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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. 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...
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Originální verze tohoto dokumentu je v angličtině; ostatní jazykové varianty jsou z angličtiny přeložené. Pokud mezi anglickou a jakoukoli jinou jazykovou verzí dojde k rozporu, bude převažovat anglická verze. Originaalversioon on ingliskeelne; teised keeled on tõlge inglise keelest. Vastuolude korral ingliskeelse ja tõlkeversioonide vahel kehtib eesõiguslikult ingliskeelne versioon.
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English Original version Español Versión traducida Deutsch Übersetzte Version Français Version traduite Italiano Versione tradotta Português Versão traduzidal Dansk Oversat version Nederlands Vertaalde versie Svenska Översatt version Ελληνικα Μεταφρασμένη έκδοση Български Преведена версия Čeština Přeložená verze Eesti Tõlgitud versioon Magyar Lefordított változat Latviešu Tulkotā...
Contents General information .....................1 Name of parts and dimensional data ..............6 Refrigerant cycle ....................8 Additional considerations for the unit installation ..........11 Refrigerant piping and refrigerant charge ............13 Refrigerant piping length ..................27 DIP switches ......................32 Commissioning ....................37 Vacuum pumping ....................39 Charging work .....................43 Refrigerant pump down ..................47 H-LINK II system ....................49 Test run from outdoor unit side .................53...
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General Index 1. General information ....................1 1.1 General information ..................2 1.2 Applied symbols....................2 1.3 Additional information about safety ..............3 1.4 Important notice ....................4 1.5 Product guide ....................5 1.5.1 Classification of the outdoor unit ............5 1.5.2 Outdoor units product line-up ..............5 2. Name of parts and dimensional data .................6 2.1 RAS-(2-3)HVRC3 ....................7 3. Refrigerant cycle...
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5.4.2 Cutting copper refrigeration pipes ............19 5.4.3 Bending copper pipes ................19 5.4.4 Brazing copper refrigerant pipes ............20 5.5 Refrigerant pipe insulation ................21 5.6 Suspension of Refrigerant Piping ..............22 5.7 Line branch and header branch installation ...........22 5.8 Piping connection for outdoor unit ..............23 5.8.1 Outdoor unit stop valve .................25 5.8.2 Connecting flare adapter ...............26 6. Refrigerant piping length...
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11. Refrigerant pump down ..................47 11.1 General considerations ..................48 11.2 RAS-(2-3)HVRC3 refrigerant pump down example .........48 12. H-LINK II system ......................49 12.1 General considerations ..................50 12.2 System installation DSW Setting ..............51 13. Test run from outdoor unit side ................53 13.1 RAS-(2-3)HVRC3 test run procedure ...............54 13.2 Test run check list ....................56 14. Troubleshooting ......................57...
General information 1.1 General information ..................2 1.2 Applied symbols....................2 1.3 Additional information about safety ..............3 1.4 Important notice ....................4 1.5 Product guide ....................5 1.5.1 Classification of the outdoor unit ............5 1.5.2 Outdoor units product line-up ..............5 PMEN0654 rev.0 - 12/2023...
CAUTION • The text following this symbol contains information and instructions relating directly to your safety, in addition to hazards or unsafe practices which could result in minor personal injuries or product or property damage. • Not taking these instructions into account could lead to minor injuries to you and others. •...
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 specifications without notice.
1.5 Product guide 1.5.1 Classification of the outdoor unit Unit type (Outdoor unit): RAS Position-separating hyphen (fixed) Capacity (HP): 2, 2.5, 3 H: Heat pump V: Single phase unit (~ 230V 50Hz) R: R32 refrigerant C: Simultaneous operation or monosplit system 3: series –...
