Freedom RASM Series Manual

Air Source Heat Pump
Installation and Maintenance Manual
Model Numbers
RASM Monoblocs
RWM Splits
RWD Combi (pre-plumbed)
RWH High temp

2 3
Contents Freedom Heat Pumps
Who are Freedom Heat Pumps?
Freedom Heat Pumps are a wholesale distribution company for the Samsung EHS and the Hitachi Yutaki range of heat pumps and
underfloor heating systems. We offer technical support, training, design and consultancy services and operate the
www.samsungehs.co.uk and www.freedomhp.co.uk web sites and freedom heat pumps and Hitachi Yutaki Facebook pages.
We launched Samsung’s eco heating systems in the UK in 2010 and have been market leaders in this sector with over 5000 units out in
the field. In 2016 we started distributing Hitachi’s Yutaki range of units to expand our heat pump portfolio and market influence.
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 to
[email protected].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 [e-mail] and we can set you on the correct course.
Homeowners
If you are the homeowner please ask your installer for the pdf homeowner manual or download it at www.freedomhp.co.uk. Scroll to
the bottom and click the link for end user manual. It shows how the unit should be used and how to get the best from it.
Freedom Heat Pumps 3
Underfloor Heating 4
Hitachi Warranty Registration 7 Year 5
Handover of the System 7
Maintenance 12
Installation 13
Monobloc Installation 14
High Temperature S80 Installation 18
Combi Installation 23
Split Installation 28
Start-up procedure 33
Remote controller set up first time 34
What the Unit Comes With and What You Will Need 38
Wiring and Power Supply Information, All systems 40
How To Wire The Electric Meters 42
Special systems and extra settings 43

4 5
Hitachi Warranty Registration 7 YearUnderfloor Heating
If you are looking for an underfloor design which we guarantee will have the heat pump at the centre of the system design,
instead of as an add on, come and talk to us at Freedom HP.
All Hitachi heat pumps can now be registered for a 7-year parts warranty, covering only the Hitachi components. Any labour charges
for replacing faulty parts are not covered. The Hitachi warranty does not cover, radiators, cylinders, UFH, valves, pumps etc. It is the
role of the installer to offer a warranty to the end user covering the heating system including the heat pump. Your installer may offer
you their own full parts labour and call out warranty as part of their maintenance agreement, but you need to discuss this with the
installer / maintenance company. The warranty will be held by the end user at the address the unit is installed. It is important that
a qualified engineer services the unit annually to maintain the warranty . It does not have to be the installer who does this, we can
recommend engineers to do this if the installer does not want to do this work.
Your unit is not automatically registered for warranty, your installer needs to fill in a form Online at www.freedomhp.co.uk.
Once this is done a certificate and a maintenance book will be emailed to the applicant, please make sure you have a copy of this
certificate, and proof of maintenance. Hitachi may ask for this when a warranty claim is made.
Installation Details
Your Name
Your email address
Outdoor model number
Outdoor serial number
You will find this on the side of the heat pump
Indoor unit model number
Date commissioned / /
Name of Homeowner
End user email address
This is where the warranty certificate will be sent by Samsung
Installation address
Post code
Installation Details
Company name
Engineers name
Office telephone number
Is this your first Hitachi install? YES / NO
Date commissioned
Will you or your company
be maintaining the Unit? YES / NO
If No, Freedom Heat Pumps will advise of an engineer who
can do this
Install Photos
Please take at least 6 photos showing the outdoor unit, control
box and cylinder cupboard
Pipe
We supply a high quality 16x2mm
multilayer pipe, consisting of 5 layers of
polyethylene, adhesive and aluminium.
Typically rated at 95°C at 10bar, this
strong flexible pipe is well suited to
underfloor heating, and is manufactured
within the EU.
Controls
At Freedom we provide a wide range of
controls manufactured by leading brands
such as Heatmiser, Danfoss and Reliance.
On offer are basic dial thermostats to
the latest digital phone app controlled
products.
Manifolds
Our brass manifolds are made in
Germany, and are supplied to us by Watts
Industries. This premium product has
individual flow meters, isolation ball
valves, and is fitted with an auto air vent
and pressure gauge to aid testing.
Plate Systems
Our plate system is generally used for a suspended floor. Insulation should be fixed
flush with the top of the existing joists to prevent downward heat loss. Battens are
fixed at 400mm centres at 90° to the existing joists. Aluminium trays are then laid
and stapled into position and the underfloor heating pipe is pressed into the grooves
within the trays.
The pipe warms the trays and the heat is spread across the floor. Chipboard or
plywood can then be laid and fixed to the battens.
Overlay Systems
Overlay panels provide many advantages over other insulation products when used
with warm water underfloor heating systems.
Our panel dimensions are 1250mm in length by 350mm in width and either 20mm or
25mm high.
Screed Systems
A Screed System is where the underfloor heating pipes are incorporated within
the solid floor structure. Staples, interlocking cliprail or castellation mats are
fixed directly on to the floor insulation. At Freedom Heat Pumps, we can provide
everything from staples to cliprail through to castellation mats in order to suit your
project.
Quotations are provided without obligation, and a fully insured BS1264 compliant AutoCAD pipe layout can be prepared prior to
delivery and installation. This affords the client an opportunity to approve our suggestions prior to final acceptance.
Do you have a project which you would like us to provide a competitive underfloor heating quotation for?
If so, please email [email protected]o.uk or call 02380 274 833

