Wiring And Power Supply Information - Samsung RC090MHXEA Installation And Maintenance Manual

Wiring and Power Supply Information:

Power
The EHS system needs 2 power supplies:
One connects into the outdoor unit, 20 Amp for the 9kW and 32
Amp for the size 16
The one for the control box is 16 Amp and wires into the top of
the breaker (mcb) in the box
Immersion Heater
The immersion heater is connected into the control box terminals
A3 Neutral and A4 Live, The control box controls the operation of
the immersion heater. If a fused spur is used it must be labelled
as switching it off will cause an error.
Communication cable
This must be run from the outdoor unit to the control box. Use 2 core flex 0.5-1mm (its 16V
ac)
Sensors
The blue cylinder sensor plugs into a socket T4 on the
controller PCB and into the control sensor pocket in the cylinder
in the top ½ of the cylinder. Must be above immersion.
cylinder sensor needs to go 115mm into the cylinder; it must be
clipped so it can't pull out.
The red safety sensor is to avoid over temperature, when using a backup boiler or heater, it
clips to the outlet of the boiler. If no backup boiler is used the sensor is not needed. It plugs
into a red socket T3 on the controller PCB
There is a black wire with a red plug in the box, this is not used.
Sensors cannot not be cut or extended. Keep sensors away from mains cables please
Diverter Valves
Using a three port valve
3 way valve if A to heating & B to HW wire both the white and grey wires to B9, Blue to B7 the
rest are not used. If valve is piped the other way round use terminal B10 instead of B9
Using two port valves
2 port valve for Hot water, wire brown wire to B9 and Blue to B7, the rest are not used.
2 port valve for heating zone 1 wire B14 live and B11 Neutral
2 port valve for heating zone 2 wire B18 live and B15 Neutral
If normally open valves are used connect the live feed for the valves to B10 for
HW, B13 for zone 1 and B17 for zone 2
Thermostats/ timers and under floor heating manifolds
We recommend in all cases the heating should be controlled by an external field supplied
room stat / setback stat time clock etc. or run signal from a boiler enable signal from under
floor manifolds. If both rads and u floor are used in the same system the heat pump can be
controlled to run at 2 different set points one for each thermostat terminal.
To run the unit with radiators make a connection from B20 – B24, to run the unit from under
floor heating make the connection from B20 - B22. B20 is permanently live 240V ac. B19 is
Neutral
When the stat is made the unit will run, when the stat opens the unit will stop.
pump will run on for 6 minutes after the unit is told to stop.
affected and will always take priority.
Pump
The circulation pump must be wired Live to B6 and neutral to B5, MAX pump power is 500
Watts. If two pumps are used wire them both to these terminals
www.samsungehs.co.uk
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Hot water production is not
Hendra – August 2013
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