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Model ERV Energy Recovery Unit
Fan Wheel & Fasteners
Wheels require very little attention when moving clean
air. Occasionally oil and dust may accumulate on the
wheel causing imbalance. When this occurs the wheel
and housing should be cleaned to assure smooth and
safe operation. Inspect fan impeller and housing for
fatigue, corrosion or wear.
Routinely check all fasteners, set screws and locking
collars on the fan, bearings, drive, motor base and
accessories for tightness. A proper maintenance
program will help preserve the performance and
reliability designed into the fan.
Bearings
Most bearings are permanently lubricated and require
no further lubrication under normal use. Normal use
being considered -20ºF to 120ºF and in a relatively
clean environment. Some bearings are re-lubricatable
and will need to be regreased depending on fan use.
Check your bearings for grease zerk fittings to find
out what type of bearing you have. If your fan is not
being operated under normal use, bearings should be
checked monthly for lubrication.
External Filter Maintenance
Aluminum mesh, 2-inch deep filters are located in the
supply weatherhood (if the weatherhood option was
purchased). Filters should be checked and cleaned
on a regular basis for best efficiency. The frequency
of cleaning depends upon the cleanliness of the
incoming air. These filters should be cleaned prior to
start-up.
To access these filters,
remove bottom bolt in the
access door on the side of
the weatherhood. Slide the
access door up and then pull
bottom out to remove door.
Then, slide the filters out (see
picture at right).
Clean filters by rinsing with
a mild detergent in warm
water.
Internal Filter Maintenance
The ERV units will typically be provided with 2-inch,
pleated filters in the outdoor air and exhaust
airstreams. These filters should be checked per
a routine maintenance schedule and replaced as
necessary to ensure proper airflow through the
unit. See table for pleated filter size and quantity
for each unit. Replacement filters shall be of same
performance and quality as factory installed filters.
Filter type must be pleated design with integral metal
grid. Two acceptable filter replacements are Aerostar
Series 400 or Farr 30/30
®
.
Filter Size and Quantities
Unit Size
Internal
Filter Size
Quantity
Supply
Quantity
Exhaust
ERV-251 16 x 25 1 1
ERV-361 16 x 20 2 2
ERV-521 16 x 25 3 3
ERV-581 16 x 20 6 6
ERV-522 16 x 25 7 7
ERV-582 20 x 25 6 6
All dimensions in inches.
Outdoor Air Filters: Access to the outdoor air filters
is through the door labeled as “Filter Access” on the
outdoor air side of the unit.
Exhaust Air Filters: Access to the exhaust air filters
is through the door labeled as “Filter Access” on the
exhaust air side of the unit.
Refer to Access Door Descriptions section for
additional information on filter locations.
Door Seal Maintenance
ERV-251, 361, 521, and 581: Closed cell foam
tape is installed on the perimeter of the door. Inspect
at least annually to ensure that the seal is still intact.
ERV-522 & 582: Slip-on type vinyl
seal is installed on the perimeter of
the door openings. Inspect at least
annually to ensure that seal is still
pliable and intact.
Outdoor air intake hood
mesh filter access
Accessing the Energy Recovery Wheel in
Models ERV-251, 361, 521 and 581
Disconnect power to the ERV. Remove access
panel(s) labeled “Energy Wheel Cassette Access”.
Unplug the wheel drive
motor. The center
channel must be
removed to access the
energy wheel cassette.
Use a 5/16 inch open
or closed wrench to
remove the three (3)
fasteners that hold the
center channel in place.
Pull the cassette halfway out as shown. (Except on
ERV-581, wheel is stationary).
When service is complete, reattach the center
channel before putting access panels back in place.
Energy Recovery Wheel Maintenance
Annual inspection of the energy recovery wheel is
recommended. Units ventilating smoking lounges
and other non-clean air spaces should have energy
recovery wheel inspections more often based upon
need. Inspections for smoke ventilation applications
are recommended bimonthly to quarterly until a
regular schedule can be established.
Access to wheel through
outdoor air filter door