AERCO BMK 2.0 LN Nat. Gas June 2010 - Manual (Page 58)

MAINTENANCE
7.2 IGNITOR-INJECTOR
The ignitor-injector (part no. 58023) is located on
the burner plate at the top of the boiler. In
addition to providing the ignition spark required
to light the burner, the ignitor-injector also
contains a gas injector tube which connects to
the staged ignition assembly. Figure 7-1 shows
the complete burner assembly removed from the
boiler and indicates the location of the ignitor-
injector flame detector and other related
components.
The ignitor-injector may be hot, therefore, care
should be exercised to avoid burns. It is easier
to remove the ignitor-injector from the unit after
the unit has cooled to room temperature.
AIR/FUEL
VALVE
STAGED
IGNITION
ASSEMBLY
FLAME
DETECTOR
IGNITOR-
INJECTOR
BLOWER
BURNER
PLATE
BURNER
Figure 7-1
Benchmark 2 ly
o inspect/replace the Igniter:
1. Set the ON/OFF switch on the control panel,
side and top panels from the
nnect the cable from the ignitor-
.0LN Burner Assemb
(Shown Removed from Boiler)
T
to the OFF position. Disconnect AC power
from the unit
2. Remove the
unit.
3. Disco
injector.
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 ignitor-injector to the
elbow of the staged ignition assembly.
Disconnect the staged ignition assembly
from the ignitor-injector.
STAGED
IGNITION
ASSEMBLY
FLAME
DETECTOR IGNITOR-
INJECTOR
BURNER
PLATE
COMPRESSION
FITTING & ELBOW
FLAME
DETECTOR
GASKET
INDEXING
WASHERS
(QTY = 0-3
AS REQ’D)
Figure 7-2
Ignitor-Injector & Flame Detector
Mounting Details
IMPORTANT
Prior to removing the ignitor-injector,
note the position of the gas injector
tube relative to the burner plate and
blower. This is necessary to ensure
that the ignitor injector is reinstalled in
the proper orientation when it is
reconnected to the staged ignition
assembly.
5. Next, loosen and remove the ignitor-injector
from the burner plate using a 1" open-end
wrench.
6. Check the ignitor-injector for evidence of
erosion or carbon build-up. If there is
evidence of substantial erosion or carbon
build-up, the ignitor-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.
7. Prior to reinstalling the ignitor-injector, a high
temperature, conductive anti-seize com-
pound must be applied to the threads.
7-2