State Water Heaters SOF 85 220 G Manual

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INSTALLATION INSTRUCTIONS
AND
USERS MANUAL
UNITED KINGDOM / IRELAND
WATER HEATERS
MODELS SOF 85 220 G
SOF 85 260 G
SOF 85 300 G
SOF 75 390 G
SOF 75 470 G
SOF 70 700 G

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FOREWORD
Before attempting to install this water heater please read the installation instructions. Read the users manual before igniting
the heater. Failure to follow these instructions meticulously could lead to the risk of an explosion and/or a fire and can cause
material and/or physical injuries.
An accredited installer must install the heater and commission it according to the locally valid requirements. The heater may
only be installed in an area that meets the required ventilation regulations.
STATE WATER HEATERS CANNOT ACCEPT ANY RESPONSIBILITY FOR GUARANTEE, SERVICE AND/OR PRODUCT
LIABILITY IN THE EVENT OF UNAUTHORIZED CHANGES, PRODUCT MODIFICATIONS OR REPAIRS.

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CONTENTS PAGE
1. GENERAL
1.1 Description of the heater ................................................................................................................. 5
1.2 Technical safety equipment.............................................................................................................5
1.2.1 Control box ...................................................................................................................................... 5
1.3 Technical description ...................................................................................................................... 6
1.3.1 Dimensions...................................................................................................................................... 6
1.3.2 Burners ............................................................................................................................................ 8
1.3.3 Technical data ................................................................................................................................. 9
1.3.4 Setting the burner head ................................................................................................................. 10
1.3.5 Setting the air valve ....................................................................................................................... 10
2. FOR THE INSTALLER
2.1 Installation procedure .................................................................................................................... 11
2.1.1 Installation ..................................................................................................................................... 11
2.1.2 Water connections ........................................................................................................................ 11
2.1.2.1 Vented system ............................................................................................................................... 12
2.1.2.2 Unvented system ........................................................................................................................... 13
2.1.3 Flue gas exhaust ........................................................................................................................... 15
2.1.4 Burner connection ......................................................................................................................... 15
2.1.5 Electrical connection ..................................................................................................................... 15
2.2 Commissioning .............................................................................................................................. 15
2.2.1 Filling the heater ............................................................................................................................ 15
2.2.2 Turning on the burner .................................................................................................................... 15
2.3 Shutting down ................................................................................................................................ 15
2.4 Usage/temperature control ............................................................................................................ 15
2.5 Maintenance .................................................................................................................................. 16
2.6 Anode ............................................................................................................................................ 16
2.7 Descaling....................................................................................................................................... 16
2.8 Condensation ................................................................................................................................ 16
2.9 Spare parts .................................................................................................................................... 16
3. FOR THE USER
3.1 Instructions for use ........................................................................................................................ 17
3.1.1 Lighting the heater......................................................................................................................... 17
3.1.2 Filling the heater ............................................................................................................................ 17
3.1.3 Commissioning .............................................................................................................................. 17
3.2 Operation....................................................................................................................................... 17
3.3 Shutting down ................................................................................................................................ 17
3.4 Maintenance .................................................................................................................................. 17
4. WHAT TO DO IN CASE OF FAILURE
4.1 General .......................................................................................................................................... 18
4.2 Fault overview ............................................................................................................................... 18
5. WARRANTY
5.1 Guarantee in general..................................................................................................................... 19
5.2 Guarantee of the tank.................................................................................................................... 19
5.3 Conditions for installation and use ................................................................................................ 19
5.4 Exclusions ..................................................................................................................................... 19
5.5 Range of guard..............................................................................................................................19
5.6 Claims............................................................................................................................................ 19
5.7 No other guarantee or warranty either expressed or implied is made on behalf
of STATE WATER HEATERS .......................................................................................................19
6. APPENDIX
6.1 Electrical diagram SOF ................................................................................................................. 20

