13 servicing, General inspection, Maximum rate check and adjustment – Glow-worm Ultrapower sxi Range User Manual

Page 44

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44

13 Servicing

General Inspection

Prior to, during servicing and after any maintenance or

changed parts, the following must be checked.

● The integrity of the flue system and flue seals.

● The integrity of the appliance combustion circuit and

relevant seals.

● Electrical, gas and water connections.

● System pressure.

● the combustion performance, refer to the following

procedure.

● The operational gas inlet pressure and gas rates, refer to

the commissioning section paragraph 12.7.

Correct any fault before continuing.

COMPETENCY TO CARRY OUT THE CHECK

OF COMBUSTION PERFORMANCE

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 must

be 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 manufacturers’ requirements.

● 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.

● Ensure that the gas analyser is set to the correct fuel

setting.

● Select the “

°C

bar

°C

bar

”, constant central heating with DHW

function by pressing the “Mode” button repeatedly, refer to

commissioning section. The boiler should fire automatically.

NOTE: Safe combustion can only be verified by measuring

CO/CO2 ratio. This must not exceed the value shown in the

table opposite.

COMBUSTION CHECK AND SETTING THE AIR/

GAS RATIO VALVE

● Remove the front casing panel, see diagram 13.2 and hinge

down the control box. Taking care not to touch any internal

components, proceed as follows:

● Connect the CO2 combustion analyser to the relevant test

point, see diagram 13.1.

IMPORTANT NOTES:

1. To ensure the continued efficient and safe operation of the boiler it is recommended that it is checked and serviced at

regular intervals. The frequency of servicing will depend upon the particular installation and usage, but in general

once a year should be enough.

2. It is the Law that any servicing is carried out by a

competent person approved at the time by the Health and Safety

Executive.

3. Before commencing with a service or replacement of parts the boiler should be isolated from the electrical supply and the

gas supply should be turned off at the gas isolation valve.

4. When replacing a part on this appliance, use only spare parts that you can be assured conform to the safety and

performance specification that we require. Do not use reconditioned or copy parts that have not been clearly authorised

by Glow-worm.

5. If any electrical connections have been disconnected and after their connection, checks to the earth continuity, polarity,

short circuit and resistance to earth must be repeated using a suitable multimeter, as described in section 14.

6. After servicing, complete the relevant Service Interval Record section of the Benchmark Checklist located in the centre

pages of this document.

13760

14052

13347

FLUE ELBOW

FLUE GAS

ANALYSER

TEST POINT

FLUE DUCT

EXTENSION

Diagram 13.1

1. Maximum Rate Check and Adjustment

NOTE: To verify the maximum gas rate CO2 setting the

appliance must be checked at the maximum rate first.

Press the “reset” button on the controls fascia, release

and immediately press and hold in the “+” button. After

approximately 5 seconds “Hi” will be displayed. Pressing

the mode button when “Hi” is selected will force the boiler

to maximum rate, the display will flash between “Hi” and the

“default display” this will indicate the boiler has been forced to

maximum. Wait until the CO2 value is stable and check that

the value is within the range specified in table in the “check”

column.

2.4

2.4

10.2 ± 0.5 10.0 ± 0.5
10.2 ± 0.5 10.0 ± 0.5

100sxi

GAS RATES (G31)

(approx)

after 10 mins from cold

MIN

kg/hr

MAX

kg/hr

(Case Off)

(Case On)

0.7

0.7

BURNER % CO

2

(nominal)

Model

0.004
0.004

CO/CO

2

RATIO

170sxi

9.2 ± 0.5 9.0
9.2 ± 0.5 9.0

100sxi

170sxi

GAS RATES (G20)

(approx)

after 10 mins from cold

MIN

m

3

/h ft

3

/h

MAX

m

3

/h ft

3

/h

(Case Off)

(Case On)

BURNER % CO

2

(nominal)

Model

0.48

3.30

0.004
0.004

116.5

3.30 116.5

16.8

0.48 16.8

CO/CO

2

RATIO

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