Hitachi RAS-20FS3 User Manual

Models
<Indoor Units>
• In-the-Ceiling Type
RPI-0.8FSG1 RPI-2.5FSG1 RPI-8FSG1
RPI-1.0FSG1 RPI-3.0FSG1 RPI-10FSG1
RPI-1.5FSG1 RPI-4.0FSG1
RPI-2.0FSG1 RPI-5.0FSG1
• 4-Way Cassette Type
RCI-1.0FSG2 RCI-2.5FSG2 RCI-5.0FSG2
RCI-1.5FSG2 RCI-3.0FSG2
RCI-2.0FSG2 RCI-4.0FSG2
• 2-Way Cassette Type
RCD-1.0FSG1 RCD-2.5FSG1 RCD-5.0FSG1
RCD-1.5FSG1 RCD-3.0FSG1
RCD-2.0FSG1 RCD-4.0FSG1
•Wall Type
RPK-1.0FSGM6 RPK-2.0FSGM6
RPK-1.5FSGM6 RPK-2.3FSGM6
• Floor Type
RPF-1.0FSG(E) RPF-1.5FSG(E)
• Floor Concealed Type
RPFI-1.0FSG(E) RPFI-1.5FSG(E)
• Ceiling Type
RPC-2.0FSG1 RPC-3.0FSG1 RPC-5.0FSG1
RPC-2.5FSG1 RPC-4.0FSG1
<Outdoor Units>
• FSG(1) Series
RAS-5FSG RAS-16FSG RAS-24FSG1
RAS-8FSG RAS-20FSG RAS-30FSG1
RAS-10FSG
•FS3, FS5 Series
RAS-5FS3 RAS-16FS3 RAS-24FS5
RAS-8FS3 RAS-20FS3 RAS-30FS5
RAS-10FS3
• FXG Series
RAS-8FXG RAS-10FXG
• FX3 Series
RAS-8FX3 RAS-10FX3
<System Equipment>
•Total Heat Exchangers
KPI-2521 KPI-5021 KPI-8021 KPI-10021
This service mamual provides the technical
information for the HITACHI Inverter-Driven
Multi-Split System Heat Pump Air
Conditioners, “SET FREE, FSG(1)/FS3, FS5
and FXG/FX3 Series”.
Read this manual carefully before starting
service activities.
HITACHI INVERTER-DRIVEN
MULTI-SPLIT SYSTEM
HEAT PUMP AIR CONDITIONERS
SET FREE FSG(1)/FS3, FS5 SERIES
AND
SET FREE FXG/FX3 SERIES
P5413553

Hitachi RAS-20FS3 Specifications

General

Type	Split System
Cooling Capacity	2.0 kW
Heating Capacity	2.5 kW
Power Supply	220-240V, 50Hz
Refrigerant	R410A
Energy Efficiency Ratio (EER)	3.21
Coefficient of Performance (COP)	3.61
Indoor Unit Weight	9 kg
Noise Level (Outdoor)	48 dB

Summary

SERVICE MANUAL

1. TROUBLESHOOTING

1.1 Initial Troubleshooting

Basic checks and initial diagnostics for unit operation.

1.2 Troubleshooting Procedure

Systematic steps for diagnosing issues using alarm codes and displays.

1.3 Procedure of Checking Each Main Parts

Methods for self-checking PCBs and major components.

1.4 Test Run

Verifying system operation and performance after installation or repair.

2. SERVICING

2.1 Outdoor Unit

Procedures for servicing and disassembling outdoor unit components.

2.2 In-the-Ceiling Type (RPI-0.8FSG1 to RPI-5.0FSG1)

Servicing steps specific to RPI ceiling units.

2.3 In-the-Ceiling Type (RPI-8FSG1 and RPI-10FSG1)

Servicing steps for larger RPI ceiling units.

2.4 4-Way Cassette Type

Servicing procedures for 4-way cassette indoor units.

2.5 2-Way Cassette Type

Servicing procedures for 2-way cassette indoor units.

2.6 Wall Type

Servicing procedures for wall-mounted indoor units.

2.7 Floor Type

Servicing procedures for floor-standing indoor units.

2.8 Floor Concealed Type

Servicing steps for concealed floor-type indoor units.

2.9 Ceiling Type

Servicing procedures for ceiling-mounted indoor units.

2.10 Total Heat Exchanger

Servicing and cleaning of the total heat exchanger unit.

2.11 Cleaning Indoor Unit Heat Exchanger

Procedures for cleaning indoor unit heat exchangers.

2.12 Collecting Refrigerant for Replacing Indoor Unit

Steps for safely collecting refrigerant.

3. MAIN PARTS

3.1 Inverter

Details on inverter specifications and protection functions.

3.2 AC Chopper

Explanation of AC Chopper control for fan motors.

3.3 Auto-Louver Mechanism

Description of auto-louver operation and parts.

3.4 Scroll Compressor

Structure and operating principle of scroll compressors.

3.5 Thermistor

Information on thermistors used in indoor and outdoor units.

3.6 Electronic Expansion Valve

Specifications and operation of EEVs.

3.7 Pressure Sensor

Details on high and low pressure sensors.

3.8 High Pressure Protection Device

Explanation of the high pressure protection system.

3.9 Noise Filter (NF)

Role and specifications of noise filters.

3.10 Capacitor (CB1, CB2)

Information on capacitors used in the system.

3.11 Reactor (DCL)

Details on reactors used for the inverter.

4. OPTIONAL FUNCTION

4.1 Indoor Unit

Optional functions for indoor units.

4.2 Indoor Unit

Advanced settings for specific indoor unit models.

4.3 Outdoor Unit

Optional functions related to outdoor unit control and operation.

4.4 Remote Control Switch, PC-P1H and PC-2H2

Details on wired remote control options.

4.5 Wireless Remote Control Switch, PC-LH3

Information on wireless remote control setup.

4.6 7-Day Timer, PSC-5T

Functionality and operation of the 7-day timer.

4.7 Central Station, PSC-5S

Overview of the central station control system.

5. FIELD WORK INSTRUCTION

5.1 Burnt-out Compressor due to Insufficient Refrigerant Charge

Case study on compressor failure due to low refrigerant.

5.2 Insufficient Cooling Performance When A Long Piping Is Applied

Troubleshooting long piping issues affecting cooling performance.

5.3 Abnormally High Operating Sound [In-the-Ceiling Type Indoor Unit]

Diagnosing and resolving high sound levels in ceiling units.

5.4 Alarm Code “31”

Guidance for resolving issues indicated by Alarm Code 31.

5.5 Not Cooling Well due to Insufficient Installation Space for Outdoor Unit

Addressing cooling issues caused by inadequate outdoor unit installation space.

5.6 Attention for SET-FREE FXG/FX3 Series

Key considerations for specific SET-FREE FXG/FX3 series.

5.7 Select Guide of Drain Pipe for Indoor Unit

Guidelines for selecting appropriate indoor unit drain pipes.

5.8 Caution on Refrigerant Leakage

Safety and regulatory notes on handling refrigerant leakage.

5.9 Maintenance Work

General maintenance checks for indoor and outdoor units.

5.10 Service & Maintenance Record by 7-Segment Display

Recording maintenance data logged via the 7-segment display.

5.11 Service & Maintenance Record by Remote Control Switch

Recording maintenance data logged via the remote control switch.

5.12 Service & Maintenance Record

General record keeping for service activities.