Hitachi RAS-3HVRNS3, RAS-3HVNC1, RAS-2.5HVNP1, RAS-2HVNP1 Installation And Operation Manual

UTOPIA IVX PREMIUM / IVX STANDARD SERIES
RAS-(2/2.5)HVNP1 / RAS-3HVNC1
UTOPIA ES SERIES
RAS-3HVRNS3

INSTALLATION AND OPERATION MANUAL

English

Specications in this manual are subject to change without notice in order that HITACHI may bring the latest innovations to
their customers. Whilst every effort is made to ensure that all specications are correct, printing errors are beyond Hitachi’s
control; HITACHI cannot be held responsible for these errors.

CAUTION

This product shall not be mixed with general house waste at the end of its life and it shall be retired according to the
appropriated local or national regulations in a environmentally correct way.
Due to the refrigerant, oil and other components contained in Air Conditioner, its dismantling must be done by a pro­fessional installer according to the applicable regulations.
Contact to the corresponding authorities for more information.

English

From 4th July 2007 and following Regulation EC Nº 842/2006 on Certain Fluorinated Greenhouse gases, it is mandatory to ll in the label attached to the unit
with the total amount of refrigerant charged on the installation.

Do not vent R410A/R407C into the atmosphere: R410A & R407C are uorinated greenhouse gases covered by the Kyoto protocol global warming potential
(GWP) R410A/R407C: = 1975/1652.5.

English

Instructions to ll in the "F-Gas Label":

1.- Fill in the Label with indelible ink the refrigerant amounts:



- Factory Charge,  - Additional Charge &  - Total Charge.

2.- Stick the Protection Plastic Film on the F-Gas Label (delivered in a plastic bag with the Manual). To see Figure nº 2.

Figure 1. F-Gas Label with Protection Plastic Film Figure 2. Protection Plastic Film

Protection Plastic Film

Adhesive Surface

Peel-off Paper

MODELS CODIFICATION

Important note: Please, check, according to the model name, which is your air conditioner type,

how it is abbreviated and referred to in this instruction manual. This Installation and Opera­tion Manual is only related to Indoor Units FSN(H)(2/3/4)(M/E)(i)(k) combined with Outdoor Units
HVN(P/C)1 & RAS-3HVRNS3.



