10-2014 gForce User Manual ● 109
Discharge air temperature is dropping (Off cycle):
Fixed speed compressor C2 turns off when discharge air temperature drops to
the temperature setpoint – C2 offset.
Variable speed compressor C1 turns off when discharge air temperature drops to
temperature setpoint – C1 offset.
9.2.2.3 Energy saver/ auxiliary cooling without DX cooling assist in discharge
temperature control.
The energy saver logic is similar to current energy saver logic without DX cooling assist.
Energy Saver/Auxiliary Chilled Water Cooling will be available whenever the
incoming water supply is below the setpoint of the Energy saver Water
Thermostat in menu B-setpoint – Energy Saver.
If system switches to DX cooling and chilled water temperature drops below the
energy saver setpoint, the system will switch back to chilled water cooling after
an energy saver lock-out time delay.
The Energy Saver/Auxiliary Chilled Water mode will operate when discharge
temperature is between the discharge air setpoint plus Energy saver to DX
change-over band. If the temperature rises above this range, Energy
Saver/Auxiliary Chilled Water Cooling will be inhibited for at least 15 minutes to
an hour it depends on Energy saver Lockout delay setting in Factory settings
menu, and only DX cooling will be available during this period. After a lockout
time delay, system will try Energy Saver/Auxiliary Chilled Water Cooling again.
Reheat should not be used in this mode.
When unit switches to DX mode it will use the DX cooling logic in item a and b
above to maintain the discharge temperature setpoint. All DX safeties are
applied.
dap4™ uses a preset PID loop to control CW valve to maintain discharge air
temperature setpoint if energy saver chilled water is available and discharge air
temperature is below setpoint plus Energy saver to DX change-over band.
9.2.2.4 Energy saver/ auxiliary cooling with DX cooling assist in discharge temperature
control.
Energy Saver/Auxiliary Chilled Water Cooling can operate simultaneously with
compressor cooling if Energy saver assist mode is set to 1 Comp or 2 Comp
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