Ideal Checked against MI

Ideal Atlantic Combi (24, 30, 35)

Combi, natural gas

Combustion figures

Figure	Natural gas (G20)
CO₂ at high rate More infoHide info Table 1 gives this as CO₂ content at Max. DHW.	24, 35 9.5% ± 0.7 30 9.3% ± 0.7
CO₂ at low rate More infoHide info Table 1 gives this as CO₂ content at Min. CH.	24, 30 8.8% ± 0.7 35 8.9% ± 0.7
Maximum CO More infoHide info At maximum and minimum rate, at the flue gas sampling point, after readings stabilise (commissioning flowchart).	Less than 350 ppm
CO/CO₂ ratio More infoHide info At maximum and minimum rate (commissioning flowchart). The servicing section gives the same limit written as 0.004: above it, clean the boiler.	Less than 0.0040
O₂	Not given in MI
Working inlet pressure More infoHide info Checked at maximum rate (hot tap fully open) at the inlet pressure test point on the gas service cock. The MI says the gas cock can reduce the pressure further when measured at its test point, by an amount that depends on heat input (see the gas cock pressure drop graph in MI section 1.8). Minimum meter outlet: 19 mbar. The MI also says the boiler can give full output at inlet pressures as low as 14 mbar.	Appliance inlet 18 mbar minimum
Gas rate at maximum More infoHide info Maximum DHW gas consumption (Table 3), checked at the gas meter at full DHW output with no other appliance in use. Maximum CH gas consumption is 2.512 m³/h (Table 2). Based on a gross CV of 38.7 MJ/m³.	24 2.512 m³/h 30 3.135 m³/h 35 3.657 m³/h
Flue integrity More infoHide info At the air inlet test point, boiler at maximum rate, after readings stabilise (commissioning flowchart).	O₂ ≥ 20.6% or CO₂ ≤ 0.2%

From UIN 223483 A03 (July 2020)

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
Atlantic Combi 24	47-349-81	NG
Atlantic Combi 30	47-349-82	NG
Atlantic Combi 35	47-349-83	NG

Source: Atlantic combination boilers installation & servicing instructions, UIN 223483 A03 (July 2020).

Sections: 1.8 Gas supply; Table 1 General data; Tables 2 & 3 Performance data; 2.23 Commissioning and testing; 2.24 Initial lighting; 2.25 General checks; 3.1 Servicing; 6 Flue & integrity checks (flowchart and setting to maximum/minimum rate).

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.