Samsung RC090MHXEA Installation And Maintenance Manual page 5

Other components you need to supply and fit:
An expansion vessel, pressure gauge, pressure relief valve and filling
loop
Most heating engineers use a robokit with the appropriate size expansion
vessel, this is sized exactly the same way as when using a boiler.
Pump
Your pump needs to supply 20l/min for the 9kW and 30l/min for the 16kW unit.
The static resistance through the unit is 10kPa for the 9kW and 15kPa for the
16kW unit. The flow meter has a resistance of around 5kPa
The cylinders (Gledhill) have a static resistance of 5kPa for the heat pump coil
and 19kPa for the solar coil.
The total resistance of the components will be approximately 39kPa for the size
9 unit and if the cylinder is piped using both coils and approximately 44kPa for
the size 16 unit if using both coils.
Flow switch and flow meter
The unit requires 16L / min flow at all times, if you don't achieve this
E911 error will occur to check this flow switch is installed. The flow
switch comes with the control box.
The flow Switch MUST be installed in horizontal pipe with at least
150mm of straight pipe either side, connection is 1" female BSP. The
wire is 2m long and needs to connect into the wiring station. This wire can be extended to
suit. We recommend a flow meter is installed into the flow side of the flow switch as per the
photo. Adaptors may be required to enable this join. The flow switch is not IP65 rated
(weatherproof) and so must not be installed externally.
Diverter valves
If you require domestic hot water and heating, diverter valves are
required, you need to supply these. You can use a three port or 2
port valves. The three ports must be of the diverter variety or wired
as a diverter, see wiring.
Bypass Valve
You must install a bypass valve in the heating circuit as far away from the heat
pump as possible. The bypass valve enables flow to be maintained as the trv's
shut down at all times to prevent unit flow fault.
Buffer vessels
We don't normally use buffer vessels on Samsung EHS systems; as long as the water volume
circulating is over 20 Litre. The inbuilt variable speed compressor means the unit can operate
without a buffer.
1m of 22mm pipe holds 380 ml of water, if you add the volume in the unit and components
and make sure you put the bypass valve more than 25m from the heat pump your system
volume will be adequate. When utilizing multiple units, a buffer or low loss header is required
to hydraulically join the units.
Water Filter
In all cases a filter with strainer needs to be installed in the return to the heat pump. A
magnetic filter must also be installed in the return to the unit. The filters ensure that
debris/foreign materials do not cause damage to the heat exchanger in the unit voiding
warranties.
Glycol
A propylene glycol mixture must be utilized to prevent freezing of the water within the system.
It is important that the glycol concentration is adequate to protect the unit in case of power
failure in very cold conditions. If the unit freezes up there will be no warranty. Manufacturer
dependant, a mix of around 25% should suffice.
www.samsungehs.co.uk Hendra – August 2013 5