Download Benchmark BMA 220 SP - SOL Technical data

DESIGN
relief valve and the necessary length of pre-insulated corrugated stainless steel
pipework and sensor cable to complete the solar installation can be supplied by
Gledhill. Please ring our Technical Sales Department for details.
If it is proposed to use copper pipework, the components and insulation will need
to take account of the extremely high temperatures and pressures which can be
experienced, and the ethylene glycol antifreezes which are used. Standard soft
soldered fittings and pipe insulation will not be adequate. The insulation needs to
be Class ‘O’ standard and the bracketting needs to allow for the increased thickness
required. Brazing, press fit type with green viton seals or copper weld type fittings
are all acceptable. Any compression joints will need to have brass olives. Because of
the high temperatures, the pipework should be routed to allow for the necessary
expansion or provided with flexible connectors.
It is recommended that a filling tank/pump should be used to fill and vent the solar
system but the fill and flush valve does incorporate a spare connection for a standard
temporary filling loop (as used for central heating systems) so that once the system
has been filled with the necessary antifreeze mixture, mains water pressure can
be used to charge the system. Details of the
filling/commissioning procedure using a filling
tank/pump are included later in the Installation
section of these instructions.
All the necessary Health and Safety requirements
should be followed when lifting and fitting the
solar panels (collectors) on the roof.
To prevent overheating in the summer (and
discharge from the pressure relief valve), we
suggest a saving of 50% of the energy required
for the domestic hot water should be used as
the target when calculating the number/area
of solar panels (collectors) required. In addition
to this we believe that a further 10-15% saving
will be achieved because the BoilerMate A-Class
OV SOL also contributes energy to the heating
system.
Switch
The BoilerMate A-Class OV SOL is supplied with
a 6kW electrical emergency back up system
called ‘Switch’ which can be used to provide
some heating/hot water in the case of failure
of the main heat source i.e. gas boiler.
This must NOT be used for prolonged periods
or used to supplement hot water production
only in summer if the main system is working
correctly.
Full details of the electrical requirements
are provided in the Site Requirements and
Installation sections of these instructions.
‘Switch’ will be activated by pressing the centre
push button (marked ‘Switch’) located on the
front control panel for at least 5 seconds (see
diagram opposite). This replaces the function
of the external boiler with the internal electric
emergency boiler. The operating mode shown
on the display will change fron ‘Normal’ to
‘Switch’. The ‘Switch’ symbol will flash as long
as Switch is active.
During Switch operation the hot water and
central heating will still operate in a timed
mode. The operating times can be altered
by resetting the clock, if required, to suit the
reduced energy input available.
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SYSTEM DETAILS
Once the fault has been resolved return to
normal boiler operation by pressing in the
centre push button marked ‘Switch’ for at least
5 seconds. The operating mode on the display
will return to ‘Normal’.