Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors page 34

Preparing for installation
Preparing for installation
Connections (without connection accessories)
A Heating flow G ¾
B Gas connection G ¾
C Condensate drain
D Drain safety valve
On-site preparation of the gas, water and
electrical connections:
Note
Observe the requirements of
DIN VDE 0100.
1. Prepare the water connections. Flush
the heating system.
Note
Fit the expansion vessel to the heat-
ing return.
2. Prepare gas connection to TRGI [or
local regulations].
34
(cont.)
C A F G B D E
E Heating return G ¾
F Plug for junction box, sensors and
accessories
G Power cable
3. Prepare electrical connections.
Information on the power supply
■ The power supply for the
Vitotwin 300-W must have sepa-
rate MCB/fuse protection.
Connect the power supply directly
from the distribution board as per
connection conditions of your
power supply utility and VDE 0100
[IEE or local wiring regulations], not
from a final consumer circuit. Never
connect the appliance via a plug-in
connection. Observe national reg-
ulations.
■ The appliance is supplied with a
FLEX-JB 3 x 2.5 mm
Install power supply socket on site.
2
power cable.