JOHNSON CONTROLS
52
FORM 100.50-NOM12
ISSUE DATE: 04/02/2019
SECTION 4 – MAINTENANCE
Recommended Lubricant for Fan Bearings
A Lithium / Petroleum base grease conforming to an
NLGI Grade II consistency is normally used. Lubri-
cant must be free of any chemical impurities such as
free acid or free alkali, dust, rust, metal particles or
abrasive. This light viscosity, low torque grease is rust
inhibited and water resistant, has a temperature range
of -30.0°F to +200.0°F with intermittent highs of
+250.0°F. Lubricate bearings as required by the sever-
ity of required duty.
Condenser Coils
Dirt should not be allowed to accumulate on the con-
denser coil surfaces. Cleaning should be as often as
necessary to keep coil clean.
If the coil needs to be cleaned, it should be washed
with water or with non-acidic Calgon Coilclean (mix
one part Coilclean with seven parts water). Allow the
Coilclean solution to remain on the coil for 30 min-
utes before rinsing with water. The solution should not
be allowed to come into contact with painted surfaces.
Do not use pressurized water greater than that found in
common garden hose/pressure nozzle equipment. Use
of a high pressure power washer to clean the coil will
damage the coil and could result in poor system perfor-
mance or system failure.
PERIODIC MAINTENANCE – THREE TO SIX
MONTHS
Disconnect and lock-out power from the
unit anytime service is being performed
on the fan section. Failure to do so could
result in serious injury or death due to the
fan turning ON while work is in progress.
Squealing belts during starting is caused
by slipping belts that are not tensioned
properly.
Motor Bearing Lubrication
Bearings must be re-lubricated periodically to assure
long life. Motor bearing should be lubricated yearly,
but may need lubrication more frequently, depending
on severe operating conditions.
Belt Tension
Adjust the belt tension if necessary. Required belt ten-
sion data is supplied on the fan “skid” data plate, at-
tached to the fan housing. Never use a belt dressing
on the belts. If belts slip with the proper tension, use a
good grade of belt cleanser to clean the belts. Refer to
.
Never use excessive belt tension, as this
could result in damaging the bearing,
motor pulleys or motor base. See drive
label on fan housing adjacent to drive for
specific details on tension.
When it is necessary to replace one belt in a given set,
the entire set of belts must be replaced.
PERIODIC MAINTENANCE – YEARLY
Check the fan wheels and inspect the drain pan for
sludge and foreign material. Clean if required.
Observe the operation of all dampers and make any
necessary adjustments in linkage and blade orientation
for proper operation.
Entire Unit Inspection
In addition to the checks listed in this section of the
manual, periodic overall inspections of the unit should
be accomplished to ensure proper equipment opera-
tion. Items such as loose hardware, component opera-
tion, refrigerant leaks, unusual noises, etc. should be
investigated and corrected immediately.
Sheave Alignment
To check sheave alignment, a straight edge or a piece of
string can be used. If the sheaves are properly aligned,
the string or straight edge will touch at all points, as
indicated in
. Rotating the
sheaves will determine if the sheave is wobbly or the
drive shaft is bent. Alignment error must be corrected
to avoid bearing and belt failure.
FIGURE 17 -
SHEAVE ALIGNMENT
LD07634
Cord Touching Sheaves At
Points Indicated By Arrows
Cord Tied
To Shaft
