Haier GE NF80D070T3A Service Manual

80% downflow two-stage constant torque gas furnaces

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NF80DT

80% Downflow Two-Stage

Manual

Constant Torque Gas Furnaces

READ CAREFULLY.

KEEP THESE INSTRUCTIONS

31-5000733 Rev. 0 11-22 GEA

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Summary of Contents for Haier GE NF80D070T3A

Page 1 Service NF80DT 80% Downflow Two-Stage Manual Constant Torque Gas Furnaces READ CAREFULLY. KEEP THESE INSTRUCTIONS 31-5000733 Rev. 0 11-22 GEA...
Page 2 SERVICE MANUAL NF80DT 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 or Unit Components ............7...
Page 3 Technical Specifications MODEL NUMBER GUIDE N F F 80 80 D D T T 4 4 C C XX BRAND MAJOR/MINOR REVISION N - GE CABINET WIDTH PRODUCT A - 14.5 B - 17.5 F - FURNACE, GAS C - 21 AFUE NOMINAL CFM 3 - 1200 CFM...
Page 4 BLOWER PERFORMANCE NF80D070T3A Air Volume / Watts at Various Blower Speeds External Static High Medium-High Medium Medium-Low Pressure (Black) (Brown) (Blue) (Yellow) (Red) in. w.g. Watts Watts Watts Watts Watts 0.00 1475 1345 1190 0.10 1440 1325 1165 0.20 1410 1280 1135 0.30...
Page 5 ACCESSORIES Accessory Catalog Number Natural to LP Kits 2-Stage (0 - 7500 ft) 11K48 2-Stage (7501 - 10,000 ft) 11K47 Downflow Combustible Flooring Base 14.5" 11M59 17.5" 11M60 Twinning Kit Constant Torque Gas Furnace Twinning Kit 16W72 For vent length and clearances to combustibles, please reference installation instructions. Page 5 31-5000733 Rev.
Page 6 Parts Arrangement Top Cap Secondary Limit Indoor Blower Control Box (includes integrated control, transformer and door switch) Internal Flue Pipe Assembly Heat Exchanger Combustion Air Inducer Burner Box Assembly Primary Limit Gas Valve Figure 1. Page 6 31-5000733 Rev. 0...
Page 7 Door Interlock Switch (S51) Unit Components A door interlock switch is wired in series with line voltage. When the inner blower access panel is removed the unit ELECTROSTATIC DISCHARGE (ESD) will shut down. Precautions and Procedures Circuit Breaker (CB8) A 24V circuit breaker is also located in the control box. The CAUTION switch provides overcurrent protection to the transformer (T1).
Page 8 energized on low (first stage) heat speed. When the Pin # Function differential in the pressure switch is great enough, the Ignitor pressure switch closes and a 15-second pre-purge begins. Combustion Air Inducer High Speed After the 15-second pre-purge period, the ignitor warms Combustion Air Inducer Low Speed up for 20 seconds after which the gas valve opens for a Combustion Air Inducer Neutral...
Page 9 24VAC Indoor Ignitor and Combustion Blower Terminals Air Inducer Neutrals Flame Sense S4 DIP Switches Diagnostic Push Button On Board Links 3/16” QUICK CONNECT TERMINALS THERMOSTAT CONNECTIONS (TB1) FLAME SENSE SIGNAL DS = DEHUMIDIFICATION SIGNAL HI COOL 24VAC W2 = HEAT DEMAND FROM 2ND STAGE TSTAT LO COOL 24VAC W1 = HEAT DEMAND FROM 1ST STAGE TSTAT LO HEAT 24VAC...
Page 10 2ND STAGE HEAT ON DELAY 7 MIN UPSTAGE THERMOSTAT SELECTION DELAY COOLING BLOWER-OFF DELAY TWO STAGE THERMOSTAT 12 MIN UPSTAGE *45 SECOND COOL BLOWER DELAY 1−STAGE OFF DELAY THERMOSTAT (TIMED STAGING) −SEE SW #2 HSI/CAI 2 SECOND COOL BLOWER HEATING BLOWER−OFF DELAY OFF DELAY 90 SECOND HTG BLOWER...
Page 11 Display Action (when button released) No change (idle)* Remain in idle mode Solid “E” Enter diagnostic recal mode Solid “F” Enter flame signal mode * No change implies the display will continue to show whatever is currently being displayed for normal operation (blinking decimal, active error code, heat state, etc.) Table 3.
