Revised 11-07-11
A heat soak radiator of at least 2kW must be used on the same gravity circuit, positioned above
the stove. This is used to dissipate heat when the central heating is switched off or the HW
cylinder is fully heated.
Link Up:
On heating and hot water installations, a semi-pumped system should be used to the central
heating system with gravity circulation to the hot water cylinder. For optimum performance of
the boiler we recommend that all 4 tappings are used when using separate gravity and pumped
heating loops. The flow and return pipes should be taken from diagonally opposite sides of
boiler.
Injector Tee:
If only two tappings are used on a common flow system, they should be taken diagonally
opposite and the remaining tappings should be plugged. An injector Tee should be fitted to join
the gravity feed and central heating circuits back to the stove, which should be situated as close
to the stove as possible. The tee connection encourages the stable flow of water through both
circuits and prevents priority being given to the stronger flow, typically the pumped circuit.
Pipe Thermostats
A HIGH LIMIT thermostat should be fitted to the gravity flow pipe close to the boiler and set at
90°C.This should override any pump control, switching the pump on and dissipating any excess
heat around the radiator circuit. To prevent boiler corrosion due to condensation it is necessary to
maintain the return water temperature above 45°C. This can be achieved by the use of a
LOWLIMIT thermostat on the return pipe from the hot water cylinder, close to the boiler. The
thermostat should make on temperature rise, preventing the circulating pump from operating
until the gravity circuit is up to temperature.
Commissioning and Handover
Upon completion of the installation, allow a suitable period of time for any fire cement and
mortar to dry out. A small fire may then be lit and checked to ensure the smoke and fumes are
taken from the stove up the chimney and emitted safely to atmosphere. Do not run the stove at
full output for at least 3 – 4 days.
On completion of the installation and commissioning, ensure that the operating instructions and
operating tools for the stove are left with the customer. Ensure to advise the customer on the
correct use of the appliance with the fuels likely to be used on the stove and warn them to use
only the recommended fuels for the stove.
Advise the user on what to do should smoke or fumes be emitted from the stove. The user
should use a suitable fireguard in the presence of children, aged and/or infirm persons.
All connections to the boiler should be checked to ensure there are no leaks during operation and
that the flow and return water connections are working properly. The stove should be fired up
initially by the Plumber / Heating Engineer to ensure that it is operating safely with the rest of
the heating system.