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VII. Venting
D. Design Requirements Unique to Split Vent Systems (continued)
Example: A 399MBH model is to be installed as using Vent Option 34 in a masonry chimney as shown in Figure 7.23. The
following components are used:
Vent:
4" DuraVent Poly-Pro (Rigid) – 4ft
4" DuraVent Poly-Pro Flex – 30ft
Poly-Pro elbows – 2 (one at base of chimney and one above boiler)
DuraVent 4PPS-FK Terminal
Intake:
4" PVC – 6ft
4" PVC Sweep 90 – 2 (one above the boiler and one as an intake terminal)
Vent Equivalent length – First elbow is ignored. The terminal is also ignored. From Table 7.14, the equivalent length of 4"
DuraVent Poly-Pro Flex is 2.0ft. From Table 7.1 the equivalent length of the second 90 elbow is 13ft. The equivalent length
of the vent system is therefore:
4 + 13 + (30 x 2.0) = 77 ft.
Since Vent Option 34 shows a max vent length of 135ft, the planned vent length of OK.
Intake Equivalent length - First elbow and termination elbow are ignored, leaving just the straight pipe. Equivalent length of
the intake system is therefore 6ft. Since this is less than 135ft, the planned intake length is OK.
5. Use of abandoned chimney as vent chase for flexible Stainless Steel Venting Option 39 - Vent Option 39 permits flexible
Stainless Steel venting to be routed to the roof using an abandoned masonry type chimney. In this application, combustions
air is drawn horizontally from a wall terminal. See Figure 7.25a. When using this, observe the following requirements:
• When a masonry chimney containing multiple flues is used as a chase, the flexible stainless vent installation is
permitted through an adjacent UNUSED flue providing local authority having jurisdiction approves such
installation. (Figure 25b)
•
Masonry chimney used as a chase must be structurally sound and in good repair.
•
All venting is stainless steel supplied by the vent manufacturer shown in Table 7.21. The portion of this venting
within the masonry chimney is flexible.
•
When flexible stainless steel is used for combustion product venting, it must be installed at vertical or near
vertical plane. This will insure proper condensate flow back to the boiler. (Figure 7.25a)
WARNING
Asphyxiation Hazard. Flexible polypropylene vent must be installed only in an UNUSED chimney, A chimney
flue is considered UNUSED when it is not being used for any appliance venting. If chimney is a multiple flue
type where one of the multiple flues is being used for an appliance venting, the flexible polypropylene vent
installation is not permitted through any of the adjacent flues.
Asphyxiation Hazard. Flexible stainless steel vent must be installed only in an UNUSED chimney flue. A
chimney flue is considered UNUSED when it is not being used for any appliance venting. If chimney is
a multiple flue type where one of the multiple flues is being used for an appliance venting, the flexible
stainless vent installation is permitted through an adjacent, unused flue providing a local authority having
jurisdiction approves such installation.
Содержание ASPN-320
Страница 11: ...11 107750 01 9 17 IV Locating the Boiler continued Figure 4 1 Minimum Clearances To Combustible Construction ...
Страница 13: ...13 107750 01 9 17 Figure 5 1 Wall Layout Mounting Hole Location V Mounting The Boiler continued ...
Страница 88: ...88 107750 01 9 17 Figure 10 4 Proper Installation of Header Sensor X Wiring continued ...
Страница 89: ...89 107750 01 9 17 Figure 10 5 Internal Wiring Ladder Diagram X Wiring continued ...
Страница 90: ...90 107750 01 9 17 X Wiring continued CONDENSATE FLOAT SWITCH ...
Страница 91: ...91 107750 01 9 17 X Wiring continued Figure 10 6 Internal Wiring Connections Diagram ...
Страница 100: ...100 107750 01 9 17 Operating Instructions XI Start Up and Checkout continued ...
Страница 145: ...145 107750 01 9 17 XV Service Parts continued ...
Страница 147: ...147 107750 01 9 17 XV Service Parts continued All Models ...
Страница 149: ...149 107750 01 9 17 XV Service Parts continued All Models ...
Страница 151: ...151 107750 01 9 17 XV Service Parts continued All models ...
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Страница 160: ...160 107750 01 9 17 U S Boiler Company Inc P O Box 3020 Lancaster PA 17604 1 888 432 8887 www usboiler net ...