Flame Detector - Watts Aerco BENCHMARK 750 User Manual

Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL
IGNITER-INJECTOR MAINTENANCE PROCEDURES – Continued
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.
BLOWER
BURNER PLATE
IGNITER-INJECTOR
INJECTOR TUBE
Figure 7-3: Igniter-Injector Orientation (Viewed Looking Down from Above)
8. Reinstall the igniter-injector in the burner plate. Torque to 170 - 180 in-lbs (19.2 – 20.3
Nm). DO NOT over tighten.
9. 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.
10. Reconnect the igniter-injector cable.
11. 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:
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.
3. Disconnect the flame detector lead wire.
Page 88 of 170
11/03/2016
CHAPTER 7 – MAINTENANCE
NOTE
Flame Detector Maintenance
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
120°
INJECTOR TUBE
ANGLE
OMM-0119_0A
GF-130-I