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1. GENERAL
1.1 Description of the heater
Construction of the heater is in accordance with the
European standards for water heaters for sanitary use
(EN 89). The heaters therefore comply with the European
Guidelines for Water Heaters and are permitted to carry
the CE mark.
They are atmospheric heaters suitable for oil-fired
ventilator burners (heater category B23).
The heaters are suitable for use with a working pressure
of up to 8 bar. The cylindrical tank is made from sheet
steel containing a number of vertically placed flue tubes.
For protection against corrosion, the inside of the tank is
glass lined. The tank is also fitted with a number of
magnesium anodes for extra protection against
corrosion. A thick PU insulating layer between the tank
and the steel jacket helps to reduce heat loss.
When the heater is completely filled with water, it is
under continuous mains water pressure. When hot water
is drained from the heater, cold water immediately
enters the heater. For effective heat transfer, flue baffles
have been included in the flue tubes. Heat from the flue
gases is transferred to the water by means of radiation
and convection.
1.2 Technical safety equipment
1.2.1 Control box
The temperature control for the water heater is situated in
the control box (see figure 1), which is fitted to the heater
cover.
The water heater has been fitted with three thermostats:
- a control thermostat,
- a high-limit thermostat
- an overheating cut-out.
The control thermostat is the thermostat by means of
which the desired water temperature is set.
The high-limit thermostat acts as a safeguard against
excessive water temperatures at the top of the heater,
if as a result from a certain draining pattern (frequently
draining of small quantities), stratification of the water
temperatures in the heater occur. If both the control
thermostat and the high-limit thermostat fail
the overheating cut-out will automatically shut down
the water heater.
The overheating cut-out interrupts the current supply
to the burner, as a result of which the oil supply will stop.
The control thermostat can be set between 40°C and
80°C by means of the temperature control knob.
The high-limit thermostat switches at 84°C, the
overheating cut-out at 95°C.
The control thermostat’s sensor is located in the lower
immersion well in the control box; the sensors of the
high-limit thermostat and overheating cut-out are located
in the immersion well at the top of the heater.
If the overheating cut-out is activated, it must be
manually reset. This is only possible when the
temperature at the top of the heater has dropped below
89°C.
The control box is fitted with an ‘ON/OFF’ switch (‘I/0’). In
position ‘I’ the ventilator burner is controlled on the basis
of the heat demand from the control thermostat. In
position ‘0’ the heater is switched off.
Figure 1: Control box SOF

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1.3 Technical description
1.3.1 Dimensions
(See figure 2).
All dimensions are in millimetres (rounded off to the
nearest 5 mm)
* after installing the flue reducer
Size SOF 85 220 SOF 85 260 SOF 85 300 SOF 75 390 SOF 75 470 SOF 70 700
A 1900 1900 1900 1900 1900 2025
B 685 685 685 640 640 765
C 585 585 585 605 605 745
D 705 705 705 705 705 705
E 150* 200 200 200 200 250*
F 1700 1700 1700 1630 1630 1770
G 1720 1720 1720 1650 1650 1785
1 Hot water outlet
2 Cold water inlet
3 Drain valve
4 Burner fixing flange
5 T & P connection (temperature and pressure valves)
6 Inspection opening
7 Cleaning opening

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Figure 2: Dimensions

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1.3.2 Burners
The water heaters are suitable for oil-fired burners.
The water heaters have been examined and tested with
the following front-mounted burners from Riello:
The burners for the SOF 70 700 heaters must be fitted
with a special fire tube in view of the higher
temperatures in the heater’s combustion chamber. The
manufacturer has already fitted the special fire tube to a
burner supplied direct with the water heater. Otherwise
the special fire tube must be retrofitted. Please consult
your supplier on this matter.
The heaters are also suitable for front-mounted burners
from other manufacturers, provided that the following
conditions are met:
- The front-mounted burners must be EC approved,
- The flame length of the front-mounted burner must
be less than the diameter of the heater’s combustion
chamber. This diameter is 510 mm for all heaters,
- For the SOF 75 470 and SOF 70 700 a starting load
of 120 kW at maximum (according to EN 676) must
be set. Consult to this end the instruction manual of
the front-mounted burner used,
- The air-proving switch must be set in such a way that
it cuts out before the CO contents of the flue gas
reaches a value of 2000 ppm.
- The maximum burner pressure of the heater
amounts to 25 Pa across the entire range. The
selected burner must be able to supply at least this
pressure.
Before installing and commissioning the selected burner,
you must consult the front-mounted burner’s instruction
manual.
OIL-FIRED BURNER
MODEL TYPE
SOF 85 220 RG 2 377 T1
SOF 85 260 RG 2 377 T1
SOF 85 300 RG 3 393 T1
SOF 75 390 RG 3 393 T1
SOF 75 470 RG 3 393 T1
SOF 70 700 RG 4S 396 T1
HEATER

