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user instructions TWIN80C_EN
2
General
The TWIN 80C is a wall hung, fan flue, room sealed, high
efficiency condensing gas boiler for central heating and / or under
floor heating systems.
The type plate, which specifies the type of gas etc. to be used, for
which the unit is set, is on the left side of the unit.
The appliance is equipped with pre-set gas/air ratio regulators.
The purpose of this regulator is to keep the gas/air ratio in the
burner as optimal as possible at all times e.g. when modulating.
This ensures clean and reliable combustion across the entire
load range. In addition it achieves high part-load efficiency.
How the boiler works
The TWIN 80C incorporates 2x heat units. Each heat burner
works independently, cascade controlled by two printed circuit
boards.
Master – Left hand side printed circuit board.
The Master is the leading board, calculates and divides the
necessary power over both units. Therefore the regulation
controls will always be connected to the Master.
Slave – right hand side printed circuit board.
In most cases of a lock-out of the Master printed circuit board
the Slave is still able to operate correctly.
A fan sucks the air required for the combustion through the air
feed canal (A). Because the combustion air in the venturi sucks
an under pressure, the correct amount of gas (G) is
automatically added to the combustion air.
The flammable gas/air mixture thus obtained is fed to the
burner(s), via a mixing chamber, to be ignited at the surface of
the burner(s) by a ceramic glow plug. The hot combustion gases
are efficiently fed through the heat exchanger(s), where they
give their heat to the system water. The flue gases are fed
outdoor, through the flue tube (F), into a combined flue tube
exhaust canal.
The formed condensation water (H
2
O) is discharged through the
waste trap.
Burner is on
when the room thermostat is closed (heat demand)
and when the actual flow temperature is 5°C below the set
point (desired heating flow temperature)
and after 3 minutes anti-reciprocital time, if applicable, after a
reciprocital stop
Burner is off
when the room thermostat is open (end of heat demand)
when the actual flow temperature is 3°C above the set point
(blocking)
or when the actual flow temperature is 3°C above the
maximum permissible central heating temperature.
LED indication
Two LED’s have been placed under the appliance informing the
user the status of each unit individually.
The left hand side LED (L) is indicating the actual status of the
Left hand side heating unit.
LED is ON = burner concerned is ON
LED is OFF = burner concerned is OFF
LED is FLASHING = unit concerned is LOCK-OUT
The right hand side LED (r) is indicating the actual status of the
right hand side heating unit.
LED is ON = burner concerned is ON
LED is OFF = burner concerned is OFF
LED is FLASHING = unit concerned is LOCK-OUT
2


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