Haier GE NF80LS Service Manual
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Haier GE NF80LS Service Manual

Haier GE NF80LS Service Manual

80% upflow/horizontal single stage constant torque low nox (40 ng/j) gas furnace
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Service
NF80LS
80% Upflow/Horizontal Single
Manual
Stage Constant Torque Low NOx
(<40 Ng/J) Gas Furnace
READ CAREFULLY.
.
KEEP THESE INSTRUCTIONS
31-5000737 Rev. 0 11-22 GEA
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Summary of Contents for Haier GE NF80LS

  • Page 1 Service NF80LS 80% Upflow/Horizontal Single Manual Stage Constant Torque Low NOx (<40 Ng/J) Gas Furnace READ CAREFULLY. KEEP THESE INSTRUCTIONS 31-5000737 Rev. 0 11-22 GEA...

  • Page 2: Table Of Contents

    SERVICE MANUAL NF80LS This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to the potential for personal injury or death. Table of Contents WARNING Technical Specifications ..........3 Parts Arrangement............6 Improper installation, adjustment, alteration, service Unit Components ............7...

  • Page 3: Technical Specifications

    Technical Specifications MODEL NUMBER GUIDE N F F 80 80 L L S S 4 4 A A XX BRAND MAJOR/MINOR REVISION N - GE CABINET WIDTH PRODUCT A - 14.5 F - FURNACE, GAS B - 17.5 C - 21 AFUE NOMINAL CFM 3 - 1200 CFM...
  • Page 4 BLOWER PERFORMANCE DATA CFM @ External Static Pressure - " w.c. Motor Temp Blower Blower Model Size Rise Size Speed (hp) (°F) 0.20 0.30 0.40 0.50 0.60 0.70 0.80 High 1320 1290 1265 1230 1190 1165 1130 Med/High 1080 1055 1010 NF80L045S3A 10 x 8...
  • Page 5 ACCESSORIES System Accessory Kit Number Description 11K50 1-Stage Natural to LP Kit 11K45 High Altitude (>7500') 68W61 14.5" A Width Return Air Base 68W62 17.5" B Width 68W63 21.0" C Width Twinning Kit 16W72 Constant Torque Gas Furnace Twinning Kit Note: For vent length and clearances to combustibles, please reference installation instructions.

  • Page 6: Parts Arrangement

    Parts Arrangement Make-Up Box Heat Exchanger Combustion Air Inducer Combustion Air Inducer Pressure Switch Burner Box (includes sensor, ignitor and rollout switches) Gas Valve Primary Limit Control Box (under (includes integrated control, combustion interlock switch and transformer) air inducer) Blower Assembly Power Choke (not on all models) Figure 1.

