Hitachi RHUE-3AVHN-HM, Инструкция по установке и справочное руководство

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Example Power Distribution (minimum system configuration)
N.B. this does not show control wiring between units or more complex system designs which may
include additional heat sources and hence require additional isolation and protection devices
All low power ancillaries such as pumps, valves etc. derive power either from the heat pump in the case
of the buffer loading pump and the system controller in the case of all other equipment.
All ancillaries with a power consumption of greater than 3A or that would otherwise require a
total
power derivation from the system controller of greater than 10A MUST be powered by an isolating relay
or contactor.
** Heating System Electrical Connections
Electrical wiring for heat distribution systems is outside the scope of this manual.
It is generally assumed that all heating control and power systems will be entirely separate from the
Heat Pump electrical system and as such additional circuits will be required. Local control of individual
elements of the heating system should reduce energy consumption by preventing the running of heating
circulation pumps when zones are up to temperature.
Where it is essential for the System Controller to ensure circulation, for defrost functions etc. where
there is no suitable buffer tank, the associated control function for at least one open flow heating
circulation pump must be derived from the Advanced System Controller (normally X1). This may be a
direct connection, via a relay or via a contact on the associated 2 port valve as applicable.