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NO
YES
END OF COOLING TEST
CHECK UNIT WIRING AND IF CORRECT
REPLACE THE VSP1.
NO
YES
IS BLOWER ON HIGH
SPEED COOLING TAP?
ARE DS1 AND DS3
LIT?
IN ADDITION TO R AND G, JUMPER R AND DS.
IS BLOWER ON LOW SPEED COOLING TAP
AND IS DS1 LIT?
CHECK UNIT WIRING AND IF CORRECT,
REPLACE VSP1.
PLACE JUMPER ACROSS R AND G.
TB2
NO
YES
CHECK VOLTAGE ON TB2 FROM ACC TO N ON TERMINAL
BLOCK INSIDE CONTROL BOX−SHOULD READ "120" VOLTS AC
ACC N
IS THE ACCESSORY
RELAY PULLED IN?
120VAC?
CHECK UNIT WIRING FROM VSP1 TO TB2
AND IF CORRECT, REPLACE VSP1.
DS3 DS2 DS1
DS3 DS2 DS1
DS3 DS2 DS1
VSP1
L1
ACC
DOES UNIT OPERATE?
YES
NO
YES
CHECK OUT ELECTRONICALLY CONTROLLED BLOWER MOTOR AND VSP1
SEE SECTION VIIINEW UNIT STARTUP
IS 24VAC ACROSS R AND C ?
IS 24VAC ACROSS J73
PIN 8 AND 1
OF VSP1?
NO
CHECK:
1−UNIT POWER
2−INTERLOCK SWITCH
3−TRANSFORMER
4−TRANSFORMER FUSE
5−UNIT WIRING
IS 24VAC ACROSS J73
PIN 7 AND 1
OF VSP1?
NO
PRIMARY LIMIT S10 IS NC
ALLOW UNIT TO COOL
IF LIMIT REMAINS OPEN
REPLACE LIMIT
YES
IS 24VAC ACROSS J73
PIN 3 AND 1
OF VSP1?
NO REPLACE VSP1
YES
NO
CHECK WIRING BETWEEN TB1 AND VSP1
REPAIR IF NECESSARY
YES
1
3
6912
J73
J73
1
V" BLOWER AND VSP1 BLOWER CONTROL BOARD COOLING MODE CHECKOUT
START
HERE
START HERE
1
1
3
6912
J73
WARNING
Disconnect thermostat wire to DS terminal before
performing any test on this page.
W1
W2
R
GY1 Y2
DS
C
HB
TB1 TERMINAL STRIP
DISCONNECT DS
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