Specifications

Northfire 3400 26
SERVICING Cont...
 Open the lower grills.
 The pressure test taps are located on the valve.
Automatic valve: The taps are located in the front. The inlet is marked ‘IN’ and the outlet is
marked ‘OUT’. There is also an arrow marking the direction of gas flow.
Manual valve: The taps are located on the left side of the valve. The connection closest to
the back, marked with ‘IN’ is the inlet and the outlet marked with ‘OUT’ is
closest to the front.
 Loosen the set screw inside the tap with a 1/8” wide flat screw driver.
 Connect a 1/4” rubber tube to the tap and to the manometer.
 Be sure to tighten the set screw inside the tap after you are finish taking pressure readings.
 Check for leaks.
CHECKING INLET AND OUTLET GAS PRESSURE
CHECKING AND ADJUSTING PILOT
The pilot flame should have the characteristic as shown in the illustration below. The flame
should not have yellow tips but should engulf the thermocouple and thermopile. It can be adjusted
be turning the screw marked “pilot” on the control valve.
CHANGING MAIN BURNER ORIFICE
 Remove the glass door, log set and brick panels (if used)
 Remove the burner by removing the screws holding the burner and cover plate
 Use two wrenches to loosen and remove the cap orifice.
 Change the orifice.
 Replace the burner and the log set and brick panels if used.
 Test fire the appliance with the glass door off and check for gas leaks.
 Replace the glass door.