Weil-McLain Ultra Electric Water Heater Installation and operating instructions

This addendum must only be used by a qualified heating installer/service technician. Read all instructions, including
the Ultra boiler manual and all other information shipped with the boiler, before installing. Perform steps in the order
given. Failure to comply could result in severe personal injury, death or substantial property damage.
Manual addendum — Venting
Gas-fired water boilers – Series 3
Featuring
Flexibility
Part number 550-100-103/1110
®
Contents
Venting & air — general. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Sidewall vent/air termination: 3” or 4” concentric . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Vertical vent/air termination: 3” or 4” concentric . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Concentric vent/air termination assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
DIRECT VENT: Vertical vent / sidewall air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Install vent/air piping — boiler to termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
DIRECT EXHAUST venting — general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
DIRECT EXHAUST — Boiler room air openings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
DIRECT EXHAUST — Sidewall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
DIRECT EXHAUST — Vertical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Supplementary instructions for:
Additional concentric vent/air termination kits, includings
IPEX System 636 in 3-inch and 4-inch sizes
(for information on IPEX, go to www.ipexinc.com)
Direct exhaust ventings (requires combustion air openings to boiler
room/building per this addendum).
Direct vent withs Roof exhaust and Sidewall air intake

Part number 550-100-103/1110
GAS-FIRED WATER BOILER — Manual addendum — Venting
A–2
Corrosive contaminants and sourcesFigure 1
Products to avoid
Spray cans containing chloro/fluorocarbons
Permanent wave solutions
Chlorinated waxes/cleaners
Chlorine-based swimming pool chemicals
Calcium chloride used for thawing
Sodium chloride used for water softening
Refrigerant leaks
Paint or varnish removers
Hydrochloric acid/muriatic acid
Cements and glues
Antistatic fabric softeners used in clothes dryers
Chlorine-type bleaches, detergents, and cleaning
solvents found in household laundry rooms
Adhesives used to fasten building products and other
similar products
Excessive dust and dirt
Areas likely to have contaminants
Dry cleaning/laundry areas and establishments
Swimming pools
Metal fabrication plants
Beauty shops
Refrigeration repair shops
Photo processing plants
Auto body shops
Plastic manufacturing plants
Furniture refinishing areas and establishments
New building construction
Remodeling areas
Garages with workshops
Venting & air — general
Do not install the Ultra boiler into a common vent with
any other appliance. This will cause flue gas spillage or ap-
pliance malfunction, resulting in possible severe personal
injury, death or substantial property damage.
Existing common vent systems may be too large for the
appliances remaining connected after the existing boiler
is removed.
Failure to follow all instructions can result in flue gas
spillage and carbon monoxide emissions, causing severe
personal injury or death.
When removing a boiler from an existing
common vent system
The Ultra boiler cannot be common vented with any other appli-
ance. When an existing boiler is replaced with an Ultra boiler, the Ultra
boiler CANNOT use the existing common vent. The Ultra boiler requires
its own vent and air piping, as specified in this manual. This may cause a
problem for the appliances that remain on the old common vent, because
the vent may be too large. The following test is intended to check for proper
operation of the appliances remaining on the old common vent system.
Vent system verification
At the time of removal of an existing boiler, the following steps shall be
followed with each appliance remaining connected to the common venting
system placed in operation, while the other appliances remaining connected
to the common venting system are not in operation. Seal any unused open-
ings in the common venting system.
Existing vent test procedure
(The following is intended to test whether the appliances
remaining on an existing vent system will operate
satisfactorily.)
Visually inspect the venting system for proper size and horizontal pitch1.
and determine there is no blockage or restriction, leakage, corrosion or
other deficiencies which could cause an unsafe condition.
Test vent system — Insofar as is practical, close all building doors and2.
windows and all doors between the space in which the appliances
remaining connected to the common venting system are located and
other spaces of the building. Turn on clothes dryers and any appliance
not connected to the common venting system. Turn on any exhaust
fans, such as range hoods and bathroom exhausts, so they will oper-
ate at maximum speed. Do not operate a summer exhaust fan. Close
fireplace dampers.
Place in operation the appliance being inspected.Follow the lighting in-3.
structions. Adjust thermostat so appliance will operate continuously.
Test for spillage at draft hood relief opening after 5 minutes of main4.
burner operation. Use the flame of a match or candle, or smoke from
a cigarette, cigar, or pipe.
