XTBC1
A-
A+
14
13
50
13
21
13
20
13
19
13
18
13
51
13
INTERNAL WIRING TO OPTIONAL REMOTE TEMP. RESET BOARD
FLOW SWITCH
REMOTE UNLOAD STEP 1
PWM REMOTE TEMP RESET
INTERNAL WIRING TO 2-KCR CONTROL RELAY
INTERNAL WIRING TO 1-KCR CONTROL RELAY
REMOTE START / STOP
XTBC2
140
123
32
31
30
29
28
27
26
25
24
23
5
L
2
2
2
GND
INTERNAL WIRING TO EVAPORATOR HEATER
INTERNAL 120 VAC WIRING TO F1 FUSE
INTERNAL 120 VAC WIRING (TYPICALLY FROM CONTROL TRANSFORMER)
INTERNAL NEUTRAL WIRING
INTERNAL NEUTRAL WIRING
INTERNAL NEUTRAL WIRING (TYPICALLY FROM CONTROL TRANSFORMER)
INTERNAL WIRING TO HOT GAS SOLENOID VALVE
SYSTEM 2 ALARM DRY CONTACTS (OPEN = ALARM)
SYSTEM 2 RUN DRY CONTACTS (CLOSE = RUN)
SYSTEM 1 RUN DRY CONTACTS (CLOSE = RUN)
EVAPORATOR PUMP DRY CONTACTS (CLOSE = RUN
BASED ON DAILY SCHEDULE)
SYSTEM 1 ALARM DRY CONTACTS (OPEN = ALARM)
Normally jumpered.
Can be used as
EMERGENCY STOP
contacts from an
external source.
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