45 • Mini dap4 User Manual
Note: The standard Energy Saver/Auxiliary CW valve is an Off/On valve. If unit has optional modulating
valve, the following steps apply (3 – 8).
3. The chilled water valve proportionally opens 10% for each 0.1°F above the temperature setpoint plus temperature
deadband.
4. The chilled water valve responds to a change of the return air temperature after each adjustment period.
5. If the temperature is consistently rising, the valve will be opened more at each adjustment period. Likewise, if the
temperature is consistently falling, the valve will be closed more at each adjustment period. However, if the
temperature movement changes directions, then it must change the amount of the deadband before the valve will
be repositioned. The temperature can be slowly drifting back and forth within a deadband window at any point in
the adjustment period and no valve changes will be made.
6. If the current temperature is higher than at the last adjustment period, the following sequence is used to determine
the new valve position:
Current Temperature = Setpoint + Deadband + 0.0°F = 0% Position Open
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
7. The chilled water valve proportionally closes 10% for each 0.1°F below the temperature setpoint 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
REHEAT
1. Reheat setting is 1 – Elect (electric reheat). The reheat only operates during dehumidication mode.
If one reheat setting is selected, reheat allows during other mode
2. Reheat stages ON and OFF as follows:
Reheat is ON at Temperature Setpoint – Temperature Deadband
Reheat is OFF at Temperature Setpoint
The above reheat staging is for the standard single stage electric reheat. Other types of reheat are available (hot
water and hot gas). They are single stage. Single stage operates in the following manner:
Reheat is ON at Temperature Setpoint – Temperature Deadband
Reheat is OFF at Temperature Setpoint
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