OSO TERMO PLUS-M User manual

TERMO ELECTRIC BOILERS
MANUAL
OSO TERMO RS -M
OSO TERMO PLUS - M
OSO TERMO PTV – M
B C

INSTRUCTIONS FOR INSTALLATION
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Contents
1. Introduction ....................................................................................................................... 1
1.1. A licable documents................................................................................................. 1
1.2. Retention of documents .............................................................................................. 1
1.3. Features & benefits..................................................................................................... 1
1.4. O eration of domestic hot water (where a licable).................................................... 1
1.4.1. Availability ............................................................................................................ 1
1.4.2. O eration.............................................................................................................. 1
2. Termo M range.................................................................................................................. 2
2.1 Key to Termo boilers.................................................................................................... 2
2.1.1 Termo RS - M........................................................................................................ 2
2.1.2 Termo Plus - M...................................................................................................... 4
2.1.2 Termo PTV - M...................................................................................................... 6
2.2 Ex ansion Vessel Characteristics (Plus And PTV Boilers) ........................................... 8
2.3 Power su ly characteristics 240V............................................................................... 8
3.0. Installation ...................................................................................................................... 9
3.1. Content included in delivery ........................................................................................ 9
3.2 Standards & Regulations ............................................................................................. 9
3.3. Physical Installation site.............................................................................................. 9
3.3.1 Select osition for boiler .......................................................................................10
3.3.2 Fitting the boiler hanging bracket..........................................................................10
3.3.3 General recommendations when handling............................................................10
3.3.4. Removing/fixing the front and to case................................................................11
3.4. Plumbing & Heating installation & commissioning ......................................................11
3.4.1 Installation ............................................................................................................11
3.4.2 Ancilliary com onents...........................................................................................11
3.5. Connection to the electrical mains su ly ..................................................................12
3.6. Connecting external controls......................................................................................13
3.6.1 Connect room thermostat/ rogrammer.................................................................13
3.6.2. Connecting external um on TERMO RS boilers ...............................................13
4. Commissioning.................................................................................................................14
4.1. Control anel key.......................................................................................................14
4.2 Protection from freezing..............................................................................................14
5. Fault finding guide ............................................................................................................15
6. Maintenance.....................................................................................................................21
6.1. Periodic checking.......................................................................................................21
7. After Sales service information .........................................................................................21
8. Cascade ower limiter ......................................................................................................21
9. OSO Hotwater UK Ltd ......................................................................................................21
10. A endices.....................................................................................................................22
10.1 Termo RS-M with s ace heating and water heating ..................................................22
10.1.1. Hydraulic diagram Termo RS-M ........................................................................22
10.1.2. Electric diagram Termo RS-M............................................................................22
10.1.3. S- lan wiring layout ...........................................................................................23
10.2 Termo RS s ace heating only...................................................................................24
10.2.1 Hydraulic diagram Termo RS-M .........................................................................24
10.2.2. Electric diagram Termo RS-M............................................................................24
10.2.3. S-Plan wiring layout Termo RS-M......................................................................24
10.3 Termo Plus - M .........................................................................................................25
10.3.1. Hydraulic sketchs Termo lus-m.......................................................................25

INSTRUCTIONS FOR INSTALLATION
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10.3.2 Electric sketch Termo lus-m..............................................................................25
10.3.3 S-Plan wiring layout............................................................................................25
10.4. Termo PTV - M ........................................................................................................26
10.4.1 Hydraulic sketch Termo PTV-m ..........................................................................26
10.4.2. Electric sketch Termo PTV-m ............................................................................26
10.4.3. S-Plan wiring layout...........................................................................................26

