DuraVent Type B Troubleshooting guide

MODEL DVR (ROUND) TYPE-B
GAS VENT INSTALLATION
INSTRUCTIONS
MH6357
Read through all of these instructions before beginning your installation.
Failure to install as described in these instructions will void the manufacturer’s
warranty and may have an effect on your homeowner’s insurance and UL
listing status. Keep these instructions for future reference.
REFERENCES
(1) National Fuel Gas Code, also referred to as NFPA 54 and ANSI Z223.1
(2) Simpson Dura-Vent's Sizing Handbook, available from Simpson DuraVent
CONTENTS
REFERENCES .......................................................................................... 1
GENERAL INFORMATION .................................................................. 1
PLANNING ............................................................................................... 2
STEPS FOR TYPICAL INSTALLATION ........................................... 4
BUCKET SUPPORT ................................................................................ 9
COMBINATION TOP ........................................................................... 10
ADJUSTABLE ELBOWS...................................................................... 11
MALE AND FEMALE ADAPTORS .................................................. 12
RELINING MASONRY CHIMNEYS .................................................. 13
MAINTENANCE .................................................................................... 19
GENERAL INFORMATION
Type B Gas Vents are for venting listed Natural Gas or Liquid Propane
Category I appliances only. The appliances listed below typically (but not always)
use Type B vent systems.
Boilers
Furnaces
Water Heaters
Unit Heaters
Room Heaters
Duct Furnaces
Floor Furnaces
Decorative Gas Appliances
Simpson Dura-Vent Type B Vent Systems may be used on other gas-burning
appliances, provided the manufacturer of the appliance states in their installation
instructions that Type B-vent is acceptable. Do not use Type B Vents for Category
1
II, III, or IV gas appliances. Type B Vent shall not be used to vent flue products
from incinerators, combination gas/oil appliances, oil-fired, or wood-burning
appliances. If there is a question about the use of Type B Vents, contact the
appliance manufacturer or Simpson Dura-Vent's Engineering Department for
further information.
PLANNING
1. Appliances. Carefully review the appliance manufacturer's installation
instructions for positioning the unit, any special venting or connector requirements, and verify that it is a Category I appliance or an appliance that requires
the use of Type B gas vent.
HIGH WIND TOP
DuraCap TOP
DOTTED LINES
SHOW POSSIBLE
OFFSET IN ATTIC
SPACE
STORM
COLLAR
FLASHING
SEE TABLE 2
1 INCH MINIMUM
CLEARANCE
(ALL SIDES)
FIRESTOP
SPACER
B-VENT
ENCLOSURE
1 INCH MINIMUM
CLEARANCE
(ALL SIDES)
CEILING SUPPORT
/ FIRESTOP
VENT CONNECTS
TO APPLIANCE
Fig 1
2
2. Placement. The placement of the vent and fittings must
be in accordance with Local
Codes, as well as accepted venting practices. If more than one
appliance is to be connected to
one venting system, the common
vent must be correctly sized. It is
a good idea to make a sketch of the
proposed installation, labelling
the components you will need.
Adjustable Pipe Lengths are
available to make up odd lengths.
Minimize the number of turns and
lateral runs, as the National Fuel
Gas Code places limitations on
these. A 45° turn is preferable to
a 90° turn. The appliance reference material should be consulted
at this time, as well as any Local
Authority having jurisdiction. In
most localities, building permits
are required for any new appliances, or modifications to existing venting systems.
3. Figures 1, 2, & 3
show examples of some
typical residential installations.
CEILING SUPPORT /
FIRESTOP
TOTAL
VENT
HEIGHT
90° ADJUSTABLE
ELBOW
B-VENT TEE
B-VENT
PIPE
WATER HEATER
CONNECTOR RISE
FURNACE
CONNECTOR RISE
INCREASER
4. Clearance to
Combustibles. A 1-inch
clearance (air space) to
combustible materials
must be maintained,
when using Simpson
Dura-Vent Round BVent, regardless of the
pipe diameter.
WATER HEATER
WITH DRAFT HOOD
FAN ASSISTED
FURNACE
LATERAL
5. Combustion Air.
Refer to appliance installation instructions and local building codes to ensure compliance with required volume of combustion air for each appliance installed .
Fig 2
6. Slope. If the venting system contains lateral (horizontal) components, they shall be positioned
so they have an upwards slope away from the appliance of not less than 1/4inch rise per foot of run. (Horizontal vent installed in attics, unconditioned
area, or between floors have further restrictions, please consult your local
building codes for specific limitations.)
