Measuring The Inlet Gas Pressure (Flow Pressure) - Buderus Logamax plus GB142-24 Servicing Instructions

8.1.25 Measuring the inlet gas pressure (flow pressure)

 Switch off the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "0" (Off).
 Remove the casing.
 Open at least one thermostatic radiator valve.
 Close the gas shut-off valve (see fig. 56, pos. 1).
 Open the screw plug on the testing nipple for the inlet gas pres-
sure (see fig. 57, pos. 1) by two turns.
 Set the pressure gauge to zero.
 Connect the measuring hose of the pressure gauge to the
testing nipple (see fig. 57, pos. 2).
 Carefully open the gas shut-off valve (see fig. 56, pos. 2).
 Switch on the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "1" (On).
 Put the heating boiler into operation, see "Flue gas test" menu
on page 10.
 Measure the inlet gas pressure when the "Burner" (On/Off) LED
on the BC10 basic controller lights.
 The inlet gas pressure must be:
– for natural gas – min. 3.5 to 10.5 inch W.C (8.7 to 26.1
mbar), nominal supply pressure 7.0 inch W.C. (17,4 mbar)
– for LPG – min. 8.0 to 13.0 inch W.C. (19.9 to 32.3 mbar),
nominal supply pressure 11.0 inch W.C. (27.4 mbar).
 Set the main switch on the BC10 to "0" (Off).
 Close the gas shut-off valve (see fig. 56, pos.1).
 Remove the hose and tighten the screw plug on the testing
nipple again.
 Open again the gas shut-off valve (see fig. 56, pos. 2).
 Check the testing nipple for leaks.
 Fit the casing.
 Set the main switch on the BC10 to "1" (On).
NOTE!
If the required inlet gas pressure is not available,
you should consult your gas utility company. If the
inlet gas pressure is too high, a gas pressure regu-
lator is to be integrated upstream of the gas valve.
Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
fig. 56 Gas shut-off valve closed (1), gas shut-off valve
open (2)
fig. 57 Measure the inlet gas pressure
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