Commissioning; Checking The Gas Inlet Pressure; Checking The Gas Rate - Bosch Condens 5000W Installation And Maintenance Instructions Manual

Commissioning

5.5 Commissioning
The combustion settings on this gas-fired boiler have been checked,
adjusted and preset at the factory for operation on the gas type defined
on the data plate.
No measurement of the combustion values is necessary provided there
is a meter installed allowing the gas rate to be checked.
▶ Do not adjust the air/gas ratio valve!
Having checked:
▶ That the boiler has been installed in accordance with the installation
instructions.
▶ The integrity of the flue system and flue seals, as described in section
6.3 of this manual.
▶ The integrity of the boiler combustion circuit and relevant seals.
5.5.1

Checking the gas inlet pressure

The inlet pressure to the boiler must be checked using the following
procedure:
Measuring the inlet pressure
▶ Close gas isolation valve.
▶ Slacken the screw in the inlet pressure test point [1] and connect a
manometer.
▶ Open gas isolation valve.
▶ Measure the pressure with the boiler running at maximum.
– Press service button for more than ten seconds and set CH
temperature to maximum.
– The service button will illuminate continually and the blue power
indicator will pulse five times.
▶ Check the gas supply working pressure at the gas valve conforms to
values for the appropriate gas type shown in Figures 59 and 60.
Ensure inlet pressure is satisfactory with all other gas appliances
working.
1
Fig. 58 Inlet pressure test point
34
Gas pressure within the system
Refer to the figures below for Natural Gas or LPG pressures.
If the pressure drops are greater than shown below, then this would
indicate a problem with the pipe work or connections within the system.
Fig. 59 Natural Gas pressures
Fig. 60 LPG pressures
Do not continue commissioning until the correct gas pressure is
achieved.
5.5.2
▶ The gas rate should be measured at the gas meter after 10 minutes
▶ Where a gas meter is not available (e.g. LP gas) the CO/CO
▶ If pressure and gas rate are satisfactory press the service button
6720643895-53.1Wo
▶ Close the gas isolation valve.
▶ Remove the manometer.
▶ Re-seal the screw in the gas inlet pressure test point.
▶ Open the gas isolation valve.
▶ Ensure that there are no gas leaks.
▶ Replace the outer case.
Meter
Natural Gas
1.13 kPa
0.03 kPa
drop
LPG
Meter/Regulator
2.75 kPa
0.25 kPa
drop
0.05 kPa
drop
NOTICE:

Checking the gas rate

operation at maximum.
See technical data section at the front of this manual.
checked to the units shown in the setting of the air/gas ratio, refer to
section 6.6 "Setting the air/gas ratio".
again and the boiler will return to normal operation.
– If left in the service mode the control will return to normal
operation after 15 minutes.
Bosch Condens 5000W – 6 720 646 195 (2018/10)
Gas Control
valve
1.1 kPa
6720646195-05.2Wo
Gas Control
valve
2.72 kPa
0.15 kPa
drop
6720646195-06.2Wo
must be
2