7. Termination Area. Examine the area where the vent system will terminate.
The height of the termination above the roof is determined by the roof pitch, and
also it's proximity to adjacent walls or obstructions. Consult Table 2 on page 9
for proper termination height requirements. Vent pipe with 3"-12" diameter
must terminate at least 2 feet higher than an adjacent wall or obstruction, if it
3
is within 8 feet. Vent pipe with 14" or larger diameter must terminate at least
2 feet higher than an adjacent wall or obstruction, if it is within 10 feet.
8. Connector Rise. Plan a minimum of one foot vertical connector rise
coming out of each appliance.
B-VENT WYE
B-VENT USED AS
CONNECTOR
45°/60°
ADJUSTABLE
ELBOW
FURNACE
CONNECTOR RISE
1 INCH MINIMUM
TOTAL
CLEARANCE
VENT
(ALL SIDES)
HEIGHT
WATER HEATER
CONNECTOR RISE
DURA-CONNECT
FLEXIBLE SINGLE
WALL CONNECTOR
WATER HEATER
WITH
DRAFT HOOD
FAN
ASSISTED
FURNACE
LATERAL
Dura-Connect installation
procedures are contained in a
separate instruction, obtainable
from your Dura-Vent Dealer, or
from Simpson Dura-Vent. The
clearance to combustibles for
Dura-Connect is one inch. It
may not be used to pass through
walls or ceilings, nor may it be
placed in attics or crawl spaces.
It may be used wherever single
wall connector pipe is used.
Fig 3
STEPS FOR TYPICAL INSTALLATION
1. Location. Building Code requires the appliance(s) to be located as close
to the vent as possible. After consulting the local codes, appliance installation
instructions and any other applicable reference material determine the optimum
location for the appliance(s).
2. Penetration Point. Locate and mark the center of the penetration point
through the ceiling or the wall. Refer to Step 3 or 4, as appropriate.
3. Ceiling Support. For a ceiling supported system, install the Square
Firestop/Support as shown in Figures 6, 7, and 8. The Firestop Support must
be framed in and the dimensions are shown in Table 1 and shown in Figure 4.
4
Table 1
PIPE SIZE
STOCK NUMBER OF
CEILING SUPPORT
3 INCH
1440
4 INCH
1441
5 INCH
1442
6 INCH
1443
7 INCH
1444
8 INCH
1445
10 INCH
1446
12 INCH
1447
EXISTING
SHEET ROCK
FRAMING MEMBERS
REQUIRED FOR
SUPPORT
Fig 5
Firestop Supports are
currently manufactured for
FRAMED INSIDE
pipe sizes of 3" through 12"
DIMENSIONS (X & Y)
FIG 4
only. Larger sizes may be
7-3/8" X 7-3/8"
locally fabricated from sheet
7-3/8" X 7-3/8"
metal, provided that the
9-1/8" X 9-1/8"
mandatory 1-inch clearance
9-1/8" X 9-1/8"
11-1/8" X 11-1/8"
is maintained, the pipe is
11-1/8" X 11-1/8"
adequately supported, and the
13-1/8" X 13-1/8"
installation is acceptable to
13-1/8" X 13-1/8"
Local Authorities. In
EXISTING
JOISTS
multistory buildings, a Firestop/
Spacer must be provided at every
floor /ceiling level other than the
first floor which requires a support.
4. Wall Thimble. For a throughthe-wall system, install the Wall
Thimble, as shown in Figure 5. The
Wall Thimble is designed to accommodate walls up to 6 inches
Fig 4
thick. If you have thicker walls, a
sleeve extension should be fabricated and attached to the existing
sleeve . Do not fill the air space
between the B-vent Pipe Section
and the Wall Thimble with insulation, although an RTV-type sealant
may be applied around the flange
and nail heads if desired.
5. Pipe Assembly. Sections of
Simpson Dura-Vent round pipe are
joined together by lining up the female end of the locking lug with the
male end slot, pushing them together,
and turning clockwise to twist lock.
