SERVICING
39
DRIVE BELT TENSION ADJUSTMENT
3 - 6 TON MODELS
BELT DRIVE USED NEW
AX Standard 3.0 to 4.0 4.5 +/- 0.5 5.0 +/- 0.5 5/16 +/- 1/16
DEFLECTION FORCE
(lbs)
TYPE DEFLECTION
(in)
SMALL
SHEAVE
DIAMETER
(in)
RECOMMENDED POUNDS OF FORCE PER BELT
S-206 INDOOR FAN ROTATION CHECK
Evaporator Fan Rotation Check (Three Phase Models
Only)
Check that fan rotates counter-clockwise when viewed from
the drive side of unit and in accordance with rotation arrow
shown on blower housing. If it does not, reverse any two
incoming power cables at Single Point Power Block. In this
case, repeat bearing check.
Do not attempt to change load side wiring. Internal wiring
assures all motors and compressors will rotate in correct
direction once evaporator fan motor rotation check has been
made.
S-207 MOTOR SHEAVE ADJUSTMENT
V
L, VM, & 2VP VARIABLE PITCH KEY TYPE MOTOR
SHEAVES
The driving and driven motor sheaves should be in alignment
with each other and the shafts parallel.
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: Do NOT operate sheave with flange projecting
beyond the hub end.
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