Midea M-thermal Mono ATW Heat Pump 4-6 kW Instruction Manual

Midea M-thermal Mono ATW Heat Pump 4-6 kW Instruction Manual

Preparing the unit

Remove the coil cover

When the unit is delivered there is a blue cover over the coil, please remove it, the remote controller is in a box at the back off the unit Remove the right hand front cover of the unit to gain access.

To gain access to the wiring, you will need to remove the 2 x 13mm bolts at the front to get the cover off, don’t loose them they MUST go back in.

Remove the compressor support

On the larger 8-12-14kw units, the compressor has a plate which haste be removed prior to installation, see above. Do not remove the metal frame the unit is bolted to, it is structural.

Where to install the unit

Unit Dimensions

Model| A| B| C| D| E| F| G| H| I| J
---|---|---|---|---|---|---|---|---|---|---
4/6kW| 1295| 397| 429| 760| 256| 105| 225| 792| 161| /
8/10/12/14/16kW| 1385| 482| 526| 760| 270| 160| 221| 945| 182| 81

Installing the Outdoor Unit (Boiler)

Position the outdoor unit so that the air flows into an open area, where there are no plants and animals. If the unit is to be installed within a mile of the sea you need to have the unit coated using Blygold, ask us for details. If you are applying for RHI and going through MCS you need to make sure the system meets MIS020.

Install the outdoor unit on a flat, stable surface, it needs to be securely mounted at least 100mm off the ground. You can use rubber feet under the unit if you want but its not essential.

The unit must have adequate drainage, it can produce up to 6 L / hour of condensate. If you are installing the unit at height you can install a drain pan under the unit but its best to let the unit drain into the ground.

The space around the unit is very important, allow:

300mm to the left hand side (facing the front of the unit),
300mm to the right of the unit,
300mm to the rear of the unit and 1500mm to the front of the unit.

Heating & hot water schematic

Heating & Hot Water

• Medea unit
• Feet Small
• Medea adapter 1 1/4” to 1 “
• 2x Fiber washer 1 1/4”
• 2x Fibre washer 1”
• 2x Flexi Hoses
• 8-16kW units )
• Rootkit ( only needed on
• 1x Pump
• 1x 28mm 3 port valve
• Filter Ball
• Glycol
• Header
• 32A Isolator
• 2x Electric Meter Optional
• Cylinder
• Immersion Timer
• Delivery
• Install Manua
  

Every system will have a low loss header (buffer or plate heat exchanger) in the heating circuit, there are no short cuts.
If you install the unit with no low loss header, you will void the warranty.

Piping the unit

The water connections are flow at the top and the return at the top bottom, they are 1 1/4” male, we will deliver it with an adapter to 1” male and will supply flexi hoses to fit. You must use 28mm copper or plastic pipe to connect the unit .
The pump in the unit is strong enough to push the water a maximum of 12m each way to the hot water cylinder and The low loss header. If your pipe length is more than 12m of 28mm copper please call us first.

4/6 kW

Wiring Schematic

Wiring Schematic

• SV1, the 3 port valve connects AB to A when there is no power. The valve must be installed with A to House and B to the cylinder.
• SV1 powers AB to B for hot water mode
• A to house
• B to cylinder
  

Note the immersion heater is not connected to the heat pump. You need to connect it to an externally powered time clock programmed to do a 1 hour legionella cycle every week (or day).

Wiring Schematic

The 3 port valve SV1 wires from 5 live to 16 Neutral If the valve is installed backwards terminal 5 and 6 are the opposite of each other swap wire from 5 to 6 and the valve will reverse.
The heating run signal wires from 3 to 15. The unit sends out 240V AC on terminal 15 when you send it back on terminal 3 the unit runs in heating mode. Pump Po heating pump after the header is wired into 10 live and 22 Neutral.
The remote controller can be wired in Cat 5 cable up to 20m long The blue hot water cylinder sensor is delivered 10m long, it can be extended to 20m long with 1mm 2 core flex.

How it’s going to work

Space Heating

The heat pump has its own inbuilt weather compensation system, it will look for a heating run signal from an external thermostat or under floor heating system (field supplied). The unit sends out 240V AC on terminal 15 when you send it back on terminal 3 the unit runs in heating mode. This will come from your underfloor heating system or your heating zone valves after the header.

