Panasonic U-8ME1E81 Service Manual
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Panasonic U-8ME1E81 Service Manual

2way vrf system
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Test Run SERVICE MANUAL
Model No.
Outdoor Unit
Class
8HP
ME1
Model Name
U-8ME1E81
Indoor Unit
Class
15
U1
Y1
4-Way Cassette 60×60
Y2
4-Way Cassette 60×60
L1
2-Way Cassette
D1
Low Silhouette Ducted
F1
Low Silhouette Ducted
F2
Slim Low Static Ducted
S-15MM1E5
M1
T1
Wall Mounted
K1
K2
Wall Mounted
Concealed Floor
R1
Standing
P1
Floor Standing
Class
73
High Static Pressure
S-73ME1E5
E1
Ducted
85464849305004
10HP
12HP
14HP
U-10ME1E81
U-12ME1E81
U-14ME1E81
22
28
36
S-22MU1E51
S-28MU1E51
S-36MU1E51
S-22MU1E5
S-28MU1E5
S-36MU1E5
S-22MY1E5
S-28MY1E5
S-36MY1E5
S-22MY2E5
S-28MY2E5
S-36MY2E5
S-22ML1E5
S-28ML1E5
S-36ML1E5
S-28MD1E5
S-36MD1E5
S-22MF1E5
S-28MF1E5
S-36MF1E5
S-22MF2E5
S-28MF2E5
S-36MF2E5
S-22MM1E5
S-28MM1E5
S-36MM1E5
S-36MT1E5
S-22MK1E5
S-28MK1E5
S-36MK1E5
S-22MK2E5
S-28MK2E5
S-36MK2E5
S-22MR1E5
S-28MR1E5
S-36MR1E5
S-22MP1E5
S-28MP1E5
S-36MP1E5
106
140
224
S-106ME1E5 S-140ME1E5 S-224ME1E5
S-224ME1E5A
2WAY VRF SYSTEM
16HP
18HP
20HP
U-16ME1E81
U-18ME1E81
U-20ME1E81
45
56
60
S-45MU1E51
S-56MU1E51
S-60MU1E51
S-45MU1E5
S-56MU1E5
S-45MY1E5
S-56MY1E5
S-45MY2E5
S-56MY2E5
S-45ML1E5
S-56ML1E5
S-45MD1E5
S-56MD1E5
S-45MF1E5
S-56MF1E5
S-45MF2E5
S-56MF2E5
S-60MF2E5
S-45MM1E5
S-56MM1E5
S-45MT1E5
S-56MT1E5
S-45MK1E5
S-56MK1E5
S-45MR1E5
S-56MR1E5
S-45MP1E5
S-56MP1E5
280
S-280ME1E5
Order No. SBPAC1307003CE
73
90
106
S-73MU1E51
S-90MU1E51
S-106MU1E51
S-73MU1E5
S-106MU1E5
S-73ML1E5
S-73MD1E5
S-73MF1E5
S-90MF1E5
S-106MF1E5
S-73MF2E5
S-90MF2E5
S-106MF2E5
S-73MT1E5
S-106MT1E5
S-73MK1E5
S-106MK1E5
S-71MR1E5
S-71MP1E5
REFERENCE NO.
140
160
S-140MU1E51
S-160MU1E51
S-140MU1E5
S-160MU1E5
S-140MF1E5
S-160MF1E5
S-140MF2E5
S-160MF2E5
S-140MT1E5
SM830205-04
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  • Page 1 Order No. SBPAC1307003CE TEST RUN SERVICE MANUAL 2WAY VRF SYSTEM Model No. Outdoor Unit Class 10HP 12HP 14HP 16HP 18HP 20HP Model Name U-8ME1E81 U-10ME1E81 U-12ME1E81 U-14ME1E81 U-16ME1E81 U-18ME1E81 U-20ME1E81 Indoor Unit Class S-22MU1E51 S-28MU1E51 S-36MU1E51 S-45MU1E51 S-56MU1E51 S-60MU1E51 S-73MU1E51...
  • Page 2 This product is intended for professional use. THIS SYSTEM. Permission from the power supplier is required when installing the U-8ME1E81 outdoor unit that is connected to a 16 A distribution network. • Do not supply power to the unit until all...
  • Page 3 When Transporting When Connecting Refrigerant Tubing Be careful when picking up and moving WARNING the indoor and outdoor units. Get a partner to help, and bend your knees • When performing piping work do when lifting to reduce strain on your back. not mix air except for specified Sharp edges or thin aluminum fins on the refrigerant (R410A) in refrigeration...
  • Page 4 When Servicing Others • Turn the power OFF at the main CAUTION power box (mains), wait at least • Do not touch the air inlet or 10 minutes until it is discharged, the sharp aluminum fins of then open the unit to check or repair the outdoor unit.
  • Page 5 Check of Density Limit The standards for minimum room volume are as follows. (1) No partition (shaded portion) The room in which the air conditioner is to be installed requires a design that in the event of refrigerant gas leaking out, its density will not exceed a set limit. The refrigerant (R410A), which is used in the air conditioner, is safe, without the toxicity or combustibility of ammonia, and is not restricted by laws imposed to protect the ozone layer.
  • Page 6 Precautions for Installation Using New Refrigerant 1. Care regarding tubing 1-1. Process tubing ● Material: Use C1220 phosphorous deoxidized copper specified in JIS H3300 “Copper and Copper Alloy Seamless Pipes and Tubes.” For tubes of ø22.22 or larger, use C1220 T-1/2H material or H material, and do not bend the tubes. ●...

