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CANADIAN GAS ASSOCIATION
service and
373LAV
383KAV
maintenance procedures
GAS-FIRED
Series G
INDUCED-COMBUSTION FURNACES
Cancels: SP04-44 SP04-53
9-98
SAFETY CONSIDERATIONS
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 45,000 through 155,000 Btuh input
units.
Index Page
SAFETY CONSIDERATIONS..................................................1-2
A94087
ELECTROSTATIC DIS
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WARNING: The ability to properly perform mainte- WARNING: Never store anything on, near, or in contact nance on this equipment requires certain expertise, me- with the furnace, such as: chanical skills, tools, and equipment. If you do not 1. Spray or aerosol cans, rags, brooms, dust mops, possess these, do not attempt to perform any maintenance vacuum cleaners, or other cleaning tools. on this equipment other than those procedures recom- 2. Soap powders, bleaches, waxes or other cleaning mended
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g. Replace blower access door. h. Restore electrical power to furnace. 2. Upflow Each furnace requires 1 or 2 filters which are installed in the blower compartment. (See Fig. 6.) To remove filters for cleaning or replacement, proceed as follows: a. Disconnect electrical power before removing access AIRFLOW doors. b. Remove blower and control access doors. c. Release filter retainer from clip at front of furnace casing. (See Fig. 6.) For side return, clips
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HUM COM 24V W Y R G COM W Y R G 24V VENT PIPE BLOCKED ENCLOSURE MOUNTING VENT SCREWS AUXILIARY SAFEGUARD LIMIT SWITCH (WHEN USED) RELIEF BOX FLUE CONTROL MOUNTING COLLECTOR BOARD SCREWS BOX CONTROL BLOCKED VENT SAFEGUARD RELIEF BOX FILTER RETAINER MANUAL RESET LIMIT WASHABLE SWITCHES FILTER A98528 A98529 → Fig. 6—Model 383KAV Upflow → Fig. 7—Model 373LAV Downflow a. Remove dust caps or plugs from oil ports located at each 20. Turn on electrical power and check for proper rotation and
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(2.) Use 1/4-in. diameter wire brush (commonly known CAUTION: Be very careful when removing the burner as 25-caliber rifle cleaning brush). assembly to avoid breaking the ignitor. See Fig. 9 for the NOTE: The materials needed in items (1.) and (2.) can usually be correct ignitor location. purchased at local hardware stores. (3.) Insert twisted wire end of brush into end of steel spring cable, and crimp tight with crimping tool or (5.) Replace screws in center panel and cells before strike with b
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The electrical ground and polarity for 115-v wiring must be d. Main blower operates at cooling speed for 10 sec, then maintained properly. Refer to Fig. 10 for field wiring information turns off. and to Fig. 12 for unit wiring information. e. Main blower operates at heating speed for 10 sec, then NOTE: If the polarity is not correct, the STATUS LED on the turns off. control center will flash rapidly and prevent the furnace from f. Inducer motor stops. operating. The control system also requires
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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 FIELD-SUPPLIED TERMINALS WIRE DISCONNECT THREE-WIRE 208/230- OR HEATING- 460-V ONLY THREE PHASE W BLK BLK R WHT WHT 208/230-V SINGLE GND GND G PHASE AUXILIARY 115-V J-BOX C GND FIELD-SUPPLIED NOTE 1 CONTROL DISCONNECT CONDENSING Y BOX UNIT TWO 24-V WIRE TERMINAL BLOCK NOTES: 1. Connect Y-terminal as shown for proper operation. FURNA
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—8— TO 115VAC FIELD DISCONNECT (WHEN USED) (WHEN USED) SCHEMATIC DIAGRAM SW2 G NOTE #14 (WHEN USED) NEUTRAL NOTE #11 BLOWER NOTE #4 R L1 (NATURAL GAS & PROPANE) PCB DSS BVSS ALS PRS NOTE #9 OFF LGPS Y EQUIPMENT GROUND DELAY W (NOT ON ALL MODELS) SW1 ORN ORN ORN L2 ORN ORN ILK COM LO BLOWER OFF DELAY SPARE-2 HUM MED LO SELECTION CHART HEAT YEL MED HI HI 90 SEC TEST/TWIN NOTE #13 NOTE #14 START SPARE-1 L1 HI/LO OL LED NOTE #7 BLWR 135 SEC COOL BLU LS CAP 180 SEC COM COM RED BLWM 1-M 3-P PL1 EAC-1
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TEST STATUS 2 3 1 6 4 5 9 8 7 SERVICE LED CODE STATUS CONTINUOUS OFF - Check for 115VAC at L1 and L2, and 24VAC at SEC-1 and SEC-2. CONTINUOUS ON - Control has 24V power. RAPID FLASHING - Line voltage (115V) polarity reversed. If twinned, refer to twinning kit instructions. EACH OF THE FOLLOWING STATUS CODES IS A TWO DIGIT NUMBER WITH THE FIRST DIGIT DETERMINED BY THE NUMBER OF SHORT FLASHES AND THE SECOND DIGIT BY THE NUMBER OF LONG FLASHES. 11 NO PREVIOUS CODE - Stored status codes are erased
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—10— TROUBLESHOOTING GUIDE START NO NO NO Is red LED status light on? Is there 115v at L1 and L2? Is door switch closed? Close door switch and go to start. YES YES YES NO NO NO Is there 24v at SEC-1 and SEC-2? Is there 115v going to switch? Is circuit breaker closed? YES YES YES Replace control center. Replace door switch. Close circuit breaker and
go back to start. Replace transformer. Check for continuity in wire from circuit
Is red LED status light blinking
YES Check for correct line volt
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—11— 31 PRESSURE, DRAFT
Unplug ignitor harness from control
11 NO PREVIOUS FAULT - Faults
SAFEGUARD (WHEN USED),
center and inititate another
are erased after 48 hrs or
OR AUXILIARY LIMIT (WHEN
component test sequence and check
NO whenever power (115V or 24V)
Replace control board. USED) SWITCH WILL NOT
for 115v between pins 1 and 2 on
is interrupted. Run system
CLOSE OR REOPEN - If open
the board. Was there 115v present
through a heating or cooling
longer than 5 minutes, i
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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 formats and materials. All include video and/or slides, plus companion book.
Classroom Service Training plus "hands-on" the products in our labs can mean
