Daikin FTK(X)M-P Series User manual

Service
Manual
Inverter Pair
Wall Mounted Type
FTK(X)M-P Series
SiMT041509E
[Applied Models]
zInverter Pair : Heat Pump

SiMT041509E
iTable of Contents
Inverter Pair
Wall Mounted Type
FTK(X)M-P Series
zCooling Only
Indoor Unit
FTKM18PVMK
FTKM24PVMK
FTKM28PVMK
Outdoor Unit
RKM18PVMK
RKM24PVMK
RKM28PVMK
zHeat Pump
Indoor Unit
FTXM18PVMK
FTXM24PVMK
FTXM28PVMK
Outdoor Unit
RXM18PVMK
RXM24PVMK
RXM28PVMK

SiMT041509E
Table of Contents ii
1. Safety Cautions.......................................................................................v
1.1 Warnings and Cautions Regarding Safety of Workers.............................v
1.2 Warnings and Cautions Regarding Safety of Users................................ xi
2. Used Icons ........................................................................................... xiv
Part 1 List of Functions ................................................................ 1
1. Functions.................................................................................................2
Part 2 Specifications .................................................................... 3
1. Specifications ..........................................................................................4
Part 3 Printed Circuit Board Connector Wiring Diagram ............. 8
1. Indoor Unit...............................................................................................9
2. Outdoor Unit..........................................................................................11
Part 4 Function and Control........................................................ 12
1. Main Functions......................................................................................13
1.1 Temperature Control ..............................................................................13
1.2 Frequency Principle................................................................................13
1.3 Airflow Direction Control.........................................................................15
1.4 Fan Speed Control for Indoor Unit .........................................................16
1.5 Program Dry Operation ..........................................................................17
1.6 Automatic Operation...............................................................................18
1.7 Thermostat Control.................................................................................19
1.8 NIGHT SET Mode ..................................................................................20
1.9 ECONO Operation .................................................................................20
1.10 INTELLIGENT EYE Operation ...............................................................21
1.11 Inverter POWERFUL Operation .............................................................22
1.12 Clock Setting ..........................................................................................23
1.13 WEEKLY TIMER Operation ...................................................................24
1.14 Other Functions......................................................................................30
2. Function of Thermistor ..........................................................................31
3. Control Specification .............................................................................32
3.1 Mode Hierarchy ......................................................................................32
3.2 Frequency Control..................................................................................33
3.3 Controls at Mode Changing / Start-up....................................................35
3.4 Discharge Pipe Temperature Control.....................................................36
3.5 Input Current Control..............................................................................37
3.6 Freeze-up Protection Control .................................................................38
3.7 Heating Peak-cut Control .......................................................................38
3.8 Outdoor Fan Control...............................................................................39
3.9 Liquid Compression Protection Function................................................39
3.10 Defrost Control .......................................................................................40
3.11 Electronic Expansion Valve Control .......................................................41
3.12 Discharge Pipe Thermistor Disconnection Control.................................43
3.13 Malfunctions ...........................................................................................43

SiMT041509E
iii Table of Contents
Part 5 Remote Controller ............................................................ 44
1. Remote Controller .................................................................................45
Part 6 Service Diagnosis............................................................. 47
1. General Problem Symptoms and Check Items.....................................48
2. Troubleshooting with LED .....................................................................49
2.1 Indoor Unit..............................................................................................49
2.2 Outdoor Unit ...........................................................................................49
3. Service Diagnosis .................................................................................50
4. Troubleshooting ....................................................................................53
4.1 Error Codes and Description ..................................................................53
4.2 Indoor Unit PCB Abnormality .................................................................54
4.3 Freeze-up Protection Control / Heating Peak-cut Control ......................55
4.4 Fan Motor (DC Motor) or Related Abnormality.......................................56
4.5 Thermistor or Related Abnormality (Indoor Unit)....................................58
4.6 Low-voltage Detection or Over-voltage Detection..................................59
4.7 Signal Transmission Error (Between Indoor Unit and Outdoor Unit)......61
4.8 Unspecified Voltage (Between Indoor Unit and Outdoor Unit) ...............63
4.9 Outdoor Unit PCB Abnormality...............................................................64
4.10 Actuation of High Pressure Switch .........................................................65
4.11 OL Activation (Compressor Overload) ...................................................66
4.12 Compressor Lock ...................................................................................68
4.13 DC Fan Lock ..........................................................................................69
4.14 Input Overcurrent Detection ...................................................................70
4.15 Four Way Valve Abnormality..................................................................71
4.16 Discharge Pipe Temperature Control.....................................................73
4.17 Compressor System Sensor Abnormality ..............................................74
4.18 Position Sensor Abnormality ..................................................................75
4.19 Thermistor or Related Abnormality (Outdoor Unit).................................77
4.20 Electrical Box Temperature Rise............................................................79
4.21 Radiation Fin Temperature Rise ............................................................80
4.22 Output Overcurrent Detection ................................................................81
5. Check ....................................................................................................83
5.1 Thermistor Resistance Check ................................................................83
5.2 Indoor Fan Motor Connector Output Check ...........................................84
5.3 Power Supply Waveforms Check...........................................................84
5.4 Electronic Expansion Valve Check.........................................................84
5.5 Four Way Valve Performance Check .....................................................85
5.6 Inverter Unit Refrigerant System Check.................................................85
5.7 Inverter Analyzer Check .........................................................................86
5.8 Rotation Pulse Check on the Outdoor Unