FloAire FAV-M - Manual (Page 19)

19
Turn the blower service switch ON. The
(optional) intake or discharge damper
motor will start to open. Once the damper
is 70% open the damper motor internal end
switch will close and energize the blower
motor starter.
Check that the motor amp draw is less than
the FLA (full load amps) of the blower
motor.
The fan RPM may need to be reduced
to decrease motor amps.
Opening the driver pulley decreases
RPM and motor amps.
Closing the driver pulley increases
RPM and motor amps.
Record the motor amps on the Start-
Up Sheet.
If the RPM was adjusted in the field use a
tachometer to record the new RPM on the
Start-Up Sheet.
Check the belt tension after any RPM
adjustments. See the belt tension detail.
Check the air flow pressure drop in 100% fresh air and re-circulating mode. Use the re-circulating
damper motor control to switch the unit between modes.
The damper is controlled by one of the following control options;
Manual Switch – Potentiometer - Photohelic
This will ensure proper pressure drop across the burner profile.
The air flow switch on the re-circulating units is a low and high air flow switch and opens below
0.15 in w.c and above 0.95 in w.c.
The target pressure drop range for the re-circulating unit is 0.40 – 0.60 in w.c. Both 100% fresh air
and re-circulating mode should be within this range.
Use the profile plates or blower RPM to increase or decrease the pressure drop.
Record the pressure drops on the Start-Up Sheet.
If the pressure drop is too low, in
fresh and return air mode, add
more blank-off panels to the
burner profile opening and bypass
fresh air and return air damper,
which will increase the pressure
drop. (There must be at least 2
inches of area minimum around
the burner.) If the correct air flow
pressure drop is still not achieved
adjust the blower drives to
increase the blowers RPM.
If the pressure drop is too high, in
fresh and return air mode, remove
or adjust the bypass fresh air and
return air damper blank-off panels,
which will decrease the pressure
drop. If the correct air flow
pressure drop is still not achieved
adjust the blower drives to
decrease the blowers RPM.
If the pressure drop is too high, in
fresh mode only, remove or adjust
the bypass damper blank-off
panels, which will decrease the
pressure drop. The return air
damper opening may need to be
adjusted to maintain the correct air
flow pressure drop when switching
back to return air mode.
If the pressure drop is too high, in
fresh and return air mode, remove
or adjust the bypass fresh air and
return air damper blank-off panels,
which will decrease the pressure
drop. If the correct air flow
pressure drop is still not achieved
adjust the blower drives to
decrease the blowers RPM.
BLOWER
SERVICE
SWITCH