On/Off Compressors Controlling Dewpoint: In Dewpoint control mode,
compressors are staged according to dewpoint, but the relative humidity level
control shown above is also able to stage compressors on.
Single Compressor as dewpoint is increasing:
ON at High DP Setpoint
Single Compressor as dewpoint is decreasing:
OFF at High DP Setpoint minus DP DB
Two Compressor staging as dewpoint is increasing:
Stage 1 ON at High DP Setpoint minus 0.2°F
Stage 2 ON at High DP Setpoint
Two Compressor staging as dewpoint is decreasing:
Stage 2 OFF at High DP Setpoint minus DP DB
Stage 1 OFF at High DP Setpoint minus DP DB minus 0.2°F
Four Compressor staging as dewpoint is increasing:
Stage 1 ON at High DP Setpoint minus 0.6°F
Stage 2 ON at High DP Setpoint minus 0.4°F
Stage 3 ON at High DP Setpoint minus 0.2°F
Stage 4 ON at High DP Setpoint
Four Compressor staging as dewpoint is decreasing:
Stage 4 OFF at High DP Setpoint minus DP DB
Stage 3 OFF at High DP Setpoint minus DP DB minus 0.2°F
Stage 2 OFF at High DP Setpoint minus DP DB minus 0.4°F
Stage 1 OFF at High DP Setpoint minus DP DB minus 0.6°F
Note: If Humidity Anticipation is enabled, the setpoint in the above examples could
be offset as much as 10% depending on how far temperature is from the
temperature setpoint.
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