This document serves as an installer reference guide for the Daikin R32 Split series, specifically for model 4MWXM-A9. It provides comprehensive instructions and safety precautions for the installation, commissioning, and maintenance of the outdoor unit, as well as general information about the system.
Function Description
The Daikin R32 Split series is an air conditioning system designed for both residential and commercial use. This guide focuses on the outdoor unit, which is a critical component of the split system, working in conjunction with indoor units to provide heating and cooling. The system utilizes R32 refrigerant, a mildly flammable material with a Global Warming Potential (GWP) value of 675. The outdoor unit is factory-charged with refrigerant, and additional charging may be required depending on piping length or in cases of relocation or leaks.
Key functions covered in the manual include:
- Refrigerant Piping Installation: Detailed steps for preparing, connecting, and checking refrigerant piping, including flaring pipe ends, using stop valves, and connecting to both indoor units and a DHW tank (if applicable).
- Electrical Installation: Instructions for connecting electrical wiring, including power supply and interconnection cables, ensuring compliance with national regulations and safety standards.
- Configuration: Settings for various operational modes such as standby electricity saving, priority room function, night quiet mode, and heat mode lock.
- Commissioning: Procedures for verifying proper installation, including wiring error checks and trial operations, to ensure the system functions as expected.
- Maintenance and Service: Guidelines for routine maintenance, troubleshooting based on symptoms and LED behavior, and safe disposal procedures.
Important Technical Specifications
Refrigerant:
- Type: R32
- GWP Value: 675
- Maximum Allowable Refrigerant Charge (additional): 2.6 kg
Refrigerant Piping:
- Material: Phosphoric acid deoxidized seamless copper (annealed for flare connections).
- Outer Diameter (Liquid Piping): 4× Ø6.4 mm (1/4")
- Outer Diameter (Gas Piping): 2x Ø9.5 mm (3/8"), 2x Ø12.7 mm (1/2")
- Minimum Thickness (t): ≥0.8 mm for all diameters.
- Insulation Material: Polyethylene foam with a heat transfer rate between 0.041 and 0.052 W/mK and heat resistance of at least 120°C.
- Insulation Inner Diameter: 8~10 mm (Ø6.4 mm pipe), 12~15 mm (Ø9.5 mm pipe), 14~16 mm (Ø12.7 mm pipe).
- Insulation Thickness (t): ≥10 mm (Ø6.4 mm pipe), ≥13 mm (Ø9.5 mm pipe), ≥13 mm (Ø12.7 mm pipe).
- Refrigerant Piping Length to each indoor unit: ≤25 m
- Refrigerant Piping Total Length: ≤50 m
- Height Difference Outdoor-Indoor: ≤15 m (outdoor unit higher than indoor unit), ≤7.5 m (outdoor unit lower than indoor unit).
- Height Difference Indoor-Indoor: ≤7.5 m
- Flare Nut Tightening Torque: 15~17 N·m (Ø6.4 mm), 33~39 N·m (Ø9.5 mm), 50~60 N·m (Ø12.7 mm).
- Stem Cap Tightening Torque: 18~20 N·m (liquid side), 21~28 N·m (gas side).
- Service Port Cap Tightening Torque: 11~14 N·m.
Electrical Specifications:
- Power Supply Voltage: 220~240 V
- Current: 16.3 A
- Phase: 1~
- Frequency: 50 Hz
- Power Supply Cable (Wire Size): 3-core cable, not less than 2.5 mm².
- Interconnection Cable (Wire Size): 4-core cable, minimum 1.5 mm².
- Recommended Circuit Breaker: 20 A
- Earth Leakage Circuit Breaker: Must comply with national wiring regulation.
- Terminal Screw Tightening Torque: 1.2 N·m (M4).
Operational Range:
- Cooling Mode: -10~46°C DB
- Heating Mode: -15~24°C DB
- DHW Operation Range: -15~42°C DB
Usage Features
The R32 Split series offers several features to optimize performance and user experience:
- Standby Electricity Saving Function: This function turns off the power supply to the outdoor unit and activates a standby mode on the indoor unit, reducing energy consumption. It is compatible with specific indoor units (FTXM, FTXJ, FVXM, FTXA, CTXA, CTXM, CVXM, EKHWET).
- Priority Room Function: Allows a designated indoor unit to take priority in operation. When activated, other indoor units may enter standby mode or operate with reduced capabilities, especially during high-power or quiet operation.
- Night Quiet Mode: Reduces the outdoor unit's operational noise during nighttime, though this may slightly reduce cooling capacity.
- Heat Mode Lock: Limits the unit to heat-only operation.
- Wiring Error Check Function: Automatically checks and corrects wiring errors for air-conditioning indoor units, simplifying commissioning.
Maintenance Features
The manual emphasizes safety and proper procedures for maintenance:
- General Maintenance/Inspection Checklist: Available on the Daikin Business Portal, this checklist complements the manual's instructions for routine checks.
- Yearly Maintenance: Recommended at least once a year, including cleaning the heat exchanger to prevent blockages from dust, dirt, and leaves, which can lead to performance degradation.
- Troubleshooting: Provides guidance for diagnosing and resolving problems based on observed symptoms (e.g., unit not heating/cooling, water leakage, electrical leakage, priority room function failure, unit not functioning) and LED behavior on the outdoor unit PCB.
- Refrigerant Leak Detection: After charging, all field-made refrigerant joints must be tested for tightness using a method with a sensitivity of 5 grams refrigerant per year or better.
- Disposal Procedures: Detailed instructions for safely pumping down the system to recover refrigerant before dismantling, ensuring compliance with applicable legislation and specialized treatment facilities.
Safety Precautions:
The document highlights numerous safety warnings and cautions, including:
- Risk of Electrocution: Always turn off power, disconnect power supply for at least 10 minutes, and measure voltage before touching electrical components. Use proper earthing and multicore cables.
- Risk of Burning/Scalding: Avoid touching refrigerant piping or internal parts immediately after operation.
- Risk of Explosion: Do not pierce or burn refrigerant cycle parts. Do not use potential ignition sources when searching for leaks. Ensure no oxygen is in the system before charging.
- Flammable Material: R32 refrigerant is mildly flammable. Ventilate the area in case of leaks and turn off combustible heating devices.
- Physical Injury: Wear personal protective equipment (gloves, safety glasses). Do not touch air inlets or aluminum fins. Handle the outdoor unit carefully to avoid damage.
- Equipment Damage: Use only Daikin-approved accessories and spare parts. Do not reuse flares or piping from previous installations. Do not overcharge refrigerant. Ensure proper drainage to prevent ice accumulation.
- Environmental Protection: Recover refrigerant; do not release it into the environment.
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