AERCO BMK 2000DF User Manual
Page 97
Benchmark 1500DF - 2000DF Boilers
CHAPTER 7 – MAINTENANCE
OMM-0098_0A
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Page 97 of 196
GF-144
Ph.: 800-526-0288
04/01/2014
Burner Assembly Inspection and Maintenance Procedures (Cont.)
11.
Remove the eight (8) 3/8-16 nuts, using a 9/16” wrench, attaching the blower plenum to
the burner beneath (see Figure 7-4a & 7-4b).
12.
Remove the blower plenum from between the blower and the burner and set aside for
later reassembly. O2 sensor and flame observation port remain assembled to the plenum
flange.
NOTE
The burner assembly is heavy, weighing approximately 65 lbs.
13.
Remove the burner by pulling straight up.
14.
Remove and replace the burner gasket(s) (see Figure 7-5).
IMPORTANT!
ALL THREE gaskets provided for maintenance MUST be installed
during this procedure, as shown in Figure 7-5, even if there is only
one existing gasket being replaced. Note that the LOWER
RELEASE GASKET has tabs, which the others do not.
NOTE
During reassembly, apply a light coating of high-temperature, anti-
seize lubricant to the threads of the igniter-injector and grounding
screw. Also, ensure that the igniter-injector is properly positioned
as indicated in Figure 7-3. Torque the igniter-injector to 170 - 180
in-lbs.
15.
Beginning with the burner assembly, reinstall all the components in the reverse order that
they were removed. When reinstalling the blower plenum (removed in step 11), tighten
the 3/8-16 nuts using a typical torque pattern (for example, loosely tighten one nut, then
loosely tighten a second nut on the opposite side, a third at 90 degrees to the first two,
and a fourth opposite the third, and then repeat this pattern with the remaining four nuts.
Repeat the entire pattern a second time to partially tighten all eight nuts, and then repeat
a third time until all eight nuts are fully torqued to 22 ft. lbs).
16.
Ensure that the igniter-injector and flame detector cutouts in the burner plate are properly
aligned with the heat exchanger top flange.