Samsung RC090MHXEA Installation Manual page 14

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.
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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
©G Hendra September 2014 14