IVX Premium series

OUTDOOR UNIT · UNIDAD EXTERIOR · AUßENEINHEIT · UNITÉ EXTÉRIEURE · UNITÀ ESTERNA ·

UNIDADE EXTERIOR · UDENDRS AGGREGAT · BUITENTOESTEL · UTOMHUSENHET · ΕΞΩΤΕΡΙΚΗ ΜΟΝΑΔΑ

HEAT PUMP MODELS - MODELOS CON BOMBA DE CALOR

WÄRMEPUMPENMODELLE - MODÈLES POMPE À CHALEUR

MODELLI POMPA DI CALORE - MODELOS BOMBA DE CALOR

VARMEPUMPEMODELLER - MODELLEN MET WARMTEPOMP

MODELLER ENDAST FÖR KYLNINGSFUNKTION - ΜΟΝΤΕΛΑ ΜΕ ΑΝΤΛΙΑ ΘΕΡΜΟΤΗΤΑΣ

Single Phase - Monofásico - Einphasig - Monophasé - Monofase

Monofásico - Enfaset - Eenfasig - En fas - Μονοφασικά

1~ 230V 50Hz

Unit

RAS-2HVNP1

RAS-2.5HVNP1



IVX Standard series

OUTDOOR UNIT · UNIDAD EXTERIOR · AUßENEINHEIT · UNITÉ EXTÉRIEURE · UNITÀ ESTERNA ·

UNIDADE EXTERIOR · UDENDRS AGGREGAT · BUITENTOESTEL · UTOMHUSENHET · ΕΞΩΤΕΡΙΚΗ ΜΟΝΑΔΑ

HEAT PUMP MODELS - MODELOS CON BOMBA DE CALOR

WÄRMEPUMPENMODELLE - MODÈLES POMPE À CHALEUR

MODELLI POMPA DI CALORE - MODELOS BOMBA DE CALOR

VARMEPUMPEMODELLER - MODELLEN MET WARMTEPOMP

MODELLER ENDAST FÖR KYLNINGSFUNKTION - ΜΟΝΤΕΛΑ ΜΕ ΑΝΤΛΙΑ ΘΕΡΜΟΤΗΤΑΣ

Single Phase - Monofásico - Einphasig - Monophasé - Monofase

Monofásico - Enfaset - Eenfasig - En fas - Μονοφασικά

1~ 230V 50Hz

Unit

RAS-3HVNC1



ES series

OUTDOOR UNIT · UNIDAD EXTERIOR · AUßENEINHEIT · UNITÉ EXTÉRIEURE · UNITÀ ESTERNA ·

UNIDADE EXTERIOR · UDENDRS AGGREGAT · BUITENTOESTEL · UTOMHUSENHET · ΕΞΩΤΕΡΙΚΗ ΜΟΝΑΔΑ

HEAT PUMP MODELS - MODELOS CON BOMBA DE CALOR

WÄRMEPUMPENMODELLE - MODÈLES POMPE À CHALEUR

MODELLI POMPA DI CALORE - MODELOS BOMBA DE CALOR

VARMEPUMPEMODELLER - MODELLEN MET WARMTEPOMP

MODELLER ENDAST FÖR KYLNINGSFUNKTION - ΜΟΝΤΕΛΑ ΜΕ ΑΝΤΛΙΑ ΘΕΡΜΟΤΗΤΑΣ

Single Phase - Monofásico - Einphasig - Monophasé - Monofase

Monofásico - Enfaset - Eenfasig - En fas - Μονοφασικά

1~ 230V 50Hz

Unit

RAS-3HVRNS3

INDEX ÍNDICE

PART I OPERATION

1. GENERAL INFORMATION

2. SAFETY

3. PRODUCT GUIDE

4. IMPORTANT NOTICE

5. SYSTEM DESCRIPTION

6. TRANSPORTATION AND HANDLING

7. BEFORE OPERATION

8. REMOTE CONTROLLER OPERATION

9. AUTOMATIC CONTROLS

10. BASIC TROUBLESHOOTING

PART II INSTALLATION

11. NAME OF PARTS

12. REFRIGERANT CYCLE

13. UNITS INSTALLATION

14. REFRIGERANT PIPING & REFRIGERANT CHARGE

15. DRAIN PIPING

16. ELECTRIC WIRING

17. INSTALLATION OF REMOTE CONTROLLER

18. TEST RUNNING

19. SAFETY SUMMARY & CONTROL DEVICE SETTING

20. TROUBLESHOOTING

1ª PARTE: FUNCIONAMIENTO

1. INFORMACIÓN GENERAL

2. SEGURIDAD

3. GUÍA DE PRODUCTO

4. AVISO IMPORTANTE

5. DESCRIPCIÓN DEL SISTEMA

6. TRANSPORTE Y MANIPULACIÓN

7. ANTES DEL FUNCIONAMIENTO

8. FUNCIONAMIENTO DEL CONTROL REMOTO

9. CONTROLES AUTOMÁTICOS

10. RESOLUCIÓN DE PROBLEMAS BÁSICOS

2ª PARTE: INSTALACIÓN

11. NOMBRE DE LAS PIEZAS

12. CICLO DE REFRIGERANTE

13. INSTALACIÓN DE LAS UNIDADES

14. TUBERÍA Y CARGA DE REFRIGERANTE

15. TUBERÍA DE DESAGÜE

16. CABLEADO ELÉCTRICO

17. INSTALACIÓN DEL CONTROL REMOTO

18. PRUEBA DE FUNCIONAMIENTO

19. RESUMEN DE SEGURIDAD Y AJUSTE DE LOS

DISPOSITIVOS DE CONTROL

20. RESOLUCIÓN DE PROBLEMAS

INHALTSVERZEICHNIS INDEX

TEIL I – BETRIEB

1. ALLGEMEINE INFORMATIONEN

2. SICHERHEIT

3. PRODUKTÜBERSICHT

4. WICHTIGER HINWEIS

5. SYSTEMBESCHREIBUNG

6. TRANSPORT UND BEDIENUNG

7. VOR DER INBETRIEBNAHME

8. BETRIEB MIT FERNBEDIENUNG

9. AUTOMATISCHE STEUERUNG

10. GRUNDLEGENDE FEHLERBESEITIGUNG

TEIL II – INSTALLATION

11. TEILEBEZEICHNUNG

12. KÜHLKREISLAUF

13. GERÄTEINSTALLATION

14. KÄLTEMITTELROHRE UND KÄLTEMITTELMENGE

15. ZUSÄTZLICHE KÜHLMITTELMENGE

16. VERKABELUNG

17. INSTALLATION EINER FERNBEDIENUNG

18. TESTLAUF

19. SICHERHEITSÜBERSICHT UND EINSTELLUNG DER
STEUERGERÄTE

20. FEHLERBEHEBUNG

PARTIE I – FONCTIONNEMENT

1. INFORMATIONS GÉNÉRALES

2. SÉCURITÉ

3. GUIDE DU PRODUIT

4. REMARQUES IMPORTANTES

5. DESCRIPTION DU SYSTÈME

6. TRANSPORT ET MANIPULATION

7. AVANT L’UTILISATION

8. FONCTIONNEMENT DE LA TÉLÉCOMMANDE

9. CONTRÔLES AUTOMATIQUES

10. DÉPANNAGE DE BASE

PARTIE II – INSTALLATION

11. NOMENCLATURE DES PIÈCES

12. CYCLE DU FLUIDE FRIGORIGÈNE

13. INSTALLATION DES UNITÉS

14. TUYAUTERIE DU FLUIDE FRIGORIGÈNE ET
CHARGE DU FLUIDE FRIGORIGÈNE

15. TUYAUTERIE D’ÉVACUATION DES CONDENSATS

16. CÂBLAGE ÉLECTRIQUE

17. INSTALLATION DE LA TÉLÉCOMMANDE

18. TEST DE FONCTIONNEMENT

19. SOMMAIRE DES DISPOSITIFS DE SÉCURITÉ &
RÉGLAGE DES ORGANES DE CONTRÔLE

20. DEPANNAGE

INDICE ÍNDICE

PARTE I FUNZIONAMENTO

1. INFORMAZIONI GENERALI

2. SICUREZZA

3. GUIDA DEL PRODOTTO

4. NOTA IMPORTANTE

5. DESCRIZIONE DEL SISTEMA

6. TRASPORTO E MOVIMENTAZIONE

7. PROCEDURA PRELIMINARE

8. FUNZIONAMENTO DEL COMANDO REMOTO

9. CONTROLLI AUTOMATICI

10. RISOLUZIONE DEI PROBLEMI MINORI

PART II INSTALLAZIONE

11. NOMENCLATURA DEI COMPONENTI

12. CICLO REFRIGERANTE

13. INSTALLAZIONE DELLE UNITÀ

14. LINEA DEL REFRIGERANTE E CARICA DI
REFRIGERANTE

15. LINEA DI DRENAGGIO

16. COLLEGAMENTI ELETTRICI

17. INSTALLAZIONE DEL COMANDO REMOTO

18. PROVA DI FUNZIONAMENTO

19. PRECAUZIONI PER LA SICUREZZA E IMPOSTAZIONI

DEI DISPOSITIVI DI CONTROLLO

20. ELIMINAZIONE DEI GUASTI

PARTE I FUNCIONAMENTO

1. INFORMAÇÃO GERAL

2. SEGURANÇA

3. GUIA DO PRODUTO

4. NOTA IMPORTANTE

5. DESCRIÇÃO DO SISTEMA

6. TRANSPORTE E MANUSEAMENTO

7. ANTES DE ARRANCAR A UNIDADE

8. FUNCIONAMENTO DO CONTROLO REMOTO

9. CONTROLOS AUTOMÁTICOS

10. RESOLUÇÃO DE PROBLEMAS BÁSICOS

PARTE II INSTALAÇÃO

11. NOME DAS PEÇAS

12. CICLO DE REFRIGERAÇÃO

13. INSTALAÇÃO DAS UNIDADES

14. TUBAGEM DE REFRIGERANTE E CARGA DE
REFRIGERANTE

15. TUBAGEM DE ESGOTO

16. LIGAÇÕES ELÉCTRICAS

17. INSTALAÇÃO DO CONTROLO REMOTO

18. PROVA DE FUNCIONAMENTO

19. SUMÁRIO DE SEGURANÇA E AJUSTE DE

DISPOSITIVO DE CONTROLO

20. RESOLUÇÃO DE PROBLEMAS

INDHOLDSFORTEGNELSE INHOUDSOPGAVE

DEL I - BETJENING

1. GENEREL INFORMATION

2. SIKKERHED

3. PRODUKTVEJLEDNING

4. VIGTIG MEDDELELSE

5. SYSTEMBESKRISELVE

6. TRANSPORT OG HÅNDTERING

7. FØR OPERATION

8. FJERNBETJENING

9. AUTOMATISK KONTROLLER

10. BASIS FEJLFINDING

DEL II- MONTERING

11. NAVN PÅ DELE

12. KØLEKREDSLØB

13. MONTERING AF ENHEDER

14. KØLERØRSYSTEM OG PÅFYLDNING AF
KØLEMIDDEL

15. AFLØBSRØR

16. ELEKTRISK LEDNINGSFØRING

17. MONTERING AF FJERNBETJENING

18. TESTKØRSEL

19. OVERSIGT OVER INDSTILLINGER FOR
SIKKERHEDS- OG KONTROLENHEDER

20. FEJLFINDING

DEEL I BEDIENING

1. ALGEMENE INFORMATIE

2. VEILIGHEID

3. PRODUCTGIDS

4. BELANGRIJKE MEDEDELING

5. SYSTEEMBESCHRIJVING

6. TRANSPORT EN HANTERING

7. VOORDAT U HET SYSTEEM IN GEBRUIK NEEMT

8. GEBRUIK VAN DE EXTERNE BEDIENING

9. AUTOMATISCHE BESTURING

10. ELEMENTAIRE PROBLEMEN OPLOSSEN

DEEL II INSTALLATIE

11. NAMEN VAN ONDERDELEN

12. KOUDEMIDDELCYCLUS

13. INSTALLATIE VAN DE UNITS

14. KOELMIDDELLEIDINGEN & KOELMIDDEL VULLEN

15. AFVOERLEIDING

16. ELEKTRISCHE BEDRADING

17. INSTALLATIE VAN AFSTANDSBEDIENING

18. PROEFDRAAIEN

19. VEILIGHEIDSSAMENVATTING
& BESTURINGSINRICHTING

20. PROBLEMEN OPLOSSEN

INNEHALLSFÖRTECKNING ΕΥΡΕΤΗΡΙΟ

DEL I ANVÄNDNING

1. ALLMÄN INFORMATION

2. SÄKERHET

3. PRODUKTGUIDE

4. VIKTIG ANMÄRKNING

5. SYSTEMÖVERSKIT

6. TRANSPORT OCH HANTERING

7. FÖRE DRIFT

8. FJÄRRKONTROLL

9. AUTOMATIK KONTROLLANORDNING

10. GRUNDLÄGGANDE FELSÖKNING

DEL II INSTALLATION

11. DELARNAS NAMN

12. KYLMEDIETS CYKEL

13. INSTALLATION AV ENHETER

14. KYLRÖR & PÅFYLLNING AV KYLMEDIUM

15. DRÄNERINGSRÖR

16. ELEKTRISKA KABLAR

17. INSTALLATION AV FJÄRRKONTROLL

18. PROVKÖRNING

19. SÄKERHETSSAMMANFATTNING OCH
SÄKERHETSINSTÄLLNINGAR

20. FELSÖKNING

ΜΕΡΟΣ Ι – ΛΕΙΤΟΥΡΓΙΑ

1. ΓΕΝΙΚΕΣ ΠΛΗΡΟΦΟΡΙΕΣ

2. ΑΣΦΆΛΕΙΑ

3. ΟΔΗΓΟΣ ΠΡΟΪΟΝΤΟΣ

4. ΣΗΜΑΝΤΙΚΗ ΠΑΡΑΤΗΡΗΣΗ

5. ΠΡΙΝ ΤΗ ΛΕΙΤΟΥΡΓΙΑ

6. ΜΕΤΑΦΟΡΆ ΚΑΙ ΧΕΙΡΙΣΜΌΣ

7. ΠΡΙΝ ΤΗ ΛΕΙΤΟΥΡΓΙΑ

8. ΛΕΙΤΟΥΡΓΙΑ ΤΗΛΕΧΕΙΡΙΣΤΗΡΙΟΥ

9. ΑΥΤΟΜΑΤΕΣ ΛΕΙΤΟΥΡΓΙΕΣ

10. ΑΝΤΙΜΕΤΩΠΙΣΗ ΠΡΟΒΛΗΜΑΤΩΝ - ΒΑΣΙΚΑ

ΜΕΡΟΣ ΙΙ – ΕΓΚΑΤΑΣΤΑΣΗ

11. ΟΝΟΜΑΤΑ ΕΞΑΡΤΗΜΑΤΩΝ

12. ΚΥΚΛΟΣ ΨΥΞΗΣ

13. ΕΓΚΑΤΑΣΤΑΣΗ ΕΣΩΤΕΡΙΚΩΝ ΜΟΝΑΔΩΝ

14. ΣΩΛΗΝΩΣΕΙΣ ΨΥΚΤΙΚΟΥ & ΠΛΗΡΩΣΗ ΜΕ
ΨΥΚΤΙΚΟ ΜΕΣΟ

15. ΣΩΛΗΝΩΣΕΙΣ ΑΠΟΧΕΤΕΥΣΗΣ

16. ΗΛΕΚΤΡΙΚΗ ΚΑΛΩΔΙΩΣΗ

17. ΕΓΚΑΤΑΣΤΑΣΗ ΤΟΥ ΧΕΙΡΙΣΤΗΡΙΟΥ

18. ΔΟΚΙΜΑΣΤΙΚΗ ΛΕΙΤΟΥΡΓΙΑ

19. ΣΥΝΟΠΤΙΚΕΣ ΠΡΟΦΥΛΑΞΕΙΣ ΑΣΦΑΛΕΙΑΣ
& ΡΥΘΜΙΣΕΙΣ ΣΥΣΚΕΥΩΝ ΕΛΕΓΧΟΥ

20. ΑΝΤΙΜΕΤΩΠΙΣΗ ΠΡΟΒΛΗΜΑΤΩΝ

EN English Original version

ES Español Versión traducida

DE Deutsch Übersetzte Version

FR Français Version traduite

IT Italiano Versione tradotta

PT Português Versão traduzidal

DA Dansk Oversat version

NL Nederlands Vertaalde versie

SV Svenska Översatt version

EL Ελληνικα Μεταφρασμένη έκδοση

General information

1

PMML0318A - P5415337

ENGLISH

PART I- OPERATION

1.2 ENVIRONMENT-FRIENDLY UNITS

1 GENERAL INFORMATION

1.1 GENERAL NOTES

© Copyright 2014 HITACHI Air Conditioning Products Europe,
S.A.U – All rights reserved.

No part of this publication may be reproduced, copied, led or
transmitted in any shape or form without the permission of
HITACHI Air Conditioning Products Europe, S.A.U.

Within the policy of continuous improvement of its products,
HITACHI Air Conditioning Products Europe, S.A.U. reserves the
right to make changes at any time without prior notication and
without being compelled to introducing them into products subse-

quently sold. This document may therefore have been subject to
amendments during the life of the product.

HITACHI makes every effort to offer correct, up-to-date docu­mentation. Despite this, printing 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, illustrations and descriptions included
in this manual.

This range of HITACHI outdoor units uses environmentally-frien­dly R410A gas refrigerant, and the RoHS and Green Dot regula­tions are applied throughout the manufacturing and installation
process to reect HITACHI’s awareness of environmental respect
and commitment.

2 SAFETY

2.1 APPLIED SYMBOLS

During normal air conditioning system design work or unit insta­llation, greater attention must be paid in certain situations requi­ring particular care in order to avoid injuries an damage to the
unit, the installation or the building or property.

Situations that jeopardise the safety of those in the surrounding
area or that put the unit itself a risk will be clearly indicated in this
manual.

To indicate these situations, a series of special symbols will be
used to clearly identify these situations.

Pay close attention 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 information and
instructions relating directly to your safety and physical
wellbeing.

• Not taking these instructions into account could lead to
serious, very serious or even fatal injuries to you and
others in the proximities of the unit.

In the text following the danger symbol you can also nd informa­tion on safe procedures during unit installation.

CAUTION

• The text following this symbol contains information and ins­tructions relating directly to your safety and physical wellbeing.

• Not taking these instructions into account could lead to minor
injuries to you and others in the proximities of the unit.

• Not taking these instructions into account could lead to unit
damage.

In the text following the caution symbol you can also nd informa­tion on safe procedures during unit installation.

NOTE

• The text following this symbol contains information or instruc­tions that may be of use or that require a more thorough ex­planation.

• Instructions regarding inspections to be made on unit parts or
systems may also be included.

1

2

PMML0318A - P5415337

Product guide

DANGER

• Do not pour water into the indoor or outdoor unit. The­se products are equipped with electrical parts. If water
contacts with electrical components then it will cause a
serious electrical shock.

• Do not touch or adjust safety devices inside the indoor or
outdoor units. If these devices are touched or adjusted, it
may cause a serious accident.

• Do not open the service cover or access the indoor or
outdoor units without disconnecting the main power
supply.

• In case of re Turn OFF the main switch, put out the re
at once and contact your service contractor.

CAUTION

• Do not use any sprays such as insecticide, lacquer, hair spray

or other ammable gases within approximately one (1) meter

from the system.

• If circuit breaker or fuse is often activated, stop the system
and contact your service contractor.

