp. sensor (TA) Indoor discharge air temp. sensor (BL) Temperature (˚C) (5) Indoor coil temp. sensor (E1, E3) Temperature (˚C) Temperature (˚C) 6 - 28...
  • Page 183 2WAY SYSTEM 2WAY SYSTEM 6. Inspection and Characteristics of Parts 5. Inspection and Characteristics of Parts Trouble Diagnosis Trouble Diagnosis (6) Coil Resistance of Outdoor Unit Fan Motor unit : ohm DMSBG75SY Outdoor Unit Type 10HP 12HP 14HP 16HP 18HP 20HP U - V Resistance...

  • Page 184: Test Pin

    2WAY SYSTEM 2WAY SYSTEM 7. Test Pin 6. Test Pin Trouble Diagnosis Trouble Diagnosis When the test pin on the outdoor unit control PCB is short-circuited, each part can be operated individually. • After turning OFF the main unit power, short-circuit the test pin (CN22, black), then turn the power back ON. Output is performed in the sequence shown in the table below, for 0.5 seconds each.

  • Page 185: Symptom: Thermostat In Off Continues Or Cycles Off & On Too Frequently

    Mini VRF SYSTEM 6. Symptom: Thermostat in OFF continues or 7. Symptom: Thermostat in OFF continues or 2WAY SYSTEM Trouble Diagnosis cycles OFF & ON too frequently Trouble Diagnosis cycles OFF & ON too frequently How to detect abnormality • Abnormality does not occur.
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  • Page 187: Test Run

    2WAY SYSTEM Contents Test Run 7. TEST RUN 1. Preparing for Test Run ..........7-2 2.

  • Page 188: Preparing For Test Run

    2WAY SYSTEM 1. Preparing for Test Run Test Run (6) Both the gas and liquid tube service valves are open. If 1. Preparing for Test Run not, open them now. Before attempting to start the air conditioner, check the following. (1) All loose matter is removed from the cabinet especially steel filings, bits of wire, and clips.

  • Page 189: Test Run Procedure

    2WAY SYSTEM 2. Test Run Procedure Test Run Test Run Procedure Notes: Recheck before the test run. 1. Use caution when making the settings. If there are duplicated system addresses, or if the settings for the number of indoor units are not Have outdoor sub units been connected? consistent, an alarm will occur and the system will not start.

  • Page 190: Main Outdoor Unit Pcb Setting

    2WAY SYSTEM 3. Main Outdoor Unit PCB Setting Test Run 3. Main Outdoor Unit PCB Setting CN73 CN82 CN69 CN67 JP12 JP11 CN22 CN27 LED1 CN23 CN28 LED2 CN24 CN30 CN40 CN25 CN33 CN34...
  • Page 191 2WAY SYSTEM 3. Main Outdoor Unit PCB Setting Test Run Examples of the No. of indoor units settings (SW4, SW3) Indoor unit setting (SW4) Indoor unit setting (SW3) No. of indoor units (3P DIP switch) (Rotary switch) 10 20 30 1 unit (factory setting) All OFF Set to 1...
  • Page 192 2WAY SYSTEM 3. Main Outdoor Unit PCB Setting Test Run CN33 CN34 LED1 LED2 JP11 JP12 CN25 CN67 CN69 CN82 CN73 CN22 CN23 CN24 CN28 CN30 CN40 CN27 Name And Function Of Each Switch On Outdoor Unit Control P.C. Board Function Switch Remarks Changes to cooling/heating mode.

