Aerco Benchmark BMK 750 User Manual page 49

Benchmark 750-3000 Boiler Operation, Service, Maintenance Guide - KOREA
SECTION 4 – MAINTENANCE
BMK 1500-3000 Burner Inspection Instructions
5/16" x 1-3/4" BOLTS,
5/16" WASHERS &
NYLOCK NUTS
(4 each)
BLOWER
A/F VALVE
PLENUM
BLOWER
PROOF
SWITCH
AIR/FUEL
VALVE
BLOCKED INLET
SWITCH
AIR
FILTER
Figure 4-5d: BMK 2500/3000 Burner Assembly Mounting Details
1. Set the ON/OFF switch on the C-More Controller to the OFF position. Disconnect AC
power from the unit and turn off the gas supply.
2. Remove the top shroud from the unit by grasping the top handle and lifting straight up. This
will disengage the shroud from the four (4) pins in the side panels.
3. Disconnect the lead wire from the flame detector installed on the burner plate. See Figure
4-2b (BMK 1500/2000) or Figure 4-2c (BMK 2500/3000).
4. Remove the two (2) screws securing the flame detector to the plate. The flame detector is
secured to the burner plate with one (1) #10-32 screw and one (1) #8-32 screw.
5. Remove the flame detector and gasket from the burner plate.
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 Figures 4-5c
& 4-5d (BMK 2500/3000).
OMM-0128_0C
GF-206-K
BLOWER
PLENUM
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
3/8"-16
HEX NUTS
(8 each)
GAS INLET
PIPE
MANUAL
SHUT-OFF
VALVE
Page 49 of 146
11/29/2017