38
B
D
E
A
C
Fig. 46
A
Connection for safety valve, safety equipment
block R 1
¼
B
Boiler flow up to 160 kW DN 50, >160 kW DN 65
C
Pressure gauge R
½
D
Drain R 1
¼
E
Boiler return up to 160 kW DN 50, >160 kW DN 65
Note
The Vitocrossal is only suitable for fully pumped hot
water heating systems.
Never install 4-way mixers, overflow valves or other
flow/return bypass devices.
Never connect a heating return to the safety return.
!
Please note
Connections subject to mechanical loads can
cause appliance damage.
Connect the pipework free of load and torque
stress.
1.
Thoroughly flush the heating system.
2.
Connect the heating circuits.
Safety equipment block installation instructions
1.
Install the safety lines.
Min. cross-sections:
Safety valve inlet connection
3 and 4 bar (0.3/0.4 MPa): Up to
160 kW
R 1
3 and 4 bar (0.3/0.4 MPa): From
200 kW
R 1
¼
6 bar (0.6 MPa)
R 1
Safety valve discharge pipe
3 and 4 bar (0.3/0.4 MPa): Up to 160
kW
R 1
¼
3 and 4 bar (0.3/0.4 MPa): From 200
kW
R 1
½
6 bar (0.6 MPa)
R 1
¼
!
Please note
Connections subject to mechanical loads
can cause appliance damage.
Connect the pipework free of load and tor-
que stress.
2.
Check the connections on the heating water side
for leaks.
Permiss. operating pres-
sure
6 bar (0.6 MPa)
Min. operating pressure
1 bar (0.1 MPa)
Test pressure
7.8 bar (0.78 MPa)
Low water indicator (water level limiter)
Tests have verified that the requirements to EN 12828
are met. This makes an additional low water indicator
unnecessary.
Technical guide for "Gas condensing boilers"
Safety valve
Equip the boilers with a safety valve. Only use safety
valves that are type-tested to TRD 721 and are desig-
nated in accordance with the system version.
Connections on the heating water side
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