After it has been determined that each appliance remaining connected5.
to the common venting system properly vents when tested as outlined
herein, return doors, windows, exhaust fans, fireplace dampers, and any
other gas-burning appliance to their previous conditions of use.
Any improper operation of common venting system should be corrected
so the installation conforms with the National Fuel Gas Code,ANSI Z223.1
— latest edition. Correct by re-sizing to approach the minimum size as
determined using the appropriate tables in Part 11 of that code. Canadian
installations must comply with B149.1 or B149.2 Installation Code.
REPLACES MANUAL PAGE 16
You must provide combustion air.
Direct vent — Install air inlet piping for the Ultra
boiler as described in the Boiler manual and this ad-
dendum. The air termination fitting must be installed
with the clearances and geometry relative to the vent
outlet depicted in this manual to ensure that flue
products do not enter the air intake.
Direct exhaust — Provide combustion air openings
to boiler room/building as specified in this adden-
dum and as required by all applicable codes.
Ensure that the combustion air will not contain
any of the contaminants in Figure 1. DO NOT
place combustion air supply opening or intake near
a swimming pool, for example. Avoid areas subject
to exhaust fumes from laundry facilities. These areas
will always contain contaminants.
Contaminated combustion air will damage the boiler,
resulting in possible severe personal injury, death or
substantial property damage.

Part number 550-100-103/1110 A–3
GAS-FIRED WATER BOILER — Manual addendum — Venting
Venting & air — general (cont.)
Ultra Boilers must be vented and
supplied with combustion and ven-
tilation air using piping and methods
described in this manual.
Every boiler must have its own vent.
DO NOT common vent with any other
appliance. See page A-2.
Inspect finished vent and air piping
thoroughly to ensure all are airtight and
comply with the instructions provided
and with all requirements of applicable
codes.
Failure to provide a properly-installed
vent and air system will cause severe
personal injury or death.
If the vent/air piping configurations cov-
ered in the Ultra boiler manual and this
addendum cannot be applied for a par-
ticular installation, contact Weil-McLain
for assistance. Other configurations may
be available.
Where vent piping is routed through an
unheated space, apply minimum 1 inch
of foil-faced fiberglass insulation on the
length of the vent pipe in the unheated
space.
Installations must comply with local
requirements and with the National
Fuel Gas Code, ANSI Z223.1 for U.S.
installations or CSA B149.1 or B149.2
for Canadian installations.
Use only the materials listed in the
Boiler manual and this addendum for
vent and air pipe and fittings. See Fig-
ure 5, page A-7. Failure to comply could
result in severe personal injury, death or
substantial property damage.
If used, a masonry chimney can
ONLY be used as a PIPE CHASE for
vent and air pipes — The vent and air
piping must be installed as instructed in
this manual and all joints must be sealed.
The chimney must be used only for Ultra
boilers. NO OTHER appliance or fire-
place can be connected to the chimney.
The chimney must be straight, with no
offsets, and the vent and air piping ma-
terials must comply with this instruction
manual. The chimney must be fitted
with a sealed access opening, through
which the interior of the chimney can
be inspected. The chimney (and liner, if
installed) must be inspected at least once
annually to verify condition.
Failure to comply could result in severe
personal injury, death or substantial
property damage.
Vent piping
Boiler flue gases must be piped from the boiler to outside, follow-1.
ing the instructions in the Boiler manual and this addendum, and
compliant with all applicable codes. The vent pipe must terminate
either through the sidewall or through the roof, located with the
correct separation from the air termination.
See2. Figure 2, page A-4 for location of instructions for the vent/
air system being used.
Each Ultra boiler requires a separate vent.3. Do not common
vent.
Combustion air piping
(direct vent installations)
For direct venting, combustion air must be piped from outside to1.
the boiler, following the instructions in the Boiler manual and this
addendum, and compliant with all applicable codes. Read the
warning in Figure 1, page A-2, and ensure the air intake
will not be likely to draw in contaminated air.
Combustion air can be piped individually for each boiler, or2.
it can be manifolded as shown in Boiler manual, page 55. Air
piping must always terminate on the same side (or roof ) of the
building as the vent, except for direct vent: vertical vent/sidewall
air installations.
Combustion and ventilation air openings
(direct exhaust installations)
Combustion and ventilation air are provided from the boiler room1.
on direct exhaust installations.Follow all instructions in the Boiler
manual and this addendum, plus all applicable codes, to provide
required air openings.
