Thermador Professional PRO HARMONY PRG30 Manuel D'installation page 16

CAUTION:
The appliance must be isolated from the gas supply
piping system by closing its individual manual shut-off
valve during any pressure testing of the gas supply
piping system at test pressures equal to or less than 1/2
psig (3.5kPa.).
The appliance and its individual shut off valve must be
disconnected from the gas supply piping system during
any pressure testing of the system at test pressures in
excess of 1/2 psig (3.5kPa.).
When checking the manifold gas pressure, the inlet
pressure to the regulator should be at least 6.0" (14.9
mb) W.C. for natural gas or 11.0" (27.4 mb) for propane.
Do not attempt any adjustment of the pressure regulator.
Figure 9: Location of Gas Supply Inlet Connection
English 14
Figure 10: Location of Gas Supply Inlet Connection on 48"
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Ranges