Gas Connections; Gas Valve Flange Installation - Viessmann Vitocrossal 200 CM2 Series Installation Instructions Manual

Boiler

Gas Connections

Legend
A Gas pipe
B O-ring groove
C O-ring
D Gas valve flange
E Mounting screws
F Pressure measurement port
24
Vitocrossal 200 CM2 Installation Instructions
The gas train on the burner meets the requirement
of ASME/CSD-1.
1. Cut out the aperture in front side panel either left
or right.
Note: For ease during burner maintenance, route the gas
supply pipe from the opposite side of the burner
hinges (otherwise the panel cannot be removed
when swinging burner left or right). See page 26.
2. Connect gas pipe A to the gas valve.
Gas connection:
Boiler model 186:
Boiler models 246 / 311: 1¼ in. NPT
3. The inlet gas connection flange kit is included with
the burner (field mounted). The flange kit provides
an inlet connection for the gas valve. The flange kit
consists of:
- Gas valve flange D with measurement port F
- O-ring C
- Screws E (x4)
4. Test leak tightness of gas pipe connection.
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.
5. Purge gas line in a safe manner using an approved purge
burner.
CAUTION
If gas pipe contains dirt it is recommended to install
a gas filter into the gas pipe.

Gas valve flange installation

1. Make sure the O-ring surfaces B are clean.
2. Apply a moderate amount of good quality pipe dope,
resistant to the action of liquid propane gas (LPG) on
the gas threads.
3. Screw the flange into the pipe.
4. Using general purpose lithium grease, grease the
O-ring C provided with the flange kit and install
at the inlet of the valve.
5. Tighten the screws to secure the flange D to the
valve body. Torque screws E to 30 in/lb (3.5 Nm).
1 in. NPT