Form O-Y, PN 273647R5, Page 28
4.2 Energy
Recovery
Wheel,
Option EW
Check Wheel RPM
- The wheel should rotate slowly at approximately 53 rpm. If rota-
tion is not normal, see the wheel maintenance information that follows. Perform ser-
vice as needed and/or replace any defective parts.
Wheel Maintenance
- How often the wheel needs to be cleaned depends on its
environment. Because the wheel rotates between two opposing airstreams, it is self-
cleaning of most dry dirt and dust and will remain efficient for a long period of time.
However, when the wheel is exposed to oils, tars, or greases in either the supply or
exhaust airstream, the surface will become “sticky” and will hold the dirt and dust.
Over time the air passages will become blocked causing loss of recovery, excessive
pressure drop, and loss of energy savings.
According to the manufacturer, a wheel operating in a “clean” environment may not
require annual cleaning, but a wheel in a “contaminated” environment may require
multiple cleanings a year to maintain airflow and recovery. The segmented design
of the wheel not only provides for easier cleaning but also allows for replacement of
individual dirty segments. (See replacement P/N’s on page 30).
The energy recovery wheel including power exhaust is an integral part of the system.
Energy Recovery Wheel
Optional
Preheat
Elements
Exhaust Damper
Outside
Air
Sensor
Power
Exhaust
FIGURE 20 - Energy
Recovery Wheel
Removing, Cleaning, and Replacing Wheel Segments -
The segments are the
“heat exchangers” of the energy recovery wheel. Segments must be handled with
care and should never be dropped. Segments may require “slight” persuasion during
installation and removal but NEVER be forced or banged with a hammer or similar
tool.
Instructions:
□
Turn off power to the unit and lock the disconnect switch open.
□
Slide the wheel cassette out of the cabinet (refer to illustration, page 4) NOTE:
Some models may require the removing of a sheet metal blockoff in order to
access the energy recovery wheel.
Remove the wheel segments (from the pulley side of the wheel)
□
Rotate the wheel to position the first segment to be removed at the top. On both
sides of the segment, unlock and open the two retaining straps.
□
Using hand pressure only and supporting the segment, from the motor side
push the wheel segment. On the pulley side, lift the segment out of the spokes.
Lay, do not drop, the segment on a flat surface
□
Rotate the wheel so that the segment on the opposite side is on the top. Repeat
the procedure and remove the segment. Continue the procedure of keeping the
balanced open and filled segments opposite each other and remove all of the
segments.
4.0 Maintenance/Service Procedures - Power Exhaust & Energy Recovery (cont'd)
