Burnham 1100-H4 User Manual

  General. Inspection and service should be conducted 

annually. Turn off electrical power and gas supply while 

conducting service or maintenance. Follow instructions 

TO TURN OFF GAS TO APPLIANCE. See Figure 36.

  Low water cutoff (if so equipped).

 

Probe Type (Annual Service).  Probe type LWCO 

should be removed once a year, examined and 

cleaned of any dirt accumulations to assure proper 

operations.  Do not attempt to repair mechanisms in the 

field.  Complete replacement mechanisms, including 

necessary gaskets and installation instructions, are 

available from the manufacturer.

  Vent/Air Intake System. Inspect for obstructions, soot 

accumulation, proper support, and deterioration of pipe, 

fittings, and joints.
1.  Clean terminal screens. Terminals must be free of 

obstruction, undamaged, with screens securely in 

place.

2.  Terminal and wall thimbles (if used) must be 

weathertight.

3.  Pipe must be full round shape, and show no damage 

from impact or excessive temperature.

4.  Pipe must be supported at minimum five (5) foot 

intervals and must not sag.

5.  All vent joints must be secure and watertight.
6.  All air intake joints must be secure and airtight.  

Horizontal vent tee drain or vertical vent tee drain 

(if used) must have minimum 6 inch trap and allow 

condensate to flow freely.  To Clean:
a.  Disconnect drain tube from drain fitting.
b.  Flush drain tube with water. Fill trap with water.
c.  Securely fasten drain tube to drain fitting, 

providing gas-tight and watertight seal.

7.   If pipe must be disassembled for removal of 

obstructions or resealing of joint, see Section III, 

Paragraph C.

  Boiler Flue Passages.  Inspect for blockage or soot 

accumulation.
1.  Remove Main Burners.  See Figure 44.

a.  Remove front door.
b.  Remove air intake box front door.

i.  Remove sheet metal screws.

c.  Disconnect pilot tubing and pilot lead wires at 

the gas valve.