Service; Low Water Cutoff - Burnham PVG Installation, Operating And Service Instructions

IX. Service
This boiler uses flammable gas, high voltage electricity, moving parts, and very hot water under high
pressure. Assure that all gas and electric power supplies are off and that the water temperature is cool
before attempting any disassembly or service.
Do not attempt any service work if gas is present in the air in the vicinity of the boiler. Never modify,
remove or tamper with any control device.
This boiler must only be serviced and repaired by skilled and experienced service technicians.
If any controls are replaced, they must be replaced with identical models.
Read, understand and follow all the instructions and warnings contained in all the sections of this
manual.
If any electrical wires are disconnected during service, clearly label the wires and assure that the wires
are reconnected properly.
Never jump out or bypass any safety or operating control or component of this boiler.
Read, understand and follow all the instructions and warnings contained in ALL of the component
instruction manuals.
Assure that all safety and operating controls and components are operating properly before placing
the boiler back in 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 22.
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
field. Complete replacement mechanisms, including
necessary gaskets and installation instructions, are
available from the manufacturer.
C.
Vent 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.
DANGER
WARNING
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 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.
D.
Boiler Flue Passages. Inspect for blockage or soot
accumulation.
1. Remove Main Burners. See Figure 30.
a. Remove front door.
b. Disconnect pilot tubing and pilot lead wires at
the gas valve.
c. Remove wires to Flame Roll-out Switch.
d. Remove Burner Access Panel.
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