16
PROVISION FOR FILLING SEALED SYSTEM
Fig.26
WATER CIRCUIT TEMPERATURE
The return water temperature must be maintained at
not less than 50°C so as to avoid condensation on
the boiler and return piping. Fitting of a by-pass
loop, and a pipe thermostat to the flow pipe and
wiring it into the pump control will ensure rapid
circulation of the hot water to avoid premature
burner shut down being activated by the cooker
thermostat when the central heating circuit is in use.
PIPE THERMOSTAT
The fitting of a pipe thermostat to the common flow
pipe within 150mm (6”) of the cooker is required in
order to activate the water circulation pump when
water in the boiler reaches 60°C. This will ensure
that return temperatures are maintained and the
pump to “run on” to transfer any residual heat to
prevent possible overheating. (see figs. 19 & 20)
When the flow temperature falls below 60°C the pipe
thermostat will de-activate the circulating pump and
allow the cooker to operate. (see fig. 20, 27 &
Wiring Diagram)
If a second optional pipe thermostat is used see (S
Plan fig.19 - 20) then it should be fitted within
200mm 8” of the cooker common flow. It must be
set at 85
o
C and wired to make temperatures rise to
activate the central heating motorised valve should
this temperature be achieved, this will ensure that
any excessive heat is transferred from the boiler.
Fig.27
C A R E F O R Y O U R CENTRAL
HEAT I N G
SYSTEM
We strongly recommend the use of suitable
corrosion inhibitors and anti-freeze solution in your
heating system, in an effort to minimise black oxide,
sludge and scale build-up, which effects efficiency.
In hard water areas the use of a suitable limescale
preventer / remover is advised.
Use only quantities specified by the water treatment
product manufacturer. Only add to the heating
system after flushing and finally refilling. Refer to
BS 7953.
NOTE:
Both thermostats must be connected to
make on temperature rise.
