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DN-Series Integrated Programmable Controls
DOAS
116
Dehumidification
and
Cooling Mode
Heating Mode
Vent Mode
Sensible
Cooling Mode
Design Dew Point
SYSTEM MONITORING
1. Dehumidification: Is the unit configured
for dehumidification? If so, is the unit in
dehumidification mode?
2. Heating: Is the unit configured for heating?
Is the outdoor air temperature lower than
the heating lockout temperature?
3. Cooling: Is the unit configured for cooling?
Is the outdoor air temperature higher than
the cooling lockout temperature?
4. If it in no other mode and the unit is on, it
will be in Ventilation Mode.
See the following sections for more information on these modes. The mode is determined in
this order:
DN-Series Integrated Programmable Controls
The current Tempering Mode is viewed at Binary Input 13 “Tempering_Mode.Val.” It is also an
output used for VRF applications. The tempering mode will show heating when in heating or
ventilation only mode, and cooling for cooling or dehumidification mode.
13.5.5.2 Heating Control
The heating control type is located at Multistate Input 4 “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 Analog Value 55 “Occ_HTG_SetP.Val” if adjustable setpoint
is chosen. Otherwise the setpoint is based on an outdoor temperature schedule. The type is
Multistate Input 6 “Heating_SetPtType_BN,” where 1 = Adjust and 2 = OA Reset. The acting
setpoint is Analog Input 8 “HTG_SetP_Adjusted.”
The heating output statuses are the following:
u
Binary Input 18 “Heating_Enable_1.Val” for stage one or modulating types where the demand
is greater than 0
u
Binary Input 57 “Heating_Enable_2.Val” for stage two
u
Analog Input 34 “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
Analog Value 34 “HeatingCommand_BMS” to set a value for the 0–10V output, where 0 is 0V
and 100 is 10V.
u
Binary Value 75 “Heating_Enable_1.Val” can also be controlled directly if needed.
