Drains
Connect the stainless steel drain pans in the bottom of the HRV to a drain line fastened to the holes provided. See pg.10 for location of the drain pans and the drain connections. Create a "P" trap to prevent odours from being drawn through. Make sure the drain line slopes down to drain properly and if this is not possible a con- densate 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 undersized 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 vapour 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 1200 fpm (6.09 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 2500EFD is shipped with 2 weatherhoods inside the cabinet which attach to the outer ends of the cabi- net using bolts provided. The 2500IFD requires hoods to be built elsewhere and provided by the contractor.
The 2500EFD has
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 min- imized 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 vapour barrier should be used to connect the HRV to the weather- hoods. 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 alu- minum foil tape is recommended to seal the duct to both the HRV and the weatherhood.
Warmside 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. 45˚ elbows are preferred to 90˚ elbows, whenever possible. Use Y tees instead of 90˚ tees whenever possible.
All duct joints must be fastened securely and wrapped with a quality duct tape to prevent leakage. We recom- mend aluminum foil tape.
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