68 WGS 130A to 190A OM WGS-5
The Stage Down Error Step is added to Stage Down Accumulator once every Stage Down
Error Delay seconds. When the Stage Down Error Accumulator is greater than the Stage
Down Error Setpoint, another stage of condenser fans turned off.
When a stage down occurs or the saturated temperature rises back within the Stage Down
deadband, the Stage Down Error Accumulator is reset to zero. The accumulator is also held
at zero after startup until either the outside ambient temperature is less than or equal to 75F,
or the saturated condenser temperature is greater than the condenser target less the active
stage down deadband.
Condenser Fan VFD
Fan VFD operation is available for use with remote condenser units.
For units configured with remote condensers, there is an option to enable fan VFD
operation.
Fan VFD speed and target are displayed.
Fan VFD minimum speed and maximum speed set points are available.
An input for fan VFD fault was added at digital input 4 on each circuit controller. VFD
faults are logged in the event log, and notification sent on BAS interface.
Fan VFD speed is sent on BAS interface.
Digital Output Control
Each digital output is controlled according to the following rules. All outputs are initialized
to OFF at power on.
Alarm – (Terminals J12 – NO1)
This output is turned ON when any Equipment Protection ALARM occurs. It is turned OFF
when all alarms have been cleared.
Evaporator Pump – (Terminals J12 – NO2)
An Evaporator Water Pump output is ON if the Evap State is set to START or RUN.
Fan #1 to #8 (Air-Cooled Condensers)
[Water Cooled = N] - Condenser Fans Staging is based on condenser pressure as selected by
Fan Stage On & Off setpoints. Fans 1, 3, 5 and 7 are for circuit 1, and fans 2, 4, 6, and 8 are
for circuit 2. Fans 1 and 2 start with the first compressor on the respective circuit when the
ambient temperature is greater than 75F. Below 75F, these fans start when the condenser
pressure gets up to the stage on setpoint.
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