Owner manual

Benchmark 1500DF - 2000DF Boilers
CHAPTER 7 – MAINTENANCE
Page 94 of 196 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0098_0A
04/01/2014 Ph.: 800-526-0288 GF-144
IGNITER-INJECTOR MAINTENANCE PROCEDURES – Continued
NOTE
If a replacement igniter-injector (part no. 66026) 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. 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 (part no. 66020) 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
ANGLE OF GAS
INJECTOR
TUBE
120°
FLAME
ROD