11
1.2
Preliminary checks
a
WARNING
– Should it be necessary to access the areas in the
bottom part of the appliance, make sure that the
system components and pipes are not hot (risk of
burning).
– Before replenishing the heating system, put on pro-
tective gloves.
Prior to use the
Murelle Pro HE MkII
boiler must be installed
and commissioned by a Gas Safe Registered engineer. It may be
necessary for the user to occasionally have to start the boiler,
for instance after a holiday or after an interruption of the gas
supply. In these cases the following operations must be carried
out.
– check that the gas isolation and water system valves are open
– using the pressure gauge (1) check that the pressure in the
heating system, when cold, is
1-1.2 bar
. If the pressure is less
than this, use the external filling device to repressurise the
system to
1-1.2 bar
– ensure that the filling device is turned off after use.
1
Fig. 2
1.3
Ignition
After having carried out the preliminary checks, proceed as fol-
lows:
– set the main system switch to "ON"
– on the display, check that the operating mode on the display
is "SUMMER”
l
and if necessary select it by pressing and
holding the button
s
for at least 1 second. The internal tem-
perature of the boiler will appear on the display
– open one or more than one hot water tap. The
r
should ap-
pear on the display and the boiler will ignite and stay alight
until the tap is turned off.
Once the boiler has been operated in "SUMMER mode"
l
"WINTER mode"
n
can be selected by pressing and holding
the button
s
for at least 1 second. The internal temperature of
the boiler will appear on the display. Ensure that any timers and
room thermostats are in the on position. The
t
will appear on
the display and the boiler will ignite.
1.4
Adjusting the delivery temperature
The temperature of the heating water can be adjusted by turn-
ing the
t
knob on the control panel.
Fig. 3
1.5
Adjusting the domestic hot water temper-
ature
The temperature of the domestic hot water can be adjusted by
turning the
r
knob on the control panel.
Fig. 4