PREVENTIVE MAINTENANCE SCHEDULE
Required procedure in
Daily
1.Check gages, monitors and indicators. (See page 6 of the Operating and Installation Instructions Manual).
2.Check instrument and equipment settings. (See page
3.Check burner flame. (Should see light blue flame).
Weekly
1.For
2.Check igniter. (Resistance reading should be 30- 70 ohms).
3.Check flame signal strength. (Flame signal should be greater than 1 microamp).
4.Check flame failure detection system. (See attached Turn Down Test Procedure).
5.Check firing rate control. (Check manifold pressure, see page 50 of the Operating and Installation Instructions Manual).
6.Make aural and visual check of pilot and main fuel valves.
Monthly
1.Check flue, vent, stack, or outlet dampers.
2.Test fan air pressure. (See page 50 of the Operating and Installation Instructions Manual).
3.Test high and low gas pressure interlocks. (See page 50 of the Operating and Installation Instructions Manual).
Semi-Annually
1.Recalibrate all indicating and recording gages.
2.Check flame failure detection system components. (See Turn Down Test Procedure).
3.Check firing rate control. (Check manifold pressure, see page 50 of the Operating and Installation Instructions Manual).
4.Check piping and wiring of all interlocks and shutoff valves.
5.Inspect burner components.
Annually
1.Flame failure detection system, pilot turndown test.
2.Test high limit and operating temperature. (See page 48 of the Operating and Installation Instructions Manual).
3.Check flame sensors, (Flame signal should be greater than 1 microamp).
4.Conduct a combustion test. (Carbon Dioxide
5.Check all coils and diaphragms; test other operating parts of all safety shutoff and control valves. Coils- check for 60 cycle hum or buzz; diaphragms- using soapy water solution check for leaks on the vent outlets and all fittings on the valves; on other safety devices increase or decrease settings (depending on the type of control) until the safety circuit opens. Reset to original setting after each device is tested.
6.Perform leakage test on pilot and main gas valves. (See Leak Test Procedure).
7.Test purge air switch in accordance with manufacturer’s instructions. (Turn panel switch to the on position until blower is proven, then turn the switch to off. Blower should stay on for approximately 30 seconds).
8. | Test burner position interlock in accordance with manufacturer’s instructions. (Remove front panel and visually |
| check burner orientation, all three screws holding the burner must be in place and flat portion of the flange must be |
| on top in the horizontal position). |
As Required
1.Recondition or replace low water fuel cutoff device.
2.For gas fired burners, check drip leg and gas strainers.
3.Flame failure detection system, pilot turndown test.
4.Test safety/safety relief valves in accordance with ASME Boiler and Pressure Vessel Code Sections VI and VII.
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