
Scheme 3.
- General scheme of closed central heating system with 2 or more accumulation
(buffer) tanks.
5.3. GENERAL CONNECTION SCHEMES
All general schemes hereafter will be shown with one accumulation (buffer) tank, but they
can be performed with two or more accumulation (buffer) tanks (buffer tanks).
Pay attention to electrical and sensors connections on general schemes!
bar
2
2
3
P1
6
4
5
B
A
2
D
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
Terminal Block
P1
P2
P3
B
A
D
Connected to the boiler
electronics
A
B
E
E
1 - Boiler "BioTec Plus"
2 - "CAS" accumulation (buffer) tank
3 - Return flow protection (3-way mixing valve with actuator
(protection valve) or 3-way thermic valve (
60°C
),
VTC 512, VTC 531, LTC 261, LTC 271)
4 - Safety airvent unit
5 - Expansion vessel for closed systems (min. 10% of the total
volume of installation)
6 - Thermal safety valve
P1 - Pump P1 (boiler pump)
A - Accumulation (buffer) tank sensor (upper)
B - Accumulation (buffer) tank sensor (lower)
C - Return flow temperature sensor
D - Outdoor temperature sensor
E - Flue gas sensor
*
*
*
*
*
*
Not included in delivery of boiler BioTec Plus (need additional order)
B
io
T
e
c P
lu
s
05:08
OFF
0
0.0%
0.0%
xx°C
x%
xx°C
xx°C
xx°C
xx°C
xx °C
25.0°C
20.0-0.0°C
20.0°C
-°C
xx°C
1
*
C
**
**
C
Can be used only if it’s on position „3” installed actuator
Each heating scheme with BioTec Plus has option of installing up to 4 pcs CM2K
modules (additional heating circuits management, DHW preparation and
recirculation).
i
General connection schemes
Technical instructions
BioTec Plus
32