ACCESS COMBUSTION, LLC
WARNING:
Only authorized burner service personnel should start, adjust, or service this equipment!
Rev. 05
Page 13 of 19
A
DJUSTMENT OF
A
IR
F
LOW
S
WITCH
Air flow switch is used to prove the flow of combustion air from the blower assembly. It causes a lockout and burner
shutdown upon loss of or inadequate combustion air.
Switch should be set to open when combustion air is below minimum fire set point.
Switch should only energize and close when air flow is present.
A
DJUSTMENT OF
F
ILTER
S
WITCHES
Filter Switches are optional equipment.
For burner equipped with air inlet filter, the burner is supplied with additional air flow switches. The additional
switches are used to prove the performance of the filter and ensure proper flow of combustion air. Depending on
the option selected up to two switches may be provided;
Optional Filter Switch one causes lockout if filters are not providing sufficient air for high fire combustion.
Optional Second Filter Switch, triggers a dirty filter warning.
Filter switches should be adjusted at high fire by temporarily restricting filter inlet. Warning switch should be set to
open when high fire O2 level drops 1% from the normal operating condition. Lockout switch should be set to open
when high fire O2 level drops 2% from the normal operating condition.
A
DJUSTMENT OF
G
AS
P
RESSURE
R
EGULATORS
Gas burners have two gas pressure regulators, one to regulate and limit the pilot gas pressure and one to regulate
and limit the main gas pressure.
Refer to Pilot Commissioning for instruction on Pilot Regulator settings.
Main gas pressure regulator should be set together with main gas control valve. At high fire, main gas control valve
should be set to fully open position and the regulator set screw should be adjusted to provide sufficient gas flow at
high fire setting.
Turn adjusting screw clockwise to increase pressure or counterclockwise to decrease pressure.
