Hitachi YUTAKI S Series User manual

–
INSTALLATION
AND OPERATION
MANUAL
–
YUTAKI S SERIES
INDOOR UNITS
PMEN0643 rev.0 - 04/2023
MODELS
SPLIT SYSTEM
RWM-(1.5-3.0)R2E

EN
The English version is the original one; other languages are translated from English. Should any
discrepancy occur between the English and the translated versions, the English version shall
prevail.
ES
La versión en inglés es la original, y las versiones en otros idiomas son traducciones de la inglesa.
En caso de discrepancias entre la versión inglesa y las versiones traducidas, prevalecerá la versión
inglesa.
DE
Die englische Fassung ist das Original, und die Fassungen in anderen Sprachen werden aus dem
Englischenübersetzt. Sollten die englische und die übersetzten Fassungen voneinander abweichen,
so hat die englische Fassung Vorrang.
FR
La version anglaise est la version originale; les autres langues sont traduites de l’anglais. En cas de
divergence entre les versions anglaise et traduite, la version anglaise prévaudra.
IT
La versione inglese è l’originale e le versioni in altre lingue sono traduzioni dall’inglese. In caso di
divergenze tra la versione inglese e quelle tradoe, fa fede la versione inglese.
PT
A versão inglesa é a original; as versões em outras línguas são traduzidas do inglês. Em caso de
divergência entre a versão em língua inglesa e as versões traduzidas, faz fé a versão em língua
inglesa.
DA
Den engelske udgave er originalen, og udgaverne på andre sprog er oversat fra engelsk. Hvis der
forekommer uoverensstemmelser mellem den engelske og den oversae sprogudgave, vil den
engelske udgave være gældende.
NL
De Engelse versie is de originele; andere talen zijn vertaald uit het Engels. In geval van verschillen
tussen de Engelse versie en de vertaalde versies, hee de Engelse versie voorrang.
SV
Den engelska versionen är originalet, och versionerna på andra språk är från engelska
översäningar. I händelse av bristande överensstämmelse mellan den engelska och den översaa
versionerna, skall den engelska versionen vara gilg.
EL
Η αγγλική έκδοση είναι το πρωτότυπο και οι εκδόσεις σε άλλες γλώσσες μεταφράζονται από τα
αγγλικά. Σε περίπτωση που διαπιστωθούν διαφορές μεταξύ της αγγλικής και της μεταφρασμένης
έκδοσης, η αγγλική έκδοση είναι επικρατέστερη.
BG
Версията на английски език е оригиналната; версиите на останалите езици са в превод от
английски език. При различие между английската версия и преводна версия на друг език за
меродавна се счита английската версия.

CS
Originální verze tohoto dokumentu je v angličně; ostatní jazykové varianty jsou z angličny přeložené.
Pokud mezi anglickou a jakoukoli jinou jazykovou verzí dojde k rozporu, bude převažovat anglická verze.
HU
Az erede változat az angol; az egyéb nyelvű változatok angolról leek fordítva. Amennyiben az angol
és a fordíto verziók közö bármilyen eltérés mutatkozik, az angol nyelvű változat a mérvadó.
LT
Versija anglų kalba yra originali; versijos kitomis kalbomis yra išverstos iš anglų kalbos. Jei yra
neakimų tarp versijos anglų kalba ir versnių versijų, pirmenybė teikiama versijai anglų kalba.
PL
Wersja angielska jest wersją oryginalną - wszystkie pozostałe stanowią jej tłumaczenie na odpowiednie
języki. W przypadku stwierdzenia jakichkolwiek rozbieżności między oryginałem a jego tłumaczeniem,
rozstrzygająca jest wersja w języku angielskim.
RO
Versiunea originală este cea în limba engleză; versiunile în alte limbi sunt traduse din limba engleză.
Dacă există vreo discrepanță între versiunile în limba engleză și versiunea tradusă, prevalează versiunea
în limba engleză.
SK
Anglická verzia je pôvodná, ďalšie jazyky sú preložené z angličny. V prípade akýchkoľvek nezrovnalos
medzi anglickou a preloženou verziou, bude rozhodujúca anglická verzia.
UK
Англійська версія є оригінальною; інші мови переведені з англійської. У разі виникнення
розбіжностей між англійською та перекладеною версіями, англійська версія має переважну силу.
EN English Original version
ES
Español
Versión traducida
DE
Deutsch
Übersetzte Version
FR
Français
Version traduite
IT
Italiano
Versione tradoa
PT
Português
Versão traduzidal
DA
Dansk
Oversat version
NL
Nederlands
Vertaalde versie
SV
Svenska
Översa version
EL
Ελληνικα
Μεταφρασμένη έκδοση
BG
Български
Преведена версия
CS
Češna
Přeložená verze
HU
Magyar
Lefordíto változat
LT
Lietuvių
Versta versija
PL
Polski
Tłumaczenie wersji oryginalnej
RO
Română
Versiune tradusă
SK
Slovenčina
Preložená verzia
UK
Українська
Перекладена версія

