Glow-worm Ultracom2 cxi - Manual (Page 39)

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MAINTENANCE
16 Gas conversion adjustments
In order to operate with a gas other than that provided from the
factory, it is necessary to some adjustments to the gas valve.
This conversion should only be carried out by a competent
person approved at the time by the Health and Safety
Executive.
• During the conversion to Propane, use of a suitable flue gas
analyser is necessary.
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 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.
16.1 Settings
i
Steps "Switching on" to "Re-pressurising System"
will need to be completed before the appliance can
be converted (See chapter "Commissioning").
Tools required to make the conversion are a 4mm Allen key and
an electricians screwdriver.
Having checked :
- the appliance and system have been installed in
accordance with the instructions.
- the integrity of the flue system and flue seals....
- the integrity of the appliance combustion circuit and relevant
seals....
- that all internal/external controls are calling for heat.
- the gas service isolation valve is opened.
24
2 3
1
2B
2A
Key
1 Throttle
2 Combustion analyser sample point
2A flue elbow
2b Vertical flue adaptor
3 Cap
• Remove the front panel first.
• Remove the cap (3) and connect a CO2 analyser to effect
the measurement (2).
16.1.1 Adjusting the gas valve
• Press the on/off button to turn the appliance off.
• Turn the screw in the direction and the number of times
indicated in the following table.
Gas adjustment Model G20 ► G31 G31 ► G20
24cxi 2 turns
30cxi 3 turns
35cxi 2.5 turns
24cxi 2 turns
30cxi 3 turns
35cxi 2.5 turns
16.1.2 Adjusting the maximum power setting
• Activate the test mode "P.01" and set the value to 100 in
order to force the burner at P. max. See chapter "Specific
adjustment ► Appliance technical settings and parameter list
► Test modes".
• Wait approximately 5 minutes to read a stabilized CO2 value.
• Compare the value measured with the values indicated in the
table below.