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Premium Commercial Controls
ERV
TEMPERING CONTROL
6.4.3.4 VRF Monitoring
This screen is available for monitoring the system in
Unit Status
.
The VRF status values are shown. Multiple values may be true.
MESSAGE
MEANING
Cool Locked Out by OA
The cooling OA lockout is lower than the OA temperature.
Heat Locked out by OA
The heating OA lockout is higher than the OA temperature.
Lockout Overlap
The OA lockouts for heating and cooling overlap. (No vent mode.)
The heating takes preference.
Econ Only
If economizer is open less than 100%.
Econ Mode
If in economizer mode.
Unit OFF
Unit is off.
Aux Heat Mode
Auxiliary Heat is used.
VRF On
VRF is used (rather than aux heat).
IN HEAT MODE
Valve is positioned for heat mode.
IN COOL MODE
Valve is positioned for cool mode.
6.4.4 Dual Temperature Coil
The dual temperature coil is a coil which provides heating in the winter and cooling in the
summer by changing the temperature of the fluid in the coil. To do this, the coil needs to know
what type of fluid (hot or cold) is being provided. It will lock out cooling in heat mode and vice
versa. The only method for this is a BMS command. Therefore, the system must be equipped
with a BMS system for this control.
The BACnet objects for this are:
u
BV 60 BMS_SetHeatCool: 0 = No, 1 = Yes. This enables the control. This can also be set in
the screen below.
u
BV 61 BMS_HeatCoolMode: 0 = Heat, 1 = Cool. This sets the type. The current setting can
be seen in the screen below for troubleshooting.
The Modbus Registers for this are:
u
Coil 4 BMS_SetHeatCool: 0 = No, 1 = Yes. This enables the control. This can also be set in
the screen below.
u
Coil 5 BMS_HeatCoolMode: 0 = Heat, 1 = Cool. This sets the type. The current setting can
be seen in the screen below for troubleshooting.
This type requires cooling type CW Mod and heating type DualTempCoil.
