Crown Boiler MWC Series User manual

Models:
MWC116ENT
MWC116ELT
MWC116ENL
MWC116ELL
 

 
 
 
: Improper installation, adjustment, alteration,
service or maintenance can cause property damage, injury,
or loss of life. For assistance or additional information, con-
sult a qualied installer, service agency or the gas supplier.
This boiler requires a special venting system. Read these
instructions carefully before installing.
DE S I G N E D T O LE A D
Manufacturer of Hydronic Heating Products
P.O. Box 14818 3633 I. Street
Philadelphia, PA 19134
Tel: [phone] • Fax: [phone] • www.crownboiler.com
D E S I G N E D T O L E A D

1
Table of Contents
I. Product Description 2
II. Specifications 4
III. Before Installing 5
IV. Locating The Boiler 5
V. Mounting The Boiler 7
VI. Air For Ventilation 10
VII. Venting 12
A. Vent System Design 12
B. Removing An Existing Boiler From Common Chimney 19
C. Assembly of Crown 60/100 Concentric Venting 20
D. Assembly of Crown 80/125 Concentric Venting 24
E. Condensate Trap and Drain Line 33
VIII. Gas Piping 34
IX. System Piping 36
X. Domestic Water Piping 43
XI. Wiring 46
XII. Start-up and Checkout 51
XIII. Operation 58
XIV. Service and Maintenance 62
XV. Troubleshooting 66
XVI. Parts 69
Appendix A Special Requirements For Side-Wall 84
Vented Appliances In The Commonwealth
of Massachusetts

2
I Product Description
The MWC Series are gas fired condensing boilers designed for use in forced hot water heating systems
requiring supply water temperatures of 176F or less and return water temperatures greater than 86F. The
primary heat exchanger is a copper water tube design. Additional heat is extracted from the flue gas in a
stainless steel secondary heat exchanger located down stream of the inducer. These boilers include a built in
circulator, expansion tank, and automatic air vent. In addition, “combi” models include a plate exchanger for
domestic hot water (DHW) generation. All MWC Series boilers are designed for installation on a wall and may
be vented vertically or horizontally with combustion air supplied from outdoors.
Key Component
1 Primary Heat Exchanger
2 Secondary Heat Exchanger
3 Inducer
4 Burner
5 Electrodes and Flame Rod
6 Circulator
7 Automatic Air Vent
8 Condensate Trap
9 Control Box
10 Differential Boiler Water Pressure Switch
11 Ignition module/Gas Valve
12 Air Pressure Switch
13 Flue Gas Temperature Limit
14 Supply Temperature Limit
* Expansion Tank
* Plate Heat Exchanger (Combi Only)
* 3-Way Diverting Valve (Combi Only)
* Supply Temperature Sensor
* DHW Temperature Sensor (Combi Only)
* DHW Flow Switch (Combi Only)
* Not visible

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Figure 1.1: MWC Boiler Principle Components

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Table 2.2: Ratings
MODEL* APPLICATION MAX. INPUT
(BTU/hr)
MINIMUM INPUT (BTU/
hr) D.O.E.
HEATING
CAPY.
(BTU/hr)
IBR NET
RATING
(BTU/hr)
AFUE
(%)
DHW Output (GPM)
HEATING DHW 77F Rise 90F Rise
MWC116E*T Combi 116,000 75,000 49,500 102,000 89,000 85.0 2.67 2.25
MWC116E*L Heat Only 116,000 75,000 N/A 102,000 89,000 85.0 N/A N/A
* Insert suffix “N” for natural gas and “L” for propane. Ratings are the same for both fuels (Example: MWC116ENT denotes Natural
Gas, Combi).
Table 2.3: Maximum Vent Lengths
Using 60/100mm Concentric Vent System Supplied with the Boiler................................................................25 in.
Using Optional 60/100mm Concentric Vent Components ...............................................................................8ft -10in
Using Optional 80/125mm Concentric Vent Components................................................................................27 ft
See Vent Section for additional venting options and requirements
II Specifications
Figure 2.1: General Configuration
Table 2.4: Other Specifications
Maximum Supply Temperature.............................................176 F
Minimum Continuos Return Temperature.............................86F
Maximum Allowable Working Pressure................................30 psi
Minimum System Pressure (at boiler ...................................4.4 psi
Maximum Achievable Flow Through Boiler .........................5.5 GPM
Minimum Temperature Rise Across Boiler at High Fire........37 F
Maximum Gas Inlet pressure ...............................................10.5” Nat / 13.0” LP
Minimum Gas Inlet Pressure................................................5.3” Nat / 10.5” LP
Electrical Ratings..................................................................120VAC/60Hz/1.8A
Thermostat Voltage..............................................................120VAC

