Atag iSteel 120, Руководство по установке

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TWIN COIL FORMAT
Indirect twin coil units can be installed in two separate formats:
•
In a solar powered system with a backup boiler.
•
In a system with two non-solar heat sources (normally two boilers).
With either format it is essential that the installation meets all current regulations including, in particular, the high limit
cut out requirements of Building Regulation G3.
UPPER COIL
This is connected to the boiler as per the instructions for a iSteel single coil cylinder with the high limit thermostat inserted
into the middle thermostat pocket and wired to control the supplied two port valve in either the primary flow or return
as indicated in the wiring instructions.
LOWER COIL – SOLAR VARIENT
In a solar system the lower coil is connected to the solar heat source. Either primary coil connection may be used for flow
or return. The solar cylinder sensor supplied is inserted into the lower thermostat pocket and the energy cut out into the
upper pocket. The ‘mechanical’ control thermostat is not normally utilised in a solar system. In systems where the panels
are above the cylinder then the energy cut out shall be wired so as to interrupt the power supply to the solar pump or
controller in the event of over temperature.
In systems where the cylinder is above the panels then the energy cut out should be wired to a suitable two port valve
(not supplied) on the return pipe-work to the solar panel.
LOWER COIL – NON SOLAR VARIENT
This is connected to the additional boiler as per the instructions for a iSteel single coil cylinder with the high limit
thermostat inserted into the lower thermostat pocket and wired to control the supplied two port valve in either the
primary flow or return.