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401
4
Heater functions
4.1
General heater functionality
description
The heater principle is based on a high-pressure atomizer
burner and is monitored by an integrated control unit.
The burner motor powers the fan and the fuel pump. The
fuel pump is coupled to the motor using a plastic coupling.
The fan produces the required combustion air, the combustion
air volume is impacted by the burner motor speed.
The speed is monitored by a sensor in the control unit, which
analyses the changing magnetic field of the magnets in the
couplings.
The speed required for the CO2 -content is determined during
first calibration at Spheros and is stored in the control unit.
In a maintenance event the workshop can adjust the CO2-
setting using the STT diagnosis (Spheros-Thermo-Test-
Diagnosis) (see 4.2).
The fuel pressure is generated in the fuel pump and reduced
to the required pressure using a pressure limiting valve.
A solenoid valve releases the fuel via the atomizer nozzle
for combustion in the combustion chamber.
As an option, the fuel pump can be equipped with a nozzle
block preheater. The nozzle block preheater heats the
nozzle holder with the atomizer nozzle at low temperatures,
and thus the fuel. The fuel air mixture is ignited in the
combustion chamber via a high-voltage ignition spark.
The flame is monitored by a flame detector integrated into
the control unit.
Depending on the equipment, the heater is switched on
and off using a
t
digital timer
t
switch
t
or climate control.
During heating operation the burner is automatically
switched on and off. The heater is switched on, when the
temperature falls short of a lower temperature threshold,
and is switched off, if the upper temperature threshold is
reached (see table 401).
The switching thresholds depend on the heater variant
and the heating operation type. They cannot be changed
and are programmed into the control unit.
For overheating protection of the heater the switching
thresholds are modified by the control unit, if specified
temperature gradients are exceeded.
If the specified minimum burning duration is not reached,
the switching thresholds will be reduced. This protects the
heater against sooting of the heat exchanger.
An operating display is available for monitoring the operating
status. A flame indication can be optionally installed.
The operating display is also used to output error
messages in flash code.
It is also possible to read the flash code via the two-pin
plug in the heater wiring harness (see 4.7 and 5.3).
Use max. 2W lamps.
Table 401 Standard switching thresholds
Standard
Lower switching threshold: auxiliary heating in °F (°C) 172 (78)
Switching thresholds may deviate
per customer.
Upper switching threshold: auxiliary heating in °F (°C) 185 (85)
Lower switching threshold: normal mode parking heating in °F (°C) 158 (70)
Upper switching threshold: normal mode parking heating in °F (°C) 185 (85)
Lower switching threshold: saving mode 1 parking 131 (55)
heating in °F (°C)
Upper switching threshold: saving mode 1 parking 158 (70)
heating in °F (°C)
Lower switching threshold: saving mode 2 parking 113 (45)
heating in °F (°C)
Upper switching threshold: saving mode 2 parking 140 (60)
heating in °F (°C)
NOTE
Содержание Thermo S 160
Страница 2: ......
Страница 6: ...1 Introduction Thermo S 160 230 300 350 400 4...
Страница 11: ...S o m r e h T n o i t c u d o r t n I 1 160 230 300 350 400 105...
Страница 49: ...5 Troubleshooting and error correction Thermo S 160 230 300 350 400 520...
Страница 55: ...r e h T s m a r g a i d c i t a m e h c S 6 mo S 160 230 300 350 400 606...
Страница 71: ...9 Modifications and retrofits Thermo S 160 230 300 350 400 902...
Страница 73: ...10 Packing storage shipping Thermo S 160 230 300 350 400 1002 Empty page for notes...
Страница 74: ...x i d n e p p A A 0 0 4 0 5 3 0 0 3 0 3 2 0 6 1 S o m r e h T A 1 Appendix A Periodic maintenance...