• Do not make service or inspections tasks by yourself. This

works must be performed by qualied service person.

• Do not put any strange material (sticks, etc...) into the air inlet
and outlet. These units have high speed rotating fans and it is
dangerous that any object touches them.

• Refrigerant leakage can cause difculty with breathing due to

insufcient air.

• This appliance must be used only by adult and capable
people, having received the technical information or instruc­tions to handle properly and safely this appliance.

• Children should be supervised to ensure that they do not play
with the appliance.

NOTE

It is recommended to ventilate the room every 3 or 4 hours.

2.2 ADDITIONAL INFORMATION ABOUT SAFETY

3 PRODUCT GUIDE

3.1 CLASSIFICATION OF IVX OUTDOOR UNITS MODELS

Unit type (Outdoor unit): RAS

Position-separating hyphen (xed)

Compressor power (HP): 2, 2.5, 3

H = Heat pump

V = Single phase unit (1~ 230V 50Hz)

N = R410A refrigerant

P: Premium series
C: Standard series

Series

RAS – X H V N X 1

3.2 CLASSIFICATION OF ES OUTDOOR UNITS MODELS

Unit type (Outdoor unit): RAS

Position-separating hyphen (xed)

Compressor power (HP): 3

H = Heat pump

V = Single phase unit (1~ 230V 50Hz)

R = Inverter system

N = R410A refrigerant

S: ES series

Series

RAS – X H V R N S 3

3

Important notice

3

PMML0318A - P5415337

ENGLISH

4 IMPORTANT NOTICE

• Verify, in accordance with the manuals which appear in the
outdoor and indoor units, that all the information required for
the correct installation of the system is included. If this is not
the case, contact your distributor.

• HITACHI pursues a policy of continuing improvement
in design and performance of products. The right is therefore
reserved to vary specications without notice.

• HITACHI cannot anticipate every possible circumstance that
might involve a potential hazard.

• This air conditioner has been designed for standard air condi­tioning for human beings. For use in other applications, plea­se contact your HITACHI dealer or service contractor.

• No part of this manual may be reproduced without written per­mission.

• If you have any questions, contact your service contractor of
HITACHI.

• This manual should be considered as a permanent part of the

air conditioner. This manual gives a common description and
information for this air conditioner which you operate as well
as for other models.

• Check and make sure that the explanations of each part of
this manual correspond to your air conditioner model.

• Refer to the models codication to conrm the main characte­ristics of your system.

• Signal words (DANGER, WARNING and CAUTION) are used
to identify levels of hazard seriousness. Denitions for iden­tifying hazard levels are provided below with their respective
signal words.

• It is assumed that this unit will be operated and serviced by
English speaking people. If this is not the case, the customer
should add safety, caution and operating signs in the native
language of the personal.

• This air conditioner has been designed for the following tem­perature. Operate the air conditioner within this range:

Temperature

Maximum Minimum

Cooling mode

Indoor 32°C DB/23°C WB 21°C DB/15°C WB
Outdoor 46°C DB (*) -5°C DB

Heating mode

Indoor 27°C DB 15°C DB

Outdoor 15°C WB -20°C WB

DB: Dry Bulb Temperature
WB: Wet Bulb Temperature (*) 43ºC RAS-3HVRNS3

• These operations modes are controlled by the remote control
switch.

DANGER

Pressure Vessel and Safety Device: This air conditio­ner is equipped with a high pressure vessel under PED
(Pressure Equipment Directive). The pressure vessel has
been designed and tested before shipment according to
PED. Also, in order to prevent the system from an abnor­mal pressure, a high pressure switch, which needs no
eld adjustment, is utilized in the refrigeration system.
Therefore, this air conditioner is protected from abnormal
pressures. However, if abnormally high pressure is applied to
the refrigeration cycle including the high pressure vessel(s),
it will result in serious injury or death due to explosion of
the pressure vessel. Do not apply a pressure higher than the
following pressure to the system, by modifying or changing
the high pressure switch.

CAUTION

This unit is designed for commercial and light industrial applica­tion. If installed in house hold appliance, it could cause electro­magnetic interference.

Start-up and Operation: Check to ensure that all the stop valves
are fully opened and no obstacle exists at the inlet/outlet sides
before start-up and during the operation.

Maintenance: Periodically check the high pressure side pressu-
re. If the pressure is higher than the maximum allowable pressu­re, stop the system and clean the heat exchanger or remove the
cause.

4

Maximum allowable pressure and high pressure cut-out value:

Outdoor unit model Refrigerant

Maximun allowable

pressure (MPa)

High pressure switch cut-out

value (MPa)

RAS-2HVNP1
RAS-2.5HVNP1

R410A 4.15 4.00 ~ 4.10

RAS-3HVNC1 R410A 4.15 4.00 ~ 4.10

RAS-3HVRNS3 R410A 4.15 4.00 ~ 4.10

4

PMML0318A - P5415337

System description5

NOTE

The label for the vessel under PED are attached on the high pres­sure vessel. The pressure vessel capacity and vessel category
are indicated on the vessel.

Location of High Pressure Switch

Compressor

NOTE

The high pressure switch is indicated on the electrical wiring
diagram in the outdoor unit as PSH connected to printed circuit

board (PCB1) in the outdoor unit.

Structure of High Pressure Switch

Contact point

Pressure detected

Connected to the electrical wire

DANGER

• Do not change the high-pressure switch locally or chan­ge the high pressure cut-out set value locally. If changed,
it will cause serious injury or death due to explosion.

• Do not attempt to turn service valve rod beyond its stop.

5 SYSTEM DESCRIPTION

• Long piping for high-rise buildings.

• Various combinations of indoor units type.

• Flexibility of indoor unit control.

• High reliability.

• Space saving.

• Easy installation.

Maximum piping length Lo-i:

- Actual length

- Equivalent length

50
70

Maximum height difference Ho-i:

- Outdoor unit is higher than indoor unit

- Indoor unit is higher than outdoor unit

30
20

NOTE

RCI-FSN3 (High efciency – 4 step fan speed) indoor unit can connect in 1 indoor unit combination only. For use in 2 indoor units

combination, please contact your Hitachi dealer or service contractor.

6 TRANSPORTATION AND HANDLING

When hanging the unit, ensure a balance of the unit, check safety
and lift it up smoothly.

Do not remove any packing materials.

Hang the unit under packing condition with two ropes.

For safety reasons ensure that the outdoor unit is lifted smoothly
and does not lean.

Model

Unit Gross Weight

(kg)

RAS-(2-2.5)HVNP1 48

RAS-3HVNC1 49

RAS-3HVRNS3 49

1

515 mm

180 mm

275 mm

Center of
gravity

Before operation

5

PMML0318A - P5415337

ENGLISH

8 REMOTE CONTROLLER OPERATION

It is advisable to use PC-ART or PC-ARF remote controller (both optional). For more information about it installation and operation,
please refer to its corresponding Installation and Operation Manuals.

7

7 BEFORE OPERATION

CAUTION

• Supply electrical power to the system for approximately 12
hours before start-up or a long shutdown. Do not start the
system immediately after power supply, it may cause a com­pressor failure because the compressor is not heated well.

• When the system is started after a shutdown longer that ap­proximately 3 months, it is recommended to check the system
by your service contractor.

• Turn OFF the main switch when the system is to be stopped
for a long period of time: If the main switch is not turned OFF,
electricity will be used, because the oil heater is always ener­gised during compressor stopping.

• Make sure that the outdoor unit is not covered with snow or

ice. If covered, remove it by using hot water (approximately
50°C). If the water temperature is higher that 50°C, it will cau-

se damage to plastic parts.

9 AUTOMATIC CONTROLS

The system is equipped with the following functions.



Three minute guard

The compressor remains off for at least 3 minutes once it has stop­ped. If the system is started within approximately 3 minutes after it
has stopped, the RUN indicator is activated. However, the cooling
operation or the heating operation remains off and does not start
until after 3 minutes has elapsed.

Operation may stop for 6 minutes maximum to protect compressor.



Frost prevention during cooling operation

When the system is operated in a low temperature room, the coo­ling operation may be changed to fan operation for a while to
avoid frost formation on the indoor heat exchanger.



Automatic restart after power failure

If the power supply is interrupted for short periods of time (up to
2 seconds) the Remote Control switch will retain the settings and
the unit will restart when the power is restored.

If Automatic Restart is required after periods of lost power supply
in excess of 2 seconds please contact your distributor (optional
function).



Slow air control during heating operation

When the compressor is stopped while the thermostat is OFF, or
the system is performing the automatic defrosting operation, the
fan speed is set at the slow position.



Automatic defrosting cycle

When the heating operation is stopped by pressing RUN/STOP
switch, frosting on the outdoor unit is checked and the defrosting
operation may be performed for the maximum of 10 minutes.



Prevention of overload operation

When the outdoor temperature is too high during heating opera­tion, heating operation is stopped due to activation of the outdoor
thermistor until the temperature becomes low.



Hot start during heating operation

To prevent cold air discharge, the fan speed is controlled from
the slow position to the set position according to the discharge air
temperature. At this time the lover is xes horizontally.

6

PMML0318A - P5415337

Basic troubleshooting

10 BASIC TROUBLESHOOTING

CAUTION

• When water leakage from the indoor unit occurs, stop the
operation and contact your contractor

• When you smell or white smoke occurs from the unit, stop the
system and contact your contractor.



This is not abnormal

• Sound from deforming part

During system starting or stopping, and abrading sound might
be heard. However, this is due to thermal deformation of plastic
parts. It is not abnormal.

• Refrigerant ow sound

While the system is being started or stopping, sound from the
refrigerant ow may be heard.

• Smells from indoor unit

Smell adheres on indoor unit after a long period of time. Clean the
air lter and panels or make a good ventilation.

• Steam from outdoor heat exchanger

During defrosting operation, ice on the outdoor heat exchanger is
melted, resulting in making steam.

• Dew on air panel

When the cooling operation continues for a long period of time
under high humidity conditions (higher than 27°C DB/80% R.H.),
dew can form on the air panel.

• Dew on cabinet

When the cooling operation continues for a long period of timer
(higher than 27°C DB/80% R.H.), dew can form on the cabinet.

• Sound for the indoor unit heat exchanger

During the cooling operation, a sound may be heard from the in­door unit heat exchanger due to water freezing or melting.



No operation

Check whether the SET TEMPERATURE is set at the correct
temperature.



Not cooling well or heating well

- Check for obstruction of air ow of the outside or inside
units.

- Check if too much heat source exists in the room.

- Check if the air lter is clogged with dust.

- Check to see if the doors or windows are opened or not.

- Check if the temperature condition is not within the ope-

rating range.



Abnormal swing louver’s position

Check if the four louver’s position at the air outlet are in same
position.



If trouble still remains...

If the trouble still remains even after checking the above items,
contact your service contractor and inform the following data:

- Unit model name

- Content of trouble

- Alarm code number on liquid crystal display

NOTE

Except for a long period of shutdown, keep the main switch ON,
since the oil heater is energised when the compressor is stopped.

