Ideal Checked against MI

Ideal Logic+ Heat (H12, H15, H18, H24, H30)

Heat only, natural gas

Combustion figures

Figure	Natural gas (G20)
CO₂ at high rate More infoHide info Table 1 gives CO₂ at Max. CH and Min. CH, with a tolerance of ± 0.7. Measure at the flue gas sampling point and let the readings stabilise. The air/gas ratio valve is factory set and must not be adjusted.	H12 9.1% ± 0.7 H15, H30 9.3% ± 0.7 H18, H24 9.5% ± 0.7
CO₂ at low rate	H12 8.5% ± 0.7 H15, H24, H30 8.8% ± 0.7 H18 8.9% ± 0.7
Maximum CO More infoHide info Check at maximum and minimum rate, from the commissioning flowchart. Do not run the boiler with the front panel off.	Less than 350 ppm
CO/CO₂ ratio More infoHide info At maximum and minimum rate, from the commissioning flowchart. The servicing schedule (MI 3.1) writes 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 Check at maximum rate at the inlet pressure test point on the gas service cock. MI 1.8: minimum meter outlet 19 mbar; allowing 1 mbar loss across the pipework, 18 mbar minimum at the appliance inlet. The gas cock can reduce the reading at its test point further, depending on heat input (graph in MI 1.8). The 1:1 gas valve can give full output at inlet pressures as low as 14 mbar. Gas supply in Table 1: 2H - G20 - 20 mbar.	Appliance inlet 18 mbar minimum
Gas rate at maximum More infoHide info From Table 2, calculated at a calorific value of 38.7 MJ/m³ gross. Check at the meter with the boiler at maximum output and no other appliance in use.	H12 1.246 m³/h H15 1.537 m³/h H18 1.872 m³/h H24 2.512 m³/h H30 3.135 m³/h
Flue integrity More infoHide info At the air inlet test point, boiler at maximum rate. The MI flowchart passes the check if O₂ is 20.6% or more OR CO₂ is 0.2% or less.	O₂ ≥ 20.6% CO₂ ≤ 0.2%

From UIN 215355 A10 (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+ Heat H12	41-750-82	NG
Logic+ Heat H15	41-750-83	NG
Logic+ Heat H18	41-750-84	NG
Logic+ Heat H24	41-750-85	NG
Logic+ Heat H30	41-750-86	NG

Source: Ideal Logic+ Heat H12 H15 H18 H24 H30 Installation & Servicing, UIN 215355 A10 (February 2019).

Sections: Table 1 General Data; Table 2 Performance Data; 1.8 Gas Supply; 2.25 Commissioning and Testing; 2.26 Initial Lighting; 2.27 General Checks; 2.29 Accessing the Installer Mode; 3.1 Servicing Schedule; 4.3 L2 Ignition Lockout; Flowchart for CO level and combustion ratio check on commissioning (MI p. 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.