AERCO BMK 1500-2000 - Manual (Page 87)

Benchmark 1500 - 2000 Boilers
CHAPTER 7 – MAINTENANCE
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Igniter-Injector Maintenance Procedures – Continued
4. Refer to the partial exploded view in Figure 7-2. 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. Disconnect the staged ignition assembly from the
igniter-injector.
5. Next, loosen and remove the igniter-injector from the burner plate using a 1" open-end
wrench.
6. Check the igniter-injector for evidence of erosion or carbon build-up. If there is evidence
of substantial erosion or carbon build-up, the igniter-injector should be replaced. If carbon
build-up is present, clean the component using fine emery cloth. Repeated carbon build-
up is an indication that the combustion settings of the unit should be checked. Refer to
Chapter 4 for combustion calibration procedures.
Figure 7-2: Igniter-Injector & Flame Detector Mounting Details
7. Next, loosen and remove the igniter-injector from the burner plate using a 1" open-end
wrench.
8. Check the igniter-injector for evidence of erosion or carbon build-up. If there is evidence
of substantial erosion or carbon build-up, the igniter-injector should be replaced. If carbon
build-up is present, clean the component using fine emery cloth. Repeated carbon build-
up is an indication that the combustion settings of the unit should be checked. Refer to
Chapter 4 for combustion calibration procedures.
9. Prior to reinstalling the igniter-injector, a high temperature, conductive, anti-seize com-
pound must be applied to the threads.
STAGED
IGNITION
SOLENOID
FLAME
DETECTOR &
GASKET
FLAME
OBSER-
VATION
PORT
INJECTOR-
IGNITOR
ASSY WITH
INDEXING
(CLOCKING)
WASHERS
(0-3 as
needed)
O2 SENSOR
& WASHER
FLEX GAS
HOSE
NIPPLE
COMPRESSION FITTING & ELBOW
BURNER PLATE
FLANGE
BLOWER
PLENUM