DB15
INSTALLATION AND OPERATING INSTRUCTIONS
10
11
DB15
INSTALLATION AND OPERATING INSTRUCTIONS
WATER SYSTEM CONNECTIONS
Outlines of some possible installation schemes are
shown here. In both of them:
●Possible boiling is safely accommodated by a
vent pipe leading directly to an open feed and
expansion tank.
●A c50°C low-level thermostat brings the pumped
system 'on' only when the fire is hot. It prevents
stored hot water from being depleted and cold
water chilling the boiler. Vital to prevent corrosion.
●A c90°C thermostat can close to override all
other controls and operate the central heating
pump to dissipate heat if there is a risk of boiling.
●There are time and room-temperature controls
controlling the central-heating pump.
●Hot water for taps is not separately controlled, it
may become scalding hot - consider fitting a
thermostatic mixing valve.
●An electric immersion heater is provided for
summer hot water.
Temperatures are approximate and will vary.
Scheme 1: TRADITIONAL 2-SIDE
Compact and quick to heat. Stores hot water
for taps, but radiators will go cold if the fire
goes out. Recommended for occasional use or
where long-burning mineral fuels are used.
One side of the boiler feeds, by gravity circulation
alone, an indirect coil to heat a hot-water storage
cylinder and has feed and vent connections to a
small open expansion tank. (Gravity piping
requires careful calculation but will generally be
at
least
28mm diameter, rise continually and have a
horizontal distance from the boiler of no more than
its vertical distance above it.)
The other side of the boiler connects to the
pumped central heating circuit, which activates
only when a time-clock, room thermostat and
c50°C pipe thermostat (on the domestic hot-water
side flow pipe near to the boiler), are all 'closed'.
A second electrical supply feeds a pipe thermostat
on the flow pipe to domestic water very near to the
boiler and set to close above c90°C, such that if
there is risk of boiling the central-heating pump will
always operate to dissipate heat.
Scheme 2: THERMAL STORE
A large body of water is stored at a high
temperature, to supply both taps and central
heating when needed. High and low output
phases are evened-out; heating can operate
even if the fire is out, eg, next morning.
Recommended for all uses, and always where wood is the main fuel.
In one system, a 'combined' thermal store or 'heat bank' of about 300 litre capacity is directly heated by the boiler and has an indirect
coil [1] in its highest (hottest) part to supply tap water, below which the central-heating flow is taken-off as needed.
Pump (P1) circulates hot water from the boiler to the store only when a pipe thermostat on the boiler flow pipe is above c50°C. The,
separate, central heating pump (P2) operates only when the time-clock, room
thermostat and a second c50°C thermostat responsive to temperature in the store, are
all 'closed'. A second thermostat towards the top of the store closes at c90°C to
dissipate heat if there is risk of boiling.
Extra indirect coils may be provided at [2] to accommodate a supply from a second
central-heating boiler, and at [3] to receive relatively low-grade heat from solar panels.
LINK-UP TO ANOTHER BOILER
Your stove can be linked into an oil or gas central heating system and operate
completely automatically. One method is to use a thermal store system, like Scheme 2
above, with a separate coil (for pressurised boilers) or extra direct connections (for
open-vent boilers).
Another method uses a 'neutral point manifold' where both boilers are connected to the
manifold, which is in turn connected to the hot water and radiator circuits. Suitable
devices come from
www.esse.com
and
www.systemlink.ie
.
2
Scheme 1:
Traditional 2-side system with gravity hot water.
Recommended where mineral fuels are mainly to be used
Scheme 2:
Thermal store system.
Recommended for all uses, and always where wood is the main fuel.
Outline of multiple boiler Link-Up using a neutral-point
manifold
WATER SYSTEM CONNECTIONS
Outlines of some possible installation schemes are
shown here. In both of them:
●Possible boiling is safely accommodated by a
vent pipe leading directly to an open feed and
expansion tank.
