Data Aire gForce Ultra User Manual page 104

compressor C1 has operated at above 95% of its maximum speed for the "C2 on
delay" period.
menu (default=60s). For instance: SP = 72⁰F, DB = 2⁰F, STS = 0.3⁰F.
Compressor will be on at 74.3⁰F.
Return air temperature is dropping (Off cycle):
 Fixed speed compressor C2 turns off when return air temperature drops below
Temperature Setpoint – STS Band (default STS band=0.3⁰F) for duration of C2
off delay (default =5s). For instance: SP = 72⁰F, STS = 0.3⁰F. Compressor goes
off at 71.7⁰F after 5 seconds delay.
 After Fixed speed compressor C2 turns off, variable speed compressor C1 ramps
up to its maximum speed and operates at maximum speed for a "Delay
Modulation" period (default=60s). The Delay modulation is set in the
Compressor/Factory settings menu.
 Variable speed compressor C1 will then modulate to maintain setpoint and turns
off when return air temperature drops to temperature setpoint – C1offset
(default=2⁰F); and C1 has operated for at least minimum runtime period. For
instance: SP= 72⁰F, C1 offset = 2⁰F, compressor goes off at 70⁰F if it has ran for
6 minutes (minimum runtime is fset to 6 minutes).
9.2.1.3 Energy saver/ auxiliary cooling without DX cooling assist.
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
 The Energy Saver/Auxiliary Chilled Water mode will operate when space
temperature is between the return air setpoint plus deadband and plus Energy
saver to DX change-over band.
Energy Saver/Auxiliary Chilled Water Cooling will be inhibited for at least 15
minute to an hour (see Energy saver Lockout setting in Factory settings menu for
details) and only DX cooling will be available. After a lockout time delay, system
will try Energy Saver/Auxiliary Chilled Water Cooling again.
 The chilled water valve proportionally opens 10% for each 0.1ºF above the
Temperature Setpoint + Temperature Deadband.
 If the temperature is consistently rising, then the valve will be opened wider.
Likewise, if the temperature is consistently falling, then the valve will be close
gradually. However, if temperature movement changes directions, then it must
104 ● gForce Ultra User Manual
C2 on period is programmed in Compressor/Factory settings
If the temperature rises above this range,
10-2014