Fujitsu AOU36RLXFZ Service Manual

The Fujitsu AOU36RLXFZ is a high-efficiency split-type air conditioning unit with R410A refrigerant, designed for residential and commercial applications. This service manual provides comprehensive technical information for qualified service technicians, including specifications, installation procedures, troubleshooting, maintenance guidelines, and safety precautions. Below are key sections for technical specifications, installation, operation, maintenance, and troubleshooting.

1. Technical Specifications 2. Safety Precautions 3. Installation Procedures 4. Electrical Connections 5. Operation and Control 6. Maintenance Procedures 7. Troubleshooting Guide 8. Error Code Definitions 9. Parts List and Diagrams 10. Refrigerant Handling

Technical Specifications

Key technical data for Fujitsu AOU36RLXFZ air conditioning unit.

Specification	Description
Model	AOU36RLXFZ
Cooling Capacity	36,000 BTU/h
Heating Capacity	38,000 BTU/h
Power Supply	208-230V, 60Hz
Refrigerant	R410A
Refrigerant Charge	2.8 kg (factory charged)
Operating Current	15.2A (cooling), 16.8A (heating)
Sound Level	48 dB (indoor), 58 dB (outdoor)
Dimensions (Outdoor)	34.6" x 28.7" x 13.8"
Net Weight	121 lbs (outdoor unit)

Safety Precautions

Essential safety guidelines for installation and service.

Disconnect all power sources before servicing.
Wear appropriate PPE including gloves and safety glasses.
Ensure proper ventilation when working with refrigerants.
Verify electrical connections are secure and properly grounded.
Use only authorized replacement parts.

WARNING! High voltage present - risk of electric shock. Only qualified technicians should perform service.

Installation Procedures

Step-by-step installation guidelines.

Select installation location: Ensure adequate clearance (min 20" all sides outdoor unit).
Mount outdoor unit: Use vibration-absorbing pads and secure mounting brackets.
Install refrigerant piping: Connect flare joints with proper torque (35-45 ft-lbs).
Connect drain hose: Ensure proper slope for water drainage.
Evacuate and charge system: Vacuum to 500 microns, charge with R410A.

CAUTION! Do not bend refrigerant pipes sharply; minimum bend radius 4 inches.

Electrical Connections

Wiring and electrical specifications.

Power Supply: 208-230V, 60Hz, 1-phase
Minimum Circuit Ampacity: 25A
Maximum Fuse Size: 35A
Wire Size: 10 AWG minimum
Communication Cable: 2-core shielded cable (18 AWG)

Tip: Verify voltage at installation site before connecting power.

Operation and Control

Operating modes and control functions.

Modes: Cooling, Heating, Dehumidification, Fan Only, Auto

Features: Temperature setting (61°F-88°F), Fan speed control (Auto/Low/Med/High), Timer functions, Sleep mode, Remote control operation, Self-diagnosis system.

Remote Control: POWER, MODE, TEMP ▲/▼, FAN SPEED, TIMER, SWING, RESET

Maintenance Procedures

Routine maintenance schedule and procedures.

Clean air filters: Every 2 weeks during peak usage.
Clean outdoor coil: Annually or as needed.
Check refrigerant charge: Annually using subcooling method.
Inspect electrical connections: Annually for tightness and corrosion.
Clean drain pan and line: Every 6 months.

WARNING! Always disconnect power before performing maintenance.

Troubleshooting Guide

Common issues and solutions.

Symptom	Possible Cause	Corrective Action
Unit not starting	Power supply, breaker, remote	Check power, reset 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 components, clear obstructions
Error code display	System fault	Refer to error code definitions section

Error Code Definitions

Self-diagnosis error codes and meanings.

Error Code	Description	Action
E0	Protection device activated	Check for obstructions, reset
E1	PCB communication error	Check wiring connections
E3	High pressure protection	Check condenser, refrigerant charge
E4	Low pressure protection	Check for leaks, refrigerant level
E5	Compressor overload	Check voltage, compressor condition

Parts List and Diagrams

Major components and replacement parts.

Compressor: Rotary type, 3-phase
Fan Motor: DC brushless, outdoor unit
PCB Assembly: Main control board
Heat Exchanger: Copper tube/aluminum fin
Expansion Valve: Electronic type
Capacitors: Run capacitor 35μF

Note: Use only genuine Fujitsu replacement parts.

Refrigerant Handling

R410A refrigerant procedures and precautions.

Recovery: Use approved recovery machine and cylinders.
Charging: Charge as liquid into high side only.
Pressure: High pressure operation - use appropriate gauges.
Leak testing: Use electronic leak detector or bubble solution.
Disposal: Recover refrigerant, do not vent to atmosphere.

CAUTION! R410A operates at higher pressures than R22 - use dedicated equipment.