Fan Pressure Test; Flue Gas Analysis - Bosch Condens 2000F30 Regular boiler Installation, Commissioning And Servicing Instruction Manual

40 | Servicing and spares
minimum pressure
Gas type (mbar)
G20 17
G25 22
G31 25
10.6

Fan pressure test

▶ Remove the bung from the fan pressure test point
Fig. 54 Fan pressure test point and cover
▶ Connect a manometer to the fan pressure test point, (1).
▶ Set the boiler to maximum output.
▶ After measurement replace test point cover.
Fig. 55 Fan control pressure test
NOTICE: Fan pressure test
▶ The boiler must be run at maximum output for the
fan pressure test.
With the combustion air intake pipe fitted and the boiler running at
maximum output, measure the fan pressure:
6 720 ... ... (YYYY/MM)
maximum pressure
(mbar)
25
30
45
▶ The pressure will read negative, refer to the chart in figure 56 below.
FAN PRESSURE TEST
Clean the Heat Ex.
NG Boilers
- 5.2
16kW:
- 5.3
30kW:
- 4.8
42kW:
0 -1 -2 -3
LPG Boilers
- 4.7
16kW:
- 5.6
30kW:
- 5.3
42kW:
0 -1 -2 -3
Fig. 56 Fan control pressure readings
▶ If the manometer reading is in the white area of the chart the heat
exchanger/exhaust path/trap does not require attention.
▶ If the manometer reading is in the black area of the chart then carry
out the following checks:
– Check that the condensate trap is not blocked.
– Check the exhaust paths for restrictions.
– Clean the heat exchanger with a suitable cleaning tool, refer to
section 10.9 - Cleaning the heat exchanger
▶ Re-check the fan pressure readings.
If the boiler, after completing the above checks, fails the fan pressure
test then contact your technical help-line for advice.
▶ After the measurements are taken switch the boiler off.
▶ Remove the combustion air intake pipe.
▶ Disconnect the manometer and replace the test point cover.
▶ Replace the combustion air intake pipe.
10.7

Flue gas analysis

NOTICE: Combustion testing
▶ Combustion testing must be carried out by a
competent person. Testing must not be attempted
unless the person carrying out the combustion check
is equipped with a calibrated Combustion Analyser
conforming to BS 7927 and is competent in its use.
NOTICE: Gas inlet pressure
▶ Ensure that the gas inlet pressure has been checked
and is satisfactory, refer to section 7.5
Combustion test
▶ Connect the flue gas analyser to the flue gas sampling point (1) as
shown in the figure below.
▶ Ensure that the probe reaches the centre of the flue gas exhaust,
adjust the cone on the probe so that it seals the sample point and
correctly positions the end of the probe.
1
2
Fig. 57 Flue turret
[1] Flue gas sample point
[2] Air inlet sample point
Heat Ex. ok
-4 -5 -6 -7 -8
mbar
-4 -5 -6 -7 -8
mbar
6720809859-22.1Wo
Product Name