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ERV
56
TEMPERING CONTROL
6.4.3 VRF
This type requires cooling type VRF and heating type VRF
6.4.3.1 VRF Mode
The mode is determined by the outdoor temperature and the heating and cooling lockout
temperature settings.
6.4.3.2 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.
6.4.3.3 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.
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.
