Mitsubishi Electric EHST20 Series User manual

CYLINDER UNIT
EHST20 series
EHPT20 series
HYDROBOX
EHSC series
EHPX series
BEDIENUNGSANLEITUNG
Lesen Sie sich zur sicheren und korrekten Verwendung diese Bedienungsanleitung bitte sorgfältig durch, be-
vor Sie den Speicher und die Hydraulikeinheit.
FÜR NUTZER
OPERATION MANUAL
For safe and correct use, please read this operation manual thoroughly before operating the cylinder unit and
the hydrobox.
MODE D'EMPLOI
Pour garantir une utilisation sûre et appropriée, lisez attentivement le présent mode d'emploi avant d'utiliser le
module hydraulique combiné et le module hydraulique.
HANDLEIDING
Voor een veilig en juist gebruik moet u deze handleiding goed doorlezen alvorens de cilinder-unit en hydrobox
in gebruik te nemen.
MANUAL DE INSTRUCCIONES
Para un uso correcto y seguro de la unidad cilindro y del Hydrobox, lea este manual de instrucciones antes de
su utilización.
MANUALE DI FUNZIONAMENTO
Per un uso corretto e sicuro del dispositivo, leggere attentamente il presente manuale di funzionamento prima
di utilizzare dell'unità con bollitore e dell'hydrobox.
MANUAL DE FUNCIONAMENTO
Para uma utilização segura e correcta, é favor ler cuidadosamente este manual de funcionamento antes de
trabalhar com o no cilindro e nos hídricos.
BRUGSVEJLEDNING
Læs venligst denne brugsvejledning grundigt inden betjening af den i cylinderenheden og hydroboksen.
ANVÄNDARMANUAL
För säker och korrekt användning, var god läs denna användarmanual noggrant innan du använder i tanken
och hydroboxen.
English
Deutsch
Français
Nederlands
Español
Italiano
Português
Dansk
Svenska
BRUKSANVISNING
Les denne bruksanvisningen nøye før du bruker i sylinderenheten og vanntanken i bruk, for å sikre trygg og
riktig bruk. Norsk
KÄYTTÖOPAS
Turvallisen ja asianmukaisen käytön varmistamiseksi lue tämä käyttöopas huolellisesti ennen varaajayksikkö
ja hydrobox käyttöä. Suomi
KÄYTTÄJÄLLE
FOR BRUKEREN
FOR USER
POUR LES UTILISATEURS
VOOR DE GEBRUIKER
PARA EL USUARIO
PER L’UTENTE
PARA O UTILIZADOR
TIL BRUGER
FÖR ANVÄNDAREN

1
Contents
1. Safety Precautions...........................................2
Disposal of the Unit......................................................... 2
2. Introduction.......................................................3
Overview of the System.................................................. 3
How the Heat Pump Works............................................. 3
Economical Best Practice............................................... 4
Overview of Controls ...................................................... 4
3. Your Heating System........................................5
System Conguration ..................................................... 5
Important Parts of the Units - Points to Note.................. 5
Product Specication ...................................................... 6
4. Customising Settings for Your Home.............7
Main Controller ............................................................... 7
General Operation .......................................................... 8
Changing Initial Settings................................................. 8
Schedule......................................................................... 9
Holiday Mode................................................................ 10
Heating Mode ............................................................... 10
Domestic Hot Water (DHW) / Legionella Prevention.....11
Service Menu................................................................ 12
5. Service and Maintenance...............................13
Troubleshooting ............................................................ 13
Maintenance ................................................................. 13
Abbreviations and glossary
Abbreviations/Word Description
Ambient temperature The outdoor temperature
Freeze stat. function Heating to prevent water pipes freezing
ASHP/HP Air source heat pump
COP Coefcient of performance the efciency of the heat pump
Cylinder unit Indoor unvented DHW tank and component plumbing parts
Hydrobox Indoor unit housing the component plumbing parts and a plate heat exchanger
DeltaT Difference in temperature between two variables
DHW mode Domestic hot water heating mode for showers, sinks, etc
Flow rate Speed at which water circulates around the primary circuit
Flow temperature Temperature at which water is delivered to the primary circuit
FTC3 Flow temperature controller, the circuit board in charge of controlling the system
Compensation curve mode Space heating incorporating outdoor temperature compensation
Heating mode Space heating through radiators or UFH
Legionella Bacteria potentially found in plumbing, showers and water tanks that may cause Legionnaires disease
LP mode Legionella prevention mode – a function on systems with tanks to prevent the growth of legionella bacterium
Packaged model Plate heat exchanger in the outdoor heat pump unit
Refrigerant A compound used within the heat cycle that goes through a phase change from gas to liquid
Split model Plate heat exchanger in the indoor unit
TRV Thermostatic radiator valve – a valve on the entrance or exit of the radiator panel controlling the heat output
UFH Under oor heating – a system of water carrying pipes under the oor, that warms the oor surface

