Injector Tee; Water Circuit Temperature - Stanley Tara Installation And Operating Instructions Manual

There must be no gate vales on this circuit and it
must have an expansion pipe exhausting to atmos-
phere. Cylinder and pipe work should be lagged to
minimise heat loss, fig. 11 illustrates the basic prin-
cipal of water heating system and must no be
regarded as a working drawing.
Fig.11

INJECTOR TEE

Where the gravity and central heating circuits join
together to return to the stove we recommend the
use of an injector tee connection, situated as close
to the unit as possible. This type of tee encourages
a stable flow of water through both circuits and
helps to prevent priority being given to the stronger
flow, which is most commonly the pumped central
heating circuit.
This way, there will be no shortage of hot water to
the taps when the heating is on. Where the appli-
ance is to be interlinked with another boiler it will be
necessary to use a double feed indirect cylinder in
accordance with BS1366 (See Fig. 13 for an illus-
tration).

WATER CIRCUIT TEMPERATURE

The return water temperature should be maintained
at not less than 40°C so as to avoid condensation on
the boiler and return piping. Fitting a pipe thermo-
stat to the flow pipe of the gravity circuit and wiring it
into the pump control will ensure rapid circulation of
the hot water.
In some circumstances it may be possible to over-
heat the appliance and the water inside will boil.
This will be evident by the sound of a knocking noise
coming from the appliance and pipes around the
house. If this occurs close off all air controls and
manually start the central heating pump if fitted.
One radiator on the heating circuit should be uncon-
trolled to act as a heat leak in the event that the
appliance overheats and has nowhere to discharge
a build up of hot water should the heating circuit be
satisfied. Be aware that steam and boiling water willl
be expended from any open vent from the heating
system probably in the roof space at the expansion
tank.
In the unlikely event that the appliance is not oper-
ating in freezing conditions the water must be
drained from the boiler to prevent frost damage.
14