HeatStar XF EC, Product Manual, Page: 22 / 55

21
BOILER WATER CIRCULATING PUMP :
The required boiler circulating pump flow rate performance is detailed in the data contained within the
‘Installation Services’ document supplied with the product, further copy available on request.
Often, a domestic type pump will not be adequate in performance. Likewise, if the boiler circulating pump is built
into the boiler, then the pump will often not be adequate in performance.
The boiler water circulating pump can be wired to run on demand from the Heatstar.
L.T.H.W. SPECIFICATIONS :
The required L.T.H.W. flow temperatures, rates and resistances are detailed in the data contained within the
‘Installation Services’ document supplied with the product, further copy available on request.
If the L.T.H.W. supply provided to the Heatstar falls short of these requirements, then the full heating capacity
will not be achieved.
BOILER PIPE CONNECTIONS TO HEATSTAR :
The pipe connections, which are labelled, should be made with compression fittings. Soldered or brazed
connections should not be used as the excessive localised heat will damage the casing of the unit and may
damage internal pipe connections.
The compression connections should be able to be unscrewed to disconnect the unit for maintenance.
MOTORISED HEATING VALVES :
The motorised heating valves are simple
‘two port’ electric valves which, when electrically powered open, allow
the flow of hot water from the boiler into the heat exchange coils to enable heating. When the power is removed,
the valve is closed automatically by a spring to prevent the flow of hot water from the fuel boiler. Such valves are
commonly used within domestic central heating systems.
Heatstar ‘Super’ versions :
Heatstar Super
versions only incorporate the air heat exchange coil and not any motorised heating valves, so an
external motorised heating valve will need to be provided by the installer.
The external motorised heating valve is powered electrically from the electrical connections within the Heatstar .
The system is compatible for use with either two port or three port external motorised valves.
If external two port valves are used, then a by-pass would also be necessary.
The external valve can either be
‘spring close’ or ‘power close’ in type.
The external heating valve should open and allow L.T.H.W. to the air heating coil when electrical power is
provided.
The electrical supply to the valve from the Heatstar is a switched 230v 1 Amp supply which is either on or off
and not proportional.