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Benchmark 2.0LN Dual-Fuel Low NOx Boiler
CHAPTER 7: MAINTENANCE
8. Reinstall the igniter-injector in the burner plate. Torque to 15 ft-lbs. 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 side and top panels on the unit.
7.3 FLAME DETECTOR
The flame detector (part no. 66006) 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.
To inspect or replace the flame detector:
1. Set the ON/OFF switch on the control panel, to the OFF position. Disconnect AC power
from the unit.
2. Remove the side and top panels from the unit.
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 (1) #10-32
screw and one (1) #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 side and top panels on the unit.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Page 76 of 158
Operation and Maintenance Manual
Figure 7-3: Igniter-Injector Orientation
GF-127
OMM-0052_0E
PR2: 04/22/13
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