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Terminology used in this manual
The central heating boiler water circuit is called rimary
The domestic hot water is called secondary (dhw)
1. Introdu tion
Thank you for urchasing the Oso Termo range electric central heating boiler.
To ensure a correct and safe installation and economical use, lease read these instructions thoroughly before
installation.
1.1. Appli able do uments
The following additional documents are rovided with the a liance:
For the owner of the system:
Instructions for use
Warranty card
For the qualified te hni ian:
Instructions for installation
Electrical drawing for the a liance
1.2. Retention of do uments
Please ass on this installation manual to the owner of the system. The owner should retain the manuals so that
they are available when required.
1.3. Features & benefits
TERMO roducts are modulating and economical central heating boilers that may be used as inde endent or
additional source of heat.
The boiler rovides wet system central heating by assing the rimary water over the immersion heaters. Heating
elements are located on under-side of boiler ensuring elements are constantly immersed in heating medium
(water with a ro riate inhibitor). Power is modulated automatically to control 1, 2 or 3 immersion elements with
built in ste regulator or manually with switches on the control board.
The boiler o erates on rinci le of ra id heating smaller water quantities, energy use is 100% efficient.
Power out uts available are 4.8, 6, 7.2, 10.8, 14.4 kW.
The boiler has an automatic um overrun for both central and water heating that revents a build u of heat in
the boiler. The boiler reservoir is insulated with 19 mm self-extinguishing Armaflex insulating material, which is
sufficient to direct the heat only to the heating system. Tem erature o eration can range from 20
o
C to 90
o
C.
1.4. Operation of domesti hot water (where appli able)
1.4.1. Availability
Termo PTV boilers are designed to control a se arate indirect water storage cylinder.
1.4.2. Operation
Domestic water heating has the reference over central heating. When the cylinder thermostat calls for heat, the
s ace heating circulation um is switched off and domestic hot water um is switched on. (Honeywell ST6400)
Recommended tem erature inside boiler while heating domestic hot water is 75
o
C – 80
o
C.
Observe Honeywell ST6400 manuals for more detailed descri tion of domestic hot water arameters.

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2. Termo M range
2.1 Key to Termo boilers
2.1.1 Termo RS - M
1. Primary flow 7. Control anel 13. Drain valve (not su lied)
2. Primary return 8. Cable entry oint 14. Isolation valves (not su lied)
3. External boiler jacket 9. Contactors and RCD switch 15. Manual venting valve (not su lied)
4. Boiler 10. Charge and discharge valve
5. Armaflex Insulation 11. Pocket with tem erature robe
6. Immersion heaters 12. Safety valve (su lied loose)

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RS - M
TECHNICAL DATA FOR TERMO RS - M BOILERS
Power
kW
Capa ity
Lit.
Dimensions
mm
Weight
kg
Maximum
oprerating
pressure
MPa (bar)
Conne tion Power supply
4.8
6
7.2
10.8
14.4
6
A 330
B 750
C 230
D 100
E 57
F 126
21.4 0,25 (2,5) 3/4” 240V N ~ 50/60 Hz

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2.1.2 Termo Plus - M
1. Primary flow 8. Cable entry oint 15. Boiler venting valve
2. Primary return 9. Contactors 16. Air-indicator
3. External boiler jacket 10. Ex ansion vessel 17. Manifold
4. Boiler 11. Circulation um 18. RCD switch
5. Armaflex insulation 12. Safety valve 2.5 bar 19. Pocket with tem erature robe
6. Electrical heaters 13. Automatic air vent (AAV) 20. Pressure robe
7. Control anel 14. Charge and drain valve

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TERMO – Plus - M
TECHNICAL DATA FOR TERMO PLUS - M BOILERS
Power
kW
Boiler
Capacity
Litres
Expansion
vessel
L/bar
Dimensions
Mm
Dry
Weight
kg
Maximum
primary
operating
pressure
MPa bar)
Connection
BSP male
Power supply
4.8
6
7.2
10.8
14.4
6 8 / 0,8
A 330
B 930
C 230
D 100
E 65
F 320
34.5 0,25 (2,5) ¾” 240V N ~ 50/60 Hz

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2.1.2 Termo PTV - M
1. Primary flow 9. Contactors 17. Manifold
2. Primary return 10. Ex ansion vessel 18. RCD switch
3. External boiler jacket 11. Circulation um 19. Pum for water cylinder
4. Boiler 12. Safety valve 2.5 bar 20. Primary flow for water cylinder
5. Armaflex insulation 13. Automatic air vent (AAV) 21. Pocket for tem erature robes
6. Electrical heaters 14. Charge and drain valve 22. Pressure robe
7. Control anel 15. Boiler venting valve
8. Cable entry oint 16. Air-indicator

