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DN-Series Integrated Programmable Controls
DOAS
62
6.5.3.2 VRF Cooling Operation
This type of cooling modulates a 0–10VDC output using PI control to maintain the cooling
setpoint. The KP and Ti can be adjusted to fine tune the control. The NO4 cooling enable
contact is engaged whenever the cooling demand is at 1% or higher.
6.5.3.3 VRF Heating Operation
This type of heating modulates a 0–10VDC output using PI control to maintain the heating
setpoint. The KP and Ti can be adjusted to fine tune the control. The NO4 cooling enable
contact is engaged whenever the heating demand is at 1% or higher.
TEMPERING CONTROL
6.5.3.4 VRF Auxiliary Heat
If you selected VRF and Mod, the unit allows you to use an 0–10VDC auxiliary heat source when
the outdoor temperature is very cold. The VRF Lowest OA setting at the bottom of this screen.
The unit will switch to the auxiliary heat source below that temperature. The controller will run
a PI control to maintain the heat setpoint with the aux heat instead of the heat pump. The NO1
heating enable contact is engaged whenever the heating demand is at 1% or higher in
this mode.
Based on whether the unit is in heating or cooling mode, the controller will set the tempering
mode output in the correct position according to this setting. The minimum and maximum vales
are also set here, as well as whether the cooling minimum demand coincides with the analog
minimum or maximum.
