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- Owner's manual
A.O. Smith BTI 85 Owner Manual
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A.O. Smith BTI 85 is an open flued gas-heated water storage heater suitable for sanitary applications, with a maximum working pressure of 8 bar. It features a glass-lined tank with a magnesium anode for corrosion protection, thick CFC-free PU insulation, and a steel jacket to minimize heat loss. The flue tube contains four baffles to enhance heat transfer, and the exhaust of flue gasses is achieved through natural thermal draught.
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BTI 85
BTI 100
United Kingdom & Ireland
HOT WATER STORAGE HEATERS
Installatie-, Gebruikers- en Servicehandleiding
Installation, User and Service Manual
Installations-, Benutzer- und Wartungs anleitung
Manuel d’installation, Mode d’emploi, Manual d’entretien
Manual de Instalación, Usuario y Servicio
Manual de Instalação, Utilização e Manutenção
Manuale Installazione, d’uso e manutenzione
Instrukcja Serwisu, Obsługi I Montazu
Innovation has a name.
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.
2
CONTENTS PAGE
1. General .................................................................................................................... 4
1.1
1.2
1.3
1.4
Description of the appliance ..................................................................................... 4
Packaging material......................................................................................................... 4
Disposal ......................................................................................................................... 4
Technical safety equipment ...................................................................................... 5
1.4.1 Gas control valve ...................................................................................................... 5
1.4.2 Control panel ............................................................................................................ 5
1.4.3 Operation of the storage water heater ...................................................................... 7
1.4.4 Combustion products discharge safety device ......................................................... 7
1.5 Technical description ................................................................................................ 8
1.5.1 Dimensions ............................................................................................................... 8
1.5.2 Technical data ......................................................................................................... 10
2.
2.1
For the installer ..................................................................................................... 13
Installation instructions ........................................................................................... 13
2.1.1 Installation .............................................................................................................. 13
2.1.2 Water circulation system ......................................................................................... 14
2.1.3 Gas connection ....................................................................................................... 16
2.1.4 Flue system ............................................................................................................ 16
2.1.5 Draught diverter ...................................................................................................... 16
2.1.6 Electrical connection ............................................................................................... 16
2.2 Commissioning ....................................................................................................... 17
2.2.1 Filling the water heater ........................................................................................... 17
2.2.2 Putting into operation .............................................................................................. 17
2.2.3 Shut down ............................................................................................................... 17
2.3
2.4
2.5
2.6
Removing and replacing the control panel front cover ........................................... 18
Setting the gas pressure ......................................................................................... 18
Temperature regulation ........................................................................................... 19
Converting to another type of gas .......................................................................... 19
2.7 Maintenance ........................................................................................................... 19
2.7.1 Magenesium anode ................................................................................................ 19
2.7.2 Cleaning ................................................................................................................. 19
2.7.3 Decalcification ........................................................................................................ 20
2.7.4 Spare parts ............................................................................................................. 20
2.8
2.9
Inlet combination .................................................................................................... 20
Gas smell ................................................................................................................ 20
2.10 Condensation ......................................................................................................... 20
3.
3.1
For the user. .......................................................................................................... 21
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
4.1
4.2
4.3
4.4
4.5
4.6
4.7
Guarantee in general .............................................................................................. 23
Guarantee of the tank ............................................................................................. 23
Conditions for installation and use .......................................................................... 23
Exclusions .............................................................................................................. 23
Range of guarantee ................................................................................................ 23
Claims ..................................................................................................................... 24
No other guarantee or warrantee either expressed or implied is made on behalf of A.O. sMITH Water Products company ...................................... 24
Appendix 1 .............................................................................................................. 25
3
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 (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 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 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).
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 exceeding 25 mm. maximum length of dead leg 3 metres.
1.2 Packaging material
The packaging protects the device against transportation damage.
The selected packaging material is environmentally friendly, recyclable and can be disposed of in a relatively easy and environmentally friendly way.
1.3 Disposal
Old and discarded devices contain substances that are to be recycled.
