Service Manual

ManualsBrandsHitachi ManualsAir ConditionersHitachi RAS-3-HVNC

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Table Of Contents

Contents
1. General information
- 1.1 General information
- 1.2 Safety
  - 1.2.1 Applied symbols
  - 1.2.2 Norms and Regulations
- 1.3 Product guide
2. Unit Installation
- 2.1 Safety summary
- 2.2 Transportation of outdoor unit
- 2.3 Center of gravity
- 2.4 Factory-supplied accessories for RAS-12HN(P/C)
- 2.5 Installation space (Initial ckeck)
- 2.6 Place provision
  - 2.6.1 Place provision for RAS-(2-2.5)HVNP / RAS-3HVNC
  - 2.6.2 Place provision for RAS-3HVNPE / RAS-(4-6)H(V)N(P/C)E / RAS-(8-10)HN(P/C)E / RAS-12HN(P/C)
- 2.7 Optional parts and installation
3. Piping work and refrigerant charge
- 3.1 General notes before performing pipe work
- 3.2 Piping connection for outdoor unit
- 3.3 Refrigerant piping range
- 3.4 Refrigerant charge
  - 3.4.1 Caution of the pressure by check joint
  - 3.4.2 Refrigerant charge quantity
- 3.5 Caution in case of refrigerant leakage
- 3.6 Piping work for compatibility with the piping of current installations where is used R22 or R407C.
- 3.7 Drain piping
  - 3.7.1 Drain discharging boss
4. Electrical wiring
- 4.1 General notes
  - 4.1.1 General check
- 4.2 Electrical wiring connection for the outdoor unit
- 4.3 Setting the DIP switches for the outdoor unit
- 4.4 Common wiring
  - 4.4.1 Electrical wiring between outdoor and indoor unit
  - 4.4.2 Wire size
- 4.5 H-LINK II system
- 4.6 System Control
  - 4.6.1 Individual Operation
  - 4.6.2 Simultaneous Operation
- 4.7 Electrical wiring diagrams
5. Control System
- 5.1 Device control system
- 5.2 Outdoor units PCB
- 5.3 Protection and safety control
- 5.4 Standard operation sequence
- 5.5 Standard control functions
6. Optional functions
- 6.1 Optional input and output signals (By 7-segment display)
- 6.2 Optional functions (By 7-segment display)
  - 6.2.1 Setting of the optional functions
  - 6.2.2 Description of the optional functions
- 6.3 Optional functions (By remote control switch)
7. Test run
- 7.1 Checking procedure before the test run
- 7.2 Test run procedure using the remote control switch (PC-ART)
- 7.3 Test run procedure using the remote control switch (PC-ARF)
- 7.4 Test run procedure using the wireless remote control switch (PC-LH3A/B)
- 7.5 Test run procedure from the outdoor unit side
- 7.6 Check list
  - 7.6.1 Check list on test run
  - 7.6.2 Check list on compressor
8. Troubleshooting
- 8.1 Initial troubleshooting
- 8.2 Troubleshooting procedure
- 8.3 Troubleshooting in check mode
- 8.4 Checking procedure for main parts
9. Spare parts
- 9.1 RAS-(2-2.5)HVNP
  - 9.1.1 Cycle and structural parts
  - 9.1.2 Parts table
- 9.2 RAS-3HVNC
  - 9.2.1 Cycle and structural parts
  - 9.2.2 Parts table
- 9.3 RAS-3HVNPE
- 9.4 RAS-(4-6)H(V)NPE
- 9.5 RAS-(4-6)H(V)NCE
- 9.6 RAS-(8-10)HN(P/C)E
- 9.7 RAS-12HN(P/C)
10. Servicing
- 10.1 Introduction
- 10.2 Servicing for Outdoor Units RAS-(2-2.5)HVNP and RAS-3HVNC
- 10.3 Servicing for Premium series
- 10.4 Servicing for Standard Series
11. Electrial checks of main parts
- 11.1 Inverter
- 11.2 Thermistor
- 11.3 Electronic expansion valve
- 11.4 High pressure protection device
- 11.5 Noise filter (NF)
  - 11.5.1 Noise filter for 3N~ (400V/50Hz)
  - 11.5.2 Noise filter for 1~ (230V/50Hz)
- 11.6 Capacitor (CB1 CB2)
- 11.7 Reactor (DCL)
  - 11.7.1 Reactor (DCL) for 3N~ (400V/50Hz)
  - 11.7.2 Reactor (DCL) for 1~ (230V/50Hz)
- 11.8 Scroll compressor
  - 11.8.1 Reliable mechanism for low vibrating and low sound
  - 11.8.2 Principle of compression
12. Maintenance notes
- 12.1 General notes
- 12.2 Maintenance work
- 12.3 Service and maintenance record
- 12.4 Service and maintenance record using the 7-segment display
- 12.5 Service and maintenance record by remote control switch
- 12.6 Pump-down method for replacing the compressor
General information
- General notes
- Introduction
- Environment-friendly units
Safety
- Applied symbols
- Norms and Regulations
Product guide