Refer to Figure 9. Sheet metal
screws are not needed for 3" through
5
HANGER
STRAPS
CLAMP AND
HARDWARE
HANGER
STRAPS
CEILNG
SUPPORT
Fig 7
NAILS
(4 REQ)
CLAMP
Fig 6
8" diameter pipe. However, if desired, use 1/
4-inch long sheet metal screws for 3" through 8"
diameter pipe. Never penetrate the inner liner
B-VENT
with screws. For 10" through 16" diameter pipe,
PIPE
SECTION
Simpson Dura-Vent recommends using a minimum of (4) 3/8" sheet metal screws per joint, and
a minimum of (6) 3/8" sheet metal screws per
PIPE COLLAR
joint for 18" and larger diameters. Each Pipe
(OPTIONAL)
Section is labelled, and an arrow shows the
direction of the exhaust flow. For ceiling supFig 8
ported installations, place a Pipe Section, or
assembled Pipe Sections, through the hole in the
Square Firestop Support, and tighten the Clamp. The Clamp will rest inside
the Ceiling Support, and prevent the Pipe Sections from dropping down. The
Pipe Section(s) should protrude a minimum of one inch below the ceiling. An
optional Pipe Collar is available for decorative purposes.
6. Connectors. Only Simpson Dura-Vent connectors should be used
between the appliances and the venting system. Some appliances require Type BVent as a complete dedicated system from the flue collar of the appliance to the
termination of the vent to the outside atmosphere. Simpson Dura-Vent’s listed
flexible, single-wall corrugated aluminum connector, called “Dura-Connect” can
6
be used in many applications when a
B-Vent connector is not required.
7. Elbows. When Elbows are required, strap the Pipe Sections and/or
Elbows in place using Wall Straps.
Support the offset so that the weight of
the offsetting pipe is not bearing down on
the elbows, as shown in Figure 10.
STEP 2
STEP 3
8. Tees and Wyes. Tees and Wyes
are used to combine connectors from 2
or more appliances into a common vent
as shown in Figures 2 and 3. A Tee
Fig 9
STEP 1
should be used in a through-the-wall
application, (Figure 11), as they have a removable Tee Cap (available as a
separate item) attached to the bottom. This Tee Cap may be removed in order
to inspect the system, or to clean out debris or collected condensate from the
common vent. Wall Straps should be used to support the vertical pipe as needed
to provide a secure installation. Wall Straps every four feet are recommended.
9. Enclosures. Any portion of the vent which passes through an occupied
area must be enclosed, to prevent accidental damage to the system, as well as
burns. Figure 1 (page 2) shows a
system which passes through an occupied second floor. Simpson DuraFig 10
Vent does not recommend installation
of B-Vent Pipe on the outside wall of
a building, particularly in cold climates. If it is necessary to do this,
WALL
STRAPS
enclose the outside portion of the sysEXISTING
STRUCTURE
tem in a chase, as shown in Figure 11.
1 INCH
It would be wise to consult the Local
MINIMUM
CLEARANCE TO Authority prior to construction. Note
COMBUSTIBLES
AT ALL POINTS that the enclosure requires an access
45/60°
ELBOW
door for inspection and maintenance
purposes.
WALL
STRAP
10. Terminations. Where the Pipe
ELBOW GORES
Sections pass through the roof, a hole
must be cut to provide a minimum
CEILING SUPPORT
7
clearance (air space) of 1 inch
between the Pipe and construction materials. Straight lengths
of pipe are run up above the
roof. (see table 2) A Roof Flashing is placed down over the
pipe, and adjusted so it fits
tightly against the roof, with the
Pipe Section held in a position
maintaining the 1 inch minimum
clearance from combustibles.
The Flashing is then nailed to
the roof. The roofing material
(shingles, asphalt paper, etc.)
should overlap the top edge (uphill side) of the Flashing. A
non-hardening sealant should be
used around the edges of the
flashing base where it meets the
roof, as shown in Figure 12.
Non-hardening sealant is placed
around the joint between the
Flashing and the vertical Pipe
Section and the Storm Collar is
then placed over this joint, to
make a watertight seal. Add
sufficient Pipe Sections to attain the height specified in Table
2. To connect the Top to the
pipe, hold Top by its collar,
slide collar over locking lugs of
pipe, and twist-lock clockwise.
Tops of diameters greater than
16 inches do not twist-lock, but
are affixed with sheet metal
screws.
11. Inspection. This com-
1 INCH
MINIMUM
CLEARANCE
(ALL SIDES)
WALL STRAP
FRAMED
ENCLOSURE
WALL
THIMBLE
WALL STRAP
REMOVABLE
ACCESS DOOR/PANEL
FOR CLEANNG AND
INSPECTION
GAS
APPLIANCE
TEE
TEE CAP
Fig 11
TOPS ARE
INTERCHANGEABLE
HIGH
WIND
TOP
DuraCap
TOP
SEALANT
SEE
TABLE 2
Fig 12
8
STORM
COLLAR
FLASHING
1 INCH
MINIMUM
CLEARANCE
1 INCH
MINIMUM
CLEARANCE
pletes the installation steps.
