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Some thermostats require a "C" terminal connection as shown. G R G Y1 C GND GND GND GND GND GNDY2 Y1 C WHT BLK WHT BLK R W2 COM W/W1 Y/Y2 NOTES: 1. Connect Y-terminal as shown for proper operation. 3. If any of the original wire, as supplied, must be replaced, use same type or equivalent wire. A99072 Fig. 10—Heating and Cooling Application Wiring Diagram for 2-Stage Thermostats and/or 2-Speed Condensing Units flashing, or a code composed of 2 digits. (The first digit is the number of short flashes, the second is the number of longs flashes.) Refer to service label on blower compartment door for code explanations and useful troubleshooting suggestions. (See Fig. 12.) It is important to note that power to furnace must not be interrupted and furnace blower door must not be removed until the LED status code(s) is recorded. When power to control is interrupted, status memory is erased. The control will store up to 5 previous codes but will not store non-current codes longer than 48 hr. To retrieve previous codes, if present, no thermostat inputs to control must be present and all time delays must expire. Remove 1 of the red main limit wires 1 to 4 sec until the LED light goes out, then reconnect it. (See Fig. 5 and 6.) (Do not leave red wire disconnected for longer than 4 sec as control will assume an overtemperature condition exists and will respond with indoor blower operation.) This places control in status recall mode and displays first code stored in memory. Record code and repeat the disconnect and reconnect of red wire, recording each code until code 11 is displayed indicating no additional faults. After last code is displayed or after 2 minutes in the code recall mode, the control will return to normal standby mode. Use any recorded fault codes, service label, and troubleshooting diagram on following pages to diagnose and correct any problem condition. WIRING DIAGRAMS Refer to Fig. 9, 10, and 11 for appropriate wiring diagrams. TROUBLESHOOTING Refer to service label. (See Fig. 12.) The Troubleshooting Guide can be a useful tool in isolating furnace operation problems. Beginning with the word “Start,” answer each question and follow the appropriate arrow to the next item. The Guide will help you identify the problem or failed component. After replacing any component, verify correct operation sequence. More information is available in a seperate Troubleshooting Guide for 2-stage Gas-Fired Induced-Combustion Furnaces. —7— —8— LEGEND ALS1 AUXILIARY LIMIT SWITCH, OVERTEMP. MANUAL RESET, SPST ( N. C. ) ALS2 AUXILIARY LIMIT SWITCH, OVERTEMP. AUTO RESET, SPST ( N. C. ) BHI / LOR BLOWER MOTOR SPEED CHANGE RELAY, SPDT BHT / CLR BLOWER MOTOR SPEED CHANGE RELAY, SPDT BLWM BLOWER MOTOR, 4 or 5 - SPEED, PERMANENT- SPLIT-CAPACITOR BLWR BLOWER MOTOR RELAY, SPST ( N. O. ) CAP CAPACITOR CPU MICROPROCESSOR AND CIRCUITRY DSS DRAFT SAFEGUARD SWITCH ( N. C. ) EAC- 1 ELECTRONIC AIR CLEANER CONNECTION ( 115 VAC, 1 AMP MAX. ) EAC- 2 ELECTRONIC AIR CLEANER CONNECTION ( COMMON) FRS1 FLAME ROLLOUT SWITCH OVERTEMP. MANUAL RESET, SPST (N.C.) FRS2 FLAME ROLLOUT SWITCH OVERTEMP. MANUAL RESET, SPST (N.C.) FSE FLAME- PROVING SENSOR ELECTRODE FU1 FUSE, 3 AMP, AUTOMOTIVE BLADE TYPE, FACTORY INSTALLED FU2 FUSE, FIELD INSTALLED GV GAS VALVE, REDUNDANT LOW- HEAT OPERATORS, 2- STAGE HPS HIGH- HEAT PRESSURE SWITCH, SPST ( N. O. ) HPSR HIGH- HEAT PRESSURE SWITCH RELAY, SPST ( N. C. ) HSI HOT- SURFACE IGNITER ( 115 VAC) HSIR HOT- SURFACE IGNITOR RELAY, SPST ( N. O. ) HUM 24VAC HUMIDIFIER CONNECTION ( 0.5 AMP. MAX. ) IDM INDUCED DRAFT MOTOR, 2- SPEED, SHADED- POLE IDR INDUCER MOTOR RELAY, SPST ( N. O. ) IHI / LOR INDUCER MOTOR SPEED CHANGE RELAY, SPDT ILK BLOWER DOOR INTERLOCK SWITCH, SPST ( N.O.) JB JUNCTION BOX LED LIGHT- EMITTING DIODE FOR STATUS CODES LGPS LOW GAS- PRESSURE SWITCH, SPST ( N. O. ) LPS LOW- HEAT PRESSURE SWITCH, SPST ( N. O. ) LS LIMIT SWITCH, OVERTEMPERATURE- AUTO RESET, SPST ( N. C. ) MGVR MAIN GAS VALVE RELAY, DPST ( N. O. ) - 1 = VALVE -2 = HUMIDIFIER PL1 12- CIRCUIT CONNECTOR PL2 9- CIRCUIT CONNECTOR PL3 3- CIRCUIT IDM CONNECTOR PL6 2- CIRCUIT HSI CONNECTOR SW1 HIGH- HEAT- ONLY SWITCH, SPST ( MANUAL) * SW2 LOW- HEAT- ONLY SWITCH, SPST ( MANUAL) * SW3 & 4 BLOWER- OFF DELAY SETTING SWITCHES, SPST ( MANUAL) * TJ TWINNING JUMPER, SPDT FOR MAIN OR SECONDARY STATUS ( MANUAL CHANGE OVER) TRAN TRANSFORMER- 115VAC/ 24VAC TWIN/TEST 1- CIRCUIT TWINNING BUSS CONNECTOR, ALSO STATUS CODE RECALL JUNCTION TERMINAL CONTROL TERMINAL FACTORY POWER WIRING ( 115VAC) FACTORY CONTROL WIRING ( 24VAC) FIELD POWER WIRING ( 115VAC) FIELD CONTROL WIRING ( 24VAC) CONDUCTOR ON CONTROL FIELD WIRING SCREW TERMINAL FIELD GROUND EQUIPMENT GROUND FIELD SPLICE PLUG RECEPTACLE NOTES: 1. Use only copper wire between the disconnect switch andthe unit. 2. If any of the original wire, as supplied, must be replaced, use the same or equivalent type wire. 3. Inducer ( IDM) and blower ( BLWM) motors contain internal auto- reset thermal overload switches. 4. Blower mot...

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