10

Name of parts

7

PMML0318A - P5415337

ENGLISH

PART II-INSTALLATION

11 NAME OF PARTS

If do you want more information check the technical catalogue.

RAS-(2/2.5)HVNP1 / RAS-3HVNC1 / RAS-3HVRNS3

579

600

21

26

792

69

37

298

320

340

11

No. Part Name

1 Compressor
2 Accumulator
3 Heat exchanger

4 Fan
5 Fan motor
6 Strainer
7 Distributor
8 Reversing valve
9 Expansion valve

10 Stop valve for gas line

No. Part Name

11 Stop valve for liquid line
12 Check joint for high/low pressure (Cool/Heat)
13 Control box

14 High pressure switch for protection
15 Pressure switch for control
16 Oil heater
17 Vibration isolation rubber
18 Air outlet
19 Air inlet

8

PMML0318A - P5415337

Refrigerant cycle

12 REFRIGERANT CYCLE

Refrigerant ow direction

(cooling)

Refrigerant ow direction

(heating)

Field refrigerant piping Flare connection Brazing connection

12

No. Part name

1 Compressor
2 Heat exchanger
3 Accumulator

4 Expansion valve

5 Reversing valve

6 Strainer 1/4
7 Distributor
8 Check joint

No. Part name

9 High pressure switch for protection

10 Pressure switch for control

11 Stop valve for gas line
12 Stop valve for liquid line
13 Discharge thermistor

14 Pipe thermistor
15 Ambient thermistor

Units installation

9

PMML0318A - P5415337

ENGLISH

13 UNITS INSTALLATION

13.1 OUTDOOR UNITS INSTALLATION

CAUTION

• Transport the products as close to the installation location as
practical before unpacking.

• Do not put any material on the products.

• Apply four lifting wires on to the outdoor, when lifting it by crane.

CAUTION

• Install the outdoor unit with sufcient clearance around it for
operation and maintenance as shown in the next gures.

Install the outdoor unit where good ventilation is available

• Do not install the outdoor unit where is a high level of oil mist,
salty air or sulphurous atmosphere.

• Install the outdoor unit as far as practical (being at least 3

meters) from electromagnetic wave radiator (such as medical
equipment).

• For cleaning, use noninammable and nontoxic cleaning li­quid. Use of inammable agent may cause explosion or re.

• Work with sufcient ventilation, since working in an enclosed
space may cause oxygen deciency. Toxic gas may be pro-

duced when cleaning agent is heated to high temperature by,

e.g., being exposed to re.

• Cleaning liquid shall be collected after cleaning.

• Pay attention not to clamp cables when attaching the service

cover to avoid electric shock or re.

CAUTION

• Keep clearance between the units of more than 50mm, and
avoid obstacles that may hamper air intake, when installing
more than one units together.

• Install the outdoor unit in the shade or not exposed to direct
sunshine or direct radiation from high temperature heat source.

• Do not install the outdoor unit in a space where a seasonal
wind directly blows to the outdoor fan.

• Check to ensure that the foundation is at, level and suf­ciently strong.

• Install the unit in a restricted area not accessible by the ge­neral public

• Aluminum ns have very sharp edges. Pay attention to the

ns to avoid injury.

13

13.2 INSTALLATION SPACE

≥

≥

≥≥

≥≥

10

PMML0318A - P5415337

Units installation

a) In case of front side and either of the sides are open (single unit) b) In case that surrounding wall exist (single unit)

100

500

1000

500

50

c) In case that upper side obstacles exist (single unit)

50

100

≤ 300

50

300

100

0 < L ≤ 1/2 H A ≥ 500
1/2 H < L ≤ H A ≥ 1000

d) In case that upper side obstacles exist (serial units) e) In case of front side and either of the sides are open (serial units)

200

300

0 < L ≤ 1/2 H A ≥ 500
1/2 H < L ≤ H A ≥ 1000

≤ 300

f) In case that surrounding wall exist (serial units)

0 < L ≤ 1/2 A ≥ 500
1/2 H < L ≤ H A ≥ 1000

A

L

1000

0 < L ≤ 1/2 H A ≥ 200
1/2 H < L ≤ H A ≥ 350

g) Horizontal (multiple units) h) Vertical (multiple units)

0 < L ≤ 1/2 H A ≥ 100
1/2 H < L ≤ H A ≥ 200

≥ 1000

≥ 400

≥ 2000

≥ 250

400

≥ 250

≥ 250

400

250

≥ 250

Do not stack more than two units in height.

Close gap (*) to avoid recirculating discharge air ow.

13

Units installation

11

PMML0318A - P5415337

ENGLISH



Installing location where the unit will be exposed to strong wind.

Follow the instructions below to install on the ro­oftop or a location without surrounding buildings,

where strong wind is expected against the product.

Choose a location where the outlet or inlet side of

the product will not be exposed to strong wind.

When the outlet is exposed to strong wind:

Direct strong wind may cause lack of air ow and

adversely affect to the operation.

CAUTION

Excessive strong wind against the outdoor unit
outlet may cause inverse rotation and damage

the fan and motor.

In case of blowing strong wind to air outlet the wind

guard (optional) is available to avoid strong wind

Wind guard model

Model Number of set required

WSP-264 1

NOTE

• The wind guard must be set at annual cooling operation (in DSW2 switch 3).

• For ambient temperature ≤ 10ºC, it is recommended to set the wind guard at cooling operation.



Air ow guide wind guard and snow protection hood

Optional parts Model

Air ow guide AG-264

1 Air ow guide
2 Wind Guard
3 Snow protection hood

Wind guard WSP-264

Snow protection
hood

Zinc Plate

Air outlet ASG-NP80F
Air inlet of rear side ASG-NP56B
Air inlet of side face ASG-NP56L

Stainless plate
(NSSC180)

Air outlet ASG-NP80FS2
Air inlet of rear side ASG-NP63B52

Air inlet of side face ASG-NP63LS2

1

1

2

3

11

4

21

5

1

BA C

1. Fixing screw (accessories)

2. Air inlet hood

3. Wire rope (optional for over turning protection)

4. Air discharge hood

5. Outdoor unit

A. Rear side

B. Left side

C Front side

13

12

PMML0318A - P5415337

Units installation

13.3 INSTALLATION PLACE PROVISION

13

1 Secure the outdoor unit with the anchor

Max 17mm

Concrete

Filled mortar

Anchor bolts

Special
washer

(M12)

Nut

Base of

outdoor unit

Fix the outdoor unit to the anchor bolts by special washer of fac­tory-supplied accessory.

2 When installing the outdoor unit, x the unit by anchor bolts.

Regarding the location of xing holes.

Front side

Pipe cover

M10 Hole for anchor bolt (Ø 12)

3 Example of xing outdoor unit by anchor bolts.

A

Concrete

Anchor bolt

Cut this portion when

this type of anchor

bolt is used. If not, it

is dicult to remove

the service cover

4 Provide an adequate drainage around the foundation. When

installing the unit on a roof or a veranda, drain water may
turn to ice in a cold morning. Therefore, avoid draining in an
area where people often use because it is slippery. In case of
installing such a place, provide the additional drainage around
the foundation.

(30x80)

(30x80)

76

339

147

(228)

4-R8

58

40

42

Drain hole

Drain hole

Position for drain

boss (optional)

Drain hole

Front side

5 The whole of the base of the outdoor unit should be installed

on a foundation. When using vibration-proof mat, it should
also be positioned the same way. When installing the outdoor
unit on a eld supplied frame, use metal plates to adjust the
frame width for stable installation as shown in gure.

INCORRECT

57mm
Base width of
outdoor unit

Outdoor unit

is unstable

60mm
Frame width
(eld supplied)

Frame

CORRECT

Outdoor unit

is stable

57mm
Base width of
outdoor unit

100mm or more
Metal plate

Metal plate

Frame

Recommended metal plate size (eld-supplied)

- Material: Hot-rolled mild steel plate (SPHC)

- Plate thickness: 4.5T

Refrigerant piping & refrigerant charge

13

PMML0318A - P5415337

ENGLISH

14.1.1 Piping materials

1 Prepare locally-supplied copper pipes.
2 Select the piping size with the correct thickness and correct

material which can have sufcient pressure strength.

3 Select clean copper pipes. Make sure there is no dust and

moisture inside. Blow the inside of the pipes with oxygen free
nitrogen to remove any dust and foreign materials before con­necting pipes.

4 After connecting the refrigerant piping, seal the open space

between Knockout hole and refrigerant pipes by using insula­tion material as shown bellow:

Insulation material

Field-supplied

Insulation material

Insulation material

Unit
side

NOTE

• A system with no moisture or oil contamination will give maxi­mum performance and lifecycle compared to that of a poorly
prepared system. Take particular care to ensure all copper
piping is clean and dry internally.

• There is no refrigerant in the cycle of the indoor unit.

CAUTION

• Cap the end of the pipe when pipe is to be inserted through
a hole.

• Do not put pipes on the ground directly without a cap or vinyl
tape at the end of the pipe.

• If piping installation is not completed until next day or over
a longer period of time, braze off the ends of the piping and
charge with oxygen free nitrogen through a Schrader valve
type access tting to prevent moisture and particle contami­nation.



Insulate pipes

After connecting the refrigerant piping, seal the refrigerant pipes
by using the eld-supplied insulation material. Insulate the unions
and are-nuts at the piping connections completely. Insulate the
liquid piping and gas piping completely to avoid decreasing of
performance and dewing on the surface of the pipe.

CAUTION

• Do not use insulation material that contains NH3 because it
can damage cooper pipe material and can be a source of fu­ture leakage.

• Completely insulate both refrigerant gas piping and liquid pi-

ping between the indoor unit(s) and the outdoor unit.

• If not insulated, dew will ocur on the piping surface.

14.1.2 Suspension of refrigerant piping

Suspend the refrigerant piping at certain points and prevent the
refrigerant piping from touching the weak part of the building such
as wall, ceiling, etc…

(If touched, abnormal sound may occur due to the vibration of the
piping. Pay special attention in case of short piping length).

1~15m

Indoor unit

Fire-proof section
treatment

Do not x the refrigerant piping directly with the metal ttings (The
refrigerant piping may expand and contract).

Some examples for suspension method are shown below.

For suspending
heavies

For piping along
the wall

For instant
installation work

14.1.3 Brazing work

CAUTION

• Use nitrogen gas for blowing during pipe brazing. If oxygen,
acetylene or uorocarbon gas is used, it will cause an explo­sion or poisonous gas.

• A lot of oxidation lm will occur inside of tubes if no nitrogen

gas blowing is performed during brazing work. This lm will
be ecked off after operation and will circulate in the cycle,

resulting in clogged expansion valves, etc. This will cause bad

inuence to the compressor.

• Use a reducer valve when nitrogen gas blowing is performed
during brazing. The gas pressure should be maintained within

0.03 to 0.05Mpa. If a excessively high pressure is applied to a
pipe, it will cause an explosion.

