Zone Controller Configuration:

• Humidity Settings: On
• Control Mode: Cool + Heat
• Target Supply: (set to temp to target by staging or modulating heat)
• Cool Stages: (set to number of cool stages to enable during dehumidification)
• Dehumidification Static Pressure: (set to a lower static to reduce fan speed)

NOTE: Zone thermostat must have relative humidity sensors and be configured to “Dehumidify”.

Zone Controller Sequence:

1.  When one more thermostats require dehumidification, they will request a Dehumidification Cycle from the Zone Controller.
2.  If the Zone Controller does not have an active Heat or Cool cycle it will initiate a Dehumidification Cycle.
3.  This will report an active Ventilation Cycle to thermostats not specifically requesting dehumidification.
4.  This will report an active Dehumidification Cycle to thermostats requesting dehumidification.
5.  The Zone Controller’s Dehumidification Cycle is a Cool and Heat Cycle.
6.  The Cool portion of the cycle is to energize the number of configured stages with no regard to supply temperature.
7. The Heat portion of the cycle adjusts to maintain the Target Supply configuration set in the Humidity Settings above by following standard heat staging and/or modulation sequences to maintain the target supply temperature.

Note: Variable Temperature Control will only operate if the heat stages are set to a non-zero value. This is because Variable Temperature Control will only activate if central heating is active. If there are no heat stages configured then the controller does not think it has central heating.

This specific configuration is useful for two cases:
1. We are using central heat to both heat the building and temper the air for dehumidification sequences.
2. We have a hot gas bypass and no central heat and we need that to be enabled and/or modulated for a dehumidification sequence.