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When retrofitting a pilot with a high quality Coen Pilot, there are a
number of considerations to keep in mind. Some issues of pilot retrofits are explained below.
Heat Input
The pilot's job is to safely light the main burner.
To accomplish this task, Coen recommends that the pilot be sized at 2.5 % of the main burner capacity at light-off. For example, a 100,000,000
Btu/hr burner would normally be lit off at 20 % of high fire, or at 20,000,000
Btu/hr. Thus, the pilot would be sized for 500,00 Btu/hr capacity.
A pilot can be correctly sized by knowing either boiler
maximum output, maximum burner heat input, or burner light-off heat input.
Pilot Length
When retrofitting it is critical to maintain an appropriate
position for the pilot in order to ensure safe light-off. Typically,
the existing pilot length serves as an accurate measurement for the new
pilot. For retrofitting, Coen will require a measurement of the
distance from the mounting plate to the tip of the existing pilot.
Pilot Mounting
Pilot mounting plates vary. As such, it is important to know both
the bolt pitch circle and bolt hole pattern of the existing pilot.
For a nominal fee, Coen is capable of custom designing a mounting configuration
for your new Coen pilot. However, pilot pricing is less if the burner
front is modified to allow a standard Coen mounting pattern. Additionally,
the pilot hole cutout is critical for retrofitting. The Coen pilot
head and spark rod must be capable of fitting through the existing cutout
on the burner front.
A variety of Coen pilots can be effectively utilized on a variety of
applications. Please contact the Coen
Maintenance Parts Department for advice on the correct selection for
your particular application.
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