Aerco Benchmark 2000 - Page 93

Benchmark 1500 - 2000 Boilers
CHAPTER 7 – MAINTENANCE
OMM-0097_0E AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 93 of 182
GF-142 Ph.: 800-526-0288 10/01/2015
Burner Assembly Inspection and Maintenance Procedure – Continued
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. (19.2 - 20.3 Nm).
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. (29.8 Nm).
16. Ensure that the igniter-injector and flame detector cutouts in the burner plate are properly
aligned with the heat exchanger top flange.
Figure 7-4a: Burner Assembly Mounting Details
5/16” x 1-3/4”
BOLTS, 5/16”
WASHERS &
NYLOCK NUTS
(4 each)
BLOWER PLENUM
GAS TRAIN
AIR
FILTER
A/F VALVE
PLENUM
BLOWER
BURNER
PLATE
3/8”-16
HEX NUTS
(8 each)
IGNITER-
INJECTOR
ASSEMBLY
1/2” NUTS
& BOLTS
(4 each)