boiler protection devices
30
8 °C
3 °C
Anti-frost Device
The anti-frost function acts on the central heating ow temperature
probe, independently from other regulations, when the electrical
supply is turned on.
If the primary circuit temperature falls below 8°C the pump will run
for 2 minutes.
After the two minutes of circulation ( xed) the boiler will check the
following:
a) if the central heating ow temperature is > 8°C, the pump stops;
b) if the central heating ow
temperature is between 4
and 8°C, the pump will run for
another two minutes;
c) if the central heating ow
temperature is < 4°C, the
burner will re (heating
position) at minimum power
until the temperature reaches
33°C, the burner will go out
and the pump will continue to
run for two minutes.
Activation of the anti-frost safety
device is signalled on the display
by the symbol
.
The anti-frost device activates only when (with the boiler operating
correctly):
- the system pressure is correct;
- the boiler is electrically powered;
- there is a supply of gas.
External P.C.B.’s
411 Zone 1 - Room sensor circuit open / short circuit
412 Zone 2 - Room sensor circuit open / short circuit
413 Zone 3 - Room sensor circuit open / short circuit
Ignition and Detecion
501 No ame detected
502 Flame detected with gas valve closed
504 Flame lift
5P1 1st Ignition Failed
5P2 2nd Ignition Failed
5P3 Flame cut-o
Air Inlet / Flue gas outlet
610 Exchanger Probe Open Circuit
612 Fan Error
Multi-zone Heating
701 Zone 1 send sensor defective
702 Zone 2 send sensor defective
703 Zone 3 send sensor defective
711 Zone 1 return sensor defective
712 Zone 2 return sensor defective
713 Zone 3 return sensor defective
722 Zone 2 overheating
723 Zone 3 overheating
750 All Heating Zones locked
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