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III Before Installing
Safe, reliable operation of this boiler depends upon installation by a professional heating contractor in1)
strict accordance with this manual and the authority having jurisdiction.
In the absence of an authority having jurisdiction, installation must be in accordance with this manual•
and the National Fuel Gas Code, ANSI Z223.1.
Where required by the authority having jurisdiction, this installation must conform to the• Standard for
Controls and Safety Devices for Automatically Fired Boilers (ANSI/ASME CSD-1).
Read Section VII to verify that the maximum combustion air and exhaust pipe lengths will not be2)
exceeded in the planned installation. Also verify that the vent terminal can be located in accordance with
Section VII.
Make sure that the boiler is correctly sized:3)
For heating systems employing convection radiation (baseboard or radiators), use an industrya)
accepted sizing method such as the I=B=R Heat Loss Calculation Guide (Pub. #H21 or #H22)
published by the Hydronics Institute in Berkeley Heights, NJ.
In sizing the boiler take into consideration the following boiler water flow/temperature limitations:b)
Maximum regulated supply temperature is 176F•
Maximum flow through the boiler is approximately 5.5GPM.•
Minimum boiler temperature rise is approximately 37F at high fire.•
For new radiant heating systems, refer to the radiant tubing manufacturer’s boiler sizing guidelines.c)
For combi boilers make sure that the domestic hot water flow rate shown in Table 2.2, will bed)
adequate to meet the peak demand for domestic hot water.
Make sure that the boiler received is configured for the correct gas (natural or LP).5)
Make sure that the boiler is configured for use at the altitude at which it is to be installed.6)
IV Locating the Boiler
Observe the minimum clearances shown in Figure 4.1. These clearances apply to both combustible and1)
non-combustible materials.
Note the recommended service clearances in Figure 4.1. These service clearances are recommended,2)
but may reduced to the combustible clearances provided:
Access to the front of the boiler is provided through a door•
Access is provided to the condensate trap located underneath the boiler.•
The relief valve must be installed in the factory specified location.3)
The boiler should be located so as to minimize the length of the vent system.4)
The combustion air piping must terminate where outdoor air is available for combustion and away from6)
areas that will contaminate combustion air. Avoid areas near chemical products containing chlorine,
chloride based salts, chloro/fluorocarbons, paint removers, cleaning solvents and detergents.
NOTICE
This product must be installed by a licensed plumber or gas fitter when installed within the
Commonwealth of Massachusetts. See Appendix A for additional important information about
installing this product within the Commonwealth of Massachusetts.
Natural Gas and Propane Installation Code.
The boiler must not be installed on carpeting.5)
/NFPA 54 and/or CAN/CSA B 149.1

6
Figure 4.1: Clearances To Combustible Or Non-combustible Material
Clearance From
Hot Water Pipes To
Combustibles = 1”

7
V Mounting The Boiler
CAUTION
This boiler weighs approximately 110 pounds:
Two people are required to safely lift this boiler onto the wall mounting hook.•
Make sure that wall mounting hook is anchored to a structure capable of supporting the•
weight of the boiler and attached piping when filled with water.
Jurisdictions in areas subject to earthquakes may have special requirements for supporting
this boiler. These local requirements take precedence over the requirements shown below.
Mounting Steps:
If the boiler is installed on a framed wall, minimum acceptable framing are 2 x 4 studs. The boiler1)
mounting holes are on 11-5/8” centers. Usually the wall studs will be on 16” centers. In such cases, both
boiler bracket mounting holes must be anchored to ¾” Plywood, horizontal 2 x 4s anchored to the studs,
or some other framing system capable of supporting the boiler. Attachment of either bracket hole to
wallboard alone is unacceptable.
When mounting this boiler directly onto studs covered with 1/2” wall board, 5/16 x 2” lag screws are2)
recommended. When the boiler is attached to other types of construction, such as masonry, use fasteners
capable of supporting the weight of the boiler and attached piping in accordance with good construction
practice and applicable local codes.
Make sure that the surface to which the boiler is mounted is plumb.3)
Before mounting the boiler, make sure that wall selected does not have any framing or other construction4)
that will interfere with the vent pipe penetration.
Tape the paper template to the wall in the chosen location. Be sure to level the template.5)
Pre-drill two holes in the center of the “oval” slots on the mounting bracket sized for the hardware being6)
used.
Mount the bracket to the wall. Be sure to level the bracket by adjusting the screw in the vertical slot.7)
Pre-drill the remaining hole in the mounting bracket and secure the final screw.8)
Cut the opening in the wall for the vent system. The recommended hole diameter for the standard9)
60/100mm venting is 4-3/8”.
Hang the boiler on the wall bracket as shown in Figure 5.2.10)
Verify that the front and sides of the boiler are plumb.11)
See Section VII (“Venting) for instructions on attaching the vent system to the boiler.12)
A hot water boiler installed above radiation level or as the Authority having jurisdiction,
must be provided with a low water cutoff device either as a part of the boiler or at the time of installation.
13)