Please take the local laws with respect to waste processing into account when disposing of old and discarded devices.
Never dispose of your old device through the domestic waste, but bring it to a municipal collection point for electric and electronic equipment. If necessary, ask your dealer/installer for information.
Store the old device outside the reach of children.
1.2 Technical safety equipment
1.2.1 Gas control valve
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
The gas control block is suitable for gasses from the first, second and third
The automatic incandescent ignition (hot surface) ensures that the burner ignites as soon as there is a demand for heat. surface) ensures that the burner ignites as soon as there is a demand for heat.
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.
1129
Figur 2 - Top view of the heater
A) Hot water outlet
Figure 2 - Top view of the heater
1) Electrical connection
A) Hot water outlet
B) Cold water inlet
6
3) Ignition controller reset button
4) Control thermostat knob
5) Safety thermostat reset button
5
3
4
5
1
2
10
11
12
13
14
15
6
7
8
9
Figur 1 - Cross section of the heater
16
17
AOS 1120
1) Draught diverter
2) Hot water outlet
Figure 1 - Cross-section of the heater
5) Glass lined tank
1) Draught diverter
2) Hot water outlet
3) Insulation
4) Flue tube flame probe
5) Glass lined tank
6) Gas valve and spark ignition
7) Control panel
8) Inspection cover plate
9) Intermittent pilot burner and flame probe
6
10) Cold water inlet
11) Combustion products discharge safety device
12) T&P valve connection
13) Outer casting
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
5
1.4.3 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 RESET-button 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.
1.4.4 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 re-entry of flue gases has been traced the device can be put back into 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.
Re-entry of flue gasses to the building could be harmful and cause poisoning or death.
7
1.5 Technical description
1.5.1 Dimensions
These water heaters are only suitable for a flue tube with minimal the announced diameter (dimension G).
Dimensions BTI 85
3
4
1
2
5
6
R
S
M
N
E
G
K
A
B
D
All dimensions are given in mm. (rounded off on 10 mm).
1585
1450
645
770
130
340
1505
1505
285
1280
Cold water inlet
Hot water outlet
Gas control
Drain valve
T&P relief valve tapping
Clean out
BTI 100
1780
1640
675
775
130
340
1685
1685
285
1460
8
Figur 3 - Dimensions
Figure 3 - Dimensions
9 9
1.5.2 Technical data
Device category II
2H3+
DESCRIPTION unit BTI 85 BTI 100
DATA NATURAL GAS G20 - 20 mbar:
Heat input (gross)
Nominal output
Suppy pressure
Burner pressure
Gas consumption*
Diameter main orifice
Diameter pilot orifice
Heating time ΔT= 45 K
Emissions of Nitrogen Oxides (NO
2
)
DATA BUTANE G30 - 30 mbar:
Nominal load (gross)
Nominal output
Suppy pressure
Gas consumption*
Diameter main orifice
Diameter pilot orifice
DATA PROPANE G31 - 37 mbar:
Nominal heat input (gross)
Nominal output
Inlet pressure kW kW mbar mbar m
3
/h mm mm min.
mg/kWh GCV kW kW mbar kg/h mm mm kW kW mbar
25.1
19.2
20
12.0
2.4
3.90
0.56 / 0.41
43
161
24.5
19.2
30
1.8
2.30
0.23
22.9
17.9
37
26.7
20.4
20
7.9
2.5
4.50
0.56 / 0.41
55
193
26.0
20.4
30
1.9
2.35
0.23
24.9
19.5
37
Gas consumption*
Diameter main orifice kg/h mm mm
1.6
2.30
0.23
1.8
2.35
0.23
Diameter pilot orifice
GENERAL
Storage capacity
Water connections**
Gas connection
Drain valve
T&P-plug litres 265
1-11.5 NPT
Rp
1
/
2
3 /
4
" - 14 NPT
3
/
4
" - 14 NPT
355
1 1 /
4
" - 11.5 NPT
Rp
1
/
2
3 /
4
" - 14 NPT
3
/
4
" - 14 NPT
Maximum operating pressure bar 8 8
Empty weight kg 122 149
* 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
10
DESCRIPTION
Load Profile
Load Profile
Energie-efficiëntie
Daily Electricity Consumption
Daily Fuel Consumption
Mixed Water 40°C (V40)
Additional Load Profile
Energy Efficiency
Daily Electricity Consumption
Daily Fuel Consumption
Mixed Water 40°C (V40)
unit
-
-
% kWh kWh GCV
ltr.
