Please Note: Compressor operation is based on the type of compressor(s) that are
configured and the temperature being controlled. Please refer to the proper section
for the type of compressors and control mode of your equipment.
Standard On/Off compressors:
When temperature is increasing:
Stage 1 ON at Setpoint + Deadband
Stage 2 ON at Setpoint + Deadband + Stage-to-Stage
Stage 3 ON at Setpoint + Deadband + Stage-to-Stage X 2
Stage 4 ON at Setpoint + Deadband + Stage-to-Stage X 3
When temperature is decreasing:
Stage 4 OFF at Temperature Setpoint + Stage-to-Stage X 3
Stage 3 OFF at Temperature Setpoint + Stage-to-Stage X 2
Stage 2 OFF at Temperature Setpoint + Stage-to-Stage
Stage 1 OFF at Temperature Setpoint
Note: The “Stage to Stage” setting is in the Setpoints menu (its default value is
0.3°). There is a minimum delay between stages that is set as the “Delay Btw
Stages” in the factory menu (its default value is 60 seconds).
When running in the airside economizer or waterside energy saver mode (Wtr Vlv
configured as Engy Svg Cool or Aux Chill Wtr in factory menu). The Setpoint is
offset by 1.3°F.
Standard On/Off Compressors with Unloaders: The unloader logic table is:
Stage 1 = C1 + Unloader
Stage 2 = C1 + Unloader & C2 + Unloader
Stage 3 = C1 & C2 + Unloader
Stage 4 = C1 & C2
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