Lochinvar 151-286 Inspect ignition and flame sense electrodes, Check ignition ground wiring

Outdoor Knight Boiler Installation & Operation Manual

9 Maintenance

Inspect ignition and flame sense electrodes

1.Remove the ignition and flame sense electrodes from the boiler heat exchanger access cover.

2.Remove any deposits accumulated on the ignition/flame sense electrode using sandpaper. If the electrodes cannot be cleaned satisfactorily, replace with new ones.

3.Replace ignition/flame sense electrode, making sure gasket is in good condition and correctly positioned.

Check ignition ground wiring

1.	Inspect boiler ground wire from the heat exchanger
	access cover to ground terminal strip.
2.	Verify all wiring is in good condition and securely
	attached.
3.	Check ground continuity of wiring using continuity
	meter.

Check burner flame

1.Inspect flame through observation window.

2.If the flame is unsatisfactory at either high fire or low fire, turn off boiler and allow boiler to cool down. Remove the burner and clean it thoroughly using a vacuum cleaner or compressed air. Do not use compressed air to clean burner if performed inside a building.

3.Remove the burner, reference FIG. 9-2 below.

4.When replacing the burner, ensure gasket is in good condition and positioned correctly (FIG. 9-2).

Figure 9-2Burner Assembly

4. Replace ground wires if ground continuity is not

satisfactory.

Check all boiler wiring

1.Inspect all boiler wiring, making sure wires are in good condition and securely attached.

Check control settings

1. Set the SMART SYSTEM control module display to

Parameter Mode and check all settings. See Section 1 of

Outdoor Knight Boiler Service Manual. Adjust settings

INSULATION

HEAT EXCHANGER ACCESS DOOR

AIR / GAS ARM

BURNER

GASKET

SCREWS (QTY. 5)

IMG00447

if necessary. See Section 1 of the Outdoor Knight Boiler

Service Manual for adjustment procedures.

2. Check settings of external limit controls (if any) and

adjust if necessary.

Perform start-up and checks

1.Start boiler and perform checks and tests specified in Section 7 - Start-up.

2.Verify cold fill pressure is correct and that operating pressure does not go too high.

Check flame signal

1.At high fire the flame signal shown on the display should be at least 10 microamps.

2.A lower flame signal may indicate a fouled or damaged flame sense electrode. If cleaning the flame sense electrode does not improve, ground wiring is in good condition, and ground continuity is satisfactory, replace the flame sense electrode.

3.See Section 3 - Troubleshooting of the Outdoor Knight Boiler Service Manual for other procedures to deal with low flame signal.

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