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103

910.001.1 - EN

ISTRUCTIONS PERTAINING TO THE INSTALLER

The boiler has been designed in full compliance with European reference standards and in particular is equipped

with the following:

• Overheat safety thermostat

Thanks to a sensor placed on the heating ow, this thermostat interrupts the gas ow to the main burner in

casethewatercontainedinthecircuithasoverheated.Undertheseconditionstheboilerlocksoutandyou

can only repeat the ignition procedure by pressing the reset button on the boiler after you have remedied

the cause of the trip.

It is strictly forbidden to disable this safety device.

• Boilercircuitcirculationtest

The boiler electronic management unit is tted with a “boiler circulation test” function which involves con-

tinuously checking the primary circuit delivery and return temperatures. In case of an irregular increase in

the delivery and return temperature or a temperature reversal, the boiler stops and signals the error on the

display (see error table).

• Fluethermostat

This device, positioned on the ue inside the boiler, interrupts the ow of gas to the burner if the temperature

exceeds 90 °C. After verifying the cause of the trip, press the reset button positioned on the thermostat

itself, then press the release button on the boiler.

It is forbidden to disenable this safety device

• Flameionizationdetector

The ame sensing electrode guarantees safety of operation in case of gas failure or incomplete interlighting

of the main burner.

 Undersuchconditionstheboilerislockedout.

You must press the reset button on the boiler to restore the normal operating conditions.

• Pumpoverrun

The electronic control system keeps the pump operating for 3 minutes in central heating mode after the

room temperature thermostat has switched off the main burner.

• Frostprotectiondevice

Boilers electronic management includes a “frost protection” function in the central heating system which

operates the burner to reach a heating ow temperature of 30°C when the system heating ow temperature

drops below 5 °C.

This function is enabled as long as the boiler is connected to the a.c. power and gas supplies and the

pressure in the system is as specied.

• Pump-blockingprevention

In case there is no call for heat either from the central heating system or from the DHW system for 24 hours

on end the pump will automatically switch on for 10 seconds.

• Hydraulicpressuresensor

This device enables the main burner only to be switched on if the system pressure is over 0.5 bar.

15. CONTROL AND OPERATION DEVICES

Baxi Power HT Series User Manual

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