Samsung RC090MHXEA User manual

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Air Source Heat Pump
Installation and Maintenance Manual
Heating only Hybrid
Model Numbers:
RC090MHXEA
RC160MHXEA

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Hybrid or Bi-Valent heat pumps
A hybrid or Bi-valent heating system uses a heat pump and the existing boiler
together. They are set up to NEVER run at the same time.
This type of system is popular as it means there is no work required to modify the
existing heating system, all radiators are kept the same as is pipework controls etc.
Like a hybrid car when the going is easy the electric system operates and when the
going is hard the oily bit does the work.
In the case of the heating system when the outdoor temperature is warmer (typically
above +3C) the heat pump will heat the house and when the temperature is cold the
boiler will take over.
We normally recommend the old boiler continues to supply hot water and the heat
pump helps out with just the heating, this is especially true if you arre using a combi
boiler.

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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

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The heat pump 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.

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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.

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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 3 Amp and wires into the top of
the breaker (mcb) in the box
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
Sensors cannot not be cut or extended. Keep sensors away from mains cables please
The blue cylinder sensor is not required it is normally used in the cylinder
The red safety sensor is to avoid over temperature, clip it to
the outlet of the combi boiler. 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.
Diverter Valves
2 port valve no 1 for the heat pump wire B6 live and B5 Neutral, this opens when the heat
pump is running.
Thermostats/ timers and under floor heating manifolds
It is now possible to use a single set of controls to drive both systems using a simple
relay,
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.
Make a connection from B20 – B24, to run the unit B20 is permanently live 240V ac. B19 is
Neutral
When the stat is made the heat pump 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.
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

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NOTE terminal
positions
are relevant for this relay only. The terminals are both
normally open; they close when relay is powered.
In cold weather B4 sends a live signal out from the heat pump to the relay, when relay is
switched on this live is sent to the 2 port and the boiler runs. In warmer weather B4 is dead
so the run signal to the heat pump makes it operate, boiler will be off.

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Start Up Procedure:
Checklist
Outdoor unit:
Is there 300mm to the left of the outdoor unit?
Is there 600mm to the right of the outdoor unit?
Is there 300mm to the rear of the outdoor unit?
Is there 1500mm at the front of the outdoor unit?
Is the unit more than 100mm above the ground?
Have you allowed for the unit drainage?
Is there a power supply to the outdoor unit?
Indoor control box
Have you stuck the yellow sticker (attached) to the front of the unit?
Is there a separate supply for the indoor control box
Have you wired in a room thermostat? OR a run signal from ufloor
manifold
Is the Samsung remote controller well out of reach of the end user?
The plumbing:
Is plastic pipe being used? If so is it all bigger than 22mm?
Is a flow meter installed directly into the flow switch?
Is the flow switch horizontal?
Is there 150mm of straight pipe either side of the flow switch?
Is the cylinder sensor plugged in 2/3 of the way up the cylinder?
If the pump is a variable speed type is it set to meet max speed within
10 seconds?
Is there a filter before the return to the heat pump?
Have you installed a bypass valve or allowed for bypass?
Have you got your glycol ready to put in the unit?
Have you lagged all external pipework?

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Start-up Procedure:
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.
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. 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.
With the power OFF, remove the front of the remote controller, slide it upwards, turn it over
DON’T TOUCH THE PCB, there are 8 dip switches near the red sensor, using a small
screwdriver flick dip switch 1 and 5 to on. Cooling will no longer be available. Put the
controller back on the wall.
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
on the back of the white switch box there is a baseplate heater
PCB see picture. Which is not normally required in the UK,
disconnect the bottom wire with the white plug and tuck it out the
way
Powering Up
Apply power to indoor control box first then the outdoor unit.
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. If this doesn’t
happen check there is power on at the outdoor unit. Check the comms cable between the
outdoor unit and the control box F1 and F2.
Put the cover back on the outdoor unit.

