OSO HOTWATER ECOLINE COIL RI User manual

- 1 -
Components supplied with the unit for site tting
(See also page 2 for component list)
* Multibloc valve, includes pressure reducing valve, line strainer, balanced cold water take off,
(for shower or bidet only) check and expansion valve.
* Tundish
* 3/4’’ x 22mm Elbow / Drain Cock
* Motorised valve
* Expansion vessel.
Components factory tted
* Immersion heater(s)
* Thermostats / thermal cut-out
* Temperature and pressure relief valve.
Installation details
The OSO unvented unit is designed for use with supply pressure up to 10 bar. For pressures
over 10 bar an additional pressure reducing valve must be tted in the supply pipe to the unit.
PRODUCT REF. 120 150 180 210 250 300
HEIGHT 770 915 1060 1200 1450 1660
DIAMETER 580 580 580 580 580 580
WEIGHT EMPTY 30,5 38,0 40,5 44,5 51,5 56,0
MAX WEIGHT FULL 150 181 212 244 299 347
COIL SURFACE AREA - M² 0.4 0.8 0.8 0.8 0.8 0.8
142049-02 09-2015
This cylinder is manufactured and approved in accordance with EN 12897:2006.
This manual gives detailed advice for installation and should be read carefully
prior to tting any unvented unit.
This OSO cylinder must be installed by a competent person and be installed in
compliance with the OSO Installation and Maintenance Instructions, all current
legislation, codes of practice and regulations governing the installation of unvented
hot water cylinders in force at the date of installation.
Health and Safety
Manual Handling Operations Regulations 1992 denes manual handling as: “any
transporting or supporting of a load (including the lifting, putting down, pushing,
pulling, carrying or moving thereof) by hand or bodily force”. The Regulations set no
specic requirements such as weight limits. However common sense still has to be
used based on an ergonomic approach for each individual.
DIMENSIONS AND WEIGHTS TABLE 1
PLEASE LEAVE THIS MANUAL WITH THE OSO UNIT AFTER INSTALLATION
INSTALLATION MANUAL
ECOLINE

- 2 -
General Layout Fig: 1
1 Return 3/4” BSP Boiler
2 Flow 3/4” BSP Boiler
3 Pressure Reducing Valve Multibloc
(3 bar) Includes Item 4
4 Expansion relief valve (6 bar) 355030
5 Temperature and Pressure 550853
Relief Valve
6 Tundish 219005
7 Immersion Heater 71259
8 Immersion Heater Control Thermostat 80020
9 Indirect Control Thermostat 80030
10 Cold Feed Tube
(Not supplied see Table 2)
11 Hot Water Outlet 3/4” BSP
12 Elbow / Drain Cock 250445
13 Cable Entry
14 Electrical Box
15 Discharge Pipe (Not supplied)
16 Motorized Valve (Not Factory Fitted) 92000
17 Expansion vessel AX 12, 18 or 24
18 Clip for Thermistor
Size Lenght of tube (ø22) mm Exp. vessel pre charge
120 600 3 bar
150 800 3 bar
180 800 3 bar
210 900 3 bar
250 1150 3 bar
300 1350 3 bar
KEY Part No. KEY Part No.
TABLE 2
ECOLINE SINGLE COIL CUTAWAY VIEW

