A.O. Smith EQ 280 G manual

WATERSTORAGE HEATERS UNITED KINGDOM / IRELAND MODELS EQ 280 G EQ 380 G INST ALLA TION- AND USER INSTRUCTION[...]

2 Read these installation instructions first before installing the appliance. Carefully read the user instructions before igniting the appliance. Failure to follow these instructions may lead to risk of explosion and/or fire and could cause material damage and/or bodily harm. Installation and commissioning should be carried out by a qualified compe[...]

3 CONTENTS PAGE 1. General . ......................................................................................................... 4 1.1 - Description of the appliance .......................................................................... 4 1.2 - Technical safety equipment ....................................................................[...]

4 1. GENERAL 1.1 Description of the appliance Construction of the water heater is in accordance with the European standard for gas heated water storage heaters for sanitary application (EN 89). The appliance thus meets the European Directory for Gas Appliances and is therefore entitled to carry the CE- marking. It is an open flued appliance without[...]

5 1) Draught diverter 2) Hot water outlet 3) Insulation material 4) Flue tube 5) Glass lined tank 6) Gas control valve 7) 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 Drawing 1 - Cross-section of the appliance[...]

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 si[...]

7 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. Aft[...]

8 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). All dimensions are given in mm. (rounded off on 5 mm). Dim. EQ 280 EQ 380 (zie fig.3) 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[...]

9 Drawing 3 - Dimensions[...]

10 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) * m 3 /h 2.4 2.5 Diameter main orifice (G20) mm 3.90 4.50 Diameter pilot o[...]

11 DESCRIPTION unit EQ 280 EQ 380 GENERAL Storage capacity litres 265 355 Water connections ** - 1" - 14 NPT 1 1 / 4 " - 14 NPT Gas connection - ISO 7 / 1 Rp 1 / 2 ISO 7 / 1 Rp 1 / 2 Drain tap - 3 / 4 " - 14 NPT 3 / 4 " - 14 NPT Anode - 3 / 4 " - 14 NPT 3 / 4 " - 14 NPT T&P-plug - 3 / 4 " - 14 NPT 3 / 4 "[...]

12 2. FOR THE INSTALLER 2.1 Installation instructions This water heater must be fitted in a location which will permit the provision of an approved flue system and adequate ventilation. A service clearance of 15 cm at the sides and rear of the unit and 60 cm at the front of the unit should be allowed for ease of servicing. Adequate distance must be[...]

13 the current building regulations should be used. Installation should be carried out generally as shown on the following diagram. See drawing 4. A.O. Smith water heaters are tested to a maximum pressure of 12 bar and a maximum working pressure of 8 bar. 1) Gas cock 2) Stop valve 3) Expansion vessel 4) T&P safety valve 5) Non return valve 6) C[...]

14 All connections and joints should be tested for gas soundness with a suitable leak detector (do not use a naked flame). 2.1.4. Flue system The water heater should be fitted with a flue system connected to the draught diverter. The flue pipe should rise for at least 50 cm. vertically before the inclusion of any bends. If a horizon- tal run of flu[...]

15 2.2 Commissioning Filling the water heater 1. Close the drain tap. 2. Open the cold water tap to the water heater and open all taps where hot water can be drained for de- aeration. The water heater is filled as soon as cold water flows from all taps. 3. Close all hot water taps. Putting into operation 1. Check whether the water-heater has been f[...]

16 2.3 Pilot adjustment The pilot can be adjusted by means of the regulating screw under the plastic cover on the right hand side of the gas control block. Turn the screw clockwise to reduce the gas pressure and anti clockwise to increase the pressure. Care should be taken to ensure the pilot covers the thermocouple element correctly. 2.4 Putting o[...]

17 2.6 Setting the nominal heat input The gas control has been factory preset to the water heater nominal heat input. A further check of the burner pressure should be carried out during the commissioning of the unit after installation. The following procedure should be followed. 1. Remove the protruding cover screw on the right side of the gas cont[...]

18 Unit EQ 280 EQ 380 G20 G30 G31 G20 G30 G31 Inletpressure mbar 20 30 37 20 30 37 Burner pressure mbar 12.5 30 37 8.7 30 37 Diameter main mm 3.90 2.30 2.25 4.50 2.35 2.35 injector Diameter pilot 2x 2x 2x 2x 2x 2x injector mm 0.27 0.16 0.16 0.27 0.16 0.16 Conversion from LP-gas to natural gas : - Put the pressure regulator into operation. To do thi[...]

19 2.8 Maintenance To ensure safe and efficient operation of the water heater it is recommended that it is cleaned and serviced at least once a year by a qualified competent person. 2.8.1 Sacrificial anode The life cycle of the anode is determined by the quality and the quantity of the water flowing through the apparatus. It is therefore recommende[...]

20 2.8.3 Decalcification Formation of lime scale depends on the quality and quantity of the water used. In addition higher water temperatures lead to more deposit in the appliance. A temperature setting of 60°C is recommended in order to keep the calcification at a low level. Decalcification should be attempted with the proper means. For extensive[...]

21 Flue down draught safety device If the flue tube safety device has switched off the appliance, the appliance can be put back into operation through the normal procedure. If the flue tube safety device repeatedly puts the appliance out of operation then this points to problems with the flue. The only remedy is to determine the cause of the proble[...]

22 3. FOR THE USER 3.1 Commissioning Warning Installing and commissioning of this water heater should only be carried out by a qualified competent heating engineer. Filling the water heater 1. Close the drain tap. 2. Open the cold water tap to the water heater and open all taps where hot water can be drained for de- aeration. The water heater is fi[...]

23 Failure Cause Measure 3.4 Fault finding Blocked pilot burner Blocked chimney Safety thermostat Thermocouple defective Thermocouple makes no contact Gas supply closed Temperature is set too low Control knob in position ( ✸ ) (pilot burns ) Control knob in position ( l ) Flue safety device closed the gas supply Gas supply closed Safety thermosta[...]

24 4. GUARANTEE The following conditions form the guarantee agreement between A.O. Smith Water Products Company (the warrantor) and the owner of the water heater. 4.1 Guarantee in general If within one year of the original installation date of the water heater any part or component other than the tank shall prove upon examination by the warrantor o[...]

25 4.7 No other guarantee or warrant y either expressed or implied is made on behalf of A.O. Smith Water Products Company. With respect to the water heater in question further A.O. Smith does not guarantee this water heater as suitable for purpose except within the terms of warranty detailed above. A.O. Smith Water Products Company will not be liab[...]

26[...]

27 MODEL: ......................................................................................................................... SERIAL NUMBER: ......................................................................................................... ORIGINAL DATE OF INSTALLATION: ..................................................................[...]

0308 645 R0[...]