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DN-Series Integrated Programmable Controls
DOAS
126
SYSTEM MONITORING
13.9.3 Temperature and Humidity Around the ERV
The following are available:
u
Input Register 0 “OA_Temp.Val”
u
Input Register 2 “OA_Hum.Val”
u
Input Register 4 “RA_Temp.Vall”
u
Input Register 6 “RA_Hum.Vall”
u
Input Register 8 “EA_Temp.Val”
u
Input Register 10 “SA_Temp.Vall”
EA
OA
RA
SA
CA
13.9.4 Fan Control
The supply fan control type method can be viewed at Input Register 42 “SF_ControlType_BN.”
The valid values are 0 = Constant Speed, 1 = Supply Airflow, 2 = Duct Static Pressure, 3 =
CO2/VOC, 4 = CO2/VOC Flow.
The corresponding settings are as follows:
u
Constant Speed setpoint is Holding Register 4 “SF_ConstantSpeedSetP.Val”
u
Supply Airflow setpoint is Holding Register 6 “SF_FlowControlSetP.Val”
u
Duct Static setpoint is Holding Register 8 “SF_DuctStaticSetP.Val”
u
CO2/VOC setpoint is Holding Register 12 “SF_CO2_VOCSetP.Val”
u
CO2/VOC Flow ramp set at Holding Registers 52, 54, 56, and 58.
OA CFM SETPOINT
1400
1200
1000
800
0
200
400
600
0
1200
1000
800
600
400
200
The command to the fan is read at Input Register 20 “SF_Command.Val.” The feedback from
the current sensor is read at Discrete Input 3 “SF_Status.Val.” The actual flow rate is viewed at
Input Register 12 “OA_Flow_Rate.Val.”
The exhaust fan control type method can be viewed at Input Register 43 “EF_ControlType_BN.”
The valid values are 1 = Constant Speed, 2 = Exhaust Airflow, 3 = SF Command Tracking, 3 =
SF Flow Tracking, 4 = Return Static Pressure.
The corresponding settings are as follows:
u
Constant Speed setpoint is Holding Register 16 “EF_ConstantSpeedSetP.Val”
u
Exhaust Airflow setpoint is Holding Register 18 “EF_FlowControlSetP.Val”
u
Exhaust Fan Tracking setpoint is Holding Register 20 “EF_SF_TrackingSetP.Val”
u
Return Static setpoint Holding Register 22 “EF_ReturnStaticSetP.Val”
The command to the fan is read at Input Register 22 “EF_Command.Val.” The feedback from
the current sensor is read at Discrete Input 4 “EF_Status.Val.” The actual flow rate is viewed at
Input Register 14 “EA_Flow_Rate.Val.”