% kWh kWh GCV ltr.
BTI 85
-
-
-
XXL
B
61
-
0.033
40.294
-
496
BTI 100
-
-
-
XXL
B
60
-
0.033
40.651
-
723
11
Electrical connection
Electrical supply
Frequency
220/240 V AC 50 Hz
Electrically fused to
5A
Ionisation current.
The minimal ionisation current is 0.9 micro-Amperes DC. Below this current the burner controller will assume no flame present. When in normal operation, the ionisation current wil be about 1.2 to 1.3 micro-Amperes DC when only the pilot flame is burning.
(Adjust the main burner pressure to zero to be able to measure under this condition) With pilot- and main burner in operation, the ionisation current will be about 6.0 and 6.3 micro-Amperes DC.
Ionisation current can be measured by connecting a universal-meter in series in the connection to the ionisation electrode. Make sure to measure in
Direct Current; Alternating Current in fact gives no information about the system’s behaviour.
12 11
2. FOR THE INSTALLER
2.1 Installation instructions
This water heater must be fitted in a location which will permit the provision os 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 allowed between the top of the unit and any obstruction or ceiling to allow the flue baffle and anode to be inspected, cleaned or in the case of the anode replaced if necessary.
The water heater must stand on a level surface resistant to heat, insulted in accordance with local bylaws and
Building Regulations 1985, with sufficient strength to support the weight of the unit when full of water.
This water heater must not be installed in a bathroom, bedroom or in a cupboard opening on to such rooms. This water heater must not be installed in any area where flamable materials are used or stored.
Insufficient ventilation may give rise to a risk of fire, explosion or suffocation. If in doubt consult the national and local regulations governing the installation of gas appliances or your British gas sevice department.
2.1.1 Installation
The installation of this water heater should be carried out by a suitably qualified competent person. It is a criminal offence for unqualified persons to install gas equipment.
Installation should be carried out in accordance with all local authority and
Building Regualions, Model Water
Bylaws, bylaws of the local water supplier, Building Standards (Scotland)
(Consolidation) Regulations and any relevant requirements of the Local
Authority, local gas regions and the following British Standards (current editions):
12
For domestic applications:
BS 5440 - part 1 and part 2.
BS 5546 - Installation of gas hot water supplies for domestic purposes.
BS 6700 - Specifications for design, installation and maintenance of services supplying water for domestic use within buildings and their curtilages.
BS 6798 - Specification for installation of gas fired hot water boilers of rated input not exceeding
60 kW.
BS 6891 - Specification for installation of low pressure gas pipework of up to 28 mm in domestic premises.
For non-domestic applications:
BS 5400 - part 1 and part 2.
BS 6798 - Specification for installation of low pressure gas pipework of up to 28 mm in domestic premises.
CP 342 - Code of practice for centralised hot water supply part 2, buildings other than
IM/2
IM/5 individual dwellings and the following additional Codes of
Practice.
- Purging procedures for nondomestic gas installations.
- Soundness testing
procedures for industrial and commercial gas installations.
IM/11
IM/16
- Flues for commercial and industrial gas fired boilers and air heaters.
- Notes on installation of pipework (excluding 25 mm and below).
Some chemicals produce vapours which can cause rapid failure of main- and pilotburners and storage tanks if they are drawn into the combustion air supply.
13
Therefore if this water heater will be used to supply hot water to:
- hairdressers,
- dry cleaners,
- industrial degreasing processes or any other area where compounds containing halogens are used and stored, care should be ta ken that all primary and secondary air is drawn from outside atmosphere free of such contaminents.
