68
Current Temperature = Setpoint + Deadband + 0.2º F = 20% Position Open
Current Temperature = Setpoint + Deadband + 0.3º F = 30% Position Open
Current Temperature = Setpoint + Deadband + 0.4º F = 50% Position Open
Current Temperature = Setpoint + Deadband + 0.6º F = 60% Position Open
Current Temperature = Setpoint + Deadband + 0.7º F = 70% Position Open
Current Temperature = Setpoint + Deadband + 0.8º F = 80% Position Open
Current Temperature = Setpoint + Deadband + 0.9º F = 90% Position Open
Current Temperature = Setpoint + Deadband + 1.0º F = 100% Position Open
7. The chilled water valves proportionally closes 10% for each 0.1ºF below the temperature setpoint plus 1ºF.
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 + 1.0º F = 100% Position Open
Current Temperature = Setpoint + 0.9º F = 90% Position Open
Current Temperature = Setpoint + 0.8º F = 80% Position Open
Current Temperature = Setpoint + 0.7º F = 70% Position Open
Current Temperature = Setpoint + 0.5º F = 50% Position Open
Current Temperature = Setpoint + 0.4º F = 40% Position Open
Current Temperature = Setpoint + 0.3º F = 30% Position Open
Current Temperature = Setpoint + 0.2º F = 20% Position Open
Current Temperature = Setpoint + 0.1º F = 10% Position Open
Current Temperature = Setpoint + 0.0º F = 0% Position Open
9. DAP III will switch the unit to DX cooling for 1 hour after every 100 continuous hours of Energy Saver or Auxiliary
Chilled Water cooling.
ENERGY SAVER and AUXILIARY CHILLED WATER COOLING with COMPRESSOR SUPPLEMENT
1. Energy Saver/Auxiliary Chilled Water Cooling can operate simultaneously with compressor cooling. An optional
discharge sensor is required.
2. The Energy Saver/Auxiliary Chilled Water Cooling will be the same and 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 + 1.3º F and Valve 100% Open
Cool 2 ON at Temperature Setpoint + Temperature Deadband + 1.6º F and Valve 100% Open
Cool 2 OFF at Temperature Setpoint + 1.6ºF and Valve 100% Open
Cool 1 OFF at Temperature Setpoint + 1.3ºF 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 + 1.3º F and Valve 100% Open
Cool 2 ON at Temperature Setpoint + Temperature Deadband + 1.6º F and Valve 100% Open
Cool 3 ON at Temperature Setpoint + Temperature Deadband + 1.9º F and Valve 100% Open
Cool 4 ON at Temperature Setpoint + Temperature Deadband + 2.2º F and Valve 100% Open
Cool 4 OFF at Temperature Setpoint + 2.2ºF and Valve 100% Open
Cool 3 OFF at Temperature Setpoint + 1.9ºF and Valve 100% Open
Cool 2 OFF at Temperature Setpoint + 1.6ºF and Valve 100% Open
Cool 1 OFF at Temperature Setpoint + 1.3ºF and Valve 100% Open until next adjustment period
To Next Page
Loading...
Need help?
General