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TERMO PTV - M
TECHNICAL DATA FOR TERMO PTV - M BOILERS
Power
kW
Boiler
Capacity
Litres
Expansion
vessel
L/bar
Dimensions
Mm
Dry
Weight
kg
Maximum
primary
operating
pressure
MPa bar)
Connection
BSP male
Power supply
4.8
6
7.2
10.8
14.4
10 10/0,8
A 400
B 930
C 230
D 150
E 65
F 150
G 50
H 305
44.2 0,25 (2,5)
¾”
cylinder
1”
(heating)
240V N ~ 50/60 Hz

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2.2 Expansion Vessel Chara teristi s (Plus And PTV Boilers)
Volume of
Expansion
Vessel
L
Maximum
Expansion
Vessel
Pressure
MPa bar)
Filling
Pressure
MPa bar)
Maximum
Pressure
In heating
System
MPa bar)
Max Height
Difference
in central
Heating
System
m
Effective
capacity of
Expansion
Vessel
L
Adsorption
Capacity
%
Maximum
amount of
water in
primary
system
L
Maximum
power of
Boiler
kW
8 4.0 114 14.4
10
0.4 (4) 0.08
(0.8) 0.3 (3) 10
5.0
50%
143 14.4
Values are related to working tem erature range from 10C to 90C.
2.3 Power supply hara teristi s 240V
POWER nominal
urrent
MCB Rated short- ir uit
breaking apa ity
I
n
(EN 60898)
Rated short- ir uit
breaking apa ity
I
n
(IEC 947-2)
Cable size* RCD swit h
type
4.8 kW 20 A B25-1 25-2/0.03 A
6 kW 25 A 3 x 4 mm
2
7.2 kW 30 A B32-1 3 x 6 mm
2
40-2/0.03 A
10.8 kW 45 A B50-1 63-2/0,03A or
40-4/0.03 A
14.4 kW 60 A B63-1
10 kA 15 kA
3 x 10 mm
2
80-2/0,03A or
63-4/0.03 A
min. ondu tor's ross-se tion in mm
2
is based on maximum length of 20 m.

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3.0. Installation
3.1. Content in luded in delivery
TERMO boilers are delivered re-assembled. Check
that all arts have been delivered intact. For exact
list of arts see figure and table below. If arts are
damaged or missing, lease consult Oso Hotwater
UK Ltd.
Contents in luded with delivery
Item Quantity Des ription
1 1 TERMO boiler
2 1 Instructions
Electrical drawing, Warranty card
3 1 Hanging bracket
4 1 Safety valve (not fitted to boiler in case of TERMO RS)
Table of ontents in luded with delivery
3.2 Standards & Regulations
The Oso Termo range of boilers are BEAB approved and CE marked.
Health and Safety at Work A t 1974 - When working with Termo boilers, ensure that prote tive lothing
and equipment is used appropriate to parts that may onsidered hazardous to health and safety
Control of Substan es Hazardous to Health (COSHH 1988) - Glues, paints and sealants are used in the
manufa ture of this produ t and present no known hazards when used in the manner for whi h they are
intended.
The guarantee is only valid if the following the following onditions are observed:
The boiler must be installed by a registered engineer to omply with urrent building regulations, IEE
ele tri al wiring regulations (BS 7671), lo al authority regulations, water supply regulations and health
and safety at work regulations.
Other Relevant British/European standards should be adhered to, in luding
BS 5449 - Spe ifi ation for for ed ir ulation hot water entral heating for domesti premises,
BS 7593, treatment of water in domesti hot water entral heating systems
3.3. Physi al Installation site
IMPORTANT - MOVING THE BOILER EXCEEDS THE RECOMMENDED WEIGHT FOR A ONE MAN LIFT.
The boiler must be handled and trans orted carefully and stored in a safe, dry lace.
TERMO-Plus AND TERMO-PTV are designed for wall installation in an u right osition. Wall brackets are
rovided on the back of the boiler. The boiler should be fixed in osition on a suitable load-bearing wall rior to
i e connection.
The boiler should be fitted in a dry lace not subject to extremes of tem erature. Cylinder cu boards and kitchens
are acce table but bath or showers rooms are not.

