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DN-Series Integrated Programmable Controls
DOAS
128
SYSTEM MONITORING
13.9.5.2 Heating Control
The heating control type is located at Input Register 44 “HTG_ControlType_BN.” The valid
values are 1 = 0–10V, 2 = 10–0V, 3 = VRF, 4 = 1 stage, 5 = 2 stage, 6 = VRF+Mod, 7 = Dual
Temp Coil. The setpoint is Holding Register 38 “Occ_HTG_SetP.Val” if adjustable setpoint is
chosen. Otherwise the setpoint is based on an outdoor temperature schedule. The type is Input
Register 48 “Heating_SetPtType_BN,” where 1 = Adjust and 2 = OA Reset. The acting setpoint
is Input Register 46 “HTG_SetP_Adjusted.”
The heating output statuses are the following:
u
Discrete Input 6 “Heating_Enable_1.Val” for stage one or modulating types where the
demand is greater than 0
u
Discrete Input 13 “Heating_Enable_2.Val” for stage two
u
Input Register 36 “Heating_Command.Val” shows a percentage for the 0–10V output.
It is also possible for the BMS to take over total control of the 10–0V hot water valve signal out
to the controlled valve and heating output directly for special cases. All setpoints, etc. will be
ignored in this case. To do this, set the heating setting “Valve Control” to BMS on the screen, or
through Binary Value 74 “BMS_HW_Valve_Control.”
Then control the valve through
u
Holding Register 44 “HeatingCommand_BMS” to set a value for the 0–10V output, where 0 is
0V and 100 is 10V.
u
Coil 7 “Heating_Enable_1.Val” can also be controlled directly if needed.
13.9.5.3 Cooling Control
The cooling control type is located at Input Register 45 “CLG_ControlType_BN.” The valid
values are 1 = 1 Stage, 2 = 2 Stage, 3 = Cold Water Modulating, 4 = VRF, 5 = PDX. The
setpoint is Holding Register 40 “Occ_CLG_SetP.Vall.”
The cooling output statuses are the following:
u
Discrete Input 7 “Cooling_Enable_1.Val” for stage one or modulating types where the demand
is greater than 0
u
Discrete Input 8 “Cooling_Enable_2.Val” for stage two
u
Input Register 34 “Cooling_Command.Val” shows a percentage for the 0–10V output.
13.9.5.4 Dehumidification Control
u
If the cooling is currently being used for dehumidification, Discrete Input 15
“DehumidificationMode_ON” will be true.
u
Holding Register 36 “HGRH_Coil_LAT_Setp.Val” is the setpoint for dehumidification by
cooling. The actual value is shown in Input Register 28 “Cooling_LAT.Val” is the temperature
coming off the coil, if using reheat.
u
The unit will reheat to Holding Register 60 “HGRH_Unit_LAT_Setp.Val” if reheating.
u
Input Register 40 “HGRH_Command.Val” will show the command for HGRH. If used.
