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Maintenance
JOHNSON CONTROLS
FORM 100.50-NOM6 (1207)
Condenser Coils
Dirt should not be al lowed to accumulate on the
con dens er coil surfaces. Cleaning should be as often
as nec es sary to keep coil clean.
PERIODIC MAINTENANCE – THREE TO SIX MONTHS
Disconnect and lock-out power from
the unit anytime service is being per-
formed on the fan sec tion. Failure to
do so could re sult in serious in ju ry or
death due to the fan turning on while
work is in progress.
Squealing belts during starting is
caused by slip ping belts that are not
tensioned prop er ly.
Motor Bearing Lubrication
Bearings must be re-lubricated periodically to assure
long life. Motor bearing should be lubricated yearly,
but may need lu bri ca tion more fre quent ly, depending
on se vere operating conditions.
Belt Tension
Adjust the belt tension if necessary. Re quired belt
ten sion data is supplied on the fan “skid” data plate,
at tached to the fan housing. Never use a belt dress ing
on the belts. If belts slip with the prop er ten sion, use a
good grade of belt cleans er to clean the belts. Refer to
Figures 4-1.
Never use excessive belt tension,
as this could re sult in damaging
the bear ing, motor pul leys or mo tor
base. See drive label on fan housing
adjacent to drive for spe cifi c de tails
on ten sion.
When it is necessary to replace one belt in a given set,
the entire set of belts must be replaced.
Entire Unit Inspection
In addition to the checks listed in this sec tion, pe ri od ic
over all inspections of the unit should be ac com plished
to en sure proper equipment operation. Items such as
loose hardware, component operation, refrigerant leaks,
un usu al noises, etc. should be investigated and cor rect ed
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
in di cat ed in Figure. 4-1. Rotating the sheaves will
de ter mine if the sheave is wobbly or the drive shaft is
bent. Align ment error must be corrected to avoid bear ing
and belt failure.
Belts
New belts should be re-checked after 24 hours of
operation. On multiple belt adjustable pul leys, the pitch
depth should be checked to insure iden ti cal belt trav el,
power transfer and wear. Adjustable motor bases are
pro vid ed for belt adjustment.
Motor pulleys and blower shaft pulleys are locked
in po si tion with ei ther set screws or split taper lock
bush ings. All set screws and/or taper lock bolts must
be checked for tightness and align ment be fore put ting
equip ment into op er a tion.
FIG. 4-1 – SHEAVE ALIGNMENT
LD07634
CORD TOUCHING SHEAVES AT
POINTS INDICATED BY AR ROWS
CORD TIED
TO SHAFT
PERIODIC MAINTENANCE – YEARLY
Check the fan wheels and in spect the drain pan for
sludge and foreign material. Clean if re quired.
Observe the operation of all dampers and make any
necessary ad just ments in linkage and blade ori en ta tion
for proper operation.