Viessmann VITODENS 100-W Installation And Service Instructions Manual page 23

Preparing for installation
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)
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.
(cont.)
T Fuse 3 A
U Mains ON/OFF switch
V When connecting, remove jumper
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
Preparing for installation
23