Page 12 Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E223 Low pressure switch failed open. Check pressure (inches w.c.) of low pressure switch closing on heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. Resumes normal operation after fault is cleared E224 Low pressure switch failed closed.
Page 13 Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E290 Ignitor circuit fault - Failed ignitor or triggering Measure resistance of hot surface ignitor. Replace if open or not within circuitry. specifications. 1-hour soft lockout. Clears when flame has been proven stable.
Page 14 Onboard Links Indoor Blower Operation DIP Switch Settings Switches 3 and 4 -- Heating Mode Blower-Off Delay -- W914 Dehum The blower-on delay of 30 seconds is not adjustable. The Onboard link W914, is a clippable connection between blower-off delay (time that the blower operates after the terminals R and DS on the integrated control.
Page 15 Blower Compartment Center Blower Wheel in Blower Housing IMPORTANT Each blower is statically and dynamically balanced as an assembly before installation in the unit. Secondary Limit Control (S21) The secondary limit (S21) is located in the blower compartment. See Figure 1. When excess heat is sensed in the blower compartment, the limit will open.
Page 16 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 “L1” and “Neutrals” on “L” and “N” on input plug P48. If voltage is present continue the integrated control.
Page 17 Gas Valve Heating Components The valve (Figure 13) is internally redundant to assure safety shut-off. If the gas valve must be replaced, the same type valve must be used. Ignitor The ignitor is made of durable silicon nitride. The integrated 24VAC terminals and gas control knob are located on the control provides 120 volts to the ignitor for a consistent valve.
Page 18 Ignitor Burners Rollout Switch Sensor Gas Valve Manifold and Gas Orifices Figure 9. Heating Components Page 18 31-5000733 Rev. 0...
Page 19 Test 1 Check ignitor circuit for correct resistance. Remove 5−pin plug from control. Check ohms reading across terminals 1 and 5. 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 20 Remove Sensor Wire from Flame Integrated Control and Sensor Connect Alligator Clip (−) to Frame Sensor Lead Flame Sensor Wire Integrated Control Flame Sensor DIGITAL METER Terminal Set dial to measure DC microamps Red Collar Indicates Positive Leads To Flame Terminal Remove Sensor Wire from Integrated Control and...
Page 21 Combustion Air Inducer (B6) All NF80DT units use a two-stage combustion air inducer to move air through the burners and heat exchanger during 3/16” terminals heating operation. The blower uses a 120VAC motor. The motor operates during all heating operation and is controlled by integrated control control A92.
Page 22 Placement and Installation HIGH FIRE ADJUSTMENT MANIFOLD INLET PRESSURE POST SCREW PRESSURE POST (under cap) Make sure unit is installed in accordance with installation instructions and applicable codes. Start-Up Preliminary and Seasonal Checks Inspect electrical wiring, both field and factory installed for loose connections.
Page 23 Testing Gas Piping 11. Are flame rollout switches tripped? If flame rollout switches are tripped, call the service technician for inspection. IMPORTANT Safety or Emergency Shutdown In case emergency shutdown is required, turn off the Turn off unit power. Close manual and main gas valves. main shut-off valve and disconnect the main power to unit.
