g. Remove burner drawer assembly. To accomplish, close manual gas valve to unit and break main gas supply at
union. Cut furnace electrical supply. Unscrew the two quick fasteners at the bottom of the control access panel.
Pull bottom of panel away slightly and allow panel to drop. Remove panel and disconnect applicable electric
wiring. Remove retaining tabs at each end of the burner drawer and slide drawer assembly out of the furnace.
h. Remove the screws holding top panel and lift panel off.
i. Remove the screws from bottom flange of the collector box cover and lift cover off.
j. Remove the screws from bottom flange of the collector box. Remove the two screws from the venter motor
support at the right heater leg and disconnect the three conductor cables at the junction box. Lift collector box off.
(Power venter assembly will remain attached to the collector box.)
k. Lift flue baffles from tubes
l. Clean the inner surfaces of flue tubes using a 1-1/2” or 1-3/4” long-handled wire brush. Clean and replace flue
baffles.
m. Remove dirt from bottom pan and clean burners before replacing drawer assembly.
·
Cleaning Burners:
1. Burners can be removed from drawer assembly by raising front of burner, pushing burner forward against the
hold-down clip until venturi end of burner is free of support. Remove burners next to pilot last and replace these
burners first.
2. Remove ribbon cotter pin and carefully pry ribbon from slot.
3. Clean ribbon with brush and blow off dust.
4. Replace ribbon and cotter pin.
5. Replace burners, making certain that they seat properly in place.
6. Failure to re-seat burner assemblies properly could result in fire, explosion, equipment damage or death.
·
Cleaning Pilot:
1. Disconnect tubing from pilot body, remove igniter lead and detach pilot burner assembly from support.
2. Remove pilot orifice fitting.
3. Using a small brush, clean pilot burner assembly, orifice, and flame rod. Blow off loose particles.
4. Assemble and install in original position.
5. Adjust pilot flame to surround flame rod tip about 3/8”. Flame must be soft – not hard, noisy, or yellow.
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