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For these functions to work (antifreeze,
pump kick, automatic winter/summer
switching, anti-legionella etc.), the on/off
switch must not be operated (needs to
be kept permanently in the “on” posi-
tion).
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Antifreeze protection for the boiler: when boiler tem-
perature is below 5 °C the burner and the heating
circuit pump are switched on. When the temperature
increases and exceeds 15 °C the burner is discon-
nected and the pump continues to circulate for
10 mins.
Antifreeze protection for the installation: the heating
pump starts operating automatically either intermit-
tently or continuously depending on whether the ex-
ternal temperature is under 1.5 °C or under - 10 °C.
Antifreeze protection for the house: when the boiler
is equipped with a QAA70. Protection is provided by
maintaining ambient temperature at a minimum of
5 °C.
Antifreeze protection for domestic hot water: when
hot water production has shut down, a minimum
temperature of 4 °C is guaranteed by the regulator.
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To provide a degree of protection against the deve-
lopment of pathogenic bacteria in the hot water tank
during prolonged shut-downs, the domestic hot wa-
ter needs to be heated once a week to above 60 °C.
The anti-legionella function is used for this purpose.
It heats the hot water storage tank once a week to
an “anti-legionella” temperature of 65 °C.
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When heating ends, the circulating pump remains
on for a further 10 minutes.
In hot water storage systems, when water heating
ends, the circulating pump remains on until the boi-
ler temperature drops below 70 °C. During this
pump run-on period, the by-pass valve remains in
the “domestic hot water feed” position.
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If during shut-downs either the heating circuit has
not operated or the bypass valve has not been swit-
ched for more than about 24 hours, these are acti-
vated for a period of about 5 seconds.
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The regulator incorporates a temperature control
function; this can switch off the burner when the
temperature of the water in the boiler reaches the
maximum of 85 °C. The circulating pump remains
on until the real temperature of the water in the boi-
ler drops below 79 °C. The burner is then allowed to
start up again.
A boiler overheat protection also exists.
When the safety thermostat activates, the heating
circuit circulating pump and the fan motor are swit-
ched on for 10 minutes. The bypass valve switches
to the “heating” position.
This second safety system requires a manual reset
and generates an alarm on the boiler. The reset but-
ton has to be pressed to return to normal operation.
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The minimum time that the burner can operate is set
to 60 seconds.
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When using liquefied gas, the system can be adap-
ted at output ST9 to use an external solenoid safety
valve.
Index 5 signalling output is programmed as follows:
Output ST9 is on from phase 30 (fan speed rise ti-
me) to phase 50 (regulator ends heat demand)
Supply: AC - 230 V + 10 % / - 15%
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The sweep function is activated by pressing
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for at
least one second, i.e. when a demand for heating is
made so that the system comes on. The regulator’s
internal “on-off” functions remain inactive in this si-
tuation. The heating then operates at maximum
heat output until the temperature controller res-
ponds (to take the sweep function flue gas measu-
rements).
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