JOHNSON CONTROLS
43
SECTION 4 – INSTALLATION
FORM 150.72-ICOM7
ISSUE DATE: 10/22/2020
4
FIGURE 12 - CONTROL WIRING OUTPUTS
USER CONTROL WIRING OUTPUTS
LD13242
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.
All chiller supplied contacts are rated at
110 VAC, 100 VA, resistive load only, and
must be suppressed at the load by user
if powering an inductive load (Relay /
Contactor Coil). Typical suppressor P/N
is 031-00808-000.
The unit evaporator heater uses 110 VAC.
Disconnecting 120 VAC power from the
unit, at or below freezing temperatures,
can result in damage to the evaporator
and unit as a result of the chilled liquid
freezing.
It is possible that multiple sources of
power can be supplying the unit power
panel. To prevent serious injury or death,
the technician should verify that NO
LETHAL VOLTAGES are present inside
the panel AFTER disconnecting power,
BEFORE working on equipment.
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