Air Filter Cleaning And Replacement; Refractory Replacement - Bmk5000 & 6000 Only - Watts AERCO Benchmark BMK750 Operation And Service Manual

Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 8 – MAINTENANCE

8.9 AIR FILTER CLEANING and REPLACEMENT

The boiler's air filter should be maintained as follows:
Cleaned every 12 months.
Replaced after 24 months if it shows any signs of deterioration. However, if it is still in good
condition, you can order a 24 Month Maintenance kit that includes an air filter cleaning kit
in place of a new filter.
NOTE:
Failure to clean or replace the air filter may affect stable combustion, result in less efficient
operation, and may result in combustion reliability issues.
All 24 Month Maintenance Kits include one of two parts:
•
An Air Filter Cleaning Kit – Appropriate if the filter is intact
•
New Air Filter – Necessary if the filter is deteriorated or damaged
Check Table 8-2b, above, to find the part number of the kit appropriate for your site. Instructions
are included in the TID that accompanies the kit.
REFRACTORY REPLACEMENT – BMK5000 & 6000 ONLY
8.10
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.
WARNING!
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 crystalline silica fibers,
which have been identified as carcinogenic when inhaled.
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 is much a less complicated procedure; removing the front
refractory requires first removing the blower, burner and air/fuel valve assemblies before reaching
the refractory material.
The procedures for removal of the rear refractory and front refractory materials are provided in
the next two Sections below.
OMM-0145_A99 • GF-218 • Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
9/18/2019 Page 135 of 157