2.1 RAS-(2-3)HVRC3 For more information check the technical catalogue. Dimension Model RAS-(2/2.5)HVRC3 22.5 12.7 6.35 RAS-3HVRC3 26.5 127.5 15.88 9.52 Punched drain hole: 30x80 long hole Attachment hole for M10 anchor bolt: 2-U cut hole Air suction inlet Punched drain hole: For drain pipe Attachment hole for M10 anchor bolt: 2-Long hole Foot part Air discharge outlet...
3.1 General notes Refrigerant Heating Cooling Field supplied Flare nut Brazed refrigerant flow refrigerant flow piping line connection connection 3.2 RAS-(2/2.5)HVRC3 N° Part name Compressor Air side heat exchanger Accumulator Refrigerant strainer Distributor E Ø6.35 Silencer 4-way valve E Ø6.35 F Ø6.35 Outdoor unit electronic D Ø6.35...
3.3 RAS-3HVRC3 N° Part name Compressor Air side heat exchanger Accumulator Refrigerant strainer Distributor F Ø6.35 Silencer 4-way valve G Ø6.35 H Ø4.76 D Ø9.52 E Ø8.0 Outdoor unit electronic C Ø12.7 expansion valve Refrigerant check joint D Ø9.52 B Ø12.7 A Ø15.88 B Ø12.7 10 Stop valve for gas line...
4.1 Installations with exposure to strong winds 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 flow and adversely affect to the operation.
5.1 Selection of the copper pipes The copper pipe used for the installation must be specific for refrigeration systems. CAUTION • The copper pipe used in the refrigeration installations is different to the copper pipe used in installations carrying domestic or heating water. •...
Therefore, all work carried out on the copper pipes for refrigerant must follow the three principles described below: Principle Cause of the fault Possible fault Preventive measure Ice on the inside of the pipe, on the expansion valve (water Seal the ends of the pipes. Water infiltration due to obstruction) Protect and insulate the ends of...
Before tightening the flare nut, apply the refrigerant oil (field-supplied) of the same type and brand that the compressor installed in the outdoor unit is using in thin layer over the flaring part. Do not apply the oil on other portions. Tighten the flare nut for the liquid pipe to the specified torque with two spanners.
CAUTION • Secure the fixed connection with a suitable wrench and use a torque wrench to tighten the flare nut on the threaded connections. • Do not exceed the torque value indicated in the table. The fitting can become misshapen and the connection may leak.
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• Use nitrogen gas for blowing during pipe brazing work. Otherwise a lot of oxidation film will occur inside of tubes. This film will be flecked off after operation and will circulate in the cycle, resulting in clogged expansion valves, bad influence to the compressor, etc. •...
5.4.2 Cutting copper refrigeration pipes Use a pipe cutter and define the necessary length of pipe and add a few more centimetres to give yourself enough margin in case the cut has to be repeated. Remove any internal burrs arising from the pipe cutter using a pipe reamer.
5.4.4 Brazing copper refrigerant pipes Brazing is the most important job in the installation of refrigeration pipes. In the event of an accidental leak due to negligence during the brazing process, the capillary tubes, expansion valves, etc., will be obstructed or the compressor seriously damaged. To guarantee correct brazing between pipe surfaces, prepare them for widening according to the data in the following table.
CAUTION • Do not braze on refrigerant pipes without a dry nitrogen gas injection system. Otherwise, a layer of rust will form that may become detached when the refrigeration system is started, causing filter or compressor blockages. • NEVER USE oxygen, acetylene or fluorocarbonated gas to replace nitrogen gas: this will cause an explosion or will generate toxic gas.
5.7 Line branch and header branch installation Install the distributor supplied by Hitachi on request. A tee can not be installed instead of a branch pipe. Fix the branch pipe horizontally to the pillar, wall or ceiling. Piping must not be fixed rigidly to the wall as thermal expansion and contraction can cause pipe fracture.
◆ Correct position of Line Branch E-SN/E-XN series Horizontal Vertical Straight length of the pipe connection on the outdoor unit side is made as follows: Locate the branch pipes on the same horizontal plane. (Inclination within 30°) - The collective pipe connection part is installed upward, the straight length must be minimum 0.5 m.
