A.O. Smith BTI - 65 Guide

MODEL BTI 65 G
HOT WATER STORAGE HEATER
UNITED KINGDOM / IRELAND
INSTALLATION AND USER
INSTRUCTION

2
Read these installation instructions rst 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 re and could cause material damage and/or bodily harm.
Installation and commisioning should be carried out by a qualied 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.

3
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 Temperature regulation ..................................................................................... 18
2.6 Converting to another type of gas .................................................................... 18
2.7 Maintenance ..................................................................................................... 19
2.7.1 Magenesium anode .......................................................................................... 19
2.7.2 Cleaning ........................................................................................................... 19
2.7.3 Decalcication .................................................................................................. 19
2.7.4 Spare parts ....................................................................................................... 19
2.8 Inlet combination .............................................................................................. 20
2.9 Gas smell .......................................................................................................... 20
2.10 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

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 CE-marking. It is an open ued
appliance without ventilator and with a ue
gas down draught safeguard, a Thermal
Reux 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 tted 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 lled with water it continuously
is under water pressure. As hot water is
drained from the tank, cold water is added
immediately. A ue bafe has been placed
in the ue tube to improve heat tranfer. The
ue gasses pass their heat on to the water
by means of radiation and convection. The
exhaust of the ue gasses is realized by
natural thermal draught (see gur 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.

5
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 ame probe
Figur 1 - Cross section of the heater
10) Cold water inlet
11) Combustion products discharge
safety device
12) T&P valve connection
13) Outer casting
14) Flue bafe
15) Magnesium anode
16) Drain valve and secondary
return connection
17) Main burner
11
14
15
16
17
1
2
3
4
5
6
9
7
13
10
12
8
AOS 1120

6
1129
1.2 Technical safety
equipment
1.2.1 Gas control valve
The water heater is equipped with a gas
control wich regulates the ow 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
tted with a delay (softlite).
The gas control block is suitable for
gasses from the rst, 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 gur
2). For safety purposes, heaters are
always tted with two thermostats: a
control thermostat is adjustable between
40 °C and 80 °C and a safety thermostat
90 °C. The control panel is tted 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.
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
Figur 2 - Top view of the heater

7
1.2.3 Operationofthestorage
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 ame
is detected by the ionisation electrode.
Almost immediately after the pilot
ame is detected, sparking stops and
the main gas valve is openend. The
main burner is lit by the pilot ame.
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 ame 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 ame is lost during normal
run, the automatic ignition controller
repeats the start sequence.
1.2.4 Combustion products
discharge safety device
The heater has been tted with a
combustion products discharge safety
device. It is the function of the safety
device to prevent ue gases from the
water heater entering the room where
the water heater has been placed,
instead of passing through the ue to
outside atmosphere. The gas supply
is disconnected as soon as the device
is activated by hot gases owing over
the sensor. After the cause of the re-
entry of ue 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 ue 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 ue gases
to the building could be harmful and
cause poisoning or death.

8
1.3 Technical information
1.3.1 Dimensions
These water heaters are only suitable for
a ue tube with minimal the announced
diameter (dimension G).
All dimensions are given in mm. (rounded off on 5mm). See gur 3.
Dimensions BTI65
A 1680
B1510
D520
E655
G100
K 340
M1540
N1540
R 295
S1350
1Cold water inlet
2Hot water outlet
3Gas control
4Drain valve
5T&P relief valve tapping
6Clean out

9
Figur 3 - Dimensions

10
1.3.2 Technical data device category: II2H3+
* 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
Description unit BTI 65
DATA NATUREL GAS G20 - 20 mbar
Nominal capacity kW 12.7
Nominal load (gross) kW 18.1
Supply pressure mbar 20
Burner pressure mbar 12.0
Gas consumption * m3/h 1.7
Diameter main orice mm 3.40
Diameter pilot orice mm 0.56/0.41
Heating time ∆T= 45K min 45
DATA BUTANE G30 - 28/30 mbar
Nominal load (gross) kW 17.2
Nominal capacity kW 12.3
Supply pressure mbar 30
Gas consumption * kg/h 1.3
Diameter main orice mm 1.90
Diameter pilot orice mm 0.23
DATA PROPANE G31 - 37 mbar
Nominal heat input (gross) kW 16.4
Output kW 11.7
Inlet pressure mbar 37
Gas consumption * kg/h 1.2
Diameter main orice mm 1.90
Diameter pilot orice mm 0.23
GENERAL
Storage capacity liters 178
Water connections** - 3/4"-14NPT
Gas connection - Rp1/2
Drain valve - 3/4"-14NPT
Anode -3/4"-14NPT
T&P plug - 3/4"-14NPT
Maximum operating pressure bar 8
Empty weight kg 93