  • Page 7: Table Of Contents

    Contents 1. Address Settings (Outdoor Units) ........................1-1 1. Test Run ....................... 2. Settings of Indoor Unit Control PCB ..............3. Auto Address Setting ................... 2. Remote Controller Functions .................... 2-1 1. Remote Controller Test Run Settings ..............2. Simple Settings Function ..................3.
  • Page 8 – MEMO –...
  • Page 9 2WAY SYSTEM Address Settings Contents 1. Address Settings (Outdoor Units) 1. Test Run ..........................1-2 2. Settings of Indoor Unit Control PCB .................1-3 3. Auto Address Setting ......................1-5...

  • Page 10: Test Run

    2WAY SYSTEM Address Settings 1. Test Run Test Run Procedure Items to Check Before the Test Run Turn the remote power switch on at least 5 hours before the test, in order to energize the Recheck the items to check before the test run. crankcase heater.

  • Page 11: Settings Of Indoor Unit Control Pcb

    2WAY SYSTEM Address Settings 2. Settings of Indoor Unit Control PCB 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, blue) (Rotary switch, red) 10 20 30 s t i s t i...
  • Page 12 2WAY SYSTEM 2WAY SYSTEM Address Settings Address Settings 2. Settings of Indoor Unit Control PCB 2. Settings of Indoor Unit Control PCB LED2 LED1 CN40 CN22 CN23 CN73 CN24 CN67 CN27 CN30 CN28 CN34 CN33 Name And Function Of Each Switch On Outdoor Unit Control PC Board •...

  • Page 13: Auto Address Setting

    2WAY SYSTEM Address Settings 3. Auto Address Setting Auto Address Setting Basic wiring diagram: Example (1) • If link wiring is not used (The inter-unit control wirings are not connected to multiple refrigerant systems.) Indoor unit addresses can be set without operating the compressors. No.
  • Page 14 2WAY SYSTEM Address Settings 3. Auto Address Setting Basic wiring diagram: Example (2) • If link wiring is used * See the section “Adjustment of Termination Resistor (Plug)”. No. 1 Refrigerant circuit No. 1 (main outdoor unit) settings System address No.
  • Page 15 2WAY SYSTEM Address Settings 3. Auto Address Setting Case 2 Automatic Address Setting (no compressor operation) Indoor and outdoor unit power can be turned ON for each system separately. Indoor unit addresses can be set without operating the compressors. Automatic Address Setting from Outdoor Unit On the No.
  • Page 16 2WAY SYSTEM 2WAY SYSTEM Address Settings Address Settings 3. Auto Address Setting 3. Auto Address Setting Case 3A Automatic Address Setting in Heating Mode Indoor and outdoor unit power cannot be turned ON for each system separately. In the following, automatic setting of indoor unit addresses is not possible if the compressors are not operating. Therefore perform this process only after completing all refrigerant tubing work.
  • Page 17 2WAY SYSTEM 2WAY SYSTEM Address Settings Address Settings 3. Auto Address Setting 3. Auto Address Setting Case 3B Automatic Address Setting in Cooling Mode Indoor and outdoor unit power cannot be turned ON for each system separately. In the following, automatic setting of indoor unit addresses is not possible if the compressors are not operating. Therefore perform this process only after completing all refrigerant tubing work.
  • Page 18 2WAY SYSTEM 3WAY SYSTEM Address Settings 3. Auto Address Setting Address Settings 3. Auto Address Setting Adjustment of Termination Resistor (Plug) Communication error will occur if improper adjustment is made. • When connecting the centralized control system, it is necessary to adjust the termination resistor (terminal plug: CN67). Even if no connection is made, confirmation is required for VRF systems.
  • Page 19 2WAY SYSTEM 3WAY SYSTEM Address Settings 3. Auto Address Setting Address Settings 3. Auto Address Setting If link wiring is used Short-circuit 2 termination resistors plug (remains unchanged at shipment). In order to stabilize communication, 2 short circuit locations shall be at both sides (remains unchanged at shipment). Setting of terminal plug (CN67) Refrigerant circuit No.
  • Page 20 2WAY SYSTEM Address Settings 3. Auto Address Setting Display during automatic address setting On outdoor main unit PCB * Do not short-circuit the automatic address setting pin (CN030) again while automatic address setting is in progress. Doing so will cancel the setting operation and will cause LEDs 1 and 2 to turn OFF.
  • Page 21 2WAY SYSTEM 2WAY SYSTEM Address Settings Address Settings 3. Auto Address Setting 3. Auto Address Setting Automatic Address Setting* from the Remote Controller * Automatic address setting in cooling mode cannot be done from the remote controller. Selecting each refrigerant system individually for automatic address setting ---Automatic address setting for each system: Item code “A1”...
  • Page 22 2WAY SYSTEM 2WAY SYSTEM Address Settings Address Settings 3. Auto Address Setting 3. Auto Address Setting Request concerning recording the indoor/outdoor unit combination Nos. After automatic address setting has been completed, be sure to record them for future reference. List the outdoor main unit system address and the addresses of the indoor units in that system in an easily visible location (next to the nameplate), using a permanent marking pen or similar means that cannot be abraded easily.