Vent and air pipe termination options
Vent and air piping must terminate out the sidewall or through1.
the roof of the building, using only one of the methods described
in the Boiler manual and this addendum.
See2. Figure 2, page A-4 for options.
Vent and air pipe diameters
Vent and air pipe diameters can be as specified in1. Fig-
ure 2, page A-4.
Vent and air pipe maximum length
Do not exceed vent and air piping MAXIMUM lengths given in1.
Figure 2, page A-4.
Vent and air pipe minimum length
Direct vent — vent pipe and air pipe must each be1. at least 2 feet
long, with 2 elbows if sidewall venting or 1 elbow if vertical vent-
ing.
Direct exhaust — no minimum.2.
REPLACES MANUAL PAGE 17

Part number 550-100-103/1110
GAS-FIRED WATER BOILER — Manual addendum — Venting
A–4
Venting & air — general (cont.)
Figure 2 DIRECT VENT APPLICATIONS — Vent and air termination options
DIRECT VENT
SIDEWALL termination
DIRECT VENT
VERTICAL termination
DIRECT VENT
VERTICAL vent and
SIDEWALL air
Weil-McLain
sidewall
termination
plate
(See Boiler
manual
page 18)
3” or 4”PVC
concentric
termination
(See addendum
page A-8)
Vertical
vent
termination
and
Sidewall
air
termination
(See
addendum
page A-15)
3” or 4” PVC
concentric
termination
(See addendum
page A-8)
Vertical
termination with
separate vent
and
air pipes
(See Boiler
manual
page 73)
Sidewall
termination with
separate vent
and
air pipes
(See Boiler
manual
page 66)
Direct vent
installation
sequence
Install the boiler.Step 1
Determine the termination method — sidewall or vertical, concentric or separate pipes, etc.Step 2
Determine proper location for wall or roof penetration for each termination.Step 3
Install termination assembly as described in this manual.Step 4
Install air and vent piping from boiler to termination.Step 5
Install pipe supports and brackets as required.Step 6

Part number 550-100-103/1110 A–5
GAS-FIRED WATER BOILER — Manual addendum — Venting
Venting & air — general (cont.)
Figure 3 DIRECT EXHAUST APPLICATIONS — Vent termination options (combustion air from room)
DIRECT EXHAUST
Sidewall termination
DIRECT EXHAUST
Vertical termination
Sidewall vent
termination
(See addendum
page A-19)
Vertical vent
termination
(See addendum
page A-19)
Direct
exhaust
installation
sequence
Install the boiler.Step 1
Determine the proper location for roof or wall penetration for each termination.Step 2
Prepare roof penetrations before installing vent piping.s
Finish by attaching external pipe and fittings as shown in the termination instructions.s
Vertical terminations only — Install terminations as described in this addendum.s
Support vertical runs on the outside of the building with brackets as shown in the termination instructions.s
Install vent piping from boiler to termination.Step 3
Install a hanger support within 6 inches of any upturn in the piping.s
Slope horizontal piping downward toward the boiler at least 1/4 inch per foot.s
Connect the vent piping at the boiler per manual instructions.Step 4

Part number 550-100-103/1110
GAS-FIRED WATER BOILER — Manual addendum — Venting
A–6
Venting & air — general (cont.)
Figure 4 Vent and air pipe options and maximum allowable piping lengths
Ultra model
Vent or air
pipe size
t.BYJNVNFRVJWBMFOUGFFUPGQJQJOH
t/VNCFSPGFMCPXTBMMPXFEBUUIFTFMFOHUIT
(All applications include allowance for the terminations.)
