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DB15

INSTALLATION AND OPERATING INSTRUCTIONS

DB15

INSTALLATION AND OPERATING INSTRUCTIONS

PARTS AND ACCESSORIES

Standard Spare Parts for Morso DB15 Central Heating Stove

to be emitted from the chimney, especially when the fire is cold.
Use only VERY dry wood or smokeless fuels. Is the chimney high
enough and hot enough to generate the necessary 12Pa draught?

POOR HEAT OUTPUT:

This appliance is

very easily

capable of

producing the quoted heat outputs given suitable fuels and a
chimney capable of developing sufficient draught. Is the chimney
too short or becoming cool or damp? Is the fuel completely dry?
Have the central controls been set correctly? Is the building
sufficiently well insulated?

CONDENSATION

onto cool surfaces inside the stove can be

severe if fuel is in any way damp.

Use only very dry fuel.

It is vital

that the heating circuit is fitted with a device, such as a low-limit
thermostat, to minimise cold water circulating through the boiler.

SMOKE COMING INTO ROOM

A little smoke leaking into the

room   during   refuelling   is   normal,   but   fumes   are   poisonous   and
recurrent   smoke   emission   must   NEVER   be   tolerated,   causes
might be:
NEW STOVE: There is often a smell and sometimes visible fumes
as the paint cures. This normally stops after an hour or so.
INADEQUATE   SEALS:   Are   all   flue   pipes   and   connectors

absolutely

gas-tight? Even the tiniest crack or gap can spoil the

draught. Does an inset appliances fully seal against the fireplace?
BLOCKED   FLUEWAYS:   Has   soot   and   ash   collected   above   the
inner back part of the firebox?
UNSUITABLE,   BLOCKED   OR   UN-SWEPT   CHIMNEY:   The   first
requirement for correct operation is a sound chimney. Check the
requirements  earlier   in   this  document  and   in  any  case   of   doubt
engage a professional sweep or chimney engineer.
POOR AIR SUPPLY: Lack of air to the fire is a common cause of
smoking   and   poor   performance.   Air   supply   problems   may   be
worse   in   certain   wind   conditions   (often   incorrectly   ascribed   to
'downdraught', which is in fact very rare), where air can be sucked
out of the room. The answer is to fit an air vent, as near to the fire
as possible, facing into the usual wind direction.

DOWNDRAUGHT: Wind can blow

down

a chimney if there is

something higher nearby such as a tree, hill or high building.
Fitting an anti-downdraught cowl to the chimney top can cure this.
Types which cannot be swept through are not recommended.
POOR CHIMNEY DRAUGHT- Chimney draught in use MUST be
at least 12Pa.

CHIMNEY FIRE:

In the rare event of deposits inside the chimney

igniting (roaring sound + dense smoke and sparks from the
chimney) immediately close the door, shut all air controls and call
the fire brigade. Prevent fires by using

very dry fuel

and having

your chimney swept regularly.

MAINTENANCE

MONTHLY

- Open the fire door and inspect the top flue passages.

Gain access for cleaning by using the tool to lift off the lid (B on the
diagram).

ANNUALLY- SWEEP THE CHIMNEY

The entire length of the

chimney from stove to outlet should be swept annually, more often
if smoky fuels are used.

NEW PARTS

Your stove has been extensively tested for safety -

please don't try to modify it and always obtain genuine spare parts

SURFACE FINISH

Wipe the stove body with a slightly damp cloth

when cool. NEVER use aerosol spray or wax near the hot fire –
they can ignite. Painted steel parts can be refurbished using
special spray paint.

Your stove generates

VERY

high temperatures. Eventually the

internal parts will require replacement . Help parts to last by:

●Using only recommend, very dry, fuels.
●Emptying the ash very regularly when using mineral fuel -never

allow it to touch the underside of the grate.

●Cleaning the flueways regularly.
●Avoiding 'over-firing'

PARTS AND ACCESSORIES

Standard Spare Parts for Morso DB15 Central Heating Stove

Part Number

Window

MOR0029

Front firebar

MOR0030

Riddling bar

MOR0031

Thermostat assembly

MOR0032

Roof brick, pair, with seals

MOR0033

Side Brick, pair, with seals

MOR0034

Mid Brick, with seals

MOR0035

Firebar, upper

MOR0036

Firebar, lower

MOR0037

Ashpan

MOR0038

Touch-up paint

MOR0039

Operating tool

MOR0040

Rope Seal kit

MOR0041

Mineral fibre seals between bricks

MOR0042

Morso UK Ltd, Unit 7, The I O Centre, Valley Drive, Rugby, Warwickshire, CV21 1TW UK

These stove designs are registered at the UK Patent Office, Design No 4030575 and others, and are protected by Copyright © and UK Design Right, Glyn Hughes 2006-2013.
Certain parts are UK Patent Applied For. This document printed 10/09/2013. We are always striving to improve these products and may change their specification without notice.

