Samsung RC090MHXEA Bedienungsanleitung

www.freedomhp.co.uk ©G Hendra Nov 18

This is the Freedom Heat pumps service manual for Samsung

air sourced heat pumps from 2010 – 2015.

Its all the work of Freedom Heat Pumps, if you like it and

would like a version for the current units you need to come on

service partner training click here.

https://www.freedomhp.co.uk/training/

Samsung Eco Heating System 2010-15

Service Manual

Model Numbers:

RC090MHXEA and RC160MHXEA

www.freedomhp.co.uk ©G Hendra Nov 18

Self-Test mode

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 and test run will be activated.

Put the controller back on the wall.

www.freedomhp.co.uk ©G Hendra Nov 18

Exit test mode – hold the Cancel/Delete button for 6 seconds to go back to normal display

Operation Button Display

Enter test mode – hold Blue set button and the Test button together for 5

seconds

Run the water circulation pump (B6 live) – Press the Heating on/off button

Run the Backup heater/boiler (B2 live) – press the Mode button (Heating)

Run the immersion heater (Terminal A3&A4) – press the Weekly button

Run the Hybrid Boiler (B4 live) – press the Set button

Open the Hot Water Zone Valve (B8 live) – press the Lock Button

Open valve for heating Zone 1 (B12 live) – press the DHW on/off button

Open valve for heating Zone 2 (B16 live) – press the Mode button (DHW)

Show 5 temperature sensor values in order – press the View button.

Return temperature

Flow temperature (From heat pump)

Flow temperature (From hybrid boiler)

Hot water cylinder temperature

Temperature of the inside of the house

Run signal coming back from heating zone 1 thermostat into terminal B22

Run signal coming back from heating zone 2 thermostat into terminal B24

www.freedomhp.co.uk ©G Hendra Nov 18

On the main

MIM control

PCB there are

7 orange leds

above the

relays

When lit:

Led 500 immersion heater A4 live Led 501 backup heater stage 1 B2 live

Led 502 backup heater stage 2 B3 live Led 503 backup boiler (hybrid) B4 live

Led 504 pump running B6 live Led 505 Hot water valve open B10 Live

Led 506 Zone valve 1 closed B14 off Led 507 zone valve 2 closed B18 off

www.freedomhp.co.uk ©G Hendra Nov 18

What makes the unit go?

When operating the unit measures the water flow and return temperatures across the

outdoor heat exchanger. T/S 2 and T/S1 in the diagram below.

If the delta T (temp difference across T/S1 and T/S2) is 5 degrees C the unit is

happy, this is its main control feature.

If T/S 2 (flow) is less than 5 c above T/S1 (return) the unit is providing too much heat

so the compressor will slow down reducing capacity.

If T/S 2 (flow) is more than 5 C above T/S1 (return) the unit needs to work harder so

it will rev up.

www.freedomhp.co.uk ©G Hendra Nov 18

Interogating the outdoor unit

Using the 4 buttons at the bottom of

the main PCB on the outdoor unit

PCB you can run the units in test

modes

Normal display Is flashing between

AdFO-0000-

Button K3 resets the unit, it’s a quick way of resetting the power.

By pressing button K4 you enter the service mode, here you can monitor the units operation.

Note there are 16 pieces of data, one for each time you press the button K4, to exit press K3.

www.freedomhp.co.uk ©G Hendra Nov 18

My unit seems to be struggling and is freezing up?

In cold weather we get reports that units are freezing up excessively or the unit is not

achieving high enough radiator and floor temperatures:

This can be caused by the unit having a fault or it not being big

enough for the job.

Firstly, we will test if the unit is working ok:

First draw off 30 liters of water from the cylinder, run a couple of

taps for 5 mins to achieve this.

The heat pump should be able to achieve a 48C flow temperature

without using the immersion heater if it’s working ok.

If it’s struggling to reach the 48C it might be a refrigerant or a flow

problem

Note it takes the tank much longer to heat up than normal, especially when the tank

temperature is high. And it takes a lot more power to do this.

If the unit can meet the tank temperature the heat pump is ok. Now we have to make some

more tests.

If its struggling to heat the house firstly take field setting 2091 and 2092 out of the system set

them to 0. Now running the unit at a constant temperature test the unit at a 50C flow

temperature. If it can’t make 50 C against the heat pump is probably not big enough.

To prove this if you close of half of the heating circuit you will see the flow temperature can be

met. If this happens you need to get out your heat loss calculation and check it’s been done

correctly.

The next thing to check is the flow rate. If the flow rate is low the unit will not achieve its

maximum potential. Size 16 units need 30l/min, size 9 units need 20l/min.