Conduct a final inspection to
insure that all joints are secure, the system is properly
supported, and is mechanically sound. Especially verify
that the one-inch clearance
to combustibles requirement
has been met, and that adequate combustion air will be
furnished to the appliance.
GAS VENT SYSTEMS USING VENT CAPS LISTED BY UNDERWRITER’S
LABORATORIES MAY TERMINATE IN ACCORDANCE WITH THIS VENT
TERMINATION TABLE
ROOF PITCH
MINIMUM HEIGHT
FEET
METERS
FLAT TO 7/12
1
0.3
OVER 7/12 TO 8/12
1.5
0.46
OVER 8/12 TO 9/12
2
0.61
OVER 9/12 TO 10/12
2.5
0.76
OVER 10/12 TO 11/12
3.25
0.99
OVER 11/12 TO 12/12
4
1.22
OVER 12/12 TO 14/12
5
1.52
OVER 14/12 TO 16/12
6
1.83
OVER 16/12 TO 18/12
7
2.13
OVER 18/12 TO 20/12
7.5
2.29
OVER 20/12 TO 21/12
8
2.44
BUCKET SUPPORT
Table 2
1. Description. The
Bucket Support (shown in Figure 13) is
for properly supporting the B-vent between 16 or 24-inch O.C. joists or
rafters, or for providing a transition fitting
beCONTINUATION
tween
OF B-VENT SYSTEM
DuraConFig 13
B-VENT
nect
Single Wall Connector and the B-vent Pipe
BUCKET SUPPORT
Sections. A maximum of 20 feet of Type B
RAFTER 16 OR
24 INCHES O.C. Gas Vent may be supported. Note that the
NAIL
HERE
Bucket Support must be installed prior to the
sheetrock.
2. Assembly. After you have determined where the B-vent should be located,
assemble the Bucket Support and BrackCEILING
ets. Nail the assembly to the bottom side of
the joist material as shown in Figure 14.
SINGLE-WALL
CONNECTOR
After the Support Bucket is in place, scribe
(DURA-CONNECT)
and cut out a hole in the sheet rock 1/8"
Fig 14
larger than the diameter of the Bucket, and
9
nail into place. Run the Pipe Sections through the hole in the Bucket Support,
connect the Dura-Connect Single Wall Connector, and attach the Clamp so
that it rests inside the Bucket, and will
support the Pipe. Adjust the Pipe to the
desired height and tighten the Clamp.
This will provide a complete engineered support system.
1-1/2 TO 3
INCHES
COMBINATION TOP
1. Description. The Combination
Top, provides an easily installed, safe
and efficient B-Vent Top and Flashing,
as one lightweight unit. The two basic
components and the assembled unit are
shown in Figure 15. The Combination
Top is designed to accommodate roof
pitches from flat to 6/12, and is available for 3" through 6" diameter B-Vent
pipe.
2. Location. Locate the point in the
underside of the roof where the system
is to penetrate, using a plumb bob or
level.
3. Hole. Remove sufficient roofing
material to cut a hole in the roof which
1" MINIMUM
Fig 16
Fig 15
APPLY SEALANT
ALONG TOP, LEFT,
AND RIGHT EDGES,
AND ON NAIL
HEADS
Fig 17
will allow a minimum of 1 inch air
space between the B-Vent and combustible roofing materials.
4. Flashing. Position the Flashing so the hole is directly over the end
of the pipe, as shown in Figure 16.
Run the top edge of the Flashing under
the roof covering, nail as required,
10
AND THEN
FOLD THEM
OVER TO
HOLD CONE
TO FLASHING
RUN TABS ON
FLASHING UP
THRU RAISED
SLOTS ON CONE
Fig 18
and seal with a non-hardening sealant, as shown in Figure 17. Seal all nail
heads.
5. Height. Add sufficient Pipe Sections of B-Vent until the system
terminates 1-1/2" to 3" above the collar of the Flashing as shown in Figure 16.
6. Top Cone. Slip the Top Cone over the Flashing, so the vertical straps
on the Flashing coincide with the slots at the base of the Cone. Slip the straps
up through the slots as shown in
SHEET
Figure 18. Adjust the Top Cone to METAL
SCREW 1/43/8"
a generally vertical position. INCH LONG
Holding the Top Cone in position,
bend the straps down as shown.