- 3 -
Positioning the unit
The water heater should be tted level on a hard surface with sufcient load strength to take the full
weight of the cylinder (see table 1 page 1). There are no limitations regarding the tting distance
from walls etc., but it is strongly recommended to ensure easy access to all pipe ttings etc. There
should be at least 80 cm of free space in front of the water heater to ensure easy access for servic-
ing and maintenance.
Protection from frost
If the water heater is in danger of being exposed to frost while not operating under electric power,
the unit must be drained to avoid damage. Make sure the electric power is turned off before drain-
ing, otherwise the heating elements can be damaged and the warranty is void. Draining instruc-
tions, see “Commissioning” on page 4.
Cold water supply
1. To obtain the best performance from your OSO unvented system it is advisable to feed the unit
with an uninterrupted supply.
2. Before connecting to the multibloc, ush the cold supply pipework of all ux and debris.
3. Locate the water heater in a suitable position to facilitate the installation of the cold water
supply, discharge ttings and pipework. Also take into account access to the immersion heater.
4. Fit the combined male elbow drain cock to cold supply point (13), so that the compression
tting is vertical.
5. Fit the length of copper tube 22mm specied in Table 2 to the cold feed elbow (see 4 above)
to include a Tee piece if a secondary return is required
6. Fit the pressure reducing valve (3) to the top of the copper tube (see 5 above).
7. Connect 15mm copper tube from the expansion relief valve (4) and also from the T & P valve
(5) and join together in a Tee as shown on page 2
8. Fit the tundish (6) to the bottom connection of this tee.
9. If a balanced mains pressure cold water supply is required to a shower or bidet (over rim type
only), remove the blanking cap from the pressure reducing valve (3) and connect to the shower
or bidet cold supply. Do not use this balanced cold outlet to feed all cold outlets.
10. Connect the cold supply to the PRV (3).
11. Fit the expansion vessel to the wall close to the water heater using the enclosed mounting
bracket. Connect the expansion vessel to the PRV, as shown on page 2.
Hot water supply
12. Connect the hot water supply pipe to the outlet (9). Ensure connection is water tight.
Secondary return (optional)
13. Connect secondary return if required to the Tee piece in the cold feed tube see 5 above (see
page 12).
Discharge pipe
14. Connect the discharge pipe from the tundish (6). This must have a continuous fall and be tted
in accordance with The Building Regulations (see page 16). The tundish should be installed
away from electrical devices.
Boiler Primaries - Primary ow & return and motorised valve
15. The boiler primary ow and return connections should be made connections 1 & 2. The
motorized valve can be connected to either the primary ow or return pipe. The primary ow
and return ttings are 3/4’’ BSP female. The valve has 22mm x copper connections. The
direction of primary ow in the coil is bottom to top. The maximum operating temperature of the
primary ow would typically be 82°C.
16. For electrical connection of the motorised valve and immersion heater, please read Electrical
Installation Instructions. (Pages 7 - 11).
Tundish
Install theTundish in a vertical position within a maximum of 600mm from the temperature and
Pressure Relief Valve drain connection. Ensure the expansion relief pipework discharges through the
tundish. Tundish pipework must be 22mm with a minimum vertical length of 300mm below tundish.
Maximum permitted length of 22mm pipework is 9m. Each bend or elbow is equivalent to 0.8m of
pipework. All pipework must have continuous fall and discharge in a safe, visible position. If any doubt,
refer to Building Regulation G3.
POSITIONING - COLD WATER SUPPLY

- 4 -
Product Weight Weight Heat-up (mins) Rating (kW) Heat loss Recovery Primary Usable hot
 ref. empty full coil coil kWh/24h rate(70%) owrate waterat40°C
120 30,5 150 21.1 13.6 1.08 15 15 l/min. - 80°C 160
150 38,0 181 24.3 17.2 1.30 17 15 l/min. - 80°C 223
180 40,5 212 29 17.3 1.44 20 15 l/min. - 80°C 253
210 44,5 244 33 17.1 1.59 23 15 l/min. - 80°C 307
250 51,5 299 42 16.8 1.87 29 15 l/min. - 80°C 391
300 56,0 347 49.5 16.5 2.08 35 15 l/min. - 80°C 468
Filling up
1. Open a hot tap.
2. Open the cold water supply valve
3. When water ows from hot tap, close the tap
4. Allow the system to stabilize for 5 minutes
5. Open each hot water tap in turn to expel air from the system pipe work.
6. Check for leaks.
7. Manually operate Temperature and Pressure Relief Valve (5) to ensure free water ow through
discharge pipe. (Turn knob to left.)
COMMISSIONING
Product Max. design Operating pressure Pressure drop primary heater Temp. / pressure Safety valve Exp. vessel
 ref. pressure CWfeed&coil coil reliefvalve Pressure/conn. capacity
120 6 bar cw in 3 bar, coil 2.5 0.03 bar 90-95°C / 10 bar 6 bar / 15mm - 1/2” 12 l.
150 6 bar cw in 3 bar, coil 2.5 0.05 bar 90-95°C / 10 bar 6 bar / 15mm - 1/2” 12 l.
180 6 bar cw in 3 bar, coil 2.5 0.05 bar 90-95°C / 10 bar 6 bar / 15mm - 1/2” 18 l.
210 6 bar cw in 3 bar, coil 2.5 0.05 bar 90-95°C / 10 bar 6 bar / 15mm - 1/2” 18 l.
250 6 bar cw in 3 bar, coil 2.5 0.05 bar 90-95°C / 10 bar 6 bar / 15mm - 1/2” 24 l.
300 6 bar cw in 3 bar, coil 2.5 0.05 bar 90-95°C / 10 bar 6 bar / 15mm - 1/2” 24 l.
TABLE 4
TABLE 3
Note: Temperature rise is from 15 to 60°C. Coil heating performance based on a primary ow rate of 15 l/min. at 80°C.
TestresultsareinaccordancewithBSEN12897:2006.

