24
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 orifi ce 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.
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 fi ber gasketing from top of heat
exchanger.
c. Pry canopy from boiler sections.
7. Inspect fl ue passages. Clean with fl ue 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 fi ber 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 orifi ces for lint and dirt. Clean as
necessary.