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3.3.1 Sele t position for boiler
The boiler should referably be installed on the lowest oint in relation to the installation. This ensures that
elements are always immersed in water and there is no danger of burning out.
When ositioning the boiler, ensure there is
adequate s ace surrounding to allow for i e
connection, ventilation, servicing and re lacement
of com onents including the immersion heaters.
Refer to diagrams below for guidance.
Access is required to the control anel connections
at underside of the boiler and the ower su ly
connection, located at left bottom side of boiler.
Ensure the boiler is in a location where it will not be
affected by water dri s or s lashing.
Ensure that ventilation to the boiler is not im eded
by towels, linen etc laced very close to the boiler.
Do not lace towels or linen on to of the boiler.
The figure below shows minimum recommended
clearances
Re ommended minimal distan es
3.3.2 Fitting the boiler hanging bra ket
Fix the hanging bracket (see age 9 No. 3) to the
wall using suitable lastic lugs and M8 or M10
screws (not su lied). Decide the osition of the
bottom of the boiler, giving due consideration to the
recommended minimum clearance and then drill
holes to acce t the boiler mounting late.
Screw oints should to be drilled the following
distances above the bottom of the boiler casing
RS – E 624mm
Plus – E 610mm
PTV – E 625mm Wall mounting
Note:
If the boiler is to be fitted in a timber framed building ensure that the bra ket is se ured to a substantial
part of the timber frame apable of taking the weight of the boiler.
3.3.3 General re ommendations when handling
Clear the route before attem ting the lift. Ensure safe lifting techniques are used – kee back straight – bend
using legs. Kee load as close to body as ossible. Do not twist – re osition feet instead. If 2 ersons erforming
lift, ensure coordinated movements during lift. Avoid u er body/to heavy bending - do not lean
forward/sideways. Recommend wear suitable cut resistant gloves with good gri to rotect against shar edges
and ensure good gri . Always use assistance if required.
Positioning of Applian e for Final Installation
Lift u boiler (3) above hanging bracket (2), gently lean it to the wall (1) and slide it down to hanging bracket (2).

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3.3.4. Removing/fixing the front and top ase
Gras the front case by its sides, ull it towards the
front and remove it by lifting it off the unit, ush to
cover towards back and lift it off the unit.
3.4. Plumbing & Heating installation & ommissioning
3.4.1 Installation
On RS - M boilers fit the su lied safety valve to the heating return oint on the installation– see oint 12 age 4
diagram. Ensure that no valve is laced between the safety valve and the boiler.
To avoid draining the entire rimary system during boiler maintenance it is recommended that isolation valves are
fitted to the flow and return i es immediately below the boiler.
Connect the rimary flow and return i es for the central heating system to the labeled connections on the boiler.
Connect the mains water su ly via a filling loo to the charge and discharge valve on the boiler incor orating a
sto valve and double check valve which must be left disconnected after commissioning.
Drain ta s must be located in accessible ositions which ermit the draining of the whole system including the
rimary and the secondary (dhw) system.
Any water loss from the system should be re laced from the filling loo connection.
When draining the boiler allow air in using the boiler venting valve. Do not drain the boiler by o ening the
ressure relief valve.
All ca illary joints in all DHW i ework must be made with lead free solder.
The Plus – M and PTV – M are self contained system boilers that manage heating flow to the radiators and or
under floor. The PTV – E also su ly heat to a domestic hot water cylinder. External motorized valves are not
normally required (exce ting when the PTV – M is connected to an Unvented Water Heater) and therefore
systems such as S & Y lan are not a licable. As motorized valves are not used a by ass is not normally
required. Product diagrams on ages 5 & 7 dis lay the ex ansion vessel and um s.
Termo Plus and Termo PTV are be also be used on an o en vented central heating system.
Wherever ossible all i e work should be insulated to hel revent heat loss and ossible freezing, articularly
where i es are run through roof s aces and ventilated under-floor s aces.
3.4.2 An illiary omponents.
On RS – M boilers a boiler ressure gauge, circulation um and ex ansion vessel must be fitted. The ex ansion
vessel should be sized to the total system volume. The water ca acity of the boiler itself is 6 litres.
Diagram of recommned um on RS-E for radiator heating Diagram of recommned um on RS-E for underfloor heating