14 REFRIGERANT PIPING & REFRIGERANT CHARGE

14.1 REFRIGERANT PIPING WORK

14

14

PMML0318A - P5415337

Refrigerant piping & refrigerant charge

14.2 PIPING CONNECTION FOR OUTDOOR UNIT

1 Take the piping cover away from the unit. Then fetch the pipes

through the rear side and route piping according to the ins­tallation place as shown in the gure. Make holes by cutting
along the guideline at the rear of the cover or punching with
a driver. Remove the burr with a cutter, and place a insulation
(eld supplied) to protect cables and pipes.

Pipe cover

Rear side
piping

Stop valve

Direction to remove pipe cover

Connec

-

ting piping

2 Attach the pipe cover in order to prevent rainwater from ente-

ring inside the cabinet.

3 Use a pipe bender for pipe bending work when connecting

pipes.

4 Check to ensure that the stop valves are completely closed

before connecting pipes.

5 Connect the eld supplied refrigerant pipes to the indoor unit

and outdoor unit. Apply the oil thinly at the seat are nut and
pipe before tightening.

The required tightening torque is as follows:

Pipe Size Tightening Torque (Nm)

Ø 6.35 mm (1/4) 14-18

Ø 9.52 mm (3/8) 34-42
Ø 12.70 mm (1/2) 49-61
Ø 15.88 mm (5/8) 68-82
Ø 19.05 mm (3/4) 100-120

Use two spanners
here for pipe con-

nection

Do not work with

two spanners

here.

Refrigerant

leakage shall

occur

6 After connecting the refrigerant piping, seal the open space

between knockout hole and refrigerant pipes by using insula­tion material.

Unit

Side

Nº Description



Insulation Material



Insulation Material



Field Supplied



Insulation Material

7 Operation of stop valve should be performed according to the

gure below.

8 Close before shipment

14.2.1 Outdoor unit stop valve

Operation of stop valve should be performed according to the
gures and tables below:

Spindle Type

Stop valve (liquid)

Stop valve (gas)

 Spindle valve
 Flare nut
 Cap
 Check joint for service port

Outdoor unit

Tightening Torque (Nm)

   

Gas

valve

Liquid

valve

Gas

valve

Liquid

valve

Gas

valve

Liquid

valve

Gas

valve

Liquid

valve

RAS-(2-2.5)HVNP1 7-9 7-9 34-42 34-42 33-42 33-42 14-18 14-18

RAS-3HVNC1 9-11 7-9 68-82 34-42 33-42 33-42 14-18 14-18

RAS-3HVRNS3 9-11 7-9 68-82 34-42 33-42 33-42 14-18 14-18

Refrigerant
pressure

Closed before shipment

Refrigerant piping

Hexagonal wrench
(eld supplied) (*)

Spindle valve
Tighten the spindle with a torque above:
Counterclockwise…. Open
Clockwise …. Close

Check joint
(Only charging hose can
be connected)
Tighten the cap with 16 N.m torque.

Cap
Tighten the cap with 37 N.m torque
(Attach this after work)

14

Refrigerant piping & refrigerant charge

15

PMML0318A - P5415337

ENGLISH

14.3.2 Piping system for header branch

1 indoor unit system

2 indoor units system

(pictures are as example)



Maximum refrigerant piping length

(m)

Outdoor Unit

IVX ES

2HP 2.5HP 3HP 3HP

Maximum piping
length between the
outdoor unit and the
farthest indoor unit

Actual Length (L)

50

Equivalent Length
(EL)

70

Total piping length 2 units (A+B+C)

50 60

Maximum piping line
after rst branch

2 units (B, C)

10

Main piping length A

A > B, C

Maximum height difference
Outdoor / Indoor (H)
(Outdoor Unit is Higher / Lower.)

30 / 20

Maximum height difference Indoor / Indoor

3 3 0.5

Maximum height difference:
branch pipe/Indoor (2 indoor units system)

3 0.5

(B-C)

< 8

NOTE

• The liquid piping and the gas piping must be of the same
piping length and run along the same route.

• Install the branch piping as much as possible near the indoor
units

• Install Multikits at the same horizontal level.

14

Hexagonal wrench size used for spindle valve:

(*) Size

2HP, 2.5HP 3HP

Gas valve 4 mm 5 mm

Liquid valve 4 mm 4 mm

Do not apply two spanners
at this position. If applied,
leakage will occur.

Stop valve
(Spindle type)

Flare nut

CAUTION

• At the test run, fully open the spindle and ball stop valve.

• If not fully opened, the devices will be damaged.

• Do not attempt to turn service valve rod beyond its stop.

• Do not loosen the stop ring. If the stop ring is loosened, it is
dangerous since the spindle will hop out.

• An excess or a shortage of refrigerant is the main cause of
trouble to the units. Charge the correct refrigerant quantity
according to the description of label at the inside of service
cover.

• Check for refrigerant leakage in detail. If a large refrigerant

leakage occurs, it will cause difculty with breathing or har­mful gases would occur if a re was being used in the room.

14.3 REFRIGERANT PIPING LENGTH

The refrigerant piping between the indoor unit and the outdoor unit should be designed using the beside chart.

Keep the design point within the dark area of the chart, which is showing the applicable height difference according to piping length.

In case that a piping length is shorter than 5 meters, contact the Hitachi dealer.

14.3.1 Piping Length specication

16

PMML0318A - P5415337

Refrigerant piping & refrigerant charge14

14.3.3 Refrigerant piping selection

Select the piping connection sizes according to the following pro­cedures

• Between outdoor unit and branch pipe: Select the same pipe
connection size as the pipe size of the outdoor unit.

• Between branch pipe and indoor unit: Select the same pipe
connection size as the pipe size of the indoor unit.

1 indoor unit system

(mm)

Outdoor Unit HP

Pipe Size (L)

Gas Liquid

2 / 2.5 Ø12.70 Ø6.35

3 Ø15.88 Ø9.52

2 indoor units system

(mm)

Outdoor

Unit HP

Pipe Size (A) Multi-kit

Gas Liquid IVX Series

ES

series

2 / 2.5 Ø12.70 Ø6.35 TE-03N1 -

3 Ø15.88 Ø9.52 TE-03N1

Pipe connection size after branch pipe

(mm)

Indoor Unit capacity

Pipe Size (B, C)

Gas Liquid

≤ 1.5 HP Ø12.70 Ø6.35

1.8 / 2.0 HP Ø15.88 Ø6.35

14.3.4 2 indoor units system installation



Height difference between indoor units and distributor

It is recommended to install all indoor units at the same height.
When the height difference between the indoor units due to buil­ding construction is necessary, this should be less than the value
indicated in the table.

ื

10m (IVX-P)
3m

0.5m

(IVX-C)

(ES)

ืืืื

20m

ื

30m

IU1

IU2

OU1

OU1

ื

3m (ES ืP

ื

3m (ES ืP



Installing Distributor

1 Selecting the distributor

Install the distributor supplied by HITACHI on request the T-joint
can not be installed instead of a branch pipe.

2 Installing the distributor

Fix the branch pipe horizontally to the pillar, wall or ceiling. Piping
must not be xed rigidly to the wall as thermal expansion and
contraction can cause pipe fracture.

Horizontal

To indoor
unit

To outdoor unit

Vertical

To indoor unit

Fixing the branch pipe to
the surface of pillar or wall

Horizontal

Horizontal

Fixing the branch pipe to
ceiling or beam

NOTE

Fix the piping from outside of insulation or inserting absorber bet-

ween the pipe and a xing metal.

3 Correct position of twin distributor

• This is the correct position of twin branch pipe:

Greater

than 0.5 m

Main pipe

Refrigerant
direction

Up

Branch pipe

Main pipe

Refrigerant
direction

Down

• This is wrong position:

Main pipe

Refrigerant direction

Branch pipe

Branch pipe

Refrigerant
direction

Main pipe

Branch pipe

14.3.5 Connecting are adapter

Flare nut (accessories)

Pipe (accessories)

Indoor unit

Flare adapter (accessories)

Gas line

Pipe

(eld

supplield)

Liquid line

The piping sizes for indoor unit and outdoor unit are different.
Attach the are adapter (accessories) at the indoor piping union
part.

Use the adequate are adapter as follows:

Indoor unit

Flare adapter

Gas pipe Liquid pipe

2.0 HP

Big size

(∅15.88→∅12.70)

-

2.5 HP

Big size

(∅15.88→∅12.70)

Small size

(∅9.52→∅6.35)

Refrigerant piping & refrigerant charge

17

PMML0318A - P5415337

ENGLISH

CAUTION

• Do not charge OXYGEN, ACETYLENE, or other ammable
and poisonous gases into the refrigerant because an explo­sion can occur. It is recommended that oxygen free nitrogen
be charged for these types of tests cycle when performing
a leakage test or an airtight test. These types of gases are
extremely dangerous,

• Insulate the unions and are-nuts at the piping connection
part completely.

• Insulate the liquid piping completely to avoid a decrease of
performance; if not, it will cause sweating on the surface of
the pipe.

• Charge refrigerant correctly. Overcharging or insufcient char-
ging could cause a compressor failure.

• Check for refrigerant leakage in detail. If a large refrigerant

leakage occurred, it would cause difculty with breathing or
harmful gases would occur if a re were being used in the

room.

• If the are nut mut is tigthened too hard, the are nut may
crack after a long time and cause refrigerant leakage.



Evacuation and refrigerant charge

Evacuation and refrigerant charging procedure should be perfor­med according to the following instructions.

The stop valve has been closed before shipment. However, make
sure that the stop valves are closed completely.

- Connect the indoor unit and the outdoor unit with eld­supplied refrigerant piping.

- Connect the gauge manifold using charging hoses with a
vacuum pump or a nitrogen cylinder to the check joints of
the liquid line and the gas line stop valve.

- Check for any gas leakage at the are nut connection, by
using nitrogen gas to increase the pressure at 4.15MPa
for outdoor units inside of the eld-supplied piping.

- Operate the vacuum pump for 1 to 2 hours until the pres­sure decreases lower than a pressure of 756 mmHg in
vacuum.

- For charging refrigerant, connect the gauge manifold
using charging hoses with a refrigerant charging cylinder
to the check joint of the liquid line stop valve.

- Charge the proper quantity of refrigerant according to
the piping length (Calculate the quantity of the refrigerant
charge).

- Fully open the gas line stop valve, and slightly open the
liquid line stop valve.

- Charge refrigerant by opening the gauge manifold valve.

- Charge the required refrigerant within the difference range

of ±0.5kg by operating the system in cooling.

- Fully open the liquid line stop valve after completing refri­gerant charge.

- Continue cooling operation for more than 10 minutes to
circulate the refrigerant.

- Remove the “close” plate from the stop valve and hook the
attached “Open” plate at the stop valve.

