Filter
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22
VL & VM SHEAVES ADJUSTMENT
1. Loosen set screw “B” using a 5/32" Allen key.
2. Making half or full turns from closed position, adjust
sheave pitch diameter for desired speed. DO NOT
OPEN MORE THAN FIVE FULL TURNS.
3. Tighten set screw “B” securely over flat.
4. Carefully put on belts and adjust belt tension. DO NOT
FORCE BELTS OVER GROOVES.
5. Ensure all keys are in place and the set screws tight
before starting drive. Recheck set screws and belt
tension after 24 hours service.
NOTE: Future adjustments should be made by loosening the
belt tension and increasing or decreasing the pitch diameter
of the sheave by half or full turns as required. Readjust belt
tension before starting drive.
C
B
VL & VM
NOTE: For horizontal discharge, remove the supply and return
duct covers and place them over the vertical discharge return
and supply openings (bottom of unit).
NOTE: Do not operate sheave with flange projecting beyond
the hub end.
MAINTENANCE
HIGHVOL TAGE!
D
ISCONNECT
ALL
POWER
BEFORE
SERVICING
OR
INSTALLING
THIS
UNIT
.M
ULTIPLE
POWER
SOURCES
MAY
BE
PRESENT
.F
AILURE
TO
DO
SO
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
WARNING
T
O
PREVEN T
PERSONAL
INJURY
OR
DEATH
DUE
TO
IMPROPER
INSTALLATION
,
ADJUSTMENT
,
ALTERATION
,
SERVICE
OR
MAINTENANCE
,
REFER
TO
THIS
MANUAL
.F
OR
ADDITIONAL
ASSISTANCE
OR
INFOR MATIO N
,
CONSULT
A
QUALIFIED
INSTALLER
,
SERVICE
AGENCY
OR
THE
GAS
SUPPLIER
.
WARNING
S
HEET
METAL
PARTS
,
SCREWS
,
CLIPS
AND
SIMILAR
ITEMS
INHERENTLY
HAVE
SHARP
EDGES
,
AND
IT
IS
NECESSARY
THAT
THE
INSTALLER
AND
SERVICE
PERSONNEL
EXERCISE
CAUTION
.
CAUTION
Preventive maintenance is the best way to avoid unneces-
sary expense and inconvenience. Have this system inspected
at regular intervals by qualified service personnel, at least
twice a year. Routine maintenance should cover the follow-
ing items:
1. Tighten all belts, set screws, and wire connections.
2. Clean evaporator and condenser coils mechanically
or with cold water, if necessary. Usually any fouling is
only matted on the entering air face of the coil and
can be removed by brushing.
3. Lubricate motor bearings.
4. Align or replace belts as needed.
5. Replace filters as needed (see below).
6. Check for blockage of condensate drain.
7. Check power and control voltages.
8. Check running amperage.
9. Check operating temperatures and pressures.
10. Check and adjust temperature and pressure controls.
11. Check and adjust damper linkages.
12. Check operation of all safety controls.
13. Examine gas furnaces (see below and the User’s
Information Manual).
14. Check condenser fans and tighten set screws.
FILTERS
T
O
PREVENT
PROPERTY
DAMAGE
DUE
TO
FIRE
AND
LOSS
OF
EQUIPMENT
EFFICIENCY
OR
EQUIPMENT
DAMAGE
DUE
TO
DUST
AND
LINT
BUILD
UP
ON
INTERNAL
PARTS
,
NEVER
OPERATE
UNIT
WITHOUT
AN
AIR
FILTER
INSTALLED
IN
THE
RETURN
AIR
SYSTEM
.
CAUTION
Every application may require a different frequency of replace-
ment of dirty filters. Filters must be replaced at least every
three (3) months during operating seasons.
Dirty filters are the most common cause of inadequate heat-
ing or cooling performance. Filter inspection should be made
at least every two months; more often if necessary because
of local conditions and usage.
Dirty throwaway filters should be discarded and replaced with
a new, clean filter.
Disposable return air filters are supplied with this unit. See
the unit Specification Sheet or Technical Manual for the cor-
rect size and part number. To remove the filters, remove the
filter access panel on return side of the unit.
CABINET FINISH MAINTENANCE
Use a fine grade automotive wax on the cabinet finish to
maintain the finish’s original high luster. This is especially
important in installations with extended periods of direct sun-
light.