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VCES-DDC-IOM-1C

Ventilation

On a call for occupied ventilation (occupancy contact closed):

• Wheel starts (not in free cooling).

• Recirculation damper closes (if equipped).

• Exhaust air damper opens.

• Outside air damper opens.

• After exhaust air damper opens; exhaust blower starts.

• After outside air damper opens; supply blower starts.

Occupied Recirculation

On a call for occupied recirculation (if equipped) (occupied

recirculation contacts closed):

• Wheel starts (not in free cooling).

• Recirculation damper closes.

• After exhaust air damper opens; exhaust blower starts.

• After supply air damper opens; supply blower starts.

• Return air damper opens.

• Outside and exhaust air dampers modulate to the

damper minimum setpoints.

Unoccupied Recirculation

On a call for unoccupied recirculation (if equipped) (unoc-

cupied recirculation contacts closed and a call for cooling

or heating):

• Wheel stops.

• Recirculation damper opens.

• Exhaust air damper closes.

• Outside air damper closes.

• Supply blower starts.

Summer/Winter Changeover

The summer setpoint, parameter #104, is the tempera

ture setpoint that the outdoor air temperature sensor

must reach in order to change from heating to cooling or

visa versa. When the outdoor air temperature is above this

setpoint, you will be in summer mode and your heating

components will be disabled. When the outdoor air tem-

perature is below this setpoint, you will be in winter mode

and your cooling components will be disabled.

Adjust the following setpoints:

#104 – Summer Setpoint

• Limits: 5–80°F [−15–27°C]

• Factory set: 60°F

• BACnet variable: AV5

• Function: The summer setpoint is the temperature for

the unit to changeover between summer and winter

modes of operation.

#105 – Summer Span

• Limits: 1–8°F [0.5–5°C]

• Factory set: 4°F

• BACnet variable: AV6

• Function: The summer span is the differential above

and below the summer setpoint.

#106 – Summer Reset

• Limits: 0–100%

• Factory set: 50%

• BACnet variable: AV7

• Function: The summer reset is the shift in the span

below the summer setpoint by X%.

Cooling

Free cooling

Free cooling can be disabled by adjusting parameter #130.

Adjust the following setpoint:

#130 – Free Cooling Select

• Limits: On/off

• Factory set: On

• BACnet variable: BV61

• Function: This variable enables or disables free cooling.

Dry Bulb Setpoint (On/Off)

If the outside air temperature is above the summer set-

point (selectable) and if the outside air temperature is less

than the return air temperature and less than the free

cooling temperature setpoint range, the wheel stops.

Adjust the following setpoints:

#127 – Dry Bulb Free Cooling Setpoint

• Limits: 40–80°F [5–27°C]

• Factory set: 65°F

• BACnet variable: AV60

• Function: The dry bulb free cooling setpoint is the

temperature that the unit will go into free cooling.

#128 – Dry Bulb Free Cooling Span

• Limits: 4–20°F [2–12°C]

• Factory set: 4°F

• BACnet variable: AV61

• Function: The dry bulb free cooling span is the differ-

ential above and below the free cooling setpoint.

#129 – Dry Bulb Free Cooling Reset

• Limits: 0–100%

• Factory set: 50%

• BACnet variable: AV62

• Function: The enthalpy free cooling reset is the per-

centage of the span value under the setpoint.

Setpoint Enthalpy (On/Off)

If the outside air temperature is above the summer set-

point (selectable) and if the outside air enthalpy is in the

enthalpy free cooling setpoint range, the wheel stops.

VHC Sequence of Operation

IMPORTANT

The following conditions may not occur in the exact

order as listed.

1 2 3 4 5 6 7 8 9 10 11 12 ... 23 24

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