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Setting the Clock
Press the grey set button for 5 seconds.
The day will flash, adjust this with the silver up and down
buttons, press grey set.
The hours will flash adjust this with the silver up and down
buttons, press grey set.
The minutes will flash, adjust this with the silver up and
down buttons, press grey set you are back to the normal
screen.

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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 6 seconds.
The controller will display TEST. Immediately press the
top left button to turn the pump on and leave it running
while in test mode to avoid a fault.
Press the top left button the unit will run the pump.
Press the grey set button to start the backup boiler
Using the blue view button you can see 5 temperature
sensors, inlet and outlet to the heat exchanger, the red
sensor (where used), water cylinder and sensor in the
remote controller.
To test the external run signal or
stat is connected adjust temperature on stat up.
If stat is wired to B22 Heat1 will replace test on screen.
If stat is wired to B24 Heat 2 will be displayed.
If both stats 1 and 2 are operating heat 1 and 2 will flash one after
the other. Watch out for this, wireless stats can cause problems
where they send a signal which the unit sees on both terminals, it
sees this through the neutral, if this happens you will need a relay.
To exit service mode press and hold cancel delete for 6 seconds

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Test 1 To Avoid further problems we
recommend you set the units up in test mode before
starting the heat pump.
Firstly in test mode run the pump, press blue set button and test button together for 6
seconds. The controller will display TEST. Immediately press the top left button to turn the
pump on and leave it running while in test mode.
When the pump is running a little house with a circle around it in the status window of the
controller.
The unit wants to see at least 16 l / min flow to activate
the flow switch, if there is not enough flow the unit will
never operate. You should have a flow meter installed,
if you haven’t now is the time to buy one.
If you look into the flow meter you can see the flow in
litres per minute. In this picture you can see a flow rate indicated, this shows 25l/min NOT
35l/min
If the flow rate is too low you need to fix this before moving on.
Check:
All valves are open. Including TRVs, underfloor heads etc. the heating 2 port zone valves
should also be open by default during this test.
The pump speed is set at highest, not fluctuating but at high constant speed. If you have a
small pump 15/50 or 15/60 this will almost certainly not be big enough.
There is no air in the system, hold the top of the flow switch, you can actually feel the paddle
moving back and forward and hear it rattling if there is air.
If you manually open the hot water 2 way valve check the flow rate again, if you can only
reach 16l with the heating and hot water open together it’s a sure sign the pump you have
installed is too small.
Once the flow rate is high enough move onto test 2 below (while still in test mode)
Test 2
Set up the bypass valve with radiators
In heating mode check the unit is pushing water into the radiator heating circuit only. Press
the std eco power button this closes valve 2. This valve is for zone 2 wired to B15 and B18.
Open the bypass valve fully, if you are not sure set it to its lowest setting. Now close every
radiator on the system except one.
Using the flow meter check the flow rate is above 16/l to avoid faults. Adjust the bypass valve
to achieve this. The bypass is set now open the rads again.
Set up the bypass valve with U floor heating
In heating mode check the unit is pushing water into the under floor heating circuit only press
the top right button this closes the valve is for zone 1 wired to B11 and B14.
Open the bypass valve fully, if you are not sure set it to its lowest setting. Using the flow
meter check the flow rate is above 16/l to avoid faults. Adjust the bypass valve to achieve this.
The bypass is set now turn up the wall stats again.
To exit service mode press and hold cancel delete for 6 seconds