Direct vent
Sidewall
with
Weil-McLain
vent/air cap
Direct vent
Sidewall with
separate pipes
— or —
%JSFDUFYIBVTU
(sidewall or vertical)
3” PVC Concentric
Sidewall or Vertical
(Use only PVC pipe
DO NOT use CPVC
or ABS)
[Note 1]
4” PVC Concentric
Sidewall or Vertical
(Use only PVC pipe
DO NOT use CPVC
or ABS)
[Note 1]
Direct vent
Vertical
with separate
pipes
Direct vent
Vertical exhaust
Sidewall air
Direct vent
only Direct vent or Direct exhaust Direct vent only Direct vent only Direct vent only Direct vent only
Length Ells Length Ells Length Ells Length Ells Length Ells Length Ells
80/105
2” * 100 (ab) 2 100 (a) 2 100 (ab) 1 NA 100 (a) 1 100 (a) 1
3” 100 2 100 2 100 1 NA 100 1 100 1
155 3” 100 2 100 2 100 1 NA 100 1 100 1
230
3” 30 (c) 2 30 (c) 2 30 (c) 1 30 (c)(d) 1 30 (c) 1 30 (c) 1
4” 100 (d) 2 100 2 70 (d) 1 100 1 100 1 100 1
299 4” 100 2 100 2 70 (d) 1 100 1 100 1 100 1
310 4” 100 2 100 2 70 (d) 1 100 1 100 1 100 1
399 4” 100 2 100 2 NA 100 1 100 1 100 1
Note 1:
IPEX 3” and 4” PVC concentric vent kits can be used with standard PVC pipe, fittings and cement (ANSI/ASTM D1785) except
where ULC S636 compliance is required. For ULC S636 compliance, all pipe, fittings and cement must be IPEX System 636. When
using IPEX kits, use only IPEX product code 196006 for 3”venting or IPEX product code 196021 for 4”venting.
Contact Weil-McLain for ordering information and availability of Weil-McLain venting kits.
Additional
notes
a —
Use 3”x2”reducer at boiler
C Use 3”x2”reducers at termination
c — Use 4”x3”reducer at boiler
d — Use 4”x3”reducers at termination
* Ultra-80 and 105 boilers installed with 2-inch vent piping automatically derate due to the pressure loss in the vent and air pip-
ing. The derate ranges up to 10% for the Ultra-80 at 100 feet or 15% for the Ultra-105 at 100 feet.
Equivalent feet for elbows — deduct from maximum equivalent length of
piping:
tGFFUQFSGPSFBDIJODIFMCPXPSJODI¡MPOHSBEJVTPS¡FMCPX
tGFFUGPSFBDIPSJODITIPSUSBEJVTFMCPX
Stainless (AL29-4C) vent pipe
install an adapter at the boiler for all applications. Also install an
adapter at the termination unless using separate-pipe termina-
tion.

Part number 550-100-103/1110 A–7
GAS-FIRED WATER BOILER — Manual addendum — Venting
Venting & air — general (cont.)
Figure 5 Vent and air piping materials — Use only the materials listed below, ensuring that all materials meet local codes
Item Material Standards for installations in:
United States Canada
Plastic piping materials
Vent or air pipe
&
fittings
PVC schedule 40 ANSI/ASTM D1785
Plastic vent pipe must be certified to
ULC S636 when required. (Note 2)
Air pipe can be any of those listed at
left if acceptable for local codes.
PVC-DWV (Note 1) ANSI/ASTM D2665
CPVC schedule 40 (Note 1) ANSI/ASTM F441
ABS-DWV schedule 40 (Note 1) ANSI/ASTM D2661
PVC & ABS pipe
cement & primer
PVC ANSI/ASTM D2564
CPVC (Note 1) ANSI/ASTM F493
ABS (Note 1) ANSI/ASTM D2235
AL29-4C piping materials
Vent pipe
AL29-4C
stainless
steel
Heat Fab, Inc. — Saf-T-Vent®
Z-Flex, Inc. — Z-Vent II
Simpson Dura-Vent — FasNSeal™
Certified for Category IV and direct vent
appliance venting
Certified for Category IV and direct vent
appliance venting
Weil-McLain bird screens (purchase separately)
Weil-McLain
bird
screens
For 2” or 3” vent or air termination
(cut to size if necessary)
3” vent screen:
W-M part number 383-500-105
For 3” or 4” vent or air termination
(cut to size if necessary)
4” vent screen:
W-M part number 383-500-110
Note 1: DO NOT use DWV, CPVC or ABS when using concentric vent termination. Use ONLY PVC schedule 40.
Note 2: IPEX PVC concentric terminations utilize PVC pipe/fittings certified to ULC S636. Where ULC S636 compliance is required, use
only IPEX System 636 pipe, fittings and cement.
AL29-4C vent piping — Install a PVC-to-stainless adapter supplied by the vent pipe manufacturer at the boiler vent connection
and at the termination (when using Weil-McLain plate or concentric PVC termination). DO NOT mix piping from different vent
pipe manufacturers unless using adapters specifically designed for the purpose by the manufacturer.
