MODELSCeiling-mounted Cassette type (Multi flow model)FXFQ12MVJUFXFQ18MVJUFXFQ24MVJUFXFQ30MVJUFXFQ36MVJUSYSTEM Inverter Air ConditionersOPERATION MANUALRead these instructions carefully before installation.Keep this manual in a handy place for future reference.This manual should be left with the equipment owner.

operation manual

safety considerations

Daikin FXFQ12MVJU Operation Manual

safety cautions

cautions regarding products after repair

inspection after repair

using icons

Part 1 General Information

Model Names of Indoor/Outdoor Units

External Appearance

Model Selection

Part 2 Specifications

Specifications

ceiling suspended type

wall mounted type

floor standing type

Part 3 Refrigerant Circuit

Refrigerant Circuit

Functional Parts Layout

Refrigerant Flow for Each Operation Mode

heating operation

Part 4 Function

Operation Mode

Basic Control

Compressor PI Control

Electronic Expansion Valve PI Control

Cooling Operation Fan Control

Special Control

Oil Return Operation

defrosting operation

pump-down residual operation

Restart Standby

Stopping Operation

Startup

Protection Control

Low Pressure Protection Control

Discharge Pipe Protection Control

Inverter Protection Control

STD Compressor Overload Protection

Other Control

Emergency Operation

Demand Operation

Outline of Control (Indoor Unit)

Thermostat Sensor in Remote Controller

Freeze Prevention

Part 5 Test Operation

Test Operation

check operation

Operation When Power is Turned On

Outdoor Unit PC Board Layout

Field Setting

simplified remote controller

detailed explanation of setting modes

contents of control modes

Field Setting from Outdoor Unit

setting of demand operation

test operation

additional refrigerant charge total flow

Part 6 Troubleshooting

Troubleshooting by Remote Controller

Self-diagnosis by Wired Remote Controller

Self-diagnosis by Wireless Remote Controller

Operation of The Remote Controller's Inspection Test Operation Button

Remote Controller Service Mode

Remote Controller Self-Diagnosis Function

malfunction code indication by outdoor unit pcb

Troubleshooting by Indication on the Remote Controller

PC Board Defect

troubleshooting

Fan Motor (M1F) Lock, Overload

Malfunction of Swing Flap Motor (MA)

Drain Level above Limit

remote controller

actuation of high pressure switch

actuation of low pressure sensor

E5" Compressor Motor Lock

E6" Compressor Motor Overcurrent/Lock

abnormal discharge pipe temperature

F6" Refrigerant Overcharged

H7" Abnormal Outdoor Fan Motor Signal

malfunction of thermistor (r2t) for

malfunction of thermistor (r4t) for

Thermistor (R6T)

J8"Malfunction of Oil Equalizing Pipe Thermistor (R7T)

J9" Malfunction of Sub-Cooling Gas Pipe Thermistor (R5T)

malfunction of suction pipe pressure sensor

temperature rise

inverter compressor abnormal

inverter current abnormal

inverter start up error

temperature rise sensor

reverse phase, open phase

instantaneous failure

check operation not executed

and Outdoor Units

and Outdoor Units/Indoor Units and Remote Controller

UC" Address Duplication of Central Remote Controller

and Indoor Unit

FXFQ12MVJU

Indoor Units

BS Units

BSVQ36, 60M

front view

Function General

Cooling / Heating Operation

Defrosting Operation

Pressure Equalizing Control

Pump-down Residual Operation

setting by pushbutton switches

image of operation in the case of a

Operation of the Remote Controller's Inspection Test Operation Button

Fan motor lock, overload

malfunction of moving part of electronic

drain level above limit

malfunction of thermistor (r1t) for

pc board defect

E5" Compressor Motor Lock (INV Compressor)

E6" Compressor Motor Overcurrent/Lock (STD Compressor)

malfunction of discharge pipe

outdoor unit heat exchanger

J7" Malfunction of Receiver Outlet Liquid Pipe Thermistor (R6T)

J8" Malfunction of Oil Equalizing Pipe Thermistor (R7T)

J9" Malfunction of Sub-cooling Heat Exchanger Gas Pipe Thermistor (R5T)

inverter over-ripple protection

U1" Outdoor Unit: Reverse Phase, Open Phase

Instantaneous Failure

Inverter Series

Features

Design flexibility

Easy installation

Energy saving

Enhanced usability

Outside unit lineup

Model Names

Outside Units

Combination of Outside Units

Capacity Range

in case of heat recovery connection

Function

Normal Operation

BS unit & Indoor unit operation mode detail

Stop

Standby

Startup Control

Heating Start-up Control

Normal Control

unit installation

Electronic Expansion Valve Control

Heat Exchange Mode in Heating Operation or Simultaneous Cooling / Heating Operation

Cooling Fan Control

Special Operation

Oil Return Operation of Water Heat Exchanger

Pump-down Residual Operation Control

Refrigerant Drift Prevention

Louver Control for Preventing Ceiling Dirt

Thermostat Control While in Normal Operation

Hot Start Control (In Heating Operation Only)

Heater Control

List of Swing Flap Operations

Outside Unit PC Board Layout

external on/off input

brc7c type

Field Setting from Outside Unit

emergency operation

CJ" Indoor Unit Remote Controller

Actuation of High Pressure Switch

Actuation of Low Pressure Sensor

Abnormal Discharge Pipe Temperature

HJ" Malfunction of Water system

ceiling mounted cassette type

Dimensions

Piping Diagrams

Wiring Diagrams

Electric Characteristics

Air Velocity and Temperature Distributions

Sound Levels

Installation

before installation

selecting installation site

preparations before installation

indoor unit installation

refrigerant piping work

drain piping work

electric wiring work

field setting

Accessories

installation manual

SAFETY CONSIDERATIONS

BEFORE INSTALLATION

SELECTING INSTALLATION SITE

PREPARATIONS BEFORE INSTALLATION

INDOOR UNIT INSTALLATION

REFRIGERANT PIPING WORK

DRAIN PIPING WORK

ELECTRIC WIRING WORK

FIELD SETTING

INSTALLATION OF THE DECORATION PANEL

FXFQ18MVJU

FXFQ24MVJU


Contents operation manual safety considerations	MODELSCeiling-mounted Cassette type (Multi flow model)FXFQ12MVJUFXFQ18MVJUFXFQ24MVJUFXFQ30MVJUFXFQ36MVJUSYSTEM Inverter Air ConditionersOPERATION MANUALRead these instructions carefully before installation.Keep this manual in a handy place for future reference.This manual should be left with the equipment owner. Next / 7