  • Page 23: Remote Controller Functions

    2WAY SYSTEM Remote Controller Functions Contents 2. Remote Controller Functions 1. Remote Controller Test Run Settings ................2-2 2. Simple Settings Function....................2-3 3. Detailed Settings Function ....................2-7 4. Remote Controller Servicing Functions .................2-22...

  • Page 24: Remote Controller Test Run Settings

    2WAY SYSTEM 2WAY SYSTEM Remote Controller Functions Remote Controller Functions 1. Remote Controller Test Run Settings 1. Remote Controller Test Run Settings Wired Remote Controller Test Run Settings 1. Press the remote controller button for 4 seconds or longer. 2.

  • Page 25: Simple Settings Function

    2WAY SYSTEM Remote Controller Functions 2. Simple Settings Function 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 used for simple settings is connected.
  • Page 26 2WAY SYSTEM Remote Controller Functions 2. Simple Settings Function 20:30 (THU) START CZ-RTC3 Fig. 2-2 Select the “Code no.” by pressing the button. Change the “Code no.” by pressing the Keep pressing the button. buttons simultaneously for 4 or more seconds. The “Maintenance func”...
  • Page 27 2WAY SYSTEM Remote Controller Functions 2. Simple Settings Function List of Simple Setting Items Setting data Item code Item Description 0000 Not displayed 0001 150 hours Filter sign ON time 0002 2,500 hours (filter life time) 0003 5,000 hours 0004 10,000 hours 0005 Use the filter clogging sensor.
  • Page 28 2WAY SYSTEM Remote Controller Functions 2. Simple Settings Function 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 29: Detailed Settings Function

