Viessmann VITOSOLIC 200 Installation And Service Instructions Manual page 121

Bypass
(cont.)
Version 3 – bypass circuit with solar cell and collector tempera-
ture sensor
CS
R R1
S1
CS Solar cell
R1 Solar circuit pump
R Bypass pump (at R2, R6 or R7)
S1 Collector temperature sensor
■ The solar control unit records the solar
intensity via the solar cell.
■ Bypass pump on:
When the selected insolation thresh-
old "SC Byp." is exceeded.
■ Bypass pump off, solar circuit pump
on:
When the start temperature differential
"ΔTon" is exceeded between the col-
lector temperature and the cylinder
temperature.
■ Bypass pump also off:
The insolation falls for approx. 2 min
below the set threshold.
■ Reference sensor for this bypass cir-
cuit is the collector temperature sensor
S1.
Function description
Make the following settings at the
solar control unit:
1. Main menu
■ "Solar"
■ "Options"
– "Bypass"
Set "Yes".
– "SC bypass"
Set "Yes".
2. Main menu
■ "Contractor"
■ "Sensors"
– "Solarcell type"
Set value from page 76.
3. Main menu
■ "Solar"
■ "Setting values"
– "SC Byp."
Delivered condition 200 W/m
Set value (see page 153).
4. Main menu
■ "Solar"
■ "Contractor"
– "Sen. bypass"
Delivered condition 3
Set value "1".
– "Bypass"
Set "Pump".
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