Ideal Logic Combi (24, 30, 35)
Combi, natural gas
Combustion figures
| Figure | Natural gas (G20) |
|---|---|
CO₂ at high rate | Not given in MI |
CO₂ at low rate | Not given in MI |
Maximum CO More infoHide infoFrom the commissioning CO and combustion ratio flowchart, measured at the flue gas sampling point. The MI says the air/gas ratio valve is factory-set and must not be adjusted. |
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CO/CO₂ ratio More infoHide infoFrom the commissioning flowchart. The servicing schedule (Frame 36) says if the ratio is greater than 0.004, and flue integrity, combustion circuit seals, inlet pressure and gas rate have been checked, contact Ideal. |
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O₂ | Not given in MI |
Working inlet pressure More infoHide infoMI: minimum permitted operating pressure of 18 mb delivered to the appliance inlet, allowing 1 mb loss across the pipework from a minimum meter outlet of 19 mb. Checked at the gas cock test point with the boiler at maximum rate (hot tap fully open). The MI also says the 1:1 gas valve gives full output at inlet pressures as low as 14 mb, and gives a graph of pressure drop across the gas cock against heat input. Fault finding asks for more than 18 mbar at the boiler inlet. |
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Gas rate at maximum More infoHide infoMaximum DHW input (Table 3). Check at the gas meter with the boiler at full DHW output and no other appliance in use. Maximum CH input is 2.512 m³/h on all sizes (Table 2). Based on a gross CV of 38.7 MJ/m³. |
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Flue integrity More infoHide infoAt the air inlet sample point, boiler at maximum rate. The MI passes the check if either figure is met (O₂ more than or equal to 20.6% OR CO₂ less than or equal to 0.2%). | O₂ ≥ 20.6% CO₂ ≤ 0.2% |
From UIN 204626 A12 (January 2014)
Enter service mode for high and low rate
High rate
Steps not added yet. Follow the MI.
Low rate
Steps not added yet. Follow the MI.
Ending the test: follow the MI.
Models and GC numbers
| Model | GC number | Gas |
|---|---|---|
| Logic Combi 24 | 47-348-56 | NG |
| Logic Combi 30 | 47-348-57 | NG |
| Logic Combi 35 | 47-348-58 | NG |
Source: Ideal Logic Combi 24, 30, 35 Installation and Servicing, UIN 204626 A12 (January 2014).
Sections: Table 1 General data; Tables 2 and 3 Performance data; Gas supply; 31 Commissioning and testing; 32 Initial lighting; 33 General checks; 36 Servicing schedule; 73 and 76 Fault finding; Flowchart for CO level and combustion ratio check, including setting to minimum rate.
Spotted something wrong? Tell us.
Check these figures against the MI for the appliance in front of you, matched by GC number and manual date. Combustion work needs a calibrated analyser and a Gas Safe registered engineer.