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Thermostat connection
When connecting cables to thermostats, use spade or ring connectors as shown in diagram. Ensure that
connector is less than 10mm in outer dimension and ts inside the shoulders of the thermostat and is not
tightened onto the top of the shoulders.
Immersion heaters
The immersion heater is designed as an auxiliary heater as an emergency back-up.
Wiring instructions for the immersion heater is located on the reverse side of the electrical box lid. Follow
the wiring instructions connecting the live, neutral and earth as indicated. The electrical connection to
the immersion heater must conform to current IEE wiring regulations. The unit must be permanently
connected to the electrical supply through a double-pole linked switch with a minimum break capacity of
13 amps. All internal wiring is factory mounted. The immersion heater has a working thermostat adjustable
between 40°C - 70°C. A safety cut-out is also incorporated within the thermostat and will operate at 85°C
± 3°C. Should this happen, press the reset button.
Important: Before resetting the safety cut-out or altering the thermostat setting, isolate electrical
supply to the unit prior to removal of the lid. Ensure the lid to the electrical box is replaced
correctly and the retaining screw is tted.
Motorised valve
To comply with regulations governing the installation of indirect unvented cylinders, a motorised valve must
be tted in the primary ow or return. Your OSO unit has been supplied with a two port motorised valve,
which will act as a positive energy cut-out should the safety cut-out operate.
The motorised valve will also control the temperature of the domestic stored water via the cylinder
thermostat, which is located in the electrical box. The unit should be installed on an “S” or “Y” plan system.
Please follow the instructions carefully. All electrical connections must conform to current IEE
wiring regulations. The working thermostat is adjustable between 40°C - 70°C. A safety cut-out is also
incorporated within the thermostat and will operate at 85°C ± 3°C. Should the safety cut-out be brought
into operation, the motorised valve will operate and close down the primary ow to the cylinder. To reset
the safety cut-out and the motorised valve the reset button must be pressed in (see g.4 page 8).
ELECTRICAL INSTALLATION
R
E
S
E
T
R
E
S
E
T
M2
1
2
3
4
70 40
60 50
POWER SUPPLY CABLE
SAFETY
CUT-OUT
RESET
BUTTON
WORKING
THERMOSTAT
TEMP.
ADJUSTMENT
SCREW
SPADE OR RING
CONNECTOR
LESS THAN
10 mm
OSO Hotwater (UK) Limited can not be held
responsible if alternative wiring plans are used.
Important: Before resetting the safety cut-out or
altering the thermostat setting isolate electrical
supply to the unit before removal of the lid.

