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70
AST 14 C 257/00
¾
Solar probe failure
(E24, E27, E28)
:
With P18=0, if the solar tank heater probe (SBS) fails, the VM diverting valve moves
to the solar-only position (no integration by the boiler).
With P18=1, if the failure involves the solar tank heater probe (SBS) or the solar
collector probe (SCS), the PS solar pump switches off.
With complex solar panel systems controlled by the 0SCHEZONE01 additional
board, the failure on the solar valve probe (SVS) causes the diverting valve to shift
to the solar-only position, and the heat dissipation and tank heater cooling function
is inhibited.
When there is a request for operation on heating, flow anti-freeze or chimney-
sweep mode, with or without a request for DHW, the request is normally handled.
The system resumes normal operation when the fault is eliminated.
Resistance values (Ÿ) of the PT1000 solar probes at the various temperatures.
Prob e calib ration:
1k Ohm for 0°C
Tem perature
°C
Resistance
Ÿ
Tem perature
°C
Resistance
Ÿ
-20
922
60
1232
-10
961
70
1270
0
1000
80
1309
10
1039
90
1347
20
1078
100
1385
30
1118
110
1422
40
1155
120
1460
50
1194
130
1499
Correct operating range:
from -40°C to +290°C, general tolerance: +3°C
.
¾
Flue gas probe failure
(E07)
: the burner switches off immediately and the fan runs
at the ignition output for 6 minutes.
The pump performs the post-circulation cycle with the diverting valve on heating, if
there was a request for heating, flow-return anti-freeze or chimney-sweep before
the fault occurred, or if there was no request on the boiler. The pump runs with the
diverting valve on DHW only if there was a request for DHW or DHW anti-freeze
before the fault.
Refer to the table on the previous page for details on the resistance values (Ÿ) of
the flue gas NTC probe at the various temperatures.
Correct operating range:
from -20 to +180°C, general tolerance: +3°C.
Important. If the boiler or remote control is OFF, any fault is merely signalled; all the other
boiler operating elements (gas valve, fan, pumps, three-way valve and multifunction valve)
remain in the home position.
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