COOK ERV - Manual (Page 11)

11
Lubrication - Motor Bearings
Motors are provided with prelubricated bearings. Any
lubrication instructions shown on the motor nameplate
supersede instructions below.
Motor bearings without provisions for relubrication will
operate up to 10 years under normal conditions with no
maintenance. In severe applications, high temperatures or
excessive contaminates, it is advisable to have the mainte-
nance department disassemble and lubricate the bearings
after 3 years of operation to prevent interruption of service.
For motors with provisions for relubrication, follow inter-
vals of the table below.
Motors are provided with a polyurea mineral oil NGLI #2
grease. All additions to the motor bearings are to be with a
compatable grease such as Exxon Mobil Polyrex EM and
Chevron SRI.
The above intervals should be reduced to half for vertical
shaft installations.
Motor Services
Should the motor prove defective within a one-year
period, contact your local Loren Cook representative or
your nearest authorized electric motor service representa-
tive.
Replacing Fan Pulleys and Belts
a. Remove pulleys from their respective shafts.
b. Clean the motor and fan shafts.
c. Clean bores of pulleys and coat the bores with heavy
oil.
d. Remove grease, rust, or burrs from the pulleys and
shafts.
e. Remove burrs from shaft by sanding.
f. Place fan pulley on fan shaft and motor pulley on its
shaft. Damage to the pulleys can occur when exces-
sive force is used in placing the pulleys on their
respective shafts.
g. Tighten in place.
h. Install belts on pulleys and align as described in the
Belt and Pulley Installation section.
Fan Bearing Replacement
The fan bearings for the ERV - 10000 are pillow block
ball bearings. Bearings should be replaced individually
from each side of fan.
An emery cloth or file may be needed to remove imper-
fections in the shaft left by the setscrews.
a. Remove blower access door.
b. Loosen motor plate adjustment bolts, then move the
motor plate so the belt will easily slip off. Remove
driven pulley by loosening the setscrews.
Relubrication Intervals
Service
Conditions
NEMA Frame Size
Up to and
including 184T
213T-365T 404T and larger
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
Standard 3 yrs. 6 months 2 yrs. 6 months 1 yr. 3 months
Severe 1 yr. 3 months 1 yr. 3 months 6 months 1 months
c. Remove the bearings from shaft.
d. Slide new bearings onto shaft to desired location and
mount bearings loosely onto support base. Bearing
bolts and setscrews should be loose to allow shaft
positioning.
e. Position the wheel properly and tighten the bearing
bolts securely to the support base.
f. Align setscrews bearing to bearing and tighten against
the shaft securely.
Never tighten both pairs of setscrews before secur-
ing bearing mounting bolts. This may damage the
shaft.
g. Check wheel position again. If necessary, readjust by
loosening the bearing bolts and setscrew and repeat
step e.
Energy Recovery Wheel Maintenance
Energy Recovery Wheel Bearings
All ERVs (except ERV-10000) are provided with no
maintenance inboard bearings. These bearings should
require no maintenance during the life of the equipment.
ERV-10000 comes equipped with an external flanged bear-
ing which should be greased annually. Use a petroleum
based lubricant.
Energy Recovery Wheel Cleaning
The wheel is designed to last the life of the equipment. It
is important to routinely change the filters to keep dust
and dirt from the heat transfer wheel surface. The
wheel is somewhat self cleaning through its normal
action of rotating in and out of countercurrent air flow
streams. If the wheel becomes dirty, it may be cleaned
by blowing out the unit with compressed air (20 psig
maximum). In cases of severe uncleanliness, the
wheel cassette can be washed with water following
removal of the wheel cassette drive motor. It is also
permissible to steam clean the wheel.
1. Remove wheel access door and slide out cassette.
2. Remove wheel drive motor.
3. Wash the media carefully with water, once clean, allow
the media to dry out for several hours or days if neces-
sary.
4. Reinstall using the reverse procedure. Run the unit. It
may take several hours for the desiccant to dry out and
for the wheel to perform normally.
NOTE: A damp wheel must be dried out as soon as pos-
sible. Mold and mildew can and will form on the wet
wheel media. Failure to dry wheel media completely
can ruin the wheel and will void the wheel warranty.
Use of a wheel that has a mold/mildew condition can
result in occupant complaints and sickness.
Energy Wheel Drive Belt
Proper energy wheel operation depends on the tightnes
of the wheel drive belt. For proper tension, a deflection of
approximately 1/4” per foot of belt distance from where belt
contacts energy wheel to the sheave.