A.O. Smith EQ 115 G, EQ 155 G, EQH 200 G User Manual

MODELS

EQ 115 G EQ 155 G EQH 200 G

INSTALLATION- AND USER

INSTRUCTIONS

HOT WATER STORAGE HEATERS

UNITED KINGDOM / IRELAND

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 competent installer. The type of gas and the value at which the appliance is set standard in the factory are registered on the rating plate. The appliance may only be installed in a room if this room meets the ventilation requirements.

A.O. SMITH ACCEPTS NO RESPONSIBILITY FOR WARRANTY, SERVICE AND/OR PRODUCT LIABILITY IN CASE OF UNAUTHORIZED ALTERATIONS, PRODUCT MODIFICATIONS OR REPAIR.

CONTENTS PAGE

1. General............................................................................................................4

1.1 Description of the appliance ............................................................................4

1.2 Technical safety equipment ............................................................................6

1.2.1 Gas control valve............................................................................................6

1.2.2 Flue down draught safety device ...................................................................6

1.3 Technical description ......................................................................................8

1.3.1 Dimensions......................................................................................................8

1.4 Technical data...............................................................................................10

2. For the installer.............................................................................................11

2.1 Installation instructions ....................................................................................11

2.1.1 Installation........................................................................................................11

2.1.2 Water connections .......................................................................................... 11

2.1.3 Gas connection ...............................................................................................13

2.1.4 Flue system .....................................................................................................13

2.1.5 Flue down draught safety device ....................................................................13

2.2 Commissioning .................................................................................................14

2.2.1 Filling the water heater ....................................................................................14

2.2.2 Putting into operation ....................................................................................... 14

2.2.3 Removing and replacing the inner door ...........................................................15

2.3 Pilot adjustment ................................................................................................15

2.4 Putting out of operation....................................................................................15

2.5 Temperature regulation....................................................................................16

2.6 Setting the nominal heat input ..........................................................................17

2.7 Conversion to another type of gas ..................................................................17

2.8 Maintenance ....................................................................................................19

2.8.1 Sacrificial anode ..............................................................................................19

2.8.2 Cleaning...........................................................................................................20

2.8.3 Inspection of the internal waterside surfaces ................................................. 20

2.8.4 Spare parts .....................................................................................................20

2.9 Inlet combination ..............................................................................................20

2.10 Fault finding .....................................................................................................21

2.10.1 Safety thermostat ............................................................................................ 21

2.10.2 Flue down draught safety device ....................................................................21

2.10.3 Hot water temperature too low .......................................................................21

2.10.4 Hot water temperature too high.......................................................................21

2.10.5 Possible water leakage ...................................................................................21

2.11 Gas smell.........................................................................................................21

2.12 Condensation ..................................................................................................21

3. For the user. ..................................................................................................22

3.1 Commissioning .................................................................................................22

3.1.1 Filling the water heater ....................................................................................22

3.1.2 Putting into operation ....................................................................................... 22

3.1.3 Use ..................................................................................................................22

3.1.4 Putting out of operation....................................................................................22

3.1.5 Maintenance ....................................................................................................23

3.2 Fault finding .....................................................................................................24

4. Guarantee. .....................................................................................................26

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 CEmarking. It is an open flued appliance without ventilator and with a flue gas down draught safeguard (category B11BS). The water heater is suitable for a maximum working pressure of 8 bar. The water-heater tank is manufactured from low carbon sheet steel and is glass-lined on the inside. In addition the tank is fitted with a sacrificial anode as an extra protection against corrosion.

A thick PU-insulation layer covered in a steel jacket reduces unnecessary heat loss. When the appliance is filled with water it continuously is under water pressure.

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.

As hot water is drained from the tank, cold water is added immediately. A flue baffle has been placed in the flue tube to improve heat transfer. The flue gasses pass their heat on to the water by means of radiation and convection. The flue gasses are guided to the chimney via the draught diverter. The exhaust of the flue gasses is realized by natural thermal draught (see Figure

1).

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

Figure 1 - Cross-section of the heater

AOS 0478

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

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 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.

1.2.2 Flue down draught safety

device

The appliance must be fitted with a flue down draught safety device. The operation of the safeguard is based on the principle of the Thermal Reflux Safeguard (T.R.S.). The appliance has been fitted with a T.R.S., see Figure 2. This T.R.S. can be recognized by the brass colored helix coil which is connected to the lower edge of the draught diverter. The helix coil has been connected to the thermostat by means of a capillary tube. The wiring that is connected to the thermostat must be connected to the thermocouple.

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 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.

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.

Figure 2 - Gas control block with T.R.S.

AOS 0479

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

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 205 205 205

1 Cold water inlet 2 Hot water outlet 3 Gas control valve 4 Drain valve 5 T&P valve tapping

All dimensions are given in mm (rounded off on 5 mm).

Figure 3 - Dimensions

AOS 0481

1.4 Technical data

Device category: II2H3+

DESCRIPTION unit EQ 115 EQ 155 EQH 200

DATA NATURAL GAS G20 - 20 mbar:

Nominal load (gross) k W 9.3 11.3 18.3 Nominal capacity k W 7.4 9.0 14.0 Suppy pressure mbar 20 20 20 Burner pressure mbar 12.5 12.5 10.5 Gas consumption * m3/h 0.9 1.1 1.7 Diameter main orifice mm 2.35 2.60 3.50 Diameter pilot orifice mm 2 x 0.27 2 x 0.27 2 x 0.27 Heating time ∆T= 44 K min. 45 49 40

DATA BUTANE G30 - 28/30 mbar:

Nominal load (gross) k W 10.1 12.2 17.6 Supply pressure mbar 30 30 30 Burner pressure mbar 30 30 30 Gas consumption * kg/h 0.7 0.9 1.3 Diameter main orifice mm 1.40 1.50 1.95 Diameter pilot orifice mm 0.22 0.22 0.22

DATA PROPANE G31 - 37 mbar:

Nominal load (gross) k W 9.8 11.8 17.2 Supply pressure mbar 37 37 37 Burner pressure mbar 37 37 37 Gas consumption * kg/h 0.7 0.8 1.3 Diameter main orifice mm 1.40 1.50 1.95 Diameter pilot orifice mm 0.22 0.22 0.22

GENERAL

Storage capacity litres 109 144 181 Water connections ** Gas connection - ISO 7/1 Rp 1/ Drain valve Anode T&P-plug -

/4" - 14 NPT

Maximum operating pressure bar 8 8 8 Empty weight kg 47 52 75

* Gas consumption at 1013,25 mbar and 15°C ** For a leak-proof sealed connection European coupling pieces can be used on the NPT-connection nipples with a pipe thread

of ISO 228/1

/4" - 14 NPT

ISO 7/1 Rp 1/

/4" - 14 NPT

ISO 7/1 Rp 1/

/4" - 14 NPT

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