8
Figure 5.1 Wall Mounting Hole Locations

9
Figure 5.2 Boiler Mounting

10
VI Air for Ventilation
WARNING
Outdoor combustion air must be piped to the air intake. Never pipe combustion air from areas containing
contaminates such as areas where swimming pool chemicals are stored. Contaminated combustion
air will damage the boiler and may cause property damage, personal injury or loss of life.
Air for combustion must always be obtained directly from outdoors, however sufficient air for ventilation must
still be provided in the boiler room. Air for ventilation is required to keep various boiler components from
overheating and is always obtained from indoors. To ensure an adequate ventilation air supply, perform the
following steps:
Step 1: Determine whether the boiler is to be installed in a confined space - A confined space is defined by
the
Total the input of all appliances in the boiler room in thousands of BTU/hr. Round the result to the nextA.
highest 1000 BTU/hr.
Find the volume of the room in cubic feet. The volume of the room in cubic feet is:B.
Length (ft) x width (ft) x ceiling height (ft)
In calculating the volume of the boiler room, consider the volume of adjoining spaces only if no doors
are installed between them. If doors are installed between the boiler room and an adjoining space, do
not consider the volume of the adjoining space, even if the door is normally left open.
Divide the volume of the boiler room by the input in thousands of BTU/hr. If the result is less than 50, theC.
boiler room is a confined space.
Example:
A MWC116 and a water heater are to be installed in a room measuring 6ft – 3 in x 7ft with an 8 ft ceiling. The
water heater has an input of 30000 BTU/hr:
Total input in thousands of BTU/hr = (116000 BTU/hr + 30000 BTU/hr) / 1000 = 146 MBTU/hr
Volume of room = 6.25 ft x 7 ft x 8 ft = 350 ft3
350/146 = 2.40. Since 2.33 is less than 50, the boiler room is a confined space.
Step 2a: If the boiler is to be placed in a confined space, provide two openings into the boiler room, one near
the floor and one near the ceiling. The top edge of the upper opening must be within 12” of the ceiling and the
bottom edge of the lower opening must be within 12” of the floor (Fig 6.1). The minimum opening dimension is
3 inches.
If the MWC boiler is the only gas-burning appliance in the boiler room, these openings must each•
have a minimum free area of 54 square inches.
If other gas-burning appliances are in the boiler room, size the openings in accordance with the•
appliance manufacturer’s instructions or the National Fuel Gas Code
54 square inches even if opening requirements for other appliances are less.
,ANSI Z223.1. Natural Gas and Propane Installation Code.
/NFPA 54 and/or CAN/CSA B 149.1National Fuel Gas Code
as having a volume less than 50 cubic feet per 1000 BTU/hr input of all appliances
installed in that space. To determine whether the boiler room is a confined space:
ANSI Z223.1.
/NFPA 54 and/or CAN/CSA B 149.1.
Minimum opening free area is
Air for combustion and ventilation, of the National Flue Gas Code, ANSI Z223.1/NFPA 54 CAN/CSA B 149.1
Natural Gas and Propane Installation Code, or applicable provisions of the local building codes.

11
Figure 6.1: Boiler Installed In A Confined Space, Ventilation Air From Inside
Step 2a (contd.)
If the total volume of both the boiler room and the room to which the openings connect is less than• 50 cubic feet per 1000 BTU/hr of total appliance input, install a pair of identical openings into a third
room. Connect additional rooms with openings until the total volume of all rooms is at least 50 cubic
feet per 1000 BTU/hr of input.
The “free area” of an opening takes into account the blocking effect of mesh, grills, and louvers.• Where screens are used, they must be no finer than ¼” (4 x 4) mesh.
Step 2b: If the boiler is to be placed in an unconfined space the natural infiltration into the boiler room will
provide adequate air for ventilation without additional openings into boiler room.

