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ERV
SYSTEM MONITORING
12.9.4 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, 4 =
SF Flow Tracking, 5 = 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.”
12.9.5 Tempering Control
The ERV unit may provide heating and cooling/if ordered as such. For heating and/or cooling,
there will be a conditioned air temperature sensor which measured the air coming out of the
unit as Input Register 32 “CA_Temp.Val.”
12.9.5.1 Determining Tempering Mode
To determine the mode in which the unit is operating, the following values are considered:
u
Holding Register 26 “HeatLockoutTemp”
u
Holding Register 24 “CoolLockoutTemp”
In addition, the BMS has the potential to use one more setting to determine whether the unit
will lock out heating or cooling functions. This is required for the dual temp systems and may
be useful for other situations. The Coil 4 “BMS_SetHeatCool” must be true and then the mode
is set through Coil 5 “BMS_HeatCoolMode” where 0 =Heat and 1 = Cool. The BMS mode is
shown for troubleshooting.