●A c50°C low-level thermostat brings the pumped
system 'on' only when the fire is hot. It prevents
stored hot water from being depleted and cold
water chilling the boiler. Vital to prevent corrosion.
●A c90°C thermostat can close to override all
other controls and operate the central heating
pump to dissipate heat if there is a risk of boiling.
●There are time and room-temperature controls
controlling the central-heating pump.
●Hot water for taps is not separately controlled, it
may become scalding hot - consider fitting a
thermostatic mixing valve.
●An electric immersion heater is provided for
summer hot water.
Temperatures are approximate and will vary.
Scheme 1: TRADITIONAL 2-SIDE
Compact and quick to heat. Stores hot water
for taps, but radiators will go cold if the fire
goes out. Recommended for occasional use or
where long-burning mineral fuels are used.
One side of the boiler feeds, by gravity circulation
alone, an indirect coil to heat a hot-water storage
cylinder and has feed and vent connections to a
small open expansion tank. (Gravity piping
requires careful calculation but will generally be
at
least
28mm diameter, rise continually and have a
horizontal distance from the boiler of no more than
its vertical distance above it.)
The other side of the boiler connects to the
pumped central heating circuit, which activates
only when a time-clock, room thermostat and
c50°C pipe thermostat (on the domestic hot-water
side flow pipe near to the boiler), are all 'closed'.
A second electrical supply feeds a pipe thermostat
on the flow pipe to domestic water very near to the
boiler and set to close above c90°C, such that if
there is risk of boiling the central-heating pump will
always operate to dissipate heat.
Scheme 2: THERMAL STORE
A large body of water is stored at a high
temperature, to supply both taps and central
heating when needed. High and low output
phases are evened-out; heating can operate
even if the fire is out, eg, next morning.
Recommended for all uses, and always where wood is the main fuel.
In one system, a 'combined' thermal store or 'heat bank' of about 300 litre capacity is directly heated by the boiler and has an indirect
coil [1] in its highest (hottest) part to supply tap water, below which the central-heating flow is taken-off as needed.
Pump (P1) circulates hot water from the boiler to the store only when a pipe thermostat on the boiler flow pipe is above c50°C. The,
separate, central heating pump (P2) operates only when the time-clock, room
thermostat and a second c50°C thermostat responsive to temperature in the store, are
all 'closed'. A second thermostat towards the top of the store closes at c90°C to
dissipate heat if there is risk of boiling.
Extra indirect coils may be provided at [2] to accommodate a supply from a second
central-heating boiler, and at [3] to receive relatively low-grade heat from solar panels.
LINK-UP TO ANOTHER BOILER
Your stove can be linked into an oil or gas central heating system and operate
completely automatically. One method is to use a thermal store system, like Scheme 2
above, with a separate coil (for pressurised boilers) or extra direct connections (for
open-vent boilers).
Another method uses a 'neutral point manifold' where both boilers are connected to the
manifold, which is in turn connected to the hot water and radiator circuits. Suitable
devices come from
www.esse.com
and
www.systemlink.ie
.
2
Scheme 1:
Traditional 2-side system with gravity hot water.
Recommended where mineral fuels are mainly to be used
Scheme 2:
Thermal store system.
Recommended for all uses, and always where wood is the main fuel.
Outline of multiple boiler Link-Up using a neutral-point
manifold
WATER SYSTEM CONNECTIONS
Outlines of some possible installation schemes are
shown here. In both of them:
●Possible boiling is safely accommodated by a
vent pipe leading directly to an open feed and
expansion tank.
●A c50°C low-level thermostat brings the pumped
system 'on' only when the fire is hot. It prevents
stored hot water from being depleted and cold
water chilling the boiler. Vital to prevent corrosion.
●A c90°C thermostat can close to override all
other controls and operate the central heating
pump to dissipate heat if there is a risk of boiling.