6 7
Header,
Buffer or
Heat
Exchanger
Pump Z1 Z1
Z2
The 3 port valve MUST go
A to DHW and B to Heating
Flow & Return
at Heat Pump
Return from
Header
Return from
Heating
Flow out of
Header
Flow into
Header
Handover of the SystemHitachi Warranty Registration 7 Year
Heating Mode Commissioning Data
It is useful to take these measurements at commissioning and testing. They are for your own records, they are not needed to register
the unit for warranty.
What type of system do you have? Pre-plumbed / Separate Cylinder
Is there a Header, Buffer or Heat Exchanger installed?
Measure the following and record the data:
Flow temperature at Heat Pump
Measure with pipe thermometer
Return temperature at Heat Pump
Flow temp into header / plate
Return from header / plate
Flow temp out of header /
plate to heating
Return from Heating into
header / plate
Flow rate from flow meter
Air temp at the back of the unit
Ambient air temperature
Measure from the garden
Hot water cylinder model No.
Cylinder water temp at start-up
Measure from the remote controller
Cylinder water temp after 30mins
Measure from the remote controller
Water flow temp at cylinder
Measure with pipe thermometer
Water return temp at cylinder
Measure with pipe thermometer
Flow Rate
Measure from the flow meter
Hot Water Mode Commissioning Data
You must be running the heat pump in hot water mode for this section
Leave these 5 pages with the Homeowner.
Search Freedom heat pumps, Handover video for Hitachi heat pump on YouTube
Thank you for buying an Hitachi heat pump system, your Hitachi heat pump heats the house and hot water cylinder much like a
normal fossil fuel boiler, however there are a couple of differences which you should take notice of.
Your installer should have provided you with a room thermostat if you have radiators or a thermostat in every room if you have under
floor heating. They will tell you how to use these stats. The heat pump will run when it gets a run signal from the thermostat. It is not
controlled by the Hitachi remote controller.
To turn on the heating all you need to do is turn up the thermostats, to turn it off you need to turn them down. The thermostat sends
a run signal to the heat pump. Once the unit starts up it will take time to get to temperature, it is not instant. Within 10 minutes you
should feel the radiators beginning to warm up
Weather compensation
The radiator temperatures will be lower than you are used to with a gas or oil boiler. To add to this, we run them in a weather
compensation mode, this means that the unit measures the outside temperature and adjusts the radiator temperature to suit.
The colder it is outside the warmer the rads will be and vice versa. This function is automatic and is designed to save you money. In
very cold weather the radiator will be at their hottest, they will reach 50°C, its possible to get to 80°C if you have an HT system.
Running your machine efficiently
It is very expensive to heat the house up from cold, with a heat pump the best advice is to maintain the house at as close to constant
temperature as possible all the time.
Please DON’T set the room temperature too low when you leave the house, ideally drop it 2 degrees below your normal set
temperature when you go out or it will take a long time and a lot of money to recover.
To switch off the heating in summer set the thermostats down to 16°C to avoid the heating starting up.
Your radiators will have thermostatic valves on them, you can adjust each room’s temperature with these.
Water temp in weather comp mode
Ambient temperature °C
Flow temperature °C
-5
35
55
50
45
40
0 5 10 15

8 9
Handover of the System Handover of the System
General Advice
The heat pump comes with a controller which looks like this,
you should not use this or press the buttons, it is used for
commissioning and fault diagnosing the system.
On you tube (search for freedom heat pumps) there are videos
showing how to use the controller, faults etc.
If the system goes into fault, the screen will show a number at
the bottom starting with A, for example A020. The green light will
go out and a red light will flash. The engineer will want to know
this number when you call.
Please avoid turning the unit off at the power supply especially
in cold weather. If the unit is off and the weather is very cold, it
cannot protect itself and your warranty will be at risk.
Hot Water
Scroll right highlight DHW, press power to turn DHW on. Press up to set the temperature of the cylinder typically 55°C for a low temp
and 70°C for a high temp unit
The unit it set up to maintain the water between 43 and 50°C all the time.
As you use the water the heat pump will constantly top up the cylinder. The hot water cylinder has priority over the heating, if the
cylinder temperature falls 5 degrees below its set point the unit will automatically switch to heating the cylinder. This should take less
than an hour.
Once set temperature is achieved the unit will go back to heating the house. The hot water cylinder loses almost no heat (1/3 a degree
an hour) if no hot water is used.
An anti-legionella / disinfection operation will be completed at a 3am every Wednesday morning. The unit will heat the cylinder with
the immersion to 60°C, the hot water will be hotter on a Wednesday morning than the rest of the week.
If you don’t require 24/7 hot water It is possible to time clock the hot water to reduce costs, the timer video on you tube will show you
how to do this.
Location Function
1Liquid Crystal Display
Screen where controller software is displayed.
2OK button
To select the variables to be edited and to confirm the selected values.
3Arrow Keys
It helps the user to move through the menus and views.
4Run/Stop button
It works for all zones if none of the zones is selected or only for one zone when that zone is selected.
5Menu button
It shows the different configuration options of the user controller.
6Return button
To return to the previous screen.
7
Favourite button
When this button is pressed, the selected favourite action (ECO/Comfort, Holiday, Simple timer or DHW boost) is
directly executed.
OK
2
1
3
4
5
7
6

