40
PERIODIC MAINTENANCE – THREE TO SIX MONTHS
Disconnect and lock-out power from
the unit anytime service is being per-
formed 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
tension data is listed in Table 13 below
. Never use
belt dressing on the belts. If belts slip with the proper
tension, use a good grade belt cleanser to clean the
belts.
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 wheel and inspect the drain pans for
sludge and foreign material. Clean if required.
If unit has an air side economizer, 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, periodic
overall inspections of the unit should be accomplished
to ensure proper equipment operation. Items such as
loose hardware, component operation, 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 Fig. 3.
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.
TABLE 13 – BELT TENSION DATA
BELT CROSS
SECTION
SMALLEST SHEAVE
DIAMETER RANGE
RPM RANGE
BELT DEFECTION FORCE
SUPER GRIPBELTS AND UN-
NOTCHED GRIPBANDS
GRIPNOTCH BELTS AND NOTCHED
GRIPBANDS
USED BELTS
NEW BELTS
USED BELTS
NEW BELTS
5V, 5VX
4.4 – 6.7
550 – 1749
1750 – 3000
3001 – 4000
-
-
-
-
-
-
10.2
8.8
5.6
15.2
13,2
8.5
7.1 – 10.9
500 – 1740
1741 – 3000
12.7
11.2
18.9
16.7
14.8
13.7
22.1
20.1
11.8 – 16.0
500 – 1740
1741 – 3000
15.5
14.6
23.4
21.8
17.1
16.8
25.5
25.0
SHEAVE DIAMETER – INCHES; DEFLECTION FORCE – LBS
FIG. 3 – SHEAVE ALIGNMENT
LD07634
CORD TOUCHING SHEAVES AT
POINTS INDICATED BY ARROWS
CORD TIED
TO SHAFT
Maintenance
JOHNSON CONTROLS
FORM 145.05-NOM1 (708)
Summary of Contents for York VERSECON YSWD 012
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