16
REMOVING BOILERS
Should you wish to remove your boiler(s) we can supply blanking plugs, fire boards and a new baffle. If the roof
boiler is to be removed/replaced please quote Stove Model and choice of canopy required. Should you wish to
add or change boilers - for the available sizes and outputs, contact your dealer or us for advice.
PIPE THERMOSTATS
Every stove with boilers intended for more than domestic hot water should have an indirect copper cylinder, a
central heating circulating pump and at least 30% of the heating load should thermo-syphon/gravitate to protect
the system in the event of a electrical power failure or circulating pump failure. There should be three essential
devices fitted to maintain safety, longevity of boilers and to comply with the guarantee conditions of Woodwarm
Stoves.
1
A high temperature Pipe Thermostat.
This is clamped on to the main 28mm gravity flow water pipe and switches the pump on when the boilers/pipe
temperature rises. It should be set at between 85
o
C and 95
o
C and thus ensures that the copper Cylinder hot water
does not boil but is dissipated safely around the radiator circuit.
2
A low temperature Pipe Thermostat.
This is clamped on to the main 28mm return pipe and should be set at between 45
o
C and 55
o
C and thus switches
the pump off when the temperature of the water returning from the system/hot water copper Cylinder to the
boilers begins to fall. It ensures that
cold water does not
circulate through the stove boilers and the circuit as
this would:-
a. Allow the heating circuit to rob the heat from the hot water copper Cylinder
b. Cause acid condensation to form on the boilers inside the stove and them to fail early
c. Create a cold flue/chimney and the associated condensation/tar problems
The objective is to have a continuous circuit of warm-hot water circulating from the boilers in the stove to the
copper cylinder and when the pump is on, continuing this around the radiators. Therefore the stove must be run at
a sufficiently hot temperature to sustain this. It is important that the boilers' output, as in the General
Specifications, is enough to do this and calculations should also take into account the kilowatt room output of the
stove when the boilers have been fitted.
Connections
- Common
- Break on Rise
- Make on Rise
2
1
C
Neutral
High
Limit
90
o
C
Low
Limit
50
o
C
A
B
Line
Pump
C
C
1
1
2
2
Diagram 11
3
A Injection Tee
To prevent the 70% of the central heating load from gravitating around the radiator circuit and creating cold water
problems (as under 2a & 2b above) when the circulation pump is off.
Pipe Thermostats - Wiring Diagram
If time clock and/or room thermostats are to are fitted
then remove the link between A & B and replace it
with the device.
NB. Time clocks and room thermostats are only
appropriate for Woodwarm Stoves which have an
Aquastat Control fitted.