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4.5.3 Malfunctions during run-down
If the circulating pump is externally actuated, it will
continue operating.
Malfunction causes:
t
Short circuit and/or interruption of electrical components:
– Burner motor (stops immediately)
– Circulating pump.
t
Heater operation outside the permissible temperature
range.
t
Motor speed signal faulty.
t
Voltage falling short of the low voltage threshold of
approx. 20.5 V at motor start or within a duration of
20 seconds after a heating request.
t
Voltage exceeding the high voltage threshold of approx.
30 V at motor start or within a duration of 6 seconds
(run-down is applied, but no malfunction interlock).
t
Control unit malfunction.
4.5.4 Malfunction interlock release and error
clearance
The malfunction interlock is released when the heater is
switched off.
After that it will be immediately ready for operation.
The detected error is stored in the error memory and can
be read using SST diagnosis.
It is possible to delete the stored error using SST
diagnosis (see 4.3).
4.6
Heater interlock
The heater interlock overrides the standard
malfunction interlock.
If the heater interlock is active, neither start nor run-down
are executed after switching the heater back on.
Prior to restarting the heater troubleshooting must be
performed by personnel trained by Spheros in order to
identify the root cause.
After that the heater interlock can be released (see 4.6.1).
Here it is differentiated between interlocks caused by
overheating and interlocks caused by other errors.
If malfunctions occur during switching-on or during the
start process prior to ignition, the heater will be switched
off without run-down.
The heater is in heater interlock state.
The burner motor stops immediately or does not start.
Besides that a run-down between 30 seconds and 60 seconds
is performed depending on error type and timing.
Subsequently the heater status is switched to heater interlock.
If the circulating pump is externally actuated, it will
continue operating.
Heater interlock causes:
t
Short circuit and/or interruption of electrical
components:
– Solenoid valve
– Flame detector
– Overheating protection
– Water temperature sensor.
t
Flame not expired within 30 seconds after run-down
started. (Burner motor stops).
t
Overheating protection triggered.
t
Control unit error or programming error.
t
Repeated malfunctions.
t
Repeated flame interruptions.
4.6.1 Heater interlock release
The heater interlock timing must be observed!
Was the heater interlock triggered within 120 seconds
(e.g. in case of maintenance or repair activities) or after
more than 120 seconds.
The release procedure depends on the interlock timing.
The procedure is also different if the release
performed with or without SST diagnosis.
Temperature sensor, overheating protection errors or
errors causing overheating cause a heater interlock
in software and hardware.
Thus, the interlock must be released in software and
hardware.
For this purpose the heater must be disconnected
from the vehicle electrical system twice.
NOTE
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...
