Fujitsu ASU18RLF Installation Manual

The Fujitsu ASU18RLF is a high-efficiency split-type air conditioning unit with 18,000 BTU cooling capacity, R-410A refrigerant, inverter technology for energy savings, wireless remote control, auto-swing louvres, sleep mode, timer functions, and multiple fan speeds. Designed for residential and light commercial use with easy installation and maintenance features. Below are key sections for safety, installation procedures, electrical connections, commissioning, and troubleshooting.

Safety Precautions

Always follow safety guidelines to prevent injury and equipment damage.

Unit Specifications

• Model: ASU18RLF
• Cooling Capacity: 18,000 BTU/h
• Power Supply: 208-230V, 60Hz
• Refrigerant: R-410A
• Operating Range: Cooling: 14°F to 115°F
• Indoor Unit Dimensions: 31.5" x 11.8" x 8.7"
• Outdoor Unit Dimensions: 31.9" x 23.6" x 13.8"
• Max Piping Length: 82 feet
• Max Height Difference: 49 feet

Installation Tools Required

Essential tools for proper installation:

1. Flaring tool set
2. Torque wrench
3. Vacuum pump
4. Manifold gauge set
5. Pipe cutter
6. Leak detector
7. Multimeter
8. Level
9. Drill with hole saw

NOTE: Use only tools designed for R-410A refrigerant systems.

Indoor Unit Installation

Proper indoor unit placement ensures optimal performance.

1. Select location: Minimum 7 feet from floor, away from heat sources
2. Mount mounting plate: Use level to ensure proper alignment
3. Create wall opening: 2.5-inch diameter hole for piping
4. Route piping and cables: Through wall opening to outdoor unit
5. Hang indoor unit: Secure onto mounting plate

WARNING! Ensure wall can support unit weight (approx. 20 lbs).

Outdoor Unit Installation

Outdoor unit requires stable foundation and proper clearance.

1. Select location: Minimum 12 inches clearance on all sides
2. Prepare foundation: Concrete pad or vibration-absorbing pads
3. Position unit: Ensure level installation
4. Secure unit: Use anchor bolts if required
5. Connect piping: Follow refrigerant piping guidelines

CAUTION! Protect unit from direct sunlight and snow accumulation.

Refrigerant Piping

Proper piping installation is critical for system performance.

1. Cut pipes to required length
2. Deburr and clean pipe ends
3. Flare connections: 45-degree angle, no scratches
4. Apply refrigerant oil to flare nuts
5. Connect pipes with proper torque

Electrical Connections

Follow electrical codes and manufacturer specifications.

1. Disconnect all power sources
2. Connect indoor unit: L1, L2, Ground
3. Connect outdoor unit: L1, L2, Ground
4. Connect communication cable between units
5. Secure all connections with proper terminals

WARNING! Use copper conductors only. Follow local electrical codes.

Drainage System

Proper drainage prevents water damage and ensures efficient operation.

1. Connect drain hose to indoor unit
2. Route hose with downward slope (minimum 1/4 inch per foot)
3. Secure connections with hose clamps
4. Test drainage with water
5. Insulate drain line in unconditioned spaces

Vacuum and Leak Testing

Essential steps to ensure system integrity.

1. Connect vacuum pump to service ports
2. Evacuate system to 500 microns or less
3. Hold vacuum for 15 minutes (no rise)
4. Charge with nitrogen for pressure test (550 PSI)
5. Check all connections with leak detector
6. Release nitrogen and final vacuum

Commissioning

Final steps to activate and test the system.

1. Release refrigerant by opening service valves
2. Check refrigerant charge (weigh-in method)
3. Power on system
4. Test cooling operation
5. Verify remote control functions
6. Check temperature differential (14-22°F)
7. Record installation data

Troubleshooting

Service Contact: Fujitsu Technical Support: 1-800-831-8821

Warranty: 7-year compressor, 5-year parts warranty