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PMEN0643 rev.0 - 04/2023
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CONTENTS
Contents
01 General informaon .............................................................................................1
02 Name of parts and dimensional data...................................................................7
03 Electrical data .......................................................................................................9
04 Working range ....................................................................................................12
05 Refrigerant and water piping .............................................................................16
06 Electrical and control sengs ............................................................................30
07 Maintenance.......................................................................................................51
08 Commissioning ...................................................................................................57
09 ERP Data .............................................................................................................63

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GENERAL INDEX
General Index
1. General informaon ...................................................................................................1
1.1 General informaon ..........................................................................................2
1.1.1 General notes ..........................................................................................2
1.2 Applied symbols.................................................................................................3
1.3 Addional informaon about safety .................................................................4
1.4 Important noce................................................................................................5
1.5 Product guide ....................................................................................................6
1.5.1 Classicaon of the units ........................................................................6
1.5.1.1 Split system - Indoor unit - YUTAKI S ...........................................6
1.5.2 Product list...............................................................................................6
1.5.2.1 Split system - Indoor unit - YUTAKI S ...........................................6
2. Name of parts and dimensional data ........................................................................7
2.1 YUTAKI S - RWM-(1.5-3.0)R2E............................................................................8
3. Electrical data.............................................................................................................9
3.1 Consideraons.................................................................................................10
3.2 Split system - Indoor unit - YUTAKI S ................................................................11
4. Working range ..........................................................................................................12
4.1 Power supply working range ...........................................................................13
4.2 R32 Temperature working range.....................................................................13
4.2.1 Space heang ........................................................................................13
4.2.2 DHW.......................................................................................................14
4.2.3 Swimming pool heang.........................................................................14
4.2.4 Space cooling (Necessary cooling kit) ...................................................14

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GENERAL INDEX
4.3 R32 Hydraulic working range ..........................................................................15
4.3.1 Hydraulic data........................................................................................15
4.3.2 Pump performance curves....................................................................15
5. Refrigerant and water piping....................................................................................16
5.1 General notes before performing piping work ...............................................17
5.2 R32 Refrigerant circuit.....................................................................................17
5.2.1 General notes R32 refrigerant...............................................................17
5.2.2 Refrigerant piping ..................................................................................18
5.2.3 Refrigerant charge .................................................................................20
5.2.3.1 Refrigerant charge amount......................................................20
5.2.3.2 Refrigerant charge before shipment (W0 (kg)).........................20
5.3 Water piping ....................................................................................................20
5.3.1 Water piping length...............................................................................20
5.3.2 Water piping size ...................................................................................20
5.3.3 Water quality for primary (space heang / cooling) and secondary
(DHW) circuit..........................................................................................21
5.3.3.1 Water lling ..............................................................................22
5.3.4 Requirements and recommendaons for the hydraulic circuit............25
5.3.5 Water ow control.................................................................................26
5.4 Space heang and DHW..................................................................................26
5.4.5.1 Addional hydraulic necessary elements for space heang ...26
5.4.5.2 Addional hydraulic oponal elements (For DHW).................29
6. Electrical and control sengs ..................................................................................30
6.1 General check ..................................................................................................31
6.2 Electrical connecon .......................................................................................32
6.2.1 Wiring size .............................................................................................32

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GENERAL INDEX
6.2.2 Minimum requirements of the protecon devices ..............................33
6.3 Seng of DIP switches and RSW switches......................................................34
6.3.1 Locaon of DIP switches and rotary switches.......................................34
6.3.1.1 Funcon of DIP switches and rotary switches .........................34
6.3.1.2 LED indicaon...........................................................................38
6.4 Terminal board connecons............................................................................39
6.4.1 Table board 1 .........................................................................................39
6.4.2 Table board 2 .........................................................................................40
6.4.2.1 Indoor/outdoor communicaon wiring (TB2) / ATW-RTU
Communicaon / Central Devices Communicaon .......... ......40
6.4.2.2 Summary of terminal board connecons................................41
6.4.2.3 Input terminals (Default input funcons)................................43
7. Maintenance.............................................................................................................51
7.1 Removing the covers .......................................................................................52
7.1.0.1 Removing the indoor unit service cover..................................52
7.1.0.2 Removing indoor unit electrical box ........................................53
7.1.0.3 Space heang pipes connecon ..............................................54
7.1.0.4 Drain pipes connecon ............................................................54
7.1.0.5 Cover assembly ........................................................................55
7.1.1 Test and check .......................................................................................56
8. Commissioning .........................................................................................................57
8.1 Before operaon..............................................................................................58
8.2 Preliminary check ............................................................................................58
8.2.1 Checking the unit...................................................................................58
8.2.2 Electrical checking .................................................................................58
8.2.3 Hydraulic circuit checking (space heang and DHW) ...........................59

