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8
EV-Series Indoor
ERV
OVERVIEW
1.0 OVERVIEW
NOTE: This unit is
an Energy Recovery
Ventilator, or ERV.
It is commonly referred to
throughout this manual as
an ERV.
1.1 DESCRIPTION
2.0 COMPONENT DESCRIPTIONS
2.2 ENTHALPIC CORES
2.1 CABINET
All EV450IN ERVs use a static-plate enthalpic core. The enthalpic cores transfer both latent and
sensible energies between the airstreams. Gasketing is pre-installed on the cores and must be
positioned to provide a proper air seal. For information on annual maintenance of the cores, see
Section 7.0 Maintenance in this manual.
The cabinet for the EV450IN is made of 20 gauge galvanized steel and has 1" thick high-
density, foil-backed insulation on the inside. Units are available in either single-wall or double-
wall construction. Doors are hinged and are fitted with stainless steel machine screws through
the faces to prevent accidental opening of the doors when the unit is in operation.
The EV450IN Energy Recovery Ventilator is a device for recovering both sensible energy (heat)
and latent energy (moisture) from the Exhaust Air from an Occupied Space and injecting
those energies into an incoming Outside Air stream. It accomplishes this task by forcing the
two airstreams through enthalpic cores, where the energy exchange takes place. The two
airstreams pass through the enthalpic cores at right angles and the airstreams never mix
together. See Section 2.2 Enthalpic Cores in this manual.
Each ERV has two electric blowers, one for each airstream. Fan speeds can be either single
speed, or they can have electronically commutated motors. There are a number of different
control devices available to control the operation or speed of the unit fans.
There are two types of EV450 units, one for indoor installations and one for rooftop, or outdoor,
installation. This manual is for the EV450IN, which is the indoor unit. For information on the
outdoor version of this product, see the
EV450RT Installation and Operation Manual
.
These ERVs are commonly installed as part of an air handling system that provides heating and
cooling of Supply Air. They can also be installed to operate as stand-alone devices when ducted
directly to and from the Occupied Space.
Each unit has an integral 24 VAC power supply that is used internally and can also be used as a
power source for other optional control devices.
The EV450IN units are low-maintenance, requiring periodic replacement of the air filters, and
annual vacuuming of the enthalpic cores. See Section 7.0 Unit Maintenance in this manual.
IMPORTANT
It is important to understand and use the equipment airstream terminology as it is used in this
manual. The airstreams are defined as:
u
OUTSIDE AIR (OA): Air taken from the external atmosphere and, therefore, not previously
circulated through the system.
u
FRESH AIR (FA): Air that is downstream of the enthalpic cores and is ready for conditioning or
for return to the Occupied Space.
u
RETURN AIR (RA): Air that is returned to the ERV from a conditioned space.
u
EXHAUST AIR (EA): Air that is removed from a heating or cooling appliance or from the Occu-
pied Space and discharged.