2
Safety Precautions
1
Disposal of the Unit
This symbol mark is for EU countries only.
This symbol mark is according to the directive 2002/96/EC
Article 10 Information for users and Annex IV, and/or to the
directive 2006/66/EC Article 20 Information for end-users and
Annex II.
Your Mitsubishi Electric heating system products have been man-
ufactured with high quality materials and components which can
be recycled and/or reused. The symbol in Figure 1.1 means that
electrical and electronic equipment, batteries and accumulators
at the end of their life, should be disposed of separately from your
household waste.
If a chemical symbol is printed beneath the symbol (Figure 1.1),
this chemical symbol means that the battery or accumulator con-
tains a heavy metal at a certain concentration. This is indicated as
follows;
Hg: mercury (0.0005%), Cd: (cadmium (0.002%), Pb: lead (0.004%)
In the European Union there are separate collection systems for used electrical
and electronic products, batteries and accumulators.
Please dispose of this equipment, batteries and accumulators correctly at your lo-
cal community waste collection/recycling centre.
Contact your local Mitsubishi Electric dealer for country-specic details on
disposal.
Please, help us to conserve the environment we live in.
WARNING
The unit should NOT be installed or serviced by the user. If installed incorrectly water leakage, electric shock and re may result.
NEVER block discharges from emergency valves.
Do not operate the unit without emergency valves and thermostatic cut outs being operational. If in doubt contact your installer.
Do not stand on or lean on unit.
Do not place objects on top or below the unit and observe service space requirements when placing objects next to the unit.
Do not touch the unit or controller with wet hands as electric shock may result.
Do not remove the panels of the unit or try to force objects inside the unit’s casing.
Do not touch protruding pipework as it may be very hot and cause burns to the body.
Should the unit start vibrating or making abnormal noises stop operation, isolate from the power supply and contact the installer.
Should the unit start to produce any burning smells stop operation, isolate from the power supply and contact the installer.
Should water be visibly being discharged through the tundish stop operation, isolate from the power supply and contact the installer.
The Mitsubishi Electric cylinder and hydroboxes are NOT intended for use by children or inrm persons without supervision.
Care should be taken to prevent children and pets having easy access to the units.
In the case of a refrigeration leak, stop the operation of the unit, thoroughly ventilate the room and contact the installer.
If power supply cable is damaged, it must be replaced by the manufacturer, its service agent or similarly qualied persons in order to avoid a hazard.
Do not place containers with liquids in on top of the unit. If they leak or spill the unit may be damaged and re could occur.
When installing or relocating, or servicing the cylinder unit and the hydrobox, use only the specied refrigerant (R410A) to charge the refrigerant lines.
Do not mix it with any other refrigerant and do not allow air to remain in the lines. If air is mixed with the refrigerant, then it can be the cause of abnormal
high pressure in the refrigerant line, and may result in an explosion and other hazards.
The use of any refrigerant other than that specied for the system will cause mechanical failure or system malfunction or unit breakdown. In the worst
case, this could lead to a serious impediment to securing product safety.
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CAUTION
Do not use sharp objects to press the buttons of the main controller as this will cause damage to the buttons.
If power to unit is to be turned off for a long time, the water should be drained.
Do not place a container etc. lled with water on the top panel.
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► Before operating this unit it is important to read the safety precautions.
► The following safety points are provided to prevent injury to yourself and damage to the unit please adhere to them.
Used in this manual
WARNING:
Precautions listed under this title should be observed to prevent
injury or death to the user.
CAUTION:
Precautions listed under this title should be observed to prevent
damage to the unit.
<Figure 1.1>
Follow the instructions provided in this manual and local regulations when using this unit.•

