AERCO BMK 6000 Dual Fuel - Manual (Page 108)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 7 – MAINTENANCE
Page 108 of 219 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0096_0B
03/21/2014
Ph.: 800-526-0288
GF-141
Figure 7-5: Air/Fuel Valve, Blower & Burner Assembly – Exploded View
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.
7.8 REFRACTORY REMOVAL & REPLACEMENT
Low mass, fiber-based material insulates the front and rear end plates of the combustion
chamber. This material has very low thermal conductivity and is not susceptible to thermal shock
conditions that cause failures of hard-faced refractory materials.
In the event that access to the unit’s combustion chamber is required, the preferred method is to
remove the rear refractory first, since it requires fewer and less complicated procedural steps.
However, if the front refractory is removed first, the complete Burner assembly, blower assembly
and air/fuel valve assembly must be removed to access the refractory material.
The procedures for removal of the rear refractory and front refractory materials are provided in
sections 7.8.1 and 7.8.2, respectively.
WARNING
AIR/FUEL
VALVE
O-RING
BLOWER FLANGE
BLOWER
3/8” HEX NUTS/WASHERS (8 EA.)
BURNER GASKET (P/N 81159)
BURNER FLANGE
BURNER GASKET (P/N 81159)
BURNER
BURNER FRONT PLATE