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Controls Interface
Microprocessor Control System
The Thermafit MWC and WXM chiller/heat pump models
employ a Carel c.pCO all-digital data control system to
control and report key system settings and indicators.
Primary Microprocessor Controller
Both the primary and secondary modules use a Carel c.
pCO medium microprocessor controller. The primary
microprocessor controller rotates the lead compressors
every 168 system operating hours. See figure below.
Figure 24. c.pCO primary controller
Secondary Microprocessor Controller
In a normal configuration, a secondary controller controls
the single module to which it is dedicated. The distributed
primary microprocessor controller system enables the
chiller/heat pump in the event the primary microprocessor
controller fails. The system automatically fails over to
distributed primary control where each secondary controller
operates its own module but lacks the ability to rotate the
lead compressors every 168 system operating hours.
Touchscreen Interface Panel
The touchscreen interface panel is the primary means for
controlling and monitoring the system for the operator and
maintainer. See figure below.
52
Figure 25. Touch interface panel
Operator Control and Monitoring
Each system is provided with a touchscreen interface panel
that is used to turn the chiller/heat pump on and off, adjust
set points, clear alarms, and perform detailed set-up of the
microprocessor controllers.
Chiller/Heat Pump Control
The operator uses three different types of controls and
indicators to monitor and maintain the desired operating
parameters in the MWC and WXM chiller/heat pump -
Power Distribution, Electrical Controls, and Refrigeration
Controls. These controls and indicators are located in the
power panels and the microprocessor controllers.
Power Distribution
There are two different electrical panels used in the
Thermafit MWC and WXM chiller/heat pump. The main
power distribution panel receives power from the building
source and distributes it to the individual chiller/heat pump
modules. The module electrical and control panel receives
power from the power distribution panel and provides
power to individual electrical components.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
ARTC-SVX010A-EN
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