Motor Low Speed Setting ( Variable Speed Only) - Braemar Down Series Owners Manual Installation, Operating & Service Instructions

14
INSTALLATION
Motor Low Speed Setting (Variable Speed Only
RPC coolers fitted with the Electronics
16
Module and Variable Speed Wall Control,
will function across a wide speed range.
The minimum speed has been factory set,
and should not require any adjustment
under normal circumstances. However,
some adjustment may be necessary to
suit specific installations.
After you have set the motor current and
belt tension correctly, check the speed
variation of the cooler. When the control is
changed from maximum to minimum
s e t t i n g s , t h e r e s h o u l d b e a n e a s i l y
recognizable difference in fan speed.
If not, check the following;
1.... That windows and doors are open.
Rule of thumb is to have 2 times the area
of the outlet grille open for exhaust in
each room.
2..... The weather damper is able to move freely (where fitted).
If the above are all correct then proceed as follows.
3..... Set the fan speed to minimum using the wall control, so that only one bar is
displayed.
5..... Turn the minimum speed adjustment knob clockwise or anti-clockwise, until
the belt is running at approximately one revolution per second (this equates to a fan
speed of approximately 600 rpm). The fan will give a burst on start up to open the
weather damper (where fitted). Switch the fan off then on again, to ensure that the
fan spins fast enough to open the weather damper and keep it open. It is important
to allow the cooler to run for a while on minimum speed, to ensure the weather
damper remains in the fully open position.