- Classification of outdoor unit models
- Classification of indoor unit models
- Product guide: Outdoor units
- Outdoor unit accessory code list
- Product guide: Indoor units & complementary systems
- Product guide: complementary systems
Safety summary
Transportation of outdoor unit
Center of gravity
Factory-supplied accessories for RAS-12HN(P/C)
Installation space (Initial ckeck)
- Basic sizes
- RAS-(2-2.5)HVNP / RAS-3HVNC
- RAS-3HVNPE / RAS-(4-6)H(V)N(P/C)E / RAS-(8-10)HN(P/C)E / RAS-12HN(P/C)
Place provision
- Place provision for RAS-(2-2.5)HVNP / RAS-3HVNC
- Place provision for RAS-3HVNPE / RAS-(4-6)H(V)N(P/C)E / RAS-(8-10)HN(P/C)E / RAS-12HN(P/C)
Optional parts and installation
- Optional parts and installation for RAS-(2-2.5)HVNP / RAS-3HVNC
- Optional parts and installation RAS-3HVNPE / RAS-(4-6)H(V)NCE
- Optional parts and installation RAS-(4-6)H(V)NPE / RAS-(8-10)HN(P/C)E
- Optional parts and installation RAS-12HN(P/C)
General notes before performing pipe work
- Piping Materials
- Three principles on refrigerant piping work
- Suspension of refrigerant piping
- Brazing work
Piping connection for outdoor unit
- RAS-(2-2.5)HVNP / RAS-3HVNC
- RAS-3HVNPE / RAS-(4-6)H(V)N(P/C)E / RAS-(8-10)HN(P/C)E / RAS-12HN(P/C)
- Outdoor unit stop valve
Refrigerant piping range
- Refrigerant piping length
- Piping system for header branch
- Piping system for line branch
- Combinations of piping size and piping length
- Refrigerant piping size and multikit/distributor selection
- System installation
- Connecting flare adapter
Refrigerant charge
- Caution of the pressure by check joint
- Refrigerant charge quantity
Caution in case of refrigerant leakage
- Maximum permitted concentration of hydrofluorocarbon (HFC)
- Calculation of refrigerant concentration
- Countermeasure for refrigerant leakage
Piping work for compatibility with the piping of current installations where is used R22 or R407C.
- Installation procedure for existing pipes
- When existing Air-Conditioner is a product of another manufacturer
- Permissible range for existing Air-Conditioning Pipes (Pipe length in the case of “without cleaning process”.
- Renewal kit selection model
Drain piping
- Drain discharging boss
General notes
- General check
Electrical wiring connection for the outdoor unit
Setting the DIP switches for the outdoor unit
- Quantity and position of DIP switches
- Function of the of DIP switches and RSW switches
- Jumpers
- LED’s indication
Common wiring
- Electrical wiring between outdoor and indoor unit
- Wire size
H-LINK II system
- Features
- Specifications
- DIP Switch setting for twin, triple and quad systems
- Examples of the system of connection between H-LINK and H-LINK II units
- Examples of H-LINK II system
System Control
- Individual Operation
- Simultaneous Operation
Electrical wiring diagrams
- RAS-(2-2.5)HVNP / RAS-3HVNC (1~ 230V 50Hz)
- RAS-3HVNPE (1~ 230V 50Hz)
- RAS-(4-6)HVNPE (1~ 230V 50Hz)
- RAS-(4-6)HNPE (3N~ 400V 50Hz)
- RAS-(4-6)HVNCE (1N~ 230V 50Hz)
- RAS-(4-6)HNCE (3N~ 400V 50Hz)
- RAS-(8-10)HN(P/C)E (3N~ 400V 50Hz)
- RAS-12HNP (3N~ 400V 50Hz) - Preliminary data
- RAS-12HNC (3N~ 400V 50Hz) - Preliminary data
Device control system
Outdoor units PCB
- RAS-(2-2.5)HVNP / RAS-3HVNC
- RAS-3HVNPE
- RAS-(4-6)H(V)NPE
- RAS-(4-6)H(V)NCE
- RAS-(8-10)HN(P/C)E
- RAS-12HNP - Preliminary data
- RAS-12HNC - Preliminary data
Protection and safety control
Standard operation sequence
- Cooling operation
- Dry operation
- Heating operation
- Automatic cooling and heating operation
- Defrost operation control
Standard control functions
- Freezing protection during cooling process or dry operation
- Prevention Control for High Pressure Increase during Cooling Operation
- Prevention control for excessively high discharge gas temperature
- Activation for protection device control
- Preheating control of compressor
- Prevention control for high pressure increase
Optional input and output signals (By 7-segment display)
- Available ports
- Available optional signals
