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service and
350MAV
Series G
maintenance procedures
4-WAY MULTIPOISE
FIXED-CAPACITY DIRECT-VENT
CONDENSING GAS FURNACE
Cancels: SP05-47 SP05-52
8-02
WARNING: ELECTRICAL SHOCK, FIRE,
OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in
dangerous operation, serious injury, death, or property
damage.
Improper servicing could result in dangerous operation,
serious indury, death, or property damage.
Before servicing, disconnect all electrical power to fur-
nace.
When servicing
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R E G n I I o S i S t O a T r 9 o E 0 p 0 r R 1 CSA B149.1-00 (NSCNGPIC) in Canada; and the Installation ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS Standards, Warm Air Heating and Air Conditioning Systems CAUTION: Electrostatic discharge can affect electronic (NFPA 90B) ANSI/NFPA 90B. In Canada, refer to the components. Take precautions during furnace installation CAN/CGA-B/49.1- and .2-M95 National Standard of Canada, and servicing to protect the furnace electronic control. Natural Gas and Propa
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WASHABLE FILTER IN FURNACE FILTER RETAINER WASHABLE FILTER FILTER SUPPORT FILTER RETAINER WASHABLE FILTER OR DISPOSABLE MEDIA WASHABLE FILTER OR FILTER IN FILTER CABINET DISPOSABLE MEDIA FILTER IN FILTER CABINET A00233 Fig. 4—Filter Installed for Side Inlet A00232 Fig. 3—Bottom Filter Arrangement If filter is installed in filter cabinet adjacent to furnace: WARNING: Turn off the gas and electrical supplies to 1. Turn off electrical supply to furnace. the unit before performing any maintenance or
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1. Turn off electrical supply to furnace. (2.) Connect 1 tube (violet or unmarked) from inducer housing. 2. Remove main furnace door and blower access panel. (3.) Connect 1 tube (relief port, green or pink) from 3. Disconnect blower motor wires from furnace control. collector box. Field thermostat connections may need to be disconnected depending on their length and routing. c. Connect field drain to condensate trap. 4. Remove control box mounting screws, and position control 13. Reconnect wires
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7. Remove screws that secure manifold to burner box. (See WARNING: FIRE OR EXPLOSION HAZARD Fig. 5.) Failure to follow the safety warnings exactly could result NOTE: Do not remove burner box from cell panel. in serious injury, death, or property damage. Never test for gas leaks with an open flame. Use a 8. Remove manifold, orifices, and gas valve as 1 assembly. commercially available soap solution made specifically for the detection of leaks to check all connections. A fire 9. Remove screws atta
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PRIMARY HX WARNING: FIRE OR EXPLOSION HAZARD INLET OPENINGS Failure to follow the safety warnings exactly could result in serious injury, death, or property damage. Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections. A fire or explosion may result causing property damage, per- sonal injury, or loss of life. 17. Check for gas leaks. 18. Replace main furnace door. B. Secondary Heat Exchangers
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14. Check furnace operation through 2 complete heat operating 2. Remove main furnace door. cycles. Check area below inducer housing, vent pipe, and 3. Disconnect igniter wire connection. condensate trap to ensure no condensate leaks occur. If leaks are found, correct the problem. 4. Check igniter resistance. a. Using an ohm meter, check resistance across both igniter WARNING: FIRE OR EXPLOSION HAZARD leads in connector. Failure to follow the safety warnings exactly could result b. Cold reading s
