Hitachi RAS-4.5HNBRKQ1 - Removing Upper Cover

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MAINTENANCE

1.3 Removing Upper Cover

After removing the securing screws for the upper cover, lift the upper cover up.

Tool Gloves, Phillips Screwdriver

Model: 3~3.5HP Model: 4~6.5HP

Model: 7~12HP

Main Page

Table of Contents2
Installation8
Before Installation9
Necessary Tools and Instrument List for the Installation9
Structure11
Refrigerant Cycle Diagram14
Model of Outdoor Unit15
Transportation16
Factory Supplied Accessories17
Outdoor Unit Installation18
Installation Location and Precautions18
Service Space20
Installation Work23
Refrigerant Piping Work25
Precaution for Refrigerant Piping25
Model of Branch Pipe28
Refrigerant Piping Size29
Refrigerant Piping Work for Outdoor Unit31
Air Tight Test33
Vacuuming34
Additional Refrigerant Charge Calculation35
Additional Refrigerant Charge Work36
Pressure Measurement37
Electrical Wiring37
General Check38
Electrical Wiring Connection39
Electrical Wiring for Outdoor Unit41
DIP Switch Setting of Outdoor Unit43
Test Run45
Before Test Run45
Test Run by DIP Switch of Outdoor Unit45
Test Run by Wired Controller46
Safety and Control Device Setting47
Drain Adapter: DC-01Q (Optional Parts)48
Troubleshooting50
Initial Troubleshooting51
Checking Electrical Wiring and Power Source51
Location of Printed Circuit Boards53
Checking Rotary Switch and DIP Switch Settings61
Checking Wired Controller64
Checking of Protection Control Information79
Troubleshooting Procedures80
Alarm Code Indication of Wired Controller80
Troubleshooting Using Alarm Codes81
Procedures for Checking112
Checking Method for Outdoor Unit PCB of 3~6.5HP112
Checking Method for PCBA of 7~12HP116
Checking Method of Electronic Expansion Valve122
Maintenance123
Outdoor Unit124
Removing Service Cover124
Removing Air Outlet Grille125
Removing Upper Cover126
Removing Lower Service Cover and Rear Cover127
Removing Outdoor Fan Motor128
Removing Electrical Box130
Removing Compressor134
Removing High Pressure Switch and Pressure Sensor136
Removing 4-Way Valve Coil137
Removing Electronic Expansion Valve Coil138
Removing Solenoid Valve Coil (SVA)139
Removing 4-Way Valve140
Removing Electronic Expansion Valve and Solenoid Valve141
Main Parts142
Inverter142
Rotary Compressor146
Scroll Compressor147
Thermistor148
Electronic Expansion Valve for Outdoor Units149
Pressure Sensor150
High Pressure Switch151
Noise Filter (NF1)151
Reader (DCL)152
External Input/Output and Function Setting153
External Input/Output Setting Method154
Exteral Input and Output Settings156
Definition of External Input and Output Settings156
External Input Function Setting157
External Output Function Setting161
Function Setting163
Service and Maintenance Record by 7-Segment Display166
Field Work Instructions167
Caution for Refrigerant Leakage168
Modifications of Charging Refrigerants168
Maintenance Work168
Service and Maintenance Record170
Saturation Curve for Refrigerant171
Service Parts List172

Hitachi RAS-4.5HNBRKQ1 - Removing Upper Cover

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