10 11
Common Icons Icons for the comprehensive view
Icon Name Values Explanation
OFF
Status for circuit 1, 2, DHW
and swimming pool.
Circuit I or II is in Demand-OFF
Circuit I or II is on Thermo-OFF

outlet temperature

outlet temperature

outlet temperature
Mode
Heating
Cooling
Auto
88 Setting Temperatures
Value Displays the setting temperature of the circuit 1, circuit 2, DHW and
swimming pool
OFF Circuit 1, Circuit 2, DHW or Swimming Pool are stopped by button or
timer
Alarm Existing alarm. This icon appears with the alarm code
Timer
Simple timer
Weekly timer
Derogation When there is a derogation from the configured timer
Installer Mode Informs that user controller is logged on the installer mode which has
special privileges
Menu Lock It appears when menu is blocked from a central control. When indoor
communication is lost, this icon disappears
Outdoor Temperature The ambient temperature is indicated at the right side of this button
Icon Name Values Explanation
Pump
This icon informs about pump operation.
There are three available pumps on the system. Each one is
numbered, and its corresponding number is displayed below to the
pump icon when it is operating
Heater step Indicates which of the 3 possible heater steps is applied on space
heating
DHW Heater Informs about DHW Heater operation. (If it is enabled)
Solar Combination with solar energy
Compressor
Compressor enabled (For YUTAKI S, S COMBI and M)
Compressors enabled.
1: R410A / 2: R-134a (For YUTAKI S80)
Boiler Auxiliary boiler is working
Tariff Tariff signal informs about some cost conditions of the consumption
of the system
Defrost Defrost function is active
Central/Local
- No icon means local mode
Central mode (Three types of control: Water, Air or Full)
Forced OFF
When forced off Input is configured and its signal is received, all the
configured items on the comprehensive view (C1, C2, DHW, and/or
SWP) are shown in OFF, with this small icon below
Auto ON/OFF When daily average is over auto summer switch-off temperature,
circuits 1 and 2 are forced to OFF (Only if Auto ON/OFF enabled)
Test Run Informs about the activation of the “Test Run” function
Anti-Legionella Activation of the Anti-Legionella operation
DHW boost It activates the DHW heater for an immediate DHW operation
ECO/Comfort mode for
circuits 1 and 2
- No icon means Comfort mode
ECO mode
Handover of the System Handover of the System

12 13
InstallationMaintenance
The Hitachi heat pump should be maintained at least once a year to comply with warranty and RHI.
You must log your maintenance at www.freedomhp.co.uk for the 7-year warranty.
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
Install the outdoor unit on a flat, stable surface, the unit needs to
be securely mounted at least 100mm off the ground on rubber
feet. The unit must be bolted down for security using 10mm bolts
and Zebedee’s.
The unit must have adequate drainage away from the unit; 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.
There is an optional draining kit, see picture, which you can use
but we recommend draining straight into the ground.
Dimensions Split:
Size 2 - 600mm (h) 792mm (w) 300mm (d) 46kg
Size 3 - 800mm (h) 950mm (w) 370mm (d) 49kg
Size 4, 6, 8 and 10 - 1380mm (h) 950mm (w) 370mm (d) 116kg
Dimensions Monobloc:
Size 3 - 800mm (h) 1252mm (w) 370mm (d) 115kg
Size 4 - 1380mm (h) 1252mm (w) 370mm (d) 135kg
Size 6 - 1380mm (h) 1252mm (w) 370mm (d) 144kg
The space around the unit is very important, allow:
300mm 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.
300 or more
300 or more
1500 or more
600 or more
Hot Water Cylinder
Check electrical connections & check the tank temperature sensor is above
the immersion heater and fixed properly and the overheat thermostat is set
to 70°C. On a Telford cylinder set the stat to 5.
Maintenance procedure
Stop the unit, clean the water strainer in the unit you need a spanner and circlip pliers for this.

have a glycol tester a glycol tester / refractometer can be bought from your heat pump supplier or online.
Refill the unit, pressure should be 1.5 bar,
We need to test the operation of the unit against the hot water cylinder. So first we need to draw off 50 liters of water, run a couple
of taps for 5 mins to achieve this. The unit should start up automatically in hot water mode, if it doesn’t on front screen scroll left
highlight Heating press power to turn this off.
Scroll right highlight DHW press power turn DHW on. The unit should now run in DHW and open the 3 port to the cylinder,
To test cylinder and flow temp press menu, operational information ok, select DHW ok all temperatures are listed. Log the
temperature of the flow, the flow rate, the temperature of the air as it enters the coil and the temperature of the air in the garden.
The heat pump should be able to achieve 50°C cylinder temperature without using the immersion heater. While running, check the
outdoor unit for damage & debris, the coil needs washing, we recommend you use an approved heat pump cleaning chemical, your
distributor will stock this. Instructions are given on the bottle. You also need to clean and polish the outside casing we recommend
car wax to do this
OUTLET OUTLET
INLET INLET
Ball in closed position Ball in cleaning position
Ball ready to clean-cut
with flush. An extra 22º is
needed to rotate the ball.
At this position, the mesh
can be removed from the
filter ball for maintenance
tasks
Drain Pipe
Extruded Portion
Drain Boss
Rubber Cap
Drain hole of Base

14 15
Monobloc Installation Monobloc Installation
Installing the indoor (mirror) box
The tank sensor and controller come as accessories
Install the control unit indoors, it’s not waterproof. It needs to be sited within
75m of the hot water cylinder, less than 100m from the outdoor unit.
The box is 360mm wide, 490mm high, 100mm deep.
Note the pump in the Monobloc can only manage a run of 10m at 28mm
diameter copper each way to the header or cylinder.
Header,
Buffer or
Heat
Exchanger
Pump Z1 Z1
Z2
The 3 port valve MUST go A to DHW and B to Heating
Flow & Return
at Heat Pump
Return from
Header
Return from
Heating
Flow out of
Header
Flow into
Header
Heating and Hot Water Systems Monobloc
360
490

