31-5000735 Rev. 0 11-22 GEA
NF80US
80% Upflow/Horizontal Single
Stage Constant Torque Gas
Furnace
Service
Manual
READ CAREFULLY.
KEEP THESE INSTRUCTIONS
.
Страница 1: ...31 5000735 Rev 0 11 22 GEA NF80US 80 Upflow Horizontal Single Stage Constant Torque Gas Furnace Service Manual READ CAREFULLY KEEP THESE INSTRUCTIONS...
Страница 2: ...you see this symbol on labels or in manuals be alert to the potential for personal injury or death Electric shock hazard Can cause injury or death Before attempting to perform any service or maintena...
Страница 3: ...8 40 127 NF80U090S4B 88 000 72 000 80 00 2 1 2 4 1 2 120 60 1 15 8 4 40 142 NF80U090S5C 88 000 72 000 80 00 3 5 1 2 120 60 1 15 10 9 40 152 NF80U110S5C 110 000 90 000 80 00 4 5 1 2 120 60 1 15 10 9 40...
Страница 4: ...0 930 865 790 735 Low 885 825 770 695 625 540 445 NF80U090S4B 3 4 10 x 10 35 65 High 1730 1690 1645 1615 1590 1545 N A Med High 1505 1460 1435 1395 1350 1300 1270 Med 1380 1345 1310 1265 1210 1175 114...
Страница 5: ...Kit 11K50 Single Stage 11K45 High Altitude Return Air Base 68W61 14 5 A Width 68W62 17 5 B Width 68W63 21 0 C Width 68W64 24 5 D Width Twinning Kit 16W72 Constant Torque Gas Furnace Twinning Kit Note...
Страница 6: ...witch and transformer Gas Valve Burner Box includes sensor ignitor and rollout switches Combustion Air Inducer Combustion Air Inducer Pressure Switch Heat Exchanger Primary Limit under combustion air...
Страница 7: ...vides overcurrent protection to the transformer T1 The breaker is rated at 3A at 32V If the current exceeds this limit the breaker will trip and all unit operation will shutdown The breaker can be man...
Страница 8: ...Low Flame Signal check flame sensor 5 Soft lockout burner failed to light exceeded maximum number of retries or recycles 6 Not Used 7 Primary or Secondary Limit Open or Soft Lockout Mode Limit Switch...
Страница 9: ...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...
Страница 10: ...a high temperature limit Each furnace is equipped with two identical switches The limit is a N C SPST manual reset limit connected in series with the integrated control A92 When S47 senses rollout the...
Страница 11: ...ustion Air Inducer Primary Limit Gas Valve Figure 6 The NF80US uses an internally redundant valve to assure safety shut off If the gas valve must be replaced the same type valve must be used 24VAC ter...
Страница 12: ...r Wire from Integrated Control and Connect Alligator Clip to Flame Sensor Lead Flame Sensor Terminal Remove Sensor Wire from Integrated Control and Connect Alligator Clip to Terminal on Control DIGITA...
Страница 13: ...into terminals 2 and 4 use small diameter probes in order not to damage plug Check voltage during 20 second ignitor warm up period Voltage should read 120 volts 10 If voltage reads below these values...
Страница 14: ...tch is a single pole single throw proving switch electrically connected to the furnace control The purpose of the switch is to prevent burner operation if the combustion air inducer is not operating o...
Страница 15: ...nducer then reinstall the mounting screws See unit Installation Instructions for more detail The combustion air pressure switch must be moved for horizontal discharge air left position IMPORTANT Figur...
Страница 16: ...mA Troubleshooting the Motor Troubleshooting the motor is an easy process Follow steps below 1 Shut off power to unit 2 Remove input plugs P48 and P49 from motor See Figure 14 for troubleshooting proc...
Страница 17: ...If 24 volts is not present problem may be up stream of plug P49 Proceed to test 4 Multi Meter set to VAC 12 0 12 0 24 Multi Meter set to VAC problem is with the harness If voltage is not present probl...
