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Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual
3. Disconnect the flame detector lead wire.
4. Remove the two (2) screws securing the flame detector to the plate (Figure 7-2). 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.
7.4 O
SENSOR
2
The Lean Oxygen Sensor (part no. 61026) is located on the burner plate at the top of the unit (see
Figures 7-1 and 7-2). The burner plate and this component may be hot, so allow the unit to cool
sufficiently before removing or replacing the O
1. Set the ON/OFF switch on the control panel, 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 O
connector.
4.
Next, loosen and remove the O
15/16" open-end wrench.
5. Thoroughly inspect the O
clean the sensor with a fine emery cloth.
6. Reinstall the O
7. Reconnect the sensor lead wire.
8. Reinstall the shroud on the unit.
7.5 SAFETY DEVICE TESTING
Systematic and thorough tests of the operating and safety devices should be performed to ensure that
they are operating as designed. Certain code requirements, such as ASME CSD-1, require that these
tests be performed on a scheduled basis. Test schedules must conform to local jurisdictions. The results
of the tests should be recorded in a log book. See Chapter 6-Safety Device Testing Procedures.
OMM-0099_0A
GF-145
CHAPTER 7 – MAINTENANCE
Flame Detector Maintenance - Continued
2
O
Sensor Maintenance Procedures
2
sensor lead wire by pushing in on the release tab and pulling apart the
2
sensor and crush washer from the burner plate using a
2
sensor. If eroded, the sensor should be replaced. Otherwise
2
sensor and crush washer on the burner plate.
2
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
sensor.
Page 95 of 234
PR1: 05/21/2014
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