EN • 5
ENGLISHFRANCAISNEDERLANDSESPAÑOLITALIANODEUTSCH
664Y3500
USER DATA
All user controls are situated on the front panel of the boiler,
there are no user controls inside the boiler casing.
The following instructions assume that the boiler has been
commissioned, and that the system is filled with water and has
been fully vented.
SETTING UP
• Before switching on any electrical supplies to the boiler ensure
that the combined temperature and pressure gauge reads at
least 1 bar and the control thermostat is set to the desired
temperature.
• If any other auxiliary controls are fitted e.g. programmer, room
thermostats, cylinder thermostats etc, consult appropriate
manufacturers’ instructions to switch these on.
• Switch the winter/summer switch to winter position.
• Switch on any local means of isolation to boiler.
Ensure all the jacket panels are secured before
switching on electrical supply from the external
isolator.
• Switch the boiler on using the ON/OFF switch (a test of the
lights is done).
• After a short period of time the boiler temperature should
start to rise, indicated on combined temperature and pressure
gauge. The modulation level is displayed on the front panel
by the stage indicator lights. If the boiler fails to operate, the
overheat safety thermostat should be checked.
Access to the thermostat reset button is obtained by unscrewing
(anti-clockwise) the domed button cover on the front panel
(a screwdriver is not required).The reset button can then
be seen - press the button, a click should be heard and the
button is reset. If no click was heard the device is not at fault
and further investigation is required by a suitably qualified
engineer.
• The external programmer can now be set to allow on/off
periods as desired. The ON/OFF switch should be left in the
ON position during normal use.
The power level indicator will automatically light on and
off during normal boiler operation, depending on boiler
temperature.
• If the boiler is not in regular daily use during cold periods, it is
recommended that it is fitted with a frost sensing thermostat
to prevent the system from freezing.
• As with most boilers and heating appliances the casing and
pipework can get hot during normal running so the boiler must
not be covered and the surrounding area must be kept clear.
HEATING SYSTEM PRESSURE
The CH pressure must be a minimum of 1 bar and must be
checked by the end user on a regular basis. If the pressure drops
under 0.5 bar, the integrated water pressure switch blocks the
appliance until the pressure in the system returns to a level
above 0.8 bar.
The installer must fit an external filling loop to the system.
For more information, please ask your installer when the system
is delivered.
A pressure safety valve is provided with the appliance. If the
system pressure exceeds 4 bars, this valve opens and drains
the water from the system. In this case, please contact your
installer.
INSTRUCTIONS
CONTROL PANEL LEGEND
1. Control thermostat :
1 = 25°C
2 = 40°C
3 = 55°C
4 = 70°C
5 = 85°C
2. ON/OFF switch
3. Summer/Winter switch
4. Manual reset high limit thermostat
5. Overheating warning light
6. Minimum water pressure warning light
7. Combined temperature and pressure gauge
8. Power level indicators
9. Optional internal controller
1 2 3 9
4 5 6 7 8