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GENERAL INDEX
8.2.4 Checking the refrigerant circuit.............................................................60
8.3 Commissioning procedure ..............................................................................60
8.4 Test run / air purge ..........................................................................................61
9. ERP Data....................................................................................................................63
9.1 AVERAGE climate.............................................................................................64
9.2 WARMER climate.............................................................................................65
9.3 COLDER climate ...............................................................................................65
9.4 Addional data ...............................................................................................66
9.5 General ERP data for hot water storage tanks................................................66

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GENERAL INFORMATION
General informaon
1.1 Generalinformaon ..........................................................................................2
1.1.1 Generalnotes ..........................................................................................2
1.2 Appliedsymbols.................................................................................................3
1.3 Addionalinformaonaboutsafety .................................................................4
1.4 Importantnoce................................................................................................5
1.5 Productguide ....................................................................................................6
1.5.1 Classicaonoftheunits ........................................................................6
1.5.1.1 Splitsystem-Indoorunit-YUTAKIS ...........................................6
1.5.2 Productlist...............................................................................................6
1.5.2.1 Splitsystem-Indoorunit-YUTAKIS ...........................................6

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GENERAL INFORMATION
GENERAL INFORMATION
1.1 General informaon
1.1.1 General notes
© Copyright 2023 Johnson Controls-Hitachi Air Condioning Spain, S.A.U. – All rights reserved.
No part of this publicaon may be reproduced, copied, led or transmied in any shape or form
without the permission of Johnson Controls-Hitachi Air Condioning Spain, S.A.U.
Within the policy of connuous improvement of its products, Johnson Controls-Hitachi Air
Condioning Spain, S.A.U. reserves the right to make changes at any me without prior nocaon
and without being compelled to introducing them into previously sold products. This document
may therefore have been subject to amendments during the life of the product.
Hitachi makes every eort to oer correct, up-to-date documentaon. Despite this, prinng errors
cannot be controlled by Hitachi and are not its responsibility.
As a result, some of the images or data used to illustrate this document may not refer to specic
models. No claims will be accepted based on the data, illustraons and descripons included in
this manual.
No type of modicaon must be made to the equipment without prior, wrien authorizaon from
the manufacturer.

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APPLIEDSYMBOLS
GENERAL INFORMATION
1.2 Applied symbols
During normal heat pump system design work or unit installaon, greater aenon must be paid in
certain situaons requiring parcular care in order to avoid damage the unit, the installaon or the
building or property.
Situaons endangering the safety of those in the surrounding area or to the unit itself are clearly
indicated in this manual.
Special symbols are used to clearly idenfy these situaons.
Pay close aenon to these symbols and to the messages following them, as your safety and that
of others depends on it.
!DANGER
• The text following this symbol contains informaon and instrucons relang directly to your
safety in addion to hazards or unsafe pracces which could result in severe personal injuries
or death.
• Not taking these instrucons into account could lead to serious, very serious or even fatal
injuries to you and others in the proximies of the unit.
In the texts following the danger symbol you can also nd informaon on safety procedures during
unit installaon.
!CAUTION
• The text following this symbol contains informaon and instrucons relang directly to your
safety, in addion to hazards or unsafe pracces which could result in minor personal injuries or
product or property damage.
• Not taking these instrucons into account could lead to minor injuries to you and others.
• Not taking these instrucons into account could lead to unit damage.
In the texts following the cauon symbol you can also nd informaon on safety procedures during
unit installaon.
NOTE
• The text following this symbol contains informaon or instrucons that may be of use or that
requires a more thorough explanaon.
• Instrucons regarding inspecons to be made on unit parts or systems may also be included.

