than setpoint, a dehumidification demand exists. The Thermidistat Control responds by activating the dry contact (when enabled in Option 19). It may also control the compressor and blower, depending on equipment type and dehumidify selection choice. The 3 available selections are described below. A mandatory 5 minute blower off delay will be enforced if there has been a call for dehumidification during a cooling call. The amount of extra dehumidification available is very dependent on the type of equipment in the home. Without a
1.Normal Dehumidify Operation
When normal dehumidify is selected, the compressor will not turn on without a cooling demand. If dehumidify demand exists while cooling, dry contact will also be active (24VAC removed). This output commands
2.Cool to Dehumidify
The cool to dehumidify selection tells the system to operate the compres- sor, within limits, when there is a dehumidify demand even if there is no cooling demand. The limits are that the system may overcool up to 3_, but no more, while attempting to satisfy a dehumidify demand. Within this 3_ range, there is an additional balance between overcooling and hu- midity satisfaction. When overcooling must occur, the dehumidify set- point is adjusted upward by 2% per degree of overcooling. For example, a cooling setpoint of 76_F/24_C and a dehumidify setpoint of 60% is equivalent to a cooling setpoint of 75_F/24_C and a dehumidify setpoint of 62%. This dehumidify setpoint change is internal to the Thermidistat Control and is not shown on the display.
49
