Data Aire dap 4 - Chilled Water Valve Closing; Humidifier Operation

74•dap4UserManual
   Open20%ifreturn_relative_humidity=humidity_setpoint–0.8%
   Open30%ifreturn_relative_humidity=humidity_setpoint–0.7%
   Open40%ifreturn_relative_humidity=humidity_setpoint–0.6%
   Open50%ifreturn_relative_humidity=humidity_setpoint–0.5%
   Open60%ifreturn_relative_humidity=humidity_setpoint–0.4%
   Open70%ifreturn_relative_humidity=humidity_setpoint–0.3%
   Open80%ifreturn_relative_humidity=humidity_setpoint–0.2%
   Open90%ifreturn_relative_humidity=humidity_setpoint–0.1%
   Open100%ifreturn_relative_humidity=humidity_setpoint
Chilled Water valve closing
Whilestillindehumidicationmode,ChilledWatervalvewillstarttocloseifdewpointisde-
creasing OR relative humidity is decreasing closer to the setpoints minus deadband. The
modulation of the CW valve will be based on whichever has HIGHER demand for CW valve to
open.Forexample,ifdewpointrequirestheCWvalvetoopen20%andhumidityrequiresthe
CW valve to open 50%, as a result, CW valve will open 50%. Individual logic for CW valve
closing based on dewpoint and humidity is as followed:
CW valve modulation based on dewpoint
 Starttocloseifreturndewpointdropstohigh_dewpoint_setpoint–high_dewpoint_deadband;
after that, the CW valve will:
 Open90%ifreturndewpoint=high_dewpoint_setpoint–high_dewpoint_deadband–0.1°F
 Open80%ifreturndewpoint=high_dewpoint_setpoint–high_dewpoint_deadband–0.2°F
 Open70%ifreturndewpoint=high_dewpoint_setpoint–high_dewpoint_deadband–0.3°F
 Open60%ifreturndewpoint=high_dewpoint_setpoint–high_dewpoint_deadband–0.4°F
 Open50%ifreturndewpoint=high_dewpoint_setpoint–high_dewpoint_deadband–0.5°F
 Open40%ifreturndewpoint=high_dewpoint_setpoint–high_dewpoint_deadband–0.6°F
 Open30%ifreturndewpoint=high_dewpoint_setpoint–high_dewpoint_deadband–0.7°F
 Open20%ifreturndewpoint=high_dewpoint_setpoint–high_dewpoint_deadband–0.8°F
 Open10%ifreturndewpoint=high_dewpoint_setpoint–high_dewpoint_deadband–0.9°F
 Closedifreturndewpoint=high_dewpoint_setpoint–high_dewpoint_deadband-1.0°F
CW valve modulation based on humidity
 Startstocloseifreturn_relative_humiditydropstohumidity_setpoint–humidity_deadband;
after that, the CW valve will:
 Open90%ifreturn_relative_humidity=humidity_setpoint–humidity_deadband–0.1%
 Open80%ifreturn_relative_humidity=humidity_setpoint–humidity_deadband–0.2%
 Open70%ifreturn_relative_humidity=humidity_setpoint–humidity_deadband–0.3%
 Open60%ifreturn_relative_humidity=humidity_setpoint–humidity_deadband–0.4%
 Open50%ifreturn_relative_humidity=humidity_setpoint–humidity_deadband–0.5%
 Open40%ifreturn_relative_humidity=humidity_setpoint–humidity_deadband–0.6%
 Open30%ifreturn_relative_humidity=humidity_setpoint–humidity_deadband–0.7%
 Open20%ifreturn_relative_humidity=humidity_setpoint–humidity_deadband–0.8%
 Open10%ifreturn_relative_humidity=humidity_setpoint–humidity_deadband–0.9%
 Closedifreturn_relative_humidity=humidity_setpoint–humidity_deadband–1.0%
Humidier Operation
HumidierwillturnonwhendewpointisbelowLowDewpointSetpoint
HumidierwillturnoffwhendewpointisaboveLowDewpointSetpoint+LowDewpointDeadband