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If the ca acity of the in built ex ansion vessel on Plus - E & PTV - E is not sufficient for the heating system, an
additional ex ansion vessel can be installed external to the boiler. This should be fitted to the return i e as close
as ossible to the boiler.
To com ly with Part L of building regulations, a room thermostat must be fitted with the boiler. The room
thermostat should not be sited over radiator or other heat source and should not be in direct sunlight.
Thermostatic radiators valves may also be used, but should not be fitted in the same room as the room
thermostat.
After the central heating circuit has been laid o en all service valves, flush i es through and check for leaks
before commissioning and introduce the correct inhibitor for a central heating circuit in accordance with BS7593.
Commission the boiler slowly to allow air to esca e through the automatic air vent. Remove air from um using
front screw on um s.
Pressurize the system to 1.5 bar.
Where the boiler is being retro-fitted to an existing installation, it is equally im ortant to flush the system and
commission using inhibitor to BS7593.,
TERMO boilers are fitted with an automatic and manual air vent. The boilers are also equi ed with an air-
indicator which detects the resence of air in the boiler. If air is detected and It exceeds the ermitted level, air-
indicator switches off immersion heaters and circulation um remains active, so that air is allowed to esca e
easily. Once the air is dis elled the immersion heaters will be active.
3.5. Conne tion to the ele tri al mains supply
Before working with the a liance, turn off the ower su ly (MCB) and secure against restart.
This device must be earthed.
Check that the electrical su ly to the building has sufficient current and voltage to su ly the boiler and other
a liances to be used.
Miniature circuit breakers (MCB) must be fitted in the
wiring rior to the boiler. For MCB ratings see table on
age 8.
Connect boiler to mains using double ole linked
switch with 3mm contact ga in both oles. There is
an RCD switch factory fitted inside the boiler. Su ly
cables must be connected to RCD switch inside boiler
as shown below. Stretching force of the network
connection is 3,5 Nm.
In order to connect ower su ly cable, ower
connection rotection cover (1) must be removed by
unwinding two screws and ulling rotection cover
down. The ower cable must be connected directly to
RCD, earth must be connected to se arate terminal
(3). After connecting ower cable, rotective cover (1)
must be re laced and securely fastened.
After electrical installation is com leted carry out
reliminary safety checks according to BS7671:2001
Power supply onne tion
Boilers with ower 10.8kW and 14.4 kW Boilers with ower 4.8, 6, 7.2 kW
RCCB (RCD) onne tion loseup

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Note:
Power cables from Ø6 mm to Ø20 mm must be connected from left side of boiler and rotective cover (see 1
above) must be secured, ower cables in excess of Ø20 mm must be connected from bottom side of boiler (see 4
above) using rovided lastic inducer for electric cable.
Ensure that the wires are securely fixed.
The a liance must be connected to mains electricity and tested according to current IEE regulations. An NICEIC
ins ection and com letion certificate must be issued.
All ex osed i ework must be earthed according to current IEE regulations
3.6. Conne ting external ontrols
Removable connectors for room thermostat, external um s and tem erature robes are located on connections
late as shown (right). Available connectors are de endent on boiler ty e and boiler o tions.
Terminals OUTDOOR TEMP. and DOMESTIC WATER are not used in M version of Termo boilers.
Power su ly to control unit:
L - Live feed to external unit
N – neutral to external unit
PE – earth to external unit
3 – switched live from external unit for DHW
4 – switched live from external unit for s ace heating
Note: For more details see selected a endix
Conne tion plate
3.6.1 Conne t room thermostat/programmer
When connecting the room thermostat, follow thermostat manufacturer’s instructions to connect to Termo boiler.
The boiler is su lied with a fixed link between L and 4. If an external control device (room thermostat and/or
rogrammer)is used, remove this link. The boiler’s terminals 3, 4 and L N PE ( ower su ly for control unit) are
for connection to room thermostat/ rogrammer.
3.6.2. Conne ting external pump on TERMO RS boilers
TERMO RS boilers do not have inbuilt central heating um and um for domestic water cylinder. Em ty
terminals on connection late are rovided to fit external um s.
Terminal CH PUMP is rovided for central heating um . Connect um L, N, PE wires to the a ro riate
connection orts.
Terminal HW PUMP is rovided for domestic water cylinder um . Connect um L, N, PE wires to the
a ro riate connection orts.

