Relative Humidity - Termination; Dehumidification Purge Cycle; Dehumidification - Thermostat Control - Trane Symbio 700 Controller Application Manual

Dehumidification — Hot Gas Reheat
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Relative Humidity — Termination
Occupied modes of operation, Space Dehumidification control terminates when the Space Humidity is
less than the Space Dehumidification Setpoint minus the Space Dehumidification Setpoint Offset.
Unoccupied mode, Space Unoccupied Dehumidification control terminates when the Space Humidity is
less than the Space Dehumidification Unoccupied Setpoint minus the Space Dehumidification Setpoint
Offset.

Dehumidification Purge Cycle

During dehumidification, a 3–minute compressor cooling purge cycle initiates according to the Reheat
Purge Interval (120 minutes adjustable). The modulating hot gas reheat valve moves to a fixed position
and compressors go to full capacity.
Dehumidification — Thermostat Control
Dehumidification control can be initiated utilizing a Space Humidity input or a Humidistat input. If Space
Humidity input is used for control, dehumidification initiates when Space Humidity exceeds the Space
Dehumidification Setpoint. Dehumidification terminates when Space Humidity is less than Space
Dehumidification Setpoint minus the Space Dehumidification Setpoint Offset.
Utilizing a Humidistat, dehumidification becomes active when the Humidistat input is active.
Dehumidification terminates when the Humidistat is no longer active.
When dehumidification is initiated all compressor outputs energize. The reheat valve will open and
modulate to the Discharge Air Reheat Setpoint (default 70°F). Dehumidification terminates with any Y1
or Y2 call.
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Space Dew Point is less than the Space Dew Point Unoccupied Setpoint – Dew Point Setpoint
Offset or
Outdoor Air Dew Point is less than the Outdoor Air Dew Point Setpoint – Dew Point Setpoint Offset
or
[Space has been unoccupied for less than Unoccupied Dehumidification Timer and Space Relative
Humidity is less than 65% minus Space Dehumidification Setpoint Offset]
ACC-APG002A-EN