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General| Brand | Hitachi |
|---|---|
| Model | RAM-18QH5E |
| Category | Air Conditioner |
| Language | English |
Procedures for handling semiconductors to prevent damage.
Specifies maximum pipe length for installation.
Details height difference limits for installation.
Instructions for connecting pipes, including torque specifications.
How to manage outdoor unit condensed water drainage.
Guidance for using and installing in cold climates.
Details on securely connecting power and connecting cords.
Specifications and connection details for the fan motor.
Specifications and connection details for the compressor.
Cooling capacity vs. ambient temperature with room temp at 27°C.
Heating capacity vs. ambient temperature with room temp at 20°C.
Cooling capacity ratio adjustment for piping length.
Heating capacity ratio adjustment for piping length.
Wiring diagram for the outdoor unit.
Circuit diagram for the remote control unit.
Block diagram of the outdoor unit's system components.
Details the sequence and timing of basic cooling operation.
Describes the 'New Cool Rhythm' operation mode.
Details the 'Cooling Sleep Operation' mode and its parameters.
Describes the dehumidifying operation mode and its timing.
Explains the cooling defrost cycle sequence and timing.
Details the sequence and timing of basic heating operation.
Describes the 'Heating Sleep Operation' mode and its parameters.
Lists the conditions required for defrost to start.
Lists the conditions under which defrost is released.
Describes the outputs and actions during defrost operation.
Conditions required for the auto-fresh defrost to initiate.
Conditions for releasing the auto-fresh defrost.
Describes outputs during auto-fresh defrost operation.
Conditions for initiating forced cooling operation.
Details the operation status during forced cooling.
Illustrates the refrigerating cycle for cooling, dehumidifying, and defrosting.
Illustrates the refrigerating cycle during heating operation.
Explains the operation of the outdoor unit's power circuit.
Details the system power module and its functions.
Explains the function of the diode stacks in the power circuit.
Describes the role of smoothing capacitors in the power circuit.
Explains the function of additional smoothing capacitors.
Explains noise absorption components in the power circuit.
Describes surge absorbers and varistors for power surge protection.
Explains the inrush protective resistor's function.
Details communication from indoor to outdoor microcomputers.
Details the peak current cut-off circuit operation and waveforms.
Explains the external overload judgment circuit and its function.
Describes the voltage amplifier circuit for overload detection.
Flowchart for troubleshooting outdoor unit electrical parts.
Troubleshooting steps for when fan rotation speed does not increase.
Important precautions to take before checking the unit.
Steps to troubleshoot when the outdoor unit doesn't operate but receives signals.
Identifies the location of the self-diagnosis lamps on the circuit board.
Explains the different lighting modes of the self-diagnosis lamps.
Shows the element circuit of the system power module.
Illustrates the internal circuitry of the system power module.
Shows the terminal symbols for the system power module.
Instructions for checking the power module using a tester.
Procedure for judging gas leakage vs. compressor defect.
