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VARC Chiller Controls General Information
WARNING: ELECTRICAL SHOCK HAZARD.
Verify that all units’ power lines are in unison
phasing, in order to eliminate the potential for a
short circuit. Failure to obey this warning could
result in death or serious injury.
5.3 Touch Screen Connection
Make the following connections to the touch screen:
a. A 24 VDC supply to power the display
b. A three-core communication cable connected to
serial port 1, not port 2
Terminate the three-core communication cable on
Terminal Bus 3 (Modbus Com) on VARC 1.
q
w e
r
7 Touch Screen Connections
q
Power Input (24 V)
e
Connection Port for
Remote Connectivity
w
USB Port
r
Communication
Connection from PICO
(3 Conductor, 18 G
wire)
5.4 Firmware Verification
Chillers should come from the factory with the correct
firmware preloaded. However, it is worth checking
that the firmware versions of all chiller stages match, as
incompatible firmware can seem to work during initial
setup but then cause networking problems later.
To view the firmware version of a stage:
1. Press the Program button. See “LCD Buttons” on
page 5.
2. Scroll up or down to Technician, and then press Enter.
If prompted for a password, enter 3156.
3. Select Information.
The Information screen is displayed.
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