For futher advise contact
A.O. Smith.
2.1.2 Water circulation system
A.O. SMITH water heaters are suitable for connection to vented, unvented and pumped pressurised systems. In each case appropriate valves and fittings should be used to ensure the system complies with the requirements of the water by laws, and appropriate building regulations.
When fitting it is essential the rules of
‘good practice’ are applied at all stages of installation.
Vented systems (See figur 4)
If the water heater is to be connected to a cold feed tank or cistern the hot water supply pipe must include an open vent which discharges over the cold feed cistern. The cold feed cistern must have an actual capacity of greater volume than the hourly recovery rate of the water heater(s) which it supplies. The minimum actual capacity is 50 gallons or 227 litres.
Figur 4 - Connection diagram vented systems
14
AOS 1105
1105
1) Manual gas valve
2) Stop valve
3) Three way valve
4) Safety valve
5) Non return valve
6) Circulation pump
7) Drain valve
A) Gas supply
B) Hot water outlet
C) Cold water inlet
D) Overflow
E) Return circulation loop
13
Unvented system (See figur 5)
To install an A.O. Smith water heater on an unvented cold water supply system a kit of valves and fittings fisted by the water reseach centre and complying with part G3 of the current building regulations should be used. Installation should be carried out generally as shown on the following diagram.
Figur 5 - Connection diagram unvented systems
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
8) Pressure reducing valve
9) Expansion valve
14
A) Gas supply
B) Hot water outlet
C) Cold water inlet
D) Hot water taps
E) Return circulation
15
2.1.3 Gas connection
The gas supply to this appliance must be installed in accordance with BS 6891
(1988) and British Gas Publications UP1 and UP2.
Fit the 1/2” gas supply cock supplied with this unit immediately before the gas control. No heat or soldered joints should be applied in the vicinity of the gas control, as they could cause damage to the control. All connections and joints should be tested for gas soundness with a suitable leak detector (do not use a naked flame).
N.B. When operating this unit on LPG a suitable gas supply cock should be used.
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 horizontal run of flue is required this should be kept to the minimum lenght possible and incorporate a rise of 6 cm. per metre of run. A split clip or flange should be provided in the flue close to the draught diverter for ease of servicing.
All flue materials should be corrosion resident i.e. stainless steel or galvanised and must include a tested and apprved terminal to BS 5440 part 1.
If the flue passes through any combustible marerial measures must be taken to protect against the possibility of fire.
All flues must terminate in free air space approx. 1,5 metres from any vertical surface of structure i.e. chimney stacks, roof parapets, etc. If an existing chimney or flue is to be used this should be swept clean and be free of debris before an approved liner is installed and connected to the water heater.
2.1.5 Draught diverter
The appliance has been fitted with a flue down draught safety device. The operation of the safeguard is based on the principle of the
T
hermal
R
eflux
S
afeguard (TRS).
16
This TRS can be recognized by the copper coloured spiral that is fitted to the lower edge of the draught diverter. The spiral is connected to a thermostat by means of a capillary tube. The wiring of the thermostat must be connected to the thermocouple circuit.
Important
The TRS should never be put out of operation. The reentry of flue gasses may cause poisoning.
2.1.6 Electrical connection
All electrical connections must be carried out in accordance with IEE regulations by an accredited electrical installation company. The appliance must be connected to the mains by means of a permanent electrical connection. A main switch must be fitted in the phase between the permanent connection and the water heater. The feeder cable must have cores of at least 3 * 1.0 mm
2
The connecting clamps for the electricity supply are indicated by the symbol for earth Á,
N for neutral and L for live. Always check with a voltage tester if the live and the neutral have been connected correctly in the electricity supply. The electricity supply must comply with the requirements below:
Electrical supply
220/240 V AC
Frequency
50 Hz
Electrically fused to a minimum of
5A
The maximum power consumption is
25 W
See electrical diagram for more information, appendix 1.
