A.O. Smith EQ 155 G manual

INST ALLA TION- AND USER INSTRUCTIONS HOT WATER STORAGE HEATERS UNITED KINGDOM / IRELAND MODELS EQ 115 G EQ 155 G EQH 200 G[...]

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 Figure 1 - Cross-section of the heater 1) Draught diverter 2) Hot water outlet 3) Insulation 4) Flue tube 5) Glass lined tank 6) Gas control valve 7) Cold-water inlet 8) T&P valve connection 9) Outer casting 10) Flue baffle 11) Sacrificial anode 12) Drain valve 13) Atmospheric burner 14) Pilot light burner with thermocouple AOS 0478[...]

6 1.2 Technical safety equipment 1.2.1 Gas control valve 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 [...]

7 Figure 2 - Gas control block with T.R.S. 1) T.R.S. thermostat 2) Sensor combustion products dicharge safety device 3) Thermocouple with built-in interrupter 4) Thermocouple 5) Gas control block 6) Reset button 7) Pilot burner 8) Temperature regulator knob AOS 0479[...]

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). Dimensions EQ 115 EQ 155 EQH 200 A 1280 1370 1670 B 1120 1210 1540 D 465 515 515 F 545 595 605 G 80 80 100 K 325 325 380 L 270 295 395 M 1180 1270 1590 N 1180 1270 1590 R 230 230 255 S 945 1030 1380 V[...]

9 Figure 3 - Dimensions AOS 0481[...]

10 GENERAL Storage capacity litres 1 09 144 181 Water connections ** - 3 / 4 " - 14 NPT 3 / 4 " - 14 NPT 3 / 4 " - 14 NPT Gas connection - ISO 7 / 1 Rp 1 / 2 ISO 7 / 1 Rp 1 / 2 ISO 7 / 1 Rp 1 / 2 Drain valve - 3 / 4 " - 14 NPT 3 / 4 " - 14 NPT 3 / 4 " - 14 NPT Anode - 3 / 4 " - 14 NPT 3 / 4 " - 14 NPT 3 / 4 &[...]

11 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[...]

12 1) Manual gas valve 2) Stop valve 3) Expansion vessel 4) T&P safety valve 5) Non return valve 6) Circulation pump 7) Drain valve Figure 4 - Connection diagram (unvented system) 8) Pressure limiting valve 9) Expansion valve A) Gas supply B) Hot water delivery C) Cold water inlet D) Hot water taps E) Return circulation See Figure 4. A.O. Smith[...]

13 2.1.3 Gas connection The gas supply to this appliance must be installed in accordance with BS 6891 (1988). Fit the 1/2" gas supply cock supplied with this unit immediately before the gas control block. No heat or soldered joints should be applied in the vicinity of the gas control block, as they could cause damage to the control. All connec[...]

14 2.2 Commissioning 2.2.1 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. 2.2.2 Putting into operation 1. Check whether the water-heate[...]

15 2.2.3 Removing and replacing the inner door (only for the EQ 115/155 models, see Figure 7a). Procedure: 1. Place lip A through the recess on the right and subsequently slide it down behind the steel wall. See to it that both lower lips remain in front of the metal wall. 2. Press lip B through the recess on the left. 3. Subsequently slide lip B b[...]

16 recommended to also close the cold water tap and to drain the appliance after cooling (open the drain tap; it is possible to connect a drain hose to the drain tap; open the nearest hot water drain point to prevent air locks). To be able to drain the appliance completely it should be disconnected and tilted slightly in the direction of the drain [...]

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 G20 G30 G31 Inlet pressure mbar 20 30 37 Burner pressure mbar 10.5 30 37 Diameter main injector mm 3.50 1.95 1.95 Diameter pilot injector mm 2x0.27 0.22 0.22 G20 G30 G31 G20 G30 G31 Inlet pressure mbar 20 30 37 20 30 37 Burner pressure mbar 12.5 30 37 12.5 30 37 Diameter main injector mm 2.35 1.40 1.40 2.60 1.50 1.50 Diameter pilot injector mm 2[...]

19 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 recommended that the anode be inspected and replaced if necessary at least once a year. 1. Close the stop cock in the cold water supply pipe, 2. Open the nearest hot water tap in order to a[...]

20 2.8.2 Cleaning 1. Close the gas supply and demount the burner after it has cooled down, 2. Disconnect the burner, pilot pipe and thermo couple from the gas control block (see Figure 11), 3. Remove the complete burner assembly, 4. Clean the burner with a soft brush. 5. Check the pilot burner and clean it if so required, 6. Check the combustion ch[...]

21 2.10 Fault finding In case of failure the following should be checked. 2.10.1 Safety thermostat All appliances have been fitted with a safety thermostat that shuts off the gas supply when the water temperature is too high. The safety thermostat remains activated until the water temperature drops below the safety temperature. The water heater mus[...]

22 3. FOR THE USER 3.1 Commissioning Warning Installing and commissioning (for the first time) of this water heater should only be carried out by a qualified competent heating engineer. 3.1.1 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- aerat[...]

23 and tilted slightly in the direction of the drain tap. 3.1.5 Maintenance The inlet combination has to be tested regularly by relieving it (via the relief button). The water has to flow out in a forceful jet. Check whether the discharge pipe is open. We recommend a service agreement on an annual basi s. To be able to order spare parts it is impor[...]

Fault Possible cause Corrective action 3.2 Fault finding Blocked pilot burner Blocked chimney Safety thermostat Thermocouple defective Thermocouple makes no contact Gas supply closed Down draught supervision not connected. Temperature is set too low Control knob in position ( ✸ ) (pilot burns ) Control knob in position ( l ) Flue safety device cl[...]

Fault Possible cause Corrective action Insufficient hot water, or none at all Water leakage Set the temperature regulator at a lower temperature and reignite the pilot burner. Reduce the consumption of hot water. Allow the appliance time to heat the water. Turn the control button to the ( l ) position. Close the gas tap and inform your installer. S[...]

26 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[...]

27 any other dealer or stockist of the warrantors products. 4.7 No other guarantee or warranty 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 a[...]

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

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