OSO HOTWATER Nano - N 5 User manual

146007-09 - 10-2021
Manufactured by OSO Hotwater AS
Industriveien 1 - 3300 Hokksund - Norway
Tel: + 47 32 25 00 00 / Fax: + 47 32 25 00 90
E-mail: [email protected] / www.osohotwater.com
Nano - N
5 l.
EN
SAFETY INFORMATION
O&M INFORMATION
INSTALLATION MANUAL
TDS - TECHNICAL DATA SHEET

2
CONTENTS
1. Safety instructions................................................ 3
1.1 General information..................................... 3
1.2 Safety instructions for users..................... 4
1.3 Safety instructions for installers............. 4
2. Product description ............................................. 5
2.1. Product identification.................................. 5
2.2. Intended use ................................................... 5
2.3 CE marking....................................................... 5
2.4 Technical data.................................................. 5
2.5. ErP data (TDS).................................................. 5
3. Installation instructions..................................... 6
3.1. Products covered by these
instructions........................................................ 6
3.2. Included in delivery....................................... 6
3.3. Product dimensions ..................................... 6
3.4. Requirements for installation
location .............................................................. 7
3.5. Pipe installation............................................... 8
3.6. Electrical installation................................... 10
4. Initial commissioning ......................................... 12
4.1. Filling with water.......................................... 12
4.2. Turning on the power ............................... 12
4.3. Control points................................................ 12
4.4. Emptying of water....................................... 12
4.5. Handover to end-user............................... 12
5. User Guide................................................................ 13
5.1. Settings.............................................................. 13
5.2. Maintenance................................................... 13
6. Troubleshooting................................................... 14
6.1. Faults and fixes.............................................. 14
7. Warranty conditions.......................................... 15
7.1. Warranty and registration....................... 15
7.2. Customer service.......................................... 15
8. Removing the product..................................... 15
8.1. Removal............................................................ 15
8.2. Returns scheme............................................ 15

3
1. SAFETY INSTRUCTIONS
1.1 General information
•Read the following safety instructions
carefully before installing, maintaining or
adjusting the water heater.
•Personal injury or material damage may
result if the product is not installed or
used in the intended manner.
•Keep this manual and other relevant doc-
uments where they are accessible for fu-
ture reference.
•The manufacturer assumes compliance
(by the end-user) with the safety, oper-
ating and maintenance instructions sup-
plied and (by the installer) with the fitting
manual and relevant standards and regu-
lations in effect at the date of installation.
Symbols used in this manual:
!
WARNING Could cause serious injury or death
!
CAUTION Could cause minor or moderate injury or damage to property
DO NOT
!
DO
!
This document should be kept in a suitable place where it is accessible for future reference.
!

4
1.3 Safety instructions for installers
!
WARNING
The overflow from the safety valve must NOT be sealed or plugged.
Fitting an external control unit managing the power supply to the product is NOT allowed
without approval from the manufacturer.
!
Any overflow pipe from the safety valve MUST be >1/2 mm inside, clear, undamaged and
frost-free with a fall to the drain.
!
Fixed electric fittings shall be used for installation in new homes or when changing an
existing electrical setup in accordance with regulations.
!
The mains cable shall withstand 90°C. A strain reliever must be fitted.
!
The product shall be filled with water before the power is switched on.
!
The relevant regulations and standards, and this installation manual, must be followed.
1.2 Safety instructions for users
!
WARNING
The overflow from the safety valve must NOT be sealed or plugged.
The product must NOT be covered over the cover on the front.
The product must NOT be modified or changed from its original state.
Fitting an external control unit managing the power supply to the product is NOT allowed
without approval from the manufacturer.
Children must NOT play with the product or go near it without supervision.
!
The product shall be filled with water before the power is switched on.
!
Maintenance/settings shall only be carried out by persons over 18 years of age, with sufficient
understanding
!
CAUTION
The product must not be exposed to frost, over-pressure, over-voltage or chlorine treatment.
See warranty provisions.
Maintenance/settings shall not be carried out by persons of diminished physical or mental
capacity, unless they have been instructed in the correct use by someone responsible for their
safety.
!
CAUTION
!
The product shall be fitted in accordance with Part G3 of building regulations.
Liability for consequential damage will only apply if this is followed.
!
The product shall be properly aligned vertically and horizontally, on a floor or wall suitable for
the total weight of the product when in operation. See type plate.
!
The product shall be mounted to allow access to the junction box when needed.

