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12
PA-Series
ERV
1.2.7 Four Ducts are Required
u
Outside Air Duct handles Supply Air entering the ERV.
u
Fresh Air Duct handles Supply Air leaving the ERV.
u
Return Air Duct handles Exhaust Air entering the ERV.
u
Exhaust Air Duct carries the Exhaust Air from the ERV to the outside of the building.
1.2.8 Special Considerations for Outside Air and Exhaust Air Ducts
Proper location and construction of these ducts are critical to the safety and proper function
of the sytem. The exhaust outlet and outside air inlet on the outside of the building should be
separated to avoid cross-contamination.
NOTE: Some
jurisdictions may
allow less separa-
tion, or may require more.
Check with your local code
officials.
Danger of carbon monoxide poisoning! Outside air intake should be 10' (minimum) away from
sources of carbon monoxide or other toxic gases such as chimneys, furnace, or water heater
exhausts.
Do not locate outside air intake where vehicles may be serviced or left idling. Do not locate the
outside air intake inside an enclosed space.
WARNING
NOTE: The exhaust
outlet should not
dump air into an
enclosed space or
any other structure. The
inlets and outlets should
be screened against
insects and vermin and
shielded from the weather
to prevent the entry of rain
or snow.
Danger of Damage Due to Condensation in or on Ducts to Outside.
Both ducts connecting the unit to the outside must be insulated with sealed vapor barriers inside
and out to prevent condensation and/or freezing inside the insulation or on the duct surface.
CAUTION
1.2.9 Select the Airflow Path Configuration
Four basic airflow configurations are possible with the PA-Series. See Airstream and Filter
Arrangements section on pages 18–19.
Some airflow arrangements result in lower energy-recovery performace and require derating.
CAUTION
1.2.10 Design the Plenums
Duct plenums will be required, equal to the face width of the PA unit. See dimension drawing
at the begining of the manual. In some cases the plenums may reduce to the size of the unit
inlet openings. Design the plenums for low velocity to minimize pressure drop and achieve good
airflow distribution into the unit.
1.3 SYSTEM DESIGN—BLOWER DESIGN ISSUES
1.3.1 Blower Location
Two blowers will be required: one for the air to be exhausted from the building, another for the
fresh air to be brought into the building. See Figures 1.3.0–1.3.3 on the following pages.
SYSTEM DESIGN