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DESCRIPTION Unit SOF 85 SOF 85 SOF 85 SOF 75 SOF 75 SOF 70
220 260 300 390 470 700
OIL DATA
Burner model [-] RG 2 RG 2 RG 3 RG 3 RG 3 RG 4S
Burner type [-] 377 T1 377 T1 393 T1 393 T1 393 T1 396 T1
Nozzle (Delavan) [-] 1.25x80W 1.5x80B 1.75x80B 2.25x80B 2.75x80B 4.0x80B
Nominal load (lower value) kW 62.8 75.4 87.9 113 138 201
Nominal power kW 52.3 63.3 73.9 95 116 168.8
Oil flow rate kg/h 5.3 6.3 7.4 9.5 11.6 16.9
Pump pressure bar 12 12 12 12 12 12
GENERAL
Contents litre 322 322 318 282 282 259
Number of anodes - 2 2 2 3 3 4
Number of fire tubes - 6 6 7 12 12 16
Cold water inlet - ISO-7 Rp 1½ ISO-7 Rp 1½ ISO-7 Rp 1½ ISO-7 Rp 1½ ISO-7 Rp 1½ ISO-7 Rp 1½
Hot water outlet - ISO-7 Rp 1½ ISO-7 Rp 1½ ISO-7 Rp 1½ ISO-7 Rp 1½ ISO-7 Rp 1½ ISO-7 Rp 1½
Drain valve - ¾ - 14 NPT ¾ - 14 NPT ¾ - 14 NPT ¾ - 14 NPT ¾ - 14 NPT ¾ - 14 NPT
Anode - ¾ - 14 NPT ¾ - 14 NPT ¾ - 14 NPT ¾ - 14 NPT ¾ - 14 NPT ¾ - 14 NPT
T & P connection - 1 - 11.5 NPT 1 - 11.5 NPT 1 - 11.5 NPT 1 - 11.5 NPT 1 - 11.5 NPT 1 - 11.5 NPT
Maximum working pressure bar 8 8 8 8 8 8
Weight (empty) kg 260 260 260 290 290 335
1.3.3 Technical data
The data below only apply to front-mounted burners from Riello
Oil: fuel oil, max. viscosity at 20°C: 6 mm2/s

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1.3.5 Setting the air valve
The air valve is set as a function of the water heater’s
required flow rate. During the commissioning of the water
heater, the position of the air valve must be set to the
value stated in the table below. Please refer also to the
burner’s instruction manual.
The setting of the air valve for Riello front-mounted
burners is as follows:
The values above are recommended settings and have
been determined under laboratory conditions.
A maximum CO2 figure of 12.5% applies to oil. If the CO2
figure does not meet the requirements after the air valve
has been set, the latter must be readjusted.
1.3.4 Setting the burner head
The burner head is set as a function of the water
heater’s required flow rate. During the commissioning of
the water heater, the position of the burner head must
be set to the value stated in the table below. Please also
refer to the burner’s instruction manual.
The setting of the burner head for Riello front-mounted
burners is as follows:
SOF 85 220 2
SOF 85 260 3
SOF 85 300 3
SOF 75 390 3
SOF 75 470 4
SOF 70 700 4
UNIT Notch number … in burner head
Oil-fired burner
SOF 85 220 2.4
SOF 85 260 3.5
SOF 85 300 1.7
SOF 75 390 2.7
SOF 75 470 3
SOF 70 700 3.5
UNIT Notch number … in burner head
Oil-fired burner

