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REHEAT
1. There is a one (1) minute delay between the stop of any reheat stage to start of any reheat stage.
2. There is a one (1) minute delay from start-to-start of different reheat stages. Reheat stages rotate every 100 hours
of runtime.
3. The reheat staging at each adjustment period is as follows:
Reheat 1 ON at Temperature Setpoint – Temperature Deadband
Reheat 2 ON at Temperature Setpoint – Temperature Deadband – 0.3º F
Reheat 3 ON at Temperature Setpoint – Temperature Deadband – 0.6º F
Reheat 3 OFF at Temperature Setpoint – 0.6 ºF
Reheat 2 OFF at Temperature Setpoint – 0.3º F
Reheat 1 OFF at Temperature Setpoint
4. The above staging is for the standard 3 stage electric reheat. Other types of reheat are available (hot water and hot
gas). They are single stage. Single stage operates in the following manner:
Reheat is ON at Temperature Setpoint – Temperature Deadband
Reheat is OFF at Temperature Setpoint
5. Reheat will be overridden by humidifi cation when Sub-Menu 5-6, Group 5 – Confi guration, is programmed for
Computer, Non-Modulating or Computer, Modulating.
HUMIDIFICATION
1. Humidifi cation will inhibit the reheat if sub-menu 5-6, is programmed for HUMIDIFIER: COMPUTER, NON-
MODULATING or HUMIDIFIER: COMPUTER, MODULATING. Reheat is allowed during humidifi cation if sub-menu
5-6, is programmed for HUMIDIFIER COMFORT, NON-MODULATING or HUMIDIFIER COMFORT, MODULATING.
2. There is a one (1) minute delay between stop-to-start of humidifi cation.
3. There is a fi ve (5) minute delay between stop of dehumidifi cation and start of humidifi cation.
4. The humidifi cation staging sequence of each adjustment period for ON/OFF of non-modulating humidifi ers is as
follows:
Humidifi er ON at Humidity Setpoint – Humidity Deadband
Humidifi er OFF at Humidity Setpoint – 1.0%
5. The humidifi cation staging sequence for a modulating humidifi er is as follows:
Valve is OPENED at Humidity Setpoint – 1.0%
Valve is CLOSED at Humidity setpoint – 0.5%
6. When the humidifi er valve is opened, its position will follow a linear ramp that goes from 25% open with the humidity
at setpoint minus 0.5% to 100% open at setpoint minus humidity deadband.
DEHUMIDIFICATION
1. Dehumidifi cation Mode, sub-menu 3-9, is used to select one (1) or two (2) compressors for dehumidifi cation and with
or without reheat limits.
2. If dehumidifi cation is programmed for “WITHIN REHEAT LIMITS” dehumidifi cation will inhibit reheat if the return air
temperature drops to temperature setpoint minus temperature deadband minus 0.9º F. Dehumidifi cation will be inhibited
until the return air temperature rises to the temperature setpoint. Compressor short-cycle time will not be violated.
Summary of Contents for DAP III
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