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VII Venting
WARNING
Failure to vent this boiler in accordance with these instructions could cause flue gas to enter
the building resulting in severe property damage, personal injury, or death:
Do not attempt to vent this boiler with galvanized, PVC, or any other vent components not• listed in Table 7.3.
Do not obtain combustion air from within the building.• Do not install a barometric damper or drafthood on this boiler.•
A. Vent System Design
There are two basic ways to vent this boiler:
Horizontal (“Side Wall”) Concentric Venting• - Vent system exits the building through an outside
wall. Concentric venting consists of a “pipe within a pipe”. Flue gas exits the building through the inner
pipe and combustion air is drawn into the boiler through the space between the inner and outer pipe.
Vertical Concentric Venting -• Vent system exits the building through the roof. Concentric venting
consists of a “pipe within a pipe”. Flue gas exits the building through the inner pipe and combustion
air is drawn into the boiler through the space between the inner and outer pipe.
Both of these systems are considered “direct vent” because in both, combustion is drawn directly from the
outdoors into the boiler. A description of all of these venting options are shown in Tables 7.1 and 7.6. For
clarity, these vent options are numbered from 1 to 6. One of the vent option columns in Tables 7.1 or 7.6 must
match the planned vent and air intake system exactly. In addition, observe the following guidelines:
Approved vent systems1) - Use only one Concentric vent system components supplied by Crown. The
standard boiler is supplied with a concentric vent system having a maximum usable length of 25” (Figure
2.1). For longer runs, additional straight lengths and elbows are available from Crown. In some cases,
larger diameter concentric pipe must be used. Each Crown concentric vent component consists of an
inner pipe of polypropylene and the outer pipe of steel. Integral gaskets on each concentric fitting provide
a gas tight seal. A list of all Crown concentric vent components is shown in Table 7.3.
In this manual, concentric pipe sizes are called out in terms of the inner and outer pipe nominal
diameters in millimeters. For example, “60/100mm” pipe consists of a 60mm exhaust pipe inside a
100mm diameter outer pipe.
Maximum Vent and Air Intake Lengths2) - The maximum length of the vent air intake piping depends upon
the vent option selected. See Table 7.1 or 7.6 for the maximum vent length. In horizontal vent systems,
the lengths shown in Table 7.1 are in addition to the Elbow Adaptor on top of the boiler. If more elbows
are desired, the maximum allowable vent length must be reduced by the amount shown in Table 7.5 for
each additional elbow used. Termination fittings are never counted, although the length of the concentric
terminal section is counted.
CAUTION
Moisture and ice may form on the surfaces around the vent termination. To prevent
deterioration, surfaces should be in good repair (sealed, painted, etc.).

