Greenheck Fan HEAT RECOVERY UNIT WITH EVAPORATIVE COOLING HRE-20 - Manual (Page 37)

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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 figure at right) .
Clean filters by rinsing with a mild detergent in warm
water .
Internal Filter Maintenance
The HRE 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 at
right 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 ® .
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
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
ROUTINE MAINTENANCE
Filter Size and Quantities
Model
Internal
Filter Size
Quantity
Supply
Quantity
Exhaust
HRE-20 20 in . x 20 in . 2 2
HRE-45 20 in . x 25 in . 3 3
HRE-55 16 in . x 25 in . 6 6
HRE-90 20 in . x 20 in . 8 8
Bearings
Most bearings are permanently lubricated and require not 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 zert 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 .