Belt Tension - Breezaire EXV Series Installation And Operating Manual

INLET DRAIN
Entrada Valvula
de drenaje
RECEIVER del agua
Receptor
PUMP
Bomba
NOTE: SPLASH COVER NOT SHOWN FOR CLARITY.
Nota: Para mayor claridadno se muestra la tapa protectora.
CONNECTOR
Orientación del
ORIENTATION
conectador
(vista lateral)
(side view)
MOTOR POWER (AMPS)
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's 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. (Fig. 23)
This should be done by a trained
licensed electrician.
23
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
22
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.
WATER PROBE
The measured amps must be equal
Sonda del agua
or close to, but never more than the
MINIMUM SPEED
ADJUST
nameplate amps. (see heading
Ajuste de la velocidad
"Pulley (Sheave) Adjustment")
DIAGNOSTIC
LED'S
If the measured amps are greater than
LED's de diagnóstico
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
ILL1392-A
protector to trip.
Replace all covers when adjustments
are completed using the screws
provided
PULLEY (SHEAVE)
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. (Fig. 24)
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. (Fig. 24)
24
A = Fixed Sheave
B = Grub Screw
C = Adjustable Sheave
D = Locking Cap
E = Locking Cap Screw
Installation Details
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.

BELT TENSION

Belt tension is important. If it is too
tight there will be excessive belt and
bearing wear. If it is too loose there will
be belt slip, excessive belt wear and
loss of cooler performance.
There are two adjuster bolts with
locking nuts attached to the motor
mounting.
The tension should be adjusted so that
the deflection on one side of the belt is
5/8" to 13/16". To make the
adjustment, loosen the locking nuts
and screw the bolts in or out as
required to change the belt tension.
Re-tighten the locking nuts.
It is important to recheck the motor
amps again after re-setting the belt
tension.
Correct belt tension ensures the belt
will not slip. Check the temperature of
the belt by hand after each adjustment,
by turning off the cooler and holding
one side of the belt in your hand. If the
belt is warm to touch, it is slipping!
Continue to tighten until it runs cool.
(Fig. 25)
25
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