Ideal Checked against MI

Ideal Logic Heat² H heat only (H12, H15, H18, H24, H30)

Heat only, natural gas

Combustion figures

Figure	Natural gas (G20)
CO₂ at high rate More infoHide info Table 1 General Data, CO₂ content (± 0.7), Max. CH. The table heads the sizes 12 kW to 30 kW. The air/gas ratio valve is factory set and must not be adjusted.	H12 9.1% ± 0.7 H15 9.4% ± 0.7 H18, H24 9.3% ± 0.7 H30 9.7% ± 0.7
CO₂ at low rate More infoHide info Table 1 General Data, CO₂ content (± 0.7), Min. CH.	H12 8.5% ± 0.7 H15, H30 8.8% ± 0.7 H18 8.7% ± 0.7 H24 8.4% ± 0.7
Maximum CO More infoHide info At maximum and minimum rate, from the Benchmark CO and combustion ratio flowchart. Probe in the flue gas sampling point, readings allowed to stabilise.	Less than 350 ppm
CO/CO₂ ratio More infoHide info At maximum and minimum rate (Benchmark flowchart). The servicing schedule (3.1) checks the ratio at maximum rate: above 0.004 go to the cleaning procedure, below 0.004 go to the check procedure.	Less than 0.0040
O₂	Not given in MI
Working inlet pressure More infoHide info MI gives a minimum only, no range: a minimum permitted operating pressure of 18 mb will be delivered to the inlet of the appliance (1.9). The ignition lockout chart says gas pressure at the boiler inlet over 18 mbar. Gas supply 2H - G20 - 20 mbar (Table 1). Minimum meter outlet 19 mb. MI says the 1:1 gas valve gives full output at inlet pressures as low as 14 mb. Measured at the test point on the gas service cock, boiler at maximum rate.	Appliance inlet 18 mbar minimum
Gas rate at maximum More infoHide info Gas consumption, Table 2. Calculated with a calorific value of 38.7 MJ/m³ gross. At minimum: 0.500 m³/h (H12, H15, H18, H24), 0.623 m³/h (H30).	H12 1.246 m³/h H15 1.537 m³/h H18 1.872 m³/h H24 2.512 m³/h H30 3.136 m³/h
Flue integrity More infoHide info At the air inlet (air sample) test point, boiler at maximum rate (Benchmark flowchart). MI wording: 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 228298 A04 (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 Heat² H12	41-860-10	NG
Logic Heat² H15	41-860-11	NG
Logic Heat² H18	41-860-12	NG
Logic Heat² H24	41-860-13	NG
Logic Heat² H30	41-860-14	NG

Source: Ideal Logic Heat² H12 H15 H18 H24 H30 Installation & Servicing, UIN 228298 A04 (October 2022).

Sections: Table 1 General Data; Table 2 Performance Data; Section 1 GC numbers (p. 7); 1.9 Gas Supply; 2.29 Commissioning and Testing; 2.30 Initial Lighting; 2.35 Accessing the Installer Mode; 3.1 Servicing Schedule; 4.3 L 02 Ignition Lockout; Section 6 Benchmark 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.