SystemAir SER 1100, Installation Manual

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Installing ducts going to / from outside
Installing the ducting to the weatherhoods
Outside weatherhoods
The weatherhoods must have built-in "bird" screens with 1/4 inch (6.35 mm) minimum mesh to prevent birds and rodents from entering into the
ductwork. Do not use smaller mesh as it will be very susceptible to plugging up. The preferred location of the weatherhoods is:
• No less than 10 ft. (3 m) apart from each other.
• At least 18 inches (457.2 mm) above snow line or ground level.
• Supply hood must be kept away from sources of contaminants, such as automobile exhaust fumes, gas meters, garbage cans, containers,
cooling towers, tar roofs, etc.
• Avoid prevailing winds, whenever reasonably possible.
The outside perimeter of the weatherhood must be sealed to prevent leakage into the building.
Careful consideration should be given to selecting an outside hood with a face velocity low enough so as not to encourage the migration of rain or snow
into the ductwork.
Ducting from the weatherhoods –To and From the ERV
Galvanized sheet metal ducting with sufficient cross section with an integral single piece of insulated wrap with vapor barrier should be used to connect
the ERV to the weatherhoods. Insulated flex duct may be used in moderation, if sized and installed properly. (Consult local codes)
A minimum R value of insulation should be equal to 4 (RSI 0.75) ,consult local codes.
All ducts should be sealed using a good bead of high quality caulking (preferably acoustical sealant) and a high quality aluminum foil tape, or other
approved duct sealant.
Installing Drain Line
Through normal operation and including defrost mode, the ERV may produce some condensation. This water should flow into a nearby drain, or be taken
away by a condensate pump. The ERV and all condensate lines must be installed in a space where the temperature is maintained above the freezing
point. A “P” trap should be made in the drain line. This will prevent odors from being drawn back up into the unit.
Remore the drain spout, invert it so it protrudes from the botton of the unit and re-install in order to connect a condensate drain
Install the drain hose, making a “P” trap
Caution:
A Drain and Tubing (included) must be installed for all HRV units. For ERV units, drain is not required,
however, it is recommended for climates where outdoor temperature typically remains below -25°C
(-13°F) combined with an indoor relative humidity higher than 40% for a period of 24 hours or several
days in arow.