Operating Sequence - Immergas EOLO 21 Maior Technical Documentation Manual

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Table of Contents

Technical documentation

EOLO 21 / 24 / 27 Maior

Heating phase

POWER SUPPLY

Main switch in WINTER position

(SUMMER if CAR is fitted)

POWERING MODULATION CARD

AND CAR (remote control)

Closing the contacts of the main switch powers the

modulation card, the remote control (if fitted) and

enables the central-heating function

CLOSING OF THE ROOM THERMO.

SWITCH / CAR FUNCTION REQUEST

Request of room thermostat or CAR (if fitted) detects

conditions requiring operation in central-heating phase

If the contact of the system water pressure switch is closed, the modulation board controls the

The unit checks the correct position of the flue pressure switch (normally closed NC contact)

The ignition cards checks deviation of the flue pressure switch contact following fan operation

With the consensus of the overheating thermostat, the unit powers the main gas valve (Y1)

When the gas valve has been powered, the board conveys soft ignition current to the

By means of the ionisation electrode, the unit detects burner ignition and terminates the

The burner operates at variable output according to the type of request, to the

adjustments/settings made and to the temperatures read by the NTC sensors

STEM@ ed 06/01