Instruction Manual

Benchmark 750/1000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 7 – MAINTENANCE
Page 92 of 192 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0082_0J
05/21/2014 Ph.: 800-526-0288 GF-130
Igniter-Injector Replacement – Continued
Figure 7-3: Igniter-Injector Orientation (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 REPLACEMENT
The flame detector (P/N 24356-1) is located on the burner plate at the top of the unit (see Figure
7-1 and Figure 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 Replacement
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.
4. Remove the two (2) screws securing the flame detector to the plate (Figure 7-2 on
previous page). The flame detector is secured to the burner plate with one #10-32 screw
and one #8-32 screw.
5. Remove the flame detector and gasket from the burner plate.
6. Thoroughly inspect the flame detector. If eroded, the detector should be replaced.
Otherwise clean the detector with a fine emery cloth.
7. Reinstall the flame detector and flame detector gasket.
8. Reconnect the flame detector lead wire.
9. Reinstall the shroud on the unit.
INJECTOR TUBE
120°
INJECTER-IGNITOR
INJECTOR TUBE
ANGLE
BURNER PLATE
BLOWER