Making The Safety Connection And Testing For Tightness - Viessmann Vitoplex 200 SX2A Installation Instructions For Contractors

Connections on the heating water side
B A C E
D
Fig. 9 350 to 560 kW
Boiler return
A
For 350 kW:
For 440 and 560 kW: DN 100
Female connection for Therm-Control temperature
B
sensor (NTC 10 k ), R
Ω
Female connection for fitting assembly, R
C
Safety connection (safety valve)
D
Female connection for high limit safety cut-out
E
(instead of flash trap), R

Making the safety connection and testing for tightness

Safety equipment block installation instructions
Install the safety lines.
Safety connection
90 to 350 kW
■
440 and 560 kW
■
Permiss. operating pres-
sure:
Test pressure:
Low water indicator
The boiler control unit included as standard prevents
impermissible heating in the case of water shortage.
According to EN 12828, a low water indicator can
therefore be omitted for Vitoplex 300 boilers up to 300
kW (except in attic heating centres).
G
F
H H
DN 80
½
½
½
4 bar (0.4 MPa)
5.2 bar (0.52 MPa)
(cont.)
Boiler flow
F
For 350 kW:
For 440 and 560 kW: DN 100
Female connection for boiler water temperature
G
sensor, high limit safety cut-out and temperature
controller
Drain, R 1
H ¼
Therm-Control start-up control (with temperature
sensor NTC 10 k
A shunt pump for raising the return temperature is not
required.
During the start-up phase, ensure that the heating cir-
cuit flow rate is reduced to no more than 50 % by
means of the heating circuit control unit or heating cir-
R 1
¼
cuit pumps. This applies during commissioning as well
R 1
½
as after night or weekend shutdowns. For multi boiler
systems, reduce to no more than 50 % of the smallest
boiler.
The heating circuit control unit or the heating circuit
pumps are regulated by means of the factory-fitted
Therm-Control temperature sensor (NTC 10 k
further details regarding the Therm-Control start-up
system, see the technical guide.
For installation, see separate installation instructions.
Note
Equip the boilers with a safety valve that is type-tested
according to EN 4126. The valve must be marked in
accordance with the system version.
Install all pipe connections free of load and torque
stress.
DN 80
)
Ω
). For
Ω
11