3. Expansion valve
2. Condenser
1. Compressor
4. Evaporator
(Plate heat exchanger)
(Outdoor unit air heat exchanger)
2 kW
Low temperature renewable heat
energy taken from the environment
3 kW
1 kW
Useful energy outputElectrical power input
3
Introduction
2
The purpose of this user manual is to inform users how their air source heat
pump heating system works, how to run the system at its most efcient and how
to change settings on the main controller.
This appliance is not intended for use by persons (including children) with
reduced physical, sensory or mental capabilities, or lack of experience and
knowledge, unless they have been given supervision or instruction con-
cerning the use of the appliance by a person responsible for their safety.
Children should be supervised to ensure they do not play with the appli-
ance.
This user manual should be kept with the unit or in an accessible place for
future reference.
Overview of the System
The Mitsubishi Electric Air to Water (ATW) heat pump system consists of the fol-
lowing components; outdoor heat pump unit and indoor cylinder unit or hydrobox
incorporating main controller.
How the Heat Pump Works
Space heating and DHW
Heat pumps take electric energy and low grade heat energy from the outdoor air
to heat refrigerant which in turn heats water for domestic use and space heating.
The efciency of a heat pump is known as the Coefcient of Performance or COP
this is the ratio of heat delivered to power consumed.
The operation of a heat pump is similar to a refrigerator in reverse. This process
is known as the vapour-compression cycle and the following is a more detailed
explanation.
The rst phase begins with the refrigerant being cold and low pressure.
1. The refrigerant within the circuit is compressed as it passes through the com-
pressor. It becomes a hot highly pressurised gas. The temperature also rises
typically to 60°C.
2. The hot refrigerant gas is then condensed as it passes across one side of a
plate heat exchanger. Heat from the refrigerant gas is transferred to the cooler
side (water side) of the heat exchanger. As the temperature of the refrigerant
decreases its state changes from a gas to a liquid.
3. Now as a cold liquid it still has a high pressure. To reduce the pressure the liq-
uid passes through an expansion valve. The pressure drops but the refrigerant
remains a cold liquid.
4. The nal stage of the cycle is when the refrigerant passes into the evaporator
and evaporates. It is at this point when some of the free heat energy in the out-
side air is absorbed by the refrigerant.
It is only the refrigerant that passes through this cycle; the water is heated as it
travels through the plate heat exchanger. The heat energy from the refrigerant
passes through the plate heat exchanger to the cooler water which increases in
temperature. This heated water enters the primary circuit and is circulated and
used to serve the space heating system and indirectly heat the contents of the
DHW cylinder (if present).
Schematic of package cylinder system

4
Introduction
2
Economical Best Practice
Air source heat pumps can provide both hot water (providing a suitable cylinder is
used) and space heating all year. The system is different to a conventional fossil
fuel heating and hot water system. The efciency of a heat pump is shown by its
coefcient of performance as explained in the introduction. The following points
should be noted to achieve the most efcient and economical operation of your
heating system.
Important points about heat pump systems
Domestic hot water and legionella functions are only available on cylinder units
or hydroboxes plumbed to an appropriate storage cylinder.
In normal operation simultaneous DHW and space heating is unadvisable.
However during periods of extremely low ambient temperature, the immersion
heater (if present) can be used for DHW whilst the heat pump continues to pro-
vide space heating. Please be aware that the immersion heater, used alone, is
not an efcient method to heat the whole DHW tank. Therefore it should only
be used as a back up in normal operation.
The hot water produced by the heat pump is typically at a lower temperature
than a fossil fuel boiler.
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Implications
If the heat pump is being used for DHW the time at which tank heat up oc-
curs should be scheduled using the SCHEDULE function (see page 10).
Ideally this should be during the night time when little space heating is re-
quired and economy electricity tariffs can be taken advantage of.
In most situations space heating is best performed using the room tempera-
ture mode. This enables the heat pump to analyse current room tempera-
ture and react to changes in a controlled manner utilising the specialised
Mitsubishi Electric controls.
Using the SCHEDULE and HOLIDAY functions prevent unnecessary Space
or DHW heating when the property is known to be unoccupied for instance
during the working day.
Due to lower ow temperatures, heat pump heating systems should be used
with large surface area radiators or under-oor heating. This will provide a
steady heat to the room whilst improving efciency and so lowering running
costs of the system as the heat pump does not have to produce water at
very high ow temperatures.
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Overview of Controls
Built into the cylinder unit and hydrobox is the Flow Temperature Controller3
(FTC3). This device controls the function of both the outdoor heat pump unit and
the indoor cylinder or hydrobox. The advanced technology means that by us-
ing an FTC3 controlled heat pump you can not only make savings compared to
traditional fossil fuel type heating systems but also compared to many other heat
pumps on the market.
As explained in the earlier section, ‘How the Heat Pump Works,’ heat pumps are
most efcient when providing low ow temperature water. The FTC3 advanced
technology enables the room temperature to be kept at the desired level whilst
utilising the lowest possible ow temperature from the heat pump.
In room temp (Auto adaptation) mode the controller uses temperature sensors
around the heating system to monitor space and ow temperatures. This data
is regularly updated and compared to previous data by the controller to predict
changes in room temperature and adjust the temperature of water owing to the
space heating circuit accordingly. By monitoring not only the outdoor ambient, but
the room and heating circuit water temperatures, the heating is more consistent
and sudden spikes in required heat output are reduced. This results in a lower
overall ow temperature being required.