  • Page 193: Auto Address Setting

    2WAY SYSTEM 4. Auto Address Setting Test Run 4. Auto Address Setting Example: Basic Wiring Diagram (1) • Case of no link wiring 3P terminating (Inter-unit control wiring is not connected to a multiple system.) resistance pin Indoor unit address setting is possible without starting the compressor. (SHORT side) Unit 1 setting (outdoor main unit) * It is not necessary to control the terminating...
  • Page 194 2WAY SYSTEM 4. Auto Address Setting Test Run Example: Basic Wiring Diagram (2) • Case of link wiring * See the section “ATTENTION!”. Setting of terminal pin (CN67) No. 1 refrigerant system Refrigerant circuit No. 1 Unit No. 1 (Main) : short-circuit (at shipment) Unit 1 setting (outdoor main unit) Unit No.
  • Page 195 2WAY SYSTEM 4. Auto Address Setting Test Run Between conductors Final check before operation Wire Final check must be done under the conditions of inter-outdoor unit control wiring connected to the centralized control system and the resistor between conductors must be measured by a Megger.
  • Page 196 2WAY SYSTEM 4. Auto Address Setting Test Run Auto Address Setting in Heating Mode Case 3.a In case of impossibility of turning ON power to indoor/outdoor units in each refrigerant system: Indoor unit auto address setting cannot be made unless the compressor is started. How to Control Auto Address from Outdoor Unit Case 2 1.
  • Page 197 2WAY SYSTEM 4. Auto Address Setting 4. Auto Address Setting Test Run Case 3.b Auto Address Setting in Cooling Mode In case of impossibility of turning ON power to indoor/outdoor units in each refrigerant system: The indoor unit auto address setting cannot be made unless the compressor is started. How to Control Auto Address from Outdoor Unit 1.
  • Page 198 2WAY SYSTEM 4. Auto Address Setting Test Run Auto Address Setting from the High-spec Wired Remote Controller (CZ-RTC5A) 1 Keep pressing the buttons simultaneously for 4 or more seconds. The “Maintenance func” screen appears on the LCD display. 2 Press the button to see each menu.
  • Page 199 2WAY SYSTEM 4. Auto Address Setting Test Run Display During Auto Address Setting On the surface of outdoor unit control P.C. board * Do not short circuit the A.ADD pin (CN30) again during auto address setting. LEDs 1 and 2 go out and address setting is interrupted. * When auto address setting is normally completed, both LEDs 1 and 2 go out.
  • Page 200 to the remote controller. Check that the fan of that indoor unit starts 2WAY SYSTEM and that air is discharged. 4. Auto Address Setting Indoor unit address Number changes to Test Run indicate which indoor Press the button again and check the address of each indoor unit is currently selected.

  • Page 201: Remote Controller Test Run Settings

    2WAY SYSTEM 5. Remote Controller Test Run Settings Test Run 5. Remote Controller Test Run Settings CZ-RTC5A (High-spec wired remote controller) 20:30 (THU) 1 Keep pressing the buttons simultaneously for 4 or more seconds. The “Maintenance func” screen appears on the LCD display. START Maintenance func 20:30 (THU)

  • Page 202: Caution For Pump Down

    6. Caution for Pump Down 2WAY SYSTEM Test Run 7. Self-Diagnosis Function Table and Contents of Alarm Display 6. Caution for Pump Down Pump down means refrigerant gas in the system is returned to the outdoor unit. Pump down is used when the unit is to be moved, or before servicing the refrigerant circuit. (See the Section 3) This outdoor unit cannot collect more than the rated refrigerant amount as shown by the nameplate on the back.
  • Page 203 2WAY SYSTEM 7. Self-Diagnosis Function Table and Contents of Alarm Display Test Run • If the alarm display “E15”, “E16” and “E20” appear after auto address setting began, check the following items. Alarm display Alarm contents Recognized number of indoor units at the time of auto address setting are fewer than that of indoor units set by SW3 and SW4 on outdoor main unit P.C.
  • Page 204 2WAY SYSTEM 7. Self-Diagnosis Function Table and Contents of Alarm Display Test Run Remote control display Alarm contents No indoor unit during auto address setting Receiving failure of main system from sub system when link wiring is used for outdoor units Receiving failure of sub system from main system when link wiring is used for outdoor units Receiving failure of relay control unit from outdoor unit(s) Failure of outdoor unit address setting (Duplicative)
  • Page 205 2WAY SYSTEM 7. Self-Diagnosis Function Table and Contents of Alarm Display Test Run • Contents of alarm display on remote controller For the remote controller, there are other alarm contents listed on the following table besides the alarm display on outdoor main unit control P.C.
  • Page 206 2WAY SYSTEM 7. Self-Diagnosis Function Table and Contents of Alarm Display Test Run ATTENTION! Adjustment of terminating resistance (pin) is necessary. Communication failure will occur unless adjustment is made correctly. • Terminating resistance (pin) is mounted on outdoor unit control P.C. board. •...
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