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
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
7.Check operation of safety devices. Refer to manu- facturers’ instructions.
8.Follow
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
Periodically
1.Check relief valve. Refer to manufacturer’s instructions on valve.
2.Test low water
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
3.Check burner flame. (Should see light blue flame at full input rate).
49
Weekly
For
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
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