Catalogue

WSHP-PRC020D-EN 51
Controls
Deluxe 24V Electronic Controls
Deluxe 24V features include:
Anti-short CycleTimer
The anti-short cycle timer provides a three minute time delay between compressor stop and
compressor restart. Once thermostat is enabled, an automatic 3 minute delay is provided for
compressor protection.
Brown-out Protection
The brown-out protection function measures the input voltage to the controller and halts the
compressor operation. Once a brown-out situation has occurred, the anti-short cycle timer will
become energized.The general fault contact will not be affected by this condition.The voltage will
continue to be monitored until the voltage increases.The compressors will be enabled at this time
if all start-up time delays have expired, and all safeties have been satisfied.
Compressor Disable
The compressor disable relay provides a temporary disable in compressor operation.The signal
would be provided from a water loop controller in the system. It would disable the compressor
because of low water flow, peak limiting or if the unit goes into an unoccupied state. Once the
compressor has been disabled, the anti-short cycle time period will begin. Once the compressor
disable signal is no longer present, and all safeties are satisfied, the control will allow the
compressor to restart.
Diagnostics
Three LEDs (light emitting diodes) are provided for indicating the operating mode of the controller.
See the unit IOM for diagnostics or troubleshooting through the use of the LEDs.
Random Start
The random start relay provides a time delay start-up of the compressor when cycling in the
occupied mode. A new start delay time between 3 and 10 seconds is applied each time power is
enabled to the unit.
Safety Control
The deluxe microprocessor receives separate input signals from the refrigerant high pressure
switch, low suction pressure switch and condensate overflow.
The 24V deluxe design is a microprocessor-based control board conveniently
located in the control box.The board is unique toTrane water-source products
and is designed to control the unit as well as provide outputs for unit status
and fault detection.
The board is factory wired to a terminal strip to provide all necessary terminals
for field connections.
The deluxe 24V electronic unit control contains upgraded features to
maximize system performance to extend the system life. Each device, is
factory mounted, wired, and tested in the unit. Other features include
compressor contactor, compressor lockout function, anti-short cycle
compressor protection, random start delay, brown-out protection, low
pressure time delay, low pressure switch, condensate overflow, freeze
protection, high pressure switch, compressor delay on start, reversing valve
coil (for heating and cooling units), multi-speed fan motor, soft lockout mode.
Note: Electric heat is optional.