Ecoflam 3142132 Operating Instructions Manual Download

Page: 12 / 48

www.ecoflam-burners.com

420010463703

GAS OPERATING MODE - GENERAL SAFETY FUNCTIONS

Scheme of functioning

LEGEND

107: pilot gas filter/governor
141: ball valve
142: filter
143: antivibration coupling
150: butterfly valve
151: gas train Siemens VGD
155: pilot gas train
176: oil pump
178: solenoid valve
184: output control valve
311: return oil pressure switch
313: min gas pressure switch
CV: check valve
RL: return line
VL: suction line
VLO: working oil valve

START-UP MODE

As soon as the furnace system is required
to supply heat, the burner control circuit
will close and the program flow started.
When the program has come to its end,
the burner will be turned on.
An automatic test is made for the tightness
of the gas valves prior to each burner start.
The air damper is in its closed position
when the burner is out of operation.
The electric actuator will open the closed
air damper to its full-load position so that
the burner will ventilate the furnace and
the exhaust hoods with the specified air
rate.
Shortly after the preventilation process has
been started the lack-of-air cut-out must
change over to operating position within a
certain time, i.e. the minimum air pressure
setting must be reached and maintained
until the burner is turned off. At the end of
the specified pre-ventilation time the air
damper will be moved into its partial-load
position in a linked control concept with the
gas damper.
The ignition transformer will be started.
At the end of the pre-ignition time the
ignition gas solenoid valves will be opened
to allow gas to flow into the pilot burner.
The ignition electrodes incorporated in the
pilot burner will ignite the ignition gas.
The UV cell gives flame signal to

control box so that the safety shut-off
valves will be opened.
The gas will be fed to the gas nozzles via
the gas damper while combustion air is
supplied by the fan.
Gas and air will be intensively mixed in the
mixing unit and ignited by the pilot flame
with a specified safety period (minimum
furnace heat generating rate).
After the safety period has run down the
pilot burner will be turned off.

Attention:

If there are shut-off dampers in the flue
gas tract they must be completely open.
Otherwise there will be a high danger of
low-speed detonation or explosion!

GAS OPERATING MODE

After the flame has developed the load
regulator will be enabled which brings the
burner into its operating position.
The load regulator will now control the
burner automatically between its partial-
load and full-load stages. Depending on
the heat demand, the electric actuator of
the compound control system will be fed
with the OPEN or CLOSE command via
the regulator and thus increase or
decrease the gas and air flow rates.

This compound control system will vary
the positions of the gas control valve and
air damper and thus regulate the gas flow
rate in a linked concept with the air flow
rate. The burner can either be controlled
by a 2-stage sliding or, if a respective
controller is provided, a stepless control
concept.
The stepless control will allow the burner
to be operated at any desired stage
between its partial-load and full-load
positions.
The burner will always be turned off out of
its partial-load position.
The air damper will be closed when the
burner is out of operation and will thus
prevent cold air flowing through the burner
chamber, heat exchanger and chimney.
The interior cooling losses will thus be
greatly minimized.