Gas line

Liquid line

Liquid stop valve

Gas stop valve

Nitrogen tank

(For air tight test & nitrogen blow
during brazing)

Vacuum cylinder

Manifold
gauge

Outdoor unit

Example of Evacuation and Refrigerant Charge for HVN(P/C)1

14

14.4 REFRIGERANT CHARGE

When the pressure is measured, use the check joint of gas stop
valve, and use the check joint of liquid piping in the gure below.

At that time, connect the pressure gauge according to the fo­llowing table because of high pressure side and low pressure side
changes by operation mode.

Cooling

Operation

Heating

Operation

Check Joint for Gas Stop Valve Low Pressure High Pressure

Check Joint for Liquid Stop Valve

Exclussive for Vacuum Pump

and Refrigerant Charge

NOTE

Be careful that refrigerant and oil do not splash to the electrical

parts at removing the charge hoses.

Stop valve (liquid)

Stop valve (gas)

14.5 CAUTION OF THE PRESSURE BY CHECK JOINT

18

PMML0318A - P5415337

Refrigerant piping & refrigerant charge14

14.6 REFRIGERANT CHARGING QUANTITY

In case of the actual piping length is more than the specied length, the additional refrigerant quantity should be charged according
to the table below:

Outdoor unit refri-

gerant charge (kg)

Chargeless length (m)

Additional refrigerant charge (P)

(kg/m)

Max additional

charge (kg)

1 IU 2 IU 1 IU 2 IU

RAS-2HVNP1 1.6 30 0 0.03 0.03 1.5

RAS-2.5HVNP1 1.6 30 0 0.03 0.024 1.2

RAS-3HVNC1 1.9 20 20 0.04 0.04 1.2

RAS-3HVRNS3 1.9 20 20 0.04 0.04 1.2

1 Determine an additional refrigerant quantity according to the following procedure, and charge it into the system.
2 Record the additional refrigerant quantity to facilitate service activities thereafter.

CAUTION

• When charging refrigerant accurately measure refrigerant to be charged.

• Overcharging or undercharging of refrigerant can cause compressor trouble.

• In case of actual piping length less than 5 m, consult your distributor.



Additional refrigerant quantity calculation

Calculate piping length L(m)

Outdoor unit

Indoor unit

L: Piping Length

l: Chargeless length

P: Additional refrigerant charge

(a): No additional charge is required: L≤l

(b): Additional charge is required: L≥l

W (additional charge quantity) = (L-l) x P

Example:

L: 50 m

l: 30 m

P: 0.03

L = 50

Outdoor unit

RAS-2HVNP1

Indoor unit

W (additional charge quantity) = (50-30) x 0.03 = 0.6 kg



Setting of Pipe Length DSW.

DSW2 setting will be required only when the refrigerant pipe
length is shorter than 5 m or longer than 30 m. Pipe length setting
shall be performed as shown below.

(The  side in the table below shows the DSW location)

DSW2 on Outdoor PCB1

Factory setting Pipe Length ≤ 5m Pipe Length ≥ 30m

Drain piping

19

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ENGLISH

14.7 REFRIGERANT PUMP DOWN

When the refrigerant should be collected into the outdoor unit due
to indoor/outdoor unit relocation, collect the refrigerant as follows:

1 Attach the manifold gauge to the gas stop valve and the liquid

stop valve

2 Turn ON the power source
3 Set the DSW1-1 pin of the outdoor unit PCB at the “ON” side

for cooling operation. Close the liquid stop valve and collect
the refrigerant.

4 When the pressure at lower pressure side (gas stop valve)

indicates -0.01 MPa (-100 mmHg), perform the following pro­cedures immediately.

- Close the gas stop valve.

- Set the DSW1-1 pin at the “OFF” side (To stop the unit

operation).

5 Turn OFF the power source.

CAUTION

Measure the low pressure by the pressure gauge and keep it not

to decrease than -0.01 MPa. If the pressure is lower than -0.01

MPa, the compressor may be faulty.

15 DRAIN PIPING

15.1 DRAIN DISCHARGING BOSS

15

When the base of the outdoor unit is temporarily utilized as a dra­in receiver and the drain water in it is discharged, this drain boss
is utilized to connect the drain piping.

Model Applicable Model

DBS-12L

RAS-(2/2.5)HVNP1

RAS-3HVNC1

RAS-3HVRNS3



Connecting procedure

1 Insert the plastic cap into the drain boss up to the extruded

portions.

2 Insert the boss into the unit base up to the extruded portions.
3 Size of the drain boss is 15 mm (O.D.)
4 A drain pipe should be eld-supplied.

NOTE

• Do not use this drain boss set in a cold area, because the
drain water may freeze.

• This drain boss is not sufcient to collect all the drain water. If
collecting drain water is completely required, provide a drain­pan that is bigger than the unit base and install it under the
unit with drainage.

Drain pipe

Plastic cap

Plastic cap

Drain hole

100 mm

Plastic cap

Drain hole

Push Push

≥ O.D. ∅ 16 mm

Speciers/installers have responsibility to follow local codes and
regulation which specify safety requirements against refrigerant
leakage.

14.8.1 Maximum permissible concentration of HCFC/
HFC gas

The refrigerant R410A, charged in the system, is an incombusti­ble and non-toxic gas. However, if leakage occurs and gas lls a
room, it may cause suffocation.

The maximum permissible concentration of HCFC/HFC gas,
R410A in air is 0.44 kg/m³, according to EN378-1.

Therefore, some effective measure must be taken to lower the
R410A concentration in air below 0.44 kg/m³, in case of leakage.

14.8.2 Calculation of refrigerant concentration

1 Calculate the total quantity of refrigerant R (kg) charged in

the system connecting all the indoor units of rooms to be air­conditioned.

2 Calculate the room Volume V (m³) of each room.
3 Calculate the refrigerant concentration C (kg/m³) of the room

according to the following equation:

R R: Total quantity of charged refrigerant (kg)

≤ C V: Room volume (m³)

V C: Refrigerant concentration 0.44 kg/m³ for R410A

14.8.3 Countermeasure for refrigerant leakage

1 Provide a shutterless opening which allow fresh air to circula-

te into the room.

2 Provide a doorless opening of 0.15% or more size to the oor

area.

3 Pay a special attention to the place, such as a basement, etc.,

where refrigerant can stay, since refrigerant is heavier than
air.

14.8 CAUTION ON REFRIGERANT LEAKAGE

20

PMML0318A - P5415337

Electrical wiring

16 ELECTRICAL WIRING

16.1 GENERAL CHECK

1 Ensure that the eld-supplied electrical components (mains

power switches, circuit breakers, wires, connectors and wire
terminals) have been properly selected according to the elec­trical data indicated. Make sure that they comply with national
and regional electrical codes.

2 Following the Council Directive 2004/108/EC(89/336/EEC),

relating to electromagnetic compatibility, next table indicates:
Maximum permissible system impedance Z

max

at the interface

point of the user’s supply, in accordance with EN61000-3-11

MODEL

Z max

(Ω)

MODEL

Z max

(Ω)

RAS-2HVNP1 - RAS-3HVNC1 -

RAS-2.5HVNP1 - RAS-3HVRNS3 -

3 Harmonics situation of each model regarding IEC 61000-3-2

and IEC 61000-3-12 is as follows:

MODELS SITUATION REGARDING
IEC 61000-3-2 AND IEC 61000-3-12

Ssc “xx”

MODELS

Equipment complying with IEC 61000-3-2

(professional use)

RAS-2HVNP1

RAS-2.5HVNP1

RAS-3HVNC1

RAS-3HVRNS3

4 Check to ensure that the power supply voltage is within +/-

10% of the rated voltage.

5 Check to ensure that power supply has an impedance low

enough to warranty not reduce the starting voltage more than
85% of the rated voltage.

6 Check to ensure that the ground wire is connected.
7 Connect a fuse of specied capacity.

NOTE

Check and test to ensure that if there is more than one source of
power supply, that all are turned OFF.

CAUTION

• Check to ensure that screws for terminal block are tightly
tightened.

• Check to ensure that the indoor fan and the outdoor fan have
stopped before electrical wiring work or periodical check is
performed.

• Protect the wires, drain pipe, electrical parts, from rats or
other small animals. If not protected, rats may damage unpro-

tected parts, and at the worst, a re will occur.

• Wrap the accessory packing around the wires, and plug the
wiring connection hole with the seal material to protect the
product from any condensed water and insects.

• Tightly secure the wires with the cord clamp inside the indoor
unit.

• Lead the wires through the knockout hole in the side cover
when using conduit.

• Secure the cable of the remote control switch with the cord
clamp inside the electrical box.

• Electrical wiring must comply with national and local codes.
Contact your local authority in regards to standards, rules, re­gulations, etc.

• Check that the ground wire is securely connected.

• Connect a fuse of specied capacity.

DANGER

• Do not connect of adjust any wiring or connections un-

less the main power switch is OFF.

• Check that the earth wire is securely connected, tagged
and locked in accordance with national and local codes.

16

16.2 ELECTRICAL WIRING CONNECTION FOR OUTDOOR UNITS

The electrical wiring connection for the outdoor unit is shown in
gure below:

L1

L2

N

1 2

   

Power Supply AC 230 V

Control cable (5V)

Instructions for wiring and electrical board:

Power wires

PCB

Earth terminal

Side cover

Transmission
wires

Electrical wiring

21

PMML0318A - P5415337

ENGLISH

16.2.1 Setting of DIP switches for outdoor unit



Quantity and Position of DIP Switches

The PCB in the outdoor unit is operating with 7 types of DIP swit­ches, and 4 push switch. The location is as follows:



DSW301: Test run mode

Setting before shipment

1 2 3 4 5 6

ON

Cooling

Heating

Forced stop of compressor



DSW1: No setting is required

When set pin number 1 to ON, the electric
current detection is cancelled. Pin number
1 should be set back to OFF after electrical
work



DSW2: Optional function setting and piping lenght

Factory setting

Piping length ≤ 5m

Piping lenght ≥ 30m

Optional function setting

Optional function setting

1 2 3 4 5 6

ON

External input/output setting mode



DSW3: Capacity Setting (No setting is required)

Model RAS-2HVNP1

Setting position

Model RAS-2.5HVNP1

Setting position

Model

RAS-3HVNC1

RAS-3HVRNS3

Setting position



DSW4 / RSW1: Refrigerant cycle number setting

(Setting is required)

Setting for the ten digit

Setting position.

Set by inserting slotted screwdriver into the
groove (setting for the last digit)



DSW5: End terminal resistance (No setting is required)

Setting before shipment



DSW6: Setting of multiple indoor units simultaneous

operation (setting is required) (IVX series only)

Optional function setting

For individual operation (factory

setting position) for IVX series

For simultaneous operation

Set pin number 1 at OFF for simulta-

neous operation



DSW6: Not available for ES series

Factory setting

Empty

or

16

22

PMML0318A - P5415337

Electrical wiring

16.3 COMMON WIRING

16.3.1 Electrical wiring between indoor unit and
outdoor unit

• Connect the electrical wires between the indoor unit and the
outdoor unit, as shown below.

