This document is an installation manual for an LG AHU EEV Kit, specifically model PRLK096A0, designed for use with air conditioning systems. The manual provides comprehensive instructions for the mechanical and electrical installation of the kit, as well as guidelines for thermistor installation and troubleshooting.
Function Description:
The AHU EEV Kit (Electronic Expansion Valve Kit) is a critical component in an air conditioning system, particularly for Air Handling Units (AHUs) integrated with LG Multi V outdoor units. Its primary function is to precisely control the flow of refrigerant into the evaporator coil of the AHU. The Electronic Expansion Valve (EEV) is a sophisticated metering device that regulates the amount of refrigerant based on various system parameters, such as evaporator temperature and pressure, to optimize cooling or heating performance and efficiency. By accurately controlling refrigerant flow, the EEV helps maintain desired indoor temperatures, prevent evaporator freeze-up, and ensure the overall stable and efficient operation of the air conditioning system. The kit includes the EEV assembly, along with necessary components for installation, such as piping, brackets, a terminal box, and thermistors.
Important Technical Specifications:
- Model: PRLK096A0
- Type: AHU EEV Kit
- Power Supply: DC 12V
- Dimensions (W x D x H): 217 mm x 83 mm x 404 mm
- Weight (NET/Gross): 3.3 kg / 3.8 kg
- Pipe Size: Ø12.7 mm (1/2") for refrigerant piping.
- Refrigerant Compatibility: Specifically designed for R410A refrigerant, requiring R410A-specific piping, flare nuts, and tools to prevent abnormally high pressure in the refrigerant cycle.
- Thermistor Models: EBG61287703 (Pipe_In), EBG61287704 (Pipe_Out), EBG36949303 (Room thermistor - optional accessory).
- Communication: Connects to the AHU Control Kit (PRCKA0/PRDCA0) for power supply and communication with the outdoor unit.
- Residual Oil: Desirable amount of residual oil less than 40 mg/10m.
Usage Features:
- Optimized Refrigerant Control: The EEV precisely meters refrigerant flow, contributing to efficient cooling and heating performance of the AHU.
- Integration with Multi V Systems: Designed to seamlessly integrate with LG Multi V outdoor units, ensuring compatibility and coordinated operation.
- Prevention of Freeze-up: Proper installation of pipe thermistors is crucial to protect the evaporator against freeze-up, which is evaluated during test operation.
- Flexible Installation: The manual provides clear instructions for mounting the EEV Kit box and connecting field piping and electrical wiring.
- Optional Accessories: Supports optional accessories like a remote controller (PQRCUSA0) and a dry contact PCB (PQDSBNGCM0) for enhanced control and integration.
Maintenance Features:
- Regular Air Filter Cleaning: The manual emphasizes cleaning the air filter every 2 weeks to prevent dust and impurities from blocking airflow or weakening cooling/dehumidifying functions. This is a general tip for the air conditioner, not specifically the EEV kit, but it highlights overall system maintenance.
- Leakage Test: A critical maintenance step during installation is performing a leakage test by pressurizing nitrogen gas up to 3.8 MPa (38.7 kgf/cm²) for 24 hours to ensure no refrigerant leaks.
- Brazing with Nitrogen Blow: When brazing, it is essential to carry out a nitrogen blow at 0.02 MPa to prevent the formation of oxidized film inside the pipes, which can adversely affect valves and compressors.
- Protection During Brazing: During brazing, filters and the EEV body must be cooled with a wet cloth to keep the body temperature below 120°C. Other parts like the electrical box, tie wraps, and wires must be protected from direct brazing flames.
- Proper Insulation: Field pipes must be fully insulated, ensuring no gaps to prevent condensation dripping. This insulation should reach up to the pipe insulation of the EEV kit.
- Thermistor Fixation: Thermistors must be fixed with insulating aluminum tape for good heat transference and secured with rubber pieces and tie wraps to prevent loosening over time, ensuring accurate temperature measurement. The thermistor wire should be positioned slightly upward to avoid water accumulation.
- Troubleshooting Guide: The manual includes a basic troubleshooting section for issues like the AHU EEV Kit not working, suggesting checks for electrical wiring and piping connections.
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