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General| Brand | Mitsubishi Heavy Industries |
|---|---|
| Model | AHU-KIT-SP |
| Category | Air Handlers |
| Language | English |
Defines Air Handling Unit, AHU-KIT-SP, system types, and components.
Guides on selecting outdoor units and designing heat exchangers via a check sheet.
Describes a single refrigerant line system controlled by one AHU Interface.
Details AHU Interface master input switches, dip switches, and shorting plugs for configuration.
Covers operation commands, mode selection, and outdoor unit control methods (Capacity/Temperature).
Explains systems with multiple refrigerant lines and outdoor units connected via cascade control.
Details input switch settings and master/slave functions for cascade control.
Lists Modbus communication parameters like transmission mode, speed, data bits, parity, and connection.
Describes Modbus function codes for operations like reading and writing registers.
Outlines Modbus data types, lengths, and address ranges for input and holding registers.
Details the timing intervals and frame structure for Modbus communication.
Lists input registers, their data addresses, items, ranges, units, and notes.
Explains how the system prevents frosting by monitoring AHU heat exchanger temperature.
Describes the protection mechanism against compressor overheating during heating operations.
Details 3-minute timers preventing rapid compressor cycling for protection and forced operation.
Covers fan operation logic during defrost and heating oil return cycles.
Explains compressor shutdown based on suction temperature limits during cooling and heating.
Describes sensor fault detection for broken wires or short circuits leading to compressor stop.
Outlines how system errors and troubles are detected, including master/slave communication issues.
Explains how errors are displayed via PCB LEDs, remote control, and Modbus communication.
Details the procedure to reset errors using system Run/Stop operations.
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