Viessmann VITOCROSSAL 200 CI2 Series Installation Instructions Manual page 17

Vitocrossal 200 CI2 Installation
Gas Connections
(continued)
The gas train on the burner meets the requirements
of ASME/CSD-1.
1. Connect gas pipe A to the gas valve.
Gas connection:
Vitocrossal 200, CI2: 1b in. NPT for models 399, 500,
750 and 1000, 2 in. NPT for models 1500 and 2000.
2. Test leak tightness of gas pipe connection using an
approved method.
3. Purge gas line in a safe manner using an approved purge
burner.
WARNING
If test pressure is too high burner and gas fittings
may get damaged.
WARNING
Escaped gas may lead to explosion, which could
cause severe injuries. Do not vent gas pipe above
combustion chamber of boiler.
CAUTION
If gas pipe contains dirt it is recommended to install
a gas filter into the gas pipe.
Vitocrossal fuel supply recommendations
- Always read and follow the instructions provided with
the gas pressure regulator.
- Install high pressure regulator a minimum of 10 ft. (3.3 m)
upstream of the boiler fuel connection.
- Install one gas pressure regulator per boiler.
- Use a gas pressure regualtor with an outlet size equal to
the boiler fuel connection, if a change in pipe diameter is
required a concentric reducing coupling should be used.
Installation
17