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859731-D
OTHER POTENTIAL PROBLEMS
Problem
Suggested Remedy
Cannot find cooler(s) on
RS 485 Modbus network
Ensure cooler is powered up. Ensure cooler control is set to WC (Wall
Controller). Ensure cooler has a unique node address set.
Refer to installation literature provided with the cooler for setup instructions"
Check SETTTINGS – CONFIGURATION - NETWORK to review installed
coolers.
Press MODIFIY to re-scan all nodes.
If “DEVICE NOT DETECTED” is displayed, check RS 485 cabling between
wall control and cooler. Check 120Ω Modbus terminating resistor is fitted
to the Wall Controller and the last Cooler in the network. When the Modbus
network is connected correctly a measurement of 60Ω should present at any
point in the network.
Cooler(s) not running
The Wall Controller is not in COOL mode with either INDIRECT or DIRECT
cooling stages selected.
The set temperature has been achieved and the coolers are in standby.
The Controller is in PROGRAM mode and the current time period specifies
the cooler is “OFF”.
Review the schedule via the SETTINGS - PROGRAM screen.
Check SETTINGS – DEVICE – FAULT HISTORY. Check and rectify Faults
Temperature and/or
Relatively Humidity
values are not steady/
constantly changing
Avoid blocking or restricting the vent holes located on the underside of the
Controller, as this is where the sensors are located.
Check for damage to circuit board on back of controller.
Water, debris, insects can access through unsealed wall cable entry holes.
Replace Wall Controller.
Touchscreen
unresponsive
Clean screen.
Do not use harsh chemical cleaners, for best results use distilled water or a
touchscreen specific cleaning agent with a microfibre cloth.
Remove and reapply power to Wall Controller to force a reboot
Replace Wall Controller
Forgotten User
Password
(Entered user passcode
incorrectly 5 times).
When requested, enter RESET passcode 5331
COOLER FAULTS AND TROUBLESHOOTING
Summary of Contents for CW-H 2020 PLC
Page 1: ...OWNER S MANUAL CW H 2020 PLC WALL CONTROLLER English Original English Instructions ILL2468 A ...
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