7. This completes the
installation. Conduct a final
inspection of the job to insure
proper joints, correct procedures,
DRILL 1/8"
sealed nail heads, etc.
DIAMETER
HOLE. DO NOT
PENETRATE
INNER LINER.
Fig 19
ADJUSTABLE ELBOWS
1. Purpose. This section furnishes supplemental information
concerning Adjustable Elbows, both 90° and 45°/60°.
2. Connections. In addition to twist locking the elbows, the connection may
be further secured by using sheet metal screws at the joint where the male and
female parts overlap, provided that the screws do not penetrate the inner liner
as shown in Figure 19. One screw per joint is normally sufficient. Use #8 Pan
Head sheet metal screws which are no longer
than 1/4 inch. Liberal use of Wall Straps for
additional support is recommended. Do not
allow the weight of the offsetting pipe to bear
down on lower elbow.
3. 90° Elbows. Figure 20. The installer
should apply pressure to the section at the
points indicated by the arrows. This will
prevent the adjacent sections of the elbow
from turning, as the next pipe or fitting is
twist-locked on. This is important, because
once these sections start rotating, the elbow
Fig 20
11
MALE
FEMALE
10°
DISPLACEMENT
Fig 21
does no longer have a 90° angle.
4. 45° Offsets with 90° Elbows.
Figure 21 shows a 90° Adjustable
Elbow being utilized to accomplish a
45° offset. This Elbow is completely
adjustable from 0° to 90°. Please note
that the centers of the upper sections
tend to displace by a slight amount, as
they are rotated. Again, screws (not
longer than 1/4") may be used to
secure the joint. Wall Straps should
also be utilized to enhance the stability of the vent system.
MALE AND FEMALE ADAPTORS
1. Description. The male and female adaptors
enable an installer to connect Simpson Dura-Vent BB-VENT
vent components to an existing Type B gas vent system
ADAPTOR
(FEMALE) manufactured by the following companies: American
Metals Products, Household Mfg, Hart & Cooley Mfg,
Metal Fab, Inc, White Metal Products, Air Jet, Mitchell
Metal Products.
Fig 22
2. Connecting into Existing Competitors System.
To connect into an existing competitors gas venting
system from below, or from the appliance side, connect
B-VENT
ADAPTOR
a Female Adaptor as shown in Figure 22, insuring that
(MALE)
the inner liner of the adaptor is outside the inner liner of
the existing pipe. Push the adaptor as far up as it will go,
and tighten the locking bolt until the connection is snug.
3. Extending an Existing Competitors System.
To continue an existing competitors system up towards
EXISTING
SYSTEM
the termination using Dura-Vent Type B Gas Vent,
Fig 23
connect a Male Adaptor to the last section of the system,
as shown in Figure 23, insuring that the inner liner of the
Adaptor fits smoothly inside the Pipe or fitting below it. Push the Adaptor
down as far as it will go, and tighten the locking bolt until the connection is snug.
EXISTING
SYSTEM
12
RELINING MASONRY
CHIMNEYS FOR USE WITH
GAS APPLIANCES
1. Description. A masonry chimney should be relined with B-Vent
when venting a Category I gas appliance, such as a gas fireplace insert
or freestanding gas stove, or to improve the venting and reduce condensation of existing gas appliances
which are currently venting into the
masonry chimney. These instructions encompass two general configurations: (1) A gas fireplace
situated inside an existing masonry
fireplace (Figure 24) or (2), a free-
GAS RELINING
ASSEMBLY
B-VENT PIPE
SECTIONS
EXISTING
MASONRY
FIREPLACE
AND
CHIMNEY
FLEX
PIPE
GAS
FIREPLACE
Fig 24
B
C
12 INCHES
A
Fig 25
standing gas appliance venting into an existing masonry chimney. (Figure 30)
2. Masonry Inspection. Have the masonry chimney inspected by a qualified chimney sweep or installer to determine it's structural condition. Clean and repair as necessary.
3. Gas Fireplace. Carefully read the
appliance manufacturer's installation instructions. Use the recommended vent size. Do
not reduce the vent size below that of the flue
exit on the appliance. Do not common vent
gas fireplaces.
(a) Measurements. Measure and
record the dimension as shown on Figure 25
(Height "A"). You will need an additional
12" of vent above the masonry chimney. It is
a good idea to allow for a little extra height
13
DRAFT HOOD
CONNECTOR
Fig 26
in your measurements.
(b) Pipe and
Fitting Requirements.
