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Benchmark 750-3000 Boiler Operation & Maintenance Manual
SECTION 4 – MAINTENANCE
Air Filter Cleaning and Replacement Instructions
5. The filter may be cleaned in hot soapy water to remove oil and dirt. It should then be
thoroughly dried and then sprayed with a light coating of K&N® Air Filter Oil (or equivalent
specifically formulated for air filters) prior to reinstallation. Do NOT use WD-40.
6. Each replacement air filter is equipped with its own clamp. Therefore, simply install the
replacement air filter on inlet flange of the air fuel valve and tighten the clamp with a flat-tip
screwdriver or 5/16" nut driver.
7.
Replace the top shroud on the unit and return boiler to service use.
4.9 WATER CUTOFF (LWCO) CAPACITOR INTEGRITY TEST
The LWCO capacitor (FRU Kit P/N 69126) should be tested for electrical shorts every 12
months and replaced, then tested, every 24 months. The LWCO capacitor integrity test
consists of two parts as described in the next two sections. The first procedure explains
how to test for electrical shorting of the LWCO probe capacitor, while the second procedure
instructs how to perform the standard Low Water Cutoff test using the C-More Controller.
Refer to Figure 4-9 for an illustration of the LWCO probe assembly and its typical installation.
Rear
Panel
Hot Water
Outlet Pipe
Figure 4-9: LWCO Probe Location (BMK1500 Shown)
OMM-0122_D • GF-206 • 5/9/2019
LWCO Probe
Terminal
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
LWCO Probe
Plastic Acorn Nut
Capacitor Assembly
(Covered By Large
Shrink Tubing)
Connector
(to Shell Harness)
Page 55 of 164
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