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Hersteller: Bradford-White Corp Dateigröße: 498.31 kb Dateiname: Unterrichtssprache:

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. but not exceeding 25 mm. inside diameter; maximum length of dead leg 7.5 metres; -for pipes with an inside diameter exceeding 25 mm. maximum dead leg 3.0 metres. Drawing 1 - Cross-section of the appliance 1) 2) 3) 4) 5) 6) 7) Draught diverter Hot water outlet Insulation material Flue tube Glass lined tank Gas control valve Cold water inlet pipe 8) T&P safety connection 9) Steel jacket 10) Flue baffle 11) Sacrificial anode 12) Drain tap 13) Atmospheric burner 14) Pilot light burner with thermocouple 6 1.2 Technical safety equipment Gas control block The water heater has been fitted with a gas control block consisting of a thermo-electrical pilot flame safeguard, pilot flame pressure regulator, burner pressure regulator, a control thermostat (adjustable between 30°C and 71°C) and a safety thermostat (82°C). This gas control block with its simple and secure control respectively switches the gas supply to the main burner on or off. This gas control block is suitable for gasses from the first, second and third gas family. The maximum inlet pressure is 50 mbar. Thermal Reflux Safeguard The heater is fitted with a flue gas blowback safety device. The functioning of the safety device is based upon the principle of the Thermal Reflux Safeguard – TRS for short – shown in Fig.2. This TRS can be recognized by the copper coloured spiral that is fitted to the lower edge of the draught diverter. The spiral is connected to a thermostat by means of a capillary tube. The wiring of the thermostat must be connected to the thermocouple circuit. Drawing 2 - Gas control block with T.R.S. 1) T.R.S. thermostat 2) Sensor T.R.S. thermostat 3) Thermocouple with built-in interrupter 4) Thermocouple 5) Gas control block 6) Reset button 7) Pilot burner 8) Temperature regulator knob It is the aim of the T.R.S. to prevent flue gasses from the water heater entering the room where the water heater has been placed, instead of passing through the flue to outside atmosphere. The thermo-couple circuit is interrupted and the gas supply is disconnected as soon as the T.R.S. is activated by heating of the sensor by the hot gasses. After the cause of the reentry of flue gasses has been traced the device can be put back into operation again. In case of T.R.S. the RESET button has to be pressed first. If this failure occurs frequently, this indicates that the flue suffers from down draught conditions. We advice that necessary remedial actions be carried out by a competent person. Important If the water heater is put out of operation by a failure, this may be caused by the T.R.S.. If there is a RESET button on the thermostat this is visible because the button rose. The device can be put back into operation by pressing the RESET-button. The T.R.S. should never be put out of operation. Reentry of flue gasses to the building could be harmful and cause poisoning or death. Attention: Instruction addition for installer. Fitting the Thermal Reflux Safeguard: 1. Remove the two screws from the lid; 2. Position the support (with pre- assembled TRS) onto the lid; 3. Secure the support, using both screws; 4. Interconnect the male and female connectors on the lid. 1.3 Technical description 1.3.1 Dimensions These water heaters are only suitable for a flue tube with minimal the announced diameter (dimension G). Dim. (zie fig.3) EQ 280 EQ 380 A 1585 1780 B 1450 1640 D 645 675 F 730 765 G 130 130 K 390 390 L 375 385 M 1505 1685 N 1505 1685 R 285 275 S 1280 1460 V 410 410 1 Cold water inlet 2 Warm water outlet 3 Gas control block 4 Drain tap 5 T&P relief valve tapping All dimensions are given in mm. (rounded off on 5 mm). Drawing 3 - Dimensions 1.3.2 Technical data Device category: II2H3+ DESCRIPTION unit EQ 280 EQ 380 DATA NATURAL GAS G20 - 20 mbar: Nominal heat input (lower value) k W 22.6 24.0 Nominal power k W 19.2 20.4 Inlet-pressure (G20) mbar 20 20 Burner pressure (G20) mbar 12.5 8.7 Gas consumption (G20) * m3/h 2.4 2.5 Diameter main orifice (G20) mm 3.90 4.50 Diameter pilot orifice (G20) mm 2 X 0,27 2 X 0,27 Warming-up time DT= 45 K min. 56 61 DATA BUTANE G30 - 30 mbar: Nominal heat input (lower value) k W 22.6 24.0 Nominal power k W -- Inlet-pressure (G30) mbar 30 30 Burner pressure (G30) mbar 30 30 Gas consumption (G30) * kg/h 1.8 1.9 Diameter main orifice (G30) mm 2.30 2.35 Diameter pilot orifice (G30) mm 2 x 0.16 2 x 0.16 Warming-up time DT= 45 K min. -- DATA PROPANE G31 - 37 mbar Nominal heat input (lower value) k W 21.1 22.9 Nominal power k W -- Inlet-pressure (G31) mbar 37 37 Burner pressure (G31) mbar 37 37 Gas consumption (G31) * kg/h 1.6 1.8 Diameter main orifice (G31) mm 2.25 2.35 Diameter pilot orifice (G31) mm 2 x 0.16 2 x 0....

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