Viessmann VITODENS 100-W Installation And Service Instructions Manual page 21

Preparing for installation
Central Heating System (typical system designs)
The Vitodens 100-W is designed for connection to sealed central heating
water systems.
A sealed system must only be filled by a competent person.
Filling the heating system see page 48.
Combination boiler
Note
The boiler incorporates an internal bypass to ensure adequate water flow. Cer-
tain thermostatic radiator valve manufacturers may require that a bypass valve
is fitted in addition to the integral by pass. Specifications as to the individual
requirements should be sought prior to installation.
(cont.)
Preparing for installation
21