Water Side Connections - Viessmann VD2-320 Installation Instructions Manual

Connections

Water Side Connections

Cast iron block, rear view
Legend
BR Boiler water supply connection
BS Drain
D Boiler water return connection
20
Vitorond 200, VD2 Series 320 to 1080 Installation
IMPORTANT
Ensure all requirements detailed in the Vitorond 200, VD2
System Design Guidelines and/or Technical Data Manual
are met.
The Vitorond 200, VD2 boiler is only for use in forced
circulation hot water heating systems.
1. Thoroughly rinse heating system (particularly when
retrofitting the Vitorond 200, VD2 to an existing
heating system).
2. Install supply and return headers (see following page).
Make all heating system connections.
Installation of a spring-loaded flow check valve, immediately
downstream of the circulation pump in the heating circuit
supply as a mechanical "break", is recommended to prevent
water from flowing unintentionally to (space) heating
circuits during DHW priority or summer operation (when
only DHW is produced).
WARNING
Do not install an isolation valve between boiler and
safety header. Discharge pipe must be oriented
to prevent scalding of attendants.
3. Install safety piping.
IMPORTANT
Removal of air from system water must occur via use
of air vent(s). To ensure the boiler can be purged of all air,
ensure supply/return water lines do not contain restrictive
piping where air could be trapped.