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Caution in Cold weather
If the water in the system is below 10C the heat pump WILL NOT START.
Press the blue view button, you can see 4 sensor readings, press it until the pump symbol
shows (a circle round a house). This is the water temperature, if it’s below 10C the unit will
not start but the pump will run.
You must warm up the water to get the unit to run, the easiest way to do this is to run the
backup boiler in Test mode (page 12) to warm up the cylinder first, by manually cranking open
the HW valve you can prime the heat pump with the warm water coming back from the
cylinder.
Further cold weather cautions
If everything is cold less than 5C (the remote controller, the water, the tank etc.) the unit will
not operate correctly, it can’t understand how the house has got so cold. You will find the on
off button for heating won’t work and if you try to use HW mode it will switch itself off. You
need to allow the unit to warm up first. Make sure the remote controller is in a heated room.
Starting it up in heating mode:
If you have two port valves you should find the heating
valves are open and the hot water valve closed. If you
have a 3 port valve it should be open to heating mode.
Start the unit my Pressing heating on off button (top left
inside the door) to start the unit, set the mode to heating
(sun symbol)
Set the desired water temperature i.e. 50C using the up
and down buttons.
Once the unit starts, the pump will start immediately the
compressor will start after 3 minutes, you will see the symbol
for the compressor in the status screen. The pipework will
begin to heat up, check the flow temperature by pressing blue
view button once, the temp of the flow is shown next to a
symbol of a house in a circle. Over time this will warm up, now
check all the radiators or U floor loops are hot as well.
NOTE:
On the latest software if there is a problem with flow no error
shows for 10 minutes, it’s waiting for the air to come out the
system.
If the compressor (outdoor unit) fails to start this could be due
to flow problems. See next page

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E911 and compressor not running READ
THIS
When the pump is running a little house with a circle around it in the status window of the
controller.
The unit wants to see 16 l / min flow to activate the flow switch, if there is not enough flow the
compressor will fail to start, after a few minutes an E911
fault will show every 15 seconds
Check:
The flow rate on the flow meter it MUST be over 18l/min
The flow switch is connected to the PCB of the control box
The flow switch is round the right way you can turn the head, there is an arrow
All valves are open.
The pump speed is set at highest
There is no air in the system
There is water in the system
If none of this works you need a bigger pump or its air locked
If you think the flow switch is faulty, (it very rarely is) remove the paddle from the water by
undoing the red nut, you will need to block up the hole temporarily. Now run the pump system
again using the top left button, pressing it twice clears any faults. After 3 mins of pump
operation and holding the flow switch the outdoor unit will start, don’t rush the system it takes
time
If the flow switch is ok After 3 minutes the compressor / outdoor unit will start so the problem
is flow and possibly air / cavitation see below:
Rattling flow switch / Cavitation
E911 fault could be caused by a rattling flow switch. This can usually be heard but can also
be felt by holding the flow switch. To correct it use a screwdriver on the top of the flow switch
and turn the screw from 12 o’clock to 1 o’clock.
Alternatively you could also adjust the flow meter, use a pair of plyers on the top of the flow
meter and turn the ball-o-fix valve from 12 o’clock to 1 o’clock; this deflects the water flow &
should further reduce the rattle.
Flow meter in standard positioning:
Flow meter in 1 o’clock positioning:

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Field Settings
Field settings are what define how the unit is configured and how it will work, each system
can have very different field settings.
Many field settings will need to be made: NOTE the set button is the grey one not the blue
Field settings are in groups the 20s are for weather compensation and temperature control in
heating, the 30s are for the cylinder and the 40s are for backup boilers and hybrid systems.
Below are the field setting specific to your system as described in this book.
Enter field settings by pressing test for 6 seconds, 10 will show
on the screen
Scroll up to 20 using the silver up button, press set, 2011 will
show.
To adjust this setting press set again the setting will appear at
the top of the screen, adjust it with the silver up down buttons
and press set again, scroll up to the next field setting using the
up and down buttons and repeat.
When you have finished all your 20 settings press cancel delete
once, 20 will show on the screen, press the silver up button to
move to the 30s and repeat the procedure above.
When finished or if you get lost press cancel delete 2 x to return
to the normal screen
Note: if you set a field setting and go back to check it, it will not
have changed, the field setting do not get written to the PCB until you finish setting and exit.
Field settings to set see user manual for a full list
Field settings heating only hybrids
•2011 same setting as 4033 low ambient setting for optimisation
•2012 15 high ambient temp for optimisation
•2031 50C for rads 45C for Ufloor. Hi water temp for optimisation
•2032 37C lowest water temp for optimisation
•2092 1 for run signal from the stat
•4031 1 tells unit a backup boiler is present
•4032 1 tells unit to use backup boiler
•4033 3C changeover temperature from HP to boiler , system specific
A full list of field settings are in the installation and user manual which come with the outdoor
unit

