Crown Boiler MWC116ENL, MWC, MWC116ELL, MWC116ELT, MWC116ENT User Manual
D E S I G N E D T O L E A D
Manufacturer of Hydronic Heating Products
P.O. Box 14818 3633 I. Street
Philadelphia, PA 19134
Tel: (215) 535-8900 • Fax: (215) 535-9736 • www.crownboiler.com
Models:
: Improper installation, adjustment, alteration,
MWC116ENT
MWC116ELT
MWC116ENL
MWC116ELL
service or maintenance can cause property damage, injury,
or loss of life. For assistance or additional information, con-
sult a qualied installer, service agency or the gas supplier.
This boiler requires a special venting system. Read these
instructions carefully before installing.
Table of Contents
I. Product Description 2
II. Specifi cations 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
1
I Product Description
The MWC Series are gas fi red 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 fl ue 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
2
Figure 1.1: MWC Boiler Principle Components
3
II Specifi cations
Figure 2.1: General Confi guration
Table 2.2: Ratings
MINIMUM INPUT (BTU/
MAX.
MODEL* APPLICATION
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 suffi x “N” for natural gas and “L” for propane. Ratings are the same for both fuels (Example: MWC116ENT denotes Natural
Gas, Combi).
INPUT
(BTU/hr)
HEATING DHW 77F Rise 90F Rise
hr)
D.O.E.
HEATING
CAPY.
(BTU/hr)
IBR NET
RATING
(BTU/hr)
AFUE
DHW Output (GPM)
(%)
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
Table 2.4: Other Specifi cations
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
4
III Before Installing
Safe, reliable operation of this boiler depends upon installation by a professional heating contractor in 1)
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.
Natural Gas and Propane Installation Code.
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 be 2)
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 industry a)
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 fl ow/temperature limitations:b)
Maximum regulated supply temperature is 176F•
Maximum fl ow through the boiler is approximately 5.5GPM. •
Minimum boiler temperature rise is approximately 37F at high fi re. •
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 fl ow rate shown in Table 2.2, will be d)
adequate to meet the peak demand for domestic hot water.
/NFPA 54 and/or CAN/CSA B 149.1
Make sure that the boiler received is confi gured for the correct gas (natural or LP).5)
Make sure that the boiler is confi gured for use at the altitude at which it is to be installed. 6)
NOTICE
This product must be installed by a licensed plumber or gas fi tter when installed within the
Commonwealth of Massachusetts. See Appendix A for additional important information about
installing this product within the Commonwealth of Massachusetts.
IV Locating the Boiler
Observe the minimum clearances shown in Figure 4.1. These clearances apply to both combustible and 1)
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 specifi ed location.3)
The boiler should be located so as to minimize the length of the vent system.4)
The boiler must not be installed on carpeting.5)
The combustion air piping must terminate where outdoor air is available for combustion and away from 6)
areas that will contaminate combustion air. Avoid areas near chemical products containing chlorine,
chloride based salts, chloro/fl uorocarbons, paint removers, cleaning solvents and detergents.
5
Clearance From
Hot Water Pipes To
Combustibles = 1”
Figure 4.1: Clearances To Combustible Or Non-combustible Material
6
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 fi lled 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 boiler 1)
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 are 2)
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 construction 4)
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 being 6)
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 fi nal screw.8)
Cut the opening in the wall for the vent system. The recommended hole diameter for the standard 9)
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,
13)
must be provided with a low water cutoff device either as a part of the boiler or at the time of installation.
7
Figure 5.1 Wall Mounting Hole Locations
8
Figure 5.2 Boiler Mounting
9
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 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.
Air for combustion must always be obtained directly from outdoors, however suffi cient 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 confi ned space - A confi ned space is defi ned by
the
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 confi ned space:
Total the input of all appliances in the boiler room in thousands of BTU/hr. Round the result to the next A.
highest 1000 BTU/hr.
,ANSI Z223.1.
/NFPA 54 and/or CAN/CSA B 149.1National Fuel Gas Code
Natural Gas and Propane Installation Code.
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, the C.
boiler room is a confi ned 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 ft
350/146 = 2.40. Since 2.33 is less than 50, the boiler room is a confi ned space.
Step 2a: If the boiler is to be placed in a confi ned space, provide two openings into the boiler room, one near
the fl oor 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 fl oor (Fig 6.1). The minimum opening dimension is
3 inches.
3
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
/NFPA 54 and/or CAN/CSA B 149.1.
