Samsung RC090MHXEA Installation 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 either horizontally or vertically 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
You will need to put a 2 port valve on both the heat pump and the boiler to shut
them off when they are not operating, you need to supply these. The valve on
the heat pump can be a single check non return valve.
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 trvs
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.
Magnetic Filter
A magnetic filter with strainer must be installed in the return to the unit. A magnetic filter
ensures that debris/foreign materials do not cause restrictions within the pipework / system.
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 ©G Hendra September 2014 5