5
2.4 Technical data
NRF no. Product code: Capacity
persons Weight kg. WxDxH mm. Freight vol. m³ IP class Heating time hours Dt 65°C Heat loss W
1080 6051 N 5 - 2.8 kW 1x230V 0.5 12 200x234x500 0.03 IP44 0.1 13
2.5 ErP data - Technical Data Sheet
Brand Model-no. Model name Tap
profile
ErP
Rating
Energy
eff. % AEC - kWh/a
Thermo-
stat set-
ting °C
Volume
40°C
water
OSO Hotwater AS 1080 6051 Nano - N 5 - 2.8 kW 1x230V XXS A 35 525 60 7
Directive: 2010/30/EU Regulation: EU 812/2013 Directive: 2009/125/EC Regulation: EU 814/2013
Efficiency-tested according to standard: EN 50440: 2015
2. PRODUCT DESCRIPTION
2.1 Product identification
Identification details for your product can be found
on the type plate fixed to the product. The type
plate contains details of the product in accordance
with EN 12897:2016 and EN 60335-2-21, as well as
other useful data. See Declaration of Conformity at
www.osohotwater.co.uk for more information.
OSO products are designed and manufactured in
accordance with:
• Pressure vessel standard EN 12897:2016
• Safety standard EN 60335-2-21
• Welding standard EN ISO 3834-2
OSO Hotwater AS is certified for
• Quality ISO 9001
• Environment ISO 14001
• Work environment ISO 45001
2.2 Intended use
The Nano is designed to supply homes with hot
water, and to reheat water where there are long
lengths of pipe etc.
The product is designed to be mounted on a wall
2.3 UKCA marking
The UKCA mark shows that the product complies
with the relevant Directives. See Declaration of
Conformity at www.osohotwater.co.uk for more
information.
The product complies with Directives for:
• Low voltage LVD 2014/35/EU
• Electromagnetic compatibility EMC 2014/30/EU
•
Pressurised Equipment Directive PED 2014/68/EU
Any safety valve(s) used should be CE-marked
and comply with the PED 2014/68/EU.

6
3.3 Product dimensions
3.3.1 Delivery
The product shall be transported carefully, with
packaging.
3.3.2 Removing the insulation
The product is fitted with a four-port insulation
cap with quick-fit locks that can easily be pulled
apart and put together without the use of tools.
Care should be taken when fitting/dismantling to
ensure that the locking mechanisms and insula-
tion are not damaged.
Removing the insulation cap:
1. Pull one of the wedge-shaped end pieces
out by gripping it with your fingers in the
recess by the pipe joint; see illustration. (K).
2. Repeat with the end piece at the opposite
end.
3. Pull off the front piece by gripping the edges
and pulling straight out. Inner tank and junc-
tion box with screw holes for wall fittiing are
now accessible.
Fitting the insulation cap:
1. Press the front piece into the fasteners.
2. Press the two end pieces into place. Ensure
that the locking mechanisms slide into each
other correctly and that the coloured rings
(red/blue) indicating HW and CW are posi-
tioned correctly in the slots.
IMPORTANT: If the insulation is not correctly and
Product. AB C
N 5 200 234 500
Tolerance +/- 5 mm.
3. INSTALLATION INSTRUCTIONS
3.1 Products covered by these instructions
800 0051 Nano - N 5
3.2 Included in delivery
Ref no. Num-
ber of Description
1 1 Thermostat
2 1 Heating element
3 1 Installation manual (this document)
4 1 Mounting band with 2 screws + washers
5 1 Water heater
6 1 Safety valve (supplied loose)
All dimensions in mm.
C
B A
3
4
5
6
1
2
!
WARNING
Before any work is done, the power supply must
be disconnected and secured against activation
while the work is in progress.
K

