OSO HOTWATER OSO TERMO PLUS-E User manual

The company reserve the right to alter size, shape and specification without prior notice
TMS-UT-0804-Z01-4 page 1
TERMO ELECTRIC BOILER
INSTALLATION MANUAL
OSO TERMO PLUS - E

The company reserve the right to alter size, shape and specification without prior notice
TMS-UT-0804-Z01-4 page 2
1. INTRODUCTION ................................................................................................................................. 3
1.1. APPLICABLE DOCUMENTS ............................................................................................................................. 3
1.2. RETENTION OF DOCUMENTS.......................................................................................................................... 3
1.3 TERMO ECONCEPT ........................................................................................................................................ 3
2. TERMO E RANGE .............................................................................................................................. 4
2.1. KEY TO TERMO BOILERS ............................................................................................................................ 4
2.1.2 PLUS -E...................................................................................................................................................... 4
2.2 EXPANSION VESSEL CHARACTERISTICS (PLUS AND PTV BOILERS).............................................................. 5
3. SUPPLY CHARACTERISTICS 240V N ~ 50/60 HZ........................................................................... 6
4. INSTALLATION .................................................................................................................................. 6
4.1. CONTENT INCLUDED IN DELIVERY ................................................................................................................ 6
4.2 STANDARDS &REGULATIONS ....................................................................................................................... 6
4.3. PHYSICAL INSTALLATION ............................................................................................................................. 6
4.3.1 SELECT POSITION FOR BOILER..................................................................................................................... 7
4.3.2 FITTING THE BOILER HANGING BRACKET .................................................................................................... 7
4.3.3 RECOMMENDATIONS FOR HANDLING .......................................................................................................... 7
4.3.4 REMOVING/FIXING THE FRONT AND TOP CASE ............................................................................................ 7
4.4.1 INSTALLATION ............................................................................................................................................ 8
4.4.2 ANCILLARY COMPONENTS. ......................................................................................................................... 8
4.5 CONNECTION TO THE ELECTRICAL MAINS SUPPLY ......................................................................................... 9
4.6 CONNECTION PLATE FOR CONTROL EQUIPMENT, TEMPERATURE SENSOR & PUMP…………………...10
4.6.1 CONNECT ROOM THERMOSTAT/PROGRAMMER...........................................................................................10
4.6.2. FIT EXTERNAL TEMPERATURE SENSOR......................................................................................................10
5. SETTING UP BOILERS .................................................................................................................... 11
5.1 CONTROL PANEL (INCLUDING FAULT FINDING INDICATORS) ........................................................................11
5.2. CHOOSE TYPE OF HEATING (RADIATOR OR UNDER FLOOR HEATING)............................................................12
5.2.1 HYBRID SYSTEMS COMBINING RADIATOR AND UFH. ................................................................................12
5.3. ACTIVATING SYSTEM AND PROGRAMMING CENTRAL HEATING ....................................................................13
5.3.1 HEATING CURVES EXPLAINED....................................................................................................................14
5.3.2 TO SET CORRECT CURVE ............................................................................................................................14
5.3.3 SETTING INTERNAL TEMPERATURE…………………………………………………………………………...14
5.3.4 PROGRAMMABLE ROOM THERMOSTATS &SETTING VARIABLE INTERNAL TEMPERATURES........................15
5.5 PROTECTION FROM FREEZING .......................................................................................................................15
6. RECOMMENDED ANNUAL CHECKS (ALL BOILERS) ................................................................. 15
7. CENTRAL HEATING CONTROLS ADVANCED MENU.................................................................. 16
8. FAULT FINDING GUIDE................................................................................................................... 18
9. AFTER SALES SERVICE INFORMATION ...................................................................................... 20
10. TECHNICAL DATA......................................................................................................................... 21
11. OSO HOTWATER UK LTD............................................................................................................. 21
12. APPENDICES ................................................................................................................................. 21
12.3 –APPENDIX 3-TERMO PLUS E .................................................................................................................21
12.3.1 SCHEMATIC DIAGRAM TERMO PLUS-E ............................................................................................................21
12.3.2 WIRING DIAGRAM TERMO PLUS-E…………………………………………………………………………….22

