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Product Overview
The VER units bring in fresh, outdoor air and remove
stale, exhaust air. Prior to discharging the exhaust air,
the energy recovery wheel transfers energy from the
exhaust air to the outdoor air at an efficiency of 70-
80%. Simply put, this unit preconditions the outdoor
air to save money on heating and cooling costs. These
particular units also have cooling and heating options
available after the recovery wheel to further condition
the fresh air.
Optional Subassemblies
Dampers
Backdraft dampers are always included as an integral
part of the exhaust hood assemblies. Motorized outdoor
air and return air dampers are optional and are factory-
mounted (and wired) at the intake.
Hot Water / Chilled Water Coils
Water coils can be used for a single purpose such
as heating or cooling, or their function can be
alternated between heating and cooling by changing
the temperature of the water flowing through the coil.
Depending on the application, it may be necessary to
use a glycol mixture to prevent the liquid from freezing.
The water coils are engineered to operate at pressures
up to 250 PSIG and temperatures up to 300°F, but
ancillary equipment such as valves and pumps will often
dictate lower operating temperatures. All water coils
are pressure tested at the factory with 450 PSIG of dry
nitrogen.
Packaged Direct Expansion (PDX)
The DX system comes fully charged from the factory
with refrigerant and is ready for installation upon arrival.
All units come standard with two compressors. This
allows for staging of compressors to meet a wider range
of outdoor air loads while reducing the amount of cycles
per compressor.
Integral Components
All units are provided with an expansion valve, hermetic
scroll compressor(s), liquid line filter drier, high pressure
manual reset cutout, low pressure auto-reset cutout,
time delays for compressor protection, service/charging
valves, moisture indicating sight glass, and optional hot
gas bypass. The compressors also come standard with
a crankcase heater for additional protection.
Split DX
The unit can be equipped with two evaporator coils
that will be connected to a separate condensing unit
(provided by others). Depending on controlling options,
the condensing unit will be controlled by others or could
receive a call for stage 1 and stage 2 of cooling with the
integral microprocessor controller. The microprocessor
controller will only provide a call for cooling, it will not
send a digital control signal to the compressors. Piping
components such as thermostatic expansion valve, filter
drier, sight glass, etc., shall be field-provided.
4
VersiVent Energy Recovery Ventilator
Electric Post-Heaters
The optional post-heater is used as a heat source for
the building and is integrated into the supply airstream.
A temperature sensor (with a field-adjustable set point)
is mounted in the supply airstream after the post-heater
to turn the post-heater on. A SCR heater allows for
an infinite amount of modulating control of the heat to
provide an accurate discharge temperature during the
call for heat.
As standard, the post-heater control panel is not single
point wired to the unit control center. Separate power
must be supplied to the post-heater disconnect (located
in unit control center). Electric heaters are available in
208, 230, 460, or 575 VAC (refer to heater nameplate for
voltage).
Indirect Gas Furnace
An optional indirect gas furnace may be installed and
provides supplementary heat to the building. Refer to
the PVF/PVG Indirect Gas-Fired Heat manuals provided
with the unit. A unit-specific wiring diagram is located
inside the furnace housing access door.
Outdoor Air Weatherhood
Outdoor air weatherhood will be factory-mounted.
Exhaust Air Weatherhood
The exhaust weatherhood is shipped separately as a
kit with its own instructions. Backdraft dampers are
always included as an integral part of the exhaust hood
assemblies.
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