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Service and
393AAV
Series B&C
Maintenance Procedures
GAS-FIRED
INDUCED-COMBUSTION FURNACE
Cancels: SP04-58 SP04-61
10-00
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS .....................................................1
INTRODUCTION..........................................................................2
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PRO-
CEDURE ...................
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CAUTION: Label all wires prior to disconnection when WARNING: Never store anything on, near, or in contact servicing controls. Wiring errors can cause improper and with furnace, such as: dangerous operation. 1. Spray or aerosol cans, rags, brooms, dust mops, vacuum cleaners, or other cleaning tools. 2. Soap powders, bleaches, waxes or other cleaning compounds, plastic or plastic containers, gasoline, kero- sene, cigarette lighter fluid, dry cleaning fluids, or other volatile fluids. 3. Paint thi
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b. Remove filter cabinet door. a. Mark blower wheel location on shaft before disassembly to ensure proper reassembly. c. Slide filter out of cabinet. b. Loosen setscrew holding blower wheel on motor shaft. d. If equipped with permanent, washable filter, clean filter by spraying cold tap water through filter in opposite NOTE: Mark blower mounting arms, motor, and blower housing direction of airflow. Rinse filter and let dry. Oiling or so motor and each arm is positioned at the same location durin
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13 11 32" 32" WARNING: Blower access door switch opens 115-v BURNER power to control center. 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. CELL PANEL NOTE: If thermostat terminals are jumpered before blower ac- cess door switch is closed, blower will run for 90 sec before HOT beginning a heating or cooling cycle. SURFACE IGNITOR 14. If fu
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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 C GND SUPPLIED L NOTE 1 DISCONNECT CONDENSING Y UNIT TWO 24-V WIRE TERMINAL BLOCK NOTES: 1. Connect Y-terminal in furnac
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BLOWER OFF DELAY ADJUSTMENT SWITCH 24V THERMOSTAT G TERMINALS R Y W TEST/TWIN HUMIDIFIER TERMINAL COM 24V (24-VAC 0.5 AMP MAX) HUM LED OPERATION & STATUS LIGHT HARNESS CONNECTOR SEC-1 24V TRANSFORMER SEC-2 3-AMP FUSE SPARE 1 COOL BLOWER SPEED HEAT SELECTION TERMINALS SPARE 2 EAC 1 (BLACK) EAC-ELECTRONIC AIR CLEANER TERMINALS (115-VAC 1.0 AMP MAX) 115-VAC (L1) EAC 2 (WHITE) POWER 115-VAC (L2) NEUTRAL SUPPLY CONNECTION HOT SURFACE INDUCER MOTOR IGNITER CONNECTOR CONNECTOR A99258 Fig. 6—Furnace Con
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—7— (WHEN USED) (WHEN USED) TO 115VAC FIELD DISCONNECT SCHEMATIC DIAGRAM SW2 G NOTE #14 NOTE #11 (WHEN USED) BLOWER (NATURAL GAS & PROPANE) L1 L2 DSS BVSS ALS PRS R LGPS OFF PCB NOTE #9 NOTE #4 EQUIPMENT GROUND Y DELAY ORN ORN ORN ORN SW1 ORN (NOT ON ALL MODELS) W L2 ILK LO COM BLOWER OFF DELAY SPARE-2 MED LO SELECTION CHART YEL HUM HEAT MED HI NOTE #13 NOTE #14 TEST/TWIN HI 90 SEC START SPARE-1 HI/LO OL L1 NOTE #7 LED BLWR 135 SEC COOL BLU LS CAP NOTE #15 180 SEC COM COM RED BLWM EAC-1 PL1 3 1
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TEST LED 1 32 6 5 4 9 8 7 SERVICE If status code recall is needed, do not remove power or blower door. Briefly remove and then reconnect one main limit wire to display stored status code. LED CODE STATUS CONTINUOUS OFF - Check for 115VAC at L1 and L2, and 24VAC at SEC-1 and SEC-2. CONTINUOUS ON - Control has 24VAC power. RAPID FLASHING - Line voltage (115VAC) polarity reversed. If twinned, refer to twinning kit instructions. EACH OF THE FOLLOWING STATUS CODES IS A TWO DIGIT NUMBER WITH THE FIRST
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4. If furnace is operating properly and LED indicates proper e. Component Test will function as described in item 2 operation, replace control access door. above. f. Check LED status. 5. Component Test can also be initiated by performing the following: g. If LED status indicates proper operation, RELEASE a. Remove control access door. BLOWER ACCESS DOOR SWITCH, replace blower access door, and replace control access door. b. Remove blower access door. c. Manually close blower access door switch.
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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 Check for correct line voltage brea
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—11— 31 PRESSURE SWITCH WILL NOT CLOSE OR REOPEN - If 11 NO PREVIOUS FAULT - Faults open longer than 5 minutes, Unplug ignitor harness from control are erased after 48 hrs or inducer shuts off for 15 minutes center and inititate another whenever power (115v or 24v) is before retry. component test sequence. Check NO Replace control center. interrupted. Run system through Check for: for 115v between pins 1 and 2 on a heating or cooling cycle to • Proper vent sizing or pitch or the control center
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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 increas