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box or inlet pipe, but can be removed without removing 8. Turn on gas and electrical supplies to furnace. either. After removing screw, slide igniter and bracket 9. Verify igniter operation by initiating furnace control self- toward outside of burner box and pull straight out. test feature or by cycling thermostat. 10. Replace main furnace door. CAUTION: The igniter is fragile. DO NOT allow it to hit the side of the burner box opening while removing or VII. ELECTRICAL CONTROLS AND WIRING replaci
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FIELD 24-V WIRING FIELD 115-, 208/230-, 460-V WIRING FACTORY 24-V WIRING FACTORY 115-V WIRING NOTE 2 THERMOSTAT WC R G Y FIVE WIRE FIELD-SUPPLIED TERMINALS DISCONNECT THREE-WIRE HEATING-ONLY 208/230- OR BLOWER DOOR SWITCH 460-V THREE PHASE W BLK BLK C R WHT WHT O N 208/230-V T SINGLE GND GND G R PHASE AUXILIARY 115-V FIELD- O J-BOX COM SUPPLIED GND L NOTE 1 DISCONNECT CONDENSING Y/Y2 UNIT TWO 24-V WIRE TERMINAL BLOCK NOTES: 1. Connect Y-terminal in furnace as shown for proper blower operation. F
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L1 PLT 120 180 PLT 1 90 150 NUETRAL BLW Y1 DHUM G COM W/W1 Y/Y2 R STATUS CODE LED COOL HEAT 24V TWINNING AND/OR COMPONENT TEST BLOWER OFF-DELAY TERMINAL BLOWER OFF-DELAY HUMIDIFIER TERMINAL (24-VAC 0.5 AMP MAX.) 24-V THERMOSTAT TERMINALS TRANSFORMER 24-VAC CONNECTIONS TEST/TWIN HUM 0.5 AMP@24VAC 3-AMP FUSE FUSE 3-AMP SEC-2 SEC-1 LED OPERATION & EAC-2 L2 DIAGNOSTIC LIGHT PL1-LOW VOLTAGE MAIN HARNESS CONNECTOR 115-VAC(L2)NEUTRAL CONNECTIONS COOL
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A99118 Fig. 14—Inducer Housing Drain Tube A99119 Fig. 15—Funnel in Drain and Antifreeze Running Through Trap —11—
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PRINTED CIRCIUT BOARD PRINTED CIRCIUT BOARD A02157 —12— TO 115VAC FIELD DISCONNECT (WHEN USED) SCHEMATIC DIAGRAM BLOWER OFF DELAY LGPS PRS NOTE #2 (NATURAL GAS & PROPANE) JUMPER SELECT L2 PCB L1 GND EQUIPMENT GROUND Y1 ORN 90 DHUM LO CAP-1 ILK FAN 120 MED LO NOTE #11 G 150 HEAT MED HI YEL Com L1 HI 24V 180 BLU BLU FAN START SPARE-1 NOTE #10 L2 OL W J1 HI/LO BLWR GV M COOL EAC-2 RED RED Y/Y2 TEST/TWIN BLWM ORN LS FRS COM R C EAC-1 GRN/YEL HUM HSIR NOTE #3 FU1 RED NOTE #6 GRN/YEL 1HSI 1 IDR ID
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SERVICE If status code recall is needed, briefly remove then reconnect one main limit wire to display stored status code. On RED LED boards do not remove power or blower door before initiat- ing status code recall. After status code recall is completed component test will occur. LED CODE STATUS CONTINUOUS OFF - Check for 115VAC at L1 & L2, & 24VAC at SEC-1 & SEC-2. CONTINUOUS ON - Control has 24VAC power. RAPID FLASHING - Line voltage (115VAC) polarity reversed. If twinned, refer to twinning
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—14— TROUBLESHOOTING GUIDE START NO NO NO Is LED status light on? Is there 115V at L1 and L2? Is door switch closed? Close door switch and go back to START. YES YES YES NO NO Is there 24V at SEC-1 and SEC-2? Is there 115V going to switch? Is circuit breaker closed? YES YES YES NO Replace furnace control. Replace door switch. Check for continuity in wire from circuit breaker to furnace. Check for correct line voltage polarity. If units YES Replace transformer. Close circuit breaker and go back t
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—15— 11 NO PREVIOUS CODE – Stored codes 31 PRESSURE SWITCH DID NOT CLOSE 45 CONTROL CIRCUITRY LOCKOUT are erased after 72 hours. On RED LED OR REOPENED – If open longer than 5 Auto-reset after 1 hour lockout due to: minutes, inducer shuts off for 15 minutes boards stored status codes can also be - Flame circuit failure. before retry. If opens during blower on- erased whenever power (115V or 24V) - Gas valve relay stuck open. delay period, blower will come on for the is interrupted. Run system
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© 2002 Bryant Heating & Cooling Systems 7310 W. Morris St. Indianapolis, IN 46231 Printed in U.S.A. sp0558 Catalog No. 5335-207 —16—
