7729106 (02-05/19) 34
INSTALLER Section (en)
15. ADJUSTMENT AND SAFETY DEVICES
The boiler has been designed in full compliance with European reference standards and in particular is equipped with the following:
• Limit thermostat
Thanks to a sensor placed on the CH ow line, this thermostat interrupts the ow of gas to the burner if the water in the primary
circuit overheats. In these conditions, the boiler is blocked and only after the fault has been eliminated can it be ignited again by
pressing
for at least 2 seconds.
It is forbidden to disable this safety device.
• Fumes thermostat
This device, the sensor of which is positioned to the left of the fumes hood, interrupts the ow of gas to the main burner if the ue
is obstructed and/or there is no draught. In these conditions the boiler shuts down and displays error code E03. After eliminating
the problem, it is possible to reignite by holding down the
, button for at least 2 seconds.
It is forbidden to disable this safety device.
• Flame ionisation detector
The ame sensing electrode, located in the centre of the burner, guarantees safety of operation in case of gas failure or incomplete
ignition of the burner.
In these conditions, the boiler is blocked after 3 ignition attempts.
Press
for at least 2 seconds to re-establish normal operating conditions.
• Hydraulic pressure switch
This device allows the main burner to be ignited only if system pressure is higher than 0.5 bar.
• Heating circuit pump post-circulation
The electronically-controlled pump post-circulation function lasts 3 minutes and is enabled, in the heating mode, if the ambient
thermostat causes the burner to go out.
• Anti-freeze device
The electronic boiler management system includes a "frost protection" function for the heating and DHW systems which, when
ow temperature falls below 5°C, operates the burner until a ow temperature of 30°C is reached. This function is enabled when
the boiler is switched on, the gas supply is open and the system is correctly pressurised.
• Water not circulating in primary circuit (pump probably blocked)
If there is insucient or no water circulating in the primary circuit, the boiler blocks and the error code E25 is shown on the display.
.
• Pump anti-block function
If no heat demand is received in the heating and/or DHW modes for 24 consecutive hours, the pump will automatically start and
operate for 10 seconds.
This function is operative when the boiler is powered.
• Hydraulic safety valve (heating circuit)
This device is set to 3 bar and is used for the heating circuit.
Connect the safety valve to a drain trap. Do not use it to drain the heating circuit.
16. PUMP CAPACITY/ HEAD
This is a high static head pump t for installation on any type of single or double-pipe heating systems. The automatic air valve
incorporated in the pump allows quick venting of the heating system.
KEY TO PUMP CHARTS - “SECTION” E
Q RATE OF FLOW
H HEAD
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