• If the refrigerant piping and the control wiring are connected to
the units in the same refrigerant cycle.

• Use twist pair wire (more than 0.75 mm²) for operation wiring
between outdoor unit and indoor unit, and operation wiring
between indoor unit and indoor unit.

• Use 2-core wire for the operating line (Do not use wire with
more than 3 cores).Use shielded wires for intermediate wiring
to protect the units from noise obstacle at length of less than
300 m and size complied with local code.

• Open a hole near the connection hole of power source wiring
when multiple outdoor units are connected from one power
source line.

• The recommended breaker sizes are detailed in the Wire size
section.

• In the case that a conduit tube for eld-wiring is not used, x
rubber bushes with adhesive on the panel.

• H-LINK twist pair shielded cable must be grounded in the
outdoor unit side.

CAUTION

Pay attention to the connection of the operating line. Incorrect

connection may cause the failure of PCB.
All the eld wiring and electrical components must comply with

local codes.

16

Power source from the outdoor IVX unit to the indoor unit

(example)

Independent power source of outdoor IVX unit and indoor unit

(example)

No. 0 System
Outdoor unit

No. 0 System
Outdoor unit

Operating Line
(Shielded Pair Cable)

DC5V (Non-Pole Transmission,
H-LINK System)

Remote Control Switch
(Twisted Shielded Pair
Cable)

Operating Line
(Twisted Shielded
Pair Cable)

DC5V (Non-Pole
Transmission, H-LINK
System)

Indoor Unit

Indoor Unit

Terminal board
Circuit Breaker
Earthleakage Breaker
Field Wiring
Field supplied
Optional Accessory

Remote Control Switch
(Twisted Shielded Pair
Cable)

Indoor Unit

Indoor Unit

12

ON

DSW6

12

ON

DSW6

12

ON

DSW6

Operating line

Operating line Operating line

Remote control
line

Remote control
line

Remote control
line

Individual control
Running ON/OFF individually
Thermo.ON/OFF individually

Individual control
Running ON/OFF simultaneously
Thermo.ON/OFF individually

Simultaneous control
Running ON/OFF simultaneously
Thermo.ON/OFF simultaneously

(IVX series only)

Electrical wiring

23

PMML0318A - P5415337

ENGLISH

16.3.2 Wire size



Connection wiring

Recommended minimum sizes for eld provided wires:

Model Power supply

Power source cable size Transmitting cable size

EN60 335-1 EN60 335-1

All Indoor Units 1~ 230V 50Hz 0.75 mm²

0.75 mm²

RAS-2HVNP1 1~ 230V 50Hz 2.5 mm

2

RAS-2.5HVNP1 1~ 230V 50Hz 4.0 mm

2

RAS-3HVNC1 1~ 230V 50Hz 4.0 mm

2

RAS-3HVRNS3 1~ 230V 50Hz 4.0 mm

2

NOTE

• Follow local codes and regulations when selecting eld wires, Circuit breakers and Earth Leakage breakers

• Use the wires which are not lighter than the ordinary polychloroprene sheathed exible cord (code designation H05RN-F)



Main switch protection

Select the main switches according to the next table:

Model Power supply Max. current (A) CB (A) ELB (no.poles/A/mA)

All Indoor Units 1~ 230V 50Hz 5.0 6 2/40/30

ELB: Earth switch; CB: Circuit braker



IVX Premium and Standard series, and ES series

Outdoor unit Power supply MC (A) CB (A) ELB

RAS-2HVNP1 1~ 230V 50Hz 13.8 16

2/40/30

RAS-2.5HVNP1 1~ 230V 50Hz 15.8 20

RAS-3HVNC1 1~ 230V 50Hz 17.8 20

RAS-3HVRNS3 1~ 230V 50Hz 17.8 20

16

24

PMML0318A - P5415337

Electrical wiring

16.3.3 H-LINK system

The H-LINK system can not be applied to the cycle with the old
model unit or the unit with old transmission

1 Application

The new H-LINK wiring system requires only two transmission
wires connecting each indoor unit and outdoor unit for up to 16
refrigerant cycles, and connecting wires for all indoor units and all
outdoor units in series.

2 Features

- The total wiring length is remarkably reduced.

- Only one connection is required for the wiring between the

indoor unit and outdoor unit.

- Easy wiring connection to the central controllers.

3 Specications

- Transmission Wire: 2-Wire

- Polarity of transmission wire: Non-polar wire

- Maximum outdoor units to be connected: 16 units per

H-LINK system.

- Maximum indoor units to be connected: 3 units per cycle
and 48 units per H-LINK system

- Maximum wiring length: Total 1000m (including CSNET
WEB). In case that the total wiring length is longer than
1000m, contact the Hitachi dealer.

- Recommended cable: Twist pair cable with shield, over

0.75mm2 (Equivalent to KPEV-S)

- Voltage: DC5V

4 Example of H-LINK system

Using H-Link system only for air conditioners.

There are two typical cases of using H-LINK system:

a. Using H-LINK system only for air conditioners, without

control device.

Examples:

• Line connection with all units

Do not make

wiring in a

loop

Indoor

units

Outdoor

units

• Line connection for each oor

Indoor

units

Outdoor

units

b. Using H-LINK system for air conditioners with central con-

trol device.

In case that H-LINK is not applied when electrical wiring is per­formed.

Indoor units

Outdoor

units

NOTE

• Do not make a wiring in a loop.

• In the case that H-LINK is not applied after the when electri­cal wiring is performed as shown above, H-LINK is applied
after the instrument wiring is completed. Therefore, the dip
switches are required to be set according to setting of Dip

switches on PCB.

5 Dip Switch Setting of Indoor PCB and Outdoor PCB

It is required to set dip switches of every indoor unit and outdoor
unit.

16

Electrical wiring

25

PMML0318A - P5415337

ENGLISH

16.3.4 DIP switch setting for multiple H-LINK system

The DIP switches of all the outdoor and indoor units have to be set as follows:

Unit Name of DIP switch Mark

Setting before the

shipment

Function

Outdoor unit

Terminal resistance DSW5

DSW5-1 is “ON” position before shipment.

• It is not necessary to set when H-LINK is connected with

only one outdoor unit.

• When H-LINK is connected with more than one outdoor unit,

set as follows:

- First outdoor unit: Keep DSW5-1 in “ON”.

- Other outdoor units: Set DSW5-1 to “OFF”.

Refrigerant cycle

DSW4
RSW1

For setting the refrigerant cycle address of the outdoor unit. Set
the DSW4 and RSW1 to overlap the setting of other outdoor
units in the same H-LINK system.

Indoor unit

Refrigerant cycle

DSW5
RSW2

DSW5

RSW2

For setting the refrigerant cycle address of the indoor unit. Set
the DSW5 and RSW2 corresponding to the address of outdoor
unit in the same refrigerant cycle.

Address of the

indoor unit

DSW6
RSW1

DSW6

RSW1

Setting indoor unit address. Set the DSW6 and RSW1 not to
overlap the setting of other indoor units in the same refrigerant
cycle. (If no set, the automatic address function is performed.)

16

Example of the setting of the DIP switches.

(00) (01)

(02)

(00) (00) (00) (00) (01) (01)

(02)

(02) (02)

(00) (01) (02) (03) (00) (01)

(00)

(01) (02)

Indoor
units

Outdoor
units

Cycle number 0

Cycle number 1

Cycle number 2

DSW5

Terminal resistance

DSW4

Number of refrigerant cycle.
(setting for tenth digit

)

RSW1

Number of refrigerant cycle
(setting for last digit)

DSW6

Address of the indoor unit
(setting for the tenth digit)

.

DSW5

Number of refrigerant cycle.
(setting for tenth digit)

RSW2

Number of refrigerant cycle
(setting for last digit)

RSW1

Address of the indoor unit
(setting for the last digit)

26

PMML0318A - P5415337

Installation of remote controller17

17 INSTALLATION OF REMOTE CONTROLLER

17.1 INSTALLATION OF REMOTE CONTROL SWITCH (PC-ART EXAMPLE)

PC-ART

All data related to Installation about Remote Control Switch are in the specic Installation Manual.
Please refer to Installation Manual PMML0177A for PC-ART and PMML0225A for PC-ARF.

18 TEST RUNNING

When installation is completed, perform test run according to the
following procedure, and hand over the system to the customer.
Perform test run regarding indoor units one by one in order, and
conrm that the electrical wiring and the refrigerant piping are
correctly connected.

Test run should be performed according to the Test run procedure
on next page.

CAUTION

Do not operate the system until all the check points have been
cleared:

• Check to ensure that the electrical resistance is more than

1 MΩ, by measuring the resistance between ground and the

terminal of the electrical parts. If not, do not operate the sys­tem until the electrical leakage is found and repaired. Do not

impress the voltage on the terminals for transmission 1 and 2.

• Check to ensure that the stop valves of the outdoor unit are
fully opened, and then start the system.

• Check to ensure that the switch on the main power source has

been ON for more than 12 hours, to warm the compressor oil

by the oil heater.

• Pay attention to the following items while the system is run­ning:

• Do not touch any of the parts by hand at the discharge gas
side, since the compressor chamber and the pipes at the dis­charge side are heated higher than 90°C.

• DO NOT PUSH THE BUTTON OF THE MAGNETIC

SWITCH(ES), it will cause a serious accident.

• Do not touch any electrical components for more than three
minutes after turning OFF the main switch

• Conrm that the gas line stop valve and the liquid line stop
valve are fully open.

• Conrm that the leakage of the refrigerant does not exist. The
are nuts are sometimes loosened by vibration during trans­portation.

• Check that the refrigerant piping and the electrical wiring con­form to the same system.

• Conrm that the dip switch setting on the printed circuit board
of the indoor units and the outdoor units are correct.

• Check whether or not the electrical wiring of the indoor units
and the outdoor units are connected as shown in the chapter

Electrical wiring.

CAUTION

Conrm that eld-supplied electrical components (main switch

fuse, fuse-free breaker, earthleakage breakers, wires, conduit
connectors and wire terminals) have been properly selected ac­cording to the electrical data given in the Technical Catalog of the
unit and ensure that the components comply with national and
local codes.

NOTE

• For more reference check Troubleshooting chapter on Ope-
ration part.

• For 2 indoor units system check the indoor unit outlet air
temperature at test run. If the temperature difference is large

(aprox. 10 deg. or more (cooling) 20 deg. or more (heating)

recheck the refrigerant piping, Installation may have some
problem.

• In the case of anual cooling optional function, cut JP1 out and

set the DSW6-1 to OFF. (Individual control is not available
when anual cooling is selected), (IVX series only).

Test running

27

PMML0318A - P5415337

ENGLISH

18

18.1 TEST RUN PROCEDURE BY REMOTE CONTROL SWITCH (PC-ART EXAMPLE)



Turn ON the power source of the units



Counting
number of
connected
units



Operation lamp



Procedure for TEST RUN mode of remote control switch.

