AERCO BMK 6000 - Manual (Page 99)

Benchmark 6000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 7 – MAINTENANCE
OMM-0086_0D AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 99 of 210
GF-133
Ph.: 800-526-0288
03/20/14
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.
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 7-4).
11. Attach a hoist rig, capable of lifting 300 pounds, to the lifting lugs on the blower motor and
fan housing.
12. Remove the two inlet air filters from the galvanized Y-fitting.
13. Loosen and remove the eight (8) 3/8” hex nuts and washers from the Blower Flange where
it is attached to the Burner Plate (see Figure 7-4, sheets 1 & 2).
14. Remove the Blower from the Burner by pulling outward. Be careful not to allow it to swing
and damage other equipment components. Refer to the exploded view in Figure 7-5.
WARNING