Viessmann C3HA, Installation And Service Instructions For Contractors

Page: 34 / 192

34
Connections (without connection accessories)
D C A B E F G
A Heating flow G ¾
B Gas connection G ¾
C
Condensate drain
D Drain safety valve
E Heating return G ¾
F Plug for junction box, sensors and
accessories
G Power cable
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].
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 2 power cable.
Install power supply socket on site.
Preparing for installation
Preparing for installation
(cont.)
5618 294 GB