Plastic piping — Do not attempt to connect different types of plastic piping together.
DO NOT use cellular core pipe.
All vent and air pipes require a bird screen at each termination where specified in the manual or vent supplement. Purchase
bird screens separately from Weil-McLain or vent kit supplier. Note that most kits do not include the screens.

Part number 550-100-103/1110
GAS-FIRED WATER BOILER — Manual addendum — Venting
A–8
Sidewall vent/air termination: 3” or 4” concentric
Termination kit — 3” or 4” PVC concentric
termination
The 3” or 4” PVC concentric termination kit must be purchased1.
separately. See below.
Use only the vent materials and kits listed in Fig-
ure 2, page A-4 and Figure 4, page A-6 for concentric
venting. Provide pipe adapters as specified in Fig-
ure 4, page A-6.
Commonwealth of Massachusetts
When the boiler is installed within the Commonwealth of Mas-
sachusetts:
This product must be installed by a licensed plumber or gass
fitter.
See instruction in the Boiler manual.s
Allowable vent/air pipe materials
Use only the materials listed in Figure 5, page A-7.
Maximum piping length
Locate the termination such that the total air piping and vent piping1.
from the boiler to the termination will not exceed the maximum
length given in Figure 4, page A-6.
Maximum lengths listed in2. Figure 4, page A-6 allow for 1 elbow.
Additional elbows required a reduction in maximum length as
explained in the table notes.
Connecting from termination to boiler
Install the termination as instructed in the following.1.
Then proceed to2. page A-18 to complete the air and vent piping
between the termination and the boiler.
The center lines between the air and vent are wider at the concentric3.
termination connections than at the boiler. See Figure 15, page A-13
for suggestions on adjusting the spacing when required. In addi-
tion to the method given there, you can rotate the Y-fitting slightly,
which will cause the air pipe to be slightly higher or lower than
the vent, but the center lines will match those at the boiler vent
and air connections.
Determine locations for terminations
A gas vent extending through an exterior wall shall not
terminate adjacent to the wall or below building exten-
sions such as eaves, parapets, balconies or decks. Failure
to comply could result in severe personal injury, death
or substantial property damage.
Locate the vent/air terminations using the following guidelines.
You must consider the surroundings when terminating the vent1.
and air:
Position the vent termination where vapors will not damagea.
nearby shrubs, plants or air conditioning equipment or be
objectionable.
Termination location — 3” or 4” PVCFigure 6
concentric termination — height above grade
or snow line
Termination location — 3” or 4” PVCFigure 7
concentric termination — clearances to
openings
All vent and air pipes require a bird screen
at each termination. Most kits do not
include the screens. Purchase separately
from Weil-McLain or vent kit supplier if
not included.

Part number 550-100-103/1110 A–9
GAS-FIRED WATER BOILER — Manual addendum — Venting
Sidewall vent/air termination: 3” or 4” concentric (cont.)
The flue products will form a noticeable plume as they con-b.
dense in cold air. Avoid areas where the plume could obstruct
window views.
Prevailing winds could cause freezing of condensate and water/c.
ice buildup where flue products impinge on building surfaces
or plants.
Avoid possibility of accidental contact of flue products withd.
people or pets.
Do not locate the terminations where wind eddies could affecte.
performance or cause recirculation, such as inside building
corners, near adjacent buildings or surfaces, window wells,
stairwells, alcoves, courtyards or other recessed areas.
Do not terminate above any door or window or under a deck.f.
Condensate can freeze, causing ice formations.
Locate or guard vent to prevent condensate damage to exteriorg.
finishes.
Maintain clearances as shown in2. Figure 6, Figure 7, Figure 8 and
Figure 9. Also maintain the following:
Vent must terminate:a.
At least 6 feet from adjacent walls.s
No closer than 5 feet below roof overhang.s
At least 7 feet above any public walkway.s
At least 3 feet above any forced air intake within 10 feet.s
No closer than 12 inches below or horizontally from anys
door or window or any other gravity air inlet.
Air inlet must terminate at least 12” above grade or snowb.
line.
Do not terminate closer than 4 feet horizontally (above or be-c.
low) from any electric meter, gas meter, regulator, relief valve
or other equipment.
Locate terminations so they are not likely to be damaged by foreign3.
objects, such as stones or balls, or subject to buildup of leaves or
sediment.
