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3. Boiler Shutdown Situations
Shutdown Due To Insufficient Circulation
f the boiler is off , one possible cause for this state is an insuffi-
I
cient pressure of water in the system.
Check the system pressure on the pressure
gauge "D" and if it is less than 0.5 bar , re-
pressurise the system as instr ucted by your
installer, should y ou be unsure some basic
instructions are provided hereafter;
Ensure that the filling loop hose is connected to the cold w ater
inlet pipe and to either the Centr al Heating flow or return
Open the handle/s or tap/s to allow water into the Central Heating
system
Once the needle on the pressure gauge reaches 1 Bar, close the
handle/s or tap/s and disconnect the filling loop hose
Should it still be unclear ho w to proceed, please consult y our
installer.
If the boiler does not start up again, contact a local Service Agent.
If there are frequent drops in pressure within the system, ha ve a
plumber check the heating system for possible water leaks.
Anti-frost Device
The boiler is fitted with a de vice which, in the event that the water
temperature falls below 8°C the pump activ ates and r uns until a
temperature of 18°C is attained. In the event that the water tem-
perature falls below 3°C, the diverter valve switches to Domestic
Hot Water and the burner fires and runs on minimum power until
a temperature of 33°C is attained.
This device is only activated when the boiler is operating perfectly and
- the system pressure is sufficient;
- the boiler is powered electrically;
- gas is being distr ibuted.
4. Time clock
D
Note: the time clock is for central heating control only.
The time clock is provided with 96 switches, called riders, each of
which covers a time interval of 15 minutes (four per hour).
When a rider is switched from the inside (off setting) to the out-
side of the clock border (on setting), the circuit is closed (s witch
on) for a per iod of 15 min utes and then the boiler star ts if the
room thermostat (if installed) or the heating ther mostat require
heat (heating function on).
EXAMPLE
To set the heating of y our home in the time inter val from 7.00
am to 9.30 am and from 7.00 pm to 10.00 pm e very day:
- rotate the outer r ing of the cloc k in a cloc kwise direction until
the correct time of da y (24h) lines up with the arro w on the
clock (at approx. 2 o'clock position);
- under no cir cumstances should the min ute hand be
moved manually;
- make sure all the s witches, i.e. the riders, are placed on the
inside of the clock border;
- pull outward the riders for 7.00 am and 9.30 am, and then all
riders between these two;
- repeat this for 7.00 pm and 10.00 pm.
Other heating intervals may be set in the same w ay.
The timer has appro ximately 150 hours of batter y back up for
power failure.
The clock is provided with a selector s witch with three positions
(see figure):
1. Position "I" CONSTANT: in this position, the
clock circuit is always closed (switch on), there-
fore the boiler will constantly be on and will only
shut off upon the request of the room ther mo-
stat (if installed) or the heating ther mostat;
2. Position "O" HEATING OFF: in this position, the
clock circuit is alw ays open (switch off) and the
boiler will therefore never ignite for heating;
3. "Central" Position PROGRAMMING ACTIVE:
in this position, the programming set by the user
is active.
5
UT011Ap
UT014A
UT014A
UT014A
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