Samsung RC090MHXEA Manual

www.samsungehs.co.uk Hendra – June 2013 1

Air Source Heat Pump

Installation and Maintenance Manual

Model Numbers:

RC090MHXEA

RC160MHXEA

June 2013

www.samsungehs.co.uk Hendra – June 2013 2

The outdoor unit (boiler)

Deciding on Where to Install the Outdoor Unit

The outdoor unit must not be placed on its side or upside down, as the compressor lubrication

oil will run into the cooling circuit and seriously damage the unit.

Choose a location where the noise of the Air to Water Heat Pump when running and the

discharged air do not disturb any neighbours.

Install the outdoor unit on a flat, stable surface with plenty of drainage, gravel or grass is

ideal; make sure the base can support its weight

Position the outdoor unit so that the air flows into an open area.

Place the outdoor unit where there are no plants and animals

When installing the outdoor unit near sea make sure it is not directly exposed to sea breeze.

The golden rule is, if you can see the sea from the position of the outdoor unit you need to

apply Blygold or equivalent anti-corrosion coating on the whole unit.

The unit needs to be securely

mounted at least 100mm off the

ground on rubber feet or wall

brackets, the unit must be bolted

down for security using 10mm bolts

and Zebedee bolts.

The unit must have adequate

drainage away from the unit; it can

produce up to 6 L / hour.

There is a drainage kit included

which we recommend you don’t

use, its best to let the unit drain into

the ground. The drain holes in the

unit are clearly shown, if a drip tray

is used it must be 25mm longer and wider than the base of the unit to catch all the drips.

Dimensions:

Size 16 - 1420mm (h) 940mm (w) 330mm (d) 103kg

Size 9 - 998mm (h) 940mm (w) 330mm (d) 75kg

The space around the unit is very important, allow:

150mm to the left hand side (facing the front of the

unit), 600mm to the right of the unit, 300mm to the

rear of the unit and 1500mm to the front of the unit.

The unit will not benefit from being mounted on the

North or South of the building any aspect is fine, you

should avoid very exposed positions to avoid wind

blowing into the back or front of the unit and very

sheltered positions.

An exposed location may increase difficulty for full unit defrost.

The Control Box

When the heat pump is delivered it comes with a control box which also contains the flow

switch. Install the control unit indoors as it’s not waterproof.

It needs to be sited within 15m of the hot water cylinder, 100m of the outdoor unit and as near

as possible to the pump, flow switch and any zone valves.

The box is 323mm wide, 339mm high, 131mm deep

www.samsungehs.co.uk Hendra – June 2013 3

The 9kW unit has 1 inch BSP

male connections; these should

be connected to flexi hoses.

To maintain flow rate we

recommend 28mm pipework is

used with this machine. NEVER

use 22mm plastic tube, if you

insist on using plastic use 28mm

throughout

All Pipework including the flexis

need to be insulated with 23mm

lagging

It is essential to connect an

expansion vessel, pressure

gauge, pressure relief valve, filling

loop, magnetic filter/strainer and

automatic bypass.

A pump will be required, normally

in the flow. Dependant on system

resistance some times, 2 pumps

may be required.

Either a 3 port diverter valve or 2

x 2 port valves need to be

installed for domestic hot water

prioritisation.

A flow meter / setter and flow

switch should be installed and a

strainer in the return.

The domestic hot water cylinder

must be manufactured specifically

for the heat pump and have a coil

with a surface area of more than

3m^2 equivalent..

www.samsungehs.co.uk Hendra – June 2013 4

The 16 kW unit has 1 inch BSP

male connections, these should

be connected to flexi hoses

(supplied).

To maintain flow rate we

recommend 28mm pipework is

used with this machine. NEVER

use 22mm plastic tube, if you

insist on using plastic use 28mm

throughout

All Pipework including the flexis

need to be insulated with 23mm

lagging

It is essential to connect an

expansion vessel, pressure

gauge, pressure relief valve, filling

loop, magnetic filter/strainer and

automatic bypass.

A pump will be required, normally

in the flow. Dependant on system

resistance some times, 2 pumps

may be required.

Either a 3 port diverter valve or 2

x 2 port valves need to be

installed for domestic hot water

prioritisation.

A flow meter / setter and flow

switch should always be installed

and a strainer in the return.

The domestic hot water cylinder

must be manufactured specifically

for the heat pump and have a coil

with a surface area of more than

3m^2 equivalent.

www.samsungehs.co.uk Hendra – June 2013 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 tevs

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 should 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 – June 2013 6

The Cylinder

The cylinder needs to be installed less than 15m from the control box to allow for the

temperature sensor cable. Note the size and weight of the cylinder. Full installation

instructions are included with the cylinder.

