Johnson & Starley SCT 75-75 G Leitfaden
1
SCT 75-75 G
SCT100-95G
WATERSTORAGEHEATERS
UNITED KINGDOM / IRELAND
MODEL
INSTALLATION- AND USER
INSTRUCTIONS
2
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 commissioning 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,
SERVICEAND/ORPRODUCTLIABILITYINCASEOFUNAUTHORIZED
ALTERATIONS,PRODUCTMODIFICATIONSORREPAIR.
3
CONTENTS PAGE
1. General........................................................................................................ 5
1.1 Description of the appliance .......................................................................... 5
1.2 Technical safety equipment ........................................................................... 6
1.3 Technical description..................................................................................... 8
1.3.1 Dimensions .................................................................................................... 8
1.3.2 Technical data ............................................................................................. 10
2. Fortheinstaller. ...................................................................................... 11
2.1 Installation instructions ................................................................................ 11
2.1.1 Installation .................................................................................................... 11
2.1.2 Water connections ...................................................................................... 11
2.1.3 Gas connection ........................................................................................... 12
2.1.4 Flue system ................................................................................................. 13
2.1.5 Draught diverter........................................................................................... 13
2.2 Commissioning ............................................................................................. 14
2.3 Pilotadjustment ............................................................................................ 15
2.4 Putting out of operation................................................................................ 15
2.5 Temperature regulation................................................................................ 15
2.6 Setting the nominal heat input ...................................................................... 16
2.7 Conversion procedure................................................................................. 16
2.8 Maintenance ................................................................................................ 18
2.8.1 Sacrificial anode .......................................................................................... 18
2.8.2 Cleaning ....................................................................................................... 19
2.8.3 Decalcification ............................................................................................. 19
2.8.4 Spare parts.................................................................................................. 19
2.9 Inletcombination .......................................................................................... 20
2.10 Fault finding ................................................................................................. 20
2.11 Gassmell..................................................................................................... 20
2.12 Condensation............................................................................................... 20
3. For the user. ............................................................................................. 21
3.1 Commissioning ............................................................................................. 21
3.2 Use .............................................................................................................. 21
3.3 Putting out of operation................................................................................ 21
3.4 Fault finding ................................................................................................. 22
4. Warranty. .................................................................................................. 23
4
Drawing 1 - Cross-section of the
appliance
1) Draught diverter
2) Hot water outlet
3) Insulationmaterial
4) Flue tube
5) Glass lined tank
6) Gas control valve
7) Cold water inlet pipe
8) T&P safety connection
9) Steel jacket
10) Flue baffle
11) Sacrificial anode
12) Drain tap
13) Atmospheric burner
5
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 (EN 89).
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 ventilator and with a flue gas
down draught safeguard (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 glass-lined on the inside. In
addition the tank is fitted with a
sacrificial anode as an extra protection
against corrosion. A thick 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 transfer. The flue
gasses pass their heat on to the water
by means of radiation and convection.
The flue gasses are guided to the
chimney via the draught diverter. The
exhaust of the flue gasses is realized
by natural thermal draught (see
drawing 1).
Dead legs on a hot water installation are
undesireable. Where possible they
should be avoided. Where the inclusion
on the system of a dead leg is
unavoidable the following restrictions
should be applied:
-for pipes not exceeding 19 mm.
inside diameter; maximum lengh of
dead leg permitted 12.0 metres;
-for pipes exceeding 19 mm. but not
exceeding 25 mm. inside diameter;
maximum length of dead leg 7.5
metres;
-for pipes with an inside diameter
exceeding 25 mm. maximum dead leg
3.0 metres.
6
1.2 Technical safety
equipment
Gas control block
The water heater has been fitted with a
gas control block consisting of a
thermo-electrical pilot flame safeguard,
pilot flame pressure regulator, burner
pressure regulator, a control thermostat
(adjustable between 40°C and 81°C)
and a safety thermostat (90°C). This
gas control block with its simple and
secure control respectively switches
the gas supply to the main burner on or
off.
This gas control block is suitable for
gasses from the first, second and third
gas family. The maximum inlet pressure
is 50 mbar.
Flue down draught safety device
The heater is fitted with a flue gas
blowback safety device. The
functioning of the safety device is
based upon the principle of the Thermal
Reflux Safeguard – TRS for short –
shown in Fig.2.
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.
Drawing 2 - Gas control block with T.R.S. 1) T.R.S.thermostat
2) Sensor T.R.S. thermostat
3) Thermocouple with built-in
interrupter
4) Thermocouple
5) Gas control block
6) Reset button
7) Pilot burner
8) Temperature regulator knob
7
It is the aim of the T.R.S. to prevent flue
gasses from the water heater entering
the room where the water heater has
been placed, instead of passing through
the flue to outside atmosphere. The
thermo-couple circuit is interrupted and
the gas supply is disconnected as soon
as the T.R.S. is activated by heating of
the sensor by the hot gasses.
After the cause of the reentry of flue
gasses has been traced the device can
be put back into operation again. In case
of T.R.S. the RESET button has to be
pressed first.
If this failure occurs frequently, this
indicates that the flue suffers from
down draught conditions. We advice
that necessary remedial actions be
carried out by a competent person.
Important
If the water heater is put out of
operation by a failure, this may be
caused by the T.R.S.. If there is a
RESET button on the thermostat, this is
visible because the button rose. The
device can be put back into operation
by pressing the RESET-button.
The T.R.S. should never be put out
of operation. Reentry of flue
gasses to the building could be
harmful and cause poisoning or
death.
Attention:
Instruction addition for installer.
Fitting the Thermal Reflux Safeguard:
1. Remove the two screws from the lid;
2. Position the support (with pre-
assembled TRS) onto the lid;
3. Secure the support, using both
screws;
4. Interconnect the male and female
connectors on the lid.
8
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. (rounded off on 5 mm)
A 1585 1780
B 1450 1640
D 645 675
E 735 765
G 130 130
K 375 375
M 1505 1685
N 1505 1685
R 285 285
S 1280 1460
1 Cold water inlet
2 Hot water outlet
3 Gas control
4 Drain valve
5 T&P relief valve tapping
Dimensions SCT 75-75 SCT 100-95
9
Drawing 3 - Dimensions
10
1.3.2 Technical data
Device category: II2H3+
Description Unit SCT 75-75 SCT 100-95
DATA NATURAL GAS G20 - 20 mbar
Nominal load (gross) kW 25.1 26.7
Nominal capacity kW 19.2 20.4
Supply pressure mbar 20 20
Burner pressure mbar 12.5 8.7
Gas consumption * m3/h 2.40 2.50
Diameter main orice mm 3.90 4.50
Diameter pilot orice mm 2 x 0.27 2 x 0.27
Heating time ∆T= 45 K min. 43 55
DATA BUTANE G30 - 30 mbar
Nominal load (gross) kW 24.5 26.0
Nominal capacity kW 19.2 20.4
Supply pressure mbar 30 30
Burner pressure (G30) mbar 30 30
Gas consumption (G30)* m3/h 1,80 1.90
Diameter main orice (G30) mm 2.30 2.35
Diameter pilot orice (G30) mm 2 x 0,16 2 x 0,16
DATA PROPANE G31 - 37 mbar
Nominal load (gross) kW 24.6 26.1
Nominal capacity kW 19.2 20.4
Supply pressure mbar 37 37
Burner pressure (G30) mbar 37 37
Gas consumption (G30)* m3/h 1.8 1.9
Diameter main orice (G30) mm 2.30 2.35
Diameter pilot orice (G30) mm 2 x 0.16 2 x 0.16
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
Weight (empty) kg 117 144
* 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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