Component Access; Fan Pressure Test; Checking Heat Exchanger Assembly; Check Working Gas Inlet Pressure - Worcester Greenstar 2000 Installation And Maintenance Instructions Manual

Inspection and maintenance
9.3

Component access

Removing the front casing
The front casing is secured with two screws which are critical to maintain
the case seal and to prevent unauthorised removal (electrical safety).
▶ Always secure the casing with these screws.
▶ Loosen the two screws [1] and pull the bottom of the casing forward.
▶ Lift off the casing.
Fig. 71 Removing the front casing
9.4

Fan pressure test

NOTICE
Fan pressure test
▶ The appliance must be running at maximum output in chimney sweep
mode for the fan pressure test, ( Setting the appliance to
maximum).
This test is to determine if the heat exchanger requires cleaning or
additional actions.
Fan pressure test reading.
▶ The pressure reading will be in negative values.
60
9.4.1
▶ Remove the front casing.
▶ Remove the cap from the test nipple, and connect a pressure gauge.
Fig. 72 Test nipple at the mixing device
Appliance fan pressure test values
Natural Gas and LPG appliances
Table 32 Natural Gas and LPG values
1
If the manometer reading is within tolerance, in the white area of the
table values.
▶ The heat exchanger/exhaust path/siphon does not require attention.
If the manometer reading is out of tolerance, in the shaded area of the
table values then carry out the following checks.
▶ Check that the siphon is not restricted or blocked.
▶ Check the exhaust paths for restrictions.
▶ Clean the heat exchanger with a suitable cleaning tool, refer to
▶ Re-check the fan pressure readings.
▶ Switch the appliance off after completing pressure check.
▶ Disconnect the digital manometer and replace the test point cover.
9.5
Gas inlet pressure
▶ Do not continue with the other checks if the correct gas inlet pressure
▶ Check the gas supply working pressures in the system conform to the

Checking heat exchanger assembly

Appliance Cleaning required
output
 -4.7 mbar -4.8 mbar  -12 mbar
30kW 0 mbar
 -3.2 mbar -3.3 mbar  -12 mbar
25kW 0 mbar
cleaning section.
If the appliance, after completing the above checks, fails the fan
pressure test then contact Worcester, Bosch Group for advice.

Check working gas inlet pressure

NOTICE
can not be achieved at maximum output.
readings shown in the table shown in chapter 6.6 "Checking gas inlet
pressure".
Greenstar 2000 – 6 721 820 552 (2021/02)
No cleaning required
Value