70
3. If dehumidifi cation is programmed for “NO REHEAT LIMITS” it remain ON until the humidity setpoint is reached. In
this mode dehumidifi cation has priority and overcooling is disregarded. The reheat sequence will remain the same.
4. If dehumidifi cation is programmed for two (2) compressors, with or without reheat limits, only one (1) compressor
will be allowed if reheat is required.
5. There is a one (1) minute delay between stop-to-start of dehumidifi cation. Compressor short-cycle time delay will
not be violated.
6. There is a fi ve (5) minute delay between dehumidifi cation and humidifi cation.
7. The compressor staging sequence for dehumidifi cation at each adjustment period is as follows:
UNITS WITH STANDARD (DUAL) SCROLL COMPRESSORS
Cool 1 ON at Humidity Setpoint + Humidity Deadband
Cool 2 ON at Humidity Setpoint + humidity Deadband + 1%
Cool 2 OFF at Humidity Setpoint + 1%
Cool 1 OFF at Humidity Setpoint
UNITS WITH OPTIONAL TANDEM SCROLL OR SEMI-HERMETIC (with unloading) COMPRESSORS
Cool 1 ON at Humidity Setpoint + Humidity Deadband
Cool 2 ON at Humidity Setpoint + humidity Deadband + 1%
Cool 3 ON at Humidity Setpoint + humidity Deadband + 2%
Cool 4 ON at Humidity Setpoint + humidity Deadband + 3%
Cool 4 OFF at Humidity Setpoint + 3%
Cool 3 OFF at Humidity Setpoint + 2%
Cool 2 OFF at Humidity Setpoint + 1%
Cool 1 OFF at Humidity Setpoint
8. The sequence for dehumidifi cation with Energy Saver or Auxiliary Chilled Water Cooling is as follows:
Valve is OPENED to 100% at Humidity Setpoint + Humidity Deadband
Valve is CLOSED at Humidity Setpoint
DEHUMIDIFICATION FOR CHILLED WATER UNITS
1. All of the standard dehumidifi cation rules for dehumidifi cation with compressors applies to chilled water units.
2. The chilled water valve responds to a change of the return air relative humidity 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 after each adjustment period.
3. The dehumidifi cation sequence for chilled water units as is follows:
Valve is OPENED to 100% at Humidity Setpoint + Humidity Deadband
Valve is CLOSED at Humidity Setpoint
AUTOMATIC FLUSH CYCLE LOGIC for CHILLED WATER or HOT WATER COILS
If 100 hours elapses and the chilled water or hot water valve has not opened for normal cooling or heating, the valve
will automatically open for 30 seconds to fl ush the coil. The microprocessor will not display a message indicating the
fl ush cycle is in progress.
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