Page 24 Manifold Pressure Measurement Gas Flow (Approximate) After line pressure has been checked and adjusted, check Furnace should operate at least 5 minutes before checking manifold pressure. Checks of manifold pressure are made gas flow. Determine time in seconds for two revolutions of as verification of proper regulator adjustment.
Page 25 Manifold Pressure Manifold Pressure Manifold Pressure Supply Line Pressure in. wg. 0 - 4,500 ft. in. wg. 4,501 - 7,500 ft. in. wg. 7,501 - 10,000 ft. in. wg. Capacity Low Fire High Fire Low Fire High Fire Low Fire High Fire Min.
Page 26 Proper Ground and Voltage In addition, measure the AC voltage from Line Hot to Line Neutral (spade terminals) on the integrated Furnace must properly grounded proper control. See Figure 15. This voltage should be in the performance. Use the following procedure to check for range of 97 to 132 Vac.
Page 27 External Static Pressure Typical Operating Characteristics 1. Tap locations shown in Figure 17. Punch a 1/4” diameter hole in supply and return air Blower Operation and Adjustment plenums. Insert manometer hose flush with inside NOTE: The following is a generalized procedure and does edge of hole or insulation.
Page 28 Annual Furnace Maintenance Maintenance At the beginning of each heating season, and to comply with the GE Appliances Limited Warranty, your system should be checked by a licensed professional technician (or equivalent) as follows: WARNING ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD. WARNING Failure to follow safety warnings exactly could result in Disconnect power before servicing unit.
Page 29 6. Check the cleanliness of blower assembly and 13. Perform a complete combustion analysis during the clean the housing, blower wheel and blower motor if furnace inspection to ensure proper combustion necessary. The blower motors are prelubricated for and operation. Consult Service Literature for proper extended bearing life.
Page 30 Cleaning the Heat Exchanger and Burners 16. Reconnect all wires. NOTE: Use papers or protective covering in front of the 17. Reconnect top cap and vent pipe to combustion air furnace during cleaning. inducer outlet. 18. Reconnect gas supply piping. 1.
Page 31 Wiring and Sequence of Operation CUT W914 JUMPER LABELED DEHUM FROM DS TO R, AT A92 CONTROL BOARD, WHEN USED WITH HUMIDIFICATION CONTROLS RESIDEO VALVE 070-3A 090-4B Figure 20. Wiring Diagram with Resideo/Honeywell Integrated Furnace Control 103132-xx Page 31 31-5000733 Rev. 0...
Page 32 120V ACC (IF USED) PRIMARY COMBUSTION AIR INDUCER MOTOR LIMIT VALVE BURNERS S102 HIGH HEAT PRESSURE SWITCH S128 FLAME IGNITOR LOW HEAT TO C FLAME FLAME HUMIDIFIER SENSOR ROLLOUT PRESSURE J159 ROLLOUT TO R OR H SWITCH SWITCH P159 SWITCH AT IFC JACKPLUG CHART TO N...
Page 33 Electronic Ignition At the end of the recognition delay, the integrated control energizes the combustion air inducer at high The two-stage, variable speed integrated control used in speed. The control also checks the high fire (second- NF80DT units has an added feature of an internal soft stage) pressure switch to make sure it is closed.
Page 34 After the 20-second warm-up period has ended, the When the thermostat heating demand is satisfied, the gas valve is energized on low fire (first stage) and combustion air inducer begins a 5-second low speed ignition occurs. At the same time, the control module post-purge.