54 square inches even if opening requirements for other appliances are less.
Minimum opening free area is
ANSI Z223.1.
10
Figure 6.1: Boiler Installed In A Confi ned 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 fi ner than ¼” (4 x 4) mesh.
Step 2b: If the boiler is to be placed in an unconfi ned space the natural infi ltration into the boiler room will
provide adequate air for ventilation without additional openings into boiler room.
11
VII Venting
WARNING
Failure to vent this boiler in accordance with these instructions could cause fl ue 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.•
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.).
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 fi tting 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 fi ttings are never counted, although the length of the concentric
terminal section is counted.
12
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 8ft10in. The 60/100 Elbow Adaptor 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 orifi ce supplied with the boiler is not used.
Minimum Vent and Air Intake Lengths 3) - 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, soffi ts, 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 fl ue 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 fl ue 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.
13
Table 7.1: Summary Of Horizontal Venting Options
VENT OPTION # 1 2 3 4
CLASSIFICATION USED IN THIS
MANUAL
ILLUSTRATED IN FIGURE 7.2 7.2 7.2
HORIZONTAL
CONCENTRIC
HORIZONTAL
CONCENTRIC
HORIZONTAL
CONCENTRIC
RESERVED
FOR FUTURE
USE
VENT PIPE PENETRATION
THROUGH STRUCTURE
VENT PIPE SIZE
INLET AIR ORIFICE SIZE
MAX. VENT LENGTH
MIN. VENT LENGTH
VENT TERMINAL
VENT MATERIAL
WALL WALL WALL
60/100 mm
CONCENTRIC
82mm
25in
6in
CROWN
#230520
(INCLUDED
WITH BOILER)
CROWN
60/100mm
VENT
COMPO-
NENTS
SHOWN IN
TABLE 7.3a
60/100 mm
CONCENTRIC
Not Used 82mm
8ft - 10in 27ft - 10in
26in 6in
CROWN
#230520
(INCLUDED
WITH BOILER)
CROWN
60/100mm
VENT
COMPO-
NENTS
SHOWN IN
TABLE 7.3a
80/125 mm
CONCENTRIC
CROWN
#230531
CROWN
80/125mm VENT
COMPONENTS
SHOWN IN
TABLE 7.3b
Figure 7.2: Horizontal Concentric Venting (Vent Options 1-3)
14
Table 7.3a: Crown Concentric 60/100 Vent Components (Vent Options 1,2)
USED ON
CROWN PN DESCRIPTION SIZE
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
VENT
OPTION #
COMMENTS
Table 7.3b: Crown Concentric 80/125 Vent Components (Vent Options 3,5)
USED ON
CROWN PN DESCRIPTION SIZE
340523 80/125 STRAIGHT ADAPTOR 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
230536 SUPPORT BAND 80/125mm 3,5
Table 7.3b Notes:
1) Vertical terminal can be used with either of the roof fl ashings listed beneath it.
2) Sloped roof fl ashing suitable for roof angles between 25 and 45 degrees.
3) Used at base of vertical run inside unused masonry chimney.
SUPPORT ELBOW WITH
CHIMNEY CHASE BRACKET
80/125mm 5 (NOTE #3)
VENT
OPTION #
COMMENTS
15
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
16
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
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 OPTION # 5 6
CLASSIFICATION USED IN THIS
MANUAL
ILLUSTRATED IN FIGURE 7.7
VENT PIPE PENETRATION
THROUGH STRUCTURE
VENT PIPE SIZE
INLET AIR ORIFICE SIZE
MAX. VENT LENGTH
MIN. VENT LENGTH
VENT TERMINAL
VERTICAL
CONCENTRIC
ROOF
80/125mm
CONCENTRIC
82mm
27ft - 10in
6in
CROWN #230532
CONCENTRIC
TERMINAL (TABLE
7.3b)
RESERVED FOR
FUTURE USE
CROWN 80/125 mm
VENT MATERIAL
VENT COMPONENTS
SHOWN IN TABLE
7.3b
17
Figure 7.7: Vertical Concentric Vent System (Vent Option 5)
18
B. Removing an Existing Boiler From a Common Chimney
Read this only if the MWC boiler is replacing an existing boiler that is being removed from a common
chimney. This section does not apply to the installation of a MWC boiler.
In some cases, when an existing boiler is removed from a common chimney, the common venting system
may be too large for the remaining appliances. 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.