●There are time and room-temperature controls
controlling the central-heating pump.
●Hot water for taps is not separately controlled, it
may become scalding hot - consider fitting a
thermostatic mixing valve.
●An electric immersion heater is provided for
summer hot water.
Temperatures are approximate and will vary.
Scheme 1: TRADITIONAL 2-SIDE
Compact and quick to heat. Stores hot water
for taps, but radiators will go cold if the fire
goes out. Recommended for occasional use or
where long-burning mineral fuels are used.
One side of the boiler feeds, by gravity circulation
alone, an indirect coil to heat a hot-water storage
cylinder and has feed and vent connections to a
small open expansion tank. (Gravity piping
requires careful calculation but will generally be
at
least
28mm diameter, rise continually and have a
horizontal distance from the boiler of no more than
its vertical distance above it.)
The other side of the boiler connects to the
pumped central heating circuit, which activates
only when a time-clock, room thermostat and
c50°C pipe thermostat (on the domestic hot-water
side flow pipe near to the boiler), are all 'closed'.
A second electrical supply feeds a pipe thermostat
on the flow pipe to domestic water very near to the
boiler and set to close above c90°C, such that if
there is risk of boiling the central-heating pump will
always operate to dissipate heat.
Scheme 2: THERMAL STORE
A large body of water is stored at a high
temperature, to supply both taps and central
heating when needed. High and low output
phases are evened-out; heating can operate
even if the fire is out, eg, next morning.
Recommended for all uses, and always where wood is the main fuel.
In one system, a 'combined' thermal store or 'heat bank' of about 300 litre capacity is directly heated by the boiler and has an indirect
coil [1] in its highest (hottest) part to supply tap water, below which the central-heating flow is taken-off as needed.
Pump (P1) circulates hot water from the boiler to the store only when a pipe thermostat on the boiler flow pipe is above c50°C. The,
separate, central heating pump (P2) operates only when the time-clock, room
thermostat and a second c50°C thermostat responsive to temperature in the store, are
all 'closed'. A second thermostat towards the top of the store closes at c90°C to
dissipate heat if there is risk of boiling.
Extra indirect coils may be provided at [2] to accommodate a supply from a second
central-heating boiler, and at [3] to receive relatively low-grade heat from solar panels.
LINK-UP TO ANOTHER BOILER
Your stove can be linked into an oil or gas central heating system and operate
completely automatically. One method is to use a thermal store system, like Scheme 2
above, with a separate coil (for pressurised boilers) or extra direct connections (for
open-vent boilers).
Another method uses a 'neutral point manifold' where both boilers are connected to the
manifold, which is in turn connected to the hot water and radiator circuits. Suitable
devices come from
www.esse.com
and
www.systemlink.ie
.
2
Scheme 1:
Traditional 2-side system with gravity hot water.
Recommended where mineral fuels are mainly to be used
Scheme 2:
Thermal store system.
Recommended for all uses, and always where wood is the main fuel.
Outline of multiple boiler Link-Up using a neutral-point
manifold
WATER SYSTEM CONNECTIONS
Outlines of some possible installation
schemes are shown here.
In both of them:
- Possible boiling is safely accommodated
by a vent pipe leading directly to an open
feed and expansion tank.
- A c50°C low-level thermostat brings the
pumped system ‘on’ only when the fire
is hot. It prevents stored hot water from
being depleted and cold water chilling
the boiler. Vital to prevent corrosion.
- A c90°C thermostat can close to override
allother controls and operate the central
heating pump to dissipate heat if there is
a risk of boiling.
- There are time and room-temperature
controls controlling the central-heating pump.
- Hot water for taps is not separately
controlled, it may become scalding hot -
consider fitting a thermostatic mixing valve.
- An electric immersion heater is provided
for summer hot water. Temperatures are
approximate and will vary.
SCHEME 1: TRADITIONAL 2-SIDE
LINK-UP TO ANOTHER BOILER
Compact and quick to heat.
