Aerco Benchmark BMK 750 User Manual page 41

Benchmark 750-3000 Boiler Operation, Service, Maintenance Guide - KOREA
SECTION 4 – MAINTENANCE
Igniter-Injector Maintenance Procedure Instructions
COMPRESSION
FITTING &
ELBOW
BLOWER
PLENUM
O2 SENSOR
& WASHER
INJECTOR-IGNITOR
ASSY WITH INDEXING
(CLOCKING) WASHERS
(0-3 as needed)
Figure 4-2c: BMK 2500/3000 Igniter-Injector & Flame Detector Mounting Details
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. To review
combustion calibration procedures, refer to Section 4.3 of the Benchmark 750 – 3000
Boiler Installation and Startup Guide Guide, OMM-0127 (GF-205-K).
7. Prior to reinstalling the igniter-injector, apply a high temperature, conductive, anti-seize
compound to the threads.
8. Reinstall the igniter-injector in the burner plate using 1 to 3 indexing washers, as needed,
so that when the igniter-injector is tightened, its injector tube will be positioned within the
approximately 120° arc shown in Figure 4-3a through 4-3c, below. Note, the recommended
injection tube positioning differs for the positioning recommended in the past.
9. Torque the igniter-injector to 170 - 180 in-lbs. (19.2 – 20.3 Nm). DO NOT over tighten.
NOTE:
If a replacement igniter-injector (Kit P/N 58023) is being installed, a compression nut
containing a built-in ferrule and 3 indexing washers are included with the kit.
10. Connect the staged ignition assembly to the gas injector tube of the igniter-injector by
securing the compression nut to the elbow of the staged ignition assembly.
11. Reconnect the igniter-injector cable.
12. Reinstall the shroud on the unit.
OMM-0128_0C
GF-206-K
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
STAGED IGNITION
SOLENOID
FLAME
DETECTOR &
GASKET
FLEX GAS
HOSE NIPPLE
FLAME
OBSERVATION
PORT
BURNER PLATE
FLANGE
Page 41 of 146
11/29/2017