Control Wiring; Figure 10 - Control Wiring - Johnson Controls Quantech Millennium QCC3080CZE Installation Operation & Maintenance

FORM QCC3-NM1
ISSUE DATE: 12/19/2023

Control wiring

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XTBC1
XTBC2
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.

FIGURE 10 - CONTROL WIRING

Quantech
PWM INPUT (CAN ONLY BE USED WITH DISCHARGE AIR
TEMP CONTROL)
LOAD LIMIT INPUT
AIR PROVING SWITCH (DISCHARGE AIR TEMP CONTROL AND
SUCTION PRESSURE CONTROL) AND REMOTE START/STOP
SYSTEM 1 THERMOSTAT (SUCTION PRESSURE CONTROL ONLY)
(JUMPER FOR DISCHARGE AIR TEMP CONTROL)
SYSTEM 2 THERMOSTAT (SUCTION PRESSURE CONTROL ONLY)
(JUMPER FOR DISCHARGE AIR TEMP CONTROL)
(MUST BE CLOSED TO OPERATE)
BLOWER
SECTION 4: INSTALLATION
*
* Factory wired with optional transformer.
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.
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LD13344A
LD07730C
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