TM 5-3895-374-24-1
GP467FB
9.
Set the internal FUEL SELECTOR switch to the desired fuel position
10. Adjust the remaining limit switches to the values required by your application. Consult the Manufacturer’s literature for
the proper method of switch adjustment.
11. Final adjustment of the low and high pressure switches should be made at the time of Initial startup. To adjust the
LOW air pressure switch, reduce the air pressure at the burner until the burner goes out or Improper combustion takes
place * The pressure should then be increased by whatever amount is necessary to maintain ignition or the desirable
condition.* The LOW fuel pressure switches should also be adjusted to break at a pressure just below that required to
maintain burner ignition at the desirable condition.* The HIGH fuel pressure switches should be adjusted to break at a
pressure just above that obtained at the burner during correct high fire operation. Refer to vendor literature for correct
method of switch adjustment.
*IMPORTANT
Fuel flows should not exceed the amount of available air for combustion In normal operation in order to
prevent formation of carbon monoxide and/or unburned fuel. The fuel flows should be limited by setting
the high fuel pressure switches to prevent incomplete combustion in normal circumstances If atmosphere
is of a reducing type (i.e. , CO or unburned fuel present), additional safety precautions will dictate the
proper setting of the high pressure switches.
E. FINAL CHECKOUT
1.
Be sure that all equipment and components have been installed in accordance with the manufacturer’s Instructions
and drawings.
2.
Verify that all necessary preliminary adjustments have been made.
3.
Be sure all switches and valves are properly installed and correctly wired
4.
Be sure all traps and filters in the system which may have accumulated dirt or other foreign material
5.
Make a final check of all fuel and air supply lines for leaks caused by loose fittings, unions, valves, etc.
F. PANEL OPERATION
1.
With the panel power OFF, open the hinged door and verify that the FUEL SELECTOR switch is In the desired
position.
2.
Open all manual shutoff valves to supply air and fuel to the system.
3.
Place the panel POWER switch in the ON position, the following events will occur.
a. The alarm horn will sound. Press the ALARM SILENCE pushbutton.
b. The burner control motor will drive to Its low fire position.
c. The Tertiary Air Damper, If applicable, will drive OPEN for purge.
(page 3-14)