7
3.4 Requirements for installation location and positioning
!
CAUTION
!
The product shall be fitted in accordance with Part G3 of building regulations.
Liability for consequential damage will only apply if this is followed.
!
The safety valve supplied must be mounted on the cold water supply to the boiler. See
section 3.5.2.
!
The product shall be placed in a dry and permanently frost-free position.
!
The product shall be mounted on a wall suitable for the total weight of the product in operation.
!
If the product is fitted horizontally, the pipe connectors must point straight up. It is
recommended that the product be screwed tight to the wall or a suitable surface regard-
less of the method chosen; use the screw holes (D).
If the product is fitted vertically, the electric box must face upwards. See page 8.
!
The product shall be mounted to allow access to the junction box when needed. Mains cable
can be placed in the channels in the back of the product. Mains cable for wall socket should be
laid where it is not exposed to any mechanical or chemical influence.
!
The product shall be easily accessible in the home for servicing and maintenance.
completely fitted, the product will not achieve
the specified ErP energy rating. The energy con-
sumption of the product could increase.
3.3.3 Wall fitting
The product is designed to be mounted on a wall.
When the insulation cap is removed, there is easy
access to the screw holes (D).
The Nano is attached to the wall with the sup-
plied fastening metal band (V); see illustration.
The metal band is bent/placed around the mid-
dle of the tank and fixed to the wall through the
holes in the insulation, using the screws/washers
supplied. Ensure that the connectors do not press
on the insulation parts. Use a torx type bit (T25).
Tighten the screws until the insulation around the
screw holes deforms slightly.
3.3.4 Reversing the inner tank
For horizontal mounting, the inner tank can be
reversed if it is desirable to swap the CW and HW
connections for ease of fitting. Important: This
can only be done when the electricity is not con-
nected.
1. Remove the insulation (see 3.3.2).
2. Remove the electrical cover by loosening
the nut (E). Then unscrew the strain reliever
for the mains cable (F) and remove the elec-
trical cover.
3. The electrical cover (I) may be modified by
opening the alternative fixing for the strain
reliever (K). Material in the recess should be
removed and the strain reliever with cable
E
H
H
K
F
J
G
I
fitted into the new channel.
4. Remove the fastening band (V). Pull the tank
out so the connections clear the attachment
points (H). Turn the tank 180° and push it
back into the attachment points. Refit the
fastening band.
5. Ensure that connections and the coloured
rings (red/blue) indicating HW and CW are
positioned correctly in the slots.
6. Fit the electrical cover with the nut (E), then
fit the insulation cap. The end-parts of the
insulation must now swap places.
7. The product has built-in channels in the
back (J) for simple and tidy routing of the
mains cable at the back of the product.
D
V
D
C-C
174 mm

8
Product. CW (1) HW (2) Overflow (4)
N 5 ø15 mm ø15 mm 1/2" outside thread
3.5.3 Torque settings
3.5 Pipe installation
3.5.1 Incoming water pressure
The efficiency of the product depends on the in-
coming cold water pressure. The water pressure
should be min. 2 bar and max. 6 bar throughout
the day. Excessive water pressure can be adjusted
by installing a pressure reduction valve.
3.5.2 Fitting cold and hot water pipes (CW-HW),
safety valve and overflow pipe
A) Place product in the desired position. If the
product is fitted horizontally, the pipe connec-
tors must point straight up. It is recommended
that the product is secured to a wall or a suitable
surface regardless of the method chosen; use
the screw holes D, see page 7.
If the product is fitted vertically, the electric box
MUST face upwards. See pt. 3.5.7.
B) CW (1)/HW (2) fit pipes of suitable size
to the connections, tighten according to
table 3.5.3.
• For larger pipe sizes, a reducer can
be used.
C) The safety valve supplied (3) must
be fitted to the incoming CW supply pipe.
D) Any overflow pipe (5) >1/2" inside should be
run to the overflow on the safety valve (4);
• Connect to 1/2" outside thread. Ring clamp
connector may be used (not included)
• Clear, undamaged and frost-free with
a fall to the drain.
The product is designed to be permanently con-
nected to the mains water supply. Approved pipes
of the correct size should be used for installation.
The relevant standards and regulations must be
followed.
* Fastening band for wall mounting fitted as de-
scribed in section 3.3.3. Screws for wall mounting
tightened until the insulation material starts to de-
form slightly.
The product must be fitted to a wall surface de-
signed to withstand the weight of the product in
operation.
Component Torque
Connection to CW/HW (ø15) 40 Nm (+/- 3)
Ring clamp connection to safety valve 40 Nm (+/- 3)
Screws for mounting band
Depending on
surface*
5
5
4
3
3
1
2
3
1
2

