FloAire FAV - Manual (Page 20)

20
Setting Low Fire
Disconnect power to the amplifier or modulating
valve
Adjust the low fire setting on the modulation valve so
the flame is full length of burner without dark spots
See the details for the low fire pressure adjustment
locations
Use the burner observation port on the end of the
unit to view the flame size
Replace all amplifier wires in the place they were
removed to set high and low fire
Additional capacity is provided via a low fire bypass
when MR212 low fire capacity is insufficient. Additional
adjustment is made via the R400S regulator installed in
the low fire bypass.
Final Start-Up
Set the Burner Intake On-Off Thermostat to the desired temperature to disable burner
This will automatically open the burner circuit when the outside air is above the selected
temperature
Turn the blower and burner service switches OFF
Now the unit will be operated from the control panel only
Operate the unit from the remote panel checking the lights, switches, set-points, and optional
thermostats or timers
Review the proper operation and sequence of operation with the customer to ensure that the unit is
operated properly and that the customer does not misuse the equipment
Complete the Start-Up Sheet and fax it to the service department to validate the warranty
START-UP PROCEDURE VARIABLE AIR VOLUME
The Start-Up procedure for variable air volume units is the same as the single speed unit except there are
additional steps for checking burner pressure drop and setting high/low fire. Use the single speed
procedure along with these additional steps for the vav start-up procedure.
Check the air flow pressure drop through entire airflow range.
The air flow switch on vav units is a low (0.15) and (0.65) high switch
Do not adjust airflow switches
Use the profile plates, choke-off dampers or VFD to increase or decrease the pressure drop.
Record the pressure drops on the Start-Up Sheet.
Verify the flame limiting device is functioning properly in low speed on units with a vfd.
Verify low fire setting at minimum flow rate as well.
LOW FIRE
M511 & M611
LOW FIRE
MR212