Data Aire dap 4 User Manual

96•dap4UserManual
1. Speed Constant (Const. Speed)
2. Speed Controlled by BMS (BMS Speed)
3. Speed Proportional to CW Valve (Vlv. Pos. Speed)
4. Static Pressure Constant (Air Pressure)
5. AirowConstant(Const.ow)
6. AirowControlledbyBMS(BMSFlow)
7. AirowProportionaltoCWValve(Vlv.Pos.Flow)
8. Fan speed controlled by Return air temperature setpoint (Mod to R. Air)
9. Mod to Rack
1. Speed Constant (Const. Speed) - Default
In Speed Constant mode, the dap4 will start and operate the fan at the constant speed set in
CW SPEED. The constant speed is controlled by outputting a constant voltage to the fan
speed controller.
2. Speed Controlled by BMS (BMS Speed)
In Speed Controlled by BMS mode, the dap4 will start and operate the fan at the constant
speed set in CW Speed menu until it receives a new valid fan speed (30% - 100%) from a
BMS. The constant speed is controlled by outputting a constant voltage to the fan speed con-
troller.
 ThefanspeedwillautomaticallyincreasetothemaximumfanspeedsetinMODULATEMAX
 menuwhenreheatorhumidicationisrequired.ThefanspeedwillreverttotheBMScon-
 trolledfanspeedsettingwhentheunitstopscallingforreheatorhumidication.
WARNING: IF CUSTOMER DECIDES TO USE THIS FAN SPEED CONTROL MODE (FAN
SPEED CONTROLLED BY BMS), DATA AIRE WILL NOT BE RESPONSIBLE FOR ANY EF-
FECTS, MALFUNCTIONS OR SPACE CONTROL CONDITIONS CAUSED BY THIS
SELECTION.
3. Speed Proportional to CW Valve (Vlv. Pos. Speed)
On units where proportional fan speed control based on the CW valve position is required, the
 maximumfanspeedisprogrammedinMODULATEMAXmenu,andtheminimumfanspeed
 asapercentageofthemaximumfanspeedisprogrammedviaMODULATEMINspeedmenu.
 EXAMPLE:Assumeafanwithaspeedcapacityof1750RPM,amaximumdesignfanspeedof
 1501RPMandaminimumdesignfanspeedof901RPM.MenuModulateMaxwouldbeset
to 1501/1750 = 0.8577 or 86%, and menu Modulate Min would be set to 901/1501 = 0.6003 or
60%.
When the fan starts, it will operate at the minimum fan speed. As the chilled water valve opens,
the fan speed will modulate proportionally based on the CW valve position from the minimum
 fanspeed(whentheCWvalveisfullyclosed)tothemaximumfanspeed(whentheCWvalve
is fully open).
 Thefanwilloperateatthemaximumprogrammedspeedwhentheunitcallsforreheator
 humidication.
Water valve action menu (Wtr Vlv Action) can be chosen for reverse acting valves. With this

Data Aire dap 4 Specifications

General

Brand	Data Aire
Model	dap 4
Category	Control Unit
Language	English