What causes excessively low pressure difference in my Hitachi Air Conditioner?
Excessively low pressure difference in your Hitachi Air Conditioner is caused when the pressure ratio calculated from high pressure (Pd) and low pressure (Ps) is lower than 1.8 MPa during 3 minutes.
Why does my Hitachi RAS-4HVRNME-AF show a power phase detection abnormality?
A power phase detection abnormality in Hitachi Air Conditioner indoor units can be caused by an open phase in the power source wiring.
What causes suction pressure decrease prevention to activate in my Hitachi Air Conditioner?
Activation of suction pressure decrease prevention in your Hitachi Air Conditioner can be caused by a shortage or leakage of refrigerant, piping clogging, a close-locked expansion valve, or a locked fan motor.
What causes indoor unit number setting error in my Hitachi Air Conditioner?
Indoor unit number setting error in your Hitachi Air Conditioner can be caused if indoor units with the same number exist in a refrigerant piping system.
What causes outdoor temperature thermistor abnormality in my Hitachi RAS-4HVRNME-AF?
An outdoor temperature thermistor abnormality in your Hitachi Air Conditioner can be caused by a loose, disconnected, broken or short-circuited connector.
What causes abnormal transmission between Inverter PCB and Main PCB in my Hitachi RAS-4HVRNME-AF?
Abnormal transmission between Inverter PCB and Main PCB in your Hitachi Air Conditioner is caused if the communication between Main PCB (PCB1) and Inverter (DIP - IPM/ISPM) is not performed correctly during 30 seconds.
What causes Opentherm communication failure in my Hitachi RAS-4HVRNME-AF Air Conditioner?
Opentherm communication failure in your Hitachi Air Conditioner is caused if there is no Opentherm communication for a continuous period of 1 minute.
What causes RF communication failure in my Hitachi RAS-4HVRNME-AF?
RF communication failure in your Hitachi Air Conditioner happens when there is no communication for 1 hour with one or two RF receivers which are bound to the RF-Bridge.
What causes water DHWT thermistor abnormally (THM D-HWT) in my Hitachi Air Conditioner?
A water DHWT thermistor abnormality in your Hitachi Air Conditioner can be caused by a loose, disconnected, broken or short-circuited connector.
What causes inverter fin temperature abnormality in my Hitachi RAS-4HVRNME-AF Air Conditioner?
An inverter fin temperature abnormality in your Hitachi Air Conditioner can be caused by a fin thermistor abnormality, heat exchanger clogging, or fan motor abnormality.
Overview of safety precautions and warnings, including DANGER, WARNING, CAUTION.
Details on system compatibility, manual usage, and policy.
Specifies pressure limits and safety cut-out values for the system.
Highlights risks associated with pressure vessels and safety devices.
Pre-operation checks and precautions for compressor and system.
Includes 3-minute guard and auto restart after power failure.
Covers frost prevention, slow air control, and hot start during heating.
Details automatic defrosting cycle and overload prevention.
Immediate actions for smells or white smoke from the unit.
Describes normal sounds and steam generation.
Troubleshooting steps for no operation.
Checks for common cooling/heating performance issues.
Information to provide to service contractor.
Identifies components of the outdoor unit with diagrams.
Diagram illustrating the refrigerant flow and components.
Guidelines for installing outdoor units safely and effectively.
Clearance requirements for single units with blocked inlets.
Clearances for multiple units with blocked inlets.
Clearance requirements for single units with open upper side.
Clearances for multiple units with open upper side.
Clearance requirements for single units with blocked upper side.
Clearances for multiple units with blocked upper side.
Clearance for single units with blocked outlet side.
Clearances for multiple units with blocked outlet side.
Clearance for single units with blocked lateral side.
Clearance for stacking units vertically, single or multiple.
Clearance for units installed in multiple rows.
Requirements for concrete foundation and base installation.
Instructions for wall mounting the outdoor unit.
Guidelines for suspending the outdoor unit.
Recommendations for installing units in windy locations.
Details on selecting and preparing copper pipes for the system.
Methods for suspending refrigerant piping to prevent damage.
Procedure for connecting pipes to the outdoor unit from different directions.
Instructions for mounting piping cover to prevent water entry.
Specifications for tightening torque of pipe connections.
Chart for determining piping length based on height difference.
Procedure for setting pipe length using DSW2.
Specifications for gas and liquid pipe sizes for indoor/outdoor units.
Guidelines and precautions for pipe brazing with nitrogen gas.
Procedure for pressure measurement using check joints.
Warnings regarding charging gases and potential hazards.
Table of factory refrigerant charge amounts and pipe lengths.
Procedure for collecting refrigerant for relocation.
Description and connection procedure for the drain boss.
Important notes regarding drain boss usage in cold areas.
General checks for electrical components and compliance.
Precautions for wiring terminal blocks and electrical parts.
Safety warning about connecting/adjusting wiring with power off.
Diagrams for electrical wiring connections to outdoor units.
Details on the location and types of DIP switches on the PCB.
General wiring practices and compliance with local codes.
Instructions for wiring between indoor and outdoor units.
Attention to operating line connection for correct PCB function.
Recommended minimum wire sizes for field-provided wires.
Checks before performing the test run.
Visual inspection of the unit for damage and installation status.
Checks related to electrical resistance and connections.
Verification of stop valves, piping, and refrigerant charge.
Warning not to operate until all checks are cleared.
Procedure to configure and start the test run from the remote control.
Explains DSW1 settings for test run, operation mode, and compressor control.
Procedure for manually initiating and ending defrost operation.
Warnings about touching PCB and service covers during operation.
Details on high pressure switch and control circuit fuses.
Explanation of fan motor output reduction based on thermistor temperature.
Overview of alarm codes displayed on the remote control.
Troubleshooting table for various alarm codes and their causes.
Troubleshooting table for various alarm codes and their causes.
General| Cooling Capacity | 4.0 kW |
|---|---|
| Refrigerant | R32 |
| Power Supply | 220-240V, 50Hz |
| Type | Split |
| Outdoor Unit Dimensions (HxWxD) | 780 mm |
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