16 17
Pump Z1
Remote
Controller
Heating run
signal from
stat or ufh
3 port Monobloc
split and ht only
Comms to
Outdoor Unit
Power
16 Amps
Immersion Heater 13A
Cylinder sensor
up to 75m long
2 Core flex
0.75mm
Monobloc InstallationMonobloc Installation
Wiring Diagram Monobloc ( PCB in the Mirror Box )
Power the Hitachi system needs 2 power supplies Immersion heater is connected to 31 Live and 30 Neutral; Communication cable connect to the control box, terminals 1 and 2. Remote controller connect to 3 and 4. Cylinder sensor connect this using 5 and 6
Run signal, 13 is permanently 240V ac. The run signal goes into 14. Remove the link. Pump Z1 Live 14 and Neutral 34 on a combi wire live to 36 3 port connect live to 32 and Neutral to 34 the orange and grey wires are not used. If a low loss header or buffer is used you can connect a buffer sensor in 8 and 9
Before power up
Monobloc Dip Switches when using mirror box
In the outdoor unit on the right hand pcb, set DSW 4 Pin 1 up to
activate indoor unit wiring box. You also need to set SSW1 to Local
push it down (Instead of remote)
On the Monobloc, mirror box / indoor unit make sure DSW2
switches in the indoor switch box match the setting for the
outdoor unit selected, this tells the unit its size.
Details of the disp switches in the mirror box and how you have to set them.
If you get fault 011 or fault 31 on a Monobloc with mirror box (indoor wiring box) you have not set these switches correctly
Now power it up, it will say AUoP on the outdoor unit if you heave set this up right.
Now turn to page 33.
2.0 HP 2.5 HP 3.0 HP 4.0 HP 5.0 HP 6.0 HP 8.0 HP 10.0 HP

18 19
High Temperature S80 Installation High Temperature S80 Installation
Installing the High temp indoor box
The HT box contains, the high temp refrigeration system including a
compressor, water to refrigerant heat exchanger, filter ball, flow meter, flow
switch, expansion vessel, an 8m pump, cylinder sensor and the remote
controller.
Note that the HT box makes a noise as it has a compressor in it, you need to
think about sighting this out of hearing range, don’t put it in the lounge.
It might be an idea to mount it on rubber feet and fit flexi hoses if it’s going in
the house. The fittings are 1 ¼ bsp female.
Install the unit indoors, it’s not waterproof and it sounds like a dishwasher
so keep it out of ear shot. It needs to be sited within 75m of the hot water
cylinder, and less than 75m from the outdoor unit.
The box is 600mm wide, 751mm high, 623mm deep.
Note the pump in the HT can only manage a run of 10m at 28mm diameter
copper each way to the header or cylinder.
HT units need a drain connection for the Robokit and condensation
Refrigeration pipework HT
Your fridge engineer will need to pipe between the indoor and outdoor units
with refrigeration pipework.
Pipe Sizes
Outdoor Unit & Yutaki M Indoor Unit
Model
Pipe Size
Model
Pipe Size
Gas Pipe Liquid Pipe Gas Pipe Liquid Pipe
( 3 - 6 ) HP Ø 15.88 (5/8”) Ø 9.52 (3/8”) ( 3.0 - 6.0 ) HP Ø 15.88 (5/8”) Ø 9.52 (3/8”)
Pipe Limits
Outdoor Unit (HP) 4 5 6
Maximum piping length between outdoor unit
and indoor unit (Lmax)
Actual piping length (L) 75m
Equivalent piping length 95m
Minimum piping length between outdoor unit
and indoor unit (Lmin) Actual piping length (L) 5m
Maximum height difference between indoor
and outdoor unit (H)
Outdoor unit higher than indoor unit 30m
Indoor unit higher than outdoor unit 20m
All units have enough refrigerant R410a for 15m of pipework (each way).
The additional refrigerant charge required is:
• Size 4 add 60g/m after 15m
• Size 6 add 60g/m after 15m
If the pipe length is under 5m set DSW2 pin 1 up to on. If the pipe length is over 30M set DSW2 pin 2 to up on
When delivered the indoor unit expansion valves are fully closed. To open the valve you must
apply power to the unit and make sure dip switch DSW4 pin 2 to up .
You MUST pressure test, vac and charge using both service valves at all times.
When you finish vaccing and charging switch power off the unit, set DSW4 pin 2 to off and then power up again or the unit wont
start.
+H

20 21
Pump Z1
Remote
Controller
Heating run
signal from
stat or ufh
3 port Monobloc
split and ht only
Comms to
Outdoor Unit
Power
32 Amps
Immersion Heater 13A
Cylinder sensor
up to 75m long
2 Core flex
0.75mm
Heating and Hot Water Systems HT
Wiring Diagram Heating and Hot Water HT
High Temperature S80 Installation High Temperature S80 Installation
Header,
Buffer or
Heat
Exchanger
Pump Z1
Flow and return
1 1/4” female
If unit is in the house you might want to use flexi hoses and rubber feet under the unit
Z1
Z2
Flow & Return
at Heat Pump
Return from
Header
Return from
Heating
Flow out of
Header
Flow into
Header
The 3 port valve MUST go A to DHW and B to Heating
Power the Hitachi system needs 2 power supplies Immersion heater is connected to 31 Live and 30 Neutral; Communication cable connect to the control box, terminals 1 and 2. Remote controller connect to 3 and 4. Cylinder sensor connect this using 5 and 6
Run signal, 13 is permanently 240V ac. The run signal goes into 14. Remove the link. Pump Z1 Live 14 and Neutral 34 on a combi wire live to 36 3 port connect live to 32 and Neutral to 34 the orange and grey wires are not used. If a low loss header or buffer is used you can connect a buffer sensor in 8 and 9

