Lochinvar knight 81-286 User Manual

        

                       Service Manual

•  Refer to Section 3 - General Venting of the Knight Boiler Installation and Operation Manual 
  for the proper venting and air intake methods for the Knight boiler.

•  Check for obstructions at the vent/air intake terminals.

• Refer to Section 7 - Gas Connections of the Knight Boiler Installation and Operation 
  Manual for the proper gas supply for the Knight boiler.

•  Refer to page 31 of this manual for burner removal and cleaning procedures.

•  Replace burner if necessary.

•  Refer to this page for the gas valve adjustment procedure.

If adjustment of the gas valve is deemed necessary, use the 
following procedure: 

Locate the throttle adjustment screw on the side of the 
venturi valve (FIG. 3-2).  Using a screwdriver, turn the screw 
a 1/4 turn counterclockwise to increase CO

2

 levels or a 1/4 

turn clockwise to decrease CO

2

 levels.  After performing 

one adjustment on the valve, follow the Combustion 
Analysis Procedure on page 46 of this manual to measure the 
combustion.

If combustion is still not within the specified range, repeat 
the procedure.  This procedure SHOULD NOT be performed 
more than four (4) times.  If after four (4) adjustments and 
the combustion is still not within the specified range, revisit 
the possible causes in Table 3-6 or replace the gas valve.