KEY

SPARE PART

PART NUMBER

WINDOW

MOR0029

FRONT FIREBAR

MOR0032

RIDDLING BAR

MOR0031

THERMOSTAT ASSEMBLY

MOR0032

ROOF BRICK, PAIR, WITH SEALS

MOR0033

SIDE BRICK, PAIR, WITH SEALS

MOR0034

MID BRICK, WITH SEALS

MOR0035

FIREBAR, UPPER

MOR0036

FIREBAR, LOWER

MOR0037

ASHPAN

MOR0038

TOUCH-UP PAINT

MOR0039

OPERATING TOOL

MOR0040

ROPE SEAL KIT

MOR0041

MINERAL FIBRE SEALS BETWEEN BRICKS

MOR0042

1. CONTROL THE

HEATING SYSTEM

Stove boilers control their

own water temperature

by an internal thermostat,

so controls such as time

clocks and thermostats

regulate flow through the

heating circuit, not

the boiler.

2. GUARD AGAINST

CONDENSATION!

Solid fuels contain water

which can condense on

cool boiler faces to cause

VERY rapid corrosion and

failure. Use very dry fuel

and always fit a device such

BOILER STOVE CENTRAL HEATING SYSTEMS

This is a rough guide to specifying and fitting central heating using a solid fuel boiler stove with
thermostatic control. It doesn’t cover every detail, which will need to be determined on-site by
a skilled heating engineer.
‘Wet’ solid fuel central heating systems use the same types of pipework (including microbore,
plastic) and heat emitters (radiators, underfloor, etc), as other fuels and they can likewise
come on in the morning, go off at night and regulate themselves. Systems must...

HEAT REQUIREMENT

CONTROLS

GET THE RIGHT SIZE HEATERS

Guesswork won’t do.

A preliminary estimate of heat

requirement for each room

can be got from the table here.

Example: A room 6m x 5m x

2.8m has volume of 84m³.

If it was a ground floor room

in the corner of a two-storey

house, in which the adjacent

rooms and the one above were

also heated, then 2 unheated

outsid 1 outside floor =

3 unheated faces.

If moderately insulated then

Your stove has a built-in
mechanical thermostat
to regulate its water
temperature. A tiny vial of
oil is fitted in the boiler.
As the boiler water gets
hotter, the oil expands
along a fine tube, moves
a bellow outward,moving
an arm, which closes off
air to the fuel and so slows
combustion. So, if the time
clock or room thermostat
determines that no heat
is needed, it stops the
circulating pump; without

BOILER STOVE CENTRAL HEATING SYSTEMS

This is a rough guide to specifying and fitting central heating using a solid fuel boiler stove with thermostatic control. It doesn't cover
every detail, which will need to be determined on-site by a skilled heating engineer.
'Wet' solid fuel central heating systems use the same types of pipework (including microbore, plastic) and heat emitters (radiators,
underfloor, etc), as other fuels and they can likewise come on in the morning, go off at night and regulate themselves. Systems must...

1: CONTROL THE HEATING SYSTEM.

Stove boilers control their own water temperature by an internal thermostat, so controls

such as time clocks and thermostats regulate flow through the heating circuit, not the boiler.

2: GUARD AGAINST CONDENSATION!

Solid fuels contain water which can condense on cool boiler faces to cause VERY rapid corrosion

and failure. Use

very

dry fuel and

always

fit a device such as a low-level thermostat to minimise cool water circulating through the boiler.

2: ALLOW FOR EXCESS HEAT.

The fire can close down automatically, but it can't

completely

stop combustion and output will vary

considerably during a fuelling cycle. There must be some infallible means of dissipating, and preferably storing, surplus heat, for instance a
hot water cylinder or a thermal store and always a system to run the central-heating pump if there is risk of boiling. Should thermostat and
pump fail together, there must be infallible provision to cool the system, or allow it to boil, for instance through an open vent. (The old-
fashioned idea of deliberately wasting heat through a permanent "heat leak" radiator not only throws heat away, it just will not suffice with
powerful modern stoves.)

HEAT REQUIREMENT

GET THE RIGHT SIZE HEATERS.

Guesswork won't do. A preliminary estimate of heat

requirement for each room can be got from the table here.

