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JOHNSON CONTROLS
41
SECTION 4 – INSTALLATION
FORM 150.73-NM1
ISSUE DATE: 09/04/2020
4
XTBC1
51
13
13
50
21
13
20
13
PWM INPUT (CAN ONLY BE USED WITH DISCHARGE AIR
TEMP CONTROL)
SYSTEM 2 THERMOSTAT (SUCTION PRESSURE CONTROL ONLY)
(JUMPER FOR DISCHARGE AIR TEMP CONTROL)
SYSTEM 1 THERMOSTAT (SUCTION PRESSURE CONTROL ONLY)
(JUMPER FOR DISCHARGE AIR TEMP CONTROL)
AIR PROVING SWITCH (DISCHARGE AIR TEMP CONTROL AND
SUCTION PRESSURE CONTROL) AND REMOTE START/STOP
LOAD LIMIT INPUT
FIGURE 10 -
CONTROL WIRING
CONTROL WIRING
LD13344A
*
* Factory wired with optional transformer.
XTBC2
BLOWER
LD07730C
(MUST BE CLOSED TO OPERATE)
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.
The unit evaporator heater uses 120 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.
Summary of Contents for YLUA0078
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