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ADDITIONALINFORMATIONABOUTSAFETY
GENERAL INFORMATION
1.3 Addional informaon about safety
!DANGER
• DO NOT CONNECT THE POWER SUPPLY TO THE INDOOR UNIT PRIOR TO FILLING THE SPACE
HEATING CIRCUIT (AND DHW CIRCUIT IF IT WAS THE CASE) WITH WATER AND CHECKING
WATER PRESSURE AND THE TOTAL ABSENCE OF ANY WATER LEAKAGE.
• Do not pour water over the indoor unit electrical parts. If the electrical components are in
contact with water a seri ous electrical shock will take place.
• Do not touch or adjust the safety devices inside the air to water heat pump. If these devices
are touched or adjusted, a serious accident can take place.
• Do not open the service cover or access inside the air to water heat pump without
disconnecng the main power supply.
• In case of re Turn OFF the main switch, put out the re at once and contact your service
contractor.
• It must ensure that the air to water heat pump cannot op erate accidentally without water
neither with air inside hydraulic system.
!CAUTION
• Do not use any sprays such as inseccide, lacquer, hair spray or other ammable gases within
approximately one meter from the system.
• If installaon circuit breaker or the unit fuse is oen acvated, stop the system and contact your
service contractor.
• Do not make service or inspecons tasks by yourself. This work must be performed by a qualied
service person.
• This appliance must be used only by adult and capable people, having received the technical
informaon or instrucons to handle this appliance properly and safely.
• Children should be supervised to ensure that they do not play with the appliance.
• Do not let any foreign body into the water inlet and outlet piping of the air to water heat pump.

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IMPORTANTNOTICE
GENERAL INFORMATION
1.4 Important noce
• Verify, in accordance with the manuals which appear in the outdoor and indoor units, that all
the informaon required for the correct installaon of the system is included. If this is not the
case, contact your distributor.
• Hitachi pursues a policy of connuous improvement in product design and performance. The
right is therefore reserved to vary specicaons without noce.
• Hitachi cannot ancipate every possible circumstance that might involve a potenal hazard.
• This air to water heat pump has been designed for standard water heang for human beings
only. Do not use this for other purposes such as for drying clothes, heang foods or for any
other heang process (except swimming pool).
• No part of this manual may be reproduced without wrien permission.
• If you have any quesons, contact your service contractor of Hitachi.
• Check and make sure that the explanaons of each part of this manual correspond to your air to
water heat pump model.
• Refer to the models codicaon to conrm the main characteriscs of your system.
• Signal words (NOTE, DANGER and CAUTION) are used to idenfy levels of hazard seriousness.
Denions for idenfying hazard levels are provided in inial pages of this document.
• The operaon modes of these units are controlled by the unit controller.
• This manual should be considered as a permanent part of the air to water heat pump. It gives
a common descripon of and informaon for this air to water heat pump which you operate as
well as for other models.
• Keep the water temperature of the system above the freezing temperature.

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PRODUCTGUIDE
GENERAL INFORMATION
1.5 Product guide
1.5.1 Classicaon of the units
1.5.1.1 Split system - Indoor unit - YUTAKI S
Unit type: YUTAKI S (Split system - Single water module (Indoor unit) - Medium/Low temperature)
Posion-separang hyphen (xed)
Compressor power of the combined outdoor unit (HP): 1.5, 2.0, 2.5, 3.0
R: R32 refrigerant
2: series
Made in Europe
RWM -X.X R 2 E
1.5.2 Product list
1.5.2.1 Split system - Indoor unit - YUTAKI S
()()()()
~ 230V 50Hz
3N~ 400V 50Hz
RWM-1.5R2E RWM-1.5R2E
RWM-2.0R2E RWM-2.0R2E
RWM-2.5R2E RWM-2.5R2E
RWM-3.0R2E RWM-3.0R2E
NOTE
Icons between brackets means possible extra operaons to the factory-supplied operaons. For
cooling operaon, refer to the Cooling kit accessory for YUTAKI S units.

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NAME OF PARTS AND DIMENSIONAL DATA
Name of parts and dimensional data
2.1 YUTAKI S- RWM-(1.5-3.0)R2E............................................................................8

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YUTAKI S- RWM-(1.5-3.0)R2E
NAME OF PARTS AND DIMENSIONAL DATA
2.1 YUTAKI S - RWM-(1.5-3.0)R2E
NOTE
Water ow direcon
Units in mm
View from A
Wall support dimensions
XEKS2012_r0
Water
Liquid
Gas
Wall xing holes
Side view
Front view
1. Plate heat exchanger
2. Water pump
3. Electric water heater
4. Expansion vessel 6L
5. Water strainer
6. Air purger
7. Water pressure sensor
8. Safety valve
9. Drain pipe for safety valve
10. Expansion valve
11. Manometer
12. Refrigerant strainer (x2)
13. Unit controller
14. Electrical box
15. Switch for DHW emergency operaon
16. Water inlet pipe connecon - G 1” Female
17. Water outlet pipe connecon - G 1” Female
18. Refrigerant gas pipe connecon - Ø12.7 (1/2”)
19. Refrigerant liquid pipe connecon - Ø6.35 (1/4”)
20. Shut-down valve (Factory-supplied accessory)
21. Thermistor (Water inlet pipe)
22. Thermistor (Water outlet pipe)
23. Thermistor (Water outlet PHEX)
24. Thermistor (Liquid refrigerant pipe)
25. Thermistor (Gas refrigerant pipe)