    2WAY SYSTEM Remote Controller Functions 3. Detailed Settings Function 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 connected.
  • Page 30 2WAY SYSTEM Remote Controller Functions 3. Detailed Settings Function Setting the Flap Separately (When setting the CZ-RTC2) Press the timer time buttons to select 1) The 4-air outlet flap can be adjusted separately during the desired setting data. operation. When not adjusted separately, all flaps operate Flap position in the same manner.
  • Page 31 2WAY SYSTEM Remote Controller Functions 3. Detailed Settings Function 20:30 (THU) START CZ-RTC3 Select the “Code no.” by pressing the Fig. 2-5 button. Change the “Code no.” by pressing the Keep pressing the button (or keeping it pressed). buttons simultaneously for 4 or more seconds.
  • Page 32 2WAY SYSTEM 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Remote Controller Functions 3. Detailed Settings Function List of Detailed Setting Items Setting data Item code Item Description Description Description 0001 4-Way Cassette (60×60) (U1, Y1, Y2) 0002 2-Way Cassette (L1) 0003 1-Way Cassette (D1) Low Silhouette Ducted (F1, F2)
  • Page 33 2WAY SYSTEM Remote Controller Functions 3. Detailed Settings Function Setting data Item Item code Description 0000 0000 5 minutes Forced thermostat ON (1B) time 0001 4 minutes Shifts discharge temperature setting 10°C down. Shifts discharge temperature setting 9°C down. Cooling discharge Shifts discharge temperature setting 8°C down.
  • Page 34 2WAY SYSTEM Remote Controller Functions 3. Detailed Settings Function Setting data Item Item code Description 0000 No forced operation 0001 Forced operation for 1 minute Automatic drain pump operation 0060 Continuous operation None 0000 Ventilation fan operation 0001 Ventilation fan operated by remote controller. 0000 Not used.
  • Page 35 2WAY SYSTEM Remote Controller Functions 3. Detailed Settings Function Setting data Item Item code DC fan tap Purpose operating mode 0000 Standard Standard (setting at time of shipping) High ceiling use High ceiling setting 1 (with standard panel) For low Ultra long-life filter, oil guard panel, ammonia Fan tap setting 0001...
  • Page 36 2WAY SYSTEM Remote Controller Functions 3. Detailed Settings Function Selecting the DC fan motor tap (when setting with the remote controller) Stop the system before performing these steps. Press and hold the buttons simultaneously for 4 seconds or longer. If group control is in effect, press the button and select the address (unit No.) of the indoor unit to set.
  • Page 37 2WAY SYSTEM Remote Controller Functions 3. Detailed Settings Function 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 38 2WAY SYSTEM 2WAY SYSTEM Remote Controller Functions Remote Controller Functions 3. Detailed Settings Function 3. Detailed Settings Function Selecting the DC fan motor tap (when setting from the PCB) 4-Way Cassette Stop the system before performing these steps. Open the electrical component box cover, then check the indoor unit control PCB. (Fig. 2-7) 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 39 2WAY SYSTEM Remote Controller Functions 3. Detailed Settings Function Selecting the DC fan motor tap (When setting from the PCB) Low Silhouette Ducted Type (Type F2) Turn off the power breaker to halt the supply of electricity to the PC board.
  • Page 40 2WAY SYSTEM 2WAY SYSTEM Remote Controller Functions Remote Controller Functions 3. Detailed Settings Function 3. Detailed Settings Function Low Silhouette Ducted Type (Type F2) Table of setting the external static pressure Operating the Remote Controller Indoor unit Item code 15, 22, 28, 36, 45, ...
  • Page 41 2WAY SYSTEM 2WAY SYSTEM Remote Controller Functions Remote Controller Functions 3. Detailed Settings Function 3. Detailed Settings Function Detailed settings 20:30 (THU) Unit no. Code no. Set data 20:30 (THU) Sel. Next 4. Select the “Set data” by pressing the START button.
  • Page 42 2WAY SYSTEM Remote Controller Functions 3. Detailed Settings Function Auto External Static Pressure Setting Operation Press the button. Test run will be started. Test run setting mode screen appears on the LCD display. Keep pressing the buttons simultaneously for 4 or more seconds. 20:30 (THU) The “Maintenance func”...
  • Page 43 2WAY SYSTEM Remote Controller Functions 3. Detailed Settings Function Selecting cooling discharge temperature for only Type K2 (Using with the timer remote controller) In order to prevent dew condensation or dewdrops during cooling or drying operation, the setting of the discharge temperature can be set no lower than temperature needed. If the installation is in a fear of high humidity area (over 80% humidity), install the indoor unit in the following procedure.

  • Page 44: Remote Controller Servicing Functions

    2WAY SYSTEM 2WAY SYSTEM Remote Controller Functions Remote Controller Functions 4. Remote Controller Servicing Functions 4. Remote Controller Servicing Functions CZ-RTC2 List of Servicing Functions Function Description Button operations Reset operation Unit status Operation with Press and hold the button forced thermostat Test run...
  • Page 45 2WAY SYSTEM 2WAY SYSTEM Remote Controller Functions Remote Controller Functions 4. Remote Controller Servicing Functions 4. Remote Controller Servicing Functions Display of "maintenance function" screen 1 Keep pressing the Maintenance func 20:30 (THU) buttons simultaneously for 4 or more seconds. 1.
  • Page 46 2WAY SYSTEM Remote Controller Functions 2WAY SYSTEM 3. Remote Controller Servicing Functions 4. Remote Controller Servicing Functions Remote Controller Functions Test Run Function Operates the unit with the thermostat forced ON. Press and hold the button for 4 seconds or longer.
  • Page 47 2WAY SYSTEM 2WAY SYSTEM Remote Controller Functions Remote Controller Functions 4. Remote Controller Servicing Functions 4. Remote Controller Servicing Functions Sensor Temperature Display Function (displayed regardless of whether unit is operating or stopped) The procedure below displays the sensor temperatures from the remote controller, indoor unit, and outdoor unit on the remote controller.
  • Page 48 2WAY SYSTEM Remote Controller Functions 2WAY SYSTEM 3. Remote Controller Servicing Functions 4. Remote Controller Servicing Functions Remote Controller Functions 1 Keep pressing the buttons simultaneously for 4 or more seconds. The “Maintenance func” screen appears on the Sensor info.
  • Page 49 2WAY SYSTEM 2WAY SYSTEM Remote Controller Functions Remote Controller Functions 4. Remote Controller Servicing Functions 4. Remote Controller Servicing Functions Indoor unit sensors Outdoor unit sensors Unit No.1 Unit No.2 Unit No.3 Room temp. controlled* Discharge temp. 1 (DISCH1) Remote controller temp. Discharge temp.
  • Page 50 – MEMO – 2-28...