Stores hot water for taps, but
radiators will go cold if the fire
goes out. Recommended for
occasional use or where long-
burning mineral fuels are
used. One side of the boiler
feeds, by gravity circulation
alone, an indirect coil to heat a
hot-water storage cylinder and
has feed and vent connections
to a small open expansion
tank. (Gravity piping requires
careful calculation but will
generally be at least 28mm
diameter, rise continually and
have a horizontal distance from
the boiler of no more than its
vertical distance above it.)
The other side of the boiler
Your stove can be linked
into an oil or gas central
heating system and operate
completely automatically.
One method is to use a
thermal store system,
like Scheme 2 above,
with a separate coil (for
pressurised boilers) or
extra direct connections
(for open-vent boilers).
Another method uses a
‘neutral point manifold’ where
both boilers are connected
to the manifold, which is in
turn connected to the hot
water and radiator circuits.
Suitable devices come from
www.esse.com and
www.systemlink.ie.
connects to the pumped
central heating circuit, which
activates only when a time-
clock, room thermostat and
c50°C pipe thermostat (on the
domestic hot-waterside flow
pipe near to the boiler), are all
‘closed’. A second electrical
supply feeds a pipe thermostat
on the flow pipe to domestic
water very near to the boiler
and set to close above c90°C,
such that if there is risk of
boiling the central-heating
pump will always operate to
dissipate heat.
WATER SYSTEM CONNECTIONS
Outlines of some possible installation schemes are
shown here. In both of them:
●Possible boiling is safely accommodated by a
vent pipe leading directly to an open feed and
expansion tank.
●A c50°C low-level thermostat brings the pumped
system 'on' only when the fire is hot. It prevents
stored hot water from being depleted and cold
water chilling the boiler. Vital to prevent corrosion.
●A c90°C thermostat can close to override all
other controls and operate the central heating
pump to dissipate heat if there is a risk of boiling.
●There are time and room-temperature controls
controlling the central-heating pump.
●Hot water for taps is not separately controlled, it
may become scalding hot - consider fitting a
thermostatic mixing valve.
●An electric immersion heater is provided for
summer hot water.
Temperatures are approximate and will vary.
Scheme 1: TRADITIONAL 2-SIDE
Compact and quick to heat. Stores hot water
for taps, but radiators will go cold if the fire
goes out. Recommended for occasional use or
where long-burning mineral fuels are used.
One side of the boiler feeds, by gravity circulation
alone, an indirect coil to heat a hot-water storage
cylinder and has feed and vent connections to a
small open expansion tank. (Gravity piping
requires careful calculation but will generally be
at
least
28mm diameter, rise continually and have a
horizontal distance from the boiler of no more than
its vertical distance above it.)
The other side of the boiler connects to the
pumped central heating circuit, which activates
only when a time-clock, room thermostat and
c50°C pipe thermostat (on the domestic hot-water
side flow pipe near to the boiler), are all 'closed'.
A second electrical supply feeds a pipe thermostat
on the flow pipe to domestic water very near to the
boiler and set to close above c90°C, such that if
there is risk of boiling the central-heating pump will
always operate to dissipate heat.
Scheme 2: THERMAL STORE
A large body of water is stored at a high
temperature, to supply both taps and central
heating when needed. High and low output
phases are evened-out; heating can operate
even if the fire is out, eg, next morning.
Recommended for all uses, and always where wood is the main fuel.
In one system, a 'combined' thermal store or 'heat bank' of about 300 litre capacity is directly heated by the boiler and has an indirect
coil [1] in its highest (hottest) part to supply tap water, below which the central-heating flow is taken-off as needed.
Pump (P1) circulates hot water from the boiler to the store only when a pipe thermostat on the boiler flow pipe is above c50°C. The,
separate, central heating pump (P2) operates only when the time-clock, room
thermostat and a second c50°C thermostat responsive to temperature in the store, are
all 'closed'. A second thermostat towards the top of the store closes at c90°C to
dissipate heat if there is risk of boiling.