Room thermostat

• 15 is live
• 3 is heat run signal 240V AC
  

Domestic water heating

The target tank water temperature is set on the Medea remote controller. The Medea unit will decide when to go into HW mode it will stop Pump Po (heating pump) the 3 port valve SV1 will power open.

3-way valve SV1

Secondary heating pump P0

Running the unit for the first time

Before power up

Filling it with water

Connect the water supply to the fill valve and open the valve. Make sure the automatic air vent is open, its in the outdoor unit inside a rubber cover top right hand side of the unit .
Fill with water pressure of approximately 2.0 bar. Remove air in the circuit as much as possible using the air purge valves. Air in the water circuit will cause flow errors EO and E8.

Setting up the cylinder immersion heater

To insure the unit has adequate legionella protection the immersion heater will run for 1 hour a week controlled by an external timeclock. It will run the immersion heater make sure the internal thermostat on the immersion is set as high as possible 60°C.

Turn all thermostats down and underfloor heating off, before you power up the heat pump.

Power up the unit and look at the display on the outdoor unit PCB.

In the middle of the main PCB inside the right hand casing there is a red 3 digit display, it will light up and show the current water temperature. If nothing is displayed check the power supply to the unit. Once it is lit up check the remote controller.

On the screen of the remote controller it will count to 100, then it will ask you which language to use, select EN press OK. If you wait 60 seconds it will just select English as default.

If the error code E2 is displayed on the controller check the wiring between the remote controller and unit. Redo the wiring and reset the power.

Field settings

Initial setup

DO NOT SKIP THIS SECTION

The unit is delivered as a completely blank slate, it does not know you want to use a hot water cylinder or that you are using an external heating run signal. So if you just switch it on and leave you will be back to do the job properly.

The controller will look like the image to the right.

• Press and hold the UNLOCK button for 3 seconds
• Press MENU press caret-down 8 times to SERVICEMAN, press OK
• Enter password 234 press OK
• Go to DHW MODE setting, press OK
• IN DHW mode press caret-right then caret-up change it to YES press OK
• Go to DISINFECT press caret-right then caret-down to NON press OK (legionella is handled by an external immersion and time clock)
• Go to 1.18 DHWHPMax and set to 60 for 200L tank or 90 for 300L tank press OK
• Press BACK
• Go to Heat Mode setting press OK
• Go caret-down to 3.8 T1setH1 press right set to 55°C for Rads or 45°C for UFH press OK
• Go caret-down to 3.9 T1setH2 press right set to 37°C press OK
• Go caret-down to 3.10 T4H press right set to -2°C press OK
• Go caret-down to 3.11 T4H press right set to 15°C press OK

This is the setting for your weather compensation for heating the water will be 55°C at -2° ambient and 37°C when its 15° ambient.

• Press BACK
• Go caret-down to 6 Room thermostat, press OK
• Go to 6.1 Room thermostat press caret-right change to one zone
• Press OK
• Press Back 2 times.

You have now told the unit it has a remote thermostat, its got weather compensation and it has a hot water cylinder.

Now you have to test to see if its tubed and wired up OK.

Field settings

Test Run

TEST RUN is used to check correct operation of the unit
Go to MENU caret-right FOR SERVICEMAN caret-right enter password 234 OK, go caret-down to
11.TEST RUN. Press OK. The following page will be displayed:

Select YES press OK

Select POINT CHECK press O

Go to 3 way valve 1 press on off button the valve will move from heating to DHW

Go caret-down to Pump I (pump in the heat pump) press on off, it will start, you can see a green led on the front of the pump when its running.

Go to Pump O this is the pump after the low loss header, it will be pumping out to the heating circuits.

When you are happy all of these work OK press BACK

If you want to force the heat pump to run go to 11.5 heat mode running, the unit will show

After 6 minutes the compressor will start and it will heat up the water. Note at this point the unit does not know what the valves are doing so it will heat wherever the water is flowing. It should go to the header, if it goes to the hot water cylinder the 3 port valve is wired backwards swap the live cable from 5 to 6 (power off first).

To exit this mode press Back a few times to get to the normal front screen.

Field settings

Restore Factory Settings

If you mess up the controller you can restore it to factory.

