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OUTSIDE VENT COVER REMOVAL
The heater is supplied from the factory with a built-in
stackless outside vent for outdoor installation. Remove
the outside vent cover for outdoor shelter installation.
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/NFPA 54 and/or
CSA B149.1, Natural Gas and Propane Installation Codes,
and local codes. Type “B” Double-wall vent connector is rec-
ommended; however single-wall pipe is allowed by the
National Fuel Gas Code in some circumstances. Consult your
local code official for detailed information. Do not use a
draft hood with this heater.
To connect a negative pressure metal gas vent to the
heater, order the appropriate Metal Flue Collar from the
chart below:
1. See Table 3, below, to determine allowable vent sizes
for your heater.
NOTICE: Table 3 is for installations in which the total lat-
eral 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 (U.S.), or the standards CSA
B149.1 and B149.2 (Canada).
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 Flue Collar to the Vent Body. 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 exterior of
the 4" end of the metal Flue Collar. Attach the metal
Flue Collar to the Vent Body using the RTV supplied
with the kit, following the vent manufacturer’s instruc-
tions (included with kit). Do not use a draft hood with
this heater.
3. Attach the vent pipe to the metal Flue Collar with
sheet-metal screws.
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
manufacturer for your system. Follow manufacturer’s
instructions, local code requirements, National Fuel Gas
Code requirements (U.S.) or standards CSA B149.1 and
B149.2 (Canada) carefully during assembly and installa-
tion.
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
(2cm per meter). Install Listed condensate drains at
low points where condensate might collect. Plumb con-
densate drains to a drain through hard piping or high-
temperature tubing such as silicone rubber or EPDM
rubber – do not use vinyl or other low temperature
tubing. Follow drain manufacturer’s installation
instructions.
WARNING
12
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 In Feet (Meters)
Model 200 Model 250 Model 300 Model 400
Vent Size Height min./max. Height min./max. Height min./max. Height min./max.
6 in. 6 ft. (1.8)/100 ft. (30.5) 18 ft. (5.5)/100 ft. (30.5) 30 ft. (9)/100 ft. (30.5) Not Rec.
7 in. 6 ft. (1.8)/100 ft. (30.5) 8 ft. (2.4)/100 ft. (30.5) 10 ft. (3)/100 ft. (30.5) 15 ft. (4.6)/100 ft. (30.5)
8 in. 6 ft. (1.8)/100 ft. (30.5) 6 ft. (1.8)/100 ft. (30.5) 6 ft. (1.8)/100 ft. (30.5) 8 ft. (2.4)/100 ft. (30.5)
9 and 10 in. 6 ft. (1.8)/50 ft. (15.3) 6 ft. (1.8)/50 ft. (15.3) 6 ft. (1.8)/100 ft. (30.5) 6 ft.(1.8)/100 ft. (30.5)
Type B Double Wall Vent With Single Wall Connector In Feet (Meters)
Model 200 Model 250 Model 300 Model 400
Vent Size Height min./max. Height min./max. Height min./max. Height min./max.
6 in. 6 ft. (1.8)/15 ft. (4.6) 6 ft. (1.8)/15 ft. (4.6) Not Rec. Not Rec.
7 in. 6 ft. (1.8)/8 ft. (2.4) 6 ft. (1.8)/8 ft. (2.4) 10 ft. (3)/20 ft. (6) 15 ft. (4.6)/50 ft. (15.3)
8 in. Not Rec. Not Rec. 6 ft. (1.8)/20 ft. (6) 8 ft. (2.4)/20 ft. (6)
9 in. Not Rec. Not Rec. Not Rec. 6 ft. (1.8)/6 ft. (1.8)
10 in. Not Rec. Not Rec. Not Rec. Not Rec.
Metal Flue Collar Part No.
4x6" 77707-0076
4x8" 77707-0077