Johnson & Starley SCE 75-75 G Guida

MODEL SCE75-75G

SCE100-95G

HOTWATERSTORAGEHEATERS

UNITED KINGDOM / IRELAND

Installation, Commissioning and

Maintenance Instructions

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.

STATEWATERHEATERSACCEPTSNORESPONSIBILITYFORWARRANTY,SER-

VICEAND/ORPRODUCTLIABILITYINCASEOFUNAUTHORISEDALTERATIONS,

PRODUCTMODIFICATIONSORREPAIR.

CONTENTS PAGE

1. GENERAL

1.1 Description of the appliance............................................................................. 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 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. FORTHEINSTALLER

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

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

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

2.3 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 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 Inletcombination ............................................................................................. 20

2.10 Gassmell ....................................................................................................... 20

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

2.12 Important warning .......................................................................................... 20

3. FORTHEUSER

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

3.2 Use................................................................................................................. 21

3.3 Fault finding.................................................................................................... 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 flued appliance

without a fan and with a combustion

products discharge safety device

(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

sacrificial 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

figure 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 control valve

7) Control panel

8) Waterway access cover

9) Intermittent pilot burner and flame

probe

Figure 1 - Cross section of the heater

10) Cold-water inlet

11) Combustion products dicharge

safety device

12) T&P valve connection

13) Outer casting

14) Flue baffle

15) Sacrifical anode

16) Drain valve and secondary

return connection

17) Main burner

AOS 1120

1.2 Technical safety

equipment

1.2.1 Gascontrolvalve

The water heater is equipped with a

gas control valve 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 Controlpanel

Temperature control for the water

heater is housed in the control column

(See figure 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 column 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.

Figure 2 - Top view of the heater

IMD 0392

135

A)Hot water outlet

B) Cold water inlet

1) Electrical connection

2) ON/OFF switch

3) Ignition controller reset button

4) Temperature regulator knob

5) Safety thermostat reset button

1.2.3 Operation of the storage

water heater.

Normaloperation

When there is a demand for heat a

waiting period of about 1 second

elapses before the built-in spark gene-

rator 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.

1.2.4 Combustionproducts

discharge safety device

The water 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 gasses flowing over

the sensor.

After the cause of the re-entry of flue

gasses 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 remendial action.

Important

The combustion products dis-

charge safety device should never

be put out of operation.

Re-entry of flue gasses to the buil-

ding could be harmful and cause

poisoning or death.

1.3 Technical description

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. (roun-

ded off on 5mm). See drawing 3.

Dimensions SCE 75-75 SCE 100-95

A 1585 1780

B 1450 1640

D 645 675

E 770 775

G 130 130

K 340 340

M 1505 1685

N 1505 1685

R 285 285

S 1280 1460

1 Cold water inlet

2 Hot water outlet

3 Gas control valve

4 Drain valve

5 T&P valve tapping

6 Access door opening

Figure 3 - Dimensions

1.3.2 Technical data device category: II2H3+

Description Unit SCE 75-75 SCE 100-95

DATA NATURAL GAS G20 - 20 mbar

Nominal load (gross) kW 25.1 26.7

Nominal output kW 19.2 20.4

Supply pressure mbar 20 20

Burner pressure mbar 12.0 7.9

Gas consumption * m3/h 2.40 2.50

Diameter main orice mm 3.90 4.50

Diameter pilot orice mm 0.56 / 0.41 0.56 / 0.41

Heating time ∆T= 45 K min. 43 55

DATA BUTANE G30 - 30 mbar

Nominal load (gross) kW 24.5 26.0

Nominal output kW 19.2 20.4

Supply pressure mbar 30 30

Gas consumption* m3/h 1,8 1.9

Diameter main orice mm 2.30 2.35

Diameter pilot orice mm 0.23 0.23

DATA PROPANE G31 - 37 mbar

Nominal heat input (upper valvue) kW 24.6 26.1

Nominal output kW 19.2 20.4

Inlet pressure mbar 37 37

Gas consumption* kg/h 1.8 1.9

Diameter main orice mm 2.30 2.35

Diameter pilot orice mm 0.23 0.23

GENERAL

Storage capacity litres 265 355

Water connections** -1 - 11.5 NPT 11/4 - 11.5 NPT

Gas connection -Rp 1/2Rp 1/2

Drain valve -3/4" - 14 NPT 3/4" - 14 NPT

T&P-plug -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

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