The bottom 5 foot section
of vent will be Flex Pipe
(used to get around the
smoke shelf, and to
connect to the appliance).
The remainder will be
rigid B-Vent Pipe
Sections. For each pipe
Fig 27
joint, subtract 1-1/2 inches.
(c). Connector. Read the appliance manufacturer's instructions for connecting the Flex Pipe to the
appliance. In most cases, a Draft Hood Connector will be required as shown
in Figure 26. If you are not sure, contact the appliance manufacturer for
clarification. Place the appliance out in front of the fireplace area, as shown in
Figure 27, and install the Draft Hood Connector, or other device in accordance
with the appliance instructions. The
APPLY
Flex Pipe Coupling may be able to
NON-HARDENING
SEALANT
GAS RELINING
attach directly to the appliance.
TERMINATION
ASSEMBLY
(d). Flex Pipe Assembly.
Assemble first Rigid Pipe Section
to the Flex Pipe, insuring that the
"UP" arrows are in fact, pointing up.
Push the sections together and twist
MASONRY
ANCHORS
to lock. Screws are not required,
however if you desire to use them,
use #8 sheet metal screws 1/4-inch
long, being careful not to penetrate
the inner liner. Repeat this process
TRIM BASE
TO FIT
for the remainder of the Pipe SecMASONRY
tions, and lower the assembly down
the chimney. Lower it below it's
normal position as shown in Figure
28.
Fig 28
NON-HARDENING
SEALANT
(e). Position and Connect
14
BASE OF GAS
Fireplace. Push the gas fireplace towards the
MASONRY
RELINING
ANCHORS
TERMINATION
firebox, and connect the Flex Pipe female couASSEMBLY
TRIMMED AND
pling to the appliance, or to the appropriate
SHAPED TO
FIT MASONRY AND
connector as specified by the appliance manuFLUE TILE
facturer. If insufficient space is available between the top of the appliance, and the fireplace
APPLY NONHARDENING
opening, an access opening in the opposite side
SEALANT AROUND
THESE SURFACES
of the masonry chimney may be necessary.
Position the gas appliance on it's final location,
again complying with the manufacturer's inFig 29
structions in regards to location. Install any
shields or covers at this time.
(f). Adjust Height. Go to the top of the chimney and pull the vent system
up to its desired height. In most cases, this will be 12 inches above the masonry
surface. Make a mark on the Pipe Section even with the top of the masonry
surface. If the top of the pipe is near a steep roof (more than 7/12 pitch) ,use
the height as stated in Table 2.
(g). Termination Assembly. Trim the Base Plate of the Termination
Assembly to cover the masonry opening. Refer to Figures 28 and 29. Slip the
Base down over the protruding Pipe Section. Use masonry anchors and nonhardening sealant to secure the Base to the masonry.
(h). Clamp. Pull the Pipe up through the Base to the mark, which you
previously made. Slip the Clamp down to the mark, and tighten it securely to the
Pipe. The Clamp will then support the entire venting system. Slip the Storm Collar
down over the Pipe Section, and seal the joint with a non-hardening sealant.
(i). Top. Install the Top, as shown in Figure 28. This concludes the
procedures for installing a gas fireplace in an existing masonry fireplace. Conduct
a final inspection of the system, and verify that the manufacturer's installation
instructions have been totally complied with.
2. Gas Appliance Venting Into the Side Wall of a Masonry Chimney.
(a). Locate Appliance. Set the appliance in it's desired position, and
mark the center of the hole where the lateral Pipe Section is to pierce the
masonry chimney. Insure the manufacturer's requirements are complied with,
particularly in regards to distances from combustible surfaces. Refer to Figure
30.
(b). Hole in Masonry. Move the appliance aside, and break out the
masonry, forming a hole large enough for the Pipe Section to get through, and also
15
large enough to reach through and hold the Tee, while connecting the horizontal
Pipe Section. An alternate procedure is to make the hole only large enough for
the Pipe Section to pass through, and construct an access gate on the other side
of the masonry chimney. Do not mortar to the pipe.
.
(c). Tee. A Tee is installed at the bottom end of the assembled vertical
Pipe Sections, as shown in Figure 30. The Tee has a removable Tee Cap at
the bottom, for cleaning and condensate removal. If the configuration of the
building permits it, a clean-out access gate is recommended.
(d). Vertical Pipe Sections. Run the assembled vertical Pipe Sections
(with the Tee attached to the bottom), down the chimney, until the horizontal
branch of the Tee is opposite the hole in the masonry.
