Detroit Radiant Products DST-60N, Руководство по установке, Страница: 16 / 52

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DST Series
3.0 Installation • Vertical Venting (Category I)
Vertical Venting (Category I)
(60,000 BTU/h Models Only)
An appliance that operates with a non-positive vent static pressure and with a vent gas temperature that
avoids excessive condensate production in the vent is said to be ‘Category I’. The DST series heater is
considered a Category I appliance if the venting system meets all of the following criteria:
• The vent system terminates vertically (up).
• Use only Simpson-Duravent type PVP venting.
• The length of the horizontal portion of the vent run is less than 75% of the vertical rise length. (e.g.- If
the vertical vent height is 10 feet, the horizontal run is less than 7-1/2 feet).
• The vent terminates a minimum of 5 feet above the vent connection on the unit.
• Horizontal venting sections of the vent pipe must be installed with an upward slope from the
appliance at a pitch of 1/4 inch per foot.
For vertical vent termination, the venting must comply with all parts of this section, in addition to the
requirements of the general venting.
Category I (Vertical) venting is venting at a non-positive pressure. A heater vented as a Category I is
considered a fan-assisted appliance and the vent system does not have to be ‘gas tight’. It is
recommended that the venting system is installed with a tee, drip leg, and clean-out cap as shown in
Figure 3.5.
Vent Locations and Clearances:
• Separate air intake duct from vent pipe by a minimum of 4 feet by placing vent pipes higher than
adjacent air intake ducts.
• Utilize a listed type vent termination cap.
• The vent terminal must extend a minimum of 2 feet above the roof.
• Vent caps should be located a minimum of 2 feet away from adjoining structures.
All vertically vented heaters that are Category I must be connected to a chimney or vent complying with
a recognized Standard, or lined masonry (or concrete) chimney with a material acceptable to the
authority having jurisdiction. Venting into an unlined masonry chimney is not permitted. Refer to the
National Fuel Gas Code and page 27 of this manual.
Use a listed vent terminal to reduce down drafts and moisture in the vent.