AERCO BMK 2.0 LN Dual Fuel Serial G-11-2402 and UP - Manual (Page 78)

CHAPTER 7: MAINTENANCE
Page 78 of 160 PR2: 04/22/13
Benchmark 2.0LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0052_0E
GF-127
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
IGNITOR-
INJECTOR
3/8-16
NUTS (8)
BLOWER
BURNER
PLATE
AIR/FUEL
VALVE
FLAME
DETECTOR
STAGED
IGNITION
ASSEMBLY
1/2” BOLTS & NUTS (4)
CONNECT AIR/FUEL VALVE
TO GAS TRAIN
GROUNDING
SCREW
(10-32 x 1/2" LG.)
Figure 7-5: Burner Assembly Mounting Details
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 7-2).
Disconnect the staged ignition assembly from the igniter-injector.
IMPORTANT
Prior to removing the igniter-injector, note the position of the gas
injector tube relative to the burner plate and blower. This is
necessary to ensure that the igniter injector is reinstalled in the
proper orientation when it is reconnected to the staged ignition
assembly.
8. Next, loosen and remove the igniter-injector from the burner plate using a 1" open-end
wrench.
9. Disconnect the unit wiring harness connectors from the air/fuel valve and blower motor.
10. Disconnect the wire leads connected to the blower proof switch and blocked inlet switch
(Figures 7-6).
11. Remove the 10-32 x 1/2" long grounding screw from the burner plate (Figures 7-4).
12. Disconnect the gas train from the air/fuel valve by removing the four (4) 1/2” bolts and nuts
(Figure 7-5).