A.O. Smith BTI - 65 Guida

MODEL BTI 65 G

HOT WATER STORAGE HEATER

UNITED KINGDOM / IRELAND

INSTALLATION AND USER

INSTRUCTION

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.

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

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.

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

AOS 1120

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

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.

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

Figur 3 - Dimensions

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

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