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10
HE-Series Indoor
ERV
OVERVIEW
MODEL
DESCRIPTION OF DUCT CONNECTION CONFIGURATION
HE4XINV
Room Air [RA] and Outside Air [OA] enter on the opposite side of the unit.
FA
OA
EA
RA
HEIN except 6x 8x, LEIN
INV
FIGURE 1.2.0 AIRFLOW ORIENTATION
2.0 COMPONENT DESCRIPTIONS
2.2 ENTHALPIC CORES
2.1 CABINET
All HE4XINV ERVs use four static-plate enthalpic cores. The enthalpic cores transfer both latent
and sensible energies between the airstreams. Cores are bi-directional and may be rotated in
their mounting hardware, but care must be taken to install the correct side of the core toward
the unit door. 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 HE4XINV 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. Doors may be
completely removed by removing the hinge pins. All units are equipped with adjustable-height
leveling legs for purposes of leveling the unit. Duct flanges are provided at all four airstream
openings for connection of field-supplied ductwork.
2.3 FAN/MOTOR ASSEMBLIES
There are 2 fan and motor assemblies in each ERV. The fans are belt-driven. All fans have an
adjustable sheave on the electric motor for purposes of adjusting the fan speed. The motors
require periodic inspection and lubrication. For information on adjusting sheaves, see Section
7.0 Maintenance.
Low air flow can cause
fouling of the enthalpic
cores. The ERV must never
be operated without clean
filters in place and minimum
airflow must be greater than
250 CFM per full-sized core.
CAUTION
The airflow configuration is indicated by digit 9 of the Configuration Code.
1.2 AIRFLOW
