23
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 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 (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:
a. Remove locking band (vent pipe only).
b. Break skin of sealant with utility knife. Do not
cut or score pipe.
c. Pull pipe from fi tting.
d. Clean pipe and fi tting of all cured sealant.
e. Join pipe and fi tting as described in Section VI:
Venting/Air Intake Piping.
E. Boiler Flue Passages. Inspect for blockage or soot
accumulation.
1. Remove Main Burners. See Figure 25.
a. Remove jacket front door.
b. Remove combustion air enclosure cover.
c. Remove Burner Access Panel by lifting up and
out.
d. Disconnect Ignitor/Sensor Wire from pilot
burner.
e. Mark location of Main Burner with Pilot Bracket
on gas manifold.
f. Remove External Hitch Pin Clips.
g. Hold Main Burner on throat. Lift slightly while
pushing toward rear of boiler to disengage from
Burner Tray and to clear Gas Orifi ce. Pull Main
Burner from combustion chamber.
2. Remove four (4) locknuts securing vent connector.
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 22.
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B. Inspect domestic hot water coil gasket for water
leakage. Tighten nuts or replace gasket if leakage is
evident.
C. Low water cut-off (if so equipped).
1. Float Type
a. Monthly Blowoff. During the heating season, if
an external fl oat type low water cut-off is on the
boiler, the blow off valve should be opened once
a month (use greater frequency where conditions
warrant), to fl ush out the sediment chamber so
the device will be free to function properly.
b. Annual Service. Float type low water cutoffs
should be dismantled annually by qualifi ed
personnel, to the extent necessary to insure
freedom from obstructions and proper
functioning of the working parts. Inspect
connecting lines to boiler for accumulation of
mud, scale, etc., and clean as required. Examine
all visible wiring for brittle or worn insulation
and make sure electrical contacts are clean and
that they function properly. Give special
attention to solder joints on bellows and fl oat
when this type of control is used. Check fl oat for
evidence of collapse and check mercury bulb
(where applicable) for mercury separation or
discoloration.
2. 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.
D. Vent/Air Intake System. Inspect for obstructions, soot
accumulation, proper support, and deterioration of pipe,
fi ttings, and joints.
IX. Service