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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.
5.8.1 Outdoor unit stop valve Operation of stop valve should be performed according to the figures and tables below: Spindle Type Stop valve (liquid) Stop valve (gas) Spindle valve Closed upon factory shipping Flare nut C heck joint for service port ...
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.
6.1 RAS-(2-3)HVRC3 6.1.1 Refrigerant piping length The refrigerant piping between the indoor unit and the outdoor unit should be designed using the following chart. Keep the design point within the area of the chart, which is showing the applicable height difference according to piping length. Height difference (m) Total length between outdoor unit and each indoor unit RAS-(2-3)HVRC3...
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◆ Maximum refrigerant piping length Outdoor Unit 2 HP 2.5 HP 3 HP Actual length (L) Maximum piping length between the outdoor unit and the farthest indoor unit Equivalent length (EL) Total piping length 2 units (A+B+C) Maximum piping line after first branch 2 units (B, C) Main piping length A A >...
◆ Maximum height difference (clarification) NOTE All pictures are as example. Branch and headers are not showed as real sizes or real picture, for the installation of this components follow the technical documentation. 6.1.3 Combinations of piping size and piping length Liquid Ø6.35 Ø9.52...
6.1.4 Refrigerant piping size and Multi-Kit/distributor 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.
7.1 Setting of DIP switches for outdoor unit ◆ Quantity and position of DIP switches The PCB in the outdoor unit is operating with 9 types of DIP switches, and 4 push switches. The location is as follows: PCB1 PCB2 ◆...
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◆ DSW301: Test run mode DSW301 Factory setting Cooling Heating Forced stop of compressor ◆ DSW302: Piping Length Setting (Setting is required) DSW302 Factory setting Pipe length (<5m) Pipe length (≥30m) PMEN0654 rev.0 - 12/2023...
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◆ DSW3: Capacity Setting (No setting is required) DSW3 Model RAS-2HVRC3 Factory setting Model RAS-2.5HVRC3 Factory setting Model RAS-3HVRC3 Factory setting ◆ DSW4 / RSW1: Refrigerant cycle number setting (Setting is required) DSW4 Factory setting Setting for the tens digit RSW1 Factory setting Set by inserting slotted screwdriver into the...
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◆ DSW6: No setting is required (Do not change) DSW6 Factory setting ◆ DSW7: No setting is required (Do not change) DSW7 Factory setting PMEN0654 rev.0 - 12/2023...
8.1 Main concerns for commissioning 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 confirm that the electrical wiring and the refrigerant piping are correctly connected. CAUTION Do not operate the system until all the check points have been cleared: •...
9.1 Basic Method If the penetration of moisture is suspected, perform “Triple Evacuation Method” that is described in the next paragraph. • 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. •...
9.2 Triple Evacuation Method According to the following [Step 1] [Step 2] [Step 3] in order, conduct vacuum drying work. Step 1 1 Vacuum until the pressure reaches 2000 microns (2.0 mmHg). 2 Pressurize with nitrogen up to 0.3 MPaG (50 PSIG) for 15 minutes. 3 Release pressure until reaching the atmosphere level, as low as 0.03 MPaG (5 PSIG).
9.3 RAS-(2-3)HVRC3 vacuum pumping example Outdoor unit Nitrogen tank (for air tight test and nitrogen blow during brazing) Manifold gauge Gas line stop valve Vacuum pump Liquid line stop valve Cover the flare nut and union of the piping Gas line connection securely with thermal insulation Indoor unit Liquid line...
The refrigerant used in each unit is identified on the specification label and manuals of the unit. Hitachi shall not be held liable for any failure, trouble, malfunction or accident caused by units illegally charged with refrigerants other than the specified one.
