Burnham 20_PV_I manual VIII. Service, Clean Main Burners and Firebox

VIII. 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 17.

CAUTION

Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.

B.Inspect Housekeeping. Boiler area must be clear and free from combustible materials, gasoline and other flammable vapors and liquids. Remove obstructions to the flow of combustion and ventilation air.

C.Service Low water cut-off (if so equipped). Follow instructions provided with low water cut-off

D.Inspect Vent System for obstructions in vent pipe, soot accumulation, deterioration of pipe or joints, and proper support:

1.Remove vent connector and vent pipe. See Figure 19.

2.Remove all obstructions. Check and clean vent terminal screens.

3.Remove soot accumulations with wire brush and vacuum.

4.Replace deteriorated parts.

5.Repair deteriorated joints. See Section V: Venting, Paragraph D.6.

E.Inspect Boiler Flue Passages for blockage or soot accumulation. See Figure 19.

1.Disconnect vent connector from blower discharge flange.

2.Remove sheet metal screws securing Jacket Top Panel. Lift panel and rotate about relief valve piping until top of boiler is exposed. If piping or wall prevent full rotation of top panel for access to canopy, cut slot into relief valve opening and remove top panel.

3.Disconnect blower connection from wiring harness in vestibule.

4.Remove bolts securing canopy to boiler sections. Cut silastic sealant around base of canopy, pry canopy from boiler sections and remove canopy/ blower assembly from boiler.

5.Using flashlight, examine all flue passageways.

a.If passageways are free of soot and obstruction, replace canopy, secure and seal using kit available from Burnham Distributors, Part No. 6111716.

b.If passageways need cleaning, remove burners as described in Paragraph F below. Using long handle wire or bristle flue brush and vacuum, brush flueways thoroughly from top of boiler as illustrated in Figure 19. Replace canopy and seal using kit available from Burnham Distributors, Part No. 6111716.

WARNING

Canopy must be resealed with RTV-732

Silicone Rubber Sealant (500°F Intermittent

Duty).

6.Reinstall jacket top panel, vent pipe and vent connector in reverse manner. Reconnect electrical connector to blower.

F.Clean Main Burners and Firebox.

1.To remove burners for cleaning, changing orifice plugs, or repairs:

a.Remove jacket Front Panel.

b.Disconnect pilot tubing at gas valve.

c.Disconnect igniter/sensor cable and ground wire at Ignition Module.

d.Disconnect Flame Rollout Switch wires.

e.Remove Burner Access Panel.

f.Mark Pilot Main Burner location on Manifold.

g.Hold burner on throat. Lift slightly to clear orifice. Pull burner from combustion chamber. See Figure 11. Pilot Main Burner can only be removed by lifting at 45° angle after adjacent burner to right is removed.

2.Brush top of burners with a soft bristle brush. See Figure 19. Vacuum burners.

3.Check orifices. Drilled passageways must be free of lint or dirt.

4.Vacuum tip of Pilot Burner.

5.Clean firebox by vacuuming. Exercise care not to disturb insulation inside base.

6.Install burners by reversing procedure used to remove burners. Burner with pilot assembly must be in same location as original installation. See Table 7. Burners must be properly located on support bracket

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