22 23
High Temperature S80 Installation Combi Installation
Installing the indoor box Combi
The box contains, hot water cylinder 3 port valve, water to refrigerant heat
exchanger, filter ball, flow meter, flow switch, expansion vessel, an 8m pump,
cylinder sensor and the remote controller.
Install the unit indoors, it’s not waterproof. It needs to be sited less than 30m
from the outdoor unit if size 2 and 3 and 75m if its size 4-5-6.
The box is 1816 high, 600mm wide, 733mm deep. It weighs 135kg empty and
up to 400kg full
Note the pump in the combi can only manage a run of 10m at 28mm diameter
copper each way to the header.
You need a g3 drain from the unit in 15mm, the fitting on the unit is 16mm so
needs chopping off.
Combi units need a drain connection for the Robokit and condensation
Refrigeration pipework Combi
Your fridge engineer will need to pipe between the indoor and outdoor units
with refrigeration pipework.
Pipe Sizes
Outdoor Unit & Yutaki M Indoor Unit
Model
Pipe Size
Model
Pipe Size
Gas Pipe Liquid Pipe Gas Pipe Liquid Pipe
2 HP
Ø 12.7 (1/2”) (*)
Ø 6.35 (1/4”) 2.0 HP
Ø 15.88 (5/8”) (*)
Ø 6.35 (1/4”)
2.5 HP Ø 6.35 (1/4”) (*) 2.5 HP Ø 9.52 (3/8”) (*)
( 3 - 6 ) HP Ø 15.88 (5/8”) Ø 9.52 (3/8”) ( 3.0 - 6.0 ) HP Ø 15.88 (5/8”) Ø 9.52 (3/8”)
Note on the 2 and 2.5HP units run the pipes as per outdoor unit, the indoor comes with adaptors to suit the pipework.
+H
Before power up
On the indoor circuit board set the following switches
DSW 4, Pin 5 needs to set pushed up
DSW 4 Pin 3 push to up to enable immersion heater
Note before the unit will run the expansion valve dip switch needs
to be set by the fridge engineer.
If the pipe length is under 5m set DSW2 pin 1 up to on. If the pipe
length is over 30M set DSW2 pin 2 to up on
Vaccing and Charging
When delivered the indoor unit expansion valves are fully closed.
To open the valve you must apply power to the unit and make sure
dis switch DSW4 pin 2 to up .
You MUST pressure test, vac and charge using both service valves
at all times.
When you finish vaccing and charging switch power off the unit,
set DSW4 pin 2 to off and then power up again or the unit wont
start.
Now turn to page 33.

24 25
Header,
Buffer or
Heat
Exchanger
Pump 3
Heating flow and return
2.0-3.0HP: G 1” female
4.0-6.0HP: G1 1/4” female
Cold feed and DHW out
3/4” female
Pressure
Relief 15mm
Z1
Z2
Flow & Return
at Heat Pump
Return from
Header
Return from
Heating
Flow out of
Header
Flow into
Header
Pipe Limits
Outdoor Unit (HP) 2 2.5 3 4 5 6
Maximum piping length between outdoor
unit and indoor unit (Lmax)
Actual piping length (L) 50m 75m
Equivalent piping length 70m 95m
Minimum piping length between outdoor
unit and indoor unit (Lmin) Actual piping length (L) 5m
Maximum height difference between indoor
and outdoor unit (H)
Outdoor unit higher than indoor unit 30m
Indoor unit higher than outdoor unit 20m
All units have enough refrigerant R410a for 15m of pipework (each way).
The additional refrigerant charge required is:
• Size 2 add 30g/m after 15m
• Size 3 add 40g/m after 15m
• Size 4 add 60g/m after 15m
• Size 6 add 60g/m after 15m
If the pipe length is under 5m set DSW2 pin 1 up to on. If the pipe length is over 30M set DSW2 pin 2 to up on
When delivered the indoor unit expansion valves are fully closed. To open the valve you must
apply power to the unit and make sure dip switch DSW4 pin 2 to up .
You MUST pressure test, vac and charge using both service valves at all times.
When you finish vaccing and charging switch power off the unit, set DSW4 pin 2 to off and then power up again or the unit wont
start.
Combi Installation Combi Installation
Note there is a pressure relief at the back of the unit G3, it comes out in 16mm, you need to remove this and replace the pipe with 15mm copper and don’t forget drain for indoor unit
Heating and Hot Water Systems Combi

26 27
Pump 3
Remote
Controller
Heating run
signal from
stat or ufh
Note if you want to use the heating backup heater in the Combi you need a bigger power supply. Another 13 Amps for the 2 and 3HP model and 26 Amps for the 4-5 and 6 kW
Comms to
Outdoor Unit
Power
16 Amps
2 Core flex
0.75mm
Power the Hitachi system needs 2 power supplies Communication cable connect to the control box, terminals 1 and 2. Run signal, 13 is permanently 240V ac. The run signal goes into 14. Remove the link.
Pump 3 Live 14 and Neutral 34 on a combi wire live to 36 If a low loss header or buffer is used you can connect a buffer sensor in 8 and 9
Wiring Diagram Heating and Hot Water Combi
Combi Installation Combi Installation
Before power up
On the indoor circuit board set the following switches
DSW 4, Pin 5 needs to set pushed up
DSW 4 Pin 3 push to up to enable immersion heater
Note before the unit will run the expansion valve dip switch needs
to be set by the fridge engineer.
If the pipe length is under 5m set DSW2 pin 1 up to on. If the pipe
length is over 30M set DSW2 pin 2 to up on
Vaccing and Charging
When delivered the indoor unit expansion valves are fully closed.
To open the valve you must apply power to the unit and make sure
dis switch DSW4 pin 2 to up .
You MUST pressure test, vac and charge using both service valves
at all times.
When you finish vaccing and charging switch power off the unit,
set DSW4 pin 2 to off and then power up again or the unit wont
start.
Now turn to page 33.

