Benchmark 2500 - 3000 Boilers
CHAPTER 7 – MAINTENANCE
Page
92
of
207
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0094_0F
09/30/2015
Ph.: 800-526-0288
GF-137
I
gniter-Injector Maintenance Procedures
–
Continued
NOTE
If a replacement igniter-injector (
Kit P/N
58023
) is being installed,
a compression nut containing a built-in ferrule will be included with
the replacement part. If needed, 3 indexing washers are also
included These washers may be needed to properly position the
gas injector tube of the igniter-injector within the 120° angle range
shown in Figure 7-3.
Figure 7-3. Igniter-Injector Orientation (Viewed Looking Down from Above)
10. Reinstall the igniter-injector in the burner plate.
Torque to
170 - 180 in-lbs (19.2 – 20.3
Nm)
.
DO NOT over tighten
.
11. 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.
12. Reconnect the igniter-injector cable.
13. Reinstall the shroud on the unit.
7.3 FLAME DETECTOR
The flame detector (kit P/N
24356-1
) is located on the burner plate at the top of the unit (see
Figures 7-1 and 7-2). The flame detector may be hot. Allow the unit to cool sufficiently before
removing the flame detector. Inspect or replace the flame detector as follows:
Flame Detector Maintenance
1. Set the
control panel ON/OFF switch to the
OFF
position. Disconnect AC power from the
unit.
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.
O2 SENSOR
BLOWER PLENUM
IGNITER-
INJECTOR
FLAME
OBSERVATION
PORT
120°
ANGLE OF
GAS INJECTOR
TUBE
