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1.800.627.4499
EV-Series Indoor
ERV
INSTALLATION
NOTE: Ducts inside
a building that are
connected to the
outside must be insulated
with a sealed vapor barrier
on both the inside and the
outside of the insulation.
5.1.3 Inside Ductwork System
Use 8" x 12" to 10" round transitions (45EVT10) accessory (or fabricate equivalent) to connect
10" duct to Room Air and Fresh Air Ports on unit. Position duct adapters over openings. Install
with supplied self-drilling screws.
OR
Use 8" x 12" duct flange (45EVDF) accessory to connect 8" x 12" duct to Room Air and Fresh
Air Ports on unit. Position duct adapters over openings. Install with supplied screws.
Or fabricate equivalent, by forming a flange on the first duct section and screw it to the
EV450IN. Make sure appropriate duct sealant or tape is used to provide an air tight seal.
Most installations will not require complicated duct systems to provide good ventilation
performance. If ventilating several spaces, evaluate whether the air in the spaces is regularly
mixed by the heating/cooling system; if not, provide a room air pick-up and fresh air supply in
each space. If air is regularly mixed by the heating/cooling system, one room air pick-up and
one fresh air supply may be all that is needed.
5.1.3.1 Connecting to an Existing Air-Circulation System
It is often convenient and effective to connect the Fresh Air duct from the EV450IN to a return
duct of an existing heating/cooling system. This way, whenever the heating/cooling system is
running, fresh air from the EV450IN is distributed throughout the area served by the heating/
cooling system.
Connect the Fresh Air duct to a branch return duct at some distance from the heating/cooling
system’s air handler. This minimizes the amount of air that the air handler can pull through the
EV450IN when outside air ventilation is not desired.
If the EV450IN is running when the main air handler is not, fresh air will flow into the space
through the branch’s return grille. Choose the return branch for your connection accordingly
(see next paragraph).
5.1.4 Ducting Fresh Air Directly into Space
In cold or hot weather, the fresh air will be somewhat cooler or warmer than the room air
(though always much closer to room temperature than the outside air!). Avoid complaints by
locating the Fresh Air supplies where they will not blow directly on occupants.
5.2 INSTALLING THE UNIT
The EV450IN weighs approximately 199 lbs. It is the installer’s responsibility to make sure
that the screws or bolts used for securing the units are properly selected for the loads and
substrates involved. Secure the EV450IN so that it cannot fall or tip in the event of accident,
structural failure or earthquake.
Do not stand on the unit. Do not stack or store items on the unit when installed.
To avoid motor bearing damage and noisy and/or unbalanced blowers, keep drywall spray,
construction dust, etc., out of unit.
CAUTION
