Crown Boiler MWC Series Manuel utilisateur
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 qualied 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: (215) 535-8900 • Fax: (215) 535-9736 • 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
3
Figure 1.1: MWC Boiler Principle Components
4
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
5
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
Ce manuel convient aux modèles suivants
4
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