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Check the operational (working) gas inlet pressure
Set up the boiler to operate at maximum rate as described in section Test
mode of section 3.3.
With the boiler operating in the maximum rate condition check that the
operational (working) gas pressure at the inlet gas pressure test point (see
fig. 25) complies with the requirements of section 4.4.
Ensure that this inlet pressure can be obtained with all other gas appliances
in the property working.
Measure the gas rate
Measure the gas rate and check against following table:
BOILER MODEL
OPTIMAX HE PLUS 18 S
OPTIMAX HE PLUS 25 S
OPTIMAX HE PLUS 35 S
3.4 Routine servicing, maintenance & repair
General
PLEASE NOTE: During routine servicing, and after any maintenance or change of part of the combustion circuit, we
recommend that the following is 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, as described in section 4.4;
•
The gas rate, as described in section 4.4;
•
The combustion performance, as described in section 3.4 Combustion check.
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 70 kW 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 accor-
dance with the analyser manufacturers' 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 BS 7967, Parts 1 to 4.
Periodical check
To keep the unit working properly over time, it is necessary to have qualified personnel make an annual check that inclu-
des the following tests:
•
The control and safety devices (gas valve, flow meter, thermostats, etc.) must function correctly.
•
The fume extraction circuit must be fully efficient.
•
The airtight chamber must be sealed
•
The air-flue terminal and ducts must be free of obstructions and leaks
•
The condensate evacuation system must be efficient with no leakage or obstructions.
•
The burner and exchanger must be clean and free of scale. When cleaning, do not use chemical products or wire brushes.
•
The electrode must be free of scale and properly positioned.
•
The gas and water systems must be airtight.
•
The water pressure in the cold water system must be about 1 bar; otherwise, bring it to that value.
•
The circulation pump must not be blocked.
22
GAS RATES (NATURAL GAS)
AFTER 10 MINUTES FROM COLD
Maximum rate
m
/h
ft
/h
3
3
1.90
67.20
2.67
94.44
3.68
130.16
Cod. 3540R543 - 08/2012 (Rev. 00)
OPTIMAX HE PLUS S
fig. 25
Minimum rate
m
/h
3
0.32
0.56
1.10
ft
/h
3
11.32
19.81
38.91
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