Multiple vent/air terminations
When terminating multiple Ultra boilers, terminate each vent/air1.
connection as described in this addendum.
All vent pipes and air inlets must terminate at the same
height to avoid possibility of severe personal injury, death
or substantial property damage.
Place wall penetrations to obtain minimum clearance as shown in2.
Figure 9 for U. S. installations. For Canadian installations, provide
clearances required by CSA B149.1 or B149.2 Installation Code.
The air inlet of an Ultra boiler is part of a direct vent connection.3.
It is not classified as a forced air intake with regard to spacing from
adjacent boiler vents.
Combustion air (NOT vent piping) can be manifolded as shown4.
in Boiler manual, page 55.
Termination location — 3” or 4” PVCFigure 8
concentric termination — clearances to
public walkway or forced air intake
Termination location — 3” or 4” PVCFigure 9
concentric termination — multiple boilers —
clearance from vent of one to air intake of the
next

Part number 550-100-103/1110
GAS-FIRED WATER BOILER — Manual addendum — Venting
A–10
Installing and supporting the concentricFigure 10
sidewall vent assembly
Install terminations — concentric pipes
Assemble the vent termination as described for vertical concentric1.
terminations, beginning on page A-12.
If necessary, you can shorten the lengths of the inner and
outer pipes for a shorter finished assembly. But you must
ensure the pipes butt correctly at both ends. Failure to
properly assemble the concentric termination can result
in flue gas recirculation,causing possible severe personal
injury or death.
Wall penetration:2.
3” termination: Preferably, use a thimble with a 4½-inch hole.a.
If not using a thimble, carefully use a hole saw to cut a hole
not larger than 4¾ inches in diameter through the wall. The
finished hole must provide a solid stop for the rain cap ribs,
as shown in the inset to Figure 10.
4” termination: Preferably, use a thimble with a 6-inch hole.b.
If not using a thimble, carefully use a hole saw to cut a hole
not larger than 6¼ inches in diameter through the wall. The
finished hole must provide a solid stop for the rain cap ribs,
as shown in the inset to Figure 10.
Secure the termination in place so the rain cap will butt against the3.
outside wall or outer thimble plate as shown in Figure 10.
Before beginning vent and air piping from the boiler to the con-4.
centric termination, mount and secure the concentric termination
as shown in Figure 10 and Figure 11.
The vent and air piping must be securely supported, and
must not rest its weight on the boiler fittings. Failure to
properly support the vent and air piping could result in
vent piping damage, resulting in possible severe personal
injury, death or substantial property damage.
The supports/bracing used must support the termination
assembly to prevent slippage or movement.
The clamps used on the outside of the termination pipe
must not cut into the pipe or contain sharp edges that
could cause a crack to form.
When inserting the partially-assembled termination
kit through the roof penetration, wrap plastic or other
protection over the end of the exposed assembly to pre-
vent debris from entering the pipes. If the air passages
become blocked, the boiler will not operate. Once the
rain cap has been cemented to the assembly, there is no
way to correct the problem. The assembly would have
to be replaced if it were cut to be removed and cleaned.
Altering the assembly in any way could result in severe
personal injury or death due to toxic flue product emis-
sions.
When using AL294C stainless vent pipe, use the vent
pipe manufacturer’s PVC adapter when connecting to
the concentric vent attachment.
After the assembly has been positioned in the opening and all sup-5.
ports have been attached,install a bird screen (purchased separately
if not included with the kit) and rain cap as follows:
Place the bird screen on the end of the inner pipe as ina. Fig-
ure 17, page A-14.
Cement the rain cap in place as shown.b.
Sidewall vent/air termination: 3” or 4” concentric (cont.)
Figure 11 Concentric termination requirements
Concentric termination
(installing termination — see
page A-8)
Install pipe supports every 5s
feet on both the horizontal and
vertical runs.
Install a hanger support withins
6 inches of any upturn in the
piping.
The concentric terminations
assembly must be installed
before piping from the
boiler to the termination.
Support the terminations
at the wall as shown in the
termination instructions.
Slope horizontal pipings
downward toward the boiler at
least 1/4 inch per foot.
Rotate the concentrics
termination Y-fitting about
30° to result in pipe centers the
same as at the boiler.
Ensure that the wall material is strong enough
to prevent the rain cap from being pushed
inward if struck or pushed from the outside.