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2. FOR THE INSTALLER
If possible, use a trolley or fork-lift truck to transport the
heater. The heater must be vertical at all times during
transportation. The installer must ensure that the required
combustion air intake is not located in areas where
chemical substances are stored and/or used. Some
propellants, bleaches, degreasing substances and the
like, give off vapours which cause accelerated corrosion.
If the heater is used in areas where such substances are
present, the guarantee is null and void.
2.1 Installation procedure
This water heater must be fitted in a location which will
permit the provision of an approved flue system and
adequate ventilation. The water heater must stand on a
level surface resistant to heat and with sufficient strength
to support the weight of the unit when full of water. This
water heater must not be installed in a bath room,
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 local British gas service department.
2.1.1 Installation
These water heaters must be installed by a qualified
competent installer, in accordance with the following
standards and regulations:
•Gas safety (installation and use) regulations 1944.
- BS 5440 part 1 1990;
- BS 5440 part 2 1989.
•Installation should be carried out in accordance with
all local authority and building regulations, local water
authority and fire regulations and the following British
standards: British Gas Publication UP1 and UP2.
- BS 5482 part 1 1979;
- BS 5482 part 2 1979;
- BS 5482 part 3 1979;
- BS 6644;
- BS 6700;
- BS 6798.
•Some chemicals produce vapours which can cause
rapid failure of thermocouples, burners and storage
tanks if they are drawn
into the combustion air supply. Therefore if this water
heater will be used to supply hot water to:
- Hairdressers;
- Dry cleaners;
- Industrial degreasing processes;
- Any other area where compounds containing
halogens are used and stored. Care should be
taken that all primary and;
- secondary air is drawn from outside atmosphere
free of such contaminents.
For further advise contact STATE WATER HEATERS.
2.1.2 Water connections
‘STATE WATER HEATERS’ 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.

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2.1.2.1 Vented systems
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 (see figure 3).
3) T&P valve
4) Stop valve
5) Non return valve
6) Circulation pump
7) Shunt pump
9) Drain valve
11) Service valve
12) Temperature meter
Figure 3 - Typcial UK vented system
14) Hot water supply
17) Three way vent valve
A) Cold water
B) Hot water
C) Return circulation
E) Overflow
IMD-0047

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2.1.2.2 Unvented systems
To install an STATE WATER HEATERS water heater on
an unvented cold water supply system a kit of valves and
fittings listed by the water research centre and complying
with part G3 of the current building regulations and BS
7206 should be used. Installation should be carried out
generally as shown on figure 4.
1) Pressure limiting valve
3) T&P valve
4) Stop valve
5) Non return valve
6) Circulation pump
7) Shunt pump
9) Drain valve
11) Service valve
12) Temperature meter
14) Hot water supply
15) Expansion valve
16) Expansion vessel
A) Cold water
B) Hot water
C) Return circulation
Figure 4 - Typical UK unvented system.

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STATE WATER HEATERS water heaters are tested to a
maximum pressure of 12 bar and a maximum working
pressure of 8 bar.
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 length 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.
Depending on the length and insulation of the water
piping and the water demand frequency, it may be
necessary to install a circulation system on the drain
valve. The return pipe of the circulation piping can be
fitted on top of the drain valve after the selaing plug has
been removed (see figure 5)
Figure 5 – Connection point for the return piping
Depending on the water demand pattern (e.g., small
amounts frequently), it may be necessary to circulate the
water in the heater to prevent temperature stratification.
Therefore, we recommend that a circulation system is
installed in the event of such demand patterns (see figure
3 or 4).

