Daikin FTXN-LV Programming manual

TS13-01

Inverter Split

Wall mounted Type L-Series

Heat pump:

Indoor unit: FTXN-LV

Outdoor unit: RXN-LV

Troubleshooting

Manual

TS13-01 Troubleshooting manual 2

Inverter Air conditioning technology is today’s solution for superior comfort, higher efficiency and better energy

saving. Daikin Inverter included Residential, Light Commercial and Multi Split Unit.

INVERTER Y SINGLE SPLIT (Residential, Light Commercial)

i) INDOORS

ii) OUTDOORS

1.1 INVERTER Y SINGLE SPLIT

Residential (FTXN-LV & RXN-LV):

- High Quality & Efficiency Daikin DC Inverter compressor

- High Performance Daikin Inverter Controller

- 5-speed Step-less Fan operation

- BioPro IAQ.

- New Inverter-only Remote Control

Piping Length & Elevation

Model

Max. total

piping length

(m)

Max. height

difference

(m)

Pre-charge for

up to piping

length (m)

Additional

charge

(g/m)

RXN25LV1B

7.5

RXN30LV1B

7.5

RXN50LV1B

7.5

RXN60LV1B

7.5

Terminal Block for outdoor:

- Equipped with 7-segment display to improve serviceability. (Exclude for RXN25/30LV1B)

- To retrieve error code & running parameters.

1.0 Introduction

TS13-01 Troubleshooting manual 3

Disable Auto Random Restart function:

Series I Series II

To disable the auto random restart function, kindly cut off the jumper J_AUTO as highlighted in attachment.

Please be informed that after disable auto random restart, unit is not able to restart with last state memory after

power resume from failure. Unit will revert to default setting as below:

Default setting

Unit: Off

Temperature: 24°C

Fan speed: High

Mode: Cooling

TS13-01 Troubleshooting manual 4

INDOOR BASIC FUNCTIONS

Residential and Light Commercial

-The system has 5 operating modes. The mode selection is done from indoor using handset.

-The operating modes are:

•Cool

•Heat

•Fan

•Auto

•Dry

Cool Mode:

-When Tr ≥ Ts - 1.5°C

•Comp, Indoor Fan and Outdoor Fan ON.

-When Tr ≤ Ts - 2°C

•Compressor and Outdoor Fan OFF.

•Indoor Fan remains ON.

Tr = Room Temperature

Ts = Set Temperature

When cooling load is too small and the room temperature still falling below compressor cut off point,

compressor will stop.

2.0 Algorithm and Control

TS13-01 Troubleshooting manual 5

Heat Mode:

-When Ts > Tr - 1.0°C

•Comp, ID Fan and OD Fan ON.

-When Tr ≥ Ts + 1.5°C

•Compressor and Outdoor Fan OFF.

•Indoor Fan off if indoor coil ≤20°C.

Tr = Room Temperature

Ts = Set Temperature

When heating load is too small, and the room temperature still rising above compressor cut off point, compressor

will stop.

FAN MODE

-Only High, Medium and Low fan speeds are allowed.

-When changing cool mode to fan mode, the compressor will stop and OD fan stops based on fan OFF

control.

-Compressor only ON if the minimum stop time is > 3 minutes and the user change back to cool mode.

-Fan speed will maintain same as during fan mode.

AUTO MODE

-For heat pump only

-Mode switching point:

•Heating Cooling

Tr ≥ Ts + 2.5

•Cooling Heating

Tr ≤ Ts – 2.5

-During initial operation

•Cooling operation: Tr > Ts

•Heating operation: Tr < Ts

TS13-01 Troubleshooting manual 6

ID-OD COMMUNICATION

-Master by outdoor unit.

-Indoor controller board will transmit signal to outdoor controller board every 0.5s. Outdoor unit will

response to indoor once the valid data is received.

-If the data communication line between indoor and outdoor disrupted for 15s continuously, compressor

will stop, OD fan stop with fan OFF timer. ID LED blinks error.

-If the communication resumes within 15s, error code is clear and compressor restarts after 3 minutes.

