Viessmann VITODENS 200-W Installation And Service Instructions Manual page 110

Troubleshooting
Repairs
(cont.)
04. Remove the 4 screws from the fitting assembly.
05. Raise the boiler so that it is separated from the
connections. Remove the boiler from the wall.
06. Before fitting the boiler:
Insert new O-rings.
Lubricate the O-rings with the valve grease sup-
plied.
07. Insert new flat gasket for the gas shut-off valve.
08. Danger
Take care not to injure your hands.
Do not take hold of the boiler at the bottom
at the back.
Fitting the boiler:
Position the boiler centrally in front of the wall
■
mounting bracket. Use the outer ends of the wall
mounting bracket to line up the boiler.
■ Lower the boiler vertically into position.
■ The supporting surface of the boiler must rest on
the fitting assembly.
110
09. Insert 4 screws into the fitting assembly from
below.
Torque 3 Nm.
Do not tighten the screws with a cordless screw-
driver.
10. Tighten the union nut on the gas pipe.
Torque 30 Nm.
Danger
Escaping gas leads to a risk of explosion.
Check the fitting for gas tightness.