13
2 (contd.)
Example: A 60/100mm concentric vent system is planned for a horizontally vented MWC116 which
has the following components:
60/100mm Elbow Adaptor (supplied with the boiler)• 1 ft Straight Pipe• 90 elbow• Uncut Terminal Section (supplied with the boiler)•
The Vent Option #2 column in Table 7.1 describes a horizontal direct vent system using 60/100mm
concentric vent pipe. From this column, we see that a MWC116 may have a vent length of up to 8ft-
10in. The 60/100 ElbowAdaptor supplied with the boiler is not considered. The length of the terminal
section (not including the plastic terminal itself) is approximately 22 1/2” (1.9ft) installed. From Table
7.5, we see that the equivalent length of the 60/100mm elbow is 4.5ft. The total equivalent length of
the planned venting system is therefore:
1ft (Straight ) + 4.5ft (90 Elbow) + 1.9ft (Uncut Terminal Section) = 7.4ft.
Since Table 7.1 shows a maximum allowable vent length of 8ft-10in, the planned vent system length
is acceptable. Note that the 82mm inlet air orifice supplied with the boiler is not used.
Minimum Vent and Air Intake Lengths3) - Observe the minimum vent lengths shown in Tables 7.1 and 7.6.
Permitted Terminals for Horizontal Venting:4)
Vent Option 1, 2• - The 60/100mm concentric vent terminal is supplied with the boiler as part of the
standard vent system.
Vent Option 3• - Use the optional 80/125mm Concentric Vent Terminal (Crown PN 230531)
Horizontal Vent Terminal Location5) - Observe the following limitations on the vent terminal location (also
see Figure 7.4).
Vent terminal must be at least 1 foot from any door, window, or gravity inlet into the building.• The bottom of the terminal must be at least 12” above the normal snow line. In no case should it be• less than 12” above grade level.
The bottom of the vent terminal must be at least 7 feet above a public walkway.• Do not install the vent terminal directly over windows or doors.• The bottom of the vent terminal must be at least 3 feet above any forced air inlet located within 10• feet.
In the USA, maintain a clearance of at least 4ft horizontally from the vent terminal to gas meters,• electric meters, regulators and relief equipment. In Canada, maintain a 6ft clearance between the
vent terminal and these devices.
Do not locate the vent terminal under decks or similar structures.• Top of vent terminal must be at least 5 feet below eves, soffits, or overhangs. Maximum depth of• overhang is 3 ft.
Vent terminal must be at least 6 feet from an inside corner.• Vent Terminal must be at least 2ft from adjacent buildings.• Under certain conditions, water in the flue gas may condense, and possibly freeze, on objects around• the vent terminal including on the structure itself. If these objects are subject to damage by flue gas
condensate, they should be moved or protected.
If possible, install the vent and air intake terminals on a wall away from the prevailing wind. Reliable• operation of this boiler cannot be guaranteed if these terminals are subjected to winds in excess of 40
mph.
Air intake terminal must not terminate in areas that might contain combustion air contaminates, such• as near swimming pools. See Section IV for more information on possible contaminates.

14
Table 7.1: Summary Of Horizontal Venting Options
VENT OPTION # 1 2 3 4
CLASSIFICATION USED IN THIS
MANUAL
HORIZONTAL
CONCENTRIC
HORIZONTAL
CONCENTRIC
HORIZONTAL
CONCENTRIC
RESERVED
FOR FUTURE
USE
ILLUSTRATED IN FIGURE 7.2 7.2 7.2
VENT PIPE PENETRATION
THROUGH STRUCTURE WALL WALL WALL
VENT PIPE SIZE 60/100 mm
CONCENTRIC
60/100 mm
CONCENTRIC
80/125 mm
CONCENTRIC
INLET AIR ORIFICE SIZE 82mm Not Used 82mm
MAX. VENT LENGTH 25in 8ft - 10in 27ft - 10in
MIN. VENT LENGTH 6in 26in 6in
VENT TERMINAL
CROWN
#230520
(INCLUDED
WITH BOILER)
CROWN
#230520
(INCLUDED
WITH BOILER)
CROWN
#230531
VENT MATERIAL
CROWN
60/100mm
VENT
COMPO-
NENTS
SHOWN IN
TABLE 7.3a
CROWN
60/100mm
VENT
COMPO-
NENTS
SHOWN IN
TABLE 7.3a
CROWN
80/125mm VENT
COMPONENTS
SHOWN IN
TABLE 7.3b
Figure 7.2: Horizontal Concentric Venting (Vent Options 1-3)