  • Page 51: Trouble Diagnosis

    2WAY SYSTEM Trouble Diagnosis Contents 3. Trouble Diagnosis 1. Contents of Remote Controller Switch Alarm Display ............3-2 2. Outdoor Unit Control Panel LED Display .................3-4 3. Remote Controller Servicing Functions ................3-5 4. 2WAY Alarm Codes ......................3-8 5. Blinking Inspection Display .....................3-29 6.

  • Page 52: Contents Of Remote Controller Switch Alarm Display

    2WAY SYSTEM 1. Contents of Remote Controller 2WAY SYSTEM Trouble Diagnosis Trouble Diagnosis Switch Alarm Display 1. Contents of Remote Controller 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 53 2WAY SYSTEM Trouble Diagnosis 1. Contents of Remote Controller 2WAY SYSTEM 1. Contents of Remote Controller 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 54: Outdoor Unit Control Panel Led Display

    2WAY SYSTEM Trouble Diagnosis 2. Outdoor Unit Control Panel LED Display : ON : Blinking : OFF) LED (RED) Display meaning After the power is turned ON (and automatic address setting is not in progress), no communica- tion with the indoor units in that system is possible. (Both ON) After power is turned ON (and automatic address setting is not in progress), one or more indoor units are confirmed in that system;...
  • Page 55 2WAY SYSTEM Trouble Diagnosis 2WAY SYSTEM 3. Remote Controller Servicing Functions 3. Remote Controller Servicing Functions Trouble Diagnosis Sensor temperature display function (displayed both when unit is running and stopped) • Use the following check procedure to display the sensor temperatures from the remote controller, indoor unit, and outdoor unit sensors on the remote controller display.
  • Page 56 2WAY SYSTEM Trouble Diagnosis 2WAY SYSTEM 3. Remote Controller Servicing Functions 3. Remote Controller Servicing Functions Remote Controller Functions 1 Keep pressing the buttons simultaneously for 4 or more seconds. The “Maintenance func” screen appears on the Sensor info.
  • Page 57 2WAY SYSTEM Trouble Diagnosis 2WAY SYSTEM 3. Remote Controller Servicing Functions 3. Remote Controller Servicing Functions Trouble Diagnosis Sensor Temperature Relationship Table Location where sensor Sensor address Sensor type Sensor address Sensor type is installed Indoor unit heat exchanger Room temp. controlled* temp.

