6. Reheat Operation
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Table 22. 4−Compressor Humiditrol Default Operation (using 2−stage Thermostat)
Demands Unit Operation
T’Stat
Economizer
Dehumidification
Free Cooling On
CP1 On
CP2 On
CP3 On
CP4 On
Reheat Valve 1 On
Reheat Valve 2 On
Summary
Idle.
X X X X X CP1 Reheat, CP2 Reheat (Reheat Stage 1)
X X X X X X CP1 Reheat, CP2 Reheat (Reheat Stage 1)
1st X X CP1 Cool, CP2 Cool
1st X X Free Cool
1st X X X X X X X CP1 Reheat, CP2 Reheat, CP3 Cool, CP4 Cool (Reheat Stage 2)
1st X X X X X X X X CP1 Reheat, CP2 Reheat, CP3 Cool, CP4 Cool (Reheat Stage 2)
2nd X X X X CP1 Cool, CP2 Cool, CP3 Cool, CP4 Cool
2nd X X X X Free Cool, CP1 Cool, CP2 Cool
2nd X X X X X CP1 Cool, CP2 Cool, CP3 Cool, CP4 Cool
2nd X X X X X X CP1 Cool, CP2 Cool, CP3 Cool, CP4 Cool
Free cooling operation is only available on units equipped with an economizer. Default dehumidification demand = RH (A91) > 60% (RH setpoint ECTO
4.25). Optional dehumidification demand = P299−8 energized if ECTO 4.25 is set to 100 (digital demand). Heating demand overrides reheat.
Table 23. 4−Compressor Humiditrol Default Operation (using 4−stage Thermostat DDC with Zone
Sensor)
Demands Unit Operation
T’Stat, DDC, or
Zone Sensor
Economizer
Dehumidification
Free Cooling On
CP1 On
CP2 On
CP3 On
CP4 On
Reheat Valve 1 On
Reheat Valve 2 On
Summary
Idle.
X X X X X CP1 Reheat, CP2 Reheat (Reheat Stage 1)
X X X X X X CP1 Reheat, CP2 Reheat (Reheat Stage 1)
1st X CP1 Cool
1st X X Free Cool
1st X X X X X X CP1 Reheat, CP2 Reheat, CP3 Cool (Reheat Stage 2)
1st X X X X X X X CP1 Reheat, CP2 Reheat, CP3 Cool (Reheat Stage 2)
2nd X X CP1 Cool, CP2 Cool
2nd X X X Free Cool, CP1 Cool
2nd X X X X X X X CP1 Reheat, CP2 Reheat, CP3 Cool, CP4 Cool (Reheat Stage 3)
2nd X X X X X X X X CP1 Reheat, CP2 Reheat, CP3 Cool, CP4 Cool (Reheat Stage 3)
3rd X X X CP1 Cool, CP2 Cool, CP3 Cool
3rd X X X X Free Cool, CP1 Cool, CP2 Cool
3rd X X X X CP1 Cool, CP2 Cool, CP3 Cool
3rd X X X X X CP1 Cool, CP2 Cool, CP3 Cool
4th X X X X CP1 Cool, CP2 Cool, CP3 Cool, CP4 Cool
4th X X X X X X Free Cool, CP1 Cool, CP2 Cool, CP3 Cool, CP4 Cool
4th X X X X X CP1 Cool, CP2 Cool, CP3 Cool, CP4 Cool
4th X X X X X X CP1 Cool, CP2 Cool, CP3 Cool, CP4 Cool
Free cooling operation is only available on units equipped with an economizer. Default dehumidification demand = RH (A91) > 60% (RH setpoint
ECTO 4.25). Optional dehumidification demand = P299−8 energized if ECTO 4.25 is set to 100 (digital demand).