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Operating the System in heating mode
using an external thermostat and / or a boiler run signal
from an under floor manifold.
You have now set the unit up to run from an external signal Using a field supplied room
thermostat or signal from an under floor heating system through B20-B22 and/or B20-B24;
the controller no longer drives the unit.
When the contact is made the unit will start and the water temperature will be controlled by
the heat pump, you will not have any control over it. The water temperature is determined by
the outdoor temperature; the colder it is outside the warmer the water. The unit is running in
weather comp mode,
You will see 0.0C on the screen; the unit
is using weather compensation function to
work out the water temperature. If you
need to boost the heating water temp this
can be done by pressing the silver up and
down buttons. This boosts the radiators by
up to +5 C but warning this will cost more
money to run.
When an external stat or run signal is used
most of the functions of the Samsung
remote are disabled. A waging finger
shows at the bottom to show this.
All these buttons are disabled and the functions they control are also disabled
Note: when the heating
command is sent to the unit it will not
start for 3 minutes. And when the
thermostat or signal is
removed the pump will run on for up
to 6 minutes.
On latest software the end user
can override the stat
switching the unit off with the top left
button. Avoid this as the unit will no
longer run. If the sun signal is not on
the display the heating is not going
to operate.

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Testing the backup boiler operation.
Using the field settings you have set the heat pump to heat the house when it is warmer than
3 C outside, below 3c the boiler takes over the heating.
You need to test this works
Start the unit operating in heating mode using the heat pump
On the back of the heat pump outdoor unit is a black temperature sensor, it looks like a tube;
you need to put this in a glass of ice and water to convince the unit that the outdoor
temperature has fallen.
Once it registers the temperature falling below 3C the heat pump will stop. A symbol of a milk
churn with a B in it will appear in the right hand side of the status window on the Samsung
remote controller.
A run signal should now be being sent to the combi boiler which should fire up, it should start
its pump and the 2 port valve for the combi should be open.
There may be a period of up to 6 minutes where the heat pump is also operating, please wait
and the heat pump will switch itself off.
Once this all works you need to warm up the temperature sensor on the back of the heat
pump to convince the unit to restart.
NOTE the heat pump wont restart at 3 C it restarts 3 degrees higher than the set temperature
so in this case at 6 C.

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Warranty Registration Card
Warranty MUST be registered within 30 days of delivery to
site. You must send proof of delivery with the warranty card.
Warranty will start from the date the unit is delivered.
All registrations made more than 30 days after this period will be rejected.
If commissioning data is not available at this time register the unit and send the data at a later
date, the warranty certificate will be returned to you when the whole form is completed.
This warranty covers only the Samsung components of the installation, it is parts with a pre-
set labour allowance only. The warranty is between Freedom Heat pumps and the installation
company only, this is NOT an end user warranty.
It is the role of the installer to offer a warranty to the end user covering all of the heating
system including the heat pump.
The standard warranty is valid for 12 months from date of delivery as entered on this card. If
the unit is installed by a Samsung approved installer and this card is sent back within 30 days
of delivery date the warranty is automatically extended to 36 months.
Approved installers also have access to warranty extensions at the time of registration for
warranty; a 4 year extension to the warranty can be purchased from your distributor or directly
from Freedom Heat Pumps.
Call 02380274833 for details and pricing
The warranty card can also be used as a maintenance card.

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Please return a photo or scan of this form and the delivery note to
warrant[email protected]k Once received we will confirm receipt and start of the warranty
period.
I accept the terms of the Samsung warranty and confirm the system has been registered
within 30 days of delivery. I also include a copy of the delivery note.
Signed Name