Data Aire dap4 User Manual page 88

Operation of Reheat – Continued
Staging Heating Elements:
When temperature is dropping:
Stage 1 ON at Setpoint minus Deadband
Stage 2 ON at Setpoint minus Deadband minus Stage-to-Stage
Stage 3 ON at Setpoint minus Deadband minus 2 X Stage-to-Stage
Note: there is a minimum delay of 60 seconds before next stage turns on.
When temperature is rising:
Stage 3 OFF at Setpoint minus 2 X Stage-to-Stage
Stage 2 OFF at Setpoint minus Stage-to-Stage
Stage 1 OFF at Setpoint
SCR Reheat: This feature uses an optional SCR reheat module. (Note: SCR
reheat mode is enabled automatically when the cooling mode is set to "precise"
setting. Rather than heat stages, the SCR module modulates the heaters for better
regulation. The SCR Band setting determines how far below set point minus dead
band the temperature can drop for modulation to reach 100%.
HGRH: This feature uses a Hot Gas proportional control valve. The HGRH Band
setting determines how far below set point minus dead band the temperature can
drop for modulation to reach 100%.
HGRH+1: Operates like the HGRH mode above but will stage a second reheat
element when temperature drops below the setpoint minus the stage-to-stage
setting.
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