Pulley Adjustment - Braemar Down Series Owners Manual Installation, Operating & Service Instructions

INSTALLATION

Pulley Adjustment

All RPC units are fitted with a variable
pitch pulley so that the full potential of
the motor can be utilised. The pulley is
set at the factory to approximate the
full motor load with the unit at free
delivery. When installed and operating
against system resistance, (with doors
and windows open fully) adjustment
may be made to the pulley in order that
all the available power is utilised.
Method of Pulley Adjustment
I m p o r t a n t ! N e v e r a t t e m p t t h i s
adjustment with the cooler operating.
Pulley adjustment is made with the
C o o l e r p o w e r i s o l a t e d a t t h e
Electronics Module.
1..... Remove the drive belt.
2..... To adjust the pulley; Remove the securing screw that holds the locking cap in
place. The adjustable half of the pulley is free to be adjusted by rotating it on its
thread. (fig 14)
3..... To increase the blower speed and therefore increase the motor amps, the two
halves of the pulley must be closer together, ie. turn the adjustable half clockwise
(pulley in).
4..... To decrease the blower speed and therefore decrease the motor amps, the
two halves of the pulley must be further apart, ie. turn the adjustable half of the
pulley anti-clockwise (pulley out).
5..... When an adjustment is made; Replace the locking cap, aligning the screw
hole with the nearest hole in the adjustable sheave. Lock it in place with the
securing screw. Refit the drive belt (ensure tension is correct, ie. no slipping and
not too tight, as this effects the motor current (fig 15) then check the amps
6...... Smaller adjustments should be made each time you approach the desired
setting. Refer heading Belt Tension
14
B
A
F
A = Fixed Sheave D = Adjustable Sheave
B = Motor E = Locking Cap
C = Grub Screw F = Locking Cap Fixing Screw
12
C
D
E