(a) Seal any unused openings in the common venting system.
(b) Visually inspect the venting system for proper size and horizontal pitch and determine there is no
blockage or restriction, leakage, corrosion and other defi ciencies which could cause an unsafe
condition.
(c) Insofar as practical, close all building doors and windows and all doors between the space in which
all 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 operate at maximum speed. Do not operate a summer exhaust fan. Close fi replace dampers.
(d) Place in operation the appliance being inspected. Follow the lighting instructions. Adjust
thermostat so the appliance will operate continuously.
(e) Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use
the fl ame of a match or candle, or smoke from a cigarette, cigar, or pipe.
(f) After it has been determined that each appliance remaining connected to the common venting
system properly vents when tested as outlined above, return doors, windows, exhaust fans,
fi replace dampers and any other gas-burning appliances to their previous condition of use.
(g) Any improper operation of the common venting system should be corrected so the installation
conforms with the National Fuel Gas Code, ANSI Z223.1.
Natural Gas and Propane Installation Code.
common venting system, the common venting system should be re sized to approach the minimum
size as determined using the appropriate tables in Part 11 of the National Fuel Gas Code, ANSI
Z223.1.
/NFPA 54 and/or CAN/CSA B 149.1
When re-sizing any portion of the
/NFPA 54 and/or CAN/CSA B 149.1
WARNING
Never common vent a MWC boiler with other appliances.
19
C. Assembly of Crown 60/100mm Concentric Venting
Figure 7.20. For V
(IMPORTANT - Skip to Section D for 80/125mm Concentric V ent Assembly)
WARNING
Failure to follow the instructions could result in fl ue gas leakage into the combustion air or indoor
air, resulting in unsafe or unreliable operation.
• Do not lubricate concentric gaskets with anything other than water.
• Do not attempt to cut any piping except as permitted in this section. When cutting these
sections, make sure all cuts are square and allow for proper insertion.
• Do not attempt to try to mix this concentric pipe with other venting systems.
Concentric vent components supplied with the boiler are packed in a separate carton and include the following:1)
60/100mm elbow adaptor (Crown PNa) 340509).
60/100mm terminal section (straight section with a terminal and overall length of 27 3/4” (Crown PN 230520).b)
Two (2) Rubber wall grommets (Crown PN c) 230522).
Vent gasket and screws for attachment of vent system to boiler. d)
The 82mm air inlet orifi ce required for Vent Option 1 is packed in the boiler carton.
The 60/100 straight adaptor is optional equipment. It is supplied with the same screws and gasket as the 60/100
elbow adaptor.
Start by attaching the elbow adaptor (or straight adaptor, if used instead) to the top of the boiler using the gasket 2)
and four 4.2mm sheet metal screws provided in the vent kit as shown in
82mm air inlet orifi ce as shown.
If no additional sections of concentric pipe are required, attach the terminal section to the elbow. In most cases, it 3)
will need to be cut before doing so. Use the following procedure to cut the pipe:
Measure distance “L” from the outside surface of the exterior wall to the end of the elbow as shown in Figure a)
7.21.
Add 2-1/8” to distance “L”. Carefully mark this length on the pipe as shown in Figure 7.22.b)
Press in the two tabs holding the plastic terminal in the terminal section (Figure 7.22). Carefully pull out the c)
terminal and the inner pipe.
Cut the d) outer pipe only at the point marked in Step (b) using aviation shears, a hacksaw, or an abrasive
wheel cutter. Be careful to cut the pipe square. De burr the cut end with a fi le or emery cloth.
Cut the plastic inner pipe so that it will protrude 3/8” beyond the outer pipe when reinstalled in the terminal e)
section (Figure 7.23). Use a fi ne tooth hacksaw or a PVC saw to cut the plastic pipe and be careful to cut the
pipe square. De burr the cut edge of the plastic pipe with a fi le, razor blade, or fi ne sandpaper.
Reinstall the inner pipe in the terminal section. Slip the outside wall grommet over the terminal section and f)
position so that it covers the joint between the outer pipe and the terminal (Figure 7.24).
Make a mark on the terminal section 1” from the cut end of the outer pipe as shown in Figure 7.24.g)
Pass the terminal section through the wall from the outside. Push the remaining wall grommet over the h)
terminal section on the inside of the wall. Push the terminal section into the elbow until the mark made in Step
(g) is no longer visible. If necessary , the brown gasket in the inner pipe may be lubricated with a few drops of
water.
