Venmar V10 Anleitung zur Fehlerbehebung PDF herunterladen (Seite 8)

VCES-DDC-IOM-1C

Adjust the following setpoints:

#124 – Enthalpy Free Cooling Setpoint

• Limits: 10–70 Btu/lbs [23–163 Joules/Gram]

• Factory set: 20 Btu/lbs

• BACnet variable: AV45

• Function: The enthalpy free cooling setpoint is the

measured enthalpy that the unit will go into free

cooling.

#125 – Enthalpy Free Cooling Span

• Limits: 5–20 Btu/lbs [11–46 Joules/Gram]

• Factory set: 5 Btu/lbs

• BACnet variable: AV46

• Function: The enthalpy free cooling span is the differ-

ential above and below the free cooling setpoint.

#126 – Enthalpy Free Cooling Reset

• Limits: 0–100%

• Factory set: 50%

• BACnet variable: AV47

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

centage of the span value under the setpoint.

Differential Enthalpy (On/Off)

If the outside air temperature is above the summer set-

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

than return air enthalpy and in the enthalpy free cooling

setpoint range, the wheel stops.

Adjust the following setpoints:

#124 – Enthalpy Free Cooling Setpoint

• Limits: 10–70 Btu/lbs [23–163 Joules/Gram]

• Factory set: 20 Btu/lbs

• BACnet variable: AV45

• Function: The enthalpy free cooling setpoint is the

measured enthalpy that the unit will go into free

cooling.

#125 – Enthalpy Free Cooling Span

• Limits: 5–20 Btu/lbs [11–46 Joules/Gram]

• Factory set: 5 Btu/lbs

• BACnet variable: AV46

• Function: The enthalpy free cooling span is the differ-

ential above and below the free cooling setpoint.

#126 – Enthalpy Free Cooling Reset

• Limits: 0–100%

• Factory set: 50%

• BACnet variable: AV47

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

centage of the span value under the setpoint.

Variable Free Cooling (Dry Bulb Setpoint Wheel VFD

Modulation)

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 supply

air temperature setpoint, the wheel modulates to the

wheel leaving temperature setpoint.

Dx Cooling, WSHP Cooling, One Compressor,

Optional VRC

(Discharge Air Temperature

Control)

If the outside air temperature is above the summer set-

point (selectable) and if the coil leaving air temperature

rises above the coil leaving air temperature setpoint (se-

lectable), the ﬁrst compressor starts. Modulate compressor

to coil leaving air temperature setpoint. Reheat heats up

the supply air to the cooling setpoint (if equipped).

Dx Cooling, WSHP Cooling, Two Compressors,

Single Compressor, Two-stage (Discharge Air

Temperature Control)

If the outside air temperature is above the summer set-

point (selectable) and if the coil leaving air temperature

rises above the coil leaving air setpoint (selectable), the

ﬁrst compressor starts. If more cooling is needed based

on the coil leaving air temperature setpoint, after staging

delay, the second compressor starts. Reheat heats up the

supply air to the cooling setpoint (if equipped).

Dx Cooling, WSHP Cooling, Two Compressors,

First Compressor VRC (Discharge Air

Temperature Control)

If outside air temperature is above summer setpoint (se-

lectable), and if coil leaving air temperature rises above coil

leaving air setpoint (selectable), ﬁrst compressor starts and

modulates to maintain setpoint. If more cooling is needed

based on coil leaving air temperature setpoint, after stag-

ing delay, second compressor starts. The ﬁrst compressor

will continue to modulate to maintain coil leaving air tem-

perature. Reheat heats up supply air to cooling setpoint (if

equipped)

Dx Cooling, WSHP Cooling, One Compressor,

Optional VRC (Room Air Temperature Control)

If the outside air temperature is above the summer set-

point (adjustable) and if the (return) room air temperature

rises above the summer zone setpoint and the coil leaving

air temperature is above the coil leaving setpoint, the ﬁrst

compressor starts. Compressor modulates to coil leaving

air temperature setpoint (adjustable). This continues until

(return) room air temperature is satisﬁed.

Dx Cooling, WSHP Cooling, Two Compressors

or Two-stage Single Compressor (Room Air

Temperature Control)

If the outside air temperature is above the summer set-

point (selectable) and if the (return) room air temperature

rises above the summer zone setpoint and the coil leaving

air is above the coil leaving setpoint, the ﬁrst compressor

starts. If more cooling is needed, based on the coil leav-

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