Venmar V10 Guide de dépannage télécharger pdf (Page 10)

VCES-DDC-IOM-1C

WSHP Heating, One Compressor, Optional VRC

(Discharge Air Temperature Control)

If outside air temperature is below summer setpoint (se-

lectable), and if coil leaving air temperature rises above

heating setpoint (selectable), ﬁrst compressor starts. Mod-

ulate compressor to heating setpoint. Additional postheat

will heat up supply air if heating setpoint cannot be main-

tained (if equipped).

WSHP Heating, Two Compressors, or Two-stage

Single Compressor (Discharge Air Temperature

Control)

If outside air temperature is below summer setpoint (se-

lectable), and if supply air temperature rises above heat-

ing setpoint (selectable), ﬁrst compressor starts. If more

heating is needed based on heating setpoint, after staging

delay, second compressor starts. Additional postheat will

heat up supply air if heating setpoint cannot be main-

tained (if equipped).

WSHP Heating, Two Compressors, First

Compressor VRC (Discharge Air Temperature

Control)

If outside air temperature is below summer setpoint (se-

lectable), and if coil leaving air temperature rises above

heating setpoint (selectable), ﬁrst compressor starts and

modulates to maintain setpoint. If more cooling is needed

based on heating setpoint, after staging delay, second

compressor starts. The ﬁrst compressor will continue to

modulate to maintain coil leaving air temperature. Addi-

tional postheat will heat up supply air if heating setpoint

cannot be maintained (if equipped).

WSHP Heating, One Compressor, Optional VRC

(Room Air Temperature Control)

If outside air temperature is below summer setpoint (ad-

justable), and if (return) room air temperature drops below

winter zone setpoint and coil leaving air temperature is

below heating setpoint, ﬁrst compressor starts. Compres-

sor modulates to coil leaving air setpoint (adjustable). This

continues until (return) room air temperature is satisﬁed.

Additional post heat will heat up supply air if heating set-

point cannot be maintained (if equipped).

WSHP Heating, Two Compressors, or Two-stage

Single Compressor (Room Air Temperature Control)

If outside air temperature is below summer setpoint (se-

lectable), and if (return) room air temperature rises above

winter zone setpoint and coil leaving air is above heating

setpoint, ﬁrst compressor starts. If more cooling needed

based on heating setpoint, after staging delay second

compressor starts. This continues until (return) room air

temperature is satisﬁed. Additional post heat will heat

up supply air if heating setpoint cannot be maintained (if

equipped).

WSHP Heating, Two Compressors, First

Compressor VRC (Room Air Temperature Control)

If outside air temperature is below summer setpoint (se-

lectable), and if (return) room air temperature rises above

winter zone setpoint and coil leaving air is above heating

setpoint, ﬁrst compressor starts and modulates to main-

tain setpoint. If more cooling is needed based on heating

setpoint, after staging delay, second compressor starts.

The ﬁrst compressor will continue to modulate to maintain

coil leaving air temperature. Additional post heat will heat

up supply air if heating setpoint cannot be maintained (if

equipped).

WSHP Economizer Coil

If the outside air temperature is above summer setpoint

(adjustable) and if the water entering temperature is

below the economizer coil setpoint (adjustable) the econo-

mizer coil valve will modulate to maintain the coil leaving

air temperature. If the economizer coil valve is open 100%

for more than two minutes, then the mechanical cooling

will be allowed to stage on. The economizer coil valve will

remain open while in mechanical cooling until the water

entering temperature is above the economizer coil set-

point (adjustable).

With both the economizer coil and free cooling options, if

the outside air temperature is above summer setpoint and

is in the free cooling range, then the economizer coil valve

will close and temperature control will follow free cooling.

If the outside air temperature rises above the free cooling

range and the water entering temperature is below the

economizer setpoint (adjustable) then the economizer coil

valve will modulate and mechanical cooling will stage on

to maintain the coil leaving air temperature as above.

WSHP Freeze Protection

If the unit has a water leaving temperature sensor and this

temperature goes below the water leaving temperature

setpoint (adjustable) then the compressor is locked off and

the WSHP valve is opened.

WSHP Head Pressure Control

If the outside air temperature is above the summer set-

point (adjustable) and there is the demand for mechani-

cal cooling, the head pressure control valve will open to

100%. When the compressor starts, the valve will modu-

late to maintain the factory set head pressure setpoint.

The valve will be allowed to close to a minimum valve

setpoint of 50%. If the compressor has been off for 10

minutes then the valve will close.

If the outside air temperature is below the summer set-

point (adjustable) and there is a demand for mechanical

heating, the head pressure control valve will open fully

and remain open until the compressor has been off for 10

minutes.

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Venmar V10 Guide de dépannage Page 10

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