Viessmann VITODENS 111-W Installation And Service Instructions Manual page 9

Preparing for boiler installation
Safety assembly to DIN 1988 and EN 806 at the cold water connection
A
B
D E F GH D
C
O
Fig. 2
Safety assembly (accessories for connection sets
A
for unfinished walls)
Safety valve
B
Visible discharge pipe outlet point (tundish)
C
Shut-off valve
D
Flow regulating valve (installation recommended)
E
Pressure gauge connection
F
Non-return valve
G
Combination inlet group
Combines elements ,
A M
Pressure reducing valve
■
This must be installed near the cylinder. The cold
water supply to any mixer taps/showers must be
taken from the cold water tapping of this valve to
ensure balanced hot and cold pressures. This valve
is factory set to ensure the correct operating pres-
sure.
■ Non-return valve
This is integral to the pressure-reducing valve to pre-
vent the backflow of hot water towards cold water
draw-off points.
Cold water expansion relief valve
■
This safety device is preset at the factory and will
relieve excess cold water pressure resulting from a
fault condition.
(cont.)
D H L
K
and
N
M D N K
Drain
H
Cold water
K
Drinking water filter
L
Pressure reducer to DIN 1988-2, Dec. 1988 issue
M
Non-return valve/pipe separator
N
Cold water connection at connection set (accesso-
O
ries)
Preparing for installation
9