Assessments - 5, GPA: 3.6
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1.2.4 Air proving switch The air proving switch ensures that there is sufficient air flow for the safe operation of the water heater. If the airflow falls below the preset value this will be detected by the air proving switch and the gas supply to both the ignition and main burners will be closed. The air proving switch is preset and cannot be adjusted. Air proving switches BFM-units Unit Pstart Poff (Pa) (Pa) BFM 30 250 220 BFM 50 250 220 BFM 80 230 205 The air proving switch must always be fitted with the connection points downwards! The air pressure differential switch must always be fitted with the connection points at the bottom, while the pipe with the letter H must be connected to the point P1. Pipe L goes to connection P2. 1.2.5 Gas control The water heaters are provided with a gas valve that regulates the gas supply to the burners. The gas control has a safety valve and a gas valve and hence has a B/D-configuration. The position of both valves can be regulated by the burner automation. To ensure improved ignition the gas control valve opening mechanism is fitted with a delay (softlite). Figure 2 - Positioning ventilation Figure 3 - Differential pressure switch 1.3 Technical description 1.3.1 Measurements See figure 4 Size BFM 30 BFM 50 BFM 80 A 1995 1995 2020 B 1795 1795 1820 C 600 600 600 D 520 520 525 E 600 600 590 F 1640 1640 1655 G 1360 1360 1360 H 630 630 625 K 710 710 710 L 1000 1000 1000 M 755 755 755 N 80/125 100/150 130/200 1 Cold water inletRP1. 2 Hot water outletRP 1. 3 Gas valve RP . 4 Drain valve ."-14 NPT 5 T&P-connection (temperature- and pressure valve) 1"-14 NPT All dimensions in mm, rounded up to the nearest 5 mm. IMD-0057-R0 Figure 4 1.3.2 Technical data Heater category:II 2H3+ Description Unit BFM 30 BFM 50 BFM 80 DATA NATURAL GAS G 20 Nominal gas inlet pressure mbar 20 20 20 Burner pressure mbar 12.5 12.5 12.5 Input kW 29 47 75 Output to water kW 27 42 68 Gas consumption* m3/h 3.0 4.7 7.9 Diameter main injector m m 2.60 2.50 2.70 Diameter injector ignition burner m m 0.56 / 0.41 0.56 / 0.41 0.56 / 0.41 Heating time DT=45°C min 35 25 12 DATA PROPANE/BUTANE G 30 - G 31 G30 G31 G30 G31 G30 G31 Nominal gas inlet pressure mbar 30 37 30 37 30 37 Input kW 29 28 46 44 75 71 Gas consumption kg/h 2.3 2.1 3.6 3.3 5.8 5.3 Diameter main injector m m 1.45 1.40 1.50 Diameter injector ignition burner m m 0.25 0.25 0.25 GENERAL Storage capacity litre 309 298 253 Number of bar burners -3 5 7 Number of anodes -2 2 4 Number of flue tubes -5 7 16 Water connections -Rp11/2 Rp11/2 Rp11/2 Gas connection -Rp3/4 Rp3/4 Rp3/4 Drain connection -3/4" - 14 NPT 3/4" - 14 NPT 3/4" - 14 NPT Anode -3/4" - 14 NPT 3/4" - 14 NPT 3/4" - 14 NPT Connection T&P-plug** -1” - 14 NPT 1” - 14 NPT 1” - 14 NPT Maximum working heat bar 8 8 8 Empty weight kg 270 290 350 * Gas usage at 1013,25 mbar and 15 °C. ** For a leak-tight connection European coupling pieces with pipe screw-thread according to ISO 228/1 or ISO 7/1 can be used on the NPT-connection nipples. 2. FOR THE INSTALLER If possible, use a trolley or fork-lift truck to move the water heater. Always move the water heater in an upright position. 2.1 Installation instructions The following distances should be observed: -Sides of the water heater: (free space for the accessibility of the hand holes) -Rear of the water heater: -Around top-box and concentric pipe: -Front of the water heater: (free space to take out bar burners) 100 cm 15 cm 15 cm 100 cm 2.1.1 Installation Installation should be carried out in accordance with all local authority and building regulations, local water authority and fire regulations and the following British standards: British Gas Publication UP1 and UP2. BS 5482 part 1 1979 part 2 1979 part 3 1979 BS 6644 BS 6700 BS 6798 IMD-0065 2.1.2 Water connections A.O. Smith water heaters are suitable for connection to vented, unvented and pumped pressurised systems. In each case appropriate valves and fittings should be used to ensure the system complies with the requirements of the water by laws, and appropriate building regulations. When fitting it is essential the rules of 'good practice' are applied at all stages of installation. Vented systems If the water heater is to be connected to a cold feed tank or cistern the hot water supply pipe must include an open vent which discharges over the cold feed cistern. The cold feed cistern must have an actual capacity of greater volume than the hourly recovery rate of the water heater(s) which it supplies.The minimum actual capacity is 50 gallons or 227 litres. See diagram 5. A.O. Smith water heaters are tested to a maximum pressure of 12 bar and a maximum working pressure of 8 bar. Dead legs on a hot water installation are undesireable. Where possible they should be avoided. Where the inclusion on the system of a dead leg is unavoidable the following restrictions should be applied: -for pipes not exceeding 19 mm. inside diameter; maximum lengh of dead leg permitted 12.0 metres; -for pipes exceeding 19 mm. ...
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