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4. Commissioning
4.1. Control panel key
1 – Indicator of tem erature / ressure in boiler
2 – Working thermostat
3 – Switch for the 2
nd
and 3
rd
o eration stage
4 – Cutout thermostat with manual deactivation
(o erates at 100
o
C)
5 – Air Indicator/Low voltage indicator
6 - Switch for ON/OFF and 1
st
heating stage
7 – Fuse (2.5A) rotecting um and switches
8 – Indication of heater o eration
Standard ele trome hani al ontrol panel
Swit hing boiler on
Test the RCD switch by ressing T button on it. Reset the RCD switch.
Switch on boiler at switch (6). First ower stage activates. Switches (3) manually activate second and third ower
stage of boiler. Boilers with 3 stages have soft start for second and third stage and switches (3) have only limiting
function. If the boiler is heating, heaters in o eration (8) lights, if heaters are not working and boiler is in standby
only ON/OFF light is on.
Adjustment of desired temperature of entral heating
Select desired tem erature in boiler using working thermostat (2). Recommended tem erature is about 60ºC (12
clock osition). Thermostat range is 20ºC to 90ºC.
Air in the boiler/ Low Voltage (5), red light
Light will illuminate red if air a ears in the boiler. The boiler shuts down automatically. To continue o eration,
vent the boiler. When venting is com leted the boiler restarts automatically.
If the voltage dro s below 180V er hase, low voltage rotection light (5) illuminates, the boiler automatically
switches off in order to rotect electronics and contactors inside the boiler. The boiler will automatically restart
when the network voltage exceeds 180V.
Cutout thermostat - turning on
Cutout thermostat (safety thermostat) (4) rotects the boiler against ra id increase of tem erature above 115°C.
The fuse turns off the boiler and tri s the RCD switch.
To restart boiler. Unscrew rotection cover (4) from the cutout thermostat and ress the red key.
NOTE: If the room thermostat is fitted, boiler will only operate if thermostat is alling for heat.
4.2 Prote tion from freezing
Freezing rotection is de endent on the room thermostats. To rotect a ro erty from freezing when the
occu iers are away, the boiler must be left in the ON osition with the central heating rogrammer and/or room
thermostat set to freezing rotection. If there is no reset freezing rotection state on the rogrammer/thermostat,
lower the set tem erature in the ro erty to 5°C. This will reduce energy consum tion whilst offering system
freezing rotection.

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5. Fault finding guide
The boiler is not
operating or radiators
are old
Is the boiler
switched ON?
Switch boiler ON
NO
Is the green
LED light
ON?
YES
Are the MCB
(on master switch
board) and RCD
(in boiler and master
switch board)
switched ON?
NO
Switch ON MCB
NO
Switch ON RCD RCD can't be
switched ON
YES
YES
Reset safety thermostat
and try again to switch
RCD ON
NO
Electrical art of boiler
(heater, switch, relay)
is faulty
Does
DISPLAY
show tem erature
inside boiler?
NO
NO
YES
Is the
tem erature of water
same as
desired?
YES
Wait for boiler to heat u
NO
Is the room
thermostat switched
ON?
YES
Switch ON room
thermostat
Check isolation valves
NO
YES
Faulty control anel
NO
Please check the following before going through fault finding
flowchart.
Check the installation is correct.
All isolating valves are o en.
The system is full of water ( ressurised) and urged of air.
Programmer and controls outside of boiler are on.
Check the electrical su ly is connected correctly and resent
YES
One or more
heaters are faulty

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When swit hed on,
swit hes on ontrol
panel show the
voltage, however the
boiler does not heat
Is the
limiting thermostat
activated?
Safety thermostat can be
activated if air is resent in
installation or o eration thermostat
is faulty or relay is blocked
Is the room
thermostat
too low?
YES
YES
Is the
o erating thermostat
defective?
NO
NO
Re lace the o erating
thermostat with new
YES
Please check the following
before going through fault
finding flowchart.
Check the installation is
correct.
All isolating valves are o en.
The system is full of water
( ressurised) and urged of
air.
Programmer and controls
outside of boiler are on.
Check the electrical su ly is
connected correctly and
resent
NO
Adjust correct tem erature
Is the
RED lam
''air in the boiler''
illuminated?
Check the water ressure
and urged of air
YES
NO
Is the
voltage resent
on immersion
heaters
Re lace the immersion
heaters
YES