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The electrical diagrams of all connections in the control
box are shown in the appendix, (see figure 9: Electrical
diagram).
2.2 Commissioning
2.2.1 Filling the heater
1. Fit drain valve and check that it is closed;
2. Open the cold-water tap to the heater and all
hot-water outlets in order to remove all air from the
system. The heater has been filled when cold water
runs out at all outlets;
3. Close all taps at the hot water draining points. The
heater is now under water mains pressure. At this
pressure, which can be read on a manometer, the
relief valve must not release any water.
2.2.2 Turning on the burner
The burner must be turned on in accordance with the
installation manual supplied with the front-mounted
burner.
2.3 Shutting down
For brief periods:
1. Turn the temperature control knob fully clockwise
(up to 40°C) and set the ‘I/0’ switch to ‘0’.
For longer periods:
1. Switch off the supply voltage by operating the
bipolar main switch;
2. Close the inlet oil valve;
3. Close the water inlet tap;
4. Empty the heater to prevent frost damage.
2.4 Usage / temperature control
The water temperature is controlled by the control box on
the heater. If the temperature in the water heater drops
below the set value, the control box will send a voltage
signal to the ventilator burner. The burner automation of
the ventilator burner will then ignite the burner and keep it
burning until the control box ceases to supply voltage
signals.
The desired water temperature can be set between 40°C
and 80°C. High water temperatures cause more calcium
precipitation in the water heater. Moreover, the stand-by
losses of the water heater are greater with higher
temperatures. Therefore, it is recommended to set the
control thermostat to approx. 60°C.
For reasons of safety, the water heater is equipped with a
high-limit thermostat and an overheating cut-out. If the
high-limit thermostat is activated, the heater is not locked
and the control thermostat will take over the temperature
control again as soon as the high-limit thermostat is
deactivated.
If the overheating cut-out is activated, it must be reset
manually after the water has cooled down. Upon
resetting, the water heater will resume its operation in the
usual way.
2.1.3 Flue gas exhaust
For the SOF 85 220 and 70 700 the adapter ring supplied
must be fitted prior to connecting the flue gas exhaust.
For the other models (SOF 85 260, 85 300, 75 390 and
75 470) the flue gas exhaust can be connected direct to
the water heater. The flue pipe, which is protected
against corrosion, must at least have the same diameter
as the mounting flange on the water heater. For units with
an oil-fired burner, a stainless steel flue pipe must be
installed.
For all water heaters the length of the flue system must
not exceed 9 metres.
A 45° bend corresponds to 0.5 metre of exhaust pipe, a
90° bend corresponds to 1 metre of exhaust pipe.
The following diameters of flue gas exhaust pipes apply:
2.1.4 Burner connection
For connecting the ventilator burner, please refer to the
instructions supplied with the burner.
Read these instructions carefully before attempting to
install and connect the burner.
2.1.5 Electrical connection
All electrical connections must be carried out in
accordance with IEE regulations by an accredited
electrical installation company.
The control box must be connected to the mains by
means of a permanent electrical connection. A bipolar
main switch with a contact opening of at least 3 mm must
be fitted between this permanent connection and the
heater.
The supply cable must have cores of at least 3 x 1.0
mm2. The connecting clamps for the supply voltage are
located on the connector strip in the control box. Always
check with a voltage tester if the live and the neutral have
indeed been connected correctly in the control box. This
is essential for the functioning of the ventilator burner’s
flame detection.
The electricity supply must comply with the requirements
below:
Supply voltage Frequency Fuse
230 V AC 50 Hz 6 A
(-15% / +10%) (+/- 2%)
SOF 85 220 150
SOF 85 260 200
SOF 85 300 200
SOF 75 390 200
SOF 75 470 200
SOF 70 700 250
UNIT Diameter flue gas
exhaust pipe [mm]