15
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 to see if the heater is filled with water by running a little to waste from a hot water tap connected to the heater.
2. Check wether the ON/OFF switch is in OFF-position.
3. Ensure gas supply is fully purged of air and turn on gas cock.
4. Ensure that power has been correctly supplied to the unit. Use a voltage tester to check that the live is to “L” and neutral to “N”. (Flame detection is phase sensitive).
5. When first starting, the controller can be in the lock out condition: depress the reset button to free the control.
(After manual reset, an extended prepurge/waiting time will occur).
6. Switch the ON/OFF switch into ON position. If the pilot fails to ignite within 25 seconds the controls will go to lock out and the reset button will need to be reset (wait 15 seconds before attempting reset). It may be necessary to repeat the lighting sequence a number of times on the initial light up if all the air has not been purged from the gas supply.
7. The main burner pressure has been factory set but should be checked once normal operation is established
(see ‘Ratings’ for settings).
8. Set the temperature regulator to the required setting (see
‘Descalcification’).
Note: If during normal use the reset button is pressed the gas valves will close and the automatic ignition controller will start a new sequence after releasing the reset button.
2.2.3 Shut down
Note:The water heater should only be turned off when hot water will not be required for an extended period (e.g. holidays); otherwise it should be left on.
To shut down put the ON/OFF switch into
OFF position.
16 17
2.3
Removing and replacing the control panel front cover
Removing the cover (see figure 7)
1. Remove the screw at the top centre of
the control panel.
2. Push the cover upwards until the
hooks at the lower end clear the
burner access opening and base tray.
3. Pull the lower end of the cover slightly
forward.
4. Pull the cover down until the top edge
is clear of the control panel and then
remove.
Replacing the cover (see figure 7)
1. Place the top of the cover inside the rim of the control panel and push it up as far as possible.
2. Position the bottom hooks inside the burner access opening and over the rim of the base tray.
3. Push the cover downwards until the lower hooks engage and the top screw holes align.
4. Replace the screw in the top centre of the cover.
2.4 Setting the gas pressure
The gas pressure has been set to the correct values at the factory.
Important: The following procedure must be followed when checking or setting the gas pressure:
1. Shut down the heater by switching off the mains current (switch off main switch);
2. Connect a manometer to the pressure test nipple to measure the burner pressure on the gas control.
3. Activate the heater and allow the burner to ignite;
4. Check the burner pressure. If necessary, reset it by means of the burner pressure adjusting screw.
Turning it anti-clockwise reduces burner pressure. Turning it clockwise increases burner pressure;
5. Shut down the heater, remove the manometer and close the pressure nipple;
6. Restart the heater (test for soundness).
AOS 1130
Figur 7 taking off and mounting the control panel
18 17
2.5
Temperature regulation
The appliance is under water supply pressure (maximum 8 bar). The amount of cold water that is added is equal to the amount of hot water used. The gas control block automatically regulates the gas supply. The main burner will ignite as soon as a reduction in water temperature is sended by the thermostat. The main burner will shut down as soon as the preset temperature is achieved.
At high water temperatures there is more scale buildup in the appliance. It is for this reason that it is recommended to place the temperature control knob in position of 60 °C as the accumulation of scale will be reduced.
2.6 Converting to another type of gas
For conversion of the appliance from natural gas to another type of gas, or visa versa, it is necessary to exchange the pilot injector and the main injector.
The conversion may only be executed by a qualfied competent person.
Procedure:
1. Shut the heater down. Close the main inlet gas valve and switch off the electricity supply at the main switch;
2. Remove the burner assembly;
3. Replace the injectors with the correct injectors from the conversion set.
(see table below).
Remark:
- When conversion of the appliance from natural gas to another type of gas, fix the screw on the gas block of the burner pressure control as far as the stop.
- When conversion of the appliance from another type of gas to natural gas, then the right burner pressure should be adjust.
18
2.7
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.
2.7.1 Magenesium anode
The life cycle of the anode is determined by the quality and the quantity of the water flowing through the water heater.
