Form No. Z2288
CLOSE
@ 25° F
OPEN
@ 40° F
ON DELAY
RELAY
RELAY
S.S. TIMER
WHITE
WHITE
WHITE
WHITE
NORM. CLOSED
HOT GASS DEFROST
SOLENOID
CONDN
FAN
A2 (RED)
BLACK
BLACK
B (POWER)
TO CONDENSING
UNIT
PLUG-IN-CORD
BLUE
LIGHT
SWITCH
TEMPERATURE
CONTROL
DOOR
SWITCH
S.S.S.T MOMENTARY
CONTACT DEFROST SWITCH
W/INDICATOR LIGHT
RELAY
1
12
B W A1
A1
A
B2
B1
T11
T12
T13
T15 T14
2
3
3
4
4
56
2
DEFROST
TEMP. LIMIT
SWITCH
INTERNAL
CONNECTIONS
BLACK
3
RED
DEFROST CYCLE:
1) AFTER 220 MINUTES:
-A2 OPENS.
-B1 CLOSES.
-HOT GAS VALVE OPENS.
-ON DELAY RELAY CONTACT CLOSES
TO 2 IN 3 MINUTES.
-THERMOSTATE IS BYPASSED.
-COMPRESSOR RESTARTS AFTER 3
MINUTES FOR HOT GAS DEFROST.
2) LIMIT SWITCH OPENS AT 40° F:
-COMPRESSOR OFF.
-HOT GAS REMAINS ENERGIZED.
3) AFRT 20 MINUTES:
-B1 OPENS.
-HOT GAS VALVE IS DE-ENERGIZED.
-A2 CLOSES.
-COMPRESSOR STARTS THROUGH
TEMPERATURE CONTROL.