9
3.5.5 Installation instructions
RECOMMENDATION
!
The safety valve supplied must be fitted to the incoming cold water supply pipe. See sec-
tion 3.5.2.
-If a non-return valve is fitted a reduction valve and expansion vessel shall be fitted to avoid
dripping from the safety valve overflow.
-If the maximum water pressure exceeds 6 bar in a 24-hour period, a reduction valve and expansion
vessel shall be fitted.
3.5.6 Installation recommendation
!
WARNING
!
The product shall be filled with water before the power is switched on.
!
Any overflow pipe from the safety valve MUST be >1/2 mm inside, clear, undamaged and
frost-free with a fall to the drain.
!
CAUTION
!
Fixed electric fittings shall be used for installation in new homes or when changing an
existing electrical setup in accordance with regulations.
!
The product shall be properly aligned vertically and horizontally, on a wall or floor suitable for
the total weight of the product when in operation. See type plate.
!
If the product is fitted horizontally, the pipe connectors must point straight up.
It is recommended that the product is fastened to a wall or suitable surface regardless of
the method chosen; use the screw holes D, see page 7.
If the product is fitted vertically, the electric box must face upwards. See illustration below.
!
The product shall be mounted in a way that allows access to the junction box when needed.
3.5.7 Installation positions
√
√
√
X
X X X
X

10
3.6.4 Torque settings
!
WARNING
Constant voltage present at terminals R and S.
Before any electrical work is done, the power
supply must be disconnected and secured
against activation while the work is in progress.
Component Torque
1” heating element 60 Nm (+/- 5)
Thermostat screws 2 Nm (+/- 0.1)
Screw on the element head 2 Nm (+/- 0.1)
A) Blue wire (L) – Neutral – connected to point ‘1’
on the safety thermostat.
B) Brown wire (N) – Live – connected to point ‘3’
on the safety thermostat.
C) Yellow wire with green stripe – Earth – con-
nected to the earth terminal on the attachment
for the thermostat.
D) Internal wires from the element to the thermo-
stat are connected to point ‘4’ on the safety
thermostat and point ‘2’ on the work thermo-
stat. See illustration.
3.6.3 Changing the capacity
The capacity of the element can be halved to 1.5
kW by removing the jumpers (5) connecting the
two heating pipes on the element The product
can then be connected to a 10A fuse. Must be per-
formed by an authorized electrician.
3.6 Electrical installation
3.6.1 Electrical components
Component Note
Safety thermostat 85°C thermal cut-out
Work thermostat 40-70°C adjustable
Heating element 1-phase 230 V
Mains cable with plug Heat-resistant
Internal wires Heat-resistant
Fixed electric fittings shall be used for installa-
tion in new homes or when changing an existing
electrical setup in accordance with regulations. A
mains cable with plug for wall socket can be used
when replacing the product without changing the
electrical setup. Any fixed electric fittings must be
installed by an authorised electrician.
Fitting or retrofitting an external power supply
control unit to the product or its power supply
must only be performed by an authorized elec-
trician. The control unit must be approved by the
product manufacturer.
The relevant standards and regulations must be
followed.
3.6.2 Electrical connections in the junction box
Electrical connection, diagram
R
E
S
E
T
R
E
S
E
T
M2
1
2
3
4
THERM-O-DISC
40°C70°C
60°C 50°C
1
2
L N
5
5

11
RECOMMENDATION
-The mains cable supplied shall be used with fixed electric fittings.
-Mains cable for wall socket shall be laid where it is not exposed to harmful contact.
-
For products with ≤ 3kW capacity, The unit must be permanently connected to a 20amp DP
Switch ( BS3455) with minimum 3mm separation and 2.5mm Flexible Cable HR to 85c (HOFR
to BS 6141 Table 8), installation shall comply with current IEE Regulations. Immersion Heater
rating is 230V x 3kW. All internal wiring is factory fitted.
3.6.5 Installation instructions
3.6.6 Fitting recommendation
!
WARNING
Fitting an external control unit managing the power supply to the product is NOT allowed
without approval from the manufacturer.
!
The product shall be filled with water before the power is switched on.
!
Fixed electric fittings shall be used for installation in new homes or when changing an existing
electrical setup in accordance with regulations.
!
The mains cable shall withstand 90°C. A strain reliever must be fitted.
!
CAUTION
!
The product must have a clearance for servicing of 40 cm in front and side.

