INSTRUCTIONS FOR INSTALLATION
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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
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. 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
o
C to 90
o
C.
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
o
C – 80
o
C.
Observe Honeywell ST6400 manuals for more detailed description of domestic hot water parameters.
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