Страница 18: ...ay need to be repeated to purge air from gas line 12 If the appliance will not operate follow the instructions Turning Off Gas to Unit and call your service technician or gas supplier Turning Off Gas...
Страница 19: ...e in Table 7 If manifold pressure matches Table 9 and rate is incorrect check gas orifices for proper size and restriction Remove temporary gas meter if installed NOTE To obtain accurate reading shut...
Страница 20: ...P Propane 10 0 10 0 10 0 10 0 11 0 090 Natural 3 5 3 2 2 7 3 5 4 5 LP Propane 10 0 10 0 9 6 10 0 11 0 110 Natural 3 5 3 5 3 0 3 5 4 5 LP Propane 10 0 10 0 9 6 10 0 11 0 135 Natural 3 5 3 5 2 9 3 5 4 5...
Страница 21: ...ates a poor or partial ground Compare the readings to Table 11 If the readings exceed the maximum shown in Table 11 make repairs before operating the furnace 2 In addition measure the AC voltage from...
Страница 22: ...nd return air plenums Insert manometer hose flush with inside edge of hole or insulation Seal around the hose with permagum Connect the zero end of the manometer to the discharge supply side of the sy...
Страница 23: ...ondition and cleanliness of burners and heat exchanger and clean if necessary 6 Check the cleanliness of blower assembly and clean the housing blower wheel and blower motor if necessary The blower mot...
Страница 24: ...to spread cabinet side to allow more room If so remove five screws from the left side or right side of cabinet See Figure 20 9 Backwash using steam Begin from the burner opening on each clam Steam mus...
Страница 25: ...t Collector Box Orifice Plate Flue Transition Pressure Switch Combustion Air Inducer Manifold And Gas Valve Retention Rings Cross Over Ignitor Flame Sensor Rollout Switches Figure 21 Burner Combustion...
Страница 26: ...FOR HEATING IF THE RESULTING TEMPERATURE RISE IS OUTSIDE OF THE RANGE SPECIFIED ON THE RATING PLATE R REQUIRED ON SOME OUTDOOR UNITS PARK TERMINALS ARE UNPOWERED TERMINALS ALL UNUSED MOTOR LEADS MUST...
Страница 27: ...AS VALVE OFF COMBUSTION AIR INDUCER ON INDOOR BLOWER ON HEATING SPEED LED FLASHES CODE 11 PRESSURE SWITCH CLOSED GAS VALVE OFF COMBUSTION AIR INDUCER OFF INDOOR BLOWER OFF WITH DELAY Sequence holds un...
Страница 28: ...IS 60 MINUTE RESET PERIOD COMPLETE YES 4 SECONDS YES HAS CONTROL RESET IGNITION SEQUENCE FOUR TIMES FLAME SIGNAL 1 5 MICROAMPS OR GREATER YES YES YES ROLLOUT SWITCH CLOSED LED FLASHES CODE 8 ROLLOUT S...
Страница 29: ...ED CONTINUOUSLY IS ROLLOUT SWITCH CLOSED LED SLOW FLASH RATE REMAINS UNCHANGED THROUGHOUT COOLING CYCLE THERMOSTAT CALLS FOR COOLING COMPRESSOR CONTACTOR AND SYSTEM FAN ENERGIZED WITH 2 SECOND DELAY C...
Страница 30: ...MOSTAT OPENS SYSTEM FAN SWITCHED TO COOL SPEED EAC TERM REMAINS ON THERMOSTAT OPENS MANUAL FAN SELECTION MADE AT THERMOSTAT CONTROL G ENERGIZES SYSTEM FAN AT FAN SPEED EAC TERM ENERGIZED NO YES YES NO...
Страница 31: ...Page 31 31 5000735 Rev 0 Notes...
Страница 32: ...Printed in the U S A All specifications and illustrations subject to change without notice and without incurring obligations...