12
4.1 Filling with water
First check that all pipes are connected correctly.
Then proceed as follows:
A) Open a hot tap – leave it open
B) Open the cold water supply to the product.
Check that the water from the open hot water tap
is flowing freely, without any bubbles or air locks.
A) Close hot tap.
4.2 Turning on the power
When the cylinder has been filled with water, the
power can be switched on.
A) Insert plug into specified wall socket or turn on
switch/breaker.
4.3 Control points
A) Check that all pipe connections to/from the
product are tight and not leaking.
B) Check that the power supply to the product is
not at risk of exposure to mechanical, thermal
or chemical damage, and is not connected to
a non approved power supply control unit.
C) Check that any overflow pipe from the safe-
ty valve is uninterruptable, undamaged and
frost-free with a fall to the drain.
D) Check that the product is standing firmly verti-
cally and horizontally.
4.5 Handover to end-user
4. INITIAL COMMISSIONING
THE INSTALLER MUST:
Brief the end-user on safety and maintenance
instructions.
Brief the end-user on settings and emptying the
product.
Hand this installation manual over to the end-
user.
Enter contact details on the type plate on the
product.
!
WARNING
The water temperature in the product may exceed
75°C and could cause scalding. Before emptying,
a hot tap should be opened to the max. pressure/
temperature for min. 3 minutes.
A) Disconnect the power supply.
B) Shut off incoming cold water supply.
C) Disconnect the pipe connections to the cold
and hot water feeds on the product.
D) Remove the insulation cap and loosen the wall
mounting band.
E) Bring the heater to a drain, sink or other suit-
able place and empty the tank by turning the
pipe connections upside down. Keep in mind-
that both the water and the product may be
very hot.
When the heater is to be put into operation
again, it must be filled with water and the tank
4.4 Emptying of water
vented by opening a hot water tap to the maxi-
mum pressure until the water flows in an even
stream. The power supply must not be switched
on until this is done. Check that the pipe connec-
tions for CW and HW are still tight and not leak-
ing after 3-4 hours of operation.

13
!
WARNING
Constant voltage present in the junction box. Be-
fore any electrical work is done, the power supply
must be disconnected and secured against activa-
tion while the work is in progress.
5.2 Maintenance
5.1 Settings
5.1.1 Thermostat setting
The thermostat on the product is adjustable from
40-70°C. The thermostat should not be set lower
than 60°C to prevent bacteria growth. To adjust
the temperature:
A) Disconnect the power supply.
B) Dismantle the electrical cover on the heater by
removing the insulation cap (see section 3.3.4)
and then unscrew the cover with a suitable tool.
C) Adjust the temperature on the thermostat (7)
with a screwdriver.
Fit electrical cover and insulation before the power
supply is connected.
5. USER GUIDE
MAINTENANCE INSTRUCTIONS
!
Maintenance shall be carried out by persons over 18 years of age, with sufficient
understanding.
!
Annual inspection of safety valve:
-Open valve for 1 min. by turning the knob (2) approx. 90 degrees to the open
position.
-Visually check that the water is flowing freely to the drain.
-YES = OK. Close the valve by turning the knob (2) a further 90 degrees to the
closed position.
-NO = NOT OK. Disconnect power supply / shut off water supply. Contact in-
staller.
2
R
E
S
E
T
R
E
S
E
T
M2
1
2
3
4
THERM-O-DISC
40°C70°C
60°C 50°C
1
2
7
6
!
WARNING
Changing the temperature setting on the ther-
mostat will change the temperature of the wa-
ter at the tap, and may carry a risk of scalding.
Where necessary, a mixer valve should be fitted
(not included).
5.1.2 Resetting the safety thermostat
The safety thermostat on the product cuts out
when there is a risk of overheating. This is reset by
removing the cover (see 5.1 A and B) and pressing
the red ‘RESET’ button (6). If the thermostat cuts
out repeatedly, contact the installer.