-If the communication does not resume after 15s, unit unable to restart and the error keep blinking.

TS13-01 Troubleshooting manual 7

THERMISTORS IN RXN-LV

FUNCTIONS OF THERMISTOR

Thermistor

Functions

Discharge pipe

Used for discharge superheat (SH) & EXV control. Also used for crankcase

heater/ preheating control in Series 2 model.

Outdoor coil

Used for defrost control. Also used for inverter current protection control in

Series II.

Outdoor air

Used for defrost & outdoor fan speed control. Also used for PMV, overall

current protection & preheating operation control.

Heat sink

Used for capturing heat sink temperature.

Suction pipe

Used for EXV (SH) & suction pipe SH protection control in heating.

Gas pipe

Used for gas pipe isothermal control in cooling. EXV opening is controlled so

that accurate cooling capacity is achieved in each room.

Liquid pipe

Used for sub-cooling control in heating. Actual sub-cooling will be calculated

with liquid pipe & max. heat exchanger temperature among all rooms. EXV

opening is then adjusted to reach the target sub-cooling.

TS13-01 Troubleshooting manual 8

MINIMUM RUN CONTROL

To prevent frequent compressor ON/OFF & to allow pressure equalization

•The compressor will be on 3 minutes stand-by after turning OFF before it is allowed to turn ON.

•OD fan OFF delay to improve pressure equalization & to prevent refrigerant from entering into

evaporator.

AUTO RESTART

-Factory pre-set.

-Allow unit to automatically resume the same operating mode it was in before a power failure.

4-WAY VALVE CONTROL

-Change over switching is only carried out during operation.

-OFF delayed is applied when the coil switches from ON to OFF, i.e. A5LCY Series I - 45 second,

Operating mode

4-way valve is

Heat, except for defrost

Cool

Dry

Defrost

OFF

DEFROST CYCLE

During defrost

RXN-LV

Compressor

4-way valve

OFF

EXV in operation room

Fixed opening

EXV in operation stop room

Outdoor fan

OFF

Indoor fan

OFF

TS13-01 Troubleshooting manual 9

FTXN-LV and RXN-LV:

DEFROST CONTROL

-Condition for entering defrost

•Compressor minimum run time –6 minutes OR

•Compressor accumulated run time of 45 minutes if OD coil < 3C.

•When OD coil < 0C AND OD coil < OD air - 10C.

-Condition for terminating defrost

•OD coil > 12C or

•Total defrost timer of 650 seconds.

OUTDOOR FAN CONTROL

-Determine from

•Compressor target rotation: higher fan speed with higher rotation.

•Outdoor air temperature.

-Cool mode: Higher fan speed with higher outdoor air temperature.

-Heat mode: Higher fan speed with lower outdoor air temperature.

-When compressor stops, fan OFF delay 30 seconds is carried out

INDOOR COIL FREEZE PREVENTION

-Only available in cooling mode.

-When the indoor coil temperature < 2°C, the compressor starts to drop the frequency.

-This protection will cut in when:

•Indoor coil temperature < 0°C for more than 180s. Compressor will stop, OD fan stop after 30s

and indoor fan can only run at lowest fan speed.

-The unit can only be restarted after 3 minutes.

-When the indoor coil temperature > 13°C, the compressor frequency will be reset based on the OD

ambient, room and set temperature.

TS13-01 Troubleshooting manual 10

ROTATION REGULATING FUNCTIONS

* Defrost control for heat pump model only

STARTING ROTATION

STARTING CONTROL

-To avoid excessive oil discharge from compressor or to promote oil lubrication during startup.

-To prevent liquid flood back to the compressor.

-To limit starting current.

-When compressor starts to rotate from OFF to ON, compressor rotation is set to run gradually to each

upper limit at a specific timer setting.

Model

Max. f

RXN25LV1B

68 Hz

RXN35LV1B

74 Hz

RXN50LV1B

90 Hz

Upper limit rotation

Limit Rotation

Lower limit rotation

Target Rotation

Command Rotation

Starting Rotation

∆T

Defrost*

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