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VCES-DDC-IOM-1C

ing air temperature setpoint, after staging delay, second

compressor starts. This process continues until the (return)

room air temperature is satisﬁed.

Dx Cooling, WSHP Cooling, Two Compressors,

First Compressor VRC

(Room Air Temperature

Control)

If outside air temperature is above summer setpoint (se-

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

summer zone setpoint and coil leaving air is above coil

leaving setpoint, ﬁrst compressor starts and modulates to

maintain setpoint. If more cooling is needed based on coil

leaving air temperature setpoint, after staging delay, sec-

ond compressor starts. The ﬁrst compressor will continue

to modulate to maintain coil leaving air temperature. Re-

heat heats up supply air to cooling setpoint (if equipped).

Dehumidiﬁcation (Room Air Temperature Control)

If the outside air temperature is above the summer set-

point (selectable) and if the return (room) air humidity rises

above the return (room) air humidity setpoint, based on

optional room humidistat, the ﬁrst compressor starts. Re-

heat heats up the supply air to the cooling setpoint (select-

able). If more cooling is needed, based on the coil override

leaving air temperature setpoint, after the staging delay,

the second compressor starts (if equipped).

This process continues until the return (room) air humidity

is satisﬁed.

Chilled Water (Discharge Air Temperature Control)

If the outside air temperature is above the summer set-

point (selectable), the chilled water valve modulates to

maintain the coil leaving air temperature strategy to main-

tain the coil leaving air temperature setpoint (selectable).

Reheat heats up air to the cooling setpoint (if equipped).

Chilled Water (Room Air Temperature Control)

If the outside air temperature is above the summer set-

point (selectable) and if the room air temperature rises

above the room air setpoint, the chilled water valve modu-

lates based on a sliding supply air temperature strategy

to maintain the supply air between the summer zone set-

point and the minimum supply temperature setpoint.

Heating

Gas or Electric SCR (Discharge Air Temperature

Control)

If the outside air temperature is below the summer set-

point (selectable), the gas module is enabled. Gas burners

modulate to maintain the heating setpoint (selectable).

Gas or Electric SCR (Room Air Temperature

Control)

If the outside air temperature is below the summer set-

point (selectable), the gas module is enabled. If the (re-

turn) room air temperature drops below the winter zone

setpoint, the gas burners (or electric elements) modulate

based on a sliding supply air strategy to maintain the sup-

ply air between the winter zone setpoint and the maxi-

mum supply air temperature setpoint, until the room air

temperature is satisﬁed.

Gas or Electric Stage (Discharge Air Temperature

Control)

If the outside air temperature is below the summer set-

point (selectable), the electric post heater is enabled. The

heating elements stage to maintain the heating setpoint.

Gas or Electric Stage (Room Air Temperature

Control)

If the outside air temperature is below the summer set-

point (selectable), the electric post heater is enabled. If

the (return) room air temperature drops below the winter

zone setpoint, the heating elements modulate based on

a sliding supply air strategy to maintain the supply air be-

tween the winter zone setpoint and the maximum supply

air temperature setpoint, until the room air temperature is

satisﬁed.

Hot Water (Discharge Air Temperature Control)

If the outside air temperature is below the summer set-

point (selectable), the hot water valve modulates to main-

tain the heating setpoint (selectable).

Hot Water (Room Air Temperature Control)

If the outside air temperature is below the summer set-

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

drops below the winter zone setpoint, the hot water valve

modulates based on a sliding supply air strategy to main-

tain the supply air between the winter zone setpoint and

the maximum supply temperature setpoint, until the room

air temperature is satisﬁed.

IMPORTANT – COMPRESSOR SAFETY

If either non-freeze switch is made for over two minutes,

the last on compressor shuts down for lockout time

(selectable, minimum of ﬁve minutes). If the non-freeze

switch is on for another two minutes, then the ﬁrst on

compressor shuts down for lockout time. If the low pres-

sure switch has tripped three times, the compressor will

lock off until power is removed from the unit. If on either

circuit, the high pressure switch is made, their respective

compressor shuts down (manual reset required). There

is a minimum of a ﬁve minute anti-cycling time before

compressors will stage.

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Venmar V10 Guía para resolver problemas Pagina 9

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