Ideal Checked against MI

Ideal Logic System² (S15, S18, S24, S30)

System boiler, natural gas

Combustion figures

Figure	Natural gas (G20)
CO₂ at high rate More infoHide info Table 1 General Data, CO₂ content at Max. CH. The air/gas ratio valve is factory set and must not be adjusted during commissioning.	15 kW 9.5% ± 0.7 18 kW 9.3% ± 0.7 24 kW 9.2% ± 0.7 30 kW 9.6% ± 0.7
CO₂ at low rate More infoHide info Table 1 General Data, CO₂ content at Min. CH.	15 kW 8.9% ± 0.7 18 kW 8.3% ± 0.7 24 kW 8.5% ± 0.7 30 kW 8.7% ± 0.7
Maximum CO More infoHide info Applies at maximum and minimum rate (Benchmark flowchart). Measured at the flue gas sampling point after readings stabilise.	Less than 350 ppm
CO/CO₂ ratio More infoHide info Applies at maximum and minimum rate (Benchmark flowchart). The servicing schedule (section 3.1) gives the same limit as 0.004: above it, carry out the cleaning procedure.	Less than 0.0040
O₂	Not given in MI
Working inlet pressure More infoHide info MI section 1.9: allowing 1 mb loss across the pipework from a minimum meter outlet of 19 mb, a minimum of 18 mb will be delivered to the appliance inlet. The boiler can give full output at inlet pressures as low as 14 mb. Table 1 gives the gas supply as 2H - G20 - 20 mbar. Check at the gas cock test point with the boiler at maximum rate.	Appliance inlet 18 mb minimum
Gas rate at maximum More infoHide info Table 2 gas consumption at Max, calculated using a calorific value of 38.7 MJ/m³ gross.	15 kW 1.537 m³/h 18 kW 1.872 m³/h 24 kW 2.512 m³/h 30 kW 3.136 m³/h
Flue integrity More infoHide info At the air inlet (air sample) 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% CO₂ ≤ 0.2%

From UIN 228297 A05 (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 System² S15 (15 kW)	41-796-85	NG
Logic System² S18 (18 kW)	41-796-86	NG
Logic System² S24 (24 kW)	41-796-87	NG
Logic System² S30 (30 kW)	41-796-88	NG

Source: Ideal Logic System² S15 S18 S24 S30 installation & servicing, UIN 228297 A05 (October 2022).

Sections: Table 1 General Data; Table 2 Performance Data; 1.9 Gas supply; 2.24 Commissioning and testing; 2.25 Initial lighting; 3.1 Servicing schedule; Section 6 Flowchart for CO level and combustion ratio check (setting to maximum and minimum rate).

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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.