IX. Service, Low water cutoff if so equipped

IX. Service

DANGER

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.

Assure that all gas valves and electrical disconnect switches are off 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.

WARNING

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 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 ﬁeld. 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, 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.

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.

SCG specifications

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