66
4. Compressor staging sequence at each adjustment period, sub-menu 3-2 (Mode and Stage Response Time).
UNITS WITH STANDARD (DUAL) SCROLL COMPRESSORS
Compressor “ON” sequence (Increasing Temperature)
Cool 1 ON at Temperature Setpoint + Temperature Deadband
Cool 2 ON at Temperature Setpoint + Temperature Deadband + 0.3º F
Compressor “OFF” sequence (Decreasing Temperature)
Cool 2 OFF at Temperature Setpoint + 0.3º F
Cool 1 OFF at Temperature Setpoint
UNITS WITH OPTIONAL TANDEM SCROLL OR SEMI-HERMETIC COMPRESSORS
Compressor “ON” sequence (Increasing Temperature)
Cool 1 ON at Temperature Setpoint + Temperature Deadband
Cool 2 ON at Temperature Setpoint + Temperature Deadband + 0.3º F
Cool 3 ON at Temperature Setpoint + Temperature Deadband + 0.6º F
Cool 4 ON at Temperature Setpoint + Temperature Deadband + 0.9º F
Compressor “OFF” sequence (Decreasing Temperature)
Cool 4 OFF at Temperature Setpoint + 0.9º F
Cool 3 OFF at Temperature Setpoint + 0.6º F
Cool 2 OFF at Temperature Setpoint + 0.3º F
Cool 1 OFF at Temperature Setpoint
5. If the temperature drops below the setpoint during an adjustment period, all compressors turn OFF at once.
CHILLED WATER COOLING
Chilled water valve “OPENING” sequence (Increasing Temperature)
1. The chilled water valve proportionally opens 10% for each 0.1ºF above the temperature setpoint plus temperature
deadband.
2. The chilled water valve responds to a change of the return air temperature after each adjustment period. When
a change is made to the setpoint, the chilled water valve will delay its response for fi ve (5) minutes, after which it will
respond to each adjustment period.
3. If the current temperature is higher than the temperature at the last adjustment period, the following sequence will
determine the new valve position:
Current Temperature = Setpoint + Deadband + 0.0º F = 0% Position Open
Current Temperature = Setpoint + Deadband + 0.1º F = 10% Position Open
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
To Next Page
Loading...
Need help?
General
