Fujitsu ASU36CLX1 Service Manual

The Fujitsu ASU36CLX1 is a 36,000 BTU split-type air conditioning unit with inverter technology, R32 refrigerant, high energy efficiency rating, wireless remote control, auto-swing louvres, quiet operation, anti-mold filter, self-diagnosis function, and multiple operation modes (cooling, heating, dry, fan). Below are key sections for safety precautions, technical specifications, installation procedures, maintenance, troubleshooting, and repair guidelines.

1. Safety Precautions 2. Technical Specifications 3. Installation Procedures 4. Electrical Connections 5. Operation and Controls 6. Maintenance Procedures 7. Troubleshooting Guide 8. Parts Replacement 9. Error Codes 10. Wiring Diagrams 11. Refrigerant Handling

Safety Precautions

Before servicing, ensure proper safety measures are followed to prevent injury and equipment damage.

Hazard Type	Precaution
Electrical Shock	Disconnect power before servicing; use insulated tools
Refrigerant	Wear protective gloves and goggles when handling R32
Heavy Parts	Use proper lifting techniques; two-person lift for outdoor unit
Sharp Edges	Wear cut-resistant gloves during disassembly
High Pressure	Release pressure before opening refrigerant lines
Rotating Parts	Ensure fan is stopped before working near blades

Technical Specifications

Model: ASU36CLX1
Cooling Capacity: 36,000 BTU/h
Heating Capacity: 38,000 BTU/h
Power Supply: 208-230V, 60Hz, 1Ph
Refrigerant: R32
Operating Current: 15.2A (Cooling), 16.8A (Heating)
Sound Level: 45 dB (Indoor), 58 dB (Outdoor)
Dimensions (Indoor): 1150×340×270 mm
Dimensions (Outdoor): 890×750×330 mm
Weight (Indoor): 28 kg
Weight (Outdoor): 68 kg

Installation Procedures

Proper installation ensures optimal performance and longevity.

Select installation location: Ensure adequate clearance (min 50cm around units)
Mount indoor unit: Use mounting plate and level for proper alignment
Install outdoor unit: Use vibration-absorbing pads and secure mounting
Connect refrigerant piping: Flare connections properly; apply torque specified
Connect drain hose: Ensure proper slope for water drainage
Vacuum and charge: Evacuate system to 500 microns; charge with specified R32 amount

WARNING! Only certified technicians should install and service this equipment.

Electrical Connections

Follow electrical codes and manufacturer specifications for all connections.

Connection	Specification
Power Supply	208-230V, 60Hz, dedicated circuit with disconnect
Wire Size	Minimum 10 AWG copper wire
Circuit Breaker	25A time-delay fuse or circuit breaker
Grounding	Proper equipment grounding required
Communication	Shielded cable between indoor and outdoor units

Operation and Controls

Remote control functions and operational modes.

Remote Control: POWER, MODE (Auto/Cool/Dry/Fan/Heat), TEMP ▲▼, FAN SPEED, SWING, TIMER, SLEEP, RESET.

Operation Modes: Auto mode selects cooling or heating based on room temperature. Cooling mode maintains set temperature. Heating mode provides warmth. Dry mode reduces humidity. Fan mode circulates air without cooling/heating.

Maintenance Procedures

Regular maintenance ensures efficiency and prevents breakdowns.

Clean air filters: Remove and wash every 2 weeks; dry completely before reinstalling
Clean outdoor coil: Use soft brush and coil cleaner; rinse with water
Check drain pan: Ensure no blockage; clean if necessary
Inspect electrical connections: Tighten loose terminals; check for corrosion
Verify refrigerant charge: Check superheat and subcooling
Lubricate fan motors: If required by manufacturer specifications

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
Unit not starting	Power supply, remote batteries	Check circuit breaker; replace remote batteries
Poor cooling/heating	Dirty filters, low refrigerant	Clean filters; check refrigerant charge
Water leakage	Clogged drain, improper slope	Clear drain line; adjust slope
Unusual noise	Loose parts, fan obstruction	Tighten mounting; clear fan area
Error code displayed	System fault	Refer to error code section

Parts Replacement

Authorized parts and replacement procedures.

Compressor: Requires recovery of refrigerant; follow specific replacement procedure
Fan motor: Disconnect power; remove fan blade; replace motor
PCB: Note wiring connections; transfer settings from old board
Thermistor: Check resistance values; replace if out of specification
Capacitor: Discharge before handling; match microfarad rating

Error Codes

Code	Description	Action
E1	Room temp sensor fault	Check thermistor resistance
E2	Pipe temp sensor fault	Check pipe thermistor
E3	Pressure sensor fault	Check pressure sensor circuit
E4	Communication error	Check wiring between units
E5	Inverter compressor fault	Check compressor and driver

Wiring Diagrams

Complete electrical schematics for indoor and outdoor units.

Indoor Unit: Power input, fan motor, control board, thermistors, display PCB, remote sensor.

Outdoor Unit: Compressor, fan motor, 4-way valve, pressure sensors, inverter board, contactors.

Inter-unit: Communication wiring between indoor and outdoor control boards.

Refrigerant Handling

Proper procedures for R32 refrigerant management.

Recovery: Use approved recovery machine; recover to recovery cylinder
Charging: Weigh in correct amount; liquid charge into high side
Leak testing: Use electronic leak detector; check all connections
Pressure testing: Use dry nitrogen; do not exceed rated pressure
Evacuation: Achieve 500 microns vacuum; hold for 15 minutes

CAUTION! R32 is mildly flammable; no smoking or open flames during service.