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VCES-DDC-IOM-1C

being used then you must not provide any jumpers to ter-

minals 304, 305, 306, 307 or 308.

The remote unit control multi-state variable is used to en-

able the unit through a Bacnet interface. Set MV12 to:

• 2 for unoccupied mode.

• 4 for occupied recirculation mode (optional).

• 6 for unoccupied recirculation mode (optional).

• 10 for ventilation mode.

The VHC unit can be conﬁgured to control building tem-

perature a variety of ways. Adjust #153 – Zone Conﬁgura-

tion to change temperature control to discharge air, room

air or return air control. Default settings from factory allow

the unit to be controlled by discharge air temperature.

Adjust the following setpoint:

#153 – Zone Conﬁguration

• Limits: NO, RM, RET

• Factory set: NO

• BACnet variable: MV11 function – Zone conﬁgura-

tion allows the unit to be used for zone heating and

cooling.

– NO: No zone control (discharge only)

– RM: Room air zone control (BacStat II)

– RET: Return air zone control (RA temp sensor)

Discharge Air Temperature Control

(MV11 = NO)

This type of control is used when the VHC is required to

maintain a discharge temperature only. The BacStat will

not provide room control in this mode. An optional ther-

mostat may be used to provide additional heating or cool-

ing when connected to the heating override or cooling

override terminals on the FW terminal strip (see Override

Contact Control (Optional)).

Adjust the following setpoints:

#107 – Cooling Setpoint

• Limits: 50–80°F [10–27°C]

• Factory set: 60°F

• BACnet variable: AV10 function – The cooling set-

point is the temperature that the reheat will heat the

supply air up to (summer mode only).

#115 – Coil Leaving Setpoint

• Limits: 40–65°F [4–18°C]

• Factory set: 55°F

• BACnet variable: AV143 function – The coil leav-

ing setpoint is the temperature that the cooling coil

will cool the coil leaving air temperature down to

during discharge air temperature control (summer

mode only).

#111 – Heating Setpoint

• Limits: 50–105°F [10–40°C]

• Factory set: 80°F

• BACnet variable: AV20

• Function: The heating setpoint is the temperature

that the post heat will heat the supply air up to dur-

ing discharge air temperature control (winter mode

only).

Room Air Temperature Control (MV11 = RM)

The BacStat must be mounted in the room for this type of

control.

This type of control is used when you want to maintain a

room temperature. The VHC will heat/cool based on the

BacStat temperature. An optional thermostat can be used

to provide additional heating or cooling when connected

to the heating override or cooling override terminals on

the FW terminal strip (see Override Contact Control (Op-

tional)).

Adjust the following setpoints:

#147 – Summer Zone Setpoint

• Limits: 60–80°F [15–25°C]

• Factory set: 70°F

• BACnet variable: AV84 function – The summer zone

setpoint is the room or return air setpoint for sum-

mer mode.

#150 – Winter Zone Setpoint

• Limits: 60–80°F [15–25°C]

• Factory set: 70°F

• BACnet variable: AV87

• Function: The winter zone setpoint is the room or re-

turn air setpoint for winter mode.

Return Air Temperature Control

(MV11 = RET)

This type of control is used when you want to maintain

a return temperature. This application is typical for VHC

units providing air to several rooms. The VHC will heat/

cool based on the return air temperature. An optional

thermostat can be used to provide additional heating or

cooling when connected to the heating override or cooling

override terminals on the FW terminal strip (see Override

Contact Control (Optional)).

Temperature Control Conﬁguration

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