The RESTORE FACTORY SETTING is used to restore all the parameters set in the user interface to the factory setting.

Go to MENU caret-right FOR SERVICEMAN caret-right 10.RESTORE FACTORY SETTINGS. Press OK. The following page will be displayed:

Press caret-left caret-right to scroll the cursor to YES and press OK. The following page will be displayed:

A glance of the user interface

Starting the unit

Unlock screen

If the lock icon is on the screen, the controller is locked.

The following page is displayed:

Press any key, the lock icon will flash. Long press the ‘’UNLOCK’’ key.
The   lock icon will disappear, the interface can be controlled.

Setting the clock and date

• Press MENU, press caret-down 6 times to SERVICE INFO press OK
• Press caret-right 3 times to DISPLAY press OK
• Go to TIME press caret-right then use caret-up and caret-down to set the time hoursand minutes, press OK
• Go to DATE press caret-right then use caret-up and caret-down to set the day and month, press OK
• Go to Buzzer press ON / OFF to silence the noise from the controller.
• Press back a few times to get to the front screen

Starting the unit in heating mode

Press caret-left to highlight the left hand side of the controller this is the heating side, press ON / OFF

The middle of the controller tells you what is happening now. In this case heating (the sun) is on, so the thermostats are calling. The unit will start the pump in 2 minutes and the compressor in 5 minutes.

Check the pipework is heating up and the header is getting warm. MAKE SURE there is no hot water going to the cylinder.

Note if you try to change the water temperature or turn the heating off a message shows. This unit is controlled from an external run signal and operates using the water settings for weather compensation you set earlier.

Starting the unit

Go back to the front screen, press caret-right to highlight the right side of the controller. This is the hot water setting.

When you highlight the DHW it tells you the DHW set temperature, when it’s not highlighted it shows the current DHW tank temperature. With it highlighted press ON / OFF the unit will start heating the cylinder

Note how the middle of the controller is now showing the tap to indicate its actually heating the tank.

Operational data

Operational data for testing the unit

This menu is for installer or service engineer reviewing the operation parameters. Here you can see everything the unit is doing with tools.

• At the home page, go to MENU caret-right OPERATION PARAMETER.
• Press OK. There are six pages for the operating parameter as following. Use caret-up and caret-down to scroll.

Trouble shooting

All error codes are listed in the installation and owners manual at the back pages 70-76.

If the remote controller shows “E8” or “E0” as an error code, there is a possibility that there is air in the system, or the water level in the system is less than the required minimum.

Freedom Heat Pumps

Who are Freedom Heat Pumps?

Freedom Heat Pumps is a wholesale distribution company for air source heat pumps and underfloor heating systems.

We offer technical support, training, design and consultancy services Freedom Heat Pumps was founded in 2010 and have been market leaders in this sector with over 7500 units out in the field.

How we work

Our approach is very straightforward. If you have a set of plans or an outline of the requirements for a project, send them tosales@freedomhp.co.uk. From there, we will produce a heat loss calculation in line with today’s standards, and put together a list of the kit required at your cost price.

Alternatively, if you don’t currently have a heat pump project, but would like to become a heat pump installer, and don’t know where to start, contact us on 02380 274833 or email us at sales@freedomhp.co.uk and we can set you on the correct course.

@freedomheatpumps
@freedom heat pump
 Freedom Heat Pumps Ltd.
freedom heat pumps
www.freedomhp.co.uk

Freedom Heat Pumps Ltd

Head Office
Unit 2 Warrior Park,
Eagle Close
Chandlers Ford,
Hampshire
SO53 4NF

Northern Office
Unit 5, Roundhouse Court,
Bucksaw Village,
Chorley,
Lancashire
PR7 7JN

Tel: 02380 274 833
Email: sales@freedomhp.co.uk
www.freedomhp.co.uk

Copyright © 2020 Freedom Heat Pumps Ltd. All rights reserved. Specifications and designs are subject to change without notice. Non-metric weights and measurements are approximate. All data were deemed correct at time of creation. Freedom Heat Pumps Ltd is not liable for errors or omissions. All brand, product, service names and logos are trademarks and/or registered trademarks of their respective owners and are hereby recognized and acknowledged.

References

• The UK's Leading Heat Pump Supplier | Freedom Heat Pumps

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