OSO TERMO RS M Installation Manual

TERMO ELECTRIC BOILERS

MANUAL

OSO TERMO RS -M

OSO TERMO PLUS - M

OSO TERMO PTV – M

B C

Contents

1. Introduction ....................................................................................................................... 1

1.1. Applicable documents................................................................................................. 1

1.2. Retention of documents .............................................................................................. 1

1.3. Features & benefits..................................................................................................... 1

1.4. Operation of domestic hot water (where applicable).................................................... 1

1.4.1. Availability ............................................................................................................ 1

1.4.2. Operation.............................................................................................................. 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 Expansion Vessel Characteristics (Plus And PTV Boilers) ........................................... 8

2.3 Power supply 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 position 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 top case................................................................11

3.4. Plumbing & Heating installation & commissioning ......................................................11

3.4.1 Installation ............................................................................................................11

3.4.2 Ancilliary components...........................................................................................11

3.5. Connection to the electrical mains supply ..................................................................12

3.6. Connecting external controls......................................................................................13

3.6.1 Connect room thermostat/programmer.................................................................13

3.6.2. Connecting external pump on TERMO RS boilers...............................................13

4. Commissioning.................................................................................................................14

4.1. Control panel 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 power limiter......................................................................................................21

9. OSO Hotwater UK Ltd ......................................................................................................21

10. Appendices.....................................................................................................................22

10.1 Termo RS-M with space 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-plan wiring layout ...........................................................................................23

10.2 Termo RS space 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 plus-m.......................................................................25

INSTRUCTIONS FOR INSTALLATION

We reserve the right of alternations

10.3.2 Electric sketch Termo plus-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

INSTRUCTIONS FOR INSTALLATION

We reserve the right of alternations

Terminology used in this manual

The central heating boiler water circuit is called primary
The domestic hot water is called secondary (dhw)

1. Introduction

Thank you for purchasing the Oso Termo range 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

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. Features & benefits

TERMO products are modulating and economical central heating boilers that may be used as independent or
additional source of heat.
The boiler provides wet system central heating by passing the primary water over the immersion heaters. Heating
elements are located on under-side of boiler ensuring elements are constantly immersed in heating medium
(water with appropriate inhibitor). Power is modulated automatically to control 1, 2 or 3 immersion elements with
built in step regulator or manually with switches on the control board.
The boiler operates on principle of rapid heating smaller water quantities, energy use is 100% efficient.
Power outputs available are 4.8, 6, 7.2, 10.8, 14.4 kW.
The boiler has an automatic pump overrun for both central and water heating that prevents a build up 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. Temperature operation can range from 20 oC to 90 oC.

For the qualified technician:

Instructions for installation
Electrical drawing for the appliance

1.4. Operation of domestic hot water (where applicable)

1.4.1. Availability

Termo PTV boilers are designed to control a separate indirect water storage cylinder.

1.4.2. Operation

Domestic water heating has the preference over central heating. When the cylinder thermostat calls for heat, the
space heating circulation pump is switched off and domestic hot water pump is switched on. (Honeywell ST6400)

Recommended temperature inside boiler while heating domestic hot water is 75 oC – 80 oC.

Observe Honeywell ST6400 manuals for more detailed description of domestic hot water parameters.

INSTRUCTIONS FOR INSTALLATION

We reserve the right of alternations
Page 1

2. Termo M range

2.1 Key to Termo boilers

2.1.1 Termo RS - M

1. Primary flow 7. Control panel 13. Drain valve (not supplied)

2. Primary return 8. Cable entry point 14. Isolation valves (not supplied)

3. External boiler jacket 9. Contactors and RCD switch 15. Manual venting valve (not supplied)

4. Boiler 10. Charge and discharge valve

5. Armaflex Insulation 11. Pocket with temperature probe

6. Immersion heaters 12. Safety valve (supplied loose)

INSTRUCTIONS FOR INSTALLATION

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RS - M

TECHNICAL DATA FOR TERMO RS - M BOILERS

Power

kW

4.8

6

7.2

10.8

14.4

Capacity

Lit.

6

Dimensions

mm

A 330

B 750

C 230

D 100

E 57

F 126

Weight

kg

21.4 0,25 (2,5) 3/4” 240V N ~ 50/60 Hz

Maximum

oprerating

pressure

MPa (bar)

Connection Power supply

INSTRUCTIONS FOR INSTALLATION

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Page 3

2.1.2 Termo Plus - M

1. Primary flow 8. Cable entry point 15. Boiler venting valve

2. Primary return 9. Contactors 16. Air-indicator

3. External boiler jacket 10. Expansion vessel 17. Manifold

4. Boiler 11. Circulation pump 18. RCD switch

5. Armaflex insulation 12. Safety valve 2.5 bar 19. Pocket with temperature probe

6. Electrical heaters 13. Automatic air vent (AAV) 20. Pressure probe

7. Control panel 14. Charge and drain valve

INSTRUCTIONS FOR INSTALLATION

We reserve the right of alternations
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TERMO – Plus - M

TECHNICAL DATA FOR TERMO PLUS - M BOILERS

Power

kW

4.8

6

7.2

10.8

14.4

Boiler

Capacity

Litres

6 8 / 0,8

Expansion

vessel

L/bar

Dimensions

Mm

A 330
B 930
C 230
D 100
E 65
F 320

Dry

Weight

kg

34.5 0,25 (2,5) ¾” 240V N ~ 50/60 Hz

Maximum

primary

operating

pressure

MPa (bar)

Connection

BSP male

Power supply

INSTRUCTIONS FOR INSTALLATION

We reserve the right of alternations
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