If the unit can’t make 48C flow you need to do a performance

test, this is done using the service partner tool excel.

Call our office 02380 274833 with the following info:

Unit model and serial number

The flow and return temperatures

The flow rate

Using outdoor unit function (press k4) see page 2

No 2 compressor speed and no 5 compressor outlet temperature.

www.freedomhp.co.uk ©G Hendra Nov 18

Also see E231 it could be the coil sensor reading a high

temperature.

Not enough hot water

If it is reported that the temperature of the hot water is too low a few

tests need to be made.

Make sure the tank sensor is in the pocket 1/3 of the way from the top

of the cylinder, it must be above the immersion coil.

The tanks sensor

needs to go 115mm

into the tank into one

of the pockets inside,

it must be clipped so

it can’t pull out.

Make sure the tank temperature is set to 48C on the remote

controller, press blue set button until the tap symbol appears

and set it to 48C with the silver up button.

Press the blue view button you can see 4 sensor readings,

press it until the tap symbol shows. This is the tank

temperature. It will display for about 10 seconds.

Using your own temperature probe test at the same point to

see if the sensor is reading accurately.

Now run a hot tap:

The temperature coming out of the top of the tank and the

temperature coming out of the tap and shower should be the

same. if not check for mixers, no insulation or plumbing

problems

www.freedomhp.co.uk ©G Hendra Nov 18

Legionella protection

Legionella

The legionella function operates the immersion heater in the hot water cylinder once a week

or every day to disinfect the hot water tank.

We normally encourage engineers to set the legionella function to start at 3 am on Tuesday

morning and to heat the tank to 60C for 10 mins. This is adjustable in the field settings

How it works

When the legionella timer (in the unit) starts the immersion heater is

used to heat the cylinder, the heat pump stops operating. Note the

legionella symbol shows but there is no pump symbol.

Legionella can be adjusted in the field settings:

Setting 3041 turns legionella on and off, NEVER turn it off

Setting 3042 tells us the day legionella will happen; you can choose

any day or every day.

Setting 3043 is the time legionella will start

Setting 3044 is the temperature the unit wants to see in legionella mode set it to 60C

Setting 3045 Duration is how long the heater continues to operate once the temperature in

3044 is met.

When it goes wrong

Legionella function only ends when the tank reaches the legionella set point.

If the immersion heater trips or is switched off the unit will gets locked in Legionella function. It

won’t heat the house or the hot water cylinder.

How can I get the unit to heat if it is stuck in legionella?

To restart the heating, you must switch off and on the hot water function press top right button

2 times.

Checking the immersion heater

To test the immersion heater, use the test mode on page 2

To access service mode press blue set button and test

button together for 6 seconds. The controller will display

TEST.

Press weekly to test the immersion heater in the hot water

cylinder

Test the current of the heater using an Amp clamp; this

measures the total amount of current. It is important to only

measure the current in 1 wire at a time. It should pull 13 Amps

The Gledhill tank has an immersion heater with its own stat;

this MUST be set 10 degrees above the legionella set point.

There is a cut out (black button) in the centre of the immersion

heater this must be pushed in to operate.

www.freedomhp.co.uk ©G Hendra Nov 18

The Operation of the HW cylinder

The operation of the HW cylinder is as follows:

Factory set, if the hot water set temperature is set to + 48C the unit will start heating the

cylinder when the temperature drops 5C below set point (43C), it will heat the cylinder until 2

degrees above set point or 50C.

The dead band can be adjusted using settings 3022 (2) to adjust how far over the set point it

heats too and 3023 (5) how many degrees the tank temp has to fall before hot water mode

starts.

There is a minimum operating time in HW mode of 5 mins, this can be adjusted in setting

3024. If the HW is switch on and then off again it will operate for this minimum period in HW.

The maximum operating time in HW mode is adjusted using setting 3025. For example, if HW

mode starts and setting 3025 is set to 30 minutes, the hot water mode will end IF either the 30

mins is reached or the set point is reached, whichever happens first.

Normally we set the max time to 60 mins for a 300L cylinder. But beware if we are heating the

cylinder we can’t heat the house at the same time.

If the cylinder has completed a HW cycle if cannot return to HW mode for a preset time

period, it’s measured in ½ hour segments,

and set in 3026. The factory setting is 3 = 90

mins. So the operation is like this:

Tank drops to 43C, HW mode starts, tank

temperature raises but after 30 mins it has

not reached set point, HW ends and heating

resumes. The tank is still not warm enough

but the unit will heat the house for 90 mins

then return to the tank for 30 mins and so

on.

None of the timers are used if there is no Heating demand, in this case the unit can heat the

tank 24 hours a day.

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