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61
AST 14 C 258/00
The VM valve is powered in the heat discharge position, according to the following
logic:
Tscs > (P22-10°C)
and
Tsbc > 95°C
At this point (with VM on heat discharge), the PS solar pump is powered when:
Tscs > Tsvs
This function deactivates then PS switches off under the following conditions:
Tscs < (P22 -12°C)
or
Tscs > P22
Important. In the event of a failure involving the SBC boiler tank heater probe, this
function is not performed. The same applies if an operating mode other than
DHW+HEATING, HEATING ONLY or DHW ONLY is set on the boiler.
Tank heater cooling function
This function cools the tank heater to the set-point value by dissipating excessive
tank heater heat on the solar collector. This only occurs when the solar tank heater
exceeds the set-point temperature following activation of the heat dissipation
function.
If remote control is not connected, the tank heater cooling function is always active.
Otherwise, it is only enabled from 00.00am to 6.00am.
Activation of the PSOL solar pump for tank heater cooling:
Tsbc > P19 + 2°C
and
Tscs < Tsbs-
∆
T ON (P20)
This function deactivates when the PSOL switches off under the following
conditions:
Tsbc < P19
or
Tscs > Tsbs-
∆
T OFF (P21)
Important. This function is only active if the DHW+HEATING, HEATING ONLY or
DHW ONLY operating mode is set on the boiler. It is not active in the case of a
failure involving the SVS solar valve probe.
Set parameter P26 to 1 to activate this function.
Anti-freeze function on solar collector
This function must be enabled by setting parameter P24 to 1. In this way, when the
temperature read by the collector probe is below 4°C, the PSOL solar pump
activates until the temperature reaches 5°C.
