A.O. Smith BTI 85 G, BTI 100 G User Manual

MODELS

BTI 85 G BTI 100 G

INSTALLATION AND USER

INSTRUCTION

UNITED KINGDOM / IRELAND

HOT WATER STORAGE HEATERS

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 commisioning 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 UNAUTHORISED ALTERATIONS, PRODUCT MODIFICATIONS OR REPAIR.

CONTENTS PAGE

1. GENERAL

1.1 Description...................................................................................................... 4

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

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

1.2.2 Control panel................................................................................................... 6

1.2.3 Operation of the storage water heater ........................................................... 7

1.2.4 Combustion products discharge safety device ............................................. 7

1.3 Technical information ...................................................................................... 8

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

1.3.2 Technical data ............................................................................................... 10

2. FOR THE INSTALLER

2.1 Installation instructions.................................................................................. 12

2.1.1 Installation ..................................................................................................... 12

2.1.2 Water circulation system .............................................................................. 13

2.1.3 Gas connection ............................................................................................. 15

2.1.4 Flue system .................................................................................................. 15

2.1.5 Flue down draught safety device ................................................................. 15

2.1.6 Electrical connection ..................................................................................... 15

2.2 Commissioning .............................................................................................. 16

2.2.1 Filling the water heater ................................................................................. 16

2.2.2 Putting in to operation.................................................................................... 16

2.2.3 Shut down .................................................................................................... 16

2.3 Removing and replacing the control panel front cover.................................. 17

2.4 Setting the gas pressure .............................................................................. 17

2.5 Removing and replacing the inner door......................................................... 18

2.6 Temperature regulation ................................................................................. 18

2.7 Converting to another type of gas ................................................................ 19

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

2.8.1 Magenesium anode ....................................................................................... 19

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

2.8.3 Decalcification...............................................................................................20

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

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

2.10 Gas smell ...................................................................................................... 20

2.11 Condensation................................................................................................ 20

3. FOR THE USER

3.1 Commisioning ................................................................................................ 21

3.1.1 Filling the water heater ................................................................................. 21

3.1.2 Putting into operation..................................................................................... 21

3.1.3 Use ............................................................................................................... 21

3.2 Fault overview ..............................................................................................22

4. WARRANTY..................................................................................................... 23

5. Appendix 1..................................................................................................... 25

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 (EN89). 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, a Thermal Reflux Safeguard (TRS) (category B

). The water heater is suitable for a

11BS

maximum working pressure of 8 bar. The water heater tank is manufactured from low carbon sheet steel and is glasslined on the inside. In addition the tank is fitted with a magenesium anode as extra protection against corrosion. A thick, CFC-free, 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. As hot water is drained from the tank, cold water is added immediately. Four flue baffles have been placed in the flue tube to improve heat tranfer. The flue gasses pass their heat on to the water by means of radiation and convection. The exhaust of the flue gasses is realized by natural thermal draught (see figur 1).

exceeding 25 mm. maximum length of dead leg 3 metres.

Dead legs on a hot water installation are undesireable. Where possible they should be avoided. When the inclusion on the system of a dead leg is unavoidable the following restrictions should be applied:

- for pipes not eceeding 19 mm. inside

diameter; maximum length of dead leg permitted 12 metres;

- for pipes exceeding19 mm. but not

exceeding 25 mm. inside diameter; maximum lenght of dead leg 7,5 metres;

- for pipes with an inside diameter

Figur 1 - Cross section of the heater

1) Draught diverter

2) Hot water outlet

3) Insulation

4) Flue tube

5) Glass lined tank

6) Gas valve and spark ignition

7) Control panel

8) Inspection cover plate

9) Intermittent pilot burner and flame probe

10) Cold water inlet

11) Combustion products discharge safety device

12) T&P valve connection

13) Outer casting

14) Flue baffle

15) Magnesium anode

16) Drain valve and secondary return connection

17) Main burner

1.2 Technical safety equipment

1.2.1 Gas control valve

The water heater is equipped with a gas control wich regulates the flow of gas to the burner. The gas block is equipped with a safety valve, gas valve and burner control (on a standard natural gas setting). To ensure improved ignition the gas control valve opening mechanism is fitted with a delay (softlite). The gas control block is suitable for gasses from the first, second and third gas family. The maximum inlet pressure is 60 mbar.

The automatic incandescent ignition (hot surface) ensures that the burner ignites as soon as there is a demand for heat.

1.2.2 Control panel

Temperature control for the water heater is housed in the control panel (See figur 2). For safety purposes, heaters are always fitted with two thermostats: a control thermostat is adjustable between 40 °C and 80 °C and a safety thermostat 90 °C. The control panel is fitted with an ON/OFF switch (I/0). At setting ”I”, the gas control is activated on the basis of heat demand from the control thermostat. At setting ”0” the heater is switched off.

Figur 2 - Top view of the heater

A) Hot water outlet B) Cold water inlet

1) Electrical connection

2) ON/OFF switch

3) Ignition controller reset button

4) Control thermostat knob

5) Safety thermostat reset button

1.2.3 Operation of the storage water heater.

Normal operation

When there is a demand for heat a waiting period of about 1 second elapses before the built-in spark generator and pilot gas valve are switched on. The ignition sparks ignite the pilot burner and the resulting flame is detected by the ionisation electrode. Almost immediately after the pilot flame is detected, sparking stops and the main gas valve is openend. The main burner is lit by the pilot flame. The unit is now in operation. When the temperature of the water in the unit reaches the temperature that is set with the thermostat, the thermostat switches and disconnects the electrical heat demand signal to the burner controller. The gas valves are then closed.

Ignition failure

If the flame is not established within the safety period the automatic ignition controller locks out. The safety period is about 25 seconds. Lock-out is indicated by the lamp in the RESETbutton on the control panel. The unit has to be manually reset by pushing the reset button. If the flame is lost during normal run, the automatic ignition controller repeats the start sequence.

operation by pressing its reset button. If this failure occurs frequently, this indicates that the flue suffers from down draught conditions. It is recommended that a competent person carry out the necessary remedial action.

Important The combustion products discharge safety device should never be put out of operation. Reentry of flue gases to the building could be harmful and cause poisoning or death.

1.2.4 Combustion products discharge safety device

The heater has been fitted with a combustion products discharge safety device. It is the function of the safety device to prevent flue gases from the water heater entering the room where the water heater has been placed, instead of passing through the flue to outside atmosphere. The gas supply is disconnected as soon as the device is activated by hot gases flowing over the sensor. After the cause of the reentry of flue gases has been traced the device can be put back into

1.3 Technical information

1.3.1 Dimensions

These water heaters are only suitable for a flue tube with minimal the announced diameter (dimension G).

Dimensions BTI 85 BTI 100

A 1585 1780 B 1450 1640 D 645 675

F 770 775 G 130 130 K 340 340

L 355 370 M 1505 1685 N 1505 1685

P 210 210 R 285 285 S 1280 1460 V 410 410

1 Cold water inlet 2 Hot water outlet 3 Gas control 4 Drain valve 5 T&P relief valve tapping 6 Clean out

All dimensions are given in mm. (rounded off on 5mm). See figur 3.

Figur 3 - Dimensions

AOS 1092

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