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✓ Charge the proper quantity of refrigerant according to the piping length (Calculate the quantity of the refrigerant charge). Charged quantity needs to be controlled by a weighing equipment. ✓ Charge refrigerant by opening the gauge manifold valve. Charge the required refrigerant by operating the system in cooling.
10.2 RAS-(2-3)HVRC3 charging work example Outdoor unit Manifold Gauge Refrigerant tank (R32) Liquid line stop valve Weighing equipment Gas line stop valve Thermal insulation Gas line Indoor unit Liquid line Multi-Kit Thermal indoor until insulation for finishing work PMEN0654 rev.0 - 12/2023...
Refrigerant pump down 11.1 General considerations ..................48 11.2 RAS-(2-3)HVRC3 refrigerant pump down example .........48 PMEN0654 rev.0 - 12/2023...
11.1 General considerations When the refrigerant should be collected into the outdoor unit due to indoor/outdoor unit relocation, collect the refrigerant as follows: • Attach the manifold gauge to the gas stop valve and the liquid stop valve. • Turn ON the power source. •...
✓ Recommended number of indoor units to be connected: 64 Units per H-LINK II system. ✓ Maximum wiring length: total 1000 m (including CS-NET). In case that the total wiring length is longer than 1000 m, contact the Hitachi dealer. ✓ Recommended cable: twist pair cable with shield, over 0.75 mm2 (Equivalent to KPEV-S).
12.2 System installation DSW Setting DSW setting of indoor PCB and outdoor PCB for H-LINK II It is required to set DSW of every indoor unit and outdoor unit and match of the transmission circuit impedance. DSW Setting example: Cycle number 0 Cycle number 1 Cycle number 2 Terminating resistance...
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Outdoor unit RAS-(2-3)HVRC3 Function For setting refrigerant cycle address of outdoor unit. Set the DSW Refrigerant cycle DSW4 / RSW1 and RSW not to overlap the setting of other outdoor unit in the same H-LINK system. For matching impedance of transmission circuit, set the DSW5 Terminal resistance DSW5 according to the quantity of outdoor units in the H-LINK system.
Test run from outdoor unit side 13.1 RAS-(2-3)HVRC3 test run procedure ...............54 13.2 Test run check list ....................56 PMEN0654 rev.0 - 12/2023...
13.1 RAS-(2-3)HVRC3 test run procedure The procedure of test run from outdoor unit side is indicated below. Setting of this DSW is available with the power source ON. CAUTION • Do not touch any other electrical parts when operating switches on the PCB. •...
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Operation DSW Setting Operation Remarks • Do not repeat compressor ON/OFF Setting: When DSW301-4 is ON during frequently. compressor operation, the Compressor Manual OFF: DSW301-4 ON. compressor stops to operate immediately and the indoor unit is under the condition of Thermo-OFF.
13.2 Test run check list MODEL: SERIAL NUMBER: COMPRESSOR MANUFACTURER NUMBER: CUSTOMER’S NAME AND ADDRESS: DATE: Is the rotation direction of the indoor fan correct? Is the rotation direction of the outdoor fan correct? Are there any abnormal compressor sounds? Has the unit been operated at least twenty (20) minutes? Check room temperature Inlet...
14.1 On-screen display during abnormal operation PC-ARFG-E example Indoor unit number (Refrigerant system-address number) When more than one indoor unit is connected, press " " or " " to show other indoor units. Installed unit number Abnormal operation can be produced due to the following reasons: ◆...
✓ D: Model code. Model code Indication Model Heat pump Inverter Multi (SET FREE) Cooling only Other IVX, individual operation ✓ E: If there are various indoor units connected, the above mentioned information is shown for each one of them. ◆...