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 allow the pressure to drop from the water heater and the pipes;
3. Slacken the anode with a fitting wrench;
4. Check the anode and replace it if it has been reduced in diameter by 60% or more at any point on its lenght;
5. Check for water leaks.
If is necessary to replace the anode it should be replaced by one of the same type. The type of anode required can be detemined on the basis of the type of the appliance and the serial number.
2.7.2 Cleaning
1. Close the gas supply and demount the burner after it has cooled down
2. Disconnect the burner assembly from the gas control
3. Remove the complete burrner assembly
4. Clean the burner with a soft brush
5. Check the pilot burner and clean it if so required
6. Check the combustion chamber, flue tube and flue baffle and clean these if required
After cleaning of the pilot- and main burner the operation of these should be checked. If necessary the burner pressure should be reset.
19
2.7.3 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 information a decalcification instruction is available.
2.7.4 Spare parts
To be able to order spare parts it is important to note the type of appliance as well as the serial number of the appliance. Based on this information the data concerning the spare parts can be determined.
2.8 Inlet combination
Not applicable in U.K. and Ireland.
2.9
Gas smell
Immediately shut the main gas tap.
Do not light any fire or switch o any lights, do not use any electrical switches or alarm bells. Open windows. Thoroughly inspect all gas connections and, if the gas smell persists, alert the local gas company and/or your installer.
2.10 Condensation
If the appliance is filled with cold water or if the hot water consumption is very high, condensation of flue gasses will occur on the cold surfaces of the combustion chamber and the flue tube.
The water drops will fall on the burner and cause a sizzling noise. This is a normal phenomenon that will disappear as soon as the appliance reaches its normal operating temperature.
Important warning
The applicance should never be taken into operation with a closed cold water supply!
Provision should always be made for expansion.
Unit
G20
Supply pressure mbar 20
Burner pressure mbar 12.0
Diameter main injector mm 3.90
Diameter pilot injector mm 0.56/
0.41
BTI 85
G30
30
30
2.30
0.23
G31
37
37
2.30
0.23
G20
20
7.9
4.50
0.56/
0.41
BTI 100
G30
30
30
2.35
0.23
G31
37
37
2.35
0.23
20 19
3. FOR THE USER
3.1 Commisioning
Warning
Installing and commissioning 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 aeration.
The water heater is filled as soon as cold water flows from all taps;
3. Close all hot water taps.
3.1.2 Putting into operation
1. Check to see if the heater is filled with water by running a little to waste from a hot water tap connected to the heater;
2. Check wether the ON/OFF switch is in OFF-position;
3. Ensure gas supply is fully purged of air and turn on gas cock;
4. Ensure that power has been correctly supplied to the unit. Use a voltage tester to check that the live is to “L” and neutral to “N”. (Flame detection is phase sensitive);
5. When first starting, the controller can be in the lock out condition: depress the reset button to free the control.
(After manual reset, an extended prepurge/waiting time will occur);
6. Switch the ON/OFF switch into ON position. If the pilot fails to ignite within 25 seconds the controls will go to lock out and the reset button will need to be reset (wait 15 seconds before attempting reset). It may be necessary to repeat the lighting sequence a number of times on the initial light up if all the air has not been purged from the gas supply;
7. The main burner pressure has been factory set but should be checked once normal operation is established
(see ‘Ratings’ for settings);
8. Set the temperature regulator to the required setting (see ‘Descalcification’).
3.1.3 Use
The appliance is under water supply pressure (maximum 8 bar). The amount of cold water that is added is equal to the amount of hot water used. The gas control block automatically regulates the gas supply. The main burner will ignite as soon as a reduction in water temperature is sended by the thermostat. The main burner will shut down as soon as the preset temperature is achieved.
At high water temperatures there is more scale buildup in the appliance. It is for this reason that it is recommended to place the temperature control knob in position of 60 °C as the accumulation of scale will be reduced.
