Summary of Contents for Hans Grohe GE NF80UV
- Page 1 Service NF80UV 80% Upflow/Horizontal Two Stage Manual Variable Speed Gas Furnace READ CAREFULLY. KEEP THESE INSTRUCTIONS 31-5000731 Rev. 0 11-22 GEA...
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Page 2: Table Of Contents
SERVICE MANUAL NF80UV Gas Furnace 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 Unit Dimensions ............6 Improper installation, adjustment, alteration, service... -
Page 3: Technical Specifications
Technical Specifications MODEL NUMBER GUIDE N F F 80 80 U U V V 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 Heating Cooling Motor Blower CFM @ 0” - 0.5” w.c. CFM @ 0" - 0.8" w.c. Size Temp Size Speed Cooling Speed (hp) Rise Adjustment Stage Adjustment Setting Setting Setting Setting Setting Setting Setting Setting F° "A" "B"...
- Page 5 ACCESSORY LIST Catalog Number Description Natural to LP Kits 11K48 Two-Stage (0 - 7500 ft.) 11K47 Two-Stage (>7500 ft.) Return Air Base 68W61 14.5 Inch, A Width 68W62 17.5 Inch, B Width 68W63 21.0 Inch, C Width Note: For vent length and clearances to combustibles, please reference installation instructions. Page 5 31-5000731 Rev.
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Page 6: Unit Dimensions
Unit Dimensions 3-1/8 (79) SUPPLY AIR FLUE OUTLET OPENING (Top) OPTIONAL 23-3/4 EXTERNAL (603) SIDE RETURN AIR FILTER KIT (635) (Either Side) TOP VIEW 3/4 (19) 27-3/4 (705) Front Panel 3-1/4 (83) 9/16 19-7/16 3 (76) Right 9/16 (14) (14) (494) 6-3/4 (171) Left FLUE OUTLET... -
Page 7: Parts Arrangement
Parts Arrangement HEAT EXCHANGER COMBUSTION AIR INDUCER COMBUSTION AIR INDUCER PRESSURE SWITCH GAS VALVE CABINET BURNER BOX CONTROL BOX ACCESS PANELS (Includes two-stage integrated control, transformer and circuit breaker) BLOWER ASSEMBLY Figure 1. Expanded View Page 7 31-5000731 Rev. 0... -
Page 8: Unit Components
Unit Components WARNING NF80UV unit components are shown in Figure 1. The gas Shock hazard. valve, combustion air inducer and burners can be accessed Disconnect power before servicing. Integrated control by removing the access panel. Electrical components are is not field repairable. If control is inoperable, simply in the control box (Figure 2) found in the blower section. - Page 9 CFM LED Pin # Function An amber LED is provided on the control board to display Gas Valve Second Stage CFM. To determine what CFM the motor is delivering Second Stage Prove Switch at any time, count the number of times the amber LED flashes.
- Page 10 Heat Stage Jumper (single stage shown) Air Flow Heat Jumper Taps Cool Taps TERMINAL DESIGNATIONS HUM -Humidifier (120VAC) Line - Input (120VAC) XFMR - Transformer (120VAC) EAC - Indoor Air Accessory (120VAC) Cool - Cool Speed (120VAC) Park 1 - Dead terminal for alternate speed tap Park 2 - Dead terminal for alternate speed tap Figure 3.
- Page 11 Indoor Blower Motor MOTOR CONTROLLER Figure 5. GenTeq Blower Motor B3 Power Choke STATOR Blower Motor (WINDINGS) (not used on all motors) (B3) BEARING Figure 4. OUTPUT SHAFT ROTOR WARNING During blower operation, the ECM motor emits Figure 6. Blower Motor Components energy that may interfere with pacemaker operation.
- Page 12 Initial Power Up POWER CONTROL When line voltage is applied to B3, there will be a large CONNECTOR J48 CONNECTOR J49 inrush of power lasting less than 1/4 second. This inrush PIN 1 C1 PIN 2 W / W1 charges a bank of DC filter capacitors inside the controller. PIN 3 C2 If the disconnect switch is bounced when the disconnect is PIN 4 - Delay...
- Page 13 Motor speed is determined by the size of the electrical pulse sent to the motor windings. The longer the pulse, the faster the motor. OUTPUT FROM CONTROLLER TO MOTOR WINDINGS WINDINGS TURNED OFF WINDINGS TURNED ON ON PULSE OFF PULSE The frequency of the pulses to the windings is 20KHz.
- Page 14 Figure 9. Indoor Blower Operation - 1st Stage-2nd Stage (W1/W2) Heat Call Figure 12. Indoor Blower Operation - Single Stage Cooling Figure 10. Indoor Blower Operation - High Heat (W2) Call * Percentage of High Stage Cooling Figure 11. Indoor Blower Operation - Call for Fan * Percentage of High Stage Cooling Figure 13.
