42
ENGLISH
TECHNICAL ASSISTANCE SERVICE
SHUTDOWN
If you are going away for a short period of time like a
weekend or a short holiday, etc., turn the function selector
to “
É
“ OFF/RESET.
The digital display reads out the message shown alongside.
Because electrical power and the gas supply to the boiler
both remain on, the boiler is protected by the following
systems:
- The boiler frost protection function that protects the
heat exchanger if outdoor temperature falls below -5 °C
during total shutdowns.
b
The message AF flashes on the display for as long
as the frost protection function remains active.
- - The CH circuit frost protection function that protects
the mixing column and the mixed CH circuits against
the risk of freezing. The mixed CH circuit temperature
sensors protect only the low temperature circuits: the
“BAG” card’s own sensor protects the high temperature
circuit. If the temperature detected by any one of the
sensors (mixed circuit or BAG) falls below 10°C, the
pump for the circuit concerned is switched on for a time
determined by the setting of the "FROST PROTECTION
TIME" parameter. If temperature rises above the 10°C
threshold during this time, the pump is switched off.
If temperature has not risen above 10°C by the end
of “FROST PROTECTION TIME”, but has not dropped
below the "FROST PROTECTION THRESHOLD", cir-
culation is re-activated for 4 minutes after 2 hours. If
on the other hand temperature falls below the "FROST
PROTECTION THRESHOLD" (irrespective of when or
how) a request for heat is generated and the boiler runs
at minimum power until the temperature detected by the
sensor (mixed circuit/BAG) rises above 10°C.
- The anti-seize function that opens and closes the mixer
valve (if fitted) and the circuit pump for 10 seconds, at
intervals determined by the setting of the "ANTI-SEIZE
INTERVAL" parameter. This function serves to prevent
seizure of the pump rotor.
If the boiler is not going to be used for an extended peri-
od of time, proceed as follows to prepare it for shutdown.
- Turn the function selector to OFF/RESET.
- Turn the mains power switch OFF.
- Close the fuel shut-off cock and the central heating and
DHW circuit shut-off cocks.
Note that the frost protection and pump anti-block func-
tions are not active under these conditions. Drain the
central heating circuit and domestic hot water circuit if
there is any risk of freezing.
ON
OFF
20
40 60 80
100
4
3 2 1
0
0
120
