Glow-worm Xtramax - Manual (Page 27)

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15 Changing Gas Type
Bypass
The XTRAMAX boiler has a built-in bypass, see diagram 16.1.
The boiler is supplied with the bypass open half a turn. It should
not be necessary to adjust the bypass, but if required ensure
that under no circumstances does the flow rate fall below the
figures specified, refer to diagram 1.1. (turn clockwise to close
the valve).
Diagram 16.1
9349
a
Should it become necessary to change the gas type, a
modification kit will be required.
This modification must only be carried out by a suitably qualified
engineer.
Conversion natural Gas (G20) to G30/G31 Part No. 86631.
16 Settings