Morsø 7943 Installation And Operating Instructions Manual

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MORSØ JERNSTØBERI A/S . DK-7900 NYKØBING MORS

E-Mail: [e-mail] · Website: www.morsoe.com

A French version of the manual can be downloaded at www.morsona.com

Installation and Operating Instructions

7900 series

For use in North America

Read this entire manual before you install and use your new room heater. If this room heater is
not properly installed, a house fire may result. To reduce the risk of fire, follow the installation
instructions. Failure to follow instructions may result in property damage, bodily injury, or
even death.
Contact local building officials about restrictions and installation/inspection-requirements
in your area.

Save these instructions

Morsø 7943

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We congratulate you on your choice of a Morsø stove. Morsø has been
producing some of the world’s best stoves since 1853. If you follow this
installation- and operating instruction carefully, we can assure you
many years of warmth and pleasure.

Optional Accessories
A wide range of accessories (such as handling gloves, fireside tools, glass cleaner and heatproof
paint) are available for use with your Morsø stove. They help with day-to-day running and
maintenance. Contact your Morsø dealer for more information.

The Morsø 7900 series meets the U.S. Environmental Protection Agency’s emission limits for
wood heaters sold on or after July 1, 1990

The Morsø 7900 series have been tested by OMNI-Test Laboratories, Inc. The test standards are
UL1482-2011 for the United States and ULC-S627-00 for Canada.

The stove is listed for burning wood only. Do not burn other fuels.

Under specific test conditions this heater has been shown to deliver heat at rates ranging from
11 600 to 26 700 BTU/hr.

Cast iron
Cast iron is a live material. There are no two ovens that are identical. This is partly due to the
tolerances of the casting process, partly because the ovens are a work of craftsmanship.
Minor unevennesses may also occur in the cast iron surface.

CONTENTS:

1.0 Installation of your Morsø stove 4

1.1 Checking loose parts in the stove 4

1.2 The chimney / flue system 5

1.3 Flue Connection 6

1.4 Connection to existing chimney 6

1.5 Positioning the stove 8

1.6 Positioning the 7970 stove model 10

2.0 Operation 11

2.1 Before you start firing 11

2.2 Lighting and loading intervals 12

3.0 Maintenance 16

3.1 Exterior maintenance 16

3.2 Internal maintenance 16

3.3 Cleaning the stove and the flue 18

3.4 Leaving the stove for extended periods 20

3.5 Parts diagram 21

Portland
Oregon USA

Tested &
Listed By

OMNI-Test Laboratories, inc.
Report Number: 192-S-23-2

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CAUTION:DO NOT CONNECT TO OR USE IN CONJUNCTION WITH ANY AIR DISTRIBUTION
DUCTWORK UNLESS SPECIFICALLY APPROVED FOR SUCH INSTALLATION

Important: If the installation instructions are not followed carefully, it may cause
dangerous situations like chimney - and house fires. Follow the instructions
carefully and do not deviate from them as it may cause injuries to people or
property.

1.0 Installation of your Morsø stove

Installation of woodburning stoves must be safe and legal.

If your Morsø stove is not installed correctly, it may cause a house fire. To reduce
the risk of fire, the installation instructions must be followed carefully. Contact the
local building officials about restrictions and installation inspection in your area.

Before you start installing your stove, make sure that:

• The stove and chimney connection are placed far enough from combustible materials to
meet all clearance requirements.

• The floor protection must be adequate and must be made correctly according to the
requirements.

• All neccessary approvals are needed from the local building officials.

The data plate, which is located on the back of the stove, provides information regarding safety
testing information, name of certified testing laboratory, and installation requirements.
Installation requirements vary in different districts, and the local building officials have the final
authorization to approve your installation. You should discuss the installation with them before
beginning. Please ask your dealer for further information.

1.1 Checking loose parts in the stove

After unpacking, check that the fire bricks are firmly in position and have not shifted in transit.
Check also that the air control works freely.

Before starting the initial fire, make sure that the baffles is placed correctly.

