Technical data

DBW 2010 / 2012 / 2020 / 2022 / 300 / 350 3.The Definition of the Function
301
3 The Definition of the Function
3.1 General
The heating devices with high pressure vaporizer burner
work intermittently. The regulation will be achieved by
- thermostatic sensor (heating device equipped
with the control device 1553), or
- temperature sensor (the sensoric heating devices
equipped with the control device 1563/1564)
3.2 Operation
Opening and shutting off of the heating devices will be
achieved by
- switch (on/off), or
- program timer (DBW 2012 and DBW 2022 / not
permitted for TRS)
A work indicator lamp in the program timer or a
separately installed indicator lamp is available for the
supervision of the work flow.
The heating devices can be equipped with the following
as desired:
- pre-heating of the nozzle block with heating
cartridge for excessively low temperatures
- an economy circuit for the reduction of the fuel
consumption (only with the control device 1563)
The work flow of the sensoric heating devices is partially
somewhat different (refer to Figure 302).
3.2.1 Opening
The control lamp goes on when the device is started. The
burner fan, fuel pump and circulation pump start
functioning. The magnetic valve will be opened
approximately after 15 seconds, the fuel will be sprayed
in the combustion chamber through the vaporizer nozzle
and will be ignited with the high voltage arc that will be
activated at the same time. The control device shuts off
the induction bobbin with a signal conveyed by the flame
regulator after the formation of the flame. If there is no
combustion, refer to 3.2.4.
3.2.2 The heating
The regulation thermostat takes over the regulation task
after the work temperature has been reached (the control
device in the sensoric heating devices).
The temperature of the heat carrier (the cooling liquid) will
be kept at a fixed level by alternately opening and
shutting off the heating device. The magnetic valve
interrupts the fuel supply if the temperature exceeds the
upper limit and the flame goes off as a result. The post-
function will be started, the burner fan continues to work
in the meanwhile and stops working automatically
approximately after 150 seconds (90 seconds in the
sensoric heating devices). The circulation pumps goes on
working with intervals and the control lamp is on. A new
work period begins in the heating device when the
temperature falls underneath the lower limit.
3.2.3 Shutting off
The combustion will be ended when the heating device is
shut off. The control lamp goes off and the post-function
will be started. The burner fan and the circulation pump
will be shut off approximately after 150 seconds (90
seconds in the sensoric devices).
The re-activation of the heating device during the post-
functioning period is possible.
3.2.4 Shutting off as a result of failure
For the heating devices equipped with the control
device 1553 and 1564/64
Shutting off as a result of failure occurs in the following
cases:
- If there is no combustion 30 seconds after the
heating device has been started
- If there is an interruption of fuel supply for more
than 10 seconds during the heating operation
- The heating device will be shut off by the thermal
fuse or temperature constrainer in case of
excessive heating of the heating device. A new
thermal fuse of the same value (pay attention to
the color code) should be installed or the
temperature constrainer should be set to zero by
pushing the button (after the temperature has
fallen under 60 0C) in such case.
For the heating devices equipped with the control
device 1553
- In case of low voltage for approximately 10 – 25
seconds after the temperature has fallen under
the lower limit
For the sensoric heating devices equipped with the
control device 1563/64
- In case of sensing foreign light or low voltage 12
seconds after staring
- The heating device will enter the failure blockage
after 90 seconds of post-functioning in case of
low voltage for 12 seconds during the combustion
The failure blockage will be cancelled after the heating
device has been shut off and opened following the
elimination of the reason of the failure.