  • Page 58: Way Alarm Codes

    2WAY SYSTEM Trouble Diagnosis 2WAY SYSTEM 4. 2WAY Alarm Codes 4. 2WAY Alarm Codes Trouble Diagnosis With types 8HP and 10HP, only one INV compressor is supplied. With types 12HP, 14HP and 16HP, one INV compressor and one constant-speed compressor (AC1) are supplied. With types 18HP and 20HP, one INV compressor and two constant-speed compressors (AC1, AC2) are supplied.
  • Page 59 2WAY SYSTEM Trouble Diagnosis 4. 2WAY Alarm Codes Compressor thermal protector is activated.(trip only and no alarm) 3 -23 Compressor 1 discharge temperature trouble 3 -24 High-pressure switch activated 3 -25 3 -25 Reverse phase (or missing phase) detected 3 -26 sensor differential alarm (Only when optional O sensor supplied) Compressor 1 (INV) overcurrent alarm...
  • Page 60 2WAY SYSTEM Trouble Diagnosis 4. 2WAY Alarm Codes 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 61 2WAY SYSTEM Trouble Diagnosis 4. 2WAY Alarm Codes E16 Alarm Alarm code Alarm meaning Automatic address setting alarm (too many units) Alarm conditions • The number of indoor units was too many when automatic 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 PCB is less than the number set.
  • Page 62 2WAY SYSTEM Trouble Diagnosis 4. 2WAY Alarm Codes 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 63 2WAY SYSTEM Trouble Diagnosis 4. 2WAY Alarm Codes F04, F05, F22 Alarm Alarm code F04, F05, F22 Alarm meaning Compressor 1 discharge temperature sensor trouble, compressor 2 discharge temperature sensor trouble, Compressor 3 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 64 2WAY SYSTEM Trouble Diagnosis 4. 2WAY Alarm Codes 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 65 2WAY SYSTEM Trouble Diagnosis 4. 2WAY Alarm Codes F08 Alarm Alarm code Alarm meaning Outdoor air temperature sensor trouble Alarm conditions (1) A/D step is 10 steps or less (short circuit). (2) A/D step is 1014 steps or more (open circuit) Probable cause (1) Sensor malfunction (including connector) (2) PCB malfunction...
  • Page 66 2WAY SYSTEM 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis 4. 2WAY Alarm Codes 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 continuously for 30 minutes while outdoor units stopped. •...
  • Page 67 2WAY SYSTEM 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis 4. 2WAY Alarm Codes 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) PCB malfunction Check (1) Measure the sensor resistance.
  • Page 68 2WAY SYSTEM 2WAY SYSTEM Trouble Diagnosis 4. 2WAY Alarm Codes Trouble Diagnosis 4. 2WAY Alarm Codes H11, H12, H21, H22 Alarm Alarm code H11, H12, H21, H22 Alarm meaning H11: Constant speed compressor 2 overcurrent alarm H12: Constant speed compressor 2 lock current alarm H21: Constant speed compressor 3 overcurrent alarm H22:...
  • Page 69 2WAY SYSTEM Trouble Diagnosis 2WAY SYSTEM 4. 2WAY Alarm Codes 4. 2WAY Alarm Codes Trouble Diagnosis H03, H13, H23 Alarm Alarm code H03, H13, H23 Alarm meaning H03 : Compressor 1 CT sensor disconnected or short-circuit H13 : Compressor 2 CT sensor disconnected or short-circuit H23 : Compressor 3 CT sensor disconnected or short-circuit Alarm conditions Compressor 1:...
  • Page 70 2WAY SYSTEM Trouble Diagnosis 3WAY SYSTEM 4. 2WAY Alarm Codes 4. 3WAY Alarm Codes 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 71 2WAY SYSTEM Trouble Diagnosis 4. 2WAY Alarm Codes H08, H27, H28 Alarm Alarm code H08, H27, H28 Alarm meaning Trouble (open circuit) with the oil sensor (connection) at compressor 1, compressor 2, or compressor 3 Alarm conditions This alarm occurs when a connector connection (pins 1 and 2 for compressor 1, pins 4 and 5 for compressor 2, and pins 7 and 8 for compressor 3) is open.
  • Page 72 2WAY SYSTEM Trouble Diagnosis 4. 2WAY Alarm Codes H31 Alarm Alarm code Alarm meaning 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. The HIC judges the current and temperature, and outputs the trouble signal. In general this indicates trouble with the HIC itself.
  • Page 73 2WAY SYSTEM Trouble Diagnosis 4. 2WAY Alarm Codes L10 Alarm Alarm code Alarm meaning Outdoor unit capacity not set Alarm conditions The outdoor unit capacity has not been set, or the setting is not allowed by the system. Probable cause This alarm occurs because the capacity has not been set.
  • Page 74 2WAY SYSTEM Trouble Diagnosis 2WAY SYSTEM 4. 2WAY Alarm Codes 4. 2WAY Alarm Codes Trouble Diagnosis P03, P17, P18 Alarm Alarm code P03, P17, P18 Alarm meaning P03 : Compressor 1 discharge temperature trouble P17 : Compressor 2 discharge temperature trouble P18 : Compressor 3 discharge temperature trouble Alarm conditions Compressor 1 : Pre-trip stops when the temperature exceeds 106°C.
  • Page 75 2WAY SYSTEM 3WAY SYSTEM 4. 3WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis 4. 2WAY Alarm Codes P04 Alarm Alarm code Alarm meaning High-pressure switch activated. P04 Alarm Alarm conditions The operation of the electronic circuit in the high-pressure switch may short-circuit the terminal depending on the pressure.
  • Page 76 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis 2WAY SYSTEM Trouble Diagnosis 4. 2WAY Alarm Codes P14 Alarm Alarm code Alarm meaning sensor operation P14 Alarm It is judged an error whenever the outdoor unit receives the signal “O Alarm Generated” Alarm conditions Alarm code from the indoor unit.
  • Page 77 2WAY SYSTEM Trouble Diagnosis 4. 2WAY Alarm Codes P20 Alarm Alarm code Alarm meaning High load alarm Alarm conditions The high pressure increases rapidly for a short time. Probable cause (1) The service valve in closed (2) Operation failure of mechanical valve (3) Outdoor fan motor trouble Check Check the service valve, mechanical valve and outdoor fan motor.
  • Page 78 2WAY SYSTEM Trouble Diagnosis 4. 2WAY Alarm Codes P29 Alarm Alarm code Alarm meaning Inverter compressor missing phase or lock alarm Alarm conditions This alarm may occur at start, and occurs when missing phase or lock is detected, and when a DCCT failure occurs.