20
21
3.2
Fault overview
Fault
Gas smell
Heater is off or does not ignite
Explosive ignition
Poor flame image
Water leakage
Possible cause
Burner automat is in lock condition
Blocked chimney
Overheat thermostat is engaged
Insufficient hot water, or none at all
Gas supply shut off
Temperature set too low
Thermal Reflux Safeguard has shut down the heater
Overheat thermostat is engaged
Supply of hot water exhausted
Unindentifiable cause
Wrong inlet gas pressure and/or burner pressure
Dirty injectors
Wrong inlet pressure and/or burner pressure
Condensation of (flue) gasses
Leakage from other water heater or pipes in the vicinity
Corrective action
If you smell gas you should immediately close the main gas tap, you should not fight any fire or switch on light. electrical switches or bels. Open windows and immediately contact your installer or the local gas company
Reset burner automat with the RESET button on the top of the collumn
Contact your installer to investigate the cause and rectify it
Cool down the water in the equipment and adjust the water temperature to a lower setting (60 °C).
Reset the safety thermostat using the RESET button.
Open the inlet gas valve
Set water temperature to higher valvue
(60 °C recommended)
After resetting the TRS activate the heater.
If this occurs regularly, call your installer
Cool down the water in the equipment and adjust the water temperature to a lower setting (60 °C).
Reset the safety thermostat using the RESET button.
Reduce hot water use. Give the heater time to heat the water
Switch off the elactricity to the heater, close the inlet gas valve and call your installer
Set the correct inlet pressure and/or burner pressure
Clean injectors
Set the correct inlet pressure and/or burner pressure
See chapter “Condensation”
If possible trace the cause and/or call your installer
22 21
4. WARRANTy
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 or authorised agent to be defective in material or workmanship, the warrantor will exchange such part or component.
4.2
Guarantee of the tank
If within 3 years of the original installation date, the tank fails due to rust or corrosion from the water side, the warrantor will supply a complete new water heater of equivalent size and duty (excluding delivery and installation charges). On the replace-ment water heater a guarantee will be granted sufficient to cover the ubexpired portion of the original 3 years guarantee of the originally installed water heater.
4.3 Conditions for installation and use
The guarantee applies to the heater only while it remains in its original location, and is installed in accordance with local plumbing and building regulations and all relevant Codes of Practice.
The water heater should alse have been used only: a) for potable water free to circulate at all times and with the tank free of damaging scale deposits; b) at temperatures not exceeding the maximum setting of its thermostat and ECO (Energy Cut Off device); c) At water pressures and/or energy inputs which do not exceed those stated on the rating plate of the water heater; d) in a non corrosive atmosphere or area; e) with an approved temperature and pressure relief valve of adequate capacity not exceeding the working pressure rating shown on the water heater, and installed in conformity with A.O. SMITH Water Products
Companies installation instructions; f) when anode(s) have been inspected and renewed, if they are worn or erroded by 50% or more at any point of their length.
4.4
Exclusions
The guarantee will be null and void: a) if the water heater has been damaged by an external cause; b) in case of misuse, neglect (including frost damage) or incorrect use of the water heater; c) in case of unauthorised alteration, modification or repair; d) in case of ingress into the water heater of chemicals, pollutants or contaminants; e) if the hardness of the incoming water is, or has been, softened below 60 ppm CaCO3; f) if the water heater is effected by corrosive vapours such as those found in hairdressers, dry cleaners and laundries or where some industrial degreasing products are used and stored (for further information and advise please contact the A.O. SMITH technical
Department).
4.5
Range of guarantee
All replacement water heaters supplied under the terms of this warranty will be supplied ex stock on a F.O.B basis. A.O.
SMITH accepts no responsability for carriage, labour or other installation costs.
22
23
4.6 Claims
Any claims under this warranty should be initiated with the dealer who originally sold the water heater or with any other dealer or stockist of the warrantors products.
4.7 No other guarantee or warrantee 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 liable by virtue of this guarantee or otherwise for damage to any persons or property when arising out of contracts or tort.
The terms of this guarantee do not effect your statutory rights under United
Kingdom Consumer Legislation.