  • Page 7: Unit Components

    Circuit Breaker (CB8) Unit Components A 24V circuit breaker is also located in the control box. The switch provides overcurrent protection to the transformer NF80LS unit components are shown in Figure 1. The (T1). The breaker is rated at 3A at 32V. If the current gas valve, combustion air inducer and burners can be exceeds this limit the breaker will trip and all unit operation accessed by removing the upper access panel.
  • Page 8 1/4” Quick Connect Terminals 120HUM Humidifier 120VAC LINE 120VAC XFMR Transformer 120VAC CIRC Indoor Blower 120VAC Indoor Air Quality Accessory 120VAC NEUTRALS Common 120VAC HUM24 Humidifier 24VAC 3/16” Quick Connect Terminals COOL Cooling Tap 24VAC HEAT Heating Tap 24VAC Continuous Blower 24VAC PARK (no power) Park terminal for unused speed taps Flame Sense...
  • Page 9 an inter purge and warm-up time between trials of 35 seconds. After a total of five trials for ignition (including the initial trial), the integrated control goes into Soft Lockout- Flame Failure mode. After a 60-minute reset period, the integrated control will begin the ignition sequence again. Fan Time Control Heating Fan On Time The fan on time of 30 seconds is not adjustable.
  • Page 10 Gaskets Flue Transition Pressure Switch Ignitor Rollout Switches Orifice Plate Collector Box Combustion Air Inducer Sensor Manifold And Gas Valve Figure 6. Heating Components Cooling Fan On Time Flame Rollout Switches (Figure 6) The fan on time is 2 seconds and is not adjustable. Flame rollout switch (S47) is a high temperature limit.
  • Page 11 A microamp DC meter is needed to check the flame signal Gas Valve (Figure 6) on the integrated control. The NF80LS uses an internally redundant valve to assure safety shut-off. If the gas valve must be replaced, the same Flame (microamp) signal is an electrical current which type valve must be used.
  • Page 12 Remove Sensor Wire from Flame Integrated Control and Sensor Connect Alligator Clip (−) to Flame Sensor Lead Flame Sensor Wire DIGITAL METER Set dial to measure dc microamps Integrated Control Red Collar Indicates Positive Lead Flame Sensor Terminal (-) To flame sensor (+) To Control...
  • Page 13 Test 1 Check ignitor circuit for correct resistance. Remove 4-pin plug from control. Check ohms reading across terminals 2 and 4. The reading should be between 39 and 70 ohms. If value is correct, this is the only test needed. If the reading on the meter is not correct, (0 or infinity) then a second test is needed.
  • Page 14 Combustion Air Inducer (B6) On start-up, the switch senses that the combustion air inducer is operating. It closes a circuit to the integrated All NF80LS units use a combustion air inducer to move control when pressure inside the combustion air inducer air through the burners and heat exchanger during heating decreases to a certain set point.
  • Page 15 Multiple Venting The NF80LS furnace can vent in multiple positions. See IMPORTANT Figure 11. The combustion air pressure switch must be moved for The make up box may be removed and the combustion air horizontal discharge air left position. inducer may be rotated clockwise or counterclockwise 90° to allow for vertical or horizontal vent discharge in a vertical or horizontal cabinet position.
  • Page 16 Blower Compartment Center Blower Wheel in Blower Housing IMPORTANT Each blower is statically and dynamically balanced as an assembly before installation in the unit. NF80LS units are equipped with a constant torque ECM motor. It has a DC motor coupled to an electronic control module both contained in the same motor housing.
  • Page 17 Multi−Meter (set to VAC) Multi−Meter (set to VAC) Test 1 Test 3 (if necessary) Turn on power to unit. Check for 120 volts across terminals Check for 120 volts across terminals “CIRC” and “Neutrals” “L” and “N” on input plug P48. If voltage is present continue on the integrated control.

  • Page 18: Placement & Installation

    12. If the appliance will not operate, follow the instructions Placement & Installation “Turning Off Gas to Unit” and call your service technician or gas supplier. Make sure unit is installed in accordance with installation instructions and applicable codes. Turning Off Gas to Unit 1.
  • Page 19 Gas Pressure Adjustment IMPORTANT Gas Flow (Approximate) In case emergency shutdown is required, turn off the Furnace should operate at least 5 minutes before checking main shut-off valve and disconnect the main power to gas flow. Determine time in seconds for two revolutions of unit.
  • Page 20 Proper Combustion High Altitude Furnace should operate minimum 15 minutes with correct The manifold pressure may require adjustment and manifold pressure and gas flow rate before checking combustion air pressure switch may need replacing to combustion. Take combustion sample beyond the flue ensure proper combustion at higher altitudes.
  • Page 21 Proper Ground and Voltage In addition, measure the AC voltage from Line Hot to Line Neutral (spade terminals) on the integrated A poorly grounded furnace can contribute to premature control. See Figure 17. This voltage should be in the ignitor failure. Use the following procedure to check for range of 97 to 132 VAC ground and voltage to the integrated control.

