VERTICAL VENTING - NEGATIVE PRESSURE
(See Figures 11 and 12)
Vent the heater vertically in a negative pressure (positive draft) system in accordance with the National Fuel Gas Code, ANSI Z223.1, and local codes. Type “B” Double- wall vent connector is recommended; however
To connect a negative pressure metal gas vent to the heater, order the appropriate Metal Flue Collar from the chart below:
Metal Flue Collar |
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4x6”77707-0076
4x8”77707-0077
1.See Table 3, below, to determine allowable vent sizes for your heater.
NOTICE: Table 3 is for installations in which the total later- al vent length (that is, the horizontal distance from the flue collar to the main vertical portion of the vent) is less than 1/2 the total vent height (the vertical distance from the flue collar to the vent termination) and which have three or less elbows in the system. For venting systems which do not meet these conditions, consult the National Fuel Gas Code, ANSI Z223.1
2.Install the metal Flue Collar in the Vent Body of the heater (located under the outside vent cover). Fasten the metal Flue Collar to the Vent Body with two #10 sheet metal screws. Use UltraCopper® silicone RTV to seal the metal Flue Collar to the Vent Body. Follow instructions supplied with the metal Flue Collar. Before connecting the metal Flue Collar to the Vent Body, wet a clean cloth or paper towel with isopropyl alcohol (rubbing alcohol) and vigorously wipe the socket of the Vent Body. Immediately wipe the cleaned surfaces dry with a clean cloth or paper towel. Repeat for the exte-
rior of the 4” end of the metal Flue Collar. Attach the metal Flue Collar to the Vent Body using the RTV sup- plied with the kit, following the instructions included with kit. Do not use a draft hood with this heater.
3.Attach the vent pipe to the metal Flue Collar with
Risk of fire or asphyxiation if vent is not assembled according to manufacturer’s instructions or if vent parts from different manufacturers are mixed. Vent parts from different manufacturers ARE NOT interchange- able. Mixing parts from more than one manufacturer may cause leaks or damage to vent. When assembling a vent, pick one manufacturer and be sure that all vent parts come from that manufacturer and are specified by the manufac- turer for your system. Follow manufacturer’s instructions and local and National Fuel Gas Code requirements care- fully during assembly and installation.
4.Install vent pipe so that it can expand and contract freely as the temperature changes. Support the vent pipe according to applicable codes and the vent manu- facturer’s instructions. Pipe support must allow the vent pipe free movement out and back, from side to side, or up and down as necessary, without putting a strain on the heater or vent body. Slope horizontal pipe runs up from the heater at least 1/4” per foot. Install Listed condensate drains at low points where conden- sate might collect. Plumb condensate drains to a drain through hard piping or
5.Use Listed firestops for floor and ceiling penetrations. Use Listed thimble for wall penetrations. Use a Listed roof flashing, roof jack, or roof thimble for all roof pen- etrations. Do not fill the space around the vent (that is, the clear air space in the thimble or firestop) with insulation. The roof opening must be located so that the vent is vertical.
Table 3: Permitted Minimum and Maximum Vent Heights By Size and Heater Model
Read “VERTICAL VENTING – NEGATIVE PRESSURE” (above) before using this table.
| Type B Double Wall Vent With Type B Double Wall Connector |
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| Model 200 | Model 333 | Model 400 | |||
Vent Size | Min. Height | Max. Height | Min. Height | Max. Height | Min. Height | Max. Height |
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6 in. | 6 Ft. | 100 Ft. | 30 Ft. | 100 Ft. | Not Rec. | Not Rec. |
7 in. | 6 Ft. | 100 Ft. | 10 Ft. | 100 Ft. | 15 Ft. | 100 Ft. |
8 in. | 6 Ft. | 100 Ft. | 6 Ft. | 100 Ft. | 8 Ft. | 100 Ft. |
9 and 10 in. | 6 Ft. | 50 Ft. | 6 Ft. | 100 Ft. | 6 Ft. | 100 Ft. |
| Type B Double Wall Vent With Single Wall Connector |
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| Model 200 | Model 333 | Model 400 | |||
Vent Size | Min. Height | Max. Height | Min. Height | Max. Height | Min. Height | Max. Height |
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6 in. | 6 Ft. | 15 Ft. | Not Rec. | Not Rec. | Not Rec. | Not Rec. |
7 in. | 6 Ft. | 8 Ft. | 10 Ft. | 20 Ft. | 15 Ft. | 50 Ft. |
8 in. | Not Rec. | Not Rec. | 6 Ft. | 20 Ft. | 8 Ft. | 20 Ft. |
9 in. | Not Rec. | Not Rec. | Not Rec. | Not Rec. | 6 Ft. | 6 Ft. |
10 in. | Not Rec. | Not Rec. | Not Rec. | Not Rec. | Not Rec. | Not Rec. |
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