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Bosch 660 EF User Manual page 22

Indoor model/ natural gas/lp gas boilers
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Installation instructions
Measuring Gas Pressure
• In order to check the gas supply pressure to the unit,
a tap is provided on the gas inlet. Remove the hex
head philips screw from the tap, and connect a
manometer using a silicon tube.
• In order to check the gas manifold pressure, a pair of
taps are provided on the gas valve inside the unit.The
pressure can be checked either by removing the hex-
head philips screw and connecting a manometer
with a silicon tube, or by removing the 1/8" NPT
screw with an allen wrench and connecting the
appropriate pressure gauge.
22
Fig. 23
6 720 644 063

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660 efo