10
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A = Fixed Sheave
B = Grub Screw
C = Adjustable Sheave
D = Locking Cap
E = Locking Cap Screw
ILL1208-D
The outer half of the pulley is on a thread and can be moved in
or out by removing the locking cap and then turning the outer
half by hand in the desired direction.
When an adjustment is made, replace the locking cap, aligning
the screw hole with the nearest hole in the adjustable half. Lock
it into place with the securing screw. Refit the belt, reset the belt
tension, then run the cooler and check the amps. Repeat the
process until the amp level is set.
You can start and stop the cooler for this procedure by using the
isolating switch inside the cooler.
INSTALLATION
PULLEY ADJUSTMENT
The motor pulley is adjustable in order to set the motor amperes
at the correct (nameplate) level, and thus provide the owner
with full machine cooling capacity.
DO NOT USE THE PULLEY ADJUSTMENT TO SET BELT
TENSION
The adjustment is made with the cooler switched OFF. Never
attempt this procedure with the cooler operating.
•
Remove the drive belt.
• To increase the fan speed (and therefore the motor amps),
the two halves of the pulley must be closer together, ie: turn
the adjustable half clockwise.
• To decrease the fan speed (and therefore the motor amps),
the two halves of the pulley must be further apart, ie: turn the
adjustable half counter-clockwise.
Important:
Install all the pad frames except the one on the
motor side.
Ensure that all intended doors, windows or other means of
exhaust are open in the building, and that all outlet grilles are
open fully.
WARNING:
Beware of rotating fan, belt and pulleys whilst
making adjustments to motor speed, pulley or belt tension
settings. Ensure the cooler is switched OFF via the electronic
module isolation switch whilst working inside the cooler.
Set the cooler running at the highest speed for about 10
minutes, or until the motor has reached its normal operating
temperature (hot!).Motor load must be checked without the
pump running.
Clip your ammeter onto the free cable in the main termination
box. This should be done by a trained licensed electrician.
MOTOR POWER (AMPS)
ILL1013-D
For convenience, the rated motor current, in amps, is printed
on a small label attached near the cable fork (in addition to the
normal motor nameplate label located at the back of the motor).
Check the measured amps against the motor nameplate amps.
If the measured amps are less than the nameplate amps the
adjustable motor pulley sheave must be altered to increase the
fan speed, thereby delivering the full capability of the cooler to
your installation. The measured amps must be equal or close
to, but never more than the nameplate amps. (see heading
“Pulley Adjustment”)
If the measured amps are greater than the motor nameplate
amps the fan
MUST
be slowed down by adjusting the motor
pulley sheave in the opposite manner. Failure to do this will
cause overheating in the motor and may cause the motor’s
thermal protector to trip.
Replace all covers when adjustments are completed using the
screws provided.
