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Bryant GAS-FIRED INDUCED-COUSTION FURNACES 373LAV manual

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Table of contents for the manual

  • Page 1

    NOTE: Read the entire instruction manual before performing any service or maintenance. This symbol → indicates a change since the last issue. These procedures are for size 44,000 through 154,000 Btuh input units. Index Page SAFETY CONSIDERATIONS ..................................................1-2 ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCED[...]

  • Page 2

    WARNING: The ability to properly perform mainte- nance on this equipment requires certain expertise, me- chanical skills, tools, and equipment. If you do not possess these, do not attempt to perform any maintenance on this equipment other than those procedures recom- mended in the User’s Manual. FAILURE TO FOLLOW THIS WARNING COULD RESULT IN POSS[...]

  • Page 3

    1. Downflow/Horizontal Each furnace requires 2 filters which are installed in the return-air duct. (See Fig. 4 and 5.) To remove filters for cleaning or replacement, proceed as follows: a. Disconnect electrical power before removing blower access door. b. Remove screw from front of door and remove blower access door. c. Reach up behind top plate, t[...]

  • Page 4

    9. If a greasy residue is present on blower wheel, remove wheel from the blower housing and wash it with an appropriate degreaser. To remove wheel: a. Mark blower wheel location on shaft before disassembly to ensure proper reassembly. b. Loosen setscrew holding blower wheel on motor shaft. NOTE: Mark blower mounting arms, motor, and blower housing [...]

  • Page 5

    WARNING: Blower access door switch opens 115-v power to furnace control. No component operation can occur. Caution must be taken when manually closing this switch for service purposes. Failure to follow this warn- ing could result in electrical shock, personal injury, or death. NOTE: If thermostat terminals are jumpered before blower ac- cess door [...]

  • Page 6

    (8.) Reinstall cell inlet plates and burner assembly. Care must be exercised to center burners in cell openings. 11. Clean flame sensor with fine steelwool. 12. Remove old sealant from center panel and collector box flange and apply new sealant to collector box flange and reinstall on center panel, making sure all 8 screws are secure. NOTE: A relea[...]

  • Page 7

    c. Remove control access door. d. BRIEFLY remove either wire from the main limit switch until LED goes out, then reconnect it. NOTE: If wire to main limit is disconnected longer than 4 sec, main blower starts, and retrieval request is ignored. 2. When above items have been completed, the following will occur: a. LED flashes a status code 4 times. R[...]

  • Page 8

    Fig. 11—Furnace Control A99255 HUMIDIFIER TERMINAL (24-V AC 0.5 AMP MAX) LED OPERA TION & DIAGNOSTIC LIGHT HARNESS CONNECT OR 24-V TRANSFORMER SEC-2 SP ARE-1 SP ARE-2 EAC-1 EAC-ELECTR ONIC AIR CLEANER TERMINALS (115-V AC 1.0 AMP MAX) EAC-2 115-V AC (L2) NEUTRAL CONNECTION 24-V THERMOST A T TERMINALS BLOWER SPEED SELECTION TERMINALS INDUCER MO[...]

  • Page 9

    → Fig. 12—Furnace Wiring Diagram A00304 PCB BLOWER OFF DELAY SELECTION CHART 90 SEC 135 SEC 180 SEC 225 SEC GVR H I/L O RELA Y SEC-1 SEC-2 PL1 3 2 1 6 5 4 9 87 LED TEST/TWIN BLOWER OFF DELAY G R Y W C HUM HSI R I DR BLWR BLOWER SPEED SELECT FU1 COOL HEA T L2 PL3 PL2 VAC 120 L1 PR1 1 2 1 2 3 PR2 24 VAC -3A FUSE SP A RE-2 SP ARE-1 EAC-1 EAC-2 C 1[...]

  • Page 10

    Fig. 13—Service Label A96263 SERVICE 11 NO PREVIOUS CODE - Stored sta tus codes are er ased when power (115 V or 24V) to control is interrupted or 48 hours after ea ch fault is cl eared. 12 BLOWER ON AFTER POWER UP ( 115V or 24V) - Blower ru ns for 90 seconds, if unit is power ed up duri ng a call for hea t (R-W closed). 13 LI MIT OR FLAM E ROLL-[...]

  • Page 11

    —11—[...]

  • Page 12

    Is circuit breaker closed? Close door switch and go to start. Is red LED status light on? Is door switch closed? Is red LED status light blinking rapidly without a pause? Is there 1 15v going to switch? Replace door switch. Replace control center . Replace transformer . Is red LED status light blinking ON/OFF slowly with a combination of short and [...]

  • Page 13

    11 NO PREVIOUS F AUL T - Faults are erased after 48 hrs or whenever power (1 15v or 24v) is interrupted. Run system through a heating or cooling cycle to check system. 12 BLO WER ON AFTER PO WER UP (115V OR 24V) - Normal operation. Blower will run for 90 sec when furnace power is interrupted during a call for heat, R-W closed. 13 LIMIT OR FLAME ROL[...]

  • Page 14

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  • Page 15

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  • Page 16

    A94328 SERVICE TRAINING Packaged Service Training programs are an excellent way to increase your knowledge of the equipment discussed in this manual, including: • Unit Familiarization • Maintenance • Installation Overview • Operating Sequence A large selection of product, theory, and skills programs is available, using popular video-based f[...]