70 • dap4 User Manual
SCR REHEAT SETTING
1. If unit is built with an optional SCR reheat, Menu F- Factory Settings - Reheat setting - Enable
Reheat SCR Y4 is set to YES, dap4 will send a 0-10VDC modulating signal to control a SCR
reheat controller.
2. SCR Reheat Proportional Band range is 1- 20°F with 1°F default value.
3. SCR reheat can be overridden by humidification.
4. When space temperature is lower than temperature setpoint, dap4 will send a 0-10 VDC signal
to SCR reheat as follow:
When temperature drops, Y4 output signal is:
0VDC when R/A temp = Temp SP- Temp DB
1VDC when R/A temp = Temp SP- Temp DB - 0.1 SCR Pro. band
2VDC when R/A temp = Temp SP- Temp DB - 0.2*SCR Pro. band
3VDC when R/A temp = Temp SP- Temp DB - 0.3*SCR Pro. band
4VDC when R/A temp = Temp SP- Temp DB - 0.4*SCR Pro. band
5VDC when R/A temp = Temp SP- Temp DB - 0.5*SCR Pro. band
6VDC when R/A temp = Temp SP- Temp DB - 0.6*SCR Pro. band
7VDC when R/A temp = Temp SP- Temp DB - 0.7* SCR Pro. band
8VDC when R/A temp = Temp SP- Temp DB - 0.8*SCR Pro. band
9VDC when R/A temp = Temp SP- Temp DB - 0.9*SCR Pro. band
10VDC when R/A temp = Temp SP- Temp DB - SCR Pro. band
When temperature rises, Y4 output signal:
0VDC when R/A temp = Temp SP
1VDC when R/A temp = Temp SP - 0.1 SCR Pro. band
2VDC when R/A temp = Temp SP - 0.2*SCR Pro. band
3VDC when R/A temp = Temp SP - 0.3*SCR Pro. band
4VDC when R/A temp = Temp SP - 0.4*SCR Pro. band
5VDC when R/A temp = Temp SP - 0.5*SCR Pro. band
6VDC when R/A temp = Temp SP - 0.6*SCR Pro. band
7VDC when R/A temp = Temp SP - 0.7* SCR Pro. band
8VDC when R/A temp = Temp SP - 0.8*SCR Pro. band
9VDC when R/A temp = Temp SP - 0.9*SCR Pro. band
10VDC when R/A temp = Temp SP - SCR Pro. band
HUMIDIFICATION
1. Humidification will inhibit the reheat if programmed (See Menu J Factory Settings) for Humidi-
fier: Computer Non-Modulating or Humidifier: Computer Modulating. Reheat is allowed during
humidification if programmed for Humidifier Comfort, Non-Modulating or Humidifier Comfort,
Modulating.
2. There is a one (1) minute delay between the stop-to-start of humidification.
3. There is a five (5) minute delay between the dehumidification and start of humidification.
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