Carrier specifications Replacing a Blower 62EB and 62E7 Units, Maintenance, A62-285ef

Locking	Belt (Shown in
	Place)
Collar

Bearing

Access Plate

Retaining

Screws

Set Screw

Drift Hole

Locating Pin

Belt

Locking	Bearing	Wheel Rim
	Support
Nut (2)	Beam	Wheel
Bearing
Housing		Hub (2)
		Taper - Lock
		Hub Collar (2)
		Shaft
	PULL
FEED		A62-285ef
	Pulley	Motor
	Side	Side

Fig. 38 — Belt Replacement (Diameter Seals Removed)

Replacing a Blower (62EB and 62E7 Units)

EXHAUST OR SUPPLY SIDE — Turn off the power to the unit. Remove all of the screws from the top panel. Pry the top panel up from its gasket seat, being careful not to bend the lid. Disconnect plug from the blower. Remove all of the P-clips, wire ties and hoses that will keep the blower assembly from lifting out. Remove all of the screws holding the blower in the ERV unit and remove the blower. Follow these instructions in reverse order to install the new blower.

MAINTENANCE

Routine maintenance of the energy recovery cassettes includes periodic cleaning of the energy recovery wheel as well as inspection of the air seals and wheel drive components as follows:

Cleaning — The need for periodic cleaning of the energy recovery wheel will be a function of operating schedule, cli- mate and contaminants in the indoor air being exhausted, and the outdoor air being supplied to the building.

The air exchange wheel is “self-cleaning” with respect to dry particles due to its laminar flow characteristics. Smaller particles pass through; larger particles land on the surface and are blown clear as the flow direction is reversed. Any material that builds up on the face of the wheel can be removed with a brush or vacuum. The primary need for cleaning is to remove oil-based aerosols that have condensed on energy transfer surfaces.

A characteristic of all dry desiccants, such films can close off micron sized pores at the surface of the desiccant material, reducing the efficiency by which the desiccant can adsorb and desorb moisture and also build up so as to reduce airflow.

In a reasonably clean indoor environment such as a school or office building, measurable reductions of airflow or loss of sensible effectiveness may not occur for several years.

Measurable changes in latent energy transfer can occur in shorter periods of time in applications such as moderate occu- pant smoking or cooking facilities. In applications experienc- ing unusually high levels of occupant smoking or oil-based aerosols such as industrial applications involving the ventila- tion of machine shop areas for example, annual washing of en- ergy transfer may be necessary to maintain latent transfer effi- ciency. Proper cleaning of the energy recovery wheel will re- store latent effectiveness to near original performance.

To clean, gain access to the energy recovery wheel and remove wheel. Brush foreign material from the face of the wheel. Wash the wheel in a 5% solution of non-acid based coil cleaner or alkaline detergent and warm water.

Soak in the solution until grease and tar deposits are loosened.

NOTE: Some staining of the desiccant may remain and is not harmful to performance.

Before removing, rapidly run finger across surface of wheel to separate polymer strips for better cleaning action. Rinse dirty solution from wheel and remove excess water before reinstalling.

CAUTION

Do not use acid based cleaners, aromatic solvents, steam or temperatures in excess of 76.7 C (170 F); damage to the wheel may result.

Air Seals — Diameter seals are provided on each cassette to minimize transfer of air between the counter flowing airstreams.

To adjust diameter seals, loosen diameter seal adjusting screws and back seals away from wheel surface See Fig. 39. Rotate wheel clockwise until 2 opposing spokes are hidden behind the bearing support beam. Using a folded piece of paper

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