28 29
Split Installation Split Installation
Installing the indoor box Split
The Hydro box contains, electric backup heater, water to refrigerant heat
exchanger, filter ball, flow meter, flow switch, expansion vessel, an 8m pump,
cylinder sensor (blue) and the remote controller.
Install the unit indoors, it’s not waterproof.
It needs to be sited within 75m of the hot water cylinder, less than 75 or 30m
m from the outdoor unit.
The box is:
• 2-3hp 450mm wide, 820mm high, 275mm deep. It weighs 45kg
• 4-6hp 520mm wide, 940mm high, 360mm deep. It weighs 48kg
• 8-10hp 670mm wide, 990mm high, 360mm deep. It weighs 62kg
Note the pump in the split can only manage a run of 10m at 28mm diameter
copper each way to the header or cylinder.
Split units need a drain connection for the Robokit and condensation
Refrigeration pipework Combi
Your fridge engineer will need to pipe between the indoor and outdoor units
with refrigeration pipework.
Pipe Sizes
Outdoor Unit & Yutaki M Indoor Unit
Model
Pipe Size
Model
Pipe Size
Gas Pipe Liquid Pipe Gas Pipe Liquid Pipe
2 HP
Ø 12.7 (1/2”) (*)
Ø 6.35 (1/4”) 2.0 HP
Ø 15.88 (5/8”) (*)
Ø 6.35 (1/4”)
2.5 HP Ø 6.35 (1/4”) (*) 2.5 HP Ø 9.52 (3/8”) (*)
( 3 - 6 ) HP Ø 15.88 (5/8”) Ø 9.52 (3/8”) ( 3.0 - 6.0 ) HP Ø 15.88 (5/8”) Ø 9.52 (3/8”)
8 HP
Ø 25.4 (1” 1/18)
Ø 9.52 (3/8”) 8 HP
Ø 25.4 (1” 1/18)
Ø 9.52 (3/8”)
10 HP Ø 12.7 (1/2”) 10 HP Ø 12.7 (1/2”)
Note on the 2 and 2.5HP units run the pipes as per outdoor unit, the indoor comes with adaptors to suit the pipework.
Pipe Limits
Outdoor Unit (HP) 2 2.5 3 4 5 6 8 10
Maximum piping length between
outdoor unit and indoor unit (Lmax)
Actual piping length (L) 50m 75m 70m
Equivalent piping length 70m 95m 90m
Minimum piping length between
outdoor unit and indoor unit (Lmin) Actual piping length (L) 5m
Maximum height difference between
indoor and outdoor unit (H)
Outdoor unit higher than indoor unit 30m
Indoor unit higher than outdoor unit 20m
All units have enough refrigerant R410a for 15m of pipework (each way).
The additional refrigerant charge required is:
• Size 2 add 30g/m after 15m
• Size 3 add 40g/m after 15m
• Size 4 add 60g/m after 15m
• Size 6 add 60g/m after 15m
• Size 8 add 65g/m after 15m
• Size 10 add 65g/m after 15m
If the pipe length is under 5m set DSW2 pin 1 up to on. If the pipe length is over 30M set DSW2 pin 2 to up on
When delivered the indoor unit expansion valves are fully closed. To open the valve you must
apply power to the unit and make sure dip switch DSW4 pin 2 to up .
You MUST pressure test, vac and charge using both service valves at all times.
When you finish vaccing and charging switch power off the unit, set DSW4 pin 2 to off and then power up again or the unit wont
start.
+H

30 31
Heating and Hot Water Systems Split
Header,
Buffer or
Heat
Exchanger
Pump Z1
Flow and return
1 1/4” female
Z1
Z2
The 3 port valve MUST go A to DHW and B to Heating
Split Installation Split Installation
Power the Hitachi system needs 2 power supplies Immersion heater is connected to 31 Live and 30 Neutral; Communication cable connect to the control box, terminals 1 and 2. Remote controller connect to 3 and 4. Cylinder sensor connect this using 5 and 6
Run signal, 13 is permanently 240V ac. The run signal goes into 14. Remove the link. Pump Z1 Live 14 and Neutral 34 on a combi wire live to 36 3 port connect live to 32 and Neutral to 34 the orange and grey wires are not used. If a low loss header or buffer is used you can connect a buffer sensor in 8 and 9
Wiring Diagram Heating and Hot Water Split
Pump Z1
Remote
Controller
Heating run
signal from
stat or ufh
3 port Monobloc
split and ht only
Comms to
Outdoor Unit
Power
20 Amps
Immersion Heater 13A
Cylinder sensor
up to 75m long
2 Core flex
0.75mm
Note if you want to use the heating backup heater in the Split you need a bigger power supply. Another 13 Amps for the 2 and 3HP model and 26 Amps for the 4-5 and 6 kW

