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6.6. Compressor and Humiditrol Operation
Table 23. 1-Compressor Humiditrol Default Operation (Using 2-Stage Wired Thermostat or Room Sensor)
Demands Unit Operation
Thermostat or Zone
Sensor
Economizer
Dehumidification
Free Cooling On
CP1 On
Reheat Valve 1 On
Summary
Idle.
X X X CP1 Reheat (Reheat Stage 1)
X X X X CP1 Reheat (Reheat Stage 1)
1st X CP1 Cool
1st X X Free Cool
1st X X CP1 Cool
1st X X X CP1 Cool
2nd X CP1 Cool
2nd X X X Free Cool, CP1 Cool
2nd X X CP1 Cool
2nd X X X CP1 Cool
Free cooling operation is only available on units equipped with an economizer. Default dehumidification demand = RH (A91) > 60% (RH set point
ECTO 4.25). Optional dehumidification demand = P299-8 energized if ECTO 4.25 is set to 100 (digital demand). Heating demand overrides reheat.
Table 24. 2-Compressor Humiditrol Default Operation (Using 2-Stage Wired Thermostat)
Demands Condition Unit Operation
Free Air
Damper
(Economizer)
Reheat
Valve 1
Thermostat
Humidity
Sensor
Trigger OAS
Compressor Blower Speeds
1 2 Vent
Cool
C1
Cool
C2
Heat
G Unoccupied OFF OFF X Closed OFF
G Occupied OFF OFF X Minimum OFF
Y1 Suitable OFF OFF X
Modulate up to
Maximum
OFF
Y2 Suitable OFF OFF X
Modulate up to
Maximum
OFF
Y2
Damper position
and maximum
position and time
expired.
Suitable ON OFF X Maximum Open OFF
Y1 Not Suitable ON OFF X Minimum OFF
Y2 Not Suitable ON ON X Minimum OFF
Dehum ON OFF X Minimum ON
Y1 Dehum ON ON X Minimum ON
Y2 Dehum ON ON X Minimum OFF
W OFF OFF X Minimum OFF