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Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual
Igniter-Injector Maintenance Procedures - Continued
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.
O2 SENSOR
IGNITER-
INJECTOR
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:
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.
Page 94 of 234
05/21/2014
CHAPTER 7 – MAINTENANCE
NOTE
Flame Detector Maintenance
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
BURNER PLENUM
120°
ANGLE OF GAS
INJECTOR
TUBE
FLAME
OBSERVATION
PORT
OMM-0099_0A
GF-145
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