Service Bulletin Index - Johnstone Supply

CAUTION! FOLLOW DIRECTIONS BEFORE APPLYING POWER
POWER SUPPLY L1 AND L2 AT UNIT CONTACTOR MUST BE IN-PHASE WITH POWER SUPPLY L1 AND L2 AT ELECTRIC HEAT KIT OR DIRECT SHORT
WILL OCCUR. THESE DIRECTIONS ARE FOR UNITS WITH ELECTRIC HEAT KITS SUPPLIED WITHOUT CIRCUIT BREAKER(S). SEE REVERSE FOR
ELECTRIC HEAT KITS WITH CIRCUIT BREAKERS.
WARNING
HIGH VOLTAGE!
Disconnect ALL power before servicing. Multiple power sources may be present.
Failure to do so may cause property damage, personal injury or death.
Technical Services Department • 1810 Wilson Parkway • Fayetteville, TN 37334
Main: 888.593.9988 • Service Fax: 931.438.2273
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Is a trademark of Maytag Corporation and is used under license to Goodman Company, L.P.
All rights reserved.
SP-004
1. TURN OFF POWER SUPPLY BREAKER AT HOUSE.
2. AT HEAT KIT POWER TERMINAL BLOCK, NOTE POSITION OF RED WIRE THAT CONNECTS TO PLUG PIN #2 (PLUG IS SHOWN IN PHOTO ON
REVERSE SIDE.) THE RED WIRE CONNECTS TO L2 AT THE TERMINAL STRIP.
3. REMOVE RED WIRE FROM TERMINAL STRIP AND TAPE END TO INSULATE AND PREVENT SHOCK AND/OR SHORT
4. CONNECT POWER TO L1 AND L2 AT UNIT CONTACTOR AND HEAT KIT POWER TERMINAL BLOCK. (SEPARATE OVER-CURRENT PROTECTION
MUST BE SUPPLIED FOR EACH POWER SOURCE.)
5. TURN ON POWER SUPPLY BREAKER AT HOUSE.
6. USING A VOLT METER, CHECK FOR VOLTAGE BETWEEN L2 AT THE UNIT CONTACTOR AND L2 AT THE HEAT KIT POWER TERMINAL BLOCK.
(SEE CONTROL BOX PHOTO ON REVERSE SIDE FOR CONTACTOR LEAD ORIENTATION.)
7. IF THE POWER SUPPLIES ARE IN-PHASE, THERE WILL BE NO VOLTAGE BETWEEN UNIT CONTACTOR L2 AND HEAT KIT POWER TERMINAL
BLOCK L2.
8. IF THERE IS NO VOLTAGE, THEN THE POWER SUPPLIES ARE IN-PHASE AND THE UNIT IS WIRED CORRECTLY. SKIP TO STEP 12.
9. IF THE POWER SUPPLIES ARE NOT IN-PHASE, THERE WILL BE LINE VOLTAGE READ BETWEEN L2 AT UNIT CONTACTOR AND L2 AT HEAT KIT
POWER TERMINAL BLOCK.
10. IF A VOLTAGE IS PRESENT, TURN OFF POWER AT HOUSE BREAKER.
11. SWAP LINES L1 AND L2 AT UNIT CONTACTOR.
12. REPEAT STEPS 4-7 ABOVE. VOLTAGE SHOULD BE ZERO.
13. AFTER VERIFYING THAT THERE IS NO VOLTAGE BETWEEN L2 AT UNIT CONTACTOR AND L2 AT HEAT KIT POWER TERMINAL BLOCK WITH
SOURCE POWER ON, TURN OFF POWER AT HOUSE AGAIN, AND RE-CONNECT RED WIRE TO HEAT KIT POWER TERMINAL BLOCK AT L2.
14. TURN POWER BACK ON. UNIT IS NOW WIRED CORRECTLY.
15. IF POWER SUPPLIES ARE NOT IN-PHASE, A DIRECT SHORT WILL OCCUR AND BREAKER(S) WILL TRIP. IF THIS OCCURS, TURN OFF MAIN
POWER AND CHECK FOR DAMAGE TO ELECTRICAL COMPONENTS AND WIRES. IF NONE IS FOUND, REPEAT STEPS ABOVE TO CHECK POWER
SUPPLY PHASING.
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