Hitachi RCI User Manual

5.2 Safety protection and control
Compressor protection
The compressor is protected by the following devices:
• High pressure switch: this stops the compressor when the discharge pressure exceeds the set value.
• Oil heater: this prevents oil from being lost during cold starts, as it is enabled while the compressor is at a standstill.
• Fan motor protection: internal thermostat located in the fan motor winding. This stops the fan motor when the winding
temperature exceeds the set value.
Setting control and safety devices for indoor units
Model RCI(M) RCD RPC RPIM RPI RPK RPF(I) Remarks
For the evaporator fan
motor: Internal thermostat
Switch
off
°C 145±5 130±5 135±5 135±5 140±5 130±5 130±5
Automatic reset, non-
adjustable (one per
motor)
Switch
on
°C 90±15 83±15 90±15 90±15 90±15 83±15 83±15
For the control circuit: Fuse
capacity
– A 5
Freeze protection
thermostat:
Switch
off
°C 0
Switch
on
°C 14
Differentialthermostat – °C 2
5 Control system
175
SMGB0063 rev. 1 - 10/2010
5

Hitachi RCI Specifications

General

Brand	Hitachi
Model	RCI
Category	Air Conditioner
Language	English

Summary

General Information and Safety

Safety Symbols and Precautions

Explains safety symbols (Danger, Caution, Note) and general safety guidelines for unit installation and operation.

Unit Installation

RCI 4-way Cassette Unit Installation

RPI/RPIM Ducted Unit Installation

RPK Wall Mounted Unit Installation

RPF/RPFI Floor Unit Installation

Piping Work and Refrigerant Charge

Gas Refrigerant Pipe Selection

Guidelines for selecting correct gas refrigerant pipe sizes based on outdoor unit power.

Copper Pipe Specifications and Connections

Refrigerant and Drain Hose Installation

Specific instructions for installing refrigerant pipes and drain hoses for various indoor unit types.

Electrical Wiring

Unit Electrical Wiring and Connection

General guidelines for wiring, main switch selection, and power cable sizing.

Setting of DIP switches and RSW switches

Control System

Device Control System Overview

Explains the purpose of control for compressor, expansion valves, fans, and solenoid valves.

Test Run

Pre-Test Run Checks and Procedures

Essential checks and procedures before performing the system test run.

Test Procedure with Remote Control

Step-by-step guide for conducting the test run using a wired remote control.

Test Run Checklist

Troubleshooting

RPK Unit PCB Self-Check

Procedure for self-checking the indoor unit PCB using relays and DIP switches.

Electronic Expansion Valve Check Procedure

Servicing Procedures

RCI 4-way Cassette Servicing

Step-by-step guide for removing components of RCI 4-way cassette units.

RCIM Compact Cassette Servicing

Step-by-step guide for removing components of RCIM compact cassette units.

RCD 2-way Cassette Servicing

RPK Wall Mounted Unit Servicing

RPF(I) Floor Unit Servicing

Electrical Checks of Main Parts

Thermistor Electrical Checks

Electronic Expansion Valve Checks

Maintenance Notes

Regular Equipment Maintenance Procedures

Indoor Heat Exchanger Cleaning Guide

Refrigerant Collection for Replacement

Procedure for safely collecting refrigerant when replacing an indoor unit.