InisBofin Insert Boiler Multi-fuel Stove
26
short and vertical as possible, pull
any piping bends if at all possible
and only use 28mm piping. If there are
any horizontal sections of pipe, they
must be mounted using a 5° rise
towards the Domestic hot water
tank/Heat sink radiator, continually
along its length.
Injector Tee:
An injector tee is often used in the
piping system of stoves to connect the
two return pipes to the stove and
although an effective means of
producing the necessary flow in the
gravity circuit when the central
heating pump is operated the system
MUST be checked that it is operating
as designed before the commissioning
is signed off. A common problem with
the injector tee is that it stops flow
in the gravity circuit once the pump
is operated and the domestic hot water
tank goes cold
The correct size injector tee is
vital. The three ports should be of
the sizes listed here, Pump return
from heating, 22mm, Gravity return
from domestic hot water tank 28mm and
return to the stove 28mm. The injector
tee must also be placed as near to the
stove as possible.
Pipe Stats:
For the proper operation of the
heating system it is most important
that the pipe stats operate at the
correct temperature and are placed as
near to the stove as possible to
prevent low temperature condensation
within the stove and to operate at a
temperature that will prevent boiling.
Many systems are operated using just
one stat placed on the flow from the
stove. The main issue with using just
one stat is that the water coming back
to the stove can be very cold and this
leads to a lot of condensation in the
boiler but until that cold water flows
through the stove and often through a
considerable length of piping to get
to the stat the pump keeps operating.
The user will most often have no idea
of the condensation happening within
the stove. By using two pipe stats
there is a much better control of the
return water temperature that will
considerably reduce condensation in
the stove. The high limit stat will
only operate at a temperature of 80°C
and will only operate just long enough
to prevent boiling.
System controls:
The low limit pipe stat can be used to
integrate the stove into even the most
modern heating control systems. Time
clocks, Zone controls, thermostats
etc. can be wired to switch off the
low limit stat when required. By using
the low limit stat in this way
considerable savings can be secured by
limiting the stove output when the
various room stats or time clocks do
not call for heat. Even when the
controls switch off the central
heating pump, the domestic hot water
will remain heated and the high limit
stat will ensure that no boiling
occurs within the stove.
General note on room output:
If the plumbing system is quite small
in comparison to the boiler output, or
if the heating control system is wired
to control the low limit stat. it must
be noted that the rated output to the
room will be affected by the
restriction of the burn rate to
