ROUTINE ENERGY RECOVERY WHEEL MAINTENANCE
CAUTION: See **WARNING** on Page 1 and 11
MAINTENANCE OF THE ENERGY RECOVERY WHEEL
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 ENERGY RECOVERY WHEEL
For the ERH-20 and ERH-45, open the access door marked "Energy Wheel Cassette Access" (FIGURE 20). UNPLUG the wheel drive motor and remove the metal spacer. Then pull the cassette out halfway (FIGURE 21).
The energy recovery wheel cassettes for model ERH-55 and ERH-90 do not slide out due to their size and weight. Service to these energy wheel cassettes can be done through the Filter and Electrical Control Box access doors, or by entering the unit through the Exhaust Blower access door.
**WARNING: Disconnect power to the unit before performing any type of service.**