Servicing And Spares; Inspection And Spares; Inspection; Checking Flue Integrity - Bosch Worcester GREENSTAR CDi CLASSIC REGULAR ErP Series Installation, Commissioning And Servicing Instructions

SERVICING AND SPARES

6 SERVICING AND SPARES
CAUTION: Isolate the mains gas supply before starting
any work and observe all relevant safety precautions.
NOTICE: After replacement of any components always
check for gas tightness where relevant and carry out
functional checks as described in commissioning. Any
O-rings or gaskets that are disturbed during servicing
must be replaced.
6.1

Inspection and spares

NOTICE: Any service work must be carried out by a
competent registered engineer such as British Gas or
Gas Safe.
NOTICE: CO/CO Analyser
2
▶ Service work must NOT be attempted if a calibrated
CO/CO Analyser is NOT available.
2
• To ensure the continued efficient operation of the appliance it must
be checked at regular intervals.
• The frequency of servicing will depend upon the particular
installation conditions and usage. However, an annual service is
recommended.
• The extent of the service required by the appliance is determined by
the operating condition of the appliance when tested by fully
qualified engineers.
6.1.1

Inspection

1. Check that the terminal and the terminal guard, if fitted, are clear and
undamaged.
2. If the appliance is in a compartment or cupboard check that the
specified service space around the appliance is clear.
3. Check all the joints and connections in the system and remake any
that show signs of leakage. Refill and re-pressurise if applicable as
described in Commissioning.
▶ Operate the appliance and take note of any irregularities. Call up the
last fault stored by the Bosch Heatronic, Service Function .0. Refer to
Fault Finding for rectification procedures.
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6.1.2

Checking flue integrity

The integrity of the flue system and performance of the boiler can be
checked via the flue turret sample points.
Flue gas sample point
Air inlet sample point
Table 20 Key to figure 53
2
1
6720643895-67.1Wo
Fig. 53 Flue turret test points
With the boiler case on and the boiler running at maximum output (refer
to paragraph "SET THE BOILER TO MAXIMUM", page 35).
▶ Ensure that the probe reaches the centre of the air intake, adjust the
cone on the probe so that it seals the sample point and correctly
positions the end of the probe.
▶ Insert the analyser probe into the air intake sample point.
▶ Allow the readings to stabilise and check that:
– O is equal to, or greater than 20.6%.
2
– CO is less than 0.2%
2
▶ If the readings are outside these limits then this indicates that there
is a problem with the flue system or combustion circuit, e.g. missing
or dislodged seals.
1
Fig. 54 Flue integrity test
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2
1
2
1
2
6 720 815 723 (2015/05)