  • Page 79: Blinking Inspection Display

    2WAY SYSTEM WARNING Trouble Diagnosis 5. Blinking Inspection Display Currently the blinking inspection display can be displayed only on the wired remote controller CAUTION and system remote controller. Blinking inspection display (1) (Automatic backup) Alarm code (Blinking inspection display) Alarm meaning Automatic backup is in progress.
  • Page 80 2WAY SYSTEM Trouble Diagnosis 5. Blinking Inspection Display Blinking inspection display (2) (compressor magnet SW seizing detection) Alarm code (Blinking inspection display) Alarm meaning Compressor magnet SW seizing detected Status: Although an outdoor unit exists where the outdoor unit fan is running, no compressors in the system are operating.

  • Page 81: Inspection And Characteristics Of Parts

    2WAY SYSTEM Trouble Diagnosis 2WAY SYSTEM 6. Inspection and Characteristics of Parts 6. Inspection of Parts Trouble Diagnosis (1) High-Pressure Switch (63PH1, 63PH2, 63PH3), Optional High-Pressure Switch for Renewal (63PH4,63PH5) 63PH1 Disconnect the CN3 connector (3P, white) from the outdoor unit control panel. Measure the resistance between socket pins 1 and 3.
  • Page 82 2WAY SYSTEM 2WAY SYSTEM Trouble Diagnosis 6. Inspection and Characteristics of Parts 6. Inspection and Characteristics of Parts Trouble Diagnosis (4) Coil Resistance of Outdoor Unit Fan Motor unit : ohm DMSBG75SY 10HP 12HP 14HP 16HP 18HP 20HP U - V Resistance U - W (at 20°C)

  • Page 83: Test Pin

    2WAY SYSTEM Trouble Diagnosis 2WAY SYSTEM 7. Test Pin 7. Test Pin 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 84 Mini VRF SYSTEM 2WAY SYSTEM 6. Symptom: Thermostat in OFF continues or 8. Symptom: Thermostat in OFF continues or Trouble Diagnosis Trouble Diagnosis cycles OFF & ON too frequently cycles OFF & ON too frequently How to detect abnormality • Abnormality does not occur.

  • Page 85: Pcb Settings

    2WAY SYSTEM PCB Settings Contents 4. PCB Settings 1. Outdoor Unit Control PCB ....................4-2...

  • Page 86: Outdoor Unit Control Pcb

    2WAY SYSTEM PCB Settings 1. Outdoor Unit Control PCB 1-1. Outdoor Unit Control PCB A747035 Snow senser STOP pin A. ADD pin RUN pin AP pin CHK pin TEST pin (CN34) (CN28) (CN30) HIC3 (CN27) (CN24) (CN23) (CN22) DEMAND FORCED DEF pin STOP (CN25)
  • Page 87 2WAY SYSTEM PCB Settings 1. Outdoor Unit Control PCB Functions (for A747035) Automatic address setting 2P plug (white): Automatic address setting pin (CN30) • Short-circuit this pin for 1 second or longer to automatically set the addresses at the indoor units that are connected to that outdoor unit and are within the same system.
  • Page 88 2WAY SYSTEM 3WAY SYSTEM PCB Settings 1. Outdoor Unit Control PCB PCB Settings 2WAY SYSTEM 1. Outdoor Unit Control PCB PCB Settings 1. Outdoor Unit Control PCB Terminal plug 3P plug (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 89 2WAY SYSTEM PCB Settings 1. Outdoor Unit Control PCB 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) 1 refrigerant system only...
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  • Page 91: Self-Diagnostics Function Table

