JOHNSON CONTROLS
72
FORM 102.20-OM2
ISSUE DATE: 6/01/2015
SECTION 3 - MAINTENANCE
FIGURE 74 -
INSTALLATION
LD17102
With drive ratios around 1:1, it may be
necessary to add back one link to allow
belts to be rolled on. This does not apply if
using the Alternative Installation Method.
Alternative Installation Method
1. Set motor to mid-position of adjustment range and
mark base clearly.
2. Determine required belt length as in I.
3. Push motor forward to minimum centre distance.
4. Install belts as in IV.
5. Pull motor back to previously marked mid-posi-
tion.
Retensioning
Like all high performance V-belts, PowerTwist Plus V-
Belts require the maintenance of correct drive tension
to operate efficiently. Experience indicates that drive
tension should be checked after 24 hours running at
full load. A retension may be necessary depending on
the severity of the drive. Any initial belt stretch is then
taken up. Subsequently, belt tension should be checked
periodically and adjusted when necessary.
THERMOTECH
®
Periodic cleaning of the energy recovery wheel will
be a function of the operating schedule, climate, and
contaminates in the indoor air being exhausted and out-
door air being supplied to the building.
Cleaning the Wheel
The wheel media does not require any cleaning under
normal operating conditions and proper maintenance
of the drive systems and main bearings. The key is to
make sure the wheel is always turning in order to uti-
lize the counter flow airstreams and the purge sector
to keep the media clean. Over the years there might be
some accumulation of dirt on the face of the media, but
the inside will remain clean.
The best method to clean the wheel is to brush the sur-
face on the air discharge side with the airflow on, or by
using a vacuum cleaner. A 2,300 psi pressure washer
can be used in situations where the media is severely
clogged. Care should be taken to not damage the media
face by the full force of the spray. It is recommended
that the pressure cleaning method is tested on a small
Area Of The Media.
Adjusting Air Seals
The seals are set at the factory and should not require
adjustment. If the seals are rubbing on the media face,
due to incorrect installation and other factors, adjust
the seals.
1. Rotate the wheel one full revolution, and deter-
mine where the wheel media face is rubbing on
the seal.
2. Working on one seal quadrant at a time, loosen the
seal Tek screws as shown in
3. Move the seal away form the wheel surface until
no more rubbing is noticed.
A typical large diameter wheel will have a flatness
variation of 1/ 16 in. from the high to low point of the
wheel surface. If the seals are adjusted correctly, the
seal gap will vary that much as the wheel turns, but the
seal should never touch the wheel surface.
FIGURE 75 -
LOOSEN SCREWS BEFORE ADJUST-
ING SEALS
LD16608