(e). Adjust Height. Hold the assembled Pipe Sections in this position,
and make a mark even with the top surface of the masonry chimney. The vertical
Pipe Sections should protrude 12 inches (in most cases) above this mark. If
the top of the pipe will be near a steep roof (more than 7/12 pitch), use the height
as stated in Table 2.
(f). Termination Assembly. Trim the Base Plate of the Termination
Assembly to cover the masonry opening. Refer to Figures 28 and 29. Slip the
Base down over the protruding Pipe Section. If necessary, use masonry
anchors and non-hardening sealant to secure the Base to the masonry or bend
base to secure.
(g). Clamp. Pull the Pipe up
GAS RELINING
TERMINATION
through the Base to the mark, which you
ASSEMBLY
made previously. Slip the Clamp down
to the mark, and tighten it securely to the
Pipe. The Clamp will then support the
entire venting system. Slip the Storm
Collar down over the Pipe Section,
and seal the joint with a non-hardening
TRIM COLLAR
TEE
high temperature RTV.
(h). Horizontal Pipe
Section(s). Run the horizontal Pipe
DRAFT HOOD
CONNECTOR
Section(s) through the hole in the
(IF REQUIRED)
masonry, and connect it firmly to the
GAS
APPLIANCE
Tee, either by reaching through the
hole, and holding the Tee while twisting
Fig 30
the Pipe Section, or by holding the Tee
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through the access door while someone twist-locks the Pipe Section to it. Use
an Adjustable Pipe Length as needed to obtain a specific location for the
appliance. Make a mark on the horizontal Pipe Section flush with the vertical
face of the masonry, for referencing the vertical position. Slip a Pipe Collar
over the horizontal Pipe Section and install the remaining fittings as shown in
Figure 30. A minimum of 12 inches of connector rise is required.
(i). Insulation. Pull the Pipe Collar towards the 90° Elbow. Fill in the
gap between the masonry and the horizontal
Pipe Section with ceramic fiber insulation
or fiberglass, as shown in Figure 31. If
CERAMIC
FIBER
fiberglass is used, remove any paper
INSULATION
backing. The filling may be faced off with
grout, if desired. Push the Pipe Collar
back flush with the masonry. Make any
final adjustments on the Adjustable
Fig 31
Length Pipe (if used), and tighten the
clamping bolts.
TROUBLESHOOTING
1. Purpose. This section is intended as a general maintenance and
troubleshooting guide, and as such, cannot encompass all configurations or vent
designs. For problems encountered which are beyond the scope of this sheet,
contact your Dura-Vent Dealer, Distributor, or Simpson Dura-Vent's Engineering
Department. It is imperative that the one-inch clearance (air space) defined
in these instructions be maintained. In most cases, a one-inch minimum
clearance must be maintained to combustibles. The only exceptions are 4-inch, 5inch and 6-inch Oval B-vent which are installed within stud walls. Oval B-vent
and BW Vent are the subject of a separate installation instruction, and are not
discussed here. In these cases, the clearances are established by the listed Firestop
Spacers described in the instructions for Oval B-Vent.
2. Appliance. Read the appliance installation instructions carefully, insuring
that the prescribed clearances are met, and that it is a Category I appliance.
3. Spillage. Spillage from an appliance draft hood may cause condensation
on windows, or odors that the occupant may notice. Spillage may be caused
by an incorrectly sized vent system, blockage of the vent system, or a downdraft
in the vent. Other causes are: excessive lateral runs, too many elbows, improper
pitch to lateral runs (1/4 inch per foot of run is correct), fans or ventilation
systems in the same general area as the gas appliance, or wind conditions at the
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vent cap.
4. Blockage. Check the system for blockage by removing the cap, and
looking down into the vent with a flashlight. Check for bird nests, debris,
rodents, insects, or other obstructions. If nothing is found, inspect the entire
system for physical damage.
5. Downdraft. Downdrafts are generally caused by the system's termination
being too close to an adjacent wall, parapet, or other structure. If the cap is within
eight feet of such an obstruction, it must also be at least two feet above it. Also insure
that the top is at the height prescribed for your roof pitch in Table 2. Inadequate
combustion air is also a major cause of downdraft problems. Appliances like
clothes dryers or other exhausting appliances in the same utility room can cause
downdraft problems.
6. Condensate/Corrosion. Continuous condensate can cause corrosion
(rusting) of vents, tops, appliance draft hoods, and other components of the system,
as well as the inside of the appliance. This situation can be extremely
dangerous, and corrective action must be taken immediately. Common
causes of corrosion are listed below: If in doubt call a professional to inspect the
vent.
