Data Aire dap4 User Manual page 83

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 that you are using.
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 waterside economizer mode (Wtr Vlv configured as Engy Svg
Cool or Aux Chill Wtr in factory menu). The Setpoint is offset by +1.3°F.
When running in the airside economizer mode (feature that requires factory
configuration), the Setpoint is offset by -0.9°F.
Note on Unloaders: When using dual compressors with unloaders the staging
order is:
Stage 1 = C1 + Unloader 1
Stage 2 = C1 + Unloader 1 + C2 + Unloader 2
Stage 3 = C1 + C2 + Unloader 2
Stage 4 = C1 + C2
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