H
Water main
K
BS stop valve
L
Pressure reducing valve (if neces-
sary)
M
Control unit
N
Room temperature control (on
site)
Connection of Viessmann
Vitotrol 100 see page 42
O
Time switch
P
Frost stat
R
Open therm-connection(alterna-
tive)
Connection see page 42
S
Connection box (not supplied)
T
Fuse 3 A
U
Mains ON/OFF switch
V
When connecting, remove bridge
W
Temporary filling loop
X
Water mains
fÖ
Power supply
gH
Mains connection accessories/
room temperature control/DHW
cylinder control
LR Connection of room temperature
control
LS Connection of DHW cylinder con-
trol
&
The following Viessmann control
configurations are available:
Constant temperature
Timer with constant temperature
Vitotrol 100 UTD
&
The boiler requires a permanent live
feed via plug 40.
System boiler
Cylinder connected directly to boiler.
Note
The boiler incorporates an internal bypass to ensure adequate water flow, how-
ever one radiator should be permanently open (fitted with two lockshield valves)
to dissipate any excess heat.
Installation Requirements
(cont.)
23
Preparing for installation
58
62
670
GB
Installation