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Code Category Content of Abnormality Leading Cause Activation of protection device Activation of float switch (high water level in drain pan, Indoor Unit (float switch) abnormality of drain pipe, float switch, or drain pan) Activation of protection device Activation of PSH (pipe clogging, excessive refrigerant, Outdoor Unit (High pressure cut) inert gas mixing)
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Code Category Content of Abnormality Leading Cause Abnormality of indoor fan Abnormality of indoor fan motor (step-out), indoor fan system controller failure Indoor Fan Motor Activation of protection device Fan motor overheat, lockup for indoor fan Abnormality of fan controller fin Abnormality of fin thermistor or fan controller, heat temperature exchanger clogging, abnormality of fan motor...
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Code Category Content of Abnormality Leading Cause Abnormality of outdoor unit Outdoor unit capacity > permitted maximum capacity Incorrect setting of outdoor unit Incorrect setting of main and sub units(s) combination or models combination or voltage voltage Outdoor Unit Abnormal communication Incorrect wiring, disconnect wire, breaking wire, PCB between main unit and sub failure...
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Code Category Content of Abnormality Leading Cause Incorrect setting of unit model Incorrect setting of indoor unit model code Incorrect setting of unit and 64 or more number is set for address or refrigerant cycle refrigerant cycle number Abnormality of EEPROM EEPROM failure, incorrect data of EEPROM Indoor Unit Incorrect indoor unit number...
15.1 General considerations DANGER • Turn OFF the power source before the maintenance work. If not, it may cause a fire or an electric shock. • Perform the maintenance work with stable footing. If not, it may cause falling or injury. NOTE Do not operate the system without the air filter to protect the indoor unit heat exchanger against being clogged.
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3 Piping connection ✓ Leakage: Check for the refrigerant leakage at the piping connection. 4 Cabinet ✓ Stain and lubrication: Check for any stain and any lubrication. Remove the stain and the lubrication. ✓ Fixing screw: Check for any loosened screw or any lost screw. Fix the loosened screws and the lost screws.
16.1 Assigned models and quantity RAS-(2-3)HVRC3 Air flow guide AG-264 Wind guard WSP-SP10A Snow protection hood (Zinc plate) ASG-SP10FTB (Half) Air outlet ASG-SP11FTB (Full) ASG-SP10BTB Air inlet of rear side ASG-SP10LTB Air inlet of side face 16.2 Air flow guide 16.2.1 AG-264 ◆...
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◆ Air flow guide installation Air discharge grille 4xM5 fixing screw (Accessories) One air flow installation flow The holes for the attachment of the airflow guide shall be first opened using a M4x13 self-tapping screw at the designated locations, then removing Air flow guide the self-tapping screw and using the supplied...
16.4 Snow protection hood 16.4.1 Air discharge hood ASG-SP10FTB (Half) (1) Product name ASG-SP11FTB (Full) (2) Material Bonderized steel sheet Color Gray (1.0Y8.5/0.5) (1) 1.9 kg Weight (2) 4.3 kg Assembling Assembly on site Components Hood For air discharge part x1 (1) 7 x [M5x12] Fixing screw (2) 16 x [M5x12]...
16.4.2 Rear suction hood Product name ASG-SP10BTB Material Bonderized steel sheet Color Gray (1.0Y8.5/0.5) Weight 3.9 kg Assembling Assembly on site Components For rear side air intake x 1 Hood (Upper side x 1 lower side x 1) Fixing screw 4 x [M5x12] Hood fixing screw (SUS) 10 x [M5x12] Self-screw...
16.4.3 Left suction hood Product name ASG-SP10LTB Material Bonderized steel sheet Color Gray (1.0Y8.5/0.5) Weight 2.5 kg Assembling Assembly on site Components Hood For left side air intake x 1 Fixing screw 6 [M5x12] Hood fixing screw (SUS) 6 x [M5x12] Self-screw 2 (M4x13) Installation restriction...
16.4.4 Assembly of snow protection hood Rear side Left side Front side Fixing screw Air inlet hood Wire rope (optional for over turning protection) Air discharge hood Outdoor unit Left suction hood Air discharge grille NOTE • a > Maximum snowfall height. •...