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68
IX. Service
A. 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 37.
B. 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
fi eld. Complete replacement mechanisms, including
necessary gaskets and installation instructions, are
available from the manufacturer.
C. Vent/Air Intake System. Inspect for obstructions, soot
accumulation, proper support, and deterioration of pipe,
fi ttings, 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 fi ve (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 fl ow freely. To Clean:
a. Disconnect drain tube from drain fi tting.
b. Flush drain tube with water. Fill trap with water.
c. Securely fasten drain tube to drain fi tting,
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.
D. Boiler Flue Passages. Inspect for blockage or soot
accumulation.
1. Remove Main Burners. See Figure 42.
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.
REGNAD
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