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63
AST 14 C 258/00
Solar function characteristics
When the solar pump activates, the boiler display shows the icon indicating that
the pump is active.
If there is a failure involving the solar tank heater probe (SBS), or the solar
collector probe (SCS), the solar pumps switches off immediately and the fault is indicated
on the boiler board interface and the remote control (if connected), via the associate error
codes (E28 and E24, respectively).
Select the parameters P91 and P92 to force the solar loads during maintenance work. In
this way, the additional board relays are energised until the parameter is reset at its former
value.
Characteristics of the additional board
Power supply
230V AC -15 to +10% 50Hz
Load output
230V AC, 1° max
Flow probe
NTC 10k Ohm @25°C B3435
Max. 3 metres
Solar probe
PT1000 Max. 100 metres
Correct flow probe operating range
-5°C to +120°C
Correct solar probe operating range
-40°C to +290°C
Mixing valve deactivation range due to set-point reached
Set+1.5°C / Set-2°C
Mixing valve full opening timer
From 0 to 300s (P74)
Initial closure timer with powered board
P74 + 40s
Request end closing timer
P74 + 20s
Post-circulation timer
From boiler, with P13
Circulation pump anti-shutdown timer
3s every 24 hours
Anti-freeze timer
15 min
Anti-freeze intervention temperature
< 5°C
TEMPERATURE PROBE CHECK
The system checks the fault status of the probes connected to the modulation board. A
fault occurs when the probe is not powered (except for the external probe), or when it
reads a temperature value outside the correct probe operating range:
External probe failure
(E23):
each request for operation on heating mode which
entails ignition of the burner is carried out without taking into account the calculation
algorithm: the curve value is used to determine the operating range (standard or
reduced) with the set-point corresponding to that entered.
Correct operating range:
from -40 to +50°C, general tolerance: +3°C
.