This guarantee applies to the following models:
BTI 85 G
BTI 100 G
24
23
APPENDIX 1
Connection diagram BTI models
220-240V AC
50 Hz
U
2 1
K
4
11
H
4
11
12
4
12
1
B
M
2
2
11
P
2
K
1
L M
2 2 4
P Q R
3
3 2 1 4
N L A B C D E F G H I
N
1
1 2 4
4
4
6 2 5
12
5
6
V
W
R
3 3 3 3
L
N
F
G
C
D E
2 1
3 2 4 4
12 11 10 9 8 7 6 5 4 3 2 1
N L' L
S
A
X
T
0
REV.
1 brown
2 blue
3 yellow/green
4 black
5 white
6 red
A Ignition controller
B ON/OFF switch
C Pilot burner
D Spark electrode
E Flame probe
F Transformer flame detection *
G TRS
CHANGES
9239
CHG.NO.
MS 100815
BY DATE
H Control thermostat
K Safety thermostat
M Remote button
N Terminal block
P Terminal block
R Earth terminals
A4
T Gas control valve
U Terminal block
V Tank earth
W Casing earth
NUMBER
IMD-1196
* Optional
25
26
0311899 R0
Uw Installateur
Your Installer
Ihr Installateur
Votre Installateur
Su Instalador
Instalador
Ditta Installatrice
Twój Instalator
Eγκαταστάτη Σας
Nederland
A.O. Smith Water Products Company B.V.
Postbus 70
5500 AB VELDHOVEN
0800 - AOSMITH (2676484) [email protected]
www.aosmith.nl
France
A.O. Smith L’Eau Chaude SARL
14, allée Charles Pathé
1800 Bourges
01 3975 5140 ou 008008 - AOSMITH (2676484) [email protected]
www.aosmith.fr
United Kingdom
A.O. Smith Water Heaters
Unit B8 Armstrong Mall, Southwood Business Park,
Farnborough, Hampshire, GU14 0NR
0870 - AOSMITH (267 6484) [email protected]
www.aosmith.co.uk
Deutschland
A.O. Smith Water Products Companny B.V.
Postbus 70
5500 AB Veldhoven
+31 40 29 42 500 [email protected]
www.aosmith.de
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Table of contents
- 4 1. General
- 4 Description of the appliance
- 4 Packaging material
- 4 Disposal
- 5 Technical safety equipment
- 5 1.4.1 Gas control valve
- 5 1.4.2 Control panel
- 7 1.4.3 Operation of the storage water heater
- 7 1.4.4 Combustion products discharge safety device
- 8 Technical description
- 8 1.5.1 Dimensions
- 10 1.5.2 Technical data
- 13 For the installer
- 13 Installation instructions
- 13 2.1.1 Installation
- 14 2.1.2 Water circulation system
- 16 2.1.3 Gas connection
- 16 2.1.4 Flue system
- 16 2.1.5 Draught diverter
- 16 2.1.6 Electrical connection
- 17 Commissioning
- 17 2.2.1 Filling the water heater
- 17 2.2.2 Putting into operation
- 17 2.2.3 Shut down
- 18 Removing and replacing the control panel front cover
- 18 Setting the gas pressure
- 19 Temperature regulation
- 19 Converting to another type of gas
- 19 Maintenance
- 19 2.7.1 Magenesium anode
- 19 2.7.2 Cleaning
- 20 2.7.3 Decalcification
- 20 2.7.4 Spare parts
- 20 Inlet combination
- 20 Gas smell
- 20 Condensation
- 21 For the user
- 21 Commisioning
- 21 3.1.1 Filling the water heater
- 21 3.1.2 Putting into operation
- 21 3.1.3 Use
- 22 Fault overview
- 23 4. Warranty
- 23 Guarantee in general
- 23 Guarantee of the tank
- 23 Conditions for installation and use
- 23 Exclusions
- 23 Range of guarantee
- 24 Claims
- 24 made on behalf of A.O. sMITH Water Products company
- 25 Appendix