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Fujitsu Airstage VR-II Series User Manual

Fujitsu Airstage VR-II Series
246 pages
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SERVICE MANUAL
208/230V 60Hz

Table of Contents

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Fujitsu Airstage VR-II Series Specifications

General IconGeneral
Cooling CapacityVaries by model
Heating CapacityVaries by model
Energy Efficiency Ratio (EER)Varies by model
Coefficient of Performance (COP)Varies by model
Indoor Unit Dimensions (WxHxD)Varies by model
Outdoor Unit Dimensions (WxHxD)Varies by model
Indoor Unit WeightVaries by model
Outdoor Unit WeightVaries by model
Airflow DirectionAuto, Manual
Filter TypeWashable
Remote ControlYes
Wi-Fi ControlOptional

Summary

1. TEST RUN

1-1 EXECUTION PROCEDURE AND EXECUTION PRECAUTIONS

Outlines critical steps and precautions before and during system execution for proper installation.

1-2 CHECK ITEMS BEFORE POWER ON

Details essential checks and inspections required for the system before applying power to ensure safety and functionality.

1-3 CHECK ITEMS AFTER POWER ON

Lists critical checks and inspections to be performed on the system after power has been applied.

1-4 TEST RUN OPERATION

Explains the procedure for conducting a test run of the system using the outdoor unit's PC board.

1-5 TEST RUN CONTROL

Details how to control and manage the test run operation, including signals from various controllers.

1-6 FIELD SETTING / FUNCTION SETTING FOR OUTDOOR UNIT

Provides a list of settings and functions that can be configured for the outdoor unit via field adjustments.

1-7 FIELD SETTING / FUNCTION SETTING FOR INDOOR UNIT

Lists configurable field settings and functions for various types of indoor units, managed via remote controller.

1-8 FIELD SETTING / FUNCTION SETTING FOR OUTDOOR AIR UNIT

Details field settings and functions specific to the outdoor air unit, including temperature triggers and auto restart.

2. OUTDOOR UNIT OPERATION CONTROL

2-1 REFRIGERANT CIRCUIT

Illustrates the refrigerant flow path and lists all components within the outdoor unit's refrigerant circuit.

2-2 INPUT / OUTPUT LIST

Provides a comprehensive list of all input signals and output controls for the system, detailing their function and range.

2-3 HEAT RECOVERY OPERATION CONTROLLING

Explains how heat recovery operation is controlled, including mode selection and heat balance management.

2-4 COMPRESSOR OPERATION

Details the conditions and modes under which the compressor operates and stops, including protection features.

2-5 HEAT EXCHANGER CAPACITY CONTROL

Describes how heat exchanger capacity is managed through operation modes, fan control, and EEV adjustments.

2-6 FAN CONTROL

Explains the fan speed control logic for cooling and heating operations, including conditions affecting fan speed.

2-7 EXPANSION VALVE CONTROL

Details the control range and operation of the electronic expansion valves (EEVs) in different modes.

2-8 SPECIAL OPERATION

Covers special operational modes like Oil Recovery, Pre-heat, Defrost, Low noise, and Snow Falling protection.

2-9 PROTECTIVE FUNCTION

Lists various protective functions for the system, detailing detected devices, conditions, and operations for each protection.

3. INDOOR UNIT OPERATION

3-1 FAN CONTROL

Explains fan speed settings and the "AUTO" position logic for cooling, heating, and dry operations.

3-2 MASTER CONTROL

Details the master control logic for different indoor unit connectable types, covering mode settings, cool/dry/heat modes, and stop modes.

3-3 LOUVER CONTROL

Provides instructions for adjusting vertical and horizontal airflow direction and swing operations using the remote controller.

3-4 ELECTRONIC EXPANSION VALVE CONTROL

Explains the initialization, operation control, and special control logic for electronic expansion valves.

3-5 DRAIN PUMP OPERATION

Describes the operation of the drain pump, including its start, continuous operation, and response to float switch signals.

3-6 FUNCTION

Covers essential unit functions such as Auto Restart, Freeze Prevention, Oil Recovery/Defrost Operation, and Outdoor temperature protection.

3-7 RB UNIT COMPONENT

Details the components and layout of the RB unit, including solenoid coil positions, valve positions, and PCB layouts.

4. TROUBLE SHOOTING

4-1 NORMAL OPERATION

Explains the normal operation indicators and patterns for the indoor unit display, including LED and 7-segment displays.

4-2 ABNORMAL OPERATION

Details how error codes are displayed, including subsection and specific error codes, and troubleshooting procedures for communication errors.

4-3 SERVICE INFORMATION

Provides basic troubleshooting steps for network communication abnormalities, including checking terminal resistance and using the address checker.

4-4 SERVICE INFORMATION

Explains the backup operation procedure for replacing a compressor or when a unit is defective.

4-5 SERVICE PARTS INFORMATION

Offers diagnostic methods for compressor issues and lists relevant service parts for troubleshooting.

5. APPENDING DATA (UNIT)

5-1 REFRIGERANT CIRCUIT

Presents the refrigerant circuit diagrams for different outdoor unit models, showing component connections and flow paths.

5-2 WIRING DIAGRAM

Provides detailed wiring diagrams for various indoor unit types, including compact cassette, slim duct, and wall-mounted units.

6. DISASSEMBLY PROCESS

6.1 Indoor Unit

Details the procedures for removing and installing the transmission PCB on indoor units, including DIP-SW settings.

6.2 Outdoor Unit

Outlines the steps for accessing and removing external panels and covers of the outdoor unit for servicing.

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