The SL280UHV series units are classified as fan−assisted Category I furnaces when vertically vented according to the latest edition of National Fuel Gas Code (NFPA 54 / ANSI Z223.1) in the USA. A fan−assisted Category I fur- nace is an appliance equipped with an integral mechanical means to either draw or force combustion products through the combustion chamber and/or heat exchanger. The SL280UHV is not approved for use with horizontal venting..
NOTE − Use these instructions as a guide. They do not su- persede local codes. This furnace must be vented accord- ing to all local codes these installation instructions, and the provided venting tables in these instructions
The venting tables in this manual were extracted from the National Fuel Gas Code (NFPA 54 / ANSI Z223.1) and are provided as a guide for proper vent installation. Proper ap- plication, termination, construction and location of vents must conform to local codes having jurisdiction. In the ab- sence of local codes, the NFGC serves as the defining doc- ument.
Refer to the tables and the venting information contained in these instructions to properly size and install the venting system.
IMPORTANT
Once the venting system is installed, attach the connected Vent" warning sticker to a visible area of the plenum near the vent pipe. See figure 22. The warning sticker is provided in the bag assembly. Or- der kit 66W04 for additional stickers.
Use self−drilling sheet metal screws or a mechanical fas- tener to firmly secure the vent pipe to the round collar of the flue transition. If self−drilling screws are used to attach the vent pipe, it is recommended that three be used. Drive one self−drilling screw through the front and one through each side of the vent pipe and collar. See figures 19, 21 and 22.
Install the first vent connector elbow at a minimum of six inches (152 mm) from the furnace vent outlet. See figure 22.
Venting Using a Masonry Chimney
The following additional requirements apply when a lined masonry chimney is used to vent this furnace.
Masonry chimneys used to vent Category I central fur- naces must be either
A chimney with one or more sides exposed to the outside of the structure is considered to be an exterior chimney.
An exterior masonry chimney that is not tile−lined must be lined with B1 vent or a listed insulated flexible metal vent. An exterior tile−lined chimney that is sealed and capped may be lined with a listed uninsulated flexible metal vent.
If the existing chimney will not accommodate a listed metal liner, either the chimney must be rebuilt to accommodate one of these liners or an alternate approved venting meth- od must be found.
Insulation for the flexible vent pipe must be an encapsu- lated fiberglass sleeve recommended by the flexible vent pipe manufacturer. See figure 23.
WARNING
Asphyxiation hazard. The exhaust vent for this fur- nace must be securely connected to the furnace flue transition at all times.
VENT CONNECTION | “DISCONNECTED VENT” |
| |
| WARNING |
| STICKER |
VENT PIPE |
|
(min. 6" length) |
|
FLUE TRANSITION |
|
COLLAR |
|
FIGURE 22
Common Venting Using Metal−Lined Masonry Chimney
|
| SEALED | |
| MAX. LENGTH |
| |
| −− SEE NOTE 1 |
| |
5 ft. (1.5 m) | BELOW. |
| |
MIN. LENGTH −− AS |
| ||
minimum | EXTERIOR | ||
SHORT AS PRACTICAL | |||
| CHIMNEY WITH | ||
|
| ||
|
| METAL | |
|
| LINER | |
VENT CONNECTOR |
| ||
4 in. (102 mm) |
|
| |
minimum |
|
| |
| FURNACE |
| |
OTHER |
|
| |
APPLIANCE |
| ||
|
| PERMANENTLY | |
|
| SEALED FIREPLACE | |
|
| OPENING | |
| AIR FLOW |
| |
NOTE 1 − Refer to the provided venting tables for installations. Refer to the capacity requirements shown in the provided venting tables.
FIGURE 23
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