The company reserve the right to alter size, shape and specification without prior notice
TMS-UT-0804-Z01-4 page 3
TERMINOLOGY USED IN THIS MANUAL
The central heating boiler water circuit is called primary
1. Introduction
Thank you for purchasing the Oso Termo E electric central heating boiler.
To ensure a correct and safe installation and economical use, please read these instructions thoroughly before
installation.
1.1. Applicable documents
The following additional documents are provided with the appliance:
For the owner of the system:
Instructions for use
Warranty card
For the qualified technician:
Instructions for installation
Electrical drawing for the appliance
1.2. Retention of documents
Please pass 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 Termo - E concept
The Termo Plus E is a wet system electrically heated boiler for space heating only. It is not suitable for use with
an indirect water heater and should not be used under any circumstances to heat domestic hot water.
The boiler provides wet system central heating by passing the primary water over the immersion heaters. The
immersion heaters are located on the under-side of boiler ensuring the elements are constantly immersed in the
heating medium (water with appropriate inhibitor).
Termo Plus E uses weather compensation/heat curve technology. An outside sensor supplied with the boiler
informs the boiler of the outside temperature. This information is used by the boiler to set a temperature in the
heating system. The colder the external temperature, the more internal heating is required.
The boiler is supplied with a range of heat curves built into its software. Once correctly set, the heat curve need
never be altered. Heat curves are set according to the insulation levels of the property. A poorly insulated house
will require a higher primary heating temperature.
Selecting the heating curves at the time of installation is a simple process for the installer. A table is shown on
page 13 indicating which heating curve is required for the building type. Once the heating curve is correctly set, it
should never require changing.
The heating curve will aim for the property to be heated to 22°C. Not all households wish for the same internal
temperature, if the residents of the property require a higher or lower temperature, the selected curve should be
offset up or down by the appropriate number of degrees. Full instructions are given on page 14.
A room thermostat (not supplied) must be installed to finely regulate internal temperatures.
Heat curve systems operate for longer periods at lower temperatures than traditional systems and can typically
make savings of up to 15% over a standard heating system. Heat curve systems are widely used in Europe but
relatively new in the UK.
Heating curves also vary according to radiator or under-floor heating. The factory set heating curve is for a
building constructed to 2000 building regulations with radiator heating. Many boilers therefore will not require
adjustment of heating curve.
The boiler will modulate 1, 2 or 3 elements to achieve the desired primary temperature. The boiler reservoir is
insulated with 19 mm self-extinguishing Armaflex insulating material, which is sufficient to direct the whole heat
only to the heating system.
The boiler operates by rapidly heating a small water quantity. Energy use is maintained at 100% efficiency.
No flue or fan required - Almost silent in operation - No bulk oil storage tanks required
No annual safety check required

The company reserve the right to alter size, shape and specification without prior notice
TMS-UT-0804-Z01-4 page 4
2. Termo E range
2.1. Key to TERMO boilers
2.1.2 Plus - E
1. Primary flow
2. Primary return
3. External boiler jacket
4. Boiler
5. Armaflex insulation
6. Electrical heaters
7. Control panel
8. Cable entry point
9. Contactors
10. Expansion vessel
11. Circulation pump
12. Safety valve 2.5 bar
13. Automatic air vent (AAV)
14. Charge and drain valve
15. Boiler venting valve
16. Air-indicator
17. Manifold
18. RCD switch
19. Pocket with temperature probe
20. Pressure probe

The company reserve the right to alter size, shape and specification without prior notice
TMS-UT-0804-Z01-4 page 5
Plus – E
Technical Data For Plus E 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
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
2.2 Expansion Vessel Characteristics
Volume of
Expansion
Vessel
L
Maximum
Expansion
Vessel
Pressure
MPa bar)
Pre-charge
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 0.4 (4) 0.08
(0.8) 0.3 (3) 10 4.0 50% 114 14.4
Values are related to working temperature range from 10°
°°
°C to 90°
°°
°C.