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2.5 Maintenance
The heater must be checked and cleaned regularly (at
least once a year) by an accredited installer, so that
correct operation is guaranteed. The bar burners, control
and safety valves, the glow igniter and anodes must also
be checked.
2.6 Anode
The life of the anode is determined by the quality and
quantity of the water flowing through the heater.
Therefore, we recommend that the anode is checked
regularly - preferably simultaneously with an internal
inspection of the glass lined tank. In order to determine
the frequency with which the anodes must be replaced,
the water side of the boiler must be checked three
months after installation. The anodes must be replaced if
more than 60% has dissolved at any point on their length.
To inspect the tank:
1. Close the cold-water inlet tap;
2. Empty the heater completely by opening the drain
valve;
3. Remove the covering plates on the heater’s outer
jacket;
4. Remove the access cover plates form the tank by
unscrewing and removing the bolts and washers,
(see figure 6);
5. To ensure watertightness of the access covers the
rubber O-rings must be replaced when the access
covers are refitted, (see figure 6).
To inspect the anodes:
1. Remove the draught diverter;
2. Unscrew the fastening screws on the lid edge;
3. Remove the lid. The hexagonal heads of the anodes
are now visible, (see figure 7);
4. Unscrew the anodes with the appropriate spanner
and replace with new anodes if required. Attention:
the anodes must make contact with the tank (metal
on metal). If the tank and the anodes are separated
electrically (as a result of the sealing material used),
the anode cannot function. This could have a
negative effect on the operating life of the tank;
5. Assemble everything in reverse order;
6. Fill the heater and test.
2.7 Descaling
Calcium deposition depends on the type of water and the
demand. In addition, calcium deposition increases at high
water temperatures. A temperature setting of 60°C is
recommended, which will keep calcium deposition to a
minimum.
Access covers are located on the right and left sides for
inspecting and descaling the tank. The access covers
can be reached via the covering plates on the outer
jacket.
Empty the heater before opening the access covers.
Descaling must be carried out with a suitable substance.
Consult the supplier or installer.
2.8 Condensation
When the heater is filled with cold water or the hot-water
consumption is very high, the flue-gases will condense
on the cold surfaces of the combustion chamber and the
flue-gas discharge pipes. The drops of water will fall on
the burner and cause a hissing sound. This is normal and
will stop as soon as the operating temperature has been
reached.
2.9 Spare parts
It is important to mention the heater, type, model and full
serial number when ordering spare parts. The spare parts
can be determined according to these numbers.
Figure 6: Inspection hatches.
Figure 7: Anodes

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3. FOR THE USER
3.1 Instructions for use
3.1.1 Lighting the heater
WARNING:
An accredited installer must install the heater and
commission it.
3.1.2 Filling the heater
1. Fit the drain cock and check that it is closed;
2. Open the cold-water tap to the heater and all hot-
water outlets in order to remove all air from the
system. The heater has been filled when cold water
runs out of all outlets;
3. Close all the hot-water taps. The heater is now under
pressure.
3.1.3 Commissioning
1. Check that the heater is filled with water and that the
oil supply to the heater is on;
2. Turn the temperature dial clockwise as far as it will
go;
3. Switch the supply voltage on by operating the bipolar
main switch;
4. Set the ‘I/0’ switch on the control box to ‘I’;
5. Turn the temperature control knob to the desired
position, preferably to approx. 60°C. The ventilator
burner will now ignite.
3.2 Operation
The water temperature is controlled by the control
thermostat in the control box on the column. If the
temperature in the water heater drops below the set
value, the control will send a voltage signal to the
ventilator burner. The burner automation of the ventilator
burner will then ignite the burner and keep it burning until
the control ceases to supply voltage signals.
High water temperatures cause more calcium
precipitation in the water heater. Moreover, the stand-by
losses of the water heater are greater with higher water
temperatures.
Therefore, it is recommended to set the control
thermostat to approx. 60°C
For reasons of safety, the water heater is equipped with a
high-limit thermostat and an overheating cut-out. If the
high-limit thermostat is activated, the heater is not locked
and the control thermostat will take over the temperature
control again as soon as the high-limit thermostat is
deactivated.
If the overheating cut-out is activated, it must be reset
manually after the water has cooled down.
Upon resetting, the water heater will resume its operation
in the usual way.
3.3 Shutting down
For brief periods:
1. Turn the temperature control knob fully clockwise and
set the ‘I/0’ switch to ‘0’.
For longer periods:
1. Switch off the supply voltage
(operate bipolar main switch);
2. Close the inlet oil valve;
3. Close the water supply tap;
4. Empty the heater to prevent frost damage.
3.4 Maintenance
Maintenance should be carried out at least once a year in
accordance with the recommendations of STATE WATER
HEATERS. Failure to carry out adequate maintenance
may render the warranty void. We recommend that you
take out a maintenance contract with your installer.

