Greenheck Fan ERV-521, ERV-581 manual Fan Wheel & Fasteners, Bearings, External Filter Maintenance

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.

Filter Size and Quantities

Unit Size	Internal	Quantity	Quantity
	Filter Size	Supply	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.

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.

Outdoor air intake hood

mesh filter access

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.

Accessing the Energy Recovery Wheel in Models ERV-251, 361, 521 and 581

Internal Filter Maintenance

The ERV units will typically be provided with 2-inch,

Disconnect power to the ERV. Remove access panel(s) labeled “Energy Wheel Cassette Access”.

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®.

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.

Access to wheel through

outdoor air filter door

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.

Model ERV Energy Recovery Unit 27