  • Page 22: Typical Operating Characteristics

    External Static Pressure Typical Operating Characteristics 1. Tap locations shown in Figure 19. Punch a 1/4” diameter hole in supply and return air Blower Operation and Adjustment plenums. Insert manometer hose flush with inside edge of hole or insulation. Seal around the hose with NOTE: The following is a generalized procedure and does permagum.

  • Page 23: Maintenance

    Inspect all gas pipe and connections for leaks. Maintenance Check the cleanliness of filters and change if necessary (monthly). At the beginning of each heating season, and to comply Check the condition and cleanliness of burners and with the GE Appliances Limited Warranty, your system heat exchanger and clean if necessary.
  • Page 24 Clock gas meter to ensure that the unit is operating 15. Reinstall collector box and combustion air assembly. at the specified firing rate. Check the supply pressure Reinstall all screws to the collector box and combustion and the manifold pressure. On two-stage gas furnaces air inducer.
  • Page 25 Remove 5 screws if necessary (either side of cabinet) Figure 21. Gasket Flue Transition Pressure Switch Heat Exchanger Ignitor Rollout Switches Orifice Plate Collector Box Combustion Air Inducer Flame Sensor Retention Rings Cross Over Manifold And Gas Valve Figure 22. Burner, Combustion Air Inducer Assembly & Heat Exchanger Removal Page 25 31-5000737 Rev.

  • Page 26: Wiring Diagram

    Wiring Diagram 045*3A 070*3A 090*4B 090*5C 110*5C 135*5D Figure 23. Wiring Diagram Page 26 31-5000737 Rev. 0...

  • Page 27: Troubleshooting: Heating Sequence Of Operation

    Troubleshooting: Heating Sequence of Operation HEATING SEQUENCE OF OPERATION ABNORMAL HEATING MODE NORMAL HEATING MODE POWER ON GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER DELAY OFF. CONTROL SELF-CHECK OKAY? LED SLOW FLASH (RESET CONTROL BY TURNING MAIN POWER OFF.) LED FLASHES CODE 1 - POLARITY IS POLARITY CORRECT? REVERSED.

  • Page 28: Troubleshooting: Heating Sequence Of Operation (Continued)

    Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE CONTINUED 15 SECOND COMBUSTION AIR INDUCER PREPURGE INITIATED BY CLOSED PRESSURE SWITCH. LED FLASHES CODE 13 - LOW LINE VOLTAGE. ONCE VOLTAGE IS ABOVE IS VOLTAGE ABOVE 70 VOLTS? IGNITOR WARM UP -- 20 SECONDS. 75 VOLTS, HEATING SEQUENCE RESTARTS.

  • Page 29: Troubleshooting: Cooling Sequence Of Operation

    Troubleshooting: Cooling Sequence of Operation COOLING SEQUENCE OF OPERATION POWER ON IGNITION CONTROL MAIN POWER ON. LED FLASHES STEADY - CIRCUIT BOARD FAILURE CONTROL SELF DIAGNOSTIC CHECK. GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. IS CONTROL OPERATING NORMALLY? INDOOR BLOWER OFF WITH NORMAL DELAY. INTERRUPT MAIN POWER TO RESET CONTROL.

  • Page 30: Troubleshooting: Continuous Fan / Accessories Sequence Of Operation

    Troubleshooting: Continuous Fan / Accessories Sequence of Operation CONTINUOUS FAN / ACCESSORIES SEQUENCE OF OPERATION LED: SLOW FLASH RATE REMAINS UNCHANGED THROUGHOUT SEQUENCE. MANUAL FAN SELECTION MADE AT THERMOSTAT. CONTROL (G) ENERGIZES SYSTEM FAN AT FAN SPEED. EAC TERMINAL IS ENERGIZED. THERMOSTAT CALLS FOR HEAT (W).
  • Page 31 Notes Page 31 31-5000737 Rev. 0...
  • Page 32 All specifications and illustrations subject to change without notice and without incurring obligations. Printed in the U.S.A.

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