Burnham K2WT Residential, Инструкция по установке, эксплуатации и обслуживанию

Страница: 18 / 168

18
107672-03 - 5/18
VII. Venting
A. Vent System Design (continued)
7. Supporting Pipe - Vertical and horizontal sections of pipe must be properly supported. Maximum support
spacing is as follows:
• Support CPVC/PVC horizontally and vertically every 4 feet.
• Support DuraVent PolyPro horizontally near the female end of each straight section of pipe and vertically
every 10 feet.
• Support Centrotherm InnoFlue horizontally every 39 inches with additional supports at elbows and vertically
every 78”.
• Support 2” Selkirk Polyflue horizontally every 30”. Support 3” Polyflue horizontally every 39”. Support vertical
runs of both 2” and 3” Polyflue every 16 ft.
• Support DuraVent FasNSeal horizontally every 6ft or less. Support vertical runs at the base and every 12ft or
less.
The instructions for the installation of the venting system shall specify that the horizontal portions of the venting
system shall be supported to prevent sagging; the methods of and intervals for support shall be specified.
These instructions shall also specify that the venting system:
• For Category II and IV boilers, be installed so as to prevent accumulation of condensate; and
• For Category II and IV boilers, where necessary, have means provided for drainage of condensate.

Les instructions d´installation du système d´évacuation doivent préciser que les sections horizontales doivent
être supportées pour prévenir le fléchissement. Les méthodes et les intervalles de support doivent être
spécifiés. Les instructions divent aussi indiquer les renseignements suivants:
• les chaudières de catégories II et IV doivent être installées de façon à empêcher l´accumulation de
condensat: et
• si nécessaire, les chaudières de catégories II et IV doivent être pourvues de dispositifs d´évacuation du
condensat.
8. Allowing for Thermal Expansion -
• For CPVC/PVC pipe design, the vent system shall allow 3/8” of thermal expansion for every 10ft of CPVC/
PVC pipe. The boiler will always act as an anchor to one end of the vent system. If at all possible, select and
install hangers and wall thimbles so that the vent system can expand towards the terminal. When a straight
run of pipe exceeds 20ft and must be restrained at both ends, an offset or expansion loop must be provided
(Figures 7.3a, 7.3b). When a straight horizontal run of pipe exceeds 20ft and is restrained at one end with
an elbow at the other, avoid putting a hanger or guide less than “Y” inches from the elbow in the adjoining
straight section (Figure 7.3c). Thermal expansion fittings are not permitted.
• When properly assembled expansion of PolyPro, Polyflue and InnoFlue vent systems is accommodated at the
joints. See Section VII - F, G & H of this manual for details.
• Stainless steel vent systems must be free to expand and contract in accordance with manufacturer’s
installation instructions.
9. Running PVC Vent Pipe Inside Enclosures and Through Walls - PVC vent pipe must be installed in a manner that
permits adequate air circulation around the outside of the pipe:
• Do not enclose PVC venting - Use CPVC in enclosed spaces, even if PVC is installed upstream.
• PVC venting may not be used to penetrate combustible or non-combustible walls unless all of the following
conditions are met:
a. The wall penetration is at least 66 inches from the boiler as measured along the vent.
b. The wall is 12” thick or less
c. An airspace of at least that shown in Figure 7.4 is maintained around the OD of the vent.
If any of these conditions cannot be met, use CPVC for the wall penetration.
10. Vent Manufacturer’s Instructions – The vent system manufacturer may have additional vent system design
requirements. Read and follow the vent manufacturer’s instructions in addition to those shown here. Where a
conflict arises between the two sets of instructions, the more restrictive requirements shall govern.