Condensation; Mechanical Draft Applications - PENSOTTI DK2-3 User Manual

A 6in. diameter flue pipe must be used for connection of the boiler flue outlet to the chimney for
the entire length of the connection. An exception can be made for the three, four, and five section
boilers where the flue pipe may be reduced to 5in. for the length of the connection. The chimney
connector should be at least 24 gauge metal, be properly supported, and be free of as many 90
degree turns as possible. The distance between the boiler and the chimney depends on whether or
not elbows are used. The distance should be at least 24in. if no elbows are used and 12in. if elbows
are used. The same holds true for the maximum length of the flue pipe. It must be no longer than
10ft. if no elbows are used and 6ft. if elbows are used.
The height of the chimney should be within the following parameters:
- The top of the chimney should be at least 32 inches above the ridge of the roof.
- The flue pipe should be placed at a rising slope of 15 degrees with all parts of the flue subject
to cold being insulated.
- The flue pipe must be properly supported and be 18in. from all combustible surfaces.

Condensation

The Quatech Series boiler is a high efficiency boiler and as a result improper venting can lead to
condensing temperatures in the chimney connector and the venting system. If condensing
temperatures of below 250 degrees F NET are reached in the chimney connector then additional
steps to insure proper draft must be taken. Make sure that all joints are properly sealed with a high
temperature silicone or mastic. If after sealing the joints the condition still exists then inspect the
chimney for suitability. If the masonry, brick, block chimney, or tile chimney liner is in poor
condition a new chimney liner rated for oil may have to be installed. In the event the condition still
exists after installation of a new liner consult Pensotti North America.
Roof Clearances
Standard roof clearances apply. The installer is responsible for their adequacy.

Mechanical Draft Applications

The following basic guidelines listed below figure 10 should be followed with mechanical draft
applications. It is also strongly recommended that all precautions for Natural Draft Applications be
followed. Reference should be made to NFPA 211. Refer to figure 10 below as a reference.
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