Efficient Heating System Operation; Weather Compensation; Boiler Frost Protection; Boiler Restart - Zanussi ULTRA COMBI 30 User Manual

EFFICIENT HEATING SYSTEM OPERATION

The boiler is a high efficiency, condensing appliance which will
automatically adjust its output to match the demand for heat.
Therefore gas consumption is reduced as the heat demand is
reduced.
The boiler condenses water from the flue gases when
operating most efficiently. To operate your boiler efficiently
(using less gas) turn the central heating temperature knob
(C) to the ' ' position or lower. In winter periods it may be
necessary to turn the knob towards the 'max' position to meet
heating requirements. This will depend on the house and
radiators used.
Reducing the room thermostat setting by 1ºC can reduce gas
consumption by up to 10%.

WEATHER COMPENSATION

When the Weather Compensation option is fitted to the system
then the central heating temperature knob (C) becomes
a method of controlling room temperature. Turn the knob
clockwise to increase room temperature and anti-clockwise
to decrease room temperature. Once the desired setting has
been achieved, leave the knob in this position and the system
will automatically achieve the desired room temperature for all
outside weather conditions.

BOILER FROST PROTECTION

The boiler is fitted with frost protection that operates in all
modes, provided the power supply to the boiler is always
turned on. If the water in the boiler falls below 5ºC, the frost
protection will activate and run the boiler to avoid freezing.
The process does not guarantee that all other parts of the
system will be protected.
If a system frost thermostat has been installed, the boiler must
be set in winter mode, '
run.
If no system frost protection is provided and frost is likely
during a short absence from home it is recommended to leave
the system heating controls or built in programmer (if fitted)
switched on and run at a reduced temperature setting. For
longer periods, the entire system should be drained.

BOILER RESTART

To restart the boiler, when directed in the listed fault codes (see
section 8), turn the mode knob (D) to 'restart' position and
IMMEDIATELY turn knob back to required setting. The boiler
will repeat its ignition sequence. If the boiler still fails to start
consult a Gas Safe Registered Engineer or in IE a Registered
Gas Installer (RGII).

MAINS POWER OFF

To remove all power to the boiler the mains power switch must
be turned off.
4
', for the system frost protection to

3. SYSTEM WATER PRESSURE

The system pressure gauge (G - see page 3)
indicates the central heating system pressure.
If the pressure is seen to fall below the original
installation pressure of 1-2 bar over a period of
time and continue to fall then a water leak may
be indicated. In this event re-pressurise the
system as shown below. If unable to do so or if
the pressure continues to drop a Gas Safe Registered Engineer or
in IE a Registered Gas Installer (RGII) should be consulted.
THE BOILER WILL NOT OPERATE IF THE PRESSURE HAS
REDUCED TO LESS THAN 0.3 BAR UNDER THIS CONDITION.
To Top up the system :-
1. Ensure both & handles (blue) are in closed position (as
B
A
shown below)
2. Remove the plug and cap and retain.
3. Connect the filling loop to the Domestic Hot Water (DHW) inlet and
tighten. Also ensure that the other end of filling loop is hand tight.
Starting Position
Filling
Loop
Cap
Filling Loop
Handle (Blue)
Filling Position
Cap
Plug
Filling
Loop
B
4. Turn the Domestic Hot Water (DHW) Inlet
the horizontal position.
5. Ensuring no leaks are seen, gradually turn the filling loop
handle (blue) to the horizontal position.
B
6. Wait for the pressure gauge to reach 1 to 1.5 bar.
7. Once pressure is reached turn valves
closed position.
8. Disconnect the filling loop, replace cap and plug. Note there
can be some water spillage at this point.
Domestic Hot Water
(DHW) Inlet Valve
A
Plug
B
A
blue handle to
A
& B back to the
A
User's