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7.5
Configuring the System
Check gas pressure here
17-21 mbar
Working gas Pressures
If the pressure drops are greater than shown
above a problem with the pipework or connections
is indicated. Permissible pressure drop across
system pipework < 1 mbar.
7726858-01 (1/19)
7.5.1
1. Ensure that all controls are calling for heat and maximum load
is applied to the system.
2. With the boiler operating in the maximum rate condition check
that the operational (working) gas pressure at the inlet gas
pressure test point is in accordance with B.S. 6798 & B.S. 6891.
This must be AT LEAST 17mb at the valve & 18mb at the gas
cock ! (Fig. 41).
3. Ensure that this inlet pressure can be obtained with all other
gas appliances in the property working.
Measure the gas Rate
4. With any other appliances & pilot lights turned OFF the gas
rate can be measured. It should be as shown in Section 3.1
Technical Data.
5. For IE, it is necessary to complete a "Declaration of
Conformity" to indicate compliance with I.S. 813. An example of
this is given in I.S. 813 "Domestic Gas Installations". This is in
addition to the Benchmark Commissioning Checklist.
Gas Valve
Gas Cock
18-22 mbar
19-23 mbar
Gas Meter
Fig. 41
Check the Operational (Working) gas inlet
Pressure
Commissioning
7
600 Heat
45
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