- Setting of the optional signals
- Description of optional signals
Optional functions (By 7-segment display)
- Setting of the optional functions
- Description of the optional functions
Optional functions (By remote control switch)
Checking procedure before the test run
Test run procedure using the remote control switch (PC-ART)
Test run procedure using the remote control switch (PC-ARF)
Test run procedure using the wireless remote control switch (PC-LH3A/B)
Test run procedure from the outdoor unit side
Check list
- Check list on test run
- Check list on compressor
Initial troubleshooting
- Checking by means of the 7-segment display
- Failure of the power supply to the indoor unit and the remote control switch
- Abnormal transmission between the remote control switch and the indoor unit
- Abnormal operation of the devices
Troubleshooting procedure
- Alarm display
- Alarm codes for the outdoor and indoor units
- Troubleshooting by alarm code for the outdoor and indoor units
- Alarm codes for the KPI (E/H/X)3E Series and DX Interface
Troubleshooting in check mode
- Troubleshooting using the remote controller PC-ART
- Troubleshooting using the remote controller PC-ARF
- Troubleshooting using the 7 segment display
Checking procedure for main parts
- Procedure for checking the DIP-IPM inverter for indoor and outdoor units
- Checking capacitors CB1 & CB2.
- Fault diagnosis of DC fan motor.
- Checking procedure for the electronic expansion valve for indoor and outdoor units
- Checking procedure for AC fan motor
- Checking procedure for other parts
RAS-(2-2.5)HVNP
- Cycle and structural parts
- Parts table
RAS-3HVNC
- Cycle and structural parts
- Parts table
RAS-3HVNPE
- Cycle and structural parts
- Electrical parts
- Parts name
RAS-(4-6)H(V)NPE
- Cycle and structural parts
- Electrical parts
- Parts name
RAS-(4-6)H(V)NCE
- Cycle and structural parts
- Electrical parts
- Parts name
RAS-(8-10)HN(P/C)E
- Cycle and structural parts
- Electrical parts
- Parts name
RAS-12HN(P/C)
- Cycle and structural parts
- Electrical parts
- Parts name
Introduction
Servicing for Outdoor Units RAS-(2-2.5)HVNP and RAS-3HVNC
- Removing pipe cover
- Removing front cover
- Removing outdoor fan
- Removing the compressor
- Removing high pressure switch and pressure switch for control
- Removing four-way valve coil
- Removing electronic expansion valve coil
- Removing electrical components
Servicing for Premium series
- Outdoor unit RAS-3HVNPE
- Outdoor units RAS-(4-6)H(V)NPE
- Oudoor units RAS-(8-10)HNPE
- Outdoor Units RAS-12HNP
Servicing for Standard Series
- Outdoor Units RAS-(4-6)H(V)NCE
- Outdoor Units RAS-(8-10)HNCE
- Outdoor Units RAS-12HNC
Inverter
- Specifications of inverter
- Inverter time chart
- Protective function
- Overload control
Thermistor
Electronic expansion valve
High pressure protection device
Noise filter (NF)
- Noise filter for 3N~ (400V/50Hz)
- Noise filter for 1~ (230V/50Hz)
Capacitor (CB1 CB2)
Reactor (DCL)
- Reactor (DCL) for 3N~ (400V/50Hz)
- Reactor (DCL) for 1~ (230V/50Hz)
Scroll compressor
- Reliable mechanism for low vibrating and low sound
- Principle of compression
General notes
- Checking the power source and the wiring connection
- Burnt-out compressor due to an insufficient refrigerant charge
- Insufficient cooling performance when a long piping is applied
- Abnormally high operation sound (in the ceiling type indoor unit).
- Alarm code “31”
- Not cooling well due to insufficient installation space for the outdoor unit
Maintenance work
Service and maintenance record
Service and maintenance record using the 7-segment display
Service and maintenance record by remote control switch
Pump-down method for replacing the compressor

5. Control System

135

SMGB0079 rev.0 - 01/2013

5.4.5 Defrost operation control

Power to

YH2:ON

After 30

seconds

After 90

seconds *

* DSW2-1 ON (and DSW2-2ON for RAS-2.5HVNP)

RAS-(2-2.5)HVNP / RAS-3HVNC

Other than above

demand

frequency

90Hz

<90Hz

Power to

YH2:OFF

Power to

YH2:ON