15
Table 7.3a: Crown Concentric 60/100 Vent Components (Vent Options 1,2)
CROWN PN DESCRIPTION SIZE USED ON VENT
OPTION # COMMENTS
340509 60/100mm ELBOW ADAPTOR 60/100mm 1,2 INCLUDED WITH STANDARD BOILER
340503 60/100mm STRAIGHT ADAPTOR 60/100mm 2 OPTIONAL
230520 TERMINAL SECTION 60/100mm 1,2 INCLUDED WITH STANDARD BOILER
230522 WALL GROMMET 60/100mm 1,2 INCLUDED WITH STANDARD BOILER
230505 39” STRAIGHT 60/100mm 2 OPTIONAL - MAY NOT BE CUT
230504 78” STRAIGHT 60/100mm 2 OPTIONAL - MAY NOT BE CUT
230506 19 1/2” STRAIGHT 60/100mm 1,2 OPTIONAL - CAN BE CUT
230507 90 DEGREE ELBOW 60/100mm 2 OPTIONAL
230508 45 DEGREE ELBOW 60/100mm 2 OPTIONAL
230515 39” STRAIGHT 80/125mm 1 OPTIONAL - CAN BE CUT
340130 82mm AIR INLET ORIFICE 82mm ID 1 INCLUDED WITH STANDARD BOILER
Table 7.3b: Crown Concentric 80/125 Vent Components (Vent Options 3,5)
CROWN PN DESCRIPTION SIZE USED ON VENT
OPTION # COMMENTS
340523 80/125 STRAIGHTADAPTOR 80/125mm 3,5
230527 90 DEGREE EL (STANDARD) 80/125mm 3,5
230528 90 DEGREE EL (SWEEP) 80/125mm 3,5
230526 45 DEGREE EL 80/125mm 3,5
230517 19 1/2” STRAIGHT 80/125mm 3,5 CAN BE CUT
230515 39” STRAIGHT 80/125mm 3,5 CAN BE CUT
230518 39” STRAIGHT 80/125mm 3,5 MAY NOT BE CUT
230519 78” STRAIGHT 80/125mm 3,5 MAY NOT BE CUT
230525 TELESCOPING STRAIGHT 80/125mm 3,5 ADJUSTABLE FROM 12-1/2” TO 16-1/2
230531 HORIZONTAL TERMINAL 80/125mm 3
230532 VERTICAL TERMINAL 80/125mm 5 (NOTE #1)
230533 FLAT ROOF FLASHING 80/125mm 5
230535 SLOPED ROOF FLASHING 80/125mm 5 (NOTE #2)
230530 SUPPORT ELBOW WITH
CHIMNEY CHASE BRACKET 80/125mm 5 (NOTE #3)
230536 SUPPORT BAND 80/125mm 3,5
Table 7.3b Notes:
1) Vertical terminal can be used with either of the roof flashings listed beneath it.
2) Sloped roof flashing suitable for roof angles between 25 and 45 degrees.
3) Used at base of vertical run inside unused masonry chimney.

16
Figure 7.4a: Location Of Vent Terminal Relative To Windows, Doors, Grade
Figure 7.4b: Location Of Vent Terminal Relative To Meters And Forced Air Inlets
Figure 7.4c: Positioning Vent Terminal Under Overhangs

17
Permitted Terminals for Vertical Venting6) - Use Crown PN 230532 with the appropriate ashing (Table 7.3b)
Vertical Vent Terminal Locations (Vent Option 5)7) - Observe the following limitations on the location of all
vertical vent terminals (see Figure 7.7):
The top of the vent pipe must be at least 2 feet above any object located within 10 feet.•
The bottom of the air inlet terminal must be at least 12” above the normal snow accumulation that can be •
expected on the roof. The terminal used in Vent Option #5 has a xed distance above the storm collar of
19”. If a greater distance is needed to provide the clearance above the snow line, build a chase on the
roof and mount the vertical terminal on top of the chase.
Wall thimbles8) – Concentric vent has a “zero” clearance to combustibles and therefore does not require the
use of wall thimbles.
Pitch of Horizontal Piping9) - Pitch all horizontal piping so that any condensate which forms in the piping will run
towards the boiler. Pitch Crown horizontal concentric venting 5/8” per foot
Supporting Pipe10) - Vertical and horizontal sections of pipe must be properly supported. Support Crown
concentric venting near the female end of each straight section of pipe. Exception: Vertical runs of concentric
pipe in an unused chimney (Figure 7.36) need only be supported at the terminal and at the base of the run.

VENT FITTING EQUIVALENT LENGTH (ft)
60/100mm 90° CONCENTRIC ELBOW 4.5
60/100mm 45° CONCENTRIC ELBOW 4.0
80/125mm 90° CONCENTRIC ELBOW 8.5
80/125mm 90° SWEEP CONCENTRIC ELBOW 5.5
80/125mm 45° CONCENTRIC ELBOW 3.0
80/125mm 90° CONCENTRIC SUPPORT ELBOW 8.5

VENT OPTION # 56
CLASSIFICATION USED IN THIS
MANUAL
VERTICAL
CONCENTRIC
RESERVED FOR
FUTURE USE
ILLUSTRATED IN FIGURE 7.7
VENT PIPE PENETRATION
THROUGH STRUCTURE ROOF
VENT PIPE SIZE 80/125mm
CONCENTRIC
INLET AIR ORIFICE SIZE 82mm
MAX. VENT LENGTH 27ft - 10in
MIN. VENT LENGTH 6in
VENT TERMINAL
CROWN #230532
CONCENTRIC
TERMINAL (TABLE
7.3b)
VENT MATERIAL
CROWN 80/125 mm
VENT COMPONENTS
SHOWN IN TABLE
7.3b

18
Figure 7.7: Vertical Concentric Vent System (Vent Option 5)