The terminal section must be attached to the elbow with a single #10 x 1/2” sheet metal screw ( not supplied) i)
at the top of the elbow. Drill a 1/8” hole in the location shown in Figure 7.25. Use a short drill bit or a drill
stop to ensure that the drill bit does not penetrate the pipe by more than 3/8”. Install a #10 x 1/2” screw
in this hole. Do not use a screw longer than 1/2” long.
If not already done, make sure that both wall grommets are fi rmly against the interior and exterior wall j)
surfaces. Seal any cracks or other openings near the terminal through which exhaust could enter the building.
Figure 7.20. For Vent Option 1, install the
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FIGURE 7.20: INSTALLATION OF 60/100 ADAPTORS ON BOILER
FIGURE 7.21: DIMENSION “L”
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If additional pieces of pipe are used, install them starting at the boiler elbow. Support each section of straight pipe 4)
at its female end.
Use locking bands provided to join adjacent sections of non-cuttable pipe as well as fi ttings. The male end of the 5)
terminal section and other cuttable sections must be held to the female end of the adjoining pipe with at least
three #10 x 1/2” sheet metal screws. Drill a 1/8 hole through both outer pipes to start this screw. Use a drill stop
or other means to ensure that the drill bit does not penetrate more than 3/8” into the outer pipe. Do not
use a sheet metal screw longer than 1/2”.
The only straight pipe that can be cut is the terminal section and the 19-1/2” section (Crown PN 230506). To cut 6)
this pipe:
Cut pipe from the male end. After marking the desired length of the outer pipe, remove the plastic inner pipe a)
by pulling it out from the female end.
Cut the b) outer pipe only at the point marked in Step (b) using aviation shears, a hacksaw, or an abrasive
wheel cutter. Be careful to cut the pipe square. De burr the cut end with a fi le or emery cloth.
Cut the plastic inner pipe so that it will protrude 3/8” beyond the outer pipe when reinstalled in the outer pipe. c)
Use a fi ne tooth hacksaw or a PVC saw to cut the plastic pipe and be careful to cut the pipe square. De burr
the cut edge of the plastic pipe with a fi le, razor blade, or fi ne sandpaper.
Reinstall the inner pipe.d)
Install the terminal as outlined in Step (4) above. Dimension “L” described in Step 3 is the distance from the 7)
exterior surface of the wall to the end of the last piece of pipe inside the building.
Figure 7.22: Cutting Outer Pipe
Figure 7.23: Cutting Inner Pipe
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Figure 7.24: Preparing 60/100mm Terminal Section For Installation In The Wall
Figure 7.25: Attaching 60/100mm Terminal Section
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D. Assembly of Crown 80/125mm Concentric Venting
(IMPORTANT - See Section C for 60/100mm Concentric V ent Assembly)
WARNING
Failure to follow the instructions could result in fl ue gas leakage into the combustion air or indoor
air, resulting in unsafe or unreliable operation.
• Do not lubricate concentric gaskets with anything other than water.
• Do not attempt to cut any piping except as permitted in this section. When cutting these
sections, make sure all cuts are square and allow for proper insertion.
• Do not attempt to try to mix this concentric pipe with other venting systems.
The 60/100mm terminal section and concentric reducing elbow supplied with the boiler are not used in 1)
80/125mm vent systems. The components listed in Table 7.3b are required for 80/125mm installations and
are not supplied with the boiler. Before starting assembly of an 80/125mm vent system, make sure that
the planned installation is in accordance with the “Vent System Design” section of this manual and that
all required 80/125mm vent components are on hand. These components are available through Crown
distributors.
Figure 7.30: Installation Of 80/125 Adaptor On Boiler
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Installation of the MWC1 16 with 80/125mm venting requires the use of the 80/125mm appliance adaptor 2)
(Crown PN 340523). This adaptor is installed on top of the boiler as shown in Figure 7.30. For vent options 3
and 5, sandwich the 82mm air inlet orifi ce between the boiler and the adaptor as shown.
Cutting Straight Pipe3) - The following straight pipe sections may be cut:
Part # Description
230517 19 1/2” Straight
230515 39” Straight
These sections have a plain male end (without beads - see Figure 7.31a). They are always cut from the
male end. Sections not shown on the above list may not be cut. These sections have beads on the male end
(Figure 7.31b).
Figure 7.31a: Cuttable Straight Section
Figure 7.31b: Non Cuttable Straight Section
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