32 33
Before power up
On the indoor circuit board set the following switches
DSW 4, Pin 5 needs to set pushed up
DSW 4 Pin 3 push to up to enable immersion heater
Note before the unit will run the expansion valve dip switch needs
to be set by the fridge engineer.
If the pipe length is under 5m set DSW2 pin 1 up to on. If the pipe
length is over 30M set DSW2 pin 2 to up on
First make sure the dip switches are set, see the settings for your
unit.
Before filling the unit with water remove cap from auto vent in
unit, on the combi its top left inside the indoor unit.
Please make sure all fittings are tight before filling the unit with
water
Filling and flushing, when installing any Heat pump, we insist on a
thorough system flush prior to connection in line with the Building
Regulations for England and Wales, Part L, 2006. Using the power
flusher fill the system with water, there is a pressure sensor in the
unit so we can operate from 1.5 -3 bar maximum.
In Monobloc units only Using the power fill the system with water

Setting up the cylinder immersion heater
To avoid the immersion heater cutting out before the legionella
function is complete you have to set the stat in the immersion
heater to 65°C minimum, on a Telford cylinder set it to 5.
Powering Up
Makes sure all your room thermostats are off and all underfloor
run signals are off.
Apply power to outdoor unit first. Now power the indoor unit, you
should see a display on the indoor and outdoor pcb.
Vaccing and Charging
All split units are delivered with a refrigerant charge in the outdoor
unit and all expansion valves in the indoor unit in the fully open
position.
If you power the unit up the expansion valves DO NOT close.
You can vac the system powered or unpowered.
Once you have released the refrigerant into the system and added
any additional charge you need to be set the unit back to normal
operation.
Power off the units (indoor and outdoor for 5 mins.
Flick DSW4 pin 2 to down (Off).
If you don’t do this the unit will never run.
Now turn to page 33.
Split Installation Start-up procedure

34 35
Remote controller set up first time Remote controller set up first time
When you first power up the unit the remote controller will ask you a few
questions please follow as directed below:
1. Select language, English, press OK
2. Date and Time, use left and right to select 12 or 24-hour format, press
down,
3. Year will highlight, use up and down to change, press right, set month
using up and down,
4. Press right, set day using up and down,
5. Press right, set hours and minutes. Then press ok.
6. Configuration assistant, press ok
7. Is this device attached to unit? Select yes using right, press ok
8. Is this device used as a room thermostat? Select no, press ok
9. How many circuits do you have? Select 1, press ok
10. What are the heat emitters on the circuit? Select to suit (Radiators or
UFH), press ok
11. If you have rads AND UFH select rads.
12. Do you have a domestic hot water tank installed? If you have a
cylinder select yes, press ok.
13. Do you have a swimming pool? No, press ok.
14. Do you have a boiler installed? No, press ok. (If you have a hybrid
system or Backup boiler, select yes, it will then ask what the bi-valent
point is, set to 3 degrees or you’re your design temp)
15. Do you have electric backup heater? Select no on Monobloc and HT
units, select yes in Split and Combi units, press ok.
16. How many thermostats are installed? Select 0 (This is asking how
many HITACHI thermostats are installed on the system, so we select 0,
even though your system will be controlled by an external run signal),
press ok.
17. Completed shows, press ok.
On all units Activate Anti Legionella
1. Scroll up to DHW – OK
2. Scroll down to Anti Legionella – OK
3. Status press right to change to enabled
4. Press down, to operation day, press left to Tuesday
5. Down to start time to right to 3 am
6. Press down setting temperature 60°C
7. Press return x 2
On all units Stop Pumps running when there is no demand.
1. DSW 4, Pin 5 needs to set- pushed up (already done)
2. Scroll to Heat Pump – OK
3. Water Pump Configuration – OK
4. Minimum off time – Change to 0 mins
5. Minimum on time – change to 0 mins
6. Overrun time – change to 0 mins
7. Press return x2
On all units Adjust the weather comp
8. In system configuration, ok
9. Space heating, ok
10. Circuit 1, ok
11. Water calculation mode, ok
12. OTC gradient shows go left to points.
13. In points graph, pressing down highlights the water temp at low
ambient, set this using left or right arrows to 45°C for UFH or 50°C for
radiators. On HT units set this to 70°C
14. Pressing down highlights water temp at low ambient temperatures,
set this using right or left to 37°C. On HT units set this to 50°C
15. Press down to set the low ambient temp set this to -2 with the right
button,
16. Press down to set the high ambient temperature, use the left arrow
button to set this to 15°C.
17. Press return 3 times until you get back to the menu.
IMPORTANT do this: Air Purge Procedure
18. Scroll down to Commissioning – OK
19. Air Purge Procedure – OK
20. Set duration – 30 mins use left or right, Down Select start air purge –
OK
21. Do you want to continue Select Yes – OK
22. Let the unit cycle the pumps and get the air out the system, it will
take it up to 30 mins. Press down Select Cancel – OK to stop Air Purge
procedure.
23. Once finished press return 3 times to menu screen, scroll down to
return to user mode, press ok. Do you want to continue right ok.
Accessing the Installer Menu
To get into the installer menu to start the commissioning process, hold the Back/Return and the OK button together for three seconds.
It was ask for a passcode, the passcode is: Right, Down, Left, Right. “Passcode Correct” shows, press ok. You will now see a picture of a
Spanner in the bottom, right hand corner. Press the Menu button and you will see more options in the menu than when in user mode.
On a Combi unit, only If you are using a buffer, plate heat exchanger or a
low loss header with pump 3.
1. Press Menu
2. System Configuration – OK
3. Optional Functions – OK
4. System – OK
5. Hydraulic Separator Status – press right change to enabled
6. Press return x 2
This setting activates the pump on the heating side of the header.

