Servicing; Servicing Schedule - Zanussi ULTRA+ COMBI 30 Installation And Servicing

3.1 SERVICING SCHEDULE

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WARNING. Always turn OFF the gas supply at the gas service cock, and switch OFF and disconnect the electricity
supply to the appliance before servicing.
Combustion testing must be carried out by a competent person using a combustion analyser conforming to BS7927.
To ensure the continued safe and efficient operation of the appliance it is recommended that it is checked at regular intervals and
serviced as necessary. The frequency of servicing will depend upon the installation condition and usage but should be carried out
at least annually.
It is the law that any service work must be carried out by a Gas Safe Registered Engineer. In IE service work must be carried out
by a Registered Gas Installer (RGII).
Note. In order to carry out either servicing or replacement of components
the boiler front panel must be removed. Refer to Section 3.2.
PRELIMINARY INSPECTION
1. Light the boiler and carry out a pre-service check, noting any
operational faults (refer to appropriate fault finding chart as
necessary).
2. Check the flue terminal (and terminal guard if fitted) is undamaged
and clear of any obstruction.
3. Check combustion by connecting the flue gas analyser to the flue
gas sampling point as shown in the diagram and measure CO and
CO at maximum rate. Repeat at minimum rate.
2
If the CO / CO ratio is greater the 0.004 please proceed to "Check
2
Procedure".
CHECK PROCEDURE
1. Check all water and gas joints for signs of leakage. Remake any
suspect joints ensuring a gas tightness check is carried out if
applicable and the water system is correctly refilled, vented and
re-pressurised.
2. Proceed to "IMPORTANT".
CLEANING PROCEDURE
1. Clean the main burner. Refer to Section 3.4.
2. Clean the heat exchanger & condensate trap/siphon. Refer to
Section 3.5 & 3.6.
3. Check the main injector for blockage or damage. Refer to Section 3.3.
ALSO IF THE DHW FLOW RATE IS IN QUESTION:
4. Check the DHW filter for blockage.
5. The cleaning procedures are covered more fully in Sections 3.3 -
3.7 and MUST be carried out in sequence.
6. Proceed to "IMPORTANT".
Do not operate the boiler if the front panel is not fitted.
IMPORTANT
1. If, for any reason, the condensate trap/siphon has been removed,
ensure the trap is refilled with water before re-assembling.
2. After completing the servicing or exchange of components always
test for gas tightness.
3. When work is complete the front panel MUST be correctly refitted,
ensuring that a good seal is made.
4. Complete the service section in the Benchmark Commissioning
Checklist.
Installation and Servicing
SECTION 3 - SERVICING
GENERAL
Please Note: During Servicing, and after any
maintenance or change of part of the combustion
circuit, the following must be checked:
- The integrity of the flue system and the flue seals.
- The integrity of the boiler combustion circuit and
the relevant seals.
- The operational (working) gas inlet pressure at
maximum rate.
- The gas rate.
- The combustion performance.
COMPETENCE TO CARRY OUT THE CHECK
OF COMBUSTION PERFORMANCE
Please Note: BS 6798:2009 Specification for
installation and maintenance of gas-fired boilers of
rated input not exceeding 70kW net advises that:
- The person carrying out a combustion
measurement should have been assessed as
competent in the use of a flue gas analyser and the
interpretation of the results.
- The flue gas analyser used should be one meeting
the requirements of BS7927 or BS-EN50379-3
and be calibrated in accordance with the analyser
manufacturer's requirements, and
- Competence can be demonstrated by satisfactory
completion of the CPA1 ACS assessment, which
covers the use of electronic portable combustion
gas analysers in accordance with BS7967, Parts 1
to 4.
Flue Sampling Point
Air Sample
Point
Ensure all caps and seals
are re-fitted after use
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