This document provides comprehensive installation instructions for the Flex Multi Split Air Conditioner, covering various indoor unit types including Standard/Artcool Mirror, Ceiling Concealed Duct, and Ceiling Cassette models. It outlines safety precautions, installation procedures, technical specifications, and maintenance guidelines.
Function Description
The Flex Multi Split Air Conditioner system is designed to provide cooling and heating for multiple indoor spaces using a single outdoor unit. It allows for independent control of temperature and fan speed for each connected indoor unit. The system incorporates features such as an Electronic Static Pressure (ESP) function for adjusting fan speed volume, and options for central control addressing.
Important Technical Specifications
- Piping Length and Elevation (Multi Piping Type):
- Outdoor Unit Capacity (Btu/h class): 18k, 24k, 36k
- Max total length of all pipes: 50m (164ft) for 18k, 75m (246ft) for 24k and 36k.
- Max length of each pipe: 25m (82ft) for all capacities.
- Min length of each pipe: 3m (10ft) for all capacities.
- Max Elevation between each indoor unit and outdoor unit (h1): 15m (49ft) for all capacities.
- Max elevation between indoor units (h2): 7.5m (25ft) for all capacities.
- Max Combination of Indoor unit (Btu/h class): 24k for 18k outdoor, 33k for 24k outdoor, 48k for 36k outdoor.
- Pipe Diameter (Gas/Liquid):
- 9k/12k: Gas 9.52mm (3/8 inch), Liquid 6.35mm (1/4 inch).
- 18k: Gas 12.7mm (1/2 inch), Liquid 6.35mm (1/4 inch).
- Standard Pipe Length: 7.5m (25ft) for all capacities.
- Additional Refrigerant: 20g/m (0.22oz/ft) for all capacities.
- Flare Nut Torque Specifications:
- Ø6.35mm (1/4 inch): 1.8~2.5 kgf.m (13~18 lbf·ft)
- Ø9.52mm (3/8 inch): 3.4~4.2 kgf.m (24~30 lbf·ft)
- Ø12.7mm (1/2 inch): 5.5~6.6 kgf.m (40~48 lbf·ft)
- Drain Piping:
- Down-slope: 1/50 to 1/100.
- Outside diameter of drain connection: 32mm (1 1/4 inch).
- Piping material: Polyvinyl chloride pipe inner diameter Ø 25mm (1 inch) and pipe fittings.
- Minimum thickness of insulation for connecting pipe: 19mm (1/32 inch).
- Possible drain-head height: Up to 700mm (27 9/16 inch).
- Thermal insulator for drain pipe: 5mm (3/16 inch) or thicker.
- Electrical Wiring:
- Outdoor Unit Capacity (Btu/h class) | Power source | Fuse or breaker Capacity:
- 18k: 1ø, 208/230V | 15A
- 24k: 1ø, 208/230V | 25A
- 36k: 1ø, 208/230V | 25A
- Heat resistant electrical wiring capable of withstanding temperatures up to 75°C (167°F).
- Outdoor waterproof connection cable rated for at least 300V (e.g., Type SJO-WA).
- Wired remote controller cable length: Max 50m (164ft).
- Refrigerant Charge: Factory charged for evaporator and 7.5m (25ft) line set per indoor line. Adjustment required for line sets shorter or longer than 7.5m (25ft) based on 20g/m (0.22oz/ft) of R-410A.
Usage Features
- Trial Operation: Allows checking the installation status, operating in cooling, strong wind, and comp-on modes for 18 minutes before automatically shutting down.
- Celsius/Fahrenheit Switching: Easily switch temperature units on the remote controller.
- Central-Control Address Setting: Configure network addresses for indoor units when connected to a central controller, allowing for group and individual unit identification.
- ESP Function (Electronic Static Pressure): Adjusts the volume of each fan speed (Low, Medium, Hi) from 1 to 255, providing flexibility for different static pressure requirements. This function is typically set at the factory.
- Wired Remote Controller: Provides comprehensive control over the indoor unit, including temperature settings, fan speed, and operational modes. Offers options for individual or group control, ceiling height selection (low, standard, high), product type selection (cooling only or heat pump), and indoor temperature sensor selection (remote controller, product, or both).
Maintenance Features
- Leak Checking: Detailed procedure for performing leakage tests on all tubing joints and service valves using dry nitrogen gas and soap bubbles. Emphasizes the importance of using a manifold valve and keeping the high-side manifold valve closed.
- Evacuation: Step-by-step instructions for evacuating the tubing and indoor unit using a vacuum pump to remove incondensible gas and moisture. Specifies vacuum pump operation to less than 0.8torr.
- Charging: Guidelines for adjusting refrigerant charge based on actual line set lengths, with a formula provided for calculating additional charge.
- Drainage Check: Procedure for verifying proper drainage by pouring water onto the evaporator and ensuring no leakage.
- Insulation Inspection: Instructions for ensuring proper thermal insulation of refrigerant piping and drain hoses to prevent condensation and water leakage.
- Wiring Inspection: Regular checks for correct wiring connections, ensuring wires are firmly attached and not damaged.
- General Checks: Post-installation checks include air distribution, drain performance, gas leakage, wiring connections, compressor lock-bolt tightness, insulation integrity, and grounding.
- Seaside Applications: Recommendations for installation in coastal areas to prevent corrosion, including avoiding direct exposure to sea wind, installing windbreakers, and periodic cleaning of the heat exchanger.
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