Ideal Logic + System (s15, s18, s24, s30)
System boiler, natural gas only
Combustion figures
| Figure | Natural gas (G20) |
|---|---|
CO₂ at high rate More infoHide infoThe MI gives no CO₂ setting figures. The air/gas ratio valve is factory-set and must not be adjusted during commissioning. | Not given in MI |
CO₂ at low rate | Not given in MI |
Maximum CO More infoHide infoAt maximum and minimum rate, at the flue gas sampling point, readings allowed to stabilise (commissioning flowchart, MI p. 65). | Less than 350 ppm |
CO/CO₂ ratio More infoHide infoAt maximum and minimum rate (commissioning flowchart, MI p. 65). At service (MI 3.1), if the ratio is greater than 0.004 after flue integrity, combustion seals, inlet pressure and gas rate are verified, contact Ideal. | Less than 0.0040 |
O₂ | Not given in MI |
Working inlet pressure More infoHide infoChecked at maximum rate at the inlet pressure test point on the gas service cock (MI 2.22). MI 1.8 gives a minimum permitted operating pressure of 18mb at the appliance inlet, allowing 1mb loss from a minimum meter outlet of 19mb, and says the boiler can deliver full output at inlet pressures as low as 14mb. The external gas cock can reduce the pressure read at its test point (the drop rises with heat input: see the graph in MI 1.8). Gas supply: 2H – G20 – 20mbar (Table 1). |
|
Gas rate at maximum More infoHide infoGas consumption, central heating, Table 2. Calculated using a calorific value of 38.7 MJ/m³ gross (34.9 MJ/m³ nett). |
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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% (commissioning flowchart, MI p. 65). | O₂ ≥ 20.6% CO₂ ≤ 0.2% |
From UIN 215353 A01 (July 2016)
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 + System s15 | 41-750-65 | NG |
| Logic + System s18 | 41-750-66 | NG |
| Logic + System s24 | 41-750-67 | NG |
| Logic + System s30 | 41-750-68 | NG |
Source: Ideal Logic + System s15 s18 s24 s30 Installation and Servicing, UIN 215353 A01 (July 2016).
Sections: Table 1 General data; Table 2 Performance data; 1.8 Gas supply; 2.22 Commissioning and testing; 2.23 Initial lighting; 2.26 Accessing the installer mode; 3.1 Servicing schedule; 4.3 L2 ignition lockout; Flowchart for CO level and combustion ratio check (MI p. 64–65).
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.