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Cathedral Ceilings Round
Support (RDS) & Square Sup-
port (SQS)
If your home has a cathedral ceiling (no attic space
between the ceiling and the roof), install the chimney
and support as follows.
1) Situate the chimney in a convenient location as
near as possible to the appliance outlet. Cut
and frame a hole in the roof for the support.
The sides of this hole must be vertical with 1
1/4" clearance.
2) Place the support in the opening. Lower it to
the correct height as determined by the table
and diagram below.
Slope
0/12
- 2/12
2/12
- 7/12
7/12
- 12/12
12/12 - 24/12
24/12+
Using a level, make sure the support is vertical.
If the support extends above the roof, cut it
flush with the top of the roof. Nail the support
to the frame opening using (8) 3" spiral nails
or #8 x 1-1/2" screws.
Note: If you are using a 6" square support you
may find it difficult to screw it in place
because it is fairly small inside.
Simpson Dura-Vent has provided angle brack-
ets with this support which can be screwed
to the outside of the support box and nailed
to surrounding framing as required. Use a
minimum of four #8 x 1/2" screws per bracket.
In some cases these brackets may need to
be trimmed (e.g.: to fit under a flashing).
Place the Finish Collar around the support
and fasten it to the ceiling using the screws
provided.
3) Use appropriate roof flashing. Place the flash-
ing under the upper shingles and on top of the
lower shingles approximately half of the flashing
should be under the shingles.
Hampton® H15U-NG/LP Direct Vent Freestanding Gas Stove
4) Assemble the desired lengths of Black Pipe and
Elbows necessary to reach from the appliance
adapter up through the support box and flash-
ing to proper height as per Dia. 12, local codes.
Ensure that all pipe and elbow connections are
in their fully twist lock position.
5) Ensure vent is vertical and secure flashing to the
roof with roofing nails. Slide the storm collar
over the pipe section and seal with a mastic.
6) Twist lock the vent cap on to the last section.
Support Extensions - Round
(RDSE) or Square (SQSE)
Steep pitched cathedral ceilings may require the
use of a support extension. This piece fits down
inside the support and can be adjusted to increase
the support's length by up to 22". The extension is
attached to the support using the eight metal screws
provided. Be sure there is at least a 2 inch overlap
where the extension joins the support.
High Elevation
This unit is approved in Canada for altitude to 4500 ft.
(CAN/CGA-2.17-M91). For Natural Gas installations
above 4500 ft. follow current CAN/CGA-B149.1.
Gas Connection
The gas connection is a 3/8" NPT 90
"X"
gas line can be rigid pipe or to make installation
easier, use a listed flexible connector and/or cop-
per tubing if allowed by local codes. Since some
4"
municipalities have additional local codes it is always
5-1/2"
best to consult with your local authorities and the
6-3/4"
CAN/CGA B149 installation codes.
7-1/2"
For USA installations follow local codes and/or the
12-1/2"
current National Fuel Gas Code, ANSI Z223.1.
When using copper or flex connectors use only
approved fittings. Always provide a union so that
gas lines can be easily disconnected for burner
and/or valve servicing. Flare nuts for copper lines
and flex connectors are usually considered to meet
this requirement.
IMPORTANT: ALWAYS CHECK FOR
GAS LEAKS WITH A SOAP AND
WATER SOLUTION OR GAS LEAK
DETECTOR. DO NOT USE OPEN
FLAME FOR LEAK TESTING.
Note: Prior to any pressure testing of the gas
supply piping system that exceeds test
pressures of 1/2 psig, this appliance
must be disconnected from the piping
system. If test pressures equal to or less
than 1/2 psig are used then this appli-
ance must be isolated from the piping
system by closing its individual manual
shut-off valve during the testing.
H15U-NG System Data
For 0 to 4500 feet altitude
Burner Inlet Orifice Sizes:
Max. Input Rating
Min. Input Rating
Supply Pressure
Manifold Pressure
(High)
H15U-LP System Data
elbow. The
o
For 0 to 2000 feet altitude
Burner Inlet Orifice Sizes:
Max. Input Rating
Min. Input Rating
Supply Pressure
Manifold Pressure
(High)
installation
#47
1 8 , 0 0 0 B t u / h
1 2 , 7 0 0 B t u / h
min.5.0" w.c.
3.5"+/- 0.2"w.c.
#55
18,000 Btu/h
15,500 Btu/h
min.12.0" w.c.
10"+/- 0.2" w.c.
33
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