A.O. Smith EQ 280 G - Manual

Page 4 - Description of the appliance; Construction of the water heater is

4 1. GENERAL 1.1 Description of the appliance Construction of the water heater is in accordance with the Europeanstandard for gas heated water storageheaters for sanitary application (EN 89).The appliance thus meets the EuropeanDirectory for Gas Appliances and istherefore entitled to carry the CE-ma...

Page 6 - Technical safety equipment; Gas control block; The water heater has been fitted; Thermal Reflux Safeguard; The heater is fitted with a flue gas

6 1.2 Technical safety equipment Gas control block The water heater has been fitted with a gas control block consisting of athermo-electrical pilot flame safeguard,pilot flame pressure regulator, burnerpressure regulator, a control thermostat(adjustable between 30°C and 71°C)and a safety thermostat ...

Page 7 - I m p o r t a n t

7 It is the aim of the T.R.S. to prevent flue gasses from the water heaterentering the room where the waterheater has been placed, instead ofpassing through the flue to outsideatmosphere. The thermo-couple circuitis interrupted and the gas supply isdisconnected as soon as the T.R.S. isactivated by h...

Page 8 - Technical description; D i m e n s i o n s

8 1.3 Technical description 1.3.1 D i m e n s i o n s These water heaters are only suitable for a flue tube with minimal theannounced 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 ...

Page 9 - Drawing 3 - Dimensions

Page 12 - Installation instructions; not

12 2. FOR THE INSTALLER 2.1 Installation instructions This water heater must be fitted in a location which will permit the provisionof an approved flue system andadequate ventilation. A service clearance of 15 cm at thesides and rear of the unit and 60 cm atthe front of the unit should be allowedfor...

Page 14 - Draught diverter; Important

14 All connections and joints should be tested for gas soundness with asuitable leak detector (do not use anaked flame). 2.1.4. Flue system The water heater should be fitted with a flue system connected to thedraught diverter. The flue pipe shouldrise for at least 50 cm. vertically beforethe inclusi...

Page 15 - Commissioning; Filling the water heater

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 hotwater can be drained for de-aeration. The water heater is filledas soon as cold water flows from alltaps. 3. Close all hot water taps. Putting into operation...

Page 18 - Unit; ‘no pr’

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 2 x 2 x 2 x 2 x 2 x 2 x injector mm 0.27 0.16 0.16 0.27 0.16 0.16 Conversion from LP-gas to naturalg a s...

Page 19 - Maintenance; Sacrificial anode

19 2.8 Maintenance To ensure safe and efficient operation of the water heater it isrecommended that it is cleaned andserviced at least once a year by aqualified competent person. 2.8.1 Sacrificial anode The life cycle of the anode is determined by the quality and thequantity of the water flowing thr...

Page 20 - Decalcification; Formation of lime scale depends on; Spare parts; To be able to order spare parts it is; Inlet combination; In case of failure the following; Safety thermostat; All appliances have been fitted with

20 2.8.3 Decalcification Formation of lime scale depends on the quality and quantity of the waterused. In addition higher watertemperatures lead to more deposit in theappliance. A temperature setting of60°C is recommended in order to keepthe calcification at a low level.Decalcification should be att...

Page 21 - IMPORTANT WARNING

21 Flue down draught safety device If the flue tube safety device has switched off the appliance, theappliance can be put back into operationthrough the normal procedure. If the fluetube safety device repeatedly puts theappliance out of operation then thispoints to problems with the flue. Theonly re...

Page 22 - FOR THE USER; Warning; Use

22 3. FOR THE USER 3.1 Commissioning Warning Installing and commissioning of thiswater heater should only be carried outby a qualified competent heatingengineer. Filling the water heater 1. Close the drain tap.2. Open the cold water tap to the water heater and open all taps where hotwater can be dra...

Page 23 - Fault finding

23 Failure C a u s e M e a s u r e 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 devic...

A.O. Smith EQ 280 G - Manual

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Summary

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