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Page 15: Heating Components
Flame Rollout Switches (S47) Heating Components Flame rollout switch is a high temperature limit located on top of the burner box, one on each side.- See Figure 14. The limit is a N.C. SPST manual-reset limit. When S47 Ignitor senses rollout, the circuit breaks and the ignition control The ignitor is made of durable silicon nitride. - Page 16 Gaskets Flue Transition Pressure Switch Ignitor Rollout Switches Orifice Plate Collector Box Combustion Air Inducer Sensor Manifold And Gas Valve Figure 14. Heating Components Page 16 31-5000731 Rev. 0...
- Page 17 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 18 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 19 Combustion Air Inducer Pressure Switch (S18) Set points vary depending on unit size. See Table 6. The pressure sensed by the switch is negative relative NF80UV series units are equipped with a dual combustion to atmospheric pressure. If the flue becomes obstructed air pressure switch (first and second stage) located on during operation, the switch senses a loss of negative the combustion air inducer orifice bracket.
- Page 20 Multiple Venting The NF80UV furnace can vent in multiple positions. See IMPORTANT Figure 18. 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.
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Page 21: Placement And Installation
Placing the Furnace into Operation Placement and Installation These units are equipped with an automatic ignition system. Do not attempt to manually light burners on these Make sure unit is installed in accordance with installation furnaces. Each time the thermostat calls for heat, the instructions and applicable codes. - Page 22 Is the unit ignition system in lock out? If the unit locks out again, call the service technician to inspect the unit for blockages. 10. Is pressure switch closed? Obstructed flue will cause unit to shut off at pressure switch. Check flue and outlet for blockages.
- Page 23 Manifold Pressure Proper Combustion Furnace should operate a minimum 15 minutes with correct NOTE: A pressure test adapter kit is available to facilitate manifold pressure and gas flow rate before checking manifold pressure measurement. combustion. Take combustion sample beyond the flue out let and compare to Table 8.
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Page 24: Proper Ground And Voltage
Proper Ground and Voltage A poorly grounded furnace can contribute to premature In addition, measure the AC voltage from Line Hot to Line Neutral (spade terminals) on the integrated ignitor failure. Use the following procedure to check for control. See Figure 22. This voltage should be in the ground and voltage to the integrated control. -
Page 25: Typical Operating Characteristics
Typical Operating Characteristics External Static Pressure Blower Operation and Adjustment 1. Tap locations shown in Figure 24. NOTE: The following is a generalized procedure and does not apply to all thermostat controls. Punch a 1/4” diameter hole in supply and return air plenums. -
Page 26: Maintenance
Check the cleanliness of blower assembly and Maintenance clean the housing, blower wheel and blower motor if necessary. The blower motors are prelubricated for At the beginning of each heating season, system should extended bearing life. No further lubrication is needed. be checked as follows by a qualified service technician: Inspect the combustion air inducer and clean if necessary. - Page 27 Cleaning the Heat Exchanger and Burners 19. Set thermostat and check for proper operation. NOTE: Use papers or protective covering in front of the 20. Check all piping connections, factory and field, for gas furnace during cleaning. leaks. Use a leak detecting solution or other preferred means.
- Page 28 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 26. Burner, Combustion Air Inducer Assembly, and Heat Exchanger Removal Page 28 31-5000731 Rev.
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Page 29: Wiring And Sequence Of Operation
Wiring and Sequence of Operation WARNING - CONNECTION DIAGRAM ELECTRIC SHOCK HAZARD, CAN CAUSE INJURY OR DEATH. UNIT MUST BE GROUNDED IN ACCORDANCE WITH PROPER POLARITY MUST BE OBSERVED FOR FIELD LINE NATIONAL AND LOCAL CODES. VOLTAGE SUPPLY. IGNITION CONTROL WILL LOCK OUT IF POLARITY IS REVERSED NOTE - IF ANY WIRE IN THIS APPLIANCE IS REPLACED, IT MUST BE... - Page 30 Figure 28. Wiring Schematic Page 30 31-5000731 Rev. 0...
- Page 31 Sequence of Operation Cooling The unit is set up at the factory for single stage cooling. On a call for heat from the room thermostat, the control For two stage cooling operation, clip the jumper wire board performs a 1 second self check. Upon confirmation located between the Y to Y2 terminals on the integrated that the pressure switch contacts are in an open position, ignition/blower control board.
- Page 32 All specifications and illustrations subject to change without notice and without incurring obligations. Printed in the U.S.A.