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ELECTRICAL DATA
Electrical data
3.1 Consideraons.................................................................................................10
3.2 Split system- Indoor unit- YUTAKI S ................................................................11

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CONSIDERATIONS
ELECTRICAL DATA
3.1 Consideraons
Key words:
• U: Power supply.
• PH: Phase.
• IPT: Total input power.
• STC: Starng current: Less than maximum current.
• RNC: Running current.
• MC: Maximum current.
NOTE
• Heang condions: Inlet/outlet water temperature: 30/35 °C ; Outdoor ambient temperature
(DB/WB): 7/6 °C
• The compressor data shown in the tables below are based on a combined capacity of 100% of
the power supplied.
• The “Maximum current” shown in the above table is the maximum total unit running current at
the following condions:
»Supply voltage: 90% of the rated voltage.
»Unit capacity: 100% at maximum operang condions.
• The power supply cables must be sized to cover this maximum current value.
• Specicaons in these tables are subject to change without noce in order that Hitachi may
bring the latest innovaons to their customers.
• Please refer to the general informaon, cauons and notes regarding protecve devices (CB,
ELB) throughout the “Electrical and control sengs” chapter.

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SPLIT SYSTEM- INDOOR UNIT- YUTAKI S
ELECTRICAL DATA
3.2 Split system - Indoor unit - YUTAKI S
Model Power supply
Applicable
voltage
Operaon mode RNC
(A)
IPT
(kW)
MC
(A)
Max
IPT
(kW)
U max
(V)
U min
(V)
RWM-1.5R2E
~ 230V 50Hz 253 207
Without electric heater 0.53 0.06 0.63 0.06
With electric heater 13.65 3.06 13.67 3.06
With DHW tank heater 12.56 2.81 12.59 2.81
With electric and DHW tank heaters 25.61 5.81 25.63 5.81
3N~ 400V 50Hz 440 360
Without electric heater 0.53 0.06 0.63 0.06
With electric heater 4.76 3.06 4.96 3.06
With DHW tank heater 4.17 2.81 12.59 2.81
With electric and DHW tank heaters 8.57 5.81 16.92 5.81
RWM-2.0R2E
~ 230V 50Hz 253 207
Without electric heater 0.53 0.06 0.63 0.06
With electric heater 13.65 3.06 13.67 3.06
With DHW tank heater 12.56 2.81 12.59 2.81
With electric and DHW tank heaters 25.61 5.81 25.63 5.81
3N~ 400V 50Hz 440 360
Without electric heater 0.53 0.06 0.63 0.06
With electric heater 4.76 3.06 4.96 3.06
With DHW tank heater 4.17 2.81 12.59 2.81
With electric and DHW tank heaters 8.57 5.81 16.92 5.81
RWM-2.5R2E
~ 230V 50Hz 253 207
Without electric heater 0.53 0.06 0.63 0.06
With electric heater 13.65 3.06 13.67 3.06
With DHW tank heater 12.56 2.81 12.59 2.81
With electric and DHW tank heaters 25.61 5.81 25.63 5.81
3N~ 400V 50Hz 440 360
Without electric heater 0.53 0.06 0.63 0.06
With electric heater 4.76 3.06 4.96 3.06
With DHW tank heater 4.17 2.81 12.59 2.81
With electric and DHW tank heaters 8.57 5.81 16.92 5.81
RWM-3.0R2E
~ 230V 50Hz 253 207
Without electric heater 0.53 0.06 0.63 0.06
With electric heater 13.65 3.06 13.67 3.06
With DHW tank heater 12.56 2.81 12.59 2.81
With electric and DHW tank heaters 25.61 5.81 25.63 5.81
3N~ 400V 50Hz 440 360
Without electric heater 0.53 0.06 0.63 0.06
With electric heater 4.76 3.06 4.96 3.06
With DHW tank heater 4.17 2.81 12.59 2.81
With electric and DHW tank heaters 8.57 5.81 16.92 5.81
NOTE
The data corresponding to DHW tank heater is calculated in combinaon with the domesc hot
water tank accessory “DHWT‑(200/300)S‑3.0H2E”.