19
Drains
Connect the drain pans in the bottom of the HRV to a
drain line fastened to the holes provided. Create a "P"
trap to prevent odors from being drawn through. Make
sure the drain line slopes down to drain properly and if
this is not possible a condensate pump will be required
for removal of the water. Note that stagnant water is a
leading cause of indoor air quality problems; confirm
drainage after installation by pouring water into trays.
Drain line must be installed where it will not freeze.
The
Ductwork
System
A well designed ducting system will allow the HRV to
operate at its maximum efficiency. Avoid the use of
under-sized ducting and sharp radius bends and tees
which can significantly increase the system pressure
drop and reduce the air flows.
NOTE: Fully insulated ducting with an integral vapor
barrier must be used on all runs passing through
unheated areas in order to avoid condensation problems
and energy losses from the air streams.
* Consult
local
Codes
To minimize pressure drop and noise, galvanized metal
ducts sized for 725 fpm (3.68 m/s) (maximum velocity)
are recommended. Keep ducting as short as possible and
use a minimum of elbows and tees. Connecting sections
and shorter runs may be flexible ducting one size larger
than the metal duct. Use flexible duct connectors at the
HRV to avoid noise transmission.
All duct joints must be secured with screws, rivets or
duct sealant and sealed with aluminum duct tape to
prevent leakage.
Outside
Weatherhoods
The 1500E-ECM is shipped with 2 weatherhoods inside
the cabinet which attach to the outer ends of the
cabinet using bolts provided. The 1500I-ECM requires
hoods to be built elsewhere and provided by the
contractor.
NOTE: It is extremely important to design and install
the fresh air intake in an area where the hoods will
gather the freshest air, free from restriction.
Recommended:
•
no less than 10 ft. (3 m) apart from each other
•
at least 18 in. (46 cm) above ground level
•
away from sources of contaminants, such as
automobile exhaust fumes, gas meters, garbage
containers, cooling towers, etc.
•
not exposed to prevailing winds, whenever
reasonably possible.
The outside perimeter of the weatherhood must be
caulked to prevent leakage into the building.
The design and size of the weatherhoods or louvers
chosen by the installer must allow for adequate free
area. Water and snow penetration of the system is
minimized when the airflow does not exceed 750 FPM
(3.81m/s) free area velocity.
Ducting
from
the
Weatherhoods
Galvanized sheet metal ducting with sufficient cross
section with an integral single piece vapor barrier
should be used to connect the HRV to the
weatherhoods. All ducting must meet ULC Class 1 Fire
Rating.
A minimum R value of insulation should be equal to 4
(RSI 0.75), or as stated in local codes.
A good bead of high quality caulking (preferably
acoustical sealant) and taping with a high quality
aluminum foil tape is recommended to seal the duct to
both the HRV and the weatherhood.
Warm-side
Ducting
-
General
Ducting from the HRV to different areas within the
building should be galvanized metal whenever possible.
To minimize airflow losses in the ductwork system, all
ducts should be as short as possible and with as few
bends or elbows as possible. 45Þ elbows are preferred
to 90Þ elbows, whenever possible. Use Y tees instead
of 90Þ tees whenever possible.
All duct joints must be fastened securely and wrapped
with a quality duct tape to prevent leakage. We
recommend aluminum foil tape.
Ducting
-
General
