AERCO BMK 6000 Dual Fuel - Manual (Page 105)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 7 – MAINTENANCE
OMM-0096_0B AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 105 of 219
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Ph.: 800-526-0288
03/21/2014
THE HEAT EXCHANGER INSULATION UTILIZES CERAMIC FIBER
MATERIAL. WEAR A FITTED NIOSH-APPROVED PARTICULATE
RESPIRATOR (3M N95 OR EQUIV.) WHEN SERVICING THE HEAT
EXCHANGER AND BURNER ASSEMBLIES. AT HIGH TEMPERATURES,
CERAMIC FIBERS CAN BE CONVERTED TO CRYSTALINE SILICA
FIBERS WHICH HAVE BEEN IDENTIFIED AS CARCINOGENIC WHEN
INHALED.
7.7 BURNER ASSEMBLY INSPECTION
The Burner assembly is located at the front of the unit's heat exchanger. The Burner assembly
may be hot. Therefore, allow the unit to cool sufficiently before removing the Burner assembly.
NOTE
In order to perform this procedure most efficiently with a minimum of steps,
a simple support rig has been designed to hold up the blower and Air/Fuel
Valve assembly while the blower plenum is removed to allow the Burner
assembly to be removed for maintenance. Use of this support will prevent
the blower’s weight from stressing the connection to the gas train. This
support rig prevents having to dismantle the entire Blower and Air/Fuel
Valve assembly from the gas train. The support rig is available as an after-
market part.
The following parts will be required for reassembly after Burner inspection:
Part No. Description
81159 Burner Gaskets (2)
To inspect or replace the Burner assembly, proceed as follows:
Burner Assembly Inspection and Maintenance Procedures
1. Set the ON/OFF switch on the control panel, to the OFF position. Disconnect AC power
from the unit and turn off the gas supply.
2. Remove the front panel, top panel and front side panels from the unit by grasping and
lifting straight up and outward. This will expose the blower assembly for removal.
3. Disconnect the lead wire from the Main Flame Detector installed on the Blower Flange
(Figure 7-1).
4. Remove the Main Flame Detector from the Blower Flange.
5. Remove the Pilot sensors and observation ports from the Burner Plate (Figure 7-4a).
6. Disconnect the cable from the Pilot Burner by pulling straight out.
7. Using a 1/2” open-end wrench, disconnect the Pilot gas line from the reducer fitting and
elbow shown in Figure 7-1.
8. First, remove the reducer fitting and then the elbow from the Pilot Burner.
9. Next, loosen and remove the Pilot Burner from the Burner Plate using a 1-1/2" open-end
wrench.
10. Remove the blower support turn-buckle (Figure 7-4A).
WARNING