Depress the MODE and the OK switches together for more than 3 se­conds.

a. If TEST RUN and the counting number of the connected units to

the remote control switch (for example ) are indicated on the
remote control switch, the connection of remote control cable is

correct. → Go to 

b. If no indication appears or the number of the units indicated is

smaller than the actual number of the units, some abnormalities
exist. → Go to 



Remote control

switch indication

Wrong portions Inspection points after the power source OFF

No indication

The power source of outdoor unit is not turned ON.

The connection of the remote control cable is
incorrect.

1 Connecting points of remote control cable, terminal board of re-

mote control switch and indoor unit.

2 Contact of terminals of remote control cable.

The connecting wires of power supply line are
incorrect or loosened.

3 Connection order of each terminal board.
4 Screw fastening of each terminal boards.

Counting number
of connected units
is incorrect

The power source of outdoor unit is not turned ON.

The operating line wiring between indoor unit and
outdoor unit is not connected.

The connection of control cables between each
indoor units are incorrect. (When one remote con­trol switch controls multiple units).

5 Dip switch setting on printed circuit board.
6 Connection on the PCB.

7 This is the same as item  1, 2, and 3.

Back to  after checking



Select TEST RUNNING MODE by depressing MODE Switch (COOL OR HEAT)



Depress RUN/STOP switch.

The TEST RUN operation will be started. (The 2 hours OFF-TIMER will be set and the TEST RUN operation will be nished after 2 hours unit
operation or by depressing the RUN/STOP switch again).

NOTE

TEST RUN operation ignores the temperature limitation and ambient temperature during heating operation to have a continuous operation, but
the protections are alive. Therefore, the protection may activate when the heating TEST RUN operation is performed in high ambient tempera­ture.

TEST RUN operation time can be modifyed / increased depressing the time switch in the Remote Control.

If the unit do not start or the operation lamp on the remote control switch is ickered, some abnormalities exist. →Go to 

28

PMML0318A - P5415337

Test running18



Remote control switch

indication

Unit condition Wrong portions

Inspection points after power source

OFF

The operation lamp
ickers. (1 time/1 sec.)
and the unit number and
alarm code 03 icker.

The unit does not start.

The power source of
outdoor unit in not turned

ON.

The connecting wires of
operating line are inco­rrect or loosened.

1 Connecting order of each terminal

boards.

2 Screw fastening of each terminal

boards.

NOTE

Recovering method of FUSE for opera-

ting circuit. There is a fuse (FUSE4 on
indoor unit PCB1, EF1 on outdoor unit
PCB1) to protect operating circuit on the
PCB, when the power lines are connec-

ted to operating lines. If fuse is melted,
operating circuit can be recovered once

by setting the dip switch on the PCB as

shown in 

The operation lamp ic­kers. (1 time/2 sec.)

The unit does not start.

Remote control cable is
broken.

Contact of connectors is
not good.

The connection of remote
control cable is incorrect

This is the same as item  1 and 2

Indication of icker ex­cept above

The unit does not start, or start once and
then stops

The connection of
thermistor or other con­nectors are incorrect.
Tripping of protector
exists, or else.

Check by the abnormality mode table in
the Technical Catalogue (Do it by servi­ce people).

The operation lamp
ickers. (1 Time/1s)

Unit number , alarm
code  and unit code

 icker

The unit does not start.

The connection of the
remote control cable
between indoor units is
incorrect.

Check by the abnormality mode table in
the Technical Catalog (Do it by service
people).

Back to  after checking



Instructions for the recovery when the fuse of the transmission circuit is blown out:

1 Correct the wiring to the terminal board.
2 Set pin 2 of DSW7 on the indoor units PCB to ON

18.2 TEST RUN PROCEDURE FROM OUTDOOR UNIT SIDE

The procedure of test run from outdoor unit side is indicated below. Setting of this DIP switch is available with the power source ON.

Setting of Dip switch

DSW301

Switch for setting of service operation and function

Factory

setting

1 Test Run
2 COOL/HEAT

(Setting ON: Heat Operation)

3 OFF (Fixed)
4 Manual Compressor stop
5 OFF (Fixed)
6 OFF (Fixed)

CAUTION

• Do not touch any other electrical parts when operating swit-

ches on the PCB.

• Do not attach or detach service cover when the power source
for the outdoor unit is ON and the outdoor unit is operated.

• Turn all DIP switches of DSW301 OFF when the test run ope-
ration is completed.

Test running

29

PMML0318A - P5415337

ENGLISH

18

Dip switch setting Operation Remarks

Test run

 Setting of operation mode.

Cooling: Set DSW301 pin 1-2 OFF.

Heating: Set DSW301 pin 2 ON.

 Starting test run. Set DSW301 pin 1
ON and the operation is started after a
few ~20 seconds.

Cooling Heating

 The indoor unit automatically start to
operate when the test run of the outdo-

or unit is set.

 The ON/OFF operation can be per­formed from the remote control switch

or DSW301-1 of the outdoor unit.

 Continuous operation during 2 hours

is performed without Thermo-OFF.

NOTE

TEST RUN operation time can be in-

creased depressing the time switch

in the Remote Control.

If is setting DSW1-3 ON, cooling/

heating intermediate season mode is

activaded.

Take care that the indoor units start opera­tion in accord with the test run operation of

the outdoor unit.

If the test run is started from the outdoor

unit, cannot be cancelled by the remote

control.

In case that the plural indoor units are

connected with one remote control switch,

all the units start test run operation at the

same time, therefore, turn the power sour-

ce OFF for the indoor units not to operate

test run. In this case, the TEST RUN in-

dication of the remote control switch may

icker, and this is not abnormal.

The setting of DSW1 is not required for the

test run from the remote control switch.

Manual OFF of
compressor

 Setting

- Compressor Manual OFF:

Set DSW301 pin 4 ON.

- Compressor ON:

Set DSW301 all pins OFF.

 When DSW301-4 is ON during com­pressor operation, the compressor stops
to operate immediately and the indoor
unit is under the condition of Thermo­OFF.

 When DSW1-4 is OFF, the compres­sor starts to operate after the cancella­tion of 3-minutes guard.

• Do not repeat compressor ON/OFF fre-

quently.

Manual defrost

 Manual defrost operation starts. Press
PSW1 for more than 3 seconds during
heating operation, the defrost operation
is started after 2 minutes. This function is
not available within 5 minutes after star­ting heating operation.

 Manual defrost operation nishes.
Defrost operation is automatically ended
and the heating operation is started.

 Defrost operation is available regar­dless of frosting condition and total time
of heating operation.

 Defrost operation in not performed
when the temperature of outdoor heat
exchanger is higher than 10°C, high
pressure is higher than 3.3MPa (33kgf/

cm2G) or Thermo-OFF.

• Do not repeat defrost operation fre-

quently.

30

PMML0318A - P5415337

Safety summary & control device setting19

19 SAFETY SUMMARY & CONTROL DEVICE SETTING



Compressor Protection

High pressure switch:

This switch cuts out the operation of the compressor when the
discharge pressure exceeds the setting.



Fan Motor Protection

When the fan motor current is reached to the setting, motor output
is decreased.

The other way, when the fan motor current becomes lower, limi­tation is cancelled.

For compressor

Pressure switches

High

Cut-Out

Cut-In

MPa

Automatic reset, non-adjustable
(each one for each compressor)

-0.05

4.15

-0.15

MPa 3.20 ± 0.15

For control

Fuse

1φ, 230V, 50Hz

A 25

CCP timer

Setting time min.

Non-Adjustable

3

For condenser fan motor

Internal thermostat

Cut-Out

Automatic reset, non-adjustable

(each one for each motor)

ºC

-

For control circuit

Fuse capacity on PCB

A 3

20 TROUBLESHOOTING

Alarm code indication of remote control switch:

Abnormal
indoor unit
number

Abnormal
refrigerant cycle
number Alarm code Model code

Connected
number of
indoor units Alarm code

Model Code

Indication Model



Heat-pump

Indicated for

a second

alternately



Inverter



Multi



Cooling only



Others



IVX, individual operation

L

KPI

Troubleshooting

31

PMML0318A - P5415337

ENGLISH

20

Code

number

Category Content of abnormality Leading cause

01 Indoor unit Tripping of protection device

Failure of fan motor, drain discharge, PCB, relay, oat switch activa­ted

02 Outdoor unit Tripping of protection device Activation of PSH, locked motor

03

Transmission

Abnormality between indoor (or outdoor) and
outdoor (or indoor)

Incorrect wiring, failure of PCB, tripping of fuse, power supply OFF

04 Abnormality between inverter and control PCB Failure in transmission between PCBs for inverter

06 Voltage drop

Voltage drop by excessively low or high voltage
to outdoor unit

Voltage drop of power supply. Incorrect wiring or insufcient capacity
of power supply wiring

07

Cycle

Decrease in discharge gas superheat Excessive refrigerant charge, expansion valve open lock

08 Increase in discharge gas temperature

Insufcient refrigerant, refrigerant leakage, clogging or expansion
valve close lock

11

Sensor on

indoor unit

Inlet air thermistor

Failure of thermistor, sensor, connection

12 Outlet air thermistor

13 Freeze protection thermistor

14 Gas piping thermistor

19 Tripping of protection device for fan motor Failure of fan motor

20

Sensor on

outdoor unit

Compressor thermistor

Failure of thermistor, sensor, connection22 Outdoor air thermistor

24 Evaporating thermistor

31 Incorrect setting of outdoor and indoor unit Incorrect setting of capacity code

35 Incorrect setting in indoor unit number Duplication of indoor unit number

38 Abnormality of protective circuit in outdoor unit

Failure of indoor unit PCB. Incorrect wiring connection to PCB in
indoor unit.

41

Pressure

Overload cooling
(Possibility of high pressure device activation)

Outdoor unit pipe thermistor temperature is higher than 55ºC and the
compressor top temperature is higher than 95ºC when outdoor unit
protection device is activated

42

Overload heating
(Possibility of high pressure device activation)

Indoor unit freeze protection thermistor temperature is higher than
55ºC and the compressor top temperature is higher than 95ºC when
outdoor unit protection device is activated

47

Activation of low pressure decrease protection
device

Stoppage by excessively decrease of evaporating temperature
(Te < -35ºC) is activated 3 times in one hour, locked motor in heating
operation

48 Protection activation for overload operation Excessive refrigerant. Pipe clogging. Compressor failure

51

Inverter

Abnormality of current sensor for inverter Failure of control PCB

53 Protection activation of transistor module

Inverter PCB abnormality.
Failure of compressor, clogging of heat exchanger

54 Inverter n temperature increase

Abnormal inverter n thermistor.
Clogging of heat exchanger
Abnormal outdoor fan

55 Inverter abnormality Failure of inverter PCB

57 Outdoor fan Fan motor abnormality

Disconnected wire of incorrect wiring between control PCB and
inverter PCB.
Incorrect wiring or fan motor abnormality

b1

Indoor unit

number setting

Incorrect unit number setting Over 64 indoor units setting by number or indoor unit address

EE Compressor Compressor protection alarm Failure of compressor.

Printed in Japan

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