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Figure 8: Resetting the overheating cut-out
Fault Possible cause Measure
Heater is off or Chimney is blocked. Trace (or let trace) cause and rectify it.
does not ignite Overheating cut-out is activated. Let water in heater cool down and set the water
temperature to a lower value. Reset the overheating cut-out.
Let heater ignite.
Oil supply shut off. Open oil valve.
Insufficient hot Temperature set too low. Set water temperature to higher value.
water or none
at all Overheating cut-out is activated. Reset overheating cut-out after the water has cooled down
and set the water temperature to a lower value.
Supply of hot water exhausted. Reduce hot water use. Give the heater time to heat up the
water.
Cause cannot be traced. Remove voltage supply. Contact your installer.
Water leakage Insufficient sealing of the water Tighten the screw thread connections.
connections (screw thread).
Leakage from another water appliance Trace the cause.
or pipes in neighbourhood.
Please consult the front-mounted burner’s installation
manual in the event of faults in the front-mounted burner.
4. WHAT TO DO IN CASE OF FAILURE
4.1 General
If faults occur, check the following points:
•Overheat thermostat
The water heaters are equipped with an overheating
cut-out, which, in the case of a too high water
temperature, interrupts the current supply to
the burner, as a result of which oil supply is cut off.
The overheating cut-out remains activated until the
water temperature drops below the overheating
cut-out’s switching-off point. Then the water
heater can be turned on again by resetting
the overheating cut-out. Next set the control
thermostat to a lower water temperature,
(see figure 8).
•Water temperature too high:
Check if the control thermostat has been set too high.
•Wrong hot water temperature:
1. Check the control thermostat setting;
2. Check that there are no leaks or if any taps are
open.
4.2 Fault overview

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5. WARRANTY
The following conditions form the guarantee agreement
between STATE WATER HEATERS (the warrantor) and
the owner of the water heater.
5.1 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.
5.2 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 replacement water heater a
guarantee will be granted sufficient to cover the
unexpired portion of the original 3 year guarantee of the
originally installed water heater.
5.3 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
the local plumbing and building regulations and all rele-
vant Codes of Practice.
The water heater should also 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 confirmity with STATE WATER HEATERS
installation instructions;
f) When anodes have been inspected and renewed, if
they are worn or erroded by 50% or more at any point
of their length.
5.4 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 106 ppm CaCO3;
f) If the water heater is effected by corosive 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 STATE WATER
HEATERS Technical Department).
5.5 Range of guarantee
All replacement water heaters supplied under the terms
of this warranty will be supplied ex stock on an F.O.B. ba-
sis. STATE WATER HEATERS accepts no responsibility
for carriage, labour or other installation costs.
5.6 Claims
Any claim 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.
5.7 No other guarantee or warranty either
expressed or implied is made on
behalf of STATE WATER HEATERS.
With respect to the water heater in question further
STATE WATER HEATERS does not guarantee this water
heater as suitable for purpose except within the terms of
warranty detailed above. STATE WATER HEATERS 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:
SOF 85 220 G
SOF 85 260 G
SOF 85 300 G
SOF 75 390 G
SOF 75 470 G
SOF 70 700 G

20
= brown
= blue
= yellow/green
= black
= Earth
N = Neutral
L = Live
A = ‘I/0’-switch
B = Overheating cut-out
C = High-limit thermostat
D = Control thermostat
E = Male 7-pole connector
6. APPENDIX
6.1 Electrical diagram sof
H1 = Running time counter
SB = Fault alarm
Note:
If, in the case of a Riello front-mounted burner, a running
time counter (H1) is connected by means of a cable
longer than 3 m, a 47 nF capacitor must be fitted bet-
ween B4 and earth to prevent EMI.
The same applies to the installation of a fault alarm (SB);
in this case a 100 nF capacitor must be fitted between S3
and earth, if the cable length exceeds 3 m.
1
2
4
3