14
6.1 Faults and fixes
If problems arise when the product is in use,
check for possible faults and fixes in the table. If
the problem is not shown in the troubleshoot-
6. TROUBLESHOOTING
ing table or you are unsure what is wrong, con-
tact the installer (see type plate on the product)
or OSO Hotwater AS - see section 7.1.
TROUBLESHOOTING
Problem Possible cause of fault Possible solution
There is leakage/dripping
from the safety valve/
there is often water on the
floor by the cylinder in the
morning
Pressure reduction valve, water meter
or blocked non-return valve on the
water intake.
Water pressure into the home is too
high.
Fit AX expansion vessel with absorbs ex-
pansion during heating, and fit pressure
reduction valve for stable water pressure
inside the home. The pressure reduction
valve is adjusted in according to the pres-
sure in the expansion vessel. Contact auth.
installer.
The safety valve is worn or there are
particles stuck between the mem-
brane and the valve seat because the
water is dirty
Flush with water through the safety valve.
Open valve for approx. 1 minute. See sec-
tion 5.2. If the valve still leaks, it must be
replaced. Contact auth. installer.
Leak from heating element.
Verify as follows: a) cut the electric sup-
ply, b) unscrew the cover, c) visually check
whether there is a leak from the heating
element. If so, replace the gasket/heating
element. Contact auth. installer.
No hot water
Power supply interrupted. Verify that the fuse is on / the plug is plugged in to the wall contact / the earth
breaker has not tripped.
Thermostat has cut out. Press the ‘RESET’ button on the safety ther-
mostat; see ‘User guide’.
Heating element is defective. Replace heating element. Contact auth.
installer.
Leak in hot water pipe Check the hot water pipes and taps in the house for leaks. If a leak is detected: Con-
tact auth. installer.
Not enough hot water High consumption in the home.
Raise the temperature on the thermostat
to the maximum; see ‘User guide’.
Switch to a larger OSO water heater. Con-
tact auth. installer.
Not high enough tem-
perature
The thermostat is set for low tempera-
tures. Raise the temperature on the thermostat to the maximum; see ‘User guide’.
Change from cold to hot water in taps. Contact auth. installer.
Fuse/earth breaker trips
repeatedly Possible fault in the heater’s electrical system.
Verify as follows: a) cut the electric supply,
b) unscrew the cover, c) visually check the
junction box for any problems. If so, con-
tact auth. installer to check. Fit the cover.
Knocking in the pipes
when the hot tap is closed Large pressure increase when the tap is closed quickly. Completely normal. Fit AX expansion ves- sel if troublesome. Contact auth. installer.

