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
20
10
7.5
20
RXN30LV1B
20
10
7.5
20
RXN50LV1B
30
10
7.5
20
RXN60LV1B
30
10
7.5
20
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

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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

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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

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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

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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.

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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.

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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
ON
Cool
Dry
Defrost
OFF
DEFROST CYCLE
During defrost
RXN-LV
Compressor
ON
4-way valve
OFF
EXV in operation room
Fixed opening
EXV in operation stop room
-
Outdoor fan
OFF
Indoor fan
OFF

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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.

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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*