Ideal Logic Max Combi² (C24, C30, C35)
Combi, natural gas
Combustion figures
| Figure | Natural gas (G20) |
|---|---|
CO₂ at high rate More infoHide infoTable 1 gives this as CO₂ content at Max. DHW (sizes shown as 24 kW, 30 kW and 35 kW). Measured at the flue gas sampling point. The air/gas ratio valve is factory set and must not be adjusted. |
|
CO₂ at low rate More infoHide infoTable 1 gives this as CO₂ content at Min. CH. |
|
Maximum CO More infoHide infoFrom the Benchmark CO level and combustion ratio flowchart: check at maximum rate, then at minimum rate. | Less than 350 ppm |
CO/CO₂ ratio More infoHide infoFrom the Benchmark flowchart, checked at maximum and minimum rate. The servicing schedule (MI 3.1) says if the ratio is greater than 0.004 at maximum rate, carry out the cleaning procedure. | Less than 0.0040 |
O₂ | Not given in MI |
Working inlet pressure More infoHide infoMI 1.9: allowing 1 mbar loss across the pipework from a minimum meter outlet of 19 mbar, a minimum operating pressure of 18 mbar will be delivered to the appliance inlet. The 1:1 gas valve lets the boiler give full output down to 14 mbar, but other appliances may not be as tolerant. The external gas cock can further reduce the pressure measured at its test point (graph in MI 1.9). Table 1 gas supply: 2H - G20 - 20 mbar. Check at the gas inlet pressure test point at maximum rate (DHW tap fully open). |
|
Gas rate at maximum More infoHide infoMaximum DHW input gas consumption (Table 3). Maximum CH input is 2.512 m³/h on all sizes (Table 2). Based on a calorific value of 38.7 MJ/m³ gross. Check at the gas meter at full DHW output with no other appliance in use. |
|
Flue integrity More infoHide infoAt the air inlet test point, boiler at maximum rate. The MI says O₂ more than or equal to 20.6% OR CO₂ less than or equal to 0.2%. | O₂ ≥ 20.6% or CO₂ ≤ 0.2% |
From UIN 228290 A06 (October 2022)
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 Max Combi² C24 | 47-387-03 | NG |
| Logic Max Combi² C30 | 47-387-04 | NG |
| Logic Max Combi² C35 | 47-387-05 | NG |
Source: Ideal Logic Max Combi² C24 C30 C35 Installation & Servicing, UIN 228290 A06 (October 2022).
Sections: 1.9 Gas Supply; Table 1 General Data; Tables 2 and 3 Performance Data; 2.24 Commissioning and Testing; 2.25 Initial Lighting; 2.31 Setting Maximum and Minimum Rates; 2.32 General Checks; 3.1 Servicing Schedule; Section 6 Flowchart for CO level and combustion ratio check.
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.