Page 35 Field Wiring and DIP Switch Settings DIP Switch Settings and On-Board Links Thermostat Wiring Connections DIP Switch 1 On Board Links Must Be Cut To Select System Options FURNACE OUTDOOR T'STAT TERM. STRIP UNIT 1 Heat / 1 Cool NOTE: Use DIP DO NOT CUT ANY switch 2 to set...
Page 36 DIP Switch Settings and On-Board Links Thermostat Wiring Connections DIP Switch 1 On Board Links Must Be Cut To Select System Options FURNACE OUTDOOR T'STAT TERM. STRIP UNIT 2 Heat / 2 Cool CUT ON-BOARD LINK W915 2 STAGE COMPR *Not required on all units FURNACE OUTDOOR...
Page 37 DIP Switch Settings and On-Board Links Thermostat Wiring Connections DIP Switch 1 On Board Links Must Be Cut To Select System Options FURNACE HEAT PUMP TERM. STRIP T'STAT CUT ON-BOARD LINK 67M41* W951 Dual Fuel Single- HEAT Stage Heat Pump PUMP Thermostat w/dual fuel capabilities...
Page 38 DIP Switch Settings and On-Board Links Thermostat Wiring Connections DIP Switch 1 On Board Links Must Be Cut To Select System Options FURNACE HEAT PUMP TERM. STRIP T'STAT Dual Fuel Single- 67M41* Stage Heat Pump CUT ON-BOARD LINK Thermostat w/dual W951 fuel capabilities HEAT...
Page 39 Troubleshooting Troubleshooting: Heating Sequence of Operation HEATING SEQUENCE OF OPERATION NORMAL AND ABNORMAL HEATING MODE POWER ON GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF. (RESET CONTROL BY CONTROL SELF-CHECK OKAY? TURNING MAIN POWER OFF.) POLARITY REVERSED. POLARITY OKAY? STATUS ERROR CODE 5 + 4.
Page 40 Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT STATUS LED - HEARTBEAT. (Refer to box A on previous page) GAS VALVE OFF. COMBUSTION AIR INDUCER FIRST-STAGE (LOW FIRE) PRESSURE OFF. INDOOR BLOWER OFF. UNIT WILL RETRY SWITCH CLOSED WITHIN 2.5 MINUTES? AFTER 5-MINUTE WAIT PERIOD.
Page 41 Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT. STATUS LED -- HEARTBEAT. SEE BOX A. FLAME SIGNAL ABOVE ( 1.40 microamps) LOW FLAME SIGNAL (Does not affect control operation) STATUS ERROR CODE 1 + 2. SINGLE-STAGE THERMOSTAT MODE TWO STAGE THERMOSTAT MODE (DIP SWITCH SET AT “ON”)
Page 42 Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE OF OPERATION CONTINUED SEE BOX A NORMAL OPERATION. SEE BOX B THERMOSTAT CALLS FOR HEAT. RETURN TO FIRST-STAGE HEAT MODE. FIRST-STAGE CONTINUES UNTIL SECOND- STAGE PRESSURE SWITCH CAN BE PROVEN SECOND-STAGE (HIGH FIRE) HEAT or HEAT DEMAND IS SATISFIED.
Page 43 Troubleshooting: Cooling Sequence of Operation COOLING SEQUENCE OF OPERATION POWER ON SIGNAL POLARITY REVERSED. CONTROL WILL CONTINUE TO CALL FOR COOLING IS POLARITY REVERSED? IN THIS CONDITION. STATUS ERROR CODE 5 + 4. SIGNAL IMPROPER GROUND AT LED. CONTROL WILL CONTINUE TO CALL FOR COOLING IS THERE IN THIS CONDITION.
Page 44 Troubleshooting: Continuous Fan Sequence of Operation CONTINUOUS LOW SPEED FAN SEQUENCE OF OPERATION MANUAL FAN SELECTION MADE AT THERMOSTAT. AFTER 2 SECOND DELAY, INDOOR BLOWER IS ENERGIZED ON CONTINUOUS FAN SPEED. THERMOSTAT CALLS FOR FIRST STAGE COOL. THERMOSTAT CALLS FOR FIRST-STAGE HEAT. INDOOR BLOWER RAMPS TO FIRST STAGE AFTER 45-SECOND DELAY, INDOOR BLOWER COOLING SPEED AFTER A 2-SECOND DELAY.
Page 45 Notes Page 45 31-5000733 Rev. 0...
Page 46 All specifications and illustrations subject to change without notice and without incurring obligations. Printed in the U.S.A. Page 46 31-5000733 Rev. 0...

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