15
7.1 Customer service
In case of problems that cannot be resolved
with the aid of the troubleshooting guide in
this installation manual, contact either:
7. WARRANTY CONDITIONS - applies to UK only
8. REMOVING THE PRODUCT
8.1 Removal
A) Disconnect the power supply.
B) Shut off incoming cold water supply.
C) Empty the product of water – see section 4.4.
D) Disconnect all pipes.
E) The product can now be removed.
1. Scope
OSO Hotwater UK Ltd. (hereinafter called OSO) warrants for 2 years
from the date of purchase, that the Product will: i) conform to OSO
specication, ii) be free from defects in materials and workmanship,
subject to conditions below. All components carry a 2-year warranty.
The warranty is voluntarily extended by OSO to 25 years for the
stainless steel inner tank. This extended warranty only applies to
Products purchased by a consumer, that has been installed for private
use and that has been distributed by OSO or by a distributor where the
Products have been originally sold by OSO.
The extended warranty does not apply to Products purchased by
commercial entities or for Products that have been installed for
commercial use. These shall be subject only to the mandatory
provisions of the law. The conditions and limitations set out below
shall apply.
2. Coverage
If a defect arises and a valid claim is received within the statutory
warranty period, at its option and to the extent permitted by law, OSO
shall either; i) repair the defect, or; ii) replace the product with a product
that is identical or similar in function, or; iii) refund the purchase price.
If a defect arises and a valid claim is received after the statutory
warranty period has expired, but within the extended warranty period,
OSO will supply a product that is identical or similar in function. OSO
will in such cases not cover any other associated costs. In addition,
for every year after the statutory warranty period, the claimant must
contribute 4 % of the list price of the cylinder in question to OSO.
Any exchanged Product or component will become the legal property
of OSO. Any valid claim or service does not extend the original warranty.
The replacement Product or part does not carry a new warranty.
3. Conditions
The Product is manufactured to suit most public water supplies.
However, there are certain water chemistries (outlined below) that
can have a detrimental eect on the Product and its life expectancy. If
there are uncertainties regarding water quality, the local water supply
authority can supply the necessary data.
The warranty applies only if the conditions set out below are met in full:
•The Product has been installed by a professional installer, in
accordance with the instructions in the installation manual and
all relevant Codes of Practice and Regulations in force at the
time of installation.
•The Product has not been modied in any way, tampered with
or subjected to misuse and no factory tted parts have been
removed for unauthorized repair or replacement.
•The product has been connected to the public power grid and
it has not been connected to an external power supply control
unit not approved by OSO.
•The Product has only been connected to a domestic mains
water supply in compliance with the European Drinking Water
Directive EN 98/83 EC, or latest version. The water should not
be aggressive, i.e. the water chemistry shall comply with the
following:
- Chloride < 250 mg / L
- Electric Conductivity (EC) @25°C < 750 uS / cm
-Saturation Index (LSI) @80°C > - 1,0 / < 0,8
- pH level > 6,0 / < 9,5
•The immersion heater has not been exposed to hardness
levels exceeding 5°dH (180 ppm CaCO3). A water softener is
recommended in such cases.
•Any disinfection has been carried out without aecting the
Product in any way whatsoever. The Product shall be isolated
from any system chlorination.
•The Product has been in regular use from the date of
installation. If the Product is not intended to be used for 60 days
or more, it must be drained.
•The immersion heater element must be removed for inspection
on service after 5 years. The threads must be checked for
corrosion. If signs of corrosion are evident, the element must
be replaced. Subsequently the element must be removed and
examined every 3 years. Failure to do so in areas of aggressive
water may result in the element separating from the cylinder
with consequential escape of water.
•Service and/or repair shall be done according to the installation
manual and all relevant codes of practice. Any replacement
parts used shall be original OSO spare parts.
•The Service record / Benchmark logbook has been completed
and updated after each annual service. Invoices should be kept
as proof of service.
•The Commissioning Checklist / Benchmark certicate has
been completed at the time of installation.
•Any third-party costs associated with any claim has been
authorized in advance by OSO in writing.
•The purchase invoice and/or installation invoice, a water
sample as well as the defective product is made available to
OSO upon request.
Failure to follow these instructions and conditions may result in
product failure, and water escaping from the Product.
4. Limitations
The warranty does not cover:
•Any fault or costs arising from incorrect installation, incorrect
application, lack of regular maintenance in accordance with the
installation manual, neglect, accidental or malicious damage,
misuse, any alteration, tampering or repair carried out by a
non-professional, any fault arising from the tampering with or
removal of any factory tted safety components or measures.
•Any consequential damage or any indirect loss caused by any
failure or malfunction of the Product whatsoever.
•Any pipework or any equipment connected to the Product.
•The eects of frost, lightning, voltage variation, lack of water,
connecting to a non approved external power supply control
unit, dry boiling, excess pressure or chlorination procedures.
•The eects of stagnant (de-aerated) water if the Product has
been left unused for more than 60 days consecutively.
•Damage caused during transportation. Buyer shall give the
carrier notice of such damage.
•Costs arising if the Product is not immediately accessible for
servicing.
These warranties do not aect the Buyer’s statutory rights.
8.2 Returns scheme
This product is recyclable and should be taken
to the environmental recycling centre. If the
product is to be replaced with a new one, the
installer can take the old cylinder away for re-
cycling.
A) The installer who supplied the product.
B) OSO Hotwater AS: Tel.: [phone]
[email protected] / www.oso.no

OSO Hotwater AS
Industriveien 1
3300 Hokksund - Norway
Tel: + 47 32 25 00 00
[email protected]
www.osohotwater.com
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