    2WAY SYSTEM Self-Diagnostics Function Table Contents 5. Self-Diagnostics Function Table 1. Self-Diagnostics Function Table ..................5-2...
  • Page 92 2WAY SYSTEM Self-Diagnostics Function Table 1. Self-Diagnostics Function Table Self-Diagnostics Function Table Causes and corrections in instances when automatic address setting cannot be started • Trouble Cause and correction The power LED (LED4) on the outdoor unit control PCB does not turn ON. Check for any errors in the power wiring to the outdoor unit, and check for a missing phase.
  • Page 93 2WAY SYSTEM Self-Diagnostics Function Table 1. Self-Diagnostics Function Table Check items Check that the indoor unit power is turned ON. Check that the inter-unit control wiring is connected correctly. (Check that there are no open circuits, short circuits, terminal plugs, incorrect wiring to the remote controller terminals, or similar problems.) Check that the remote controller wiring is connected correctly.
  • Page 94 2WAY SYSTEM 2WAY SYSTEM Self-Diagnostics Function Table Self-Diagnostics Function Table 1. Self-Diagnostics Function Table 1. Self-Diagnostics Function Table • The outdoor unit maintenance remote controller can be used to check the alarm display. The number of times that LED 1 and 2 blink on the outdoor unit control PCB can be used to check the alarm display. (Refer to “Checking the LED 1 and 2 Alarm Display on the Outdoor Unit Control PCB.”) Alarm code Alarm meaning...

  • Page 95: Service Checker

    2WAY SYSTEM Service Checker Contents 6. Service Checker 1. Outdoor Unit Maintenance Remote Controller ..............6-2...

  • Page 96: Outdoor Unit Maintenance Remote Controller

    2WAY SYSTEM Service Checker 1. Outdoor Unit Maintenance Remote Controller 1-1. Overview About the outdoor unit maintenance remote controller The outdoor unit utilizes non-volatile memory (EEPROM) on its PCB. This allows EEPROM data to replace the setting switches that were present on previous PCBs. The outdoor unit maintenance remote controller is used to set and change these EEPROM data.
  • Page 97 2WAY SYSTEM Service Checker 1. Outdoor Unit Maintenance Remote Controller Temperature monitor Displays the temperature from each indoor/outdoor sensor. Outdoor unit alarm history monitor Displays the outdoor unit alarm history. Setting the outdoor unit EEPROM data Settings mode 1 and settings mode 2 can be used to make outdoor unit EEPROM data settings. 1-3.
  • Page 98 2WAY SYSTEM Service Checker 1. Outdoor Unit Maintenance Remote Controller Display (functions) The item codes can be changed with the buttons. Item code Item Remarks Outdoor unit alarm Alarm code display No. of connected indoor units Quantity Unit Nos. of connected indoor unit 7-segment display Operating status of indoor unit 7-segment display...
  • Page 99 2WAY SYSTEM Service Checker 1. Outdoor Unit Maintenance Remote Controller XX-YY R.C. Displays the outdoor unit sub-bus address which is currently selected. XX = Outdoor unit system address (1 – 30) YY = Outdoor unit address (1 – 4) The locations where are displayed as shown in Fig.
  • Page 100 2WAY SYSTEM Service Checker 1. Outdoor Unit Maintenance Remote Controller Concerning the 7-segment 4-digit display of remote controller timer time The unit Nos. of connected units are indicated by four 7-segment digits and a colon. Display of unit Nos. 1 – 20 Meaning of colon 1 –...
  • Page 101 2WAY SYSTEM 2WAY SYSTEM Service Checker Service Checker 1. Outdoor Unit Maintenance Remote Controller 1. Outdoor Unit Maintenance Remote Controller 1-4. Monitoring Operations Display the indoor unit and outdoor unit sensor temperatures. Press and hold the (CHECK) and (CANCEL) buttons simultaneously for 4 seconds or longer to engage temperature monitor mode.
  • Page 102 2WAY SYSTEM Service Checker 1. Outdoor Unit Maintenance Remote Controller 1-5. Outdoor Unit Alarm History Monitor Recalls and displays the outdoor unit alarm history. • This is for the outdoor unit only. Indoor unit alarms cannot be recalled. • The indoor unit alarm history can be viewed on the indoor unit remote controller or other controller.
  • Page 103 2WAY SYSTEM 2WAY SYSTEM Service Checker Service Checker 1. Outdoor Unit Maintenance Remote Controller 1. Outdoor Unit Maintenance Remote Controller 1-6. Setting the outdoor unit EEPROM data (A) Display of first 3 digits This function is used to make the outdoor unit EEPROM data settings.
  • Page 104 2WAY SYSTEM Service Checker 1. Outdoor Unit Maintenance Remote Controller Setting mode 2 Press and hold the (CHECK) button, (SET) button and the (CANCEL) button simultaneously for 4 seconds or longer. Press the temperature setting buttons to change the item code. The item codes and setting data are shown in the table below.
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