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 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: (215) 535-8900 • Fax: (215) 535-9736 • www.crownboiler.com

E S I G N E D T O

E A D

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

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

Figure 1.1: MWC Boiler Principle Components

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

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

Figure 4.1: Clearances To Combustible Or Non-combustible Material

Clearance From

Hot Water Pipes To

Combustibles = 1”

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)

Figure 5.1 Wall Mounting Hole Locations

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