Data Aire dap 4 - Page 99

99•dap4UserManual
3. Static Pressure Constant (Air Pressure) - Optional
In Static Pressure Constant mode, an optional differential pressure (DP) transducer is required
and connected to dap4 module to report the differential pressure across the unit (between sup-
ply and return air section).
 Whenstartedinthismode,thefanwillrstoperateattheconstantspeedsetinDXSpeed 
for 5 minutes. After that, the fan will proportionally increase or decrease the speed to maintain
the constant static pressure setpoint set in Static Air Pressure menu page, and the deadband
set in static band.
4. AirowConstant(Const.ow)-Optional
 Thisoptionrequiresafactoryinstalledairowowmeasurementkitandprogramming.
 Onunitswhereconstantdesignairowisrequired,anairowvalueisenteredintoairow 
SETPOINT on FAN AIRFLOW menu. In this mode, the fan will start and operate at this con-
 stantdesignairowallthetime.
5. AirowControlledbyBMS(BMSFlow)-Optional
 InAirowControlledbyBMSmode,thedap4willstartandoperatethefanattheconstantair-
 owsetinairowsetpointinFanAirowmenuuntilthedap4receivesavalidairowvalue
 (greaterthantheminimumallowedairowandlessthanthemaximumallowedairow)froma
 BMS.Thisoptionrequiresafactoryinstalledairowowmeasurementkitandprogramming.
 TheairowwillautomaticallyincreasetothemaximumairowsetinMaximumFlowwhen 
 reheatorhumidicationisrequired.TheairowwillreverttotheBMScontrolledairowsetting
 whentheunitstopscallingforreheatorhumidication.
WARNING: IF CUSTOMER DECIDES TO USE THIS FAN SPEED CONTROL MODE
(AIRFLOW CONTROLLED BY BMS), DATA AIRE WILL NOT BE RESPONSIBLE FOR ANY
EFFECTS, MALFUNCTIONS OR SPACE CONTROL CONDITIONS CAUSED BY THIS
SELECTION.
6. Mod to Rack
See RackSense 32 User’s Manual for details.