36 37
Cylinder Timer, if you are heating a hot water cylinder
From the home screen
1. Push right arrow to select DHW – OK
2. Select Timer – OK
3. If Simple Timer is Selected:
4. Frequency – Never / Once / Everyday / Weekends / Work day (Monday
– Friday) change to suit
5. Starting Time – change to suit
6. Setting Temperature – Change to suit.
7. Stop Time – change to suit
Starting the unit in heating mode
With everything off the display on the PCB shows oF
On the controller Scroll to highlight heating C1, press power button to turn
heating on.
You will see the target temp displayed and off written underneath. The indoor
PCB shows hESt its in heating standby waiting for a run signal.
Now turn up your heating thermostats the unit will operate. The display will
show hE0f. Note on the remote controller the pumps 1 (in the unit) and 3 after
the header are running and the off signal goes, When the compressor starts
the display will show hEon
If alarm A.70 shows
If the flow rate is too low, you need to fix this before moving on. Remove
any air, clean the filter in the unit and if it’s still not enough you need bigger
pumps. To clear the fault code, switch off both heating and hot water then
switch them on again.
To test flow rates and temperatures
1. Hold back / return and OK together for 3 seconds.
2. Enter Password shows, Enter Password as right down, left right,
3. Password is correct press OK
4. Press Menu, Scroll to Heat Pump – OK, Water Pump Configuration –
OK,
5. Overrun time – change to 5 mins, Press return x2
6. Go to Operational information, OK, select Heat pump details, OK flow
rates is listed.
Flow must be 7l/min or 0.4m/hr on size 2 and 3 units. 14l/min 0.8m/hr on
size 4,5 and 6 units and 25l/min or 1.5m/hr on size 8 and 10 units. A.70 also
shows on the PCB
Starting the System in hot water mode
On the controller scroll left highlight Heating C1, press power to turn this off.
With everything off the indoor PCB will say oF.
Scroll right highlight DHW, press power to turn DHW on. Press up to set the
temperature of the cylinder typically 55°C for a low temp and 70°C for a high
temp unit.
The PCB will show hSoF, it will change to hSon when it opens the 3 port to the
cylinder and starts pump 1
When its running check the flow rate again.
1. Press Menu
2. Operational Information – Ok
3. Scroll down to Heat Pump Details – OK
4. Water Flow Level – will show current water flow rate (m/hr)
Run test in hot water mode
Once the unit has got going you can view the temperatures and record them
on the warranty card at the front of the book.
To test cylinder and flow temp:
1. Press menu,
2. Operational information ok,
3. Select DHW ok
4. All temperatures are listed.
On LT units the water storage temperature is lower (50°C) than a normal
cylinder. It’s important to check that any shower or bath mixers do not further
reduce the water temperature. Using your thermometer check that the hot
water comes out the tap at the same temperature it leaves the cylinder. If it
doesn’t you might need to make adjustments to taps mixers etc. DON’T raise
the cylinder temperature to compensate.
Remote controller set up first time Remote controller set up first time
Now handover the system to the end user and fill in the warranty card at the front of the book. Your system is now fully
commissioned, congratulations.

38 39
What the Unit Comes With and What You Will NeedWhat the Unit Comes With and What You Will Need
Diverter valves
Hitachi use a 3-port valve to convert from heating to hot water
Heat meters
If you are using more than one heat source, heat pump + boiler you MUST measure the heat
produced by the heat pump and the electricity used. This is essential for RHI. The heat meter
goes in the return to the heat pump with a sensor in the flow. The electricity meter must
measure only the power consumed by heat pump. See hybrid drawings.
The Cylinder
If you want to heat water with a heat pump you need a dedicated heat pump cylinder. These
are 600mm diameter and are pre-insulated and can store water at up to 3 bar pressures.
Note the size and weight of the cylinder. Full installation instructions will be included with
the cylinder.
Ideally Cylinders should only be used IF the coil area is more than 2.5m. Smaller coils give
very long recovery times and increase usage of the immersion heater. Cylinders can be
pressurised or open vented. We can work out the run cost for you if you tell us the coil size.
Below is a list of the components you will need to buy for each of the systems:
Flexible hoses
we recommend flexi hoses are used on Monobloc systems, they are not required on the split
systems. The water connections to all units are 1 inch BSP female up to size 4 and 1 1/4 on
the 5 and 6 units. We recommend connecting the water pipework with flexible hoses for ease
of maintenance and to avoid any vibration from the unit going into the house. All external
pipework has to be insulated to meet MCS standards.
Mounting feet
the outdoor units need to be mounted 100mm above the ground, we recommend using
rubber feet with unistrut channel. These come with mounting bolts included. Splits have 2
feet, monos have 3 feet
An expansion vessel, pressure gauge, pressure relief valve and filling loop
All Hitachi units have an expansion vessel inside.
Pump
The Hitachi units have a 7.5m pump installed inside.
Assuming you use a low loss header for heating, 1x 3 port zone valves and 6 elbows, you can
run, measuring from the header to the heat pump
• 30 m separation on 22mm copper for the 2HP
• 30 m separation on 28mm copper for the 3HP
• 20 m separation on 28mm copper for the 4-6HP
• Call for the 8 and 10HP
If your runs exceed this give us a call as you might need extra pumps.
Water Filter
The Hitachi units have a filter inside the units, if the unit is running on a dirty system an
additional filter might be a good idea.
Glycol / anti-freeze
In Monobloc heat pumps the water goes outside the building. The unit can protect itself
from freezing up, but if the power goes off there is a risk that the unit will freeze causing
damage. To prevent this, we recommend putting propylene glycol mixture in the system. It
is important that the glycol concentration is adequate to protect the unit, if the unit freezes

conditions.
Adding too much glycol is not a good idea as it increases the water pump power and slightly
reduces the capacity of your system.
Flow switch and flow meter
The Hitachi units have a flow meter and switch installed in the units.