Scheme 4.
- General scheme of closed central heating system with 1 accumulation (buffer) tank,
boiler return flow protection with 3 - way mixing valve with electric actuator.
NOTE:
- According to this scheme is possible to preform version for open central heating system
(see point 6.0, Connection to the central heating system).
- Return flow protection (3) can be also performed by 3-way thermic valve ((60°C), VTC 512,
VTC 531, LTC 261, LTC 271).
D
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
Terminal Block
P1
P2
P3
D
bar
4
6
5
2
3
P1
A
B
C
B
A
E
E
C
*
Not included in delivery of boiler BioTec Plus (need additional order)
1 - Boiler "BioTec Plus".
2 - "CAS" accumulation (buffer) tank
3 - Return flow protection (3-way mixing valve with actuator
(protection valve)
4 - Expansion vessel for closed systems (min. 10% of the total
volume of installation)
5 - Safety airvent unit
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 temperature sensor
*
Connected to the boiler
electronics
Mixing valve
actuator
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
General connection schemes
Technical instructions
BioTec Plus
33