Standard Accessories

A Morsø glove and ceramic flue connection gasket are standard accessories that usually can be
found in the ashpan or firebox area.

1.2 The chimney / flue system

Note that the flue system must be independently secured and must not rely on the stove for support.

DO NOT CONNECT THIS UNIT TO A CHIMNEY FLUE SERVING ANOTHER APPLIANCE

Use a residential type masonry or listed type HT factory-built chimney.

High Temperature (H.T.) Chimney Standard UL-103-1985 (2100º F.) or a code- approved
masonry chimney with flue liner for the USA, and High Temperature (650ºC) Standard
ULC S-629 for Canada.

The internal dimensions of the chimney connector and chimney must not be less than 6 inches
diameter (or equivalent cross section), and should not be significantly larger than this. Too large a
section will tend to allow the flue gases to cool excessively, causing sluggishness or unpredictability
in the stove’s performance.

We recommend the length of the chimney system should be at least 16 feet (not required) above
the stove in normal domestic situations, measured from the flue collar to the top of the chimney.
Local conditions like for example - roof constructions, large trees nearby and high altitude, may
influence the chimney draft and height. Therefore, contact the local professional chimney sweep
or your Morsø dealer.

Typical Factory-Built or Masonry Chimney Installations

CAUTION:DO NOT USE MAKE-SHIFT COMPROMISES DURING THE INSTALLATION OF THE
STOVE

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1.4 Connection to the existing chimney

A chimney connector is the double-wall or single-wall pipe that connects the stove to the chim­ney. The chimney itself is the masonry or prefabricated structure that encloses the flue. Chim­ney connectors are used only to connect the stove to the chimney.

Double-wall connectors must be tested and listed for use with solid-fuel burning appliances.
Single-wall connectors should be made of 24 gauge or heavier gauge steel. Do not use galvanized
connector; it cannot withstand the high-temperatures that smoke and exhaust gases can reach, and
may release toxic fumes under high heat. The connector must be 6 inches (150mm) in diameter.

If possible, do not pass the chimney connector through a combustible wall or ceiling.

If passage through a combustible wall is unavoidable, refer to the sections on Wall
Pass- Throughs. Do not pass the connector through an attic, a closet or similar
concealed space when installing the chimney connectors.

It is important to keep the flue gases moving smoothly in the right direction. Do not vent into a
large void at this location; rather form one continuous section all the way up. Use mild bends
(e.g. 45º vs. 90º) rather than sharp angles where a change of direction is required. All parts of
the venting must be accessible for cleaning purposes.
In horizontal runs of chimney, maintain a distance of 18 inches from the ceiling. Keep it as short
and direct as possible, with no more than two 90 degree turns. Slope horizontal runs of connector
upward 1/4 inch per foot (20 mm per metre) going from the stove toward the chimney. The
recommended maximum length of a horizontal run is 3 feet (1 metre), and the total length should
be no longer than 8 feet (2.5 metres).
Information on assembling and installing connectors is provided by the manufacturer’s instructions
exactly as you assemble the connector and attach it to the stove and chimney.

Be sure the installed stove and chimney connector are correct distances from near by
combustible materials. See the clearance paragraph page 8.

1.3 Flue Connection

The stove is supplied from the factory with a round blanking plate blocking off the top and rear
flue exit (behind the rear shield plate). A flue collar are placed in the firebox area.

Use a 24 MSG black or blue chimney connector or listed double wall chimney connector. Refer
to local codes and the chimney manufacturer’s instructions for precautions required for passing
a chimney through a combustible wall or ceiling. Remember to secure the chimney connector
with a minimum of three screws to the product and to each adjoining section.
The collar can be fitted to the rear outlet. Simply knock out the round panel on the rear heat shield
plate to reveal the cast iron plate. Untwist the blanking plate and the flue collar and swap their
positions. Re-secure by pushing down and tighten the enclosed screws.
Position the stove and connect to the flue system.

Wear gloves and protective eyewear when drilling, cutting or joining sections of chimney
connector

Where passage through a wall or partition of combustible construction is desired, the instal­lation shall conform to CAN/CSA-B365.