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S-plan WIRING LAYOUT
R
E
S
E
T
R
E
S
E
T
M2
1
2
3
4
R
E
S
E
T
R
E
S
E
T
M2
1
2
3
4
THERM-O-DISC
1 2
E
231
T6360B
B1BrG O
G/Y
3 5 7
34NL ENL ENL
ST6400 Boiler Pump
321 32 32
2 2 31
V4043H
Zone Valve (DHW)
(supplied)
Thermal Cut Out/Thermostats
(supplied)
Isolated Mains
Supply From
Fused Spur
L N E
Zone Valve (Htg)
(not supplied)
Room
thermostat
6 9
B1BrG O
G/Y
2 31
V4043H
4 8 10
L N
R
E
S
E
T
R
E
S
E
T
M2
1
2
3
4
R
E
S
E
T
R
E
S
E
T
M2
1
2
3
4
THERM-O-DISC
1 2
E
231
T6360B
B1BrG O
G/Y
3 5 7
34NL ENL ENL
ST6400 Boiler Pump
321 32 32
2 2 31
V4043H
Room 'stat Zone Valve (DHW)
(supplied)
Thermal Cut Out/Thermostats
(supplied)
Isolated Mains
Supply From
Fused Spur
L N E
Zone Valve (Htg)
(not supplied)
6 9
B1BrG O
G/Y
2 31
V4043H
4 8 10
L N
Thermistor wire
Connected to
boiler control system
Thermistor
Wiring for
Standard Boiler
Wiring for Thermistor
Controlled Boiler
Pump
flow
2-port valve
(supplied)
Zone valve
(not supplied)
Automatic
bypass
Radiators/
UFH
Boiler
Electricalspareparts:
Immersion Heater 71259
Thermostats 80030
Piping
Diagram
OSO Ecoline cylinders
can be tted with all types of
boilers.
Standard boilers operate using
room and cylinder thermostats.
Please follow upper diagram:
‘Wiring for Standard Boiler’.
Many popular boilers now use a
thermistor principle. A thermistor
temperature sensor is supplied
with the boiler to attach to the
cylinder. Temperature informa-
tion is relayed back to the boiler
control system.
A clip is provided to secure the
sensor on the EcoLine cylinder.
The supplied motorised valve
must be used in accordance with
Building Regulation G3. This is
wired from the thermal cutout on
the cylinder thermostat.
Please follow lower diagram:
‘Wiring for Thermistor Controlled
Boiler’.
Both wiring plans shown is
based on the use of a 10-way
Junction Box (Honeywell Part
no. 42002116-001).
Junction Box terminal 8 is
switched live and, if needed, ter-
minal 10 is pump live.

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Y-plan WIRING LAYOUT
R
E
S
E
T
R
E
S
E
T
M2
1
2
3
4
R
E
S
E
T
R
E
S
E
T
M2
1
2
3
4
THERM-O-DISC
1 2
E
231
T6360B
B1OG Br
G/Y
3
3 14NL ENL ENL
ST6400 Boiler Pump
321 32 32
2 2 31
V4043H
Room
thermostat
Zone Valve (DHW)
(supplied)
Thermal Cut Out/Thermostats
(supplied)
Isolated Mains
Supply From
Fused Spur
L N E
Mid Position Valve
(not supplied)
6
WB1 G/Y Gr O
23
V4073A1039
10
L N
4 5 987
R
E
S
E
T
R
E
S
E
T
M2
1
2
3
4
R
E
S
E
T
R
E
S
E
T
M2
1
2
3
4
THERM-O-DISC
1 2
E
231
T6360B
B1OG Br
G/Y
3
3 14NL ENL ENL
ST6400 Boiler Pump
321 32 32
2 2 31
V4043H
Room
thermostat
Zone Valve (DHW)
(supplied)
Thermal Cut Out/Thermostats
(supplied)
Isolated Mains
Supply From
Fused Spur
L N E
Mid Position Valve
(not supplied)
6
WB1 G/Y Gr O
23
V4073A1039
10
L N
4 5 987
Thermistor wire
Connected to
boiler control system
Thermistor
Wiring for
Standard Boiler
Wiring for Thermistor
Controlled Boiler
OSO Ecoline cylinders
can be tted with all types of
boilers.
Standard boilers operate using
room and cylinder thermostats.
Please follow upper diagram:
‘Wiring for Standard Boiler’.
Many popular boilers now use a
thermistor principle. A thermistor
temperature sensor is supplied
with the boiler to attach to the
cylinder. Temperature informa-
tion is relayed back to the boiler
control system.
A clip is provided to secure the
sensor on the Ecoline cylinder.
The supplied motorised valve
must be used in accordance with
Building Regulation G3. This is
wired from the thermal cutout on
the cylinder thermostat.
Please follow lower diagram:
‘Wiring for Thermistor Controlled
Boiler’.
Y-plan systems with unvent-ed
cylinders require use of both a
mid-position valve and the sup-
plied zone valve. Failure to use
the zone valve contravenes
regulations.
Both wiring plans shown is
based on the use of a 10-way
Junction Box (Honeywell Part
no. 42002116-001).
Junction Box terminal 8 is
switched live and, if needed, ter-
minal 10 is pump live.
Pump
flow
2-port valve
(supplied)
Mid pos. valve
(not supplied)
Radiators/
UFH
Boiler
Automatic
bypass
Electricalspareparts:
Immersion Heater 71259
Thermostats 80030
Piping
Diagram

