Burnham MMII manual Main Burners and Combustion Chamber, Lubrication

See Figure 9. Disconnect vent connector and vent pipe from blower outlet.

3.Remove Jacket Top Panels.

4.Disconnect Red and Black Silicone Tubing from Canopy. Pull tubing through Blower Access panel into vestibule.

5.Disconnect wiring harness from Blower Motor.

6.Remove Canopy/Blower Assembly.

a.Remove four (4) machine screws securing canopy to heat exchanger.

b.Remove ceramic fiber gasketing from top of heat exchanger.

c.Pry canopy from boiler sections.

7.Inspect flue passages. Clean with flue brush. See Figure 25.

8.Inspect heating surface in combustion chamber. Clean with straight handle wire brush.

9.Replace Canopy/Blower Assembly and seal using ceramic fiber gasketing. Refer to Key No. 2 in Repair Parts Section for quantity and part number.

10.Connect Silicone Tubing between Pressure Fittings on Canopy Assembly and Pressure Switch. See Figure 26.

11.Install Jacket Top Panels.

12.Connect vent system. See Figure 9.

13.Connect Blower Motor Wiring Harness.

F. Main Burners and Combustion Chamber.

1.Vacuum combustion chamber. Exercise care - do not damage base insulation.

2.Clean main burners. Brush top of burners with soft bristle brush. See Figure 25. Vacuum to remove any dirt and lint.

3.Vacuum tip of pilot burner.

4.Check gas orifices for lint and dirt. Clean as necessary.

5.Install main burners by reversing procedure to remove burners.

a.Pilot burner must be installed in original location. See Table 10.

b.Main burners must be properly secured in burner tray slot at rear of combustion chamber and over gas orifice with hitch pin in place. See Figure 25.

c.Burner access panel must be securely in place.

d.Verify that Combustion Air Diffuser is securely in place.

e.If Flame Roll-out Switch wires were disconnected, they must be reconnected.

f.Air Intake Box Cover must be installed.

G.Check operation. Follow steps C through L from Section VIII: System Start-up.

H.Procedure for Measuring Fan Differential Pressure. (See Figure 27).

1.With boiler off, remove gray and black hoses at differential pressure switch.

2.With tees, connect water manometer as shown with additional tubing.

3.Start boiler and read pressure on manometer when boiler water temperature reaches operating temperature. Refer to Table 11 for minimum readings.

NOTE: If switch drops-out before boiler reaches temperature or if differential pressure readings are below minimums shown in Table 11, check for cracks in hoses or contact your nearest Burnham representative.

4.Stop boiler, remove manometer and reconnect hoses to pressure switch. See Figure 26.

I.Lubrication

There are no parts requiring lubrication on the part of the Service Technician or the User. Circulator bearings are water lubricated. Combustion blower motor uses sealed bearings.

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