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68•dap4UserManual

Current Temperature = Setpoint + Deadband + 0.6°F = 60% Position Open

Current Temperature = Setpoint + Deadband + 0.7°F = 70% Position Open

Current Temperature = Setpoint + Deadband + 0.8°F = 80% Position Open

Current Temperature = Setpoint + Deadband + 0.9°F = 90% Position Open

Current Temperature = Setpoint + Deadband + 1.0°F = 100% Position Open

7. The chilled water valve proportionally closes 10% for each 0.1°F below the temperature set

point plus 1°F.

8. If the current temperature is lower than at the last adjustment period, the following sequence is

used to determine the new valve position:

Current Temperature = Setpoint + 1.0°F = 100% Position Open

Current Temperature = Setpoint + 0.9°F = 90% Position Open

Current Temperature = Setpoint + 0.8°F = 80% Position Open

Current Temperature = Setpoint + 0.7°F = 70% Position Open

Current Temperature = Setpoint + 0.6°F = 60% Position Open

Current Temperature = Setpoint + 0.5°F = 50% Position Open

Current Temperature = Setpoint + 0.4°F = 40% Position Open

Current Temperature = Setpoint + 0.3°F = 30% Position Open

Current Temperature = Setpoint + 0.2°F = 20% Position Open

Current Temperature = Setpoint + 0.1°F = 10% Position Open

Current Temperature = Setpoint + 0.0°F = 0% Position Open

9. The dap4 will switch the unit to DX cooling for one (1) hour after every 100 hours of continuous

 hoursofEnergySaverorAuxiliaryChilledWaterCooling.

ENERGY SAVER and AUXILIARY CHILLED WATER COOLING ASSIST

1.EnergySaver/AuxiliaryChilledWaterCoolingcanoperatesimultaneouslywithcompressor

cooling. An optional discharge temperature sensor is required.

2.TheEnergySaver/AuxiliaryChilledWaterCoolingwillbethesameandthecompressorrules

for short-cycle time will not be violated.

3. The following is the compressor staging sequence at each adjustment period.

UNITS WITH STANDARD (DUAL) SCROLL COMPRESSORS

Cool 1 ON at Temperature Setpoint + Temperature Deadband + 1.3°F and Valve 100% Open

Cool 2 ON at Temperature Setpoint + Temperature Deadband + 1.6°F and Valve 100% Open

Cool 2 OFF at Temperature Setpoint + 1.6°F and Valve 100% Open

Cool1OFFatTemperatureSetpoint+1.3°FandValve100%Openuntilnextadjustmentperiod

UNITS WITH OPTIONAL TANDEM SCROLL or SEMI-HERMETIC (W/UNLOADING) COMPRESSORS

Cool 1 ON at Temperature Setpoint + Temperature Deadband + 1.3°F and Valve 100% Open

Cool 2 ON at Temperature Setpoint + Temperature Deadband + 1.6°F and Valve 100% Open

Cool 3 ON at Temperature Setpoint + Temperature Deadband + 1.9°F and Valve 100% Open

Cool 4 ON at Temperature Setpoint + Temperature Deadband + 2.2°F and Valve 100% Open

Data Aire dap 4 User Manual

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