(a) If the vent system is located in an area where spray cans or solvents are
used extensively, (laundry areas, or paint shops, for example), the halogenated
compounds get into the combustion air. When they are burned, they form
compounds that cause corrosion. The corrective action in this case, is to isolate the
appliance, and get the air supply from outside, or an uncontaminated area.
(b) Condensate may be caused by incorrect sizing of the vent system.
Follow the procedures in the various sizing publications to obtain the correct sizes
for connectors and vents. Other causes are: excessive lateral runs, too many
elbows, cold attics and crawl spaces, and large areas of the exterior portions of the
venting system exposed to cold weather. As a general rule, laterals should be held
to a minimum, and be no longer than 75% of the vertical height of the system.
Condensate may initially appear as beads on the outside of the connector or vent.
7. Construction. Laterals, offsets, and vertical components should be
securely supported with wall straps, as previously described. Components of
the vent which are in occupied areas should be enclosed to prevent accidental
contact and damage to the vent system. Insure that insulation, building materials,
or debris do not extend into the required clearance spaces. In cold climates,
the exterior portions of the vent should be enclosed in a chase. Outside portions
of the vent system with may be painted with high temperature paint to help
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prevent rusting and corrosion on the exterior surfaces.
MAINTENANCE
1. An annual inspection is required to maintain warranty of your
Simpson Dura-Vent B-Vent system. You will need to inspect the Cap, Vent
Pipe, Connector Pipe, and the connection to the appliance.
2. Verify that the sealant around the Flashing and Storm Collar is intact.
Reseal as needed. Remove Cap. Hold Cap by the collar only, and unlock by
twisting counterclockwise, and then pull up. Grabbing the Cap by the outer
edge or top can cause damage to the Cap.
3. Inspect Cap for any physical damage or damage from corrosion.
Look for any foreign material inside the cap or vent. (Example: bird's nest,
leaves, etc.)
4. Shine a light down inside of the vent pipe. Look for any evidence of
damage, corrosion or excessive condensation. Also, look for any disconnected
sections of the vent pipe or connector pipe. Refer to the installation instructions
to reconnect pipe sections. If pipe sections are damaged or corroded, replace
immediately!
5. Replace Cap by grabbing cap (by collar only), and slide onto pipe
section and twist-locking (clockwise).
6. Inspect appliance connector and make sure that the vent is securely
connected to the appliance.
7. Damaged or corroded parts should be replaced immediately!
Failure to do so can lead to an extremely hazardous situation!
8. Follow your appliance manufacturer's recommended instructions for
inspection your appliance.
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Simpson Dura-Vent offers the industry’s only twenty-five year warranty on Type B gas vent
system and is UL listed. This warranty is in effect from the date of installation and includes
all components and fittings. Simpson Dura-Vent warrants the following products: All Fuel
Class A Chimney - Dura/Plus® and Dura-Chimney®; Close Clearance Connector Pipe - DVL®;
Type B Gas Vent and Pellet Vent® Chimney for a period of twenty-five years from date of
installation. Warranty includes all component fittings, except rain caps, which is covered for
five years from date of installation. Direct Vent GS® is warranted for ten years from the date
of installation. Dura/Connect® is UL listed, approved by ICBO, BOCA and SBCCI and is
warranted for ten years from the date of installation. DuraFlex® pipe and fittings is UL and
ULC listed and is warranted for ten years from the date of installation. Warranty includes
component fittings, except cap assembly which is covered for five years from date of
installation. Dura-Black® drip free stovepipe is warranted for five years from the date of
installation. Dura/Liner® is UL and ULC listed and is warranted for twenty-five years from the
date of installation. All warranties, whether expressed or implied, shall be limited to replacement
(exclusive of installation costs) of our product found to be defective under its warranty and
shall be conditional upon compliance with the manufacturer’s recommended installation and
maintenance procedures and intended use of the product, and providing all recommended
installation and maintenance instructions are followed. All products must be maintained by
periodic inspection and cleaning as needed, including chimney exposed to weather containing
corrosive elements or contaminated intake air, due to storage of corrosive agents near the
appliance. Always refer to warranty specifics for each product line.
SIMPSON Dura-Vent Co., Inc. All Rights Reserved, 1998
SIMPSON
DURA-VENT, INC
PO Box 1510
Vacaville, CA
95688-1510
(800)-835-4429
(707)-446-4740 (FAX)
April 2000
L204A
Vicksburg, MS
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