Gas Valve - Vaillant TURBOmax Pro 28 Instructions For Installation And Servicing

PARTS REPLACEMENT
6
Fig. E.5a: Gas valve
11
12
Fig. E.5b: Gas valve
48
2
1
4
3
5
7
9
8
10
13
14

Gas valve

Refer to the important information
and initial preparation on page 45.
Loosen screw and pull electrical
plug off the gas valve.
Pull off the two modulating coil
wires.
Disconnect air tube from gas valve.
Undo nut (1) on the gas valve
outlet connection.
Undo compression nut on the outlet
of the gas service valve.
Pull off the locating spring (8)
Remove complete gas valve
assembly and inlet pipe from the
boiler.
Remove both inlet pipe (12) and
outlet (14) connection from the gas
valve by removing the eight secu-
ring screws (11 and 13) and refit to
new gas valve using new seals
provided.
Reassemble in reverse order and
test all joints for soundness.
Set ignition and main burner
pressure as detailed in these
instructions.