Extra indirect coils may be provided at [2] to accommodate a supply from a second
central-heating boiler, and at [3] to receive relatively low-grade heat from solar panels.
LINK-UP TO ANOTHER BOILER
Your stove can be linked into an oil or gas central heating system and operate
completely automatically. One method is to use a thermal store system, like Scheme 2
above, with a separate coil (for pressurised boilers) or extra direct connections (for
open-vent boilers).
Another method uses a 'neutral point manifold' where both boilers are connected to the
manifold, which is in turn connected to the hot water and radiator circuits. Suitable
devices come from
www.esse.com
and
www.systemlink.ie
.
2
Scheme 1:
Traditional 2-side system with gravity hot water.
Recommended where mineral fuels are mainly to be used
Scheme 2:
Thermal store system.
Recommended for all uses, and always where wood is the main fuel.
Outline of multiple boiler Link-Up using a neutral-point
manifold
SCHEME 2: THERMAL STORE
A large body of water is
stored at a high temperature,
to supply both taps and
central heating when needed.
High and low output phases
are evened-out; heating
can operate even if the fire
is out, eg, next morning.
Recommended for all uses,
and always where wood is
the main fuel. In one system,
a ‘combined’ thermal store
or ‘heat bank’ of about 300
litre capacity is directly
heated by the boiler and
has an indirect coil [1] in
its highest (hottest) part
to supply tap water, below
which the central-heating
flow is taken-off as needed.
Pump (P1) circulates hot
water from the boiler to
the store only when a pipe
thermostat on the boiler
flow pipe is above c50°C.
The separate, central
heating pump (P2) operates
only when the time-clock,
room thermostat and a
second c50°C thermostat
responsive to temperature in
the store, areall ‘closed’.
A second thermostat towards
the top of the store closes
at c90°C to dissipate heat
if there is risk of boiling.
Extra indirect coils may
be provided at [2] to
accommodate a supply from
a second central-heating
boiler, and at [3] to receive
relatively low-grade heat
from solar panels.
(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.
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
1
2
3
4
5
6
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
62
70
78
86
94 102
Moderate insulation
eg: thick solid walls, some loft insulation, some draught-proofing
31
35
40
44
48
53
Good Insulation
eg: some wall insulation, thick loft insulation, double glazing, draught-proofing
21
24
27
31
34
37
Best insulation
eg: properties built to 2008 UK standards
16
18
20
22
24
26
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.
1
Copyright © and UK Design Right, Glyn Hughes 2006-2013.
'Teddington' thermostat
(Normal cold '0' setting - about 7mm open)
Typical wiring layout through connector block (return dotted)
Room and boiler outputs vary together
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
1
2
3
4
5
6
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
62
70
78
86
94 102
Moderate insulation
eg: thick solid walls, some loft insulation, some draught-proofing
31
35
40
44
48
53
Good Insulation
eg: some wall insulation, thick loft insulation, double glazing, draught-proofing
21
24
27
31
34
37
Best insulation
eg: properties built to 2008 UK standards
16
18
20
22
24
26
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.
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Copyright © and UK Design Right, Glyn Hughes 2006-2013.
'Teddington' thermostat
(Normal cold '0' setting - about 7mm open)
Typical wiring layout through connector block (return dotted)
Room and boiler outputs vary together
Typical wiring layout through
connector block (return dotted)
‘Teddington’ thermostat (Normal
cold ‘0’ setting - about 7mm open)
Scheme 1: Traditional 2-side system with gravity hot water.
Recommended where mineral fuels are mainly to be used
Scheme 2: Thermal store system. Recommended for
all uses, and always where wood is the main fuel.
Outline of multiple boiler Link-Up using
a neutral-point manifold
