British Gas RD 532 combi (ZWB 7-32 RD 532)
Combi, natural gas and LPG
Combustion figures
| Figure | Natural gas (G20) | LPG (G31) |
|---|---|---|
CO₂ at high rate More infoHide infoAt max. rated heat output. Same figures in Technical data (1.9, Table 2) and Table 15 (7.1). No tolerance given. Measured at the flue gas testing point (234), probe about 135 mm in. The MI says the CO₂ is factory set and no adjustment is needed when installing a natural gas appliance. | 9.2% | 10.8% |
CO₂ at low rate More infoHide infoAt min. rated heat output. Same figures in Technical data (1.9, Table 2) and Table 15 (7.1). No tolerance given. | 8.8% | 10.5% |
Maximum CO More infoHide infoSection 7.2.2 says to test CO and CO₂ in chimney sweep mode but gives no CO limit. | Not given in MI | Not given in MI |
CO/CO₂ ratio | Not given in MI | Not given in MI |
O₂ | Not given in MI | Not given in MI |
Working inlet pressure More infoHide infoThe MI says the appliance must not be operated outside these figures. It calls the point the testing point for gas supply pressure (fig. 2, item 7, shown on the gas valve). For LPG, section 5.1 says 37 mbar at the inlet to the appliance and section 7 says below or above 37 mbar at the testing point; no tolerance is given. Technical data gives a gas supply pressure of NG 20 mbar, LPG 37 mbar without saying where. |
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Gas rate at maximum More infoHide infoMaximum gas flow rate after 10 minutes from lighting. NG G20 (CVnet 34.02 MJ/m³), LPG (CVnet 88 MJ/m³). | 3.4 m³/h | 2.3 kg/h |
Flue integrity More infoHide infoAt the combustion air testing point (234.1), probe about 80 mm in, in chimney sweep mode. MI wording: O₂ must not be less than 20.6%, CO₂ must not exceed 0.2%. For type C13 or C33 flue systems. | O₂ ≥ 20.6% CO₂ ≤ 0.2% | O₂ ≥ 20.6% CO₂ ≤ 0.2% |
From 6 720 611 451 GB (03.11)
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 |
|---|---|---|
| ZWB 7-32 RD 532 | 41-108-13 | Not stated |
Source: RD 532 combi Installation and Servicing Instructions, 6 720 611 451 GB (03.11).
Sections: 1.6 Layout of appliance; 1.9 Technical data; 5.1 Commissioning; 6.3 Setting the gas/air ratio; 7 Converting the appliance to different gas types (Checking the gas supply pressure); 7.1 Setting the gas/air ratio; 7.2.1 Testing the O2 or CO2 level in the combustion air; 7.2.2 Testing CO and CO2.
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.