Example

: A room 6m x 5m x 2.8m

has volume of 84m³. If it was a ground floor room in the corner of a two-storey house, in
which the adjacent rooms and the one above were also heated, then 2 unheated outside
walls + 1 outside floor = 3 unheated faces. If moderately insulated then the factor in the table
is 40 Watts per m³, so 84m³ x 40 = 3360 Watts, or 3.36kW. A radiator, or radiators, emitting
at least 3.36kW should be specified.
Don't forget that, with boiler stoves, the room output and water output go up and down
together - turn the central heating down, and the whole stove goes cooler. It is usually wise to
fit a radiator (with thermostatic valve) in the fireplace room.
The actual value varies with the shape, exposure, draughtiness and temperatures. For larger
installations or whole-house heating, use the more accurate 'U-Value method - an online
heat-need calculator is available at

www.soliftec.com

APPROXIMATE HEAT REQUIREMENT OF ROOMS

Watts

per

Cubic Metre

Number of unheated faces

No effective insulation

eg: all-glass rooms with single glazing, barns, workshops, tents

120

132

145 158 170 183

Poor insulation

eg; single glazing, little loft insulation, uninsulated cavity walls, draughts

94 102

Moderate insulation

eg: thick solid walls, some loft insulation, some draught-proofing

Good Insulation

eg: some wall insulation, thick loft insulation, double glazing, draught-proofing

Best insulation

eg: properties built to 2008 UK standards

Watts (W) per cubic metre

CONTROLS

Your stove has a built-in
mechanical thermostat to
regulate

its

water

temperature. A tiny vial of oil
is  fitted  in  the  boiler.  As  the
boiler   water   gets   hotter,   the
oil expands along a fine tube,
moves   a   bellow   outward,
moving an arm, which closes
off   air   to   the   fuel   and   so
slows combustion. So, if the timeclock or room thermostat determines
that no heat is needed, it stops the circulating pump; without water
circulation the boiler begins to get too hot, the oil expands, shuts off
air and the fire dies down. If there is demand for heat, for instance in
the morning, the pump comes on, colder water enters the boiler, the
air-flap opens and the fire blazes up.

The control dial on the stove does not directly turn the stove up and
down, it sets the water temperature at which the thermostat will begin
to shut the fire down.

We recommend a control system regulating the central-heating pump through (1) a single-channel time clock, (2) a centrally-located
room thermostat (not in the stove room) and (3) thermostatic radiator valves on all but one radiator. A low-level (about 50°C) pipe
thermostat to prevent pumped circulation of cool water (which can cause condensation, rust, and deplete stored hot water) and a high
level one (about 90°C) to override controls and run the heating circuit to dissipate heat if there is a risk of boiling. Stored hot water for
taps is not controlled, but accumulates during normal operation, especially during periods while central heating is not required.

'Teddington' thermostat

(Normal cold '0' setting - about 7mm open)

Typical wiring layout through connector block (return dotted)

Room and boiler outputs vary together

the factor in the table is 40 Watts

per m³, so 84m³ x 40 = 3360 Watts,

or 3.36kW. A radiator, or

radiators, emitting at least

3.36kW should be specified.

Don’t forget that, with boiler

stoves, the room output and

water output go up and down

together - turn the central

heating down, and the whole

stove goes cooler.

It is usually wise to fit a

radiator (with thermostatic

valve) in the fireplace room.

The actual value varies

as a low-level thermostat

to minimise cool water

circulating through the boiler.

3. ALLOW FOR

EXCESS HEAT

The fire can close down

automatically, but it can’t

completely stop combustion

and output will vary considerably

during a fuelling cycle.

There must be some infallible

means of dissipating, and

preferably storing, surplus

heat, for instance a hot

water cylinder or a thermal

store and always a system

to run the central-heating

pump if there is risk of

boiling. Should thermostat

and pump fail together,

there must be infallible

provision to cool the system,

or allow it to boil, for

instance through an open

vent.

(The old-fashioned idea of

deliberately wasting heat

through a permanent “heat

leak” radiator not only

throws heat away, it just

will not suffice with powerful

modern stoves.)

APPROXIMATE HEAT REQUIREMENT OF ROOMS

Watts per Cubic Metre

NUMBER OF UNHEATED FACES

INSULA

TION

No effective insulation eg: all-glass rooms with single

glazing, barns, workshops, tents

120

132

145

158

170

183

Poor insulation eg; single glazing, little loft insulation,

uninsulated cavity walls, draughts

102

Moderate insulation eg: thick solid walls, some loft insulation,

some draught-proofing

Good Insulation eg: some wall insulation, thick loft insulation,

double glazing, draught-proofing

Best insulation eg: properties built to 2008 UK standards

WATTS (W) PER CUBIC METRE

water circulation the boiler
begins to get too hot, the oil
expands, shuts off air and
the fire dies down. If there
is demand for heat, for instance
in the morning, the pump
comes on, colder water
enters the boiler, the air-flap
opens and the fire blazes up.
The control dial on the stove
does not directly turn the
stove up and down, it sets
the water temperature at
which the thermostat will
begin to shut the fire down.