We only recommend using Gledhill heat pump stainless steel cylinders however other

cylinders can be used IF the coil area is more than 2.5m^2. Smaller coils are not acceptable

and cannot be used. Please do not attempt to utilize a standard central heating, non-heat

pump optimized cylinder. Cylinders can be pressurised or open vented.

When using Gledhill cylinders both the heat pump

(top) coil and the solar (bottom) coil should be

used. If no solar thermal is being used the heat

pump should connect to both coils as per the

recommendations in the Gledhill installation

instructions, and oversized by 30% to take into

account 0kW input from solar thermal in winter.

The G3 regulations state in section 3.13a “for all

indirect heat sources an overheat cut out to

disconnect the supply to the stored vessel in the

event of the stored water overheating must be

employed so that the temperature of the stored

water does not exceed 100C”.

For this reason the heat pump cylinder comes with

a 2 port valve and tank stat. The valve can be

installed in the flow as per the diagram.

However as the refrigerant used in the Samsung

EHS is R410A it is not able to physically heat above its critical temperature of 72.8C.

Many heating engineers do not install this valve.

If solar thermal is used it needs to be connected to the bottom coil of the cylinder as shown.

www.samsungehs.co.uk Hendra – June 2013 7

www.samsungehs.co.uk Hendra – June 2013 8

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 tank in

the top ½ of the cylinder. The tanks sensor needs to go 115mm

into the tank; 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

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. NOTE the

pump will run on for 6 minutes after the unit is told to stop. Hot water production is not

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 Hendra – June 2013 9

Start Up Procedure

Disable the cooling function, with the power OFF, remove

the front of the remote controller, slide it upwards, turn it

over and flick dip switch 1 and 5 to on.

Cooling will no longer be available

On the outdoor unit remove the front cover, there

are 2 screws at the top and one at the bottom, slide

the cover down. Inside the unit is a baseplate

heater which is not normally required in the UK,

disconnect the bottom wire white plug and tuck it

out the way

Filling and flushing:

The Building Regulations for England and Wales, Part L, 2006, now require a central heating

system to be cleaned and inhibited chemically whenever the boiler is changed or any major

works are carried out to the system.

When installing any Heat pump we insist on a thorough system flush prior to connection of the

new equipment, your warranty will be at risk if a suitable flush is not carried out and the

system becomes blocked during normal operation.

Power flushing

The recommended procedure is to power flush the system in both forward and reverse

directions at 110% of the normal flow rate and to use a chemical flushing agent where

required.

Filling

Using the power flusher fill the system with water and 25% Propylene Glycol to more than 1

bar. It’s a good idea to note what the flow rate is through the system on the inline flow meter.

DON’T fill the unit with a hose expecting no air locks, the heat pump is prone to air locking at

the outdoor unit, there is no auto air vent here.

Don’t pour neat glycol into the unit; there is no chance of the heating pump moving neat

glycol around the system.

Powering Up

Apply power to indoor control box first then the outdoor unit.

On the outdoor unit PCB the display will show 88 88, It will then

say Ad meaning it’s checking the addresses for you.

Soon it will say Ad then flashing numbers 00, 01 02 etc. Finally it

will count up to 15. It has now finished addressing.

It will now flash a message like 00 00, dE, F0 etc.

This is it telling you the units it can see. The unit is now ready to

run.

If the outdoor unit / remote controller show E201 there is a comms

error. Check the comms cable F1 and F2.

In the middle of the control box PCB you will see two tiny leds one

red and one orange flashing. The red one shows the signal leaving

the PCB and the orange shows the signal coming back from the

outdoor unit.

www.samsungehs.co.uk Hendra – June 2013 10

Electrically testing the unit

It is possible to test each component one after another using a service function. You can use

this to make sure you have wired everything correctly.

To access service mode press blue set button and test button together for 5 seconds.

The controller will display TEST.

Press the top left button the unit will

run the pump.

Press weekly to test the immersion

heater in the hot water cylinder

Press grey set button to test the

backup boiler

Press the lock button to test the hot

water valve

Press the top left button to open the

heating valve 1

Press the std eco power button to

open the heating valve 2

Using the blue view button you can see 5 temperature sensors, inlet and outlet to the heat

exchanger, the red sensor (where used), water tank and sensor in the remote controller.

(After you have set all the field settings) If you have wired in an external run signal /

thermostat when this is operating heat 1 or heat 2 will be displayed when it is operated.

To exit service mode press and hold cancel delete for 5 seconds

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