Benchmark 750-3000 Operation, Service & Maintenance Guide-Latin America
SECTION 4 – MAINTENANCE
OMM-0132A
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
49
of
162
GF-206-LA-LA
Ph.: 800-526-0288
01/02/2018
BMK 1500-3000 Burner Inspection Instructions
Figure 4-5d: BMK 2500/3000 Burner Assembly Mounting Details
6. Disconnect the cable from the igniter-injector.
7. Using a 7/16” open-end wrench, disconnect the compression nut securing the gas injector
tube of the igniter-injector to the elbow of the staged ignition assembly (see Figure 4-2b
(BMK 1500/2000) or Figure 4-2c (BMK 2500/3000). Disconnect the staged ignition
assembly from the igniter-injector.
8. Next, loosen and remove the igniter-injector from the burner plate using a 1" open-end
wrench.
9. Loosen and remove the four 5/16 x 1-3/4” bolts, washers, and nuts from the blower plenum
where it attaches to the blower. See Figure 4-5a & 4-5b (BMK 1500/2000) or Figure 4-5c &
4-5d (BMK 2500/3000).
10. You must either rig a support for the blower to hold it in place or remove the blower from
the unit and set it aside for later reassembly.
11. Remove the eight (8) 3/8-16 nuts, using a 9/16” wrench, attaching the blower plenum to the
burner. See Figure 4-5a & 4-5b (BMK 1500/2000) or Figure 4-5c & 4-5d (BMK 2500/3000).
12. Remove the blower plenum from between the blower and the burner and set it aside for
later reassembly. The O
2
sensor and flame observation port remain assembled to the
plenum flange.
13. Remove the burner by pulling straight up.
NOTE:
The burner assembly weighs approximately 65 lbs. (29.5 kg).
3/8”-16
HEX NUTS
(8 each)
5/16” x 1-3/4” BOLTS,
5/16” WASHERS &
NYLOCK NUTS
(4 each)
A/F VALVE
PLENUM
AIR
FILTER
AIR/FUEL
VALVE
GAS
TRAIN
BLOWER
PLENUM
GAS INLET
PIPE
BLOCKED INLET
SWITCH
BLOWER
PROOF
SWITCH
BLOWER
MANUAL
SHUT-OFF
VALVE
