Data Aire Mini dap4 Installation, Operation & Maintenance Manual page 44

2. The chilled water valve responds to a change of the return air temperature after each adjustment period.
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 + 0.0°F =
Current Temperature = Setpoint + Deadband + 0.1°F = 10% Position Open
Current Temperature = Setpoint + Deadband + 0.2°F = 20% Position Open
Current Temperature = Setpoint + Deadband + 0.3°F = 30% Position Open
Current Temperature = Setpoint + Deadband + 0.4°F = 40% Position Open
Current Temperature = Setpoint + Deadband + 0.5°F = 50% Position Open
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
Chilled water valve "closing" sequence (Decreasing Temperature)
1. The chilled water valve proportionally closes 10% for each 0.1°F below the temperature setpoint plus 1.0°F.
2. The chilled water valve responds to a change of the return air temperature after each adjustment period.
3. If the current temperature is lower than the temperature at the last adjustment period, the following sequence will
determine the new valve position:
Current Temperature = Setpoint + 1.0°F = 100% Position Open
Current Temperature = Setpoint + 0.9°F =
Current Temperature = Setpoint + 0.8°F =
Current Temperature = Setpoint + 0.7°F =
Current Temperature = Setpoint + 0.6°F =
Current Temperature = Setpoint + 0.5°F =
Current Temperature = Setpoint + 0.4°F =
Current Temperature = Setpoint + 0.3°F =
Current Temperature = Setpoint + 0.2°F =
Current Temperature = Setpoint + 0.1°F =
Current Temperature = Setpoint + 0.0°F =
4. If the temperature is consistently rising, the valve will open accordingly at each adjustment period. Likewise, if
the temperature is consistently falling, the valve will close accordingly at each adjustment period. However, if the
temperature changes directions, the temperature must change the amount of the deadband before the valve will
be repositioned. The temperature can slowly drift back and forth within a deadband window at any point in the
adjustment period without a valve position change.
ENERGY SAVER and AUXILIARY CHILLED WATER COOLING
1. Energy Saver/Auxiliary Chilled Water Cooling will be available whenever the incoming water (or water/glycol)
supply is below the Energy Saver/Chilled Water temperature setpoint (Menu B).
2. The Energy Saver/Auxiliary Chilled Water Cooling mode will operate only in a two to five degree range above
the setpoint plus the deadband which is programmed in Menu B. The range is between the return air setpoint plus
deadband and Energy Saver changeover band. If the temperature rises above this range, the Energy Saver /
Auxiliary Chilled Water Cooling will be inhibited for the amount of time set in Menu J, "Energy Saver Lockout Time"
and DX (Direct Expansion) cooling will take over. After the amount of time set in Menu J, "Energy Saver Lockout
Time", it will try Energy Saver/Auxiliary Chilled Water Cooling again.
44 • Mini dap4 User Manual
0% Position Open
90% Position Open
80% Position Open
70% Position Open
60% Position Open
50% Position Open
40% Position Open
30% Position Open
20% Position Open
10% Position Open
0% Position Open