Ideal Checked against MI

Ideal Logic Max System S (15, 18, 24, 30)

System boiler, natural gas

Combustion figures

Figure	Natural gas (G20)
CO₂ at high rate More infoHide info Table 1, CO₂ content at Max. CH. The combustion is set at the factory: the MI says do not adjust the air/gas ratio valve.	15, 30 9.3% ± 0.7 18, 24 9.5% ± 0.7
CO₂ at low rate More infoHide info Table 1, CO₂ content at Min. CH.	15, 24, 30 8.8% ± 0.7 18 8.9% ± 0.7
Maximum CO More infoHide info At maximum and minimum rate (combustion check flowchart). Allow readings to stabilise before recording.	Less than 350 ppm
CO/CO₂ ratio More infoHide info At maximum and minimum rate (combustion check flowchart). The servicing schedule (3.1) gives the same limit as 0.004: above it, go to the cleaning procedure.	Less than 0.0040
O₂	Not given in MI
Working inlet pressure More infoHide info Check at maximum rate at the inlet gas pressure test point on the gas service cock, with all other gas appliances working. Supply is G20 20 mbar. The MI says 18 mb is the minimum delivered to the appliance inlet, allowing 1 mb loss across the pipework from a minimum meter outlet of 19 mb, and that the gas cock can reduce the pressure further when measured at its test point (pressure drop graph, MI p. 12). It also says the boiler can give full output down to 14 mb.	Appliance inlet 18 mbar minimum
Gas rate at maximum More infoHide info Table 2, central heating maximum. Calculated with a gross CV of 38.7 MJ/m³. Minimum: 0.500 m³/h (15, 18, 24), 0.622 m³/h (30).	15 1.537 m³/h 18 1.872 m³/h 24 2.512 m³/h 30 3.135 m³/h
Flue integrity More infoHide info At the air inlet test point, boiler at maximum. The MI says O₂ ≥ 20.6% OR CO₂ ≤ 0.2%.	O₂ ≥ 20.6% CO₂ ≤ 0.2%

From UIN 219009 A04 (February 2019)

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 System S 15	41-796-13	NG
Logic Max System S 18	41-796-14	NG
Logic Max System S 24	41-796-15	NG
Logic Max System S 30	41-796-16	NG

Source: Ideal Logic Max System S 15 18 24 30 Installation & Servicing, UIN 219009 A04 (February 2019).

Sections: 1 General, Table 1 General Data and Table 2 Performance Data (MI p. 8); GC numbers (MI p. 9); 1.8 Gas Supply; 2.22 Commissioning and Testing; 2.23 Initial Lighting; 3.1 Servicing Schedule; 4.3 L2 Ignition Lockout; Flowchart for CO level and combustion ratio check on commissioning, including setting to maximum and minimum rate (MI pp. 64-65).

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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.