Raypak 503-2003 manual Preventive Maintenance Schedule, Periodically, Weekly, Semi-Annually

densate management system or drain, as required by local codes.

3.Check that area is free from combustible materi- als, gasoline, and other flammable vapors and liquids.

4.Check air filter and replace as necessary.

5.Follow pre-start-up check in the Start-up section.

6.Visually inspect burner flame. It should be light blue at full input. Remove and visually inspect hot surface igniter and sensor for damage, cracking or debris build-up.

7.Check operation of safety devices. Refer to manu- facturers’ instructions.

8.Follow oil-lubricating instructions on pump (if re- quired). Over-oiling will damage pump. Water-lubricated circulators do not need oiling.

9.To avoid potential of severe burn, DO NOT REST HANDS ON OR GRASP PIPES. Use a light touch; return piping will heat up quickly.

10.Check blower and blower motor.

11.Check for piping leaks around pumps, relief valves and other fittings. Repair, if found. DO NOT use petroleum-based stop-leak.

Periodically

1.Check relief valve. Refer to manufacturer’s instructions on valve.

2.Test low water cut-off (if equipped). Refer to manu- facturer’s instructions.

Preventive Maintenance Schedule

The following procedures are recommended and are good practice for all MVB installations.

Daily

1.Check gauges, monitors and indicators.

2.Check instrument and equipment settings. (See “Post Start-Up Check” on page 45.)

3.Check burner flame. (Should see light blue flame at full input rate).

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Weekly

For low-pressure heaters, test low-water cut-off device. (With heater in pre-purge, depress the low water cut-off test button. Appliance should shut-off and ignition fault light should come on. Depress reset button on front of heater control panel to reset).

Monthly

1.Check flue, vent, stack, or outlet dampers.

2.Test blower air pressure. (See “Blower Check” on page 42.)

3.Test high and low gas pressure interlocks (if equipped). (See “Safety Inspection” on page 43.)

Semi-Annually

1.Recalibrate all indicating and recording gauges.

2.Check flame failure detection system components.

3.Check firing rate control by checking the manifold pressure. (See “Manifold Check” on page 43.)

4.Check piping and wiring of all interlocks and shut- off valves.

5.Check air filter and replace as necessary.

Annually

1.Test flame failure detection system and pilot turn- down.

2.Test high limit and operating temperature. (See “Post Start-Up Check,” page 45.)

3.Check flame sensor.

4.Conduct a combustion test at full fire. Carbon diox- ide should be 8.5 to 9.0% at full fire for natural gas, and between 9.5 to 10.0% for propane gas. Carbon monoxide should be < 100 ppm.

5.Check valve coil for 60 cycle hum or buzz. Check for leaks at all valve fittings using a soapy water solution (while heater is operating). Test other operating parts of all safety shut-off and control valves and increase or decrease settings (depending on the type of control) until the safety circuit opens. Reset to original setting after each device is tested.