100
HGRH
: Hot Gas Reheat uses a proportional control valve
that is modulated by a
PID algorithm to maintain temperature of the discharge air temperature during
dehumidification
.
The band setting determines the sensitivity of the algorithm. The
smaller the band, the more the algorithm will try to correct the error. If the band
setting is too low, the system will oscillate by being over-responsive. If the band
setting is too high, reheat may lack responsiveness. Ideally, the band s et t ing
s hou ld be as lo w a s possible without causing oscillation. The Integration time
setting is used to slowly shift the HGRH valve opening to correct the error between
temperature reading and set point. The higher Integral time setting, the slower the
valve will be changed. If the Integral time is set too low the valve may change
quickly, causing oscillation. If Integral time setting is too high, the valve may
become sluggish to change. The Derivative time setting causes a sudden change
in HGRH valve opening to correct the error as a result of a quick change in
measured temperature.
Summary of Contents for dap4 touch
Page 1: ...1 dap4 User Manual Data Aire Inc 230 W BlueRidge Avenue Orange CA 92865 www dataaire com...
Page 33: ...32 MENU F INFORMATION differently from what is written in this manual...
Page 69: ...66 MENU K ALARMS LIMITS Service Level continued Control Only...
Page 82: ...78...
Page 133: ...129 Wiring Connections...