- 8 -
Pressure reducing valve
1. Isolate the cold water supply and open a
ground oor cold tap.
2. Unscrew the pressure reducing cartridge
3. Clean the lter mesh and the cartridge
under running water.
4. Replace cartridge ensuring that strainer is
correctly located and reassemble the unit.
Pressure Reducing Valve cartridge and
strainer Part No. REDC355030 - 3 Bar.
Expansion relief cartridge
1. Isolate the cold water supply and open a
ground oor cold tap.
2. Unscrew blue expansion relief headwork
from valve body.
3. Clean valve seat face and seating - do not
scratch or damage either seat face or seating.
4. Ret in reverse order. Do not overtighten
Expansion valve cartridge and seat Part
No. 214005 6.0 Bar.
Spare parts
MAINTENANCE
Pressure reducing valve
Cartridge - Part No.
REDC 355030 - 3 bar
Expansion valve
(Cartridge and seat)
Part No. 214005
6.0 Bar
Expansion valve
6.0 Bar - Part No.
PREL355030
Safety Cut-out
1. The safety cut-out operates if:
a. Wiring is incorrect.
b. The immersion heater thermostat or cylinder thermostat fails.
c. Thermostat is set too high.
2. Remember before resetting the safety cut-out or altering the thermostat setting, isolate electrical supply
to the unit prior to removal of the electrical box lid.
3. Reduce thermostat setting and press the reset button. After adjustments are completed, ensure the lid
to the electrical box is replaced correctly and the retaining screw is tted.
4. If still out of operation, contact installer.
It is a condition of the guarantee that annually a competent person:
(a) Inspects and cleans the line strainer.
(b) Checks the operation of the expansion relief valve and temperature & pressure relief valve.
(c) Recommissions the cylinder in accordance with the instructions above.
Corrosion resistance
Stainless steel is naturally corrosion resistant to mains water supply. No specic maintenance is required
to maintain this resistance. Please see guarantee terms for permissable water content. Please note: OSO
cylinders are not guaranteed for use with a private water supply.
The immersion heater can be removed to provide visual inspection access to the cylinder.
Cold or tepid water discharge from tundish - The tundish should be installed away from electrical devices.
1. Close cold water supply valve
2. Open a hot tap.
3. Repressurise the expansion vessel air charge to its set level.
4. Close hot tap
5. Open the cold water supply valve
Hot water discharge from tundish
This indicates a malfunction of a thermal cut-out, operating thermostat or the combined temperature and
pressure relief valve. Turn off the electrical supply to the immersion heater and also isolate an indirect unit
from the boiler. Contact the installer or competent engineer.
SAFETY AND MAINTENANCE
RECOMMISSIONING INSTRUCTIONS
Draining/ushing
1. Turn off mains supply.
2. Connect hose pipe to drain cock at base of cylinder.
3. Open hot tap. Open drain valve and open temperature & pressure relief valve.
4. Allow to drain. Follow commissioning instructions (above) to rell.

