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8.Mark the location of the pilot main burner on the
manifold if the marking on manifold is missing or
obliterated.
9.Hold burner at throat,
a. 1 inch and 40mm diameter burners. Lift front of
burner to clear orifice. Burner which holds pilot
can only be removed by lifting the burner adjacent
to its right first.
b. 50 mm dia. burners only. Push toward the rear until
the burner face plate clears the orifice. Lift burner
out.
10.Brush top of burners with a soft bristle brush, see
Fig. 30. Vacuum burners. Check orifices to see
that drilled passageways are free of lint or dirt.
11.Vacuum tip of Pilot Burner.
B. CLEAN FIREBOX by vacuuming. Exercise care not
to disturb insulation inside the base.
Figure 30: Burner Cleaning and Installation
C. INSTALL BURNERS by reversing procedure used to
remove burners. Make sure burner with pilot assembly is
in same location as original installation - see Table 5
Check burners to see that they are located properly in
slot at rear of burner tray, see Fig. 30. Reinstall
injection shield assembly (40mm and 50mm burners
only, where used) and burner access panel. Reconnect
flame roll-out switch wires, pilot gas supply, thermo-
couple lead or pilot lead.
D. CHECK MAIN BURNER and PILOT FLAMES, see
procedure Section II, paragraphs 5 and 6.
5. CHECK ALL CONTROL AND DAMPER OPERA-
TION ANNUALLY see procedure in Section II, paragraphs
7 through 10.
6. REMOVAL OR REPLACEMENT OF PILOT AS-
SEMBLY OR PILOT ASSEMBLY PARTS
If pilot assembly, thermocouple or pilot orifice need
replacing, remove main burner with pilot using procedure
described in Paragraph 4.
A. To replace orifice:
1.Disconnect pilot tubing. The Robertshaw 7CL-6,
Honeywell Q350 and Q3450 pilot orifices are insert
type retained by the compression fitting. The Honey-
well Q327 and Q3480 pilot orifice is a spud type
screwed into pilot burner. Replace with desired
orifice. See Key No. 5B.
2.Reconnect pilot tubing and check for leaks.
B. To replace Honeywell Q309A thermocouple in Q327
or Q350 pilot:
1.Loosen attachment nut securing thermocouple to
barrel of pilot burner. Disconnect other end at
combination gas valve.
2.Remove thermocouple and replace with equal.
C. To replace Q3450 or Q3480 igniter-sensor rod
assembly:
1.Remove spring clip by pulling it away from the pilot
burner.
2.Remove assembly from pilot burner and disconnect
harness from gas valve.
3.Replace with equal.
D. To replace complete pilot assembly.
1.Remove machine screws holding pilot burner to pilot
bracket.
2.Disconnect pilot piping.
3.Disconnect all other leads to pilot.
4.Select pilot assembly with identical model number,
reconnect leads and pilot tubing - resecure to pilot
bracket.
E. Reinstall main burner following procedure described
in Paragraph 4.
1" Burner
50mm Burner
40mm Burner