- 9 -
OSO FAULT FINDING GUIDE
Note: Disconnect electrical supply before removing any electrical equipment covers
FAULT POSSIBLE CAUSE REMEDY
No water ow from hot
taps
Poor pressure and ow
from taps
Water from hot taps is
cold
Excessive hot water from
taps
-check which heat source
is operating - boiler or
immersion heater
Intermittent water dis-
charge through tundish
when water is being
heated
Continous water discharge
(slow dribble)
Continous water discharge
(fast ow steaming hot
water)
Continous water discharge
(fast ow)
1. Mains supply off
2. Strainer blocked
3. Cold water inlet Pressure
Reducing Valve incorrectly
tted
1. Strainer blocked
2. Poor incoming supply
1. Programmer set to central
heating or not switched on
2. Boiler not working
3. Cylinder thermal cut-out has
operated (indirect units only)
4. Motorised valve not
operating correctly
5. Immersion heaters not
switched on
6. Immersion heater thermal
cut-out has operated
1. Check temperature with
thermometer. Reading
should be 60-65°C
2. Check wiring is correct
3. Thermostat set too high
4. Faulty thermostat
1. Faulty expansion vessel
2. Thermal control failure
(Note: Water will be hot)
1. Expansion relief valve faulty
2. Temperature and Pressure
relief valve is faulty
1. Temperature and Pressure
Relief Valve operated due to
excess temperature
1. Cold water inlet pressure
Reducing Valve not working
1. Check and open stop cock
2. Turn off water supply. Remove strainer
and clean (see Pressure Reducing Valve
page 8)
3. Check and ret as required (see item 3
page 5 of this manual).
1. Turn off water supply. Open cold tap.
Remove strainer and clean (see Press-
ure Reducing Valve page 8 in this
manual)
2. Fit OSO SuperStream system to boost
mains supply
1. Check and set to hot water
2. Check boiler operation. If fault suspected
consult installer or boiler manufacturer
3. Check and swich on
4. Check wiring and/or plumbing connecti-
ons to motorised valve (see pages 8 or 10)
5. Check and switch on
6. Check and reset button (see thermostat
diagram page 9 and safety cut-out on p. 4)
1. If lower temperature is required at taps,
t thermostatic mixing valve
2. Seek advice from electrician
3. Lower temperature at thermostat to 55°C
4. Replace thermostat
1. Repressurize expansion vessel. Follow
recommissioning instructions on page 8.
2. Switch off power to immersion heater(s)
and boiler supply to the unit. When
discharge has stopped, check thermal
controls, replace if faulty. Contact a
competent person
Identify which valve is discharging and
replace
1. Switch off power to immersion heater
and contact competent person
2. If immersion was not switched on,
isolate power to boiler and contact
competent boiler engineer
1. Check pressure from valve, if greater
than 3 bar replace (see page 8)

- 10 -
Repressurize expansion ves-
sel. Follow recommissioning
instructions on page 4.
Reduced
expansion volume
OSO FAULT FINDING GUIDE

- 11 -
OSO FAULT FINDING GUIDE
Hot water from taps is cold
Insufcient hot water
when boiler is used
If problem persists
contact a competent
engineer / plumber

- 12 -
ALTERNATIVE DISCHARGE
SECONDARY RETURN
Downward discharges at low
level, i.e. up to 100 mm above
external surfaces such as car
parks, hard standings, grassed
areas etc, are acceptable pro-
viding that where children may
play or otherwise come into con-
tact with discharges, a wire cage
or similar guard is positioned to
prevent contact, whilst maintain-
ing visibility.
Discharge at high level, i.e. into
a metal hopper and metal
down pipe with the end of the
discharge pipe clearly visible
(tundish visible or not) or onto
a roof capable of withstanding
high temperature discharges of
water and 3 m from any plastics guttering system that would collect such discharges (tundish visible).
Where a single pipe serves a number of discharges, such as in blocks of ats, the number served
should be limited to not more than 6 systems so that any installation discharging can be traced
reasonably easily. The single common discharge pipe should be at least one pipe size larger than
the largest individual discharge pipe to be connected. For further information contact your Building
Control Ofce or The British Board of Agrément.
FIGURE 5
1. Secondary Return Fitting
2. Non Return Valve
3. Circulation Pump
4. Secondary Return Line
5. Hot water draw off to outlets
HOTWATER UK Ltd.
All replacement parts must be supplied by
OSO HOTWATER (UK) LIMITED.
To obtain the address of a local stockist contact:
OSO HOTWATER (UK) LTD.
Endeavor House, Seventh Avenue, Team Valley Trading Estate,
Gateshead, Tyne&Wear, NE11 0EF
FIGURE 4
E-mail: [email protected]•[email protected]•[email protected]
Phone: [phone] • Fax: [phone] • Website: www.osohotwater.co.uk / www.oso-spares.co.uk
This OSO product is approved to building and water regulations by KIWA Watertec Ltd.
Tel: [phone] • Email: [email protected]

- 13 -
The code of practice for the installation,
commissioning & servicing of mains pressure hot water storage
Installation,Commissioning
and Service Record Log Book
CUSTOMER DETAILS
NAME
ADDRESS
TEL No.
IMPORTANT
1. Please, keep the Log Book in a safe place for future reference.
2. This Log Book is to be completed in full by the competent person(s) who
commissioned the equipment and then handed to the customer. When this is done,
the Log Book is a commissioning certicate that can be accepted as evidence of
compliance with the appropriate Building Regulations.
3. Failure to install and commission this appliance to the manufacturer’s
instructions may invalidate the guarantee.
The above does not affect your statutory rights.
For full details on the HWA charter please visit http://www.hotwater.org.uk/
© HEATING AND HOTWATER INFORMATION COUNCIL
IT IS THE RESPONSIBILITY OF THE INSTALLER TO COMPLETE THIS
LOG BOOK AND PASS IT ON TO THE CUSTOMER. FAILURE TO DO
SO MAY INVALIDATE THE CYLINDER GUARANTEE
HWA charter members agree to:
• To supply t for purpose products clearly and honestly described
• To supply products that meet, or exceed appropriate standards and building and water regulations
• To provide pre and post sales technical support
• To provide clear and concise warranty details to customers

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INSTALLER & COMMISSIONING ENGINEER DETAILS
INSTALLER DETAILS
COMPANY NAME DATE
ADDRESS
INSTALLER NAME TEL No.
REGISTERED OPERATIVE ID CARD No.
(IF APPLICABLE)
REGISTRATION DETAILS
COMMISSIONING ENGINEER (IF DIFFERENT)
NAME DATE
ADDRESS
TEL No.
REGISTERED OPERATIVE ID CARD No.
(IF APPLICABLE)
REGISTRATION DETAILS
GUARANTEE - OSO UNVENTED HOTWATER CYLINDER
IT IS THE RESPONSIBILITY OF THE INSTALLER TO COMPLETE THIS LOGBOOK AND PASS IT
ON TO THE CUSTOMER. FAILURE TO DO SO MAY INVALIDATE THE CYLINDER GUARANTEE
The OSO stainless steel inner vessel is guaranteed against material defect or manufacturing faults for a period of 25 years from the
date of purchase. All other parts including, but not limited to factory tted electrical elements (damage caused by lime scale excluded),
expansion vessel, thermostats and valves are guaranteed against material defects or manufacturing faults for 2 years from the date
of purchase. In the event of a replacement component being required OSO Hotwater will supply such part(s) free of charge and
freight paid, on condition that the defective component is delivered, freight paid to OSO Hotwater within 2 weeks of written notice
being given to OSO Hotwater of the defect. Such replacement parts shall be guaranteed under the terms of this guarantee to the
unexpired period of the aforementioned 2 year period.
This warranty is conditional upon the OSO cylinder being installed in compliance with the OSO Installation & Maintenace Instructions, all
current legislation, codes of practice and regulations governing the installation of unvented hot water cylinders in force at the date of instal-
lation and provided that:
1. The water quality shall be in accordance with European Council Directive 98/83 EC, or revised version at the date of installation,
and is not fed with water from a private supply.
Particular: Chloride content: Max. 250 mg/l
Sulphate content: Max. 250 mg/l
Combination Chloride/sulphate: Max. 300 mg/l (in total)
2. The OSO cylinder is lled with water before turning the electricity supply on to the heater elements.
3. The log book certicate is completed at the time of installation.
4. The OSO cylinder is serviced and maintained every 12 months and is marked as such in the logbook provided with the cylinder.
Invoices for the maintenance work should be kept as proof of regular maintenance. Care should be taken of the logbook and
invoices as they serve as the guarantee certicate for the cylinder.
5. If the newly tted water heater is not in regular use then it must be ushed through with fresh water for at least 15 minutes.
Open at least one hot water tap once per week, during a period of at least 4 weeks.
6. The OSO unvented cylinder has not been modied in any way other than by OSO Hotwater and is only used for the storage
of potable water.
7. No factory tted parts have been removed for unauthorised repair or replacement.
8. Defects caused by frost, excess pressure, salt dehardner process, transient voltage, lightning strikes or incorrect installation,
repair or use, are not covered by this warranty. A laboratory evaluation of possible defects can be ordered by the user,
however the user must pay for this where the above mentioned conditions have not been fullled. Evidence of the purchase
date and the date of supply must also be submitted with your claim.
This guarantee does not confer any rights other than those expressly set out above and does not cover any claims for consequential loss
or damage. This guarantee is offered as an extra benet and does not affect your statutory rights as a consumer.

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APPLIANCE & TIME CONTROL DETAILS
MANUFACTURER OSO HOTWATER (UK) MODEL
CAPACITY
TYPE
TIME CONTROL
UNVENTED
PROGRAMMER
litres SERIAL No.
TIME SWITCH
or
COMMISSIONING PROCEDURE INFORMATION
BOILER PRIMARY SETTINGS (INDIRECT HEATING ONLY) ALL BOILERS
IS THE PRIMARY A SEALED OR OPEN VENTED SYSTEM? SEALED OPEN
WHAT IS THE BOILER FLOW TEMPERATURE? C
ALL MAINS PRESSURISED SYSTEMS
YES
WHAT IS INCOMING STATIC COLD WATER PRESSURE AT THE INLET TO THE
PRESSURE REDUCING VALVE?
HAS STRAINER (IF FITTED) BEEN CLEANED OF INSTALLATION DEBRIS?
HAS A WATER SCALE REDUCER BEEN FITTED?
WHAT TYPE OF SCALE REDUCER HAS BEEN FITTED?
NO
YES NO
UNVENTED SYSTEMS
YES
ARE COMBINED TEMPERATURE AND PRESSURE RELIEF VALVE
AND EXPANSION VALVE FITTED AND DISCHARGE TESTED?
IS PRIMARY ENERGY SOURCE CUT OUT FITTED
(NORMALLY 2 PORT VALVE)?
WHAT IS THE PRESSURE REDUCING VALVE SETTING (IF FITTED)?
WHERE IS OPERATING PRESSURE REDUCING VALVE SITUATED?
NO
YES NO
YES NO
bar
HAS THE EXPANSION VESSEL OR INTERNAL AIR SPACE BEEN CHECKED? YES NO
WHAT IS THE HOT WATER TEMPERATURE AT THE NEAREST OUTLET? C
bar
ALL PRODUCTS
YES
DOES THE HOT WATER SYSTEM COMPLY WITH
THE APPROPRIATE BUILDING REGULATIONS?
HAS THE SYSTEM BEEN INSTALLED AND COMMISSIONED
IN ACCORDANCE WITH THE MANUFACTURER’S INSTRUCTIONS?
HAVE YOU DEMONSTRATED THE OPERATION OF THE
SYSTEM CONTROLS TO THE CUSTOMER? YES
YES
HAVE YOU LEFT ALL THE MANUFACTURER’S
LITERATURE WITH THE CUSTOMER? YES
COMPETENT PERSON’S
SIGNATURE
CUSTOMER’S
SIGNATURE
(To conrm demonstrations of equipment and
receipt of appliance instructions)
PLEASE FOLLOW THE INSTALLATION AND COMMISSIONING INSTRUCTIONS
IN THE INSTALLATION MANUAL SUPPLIED WITH THE EQUIPMENT

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SERVICE INTERVAL RECORD
SERVICE PROVIDER
It is recommended that your hot water system is serviced regularly and that your service
engineer completes the appropriate Service Interval Record below.
Before completing the appropriate Service Interval Record below, please ensure
you have carried out the service as described in the manufacturer’s instructions
and in compliance with all relevant codes of practice.
ENGINEER NAME
SERVICE 1
COMPANY NAME
TEL No.
COMMENTS
SIGNATURE
DATE:
ENGINEER NAME
SERVICE 3
COMPANY NAME
TEL No.
COMMENTS
SIGNATURE
DATE:
ENGINEER NAME
SERVICE 5
COMPANY NAME
TEL No.
COMMENTS
SIGNATURE
DATE:
ENGINEER NAME
SERVICE 7
COMPANY NAME
TEL No.
COMMENTS
SIGNATURE
DATE:
ENGINEER NAME
SERVICE 9
COMPANY NAME
TEL No.
COMMENTS
SIGNATURE
DATE:
ENGINEER NAME
SERVICE 2
COMPANY NAME
TEL No.
COMMENTS
SIGNATURE
DATE:
ENGINEER NAME
SERVICE 4
COMPANY NAME
TEL No.
COMMENTS
SIGNATURE
DATE:
ENGINEER NAME
SERVICE 6
COMPANY NAME
TEL No.
COMMENTS
SIGNATURE
DATE:
ENGINEER NAME
SERVICE 8
COMPANY NAME
TEL No.
COMMENTS
SIGNATURE
DATE:
ENGINEER NAME
SERVICE 10
COMPANY NAME
TEL No.
COMMENTS
SIGNATURE
DATE:
When all the above services have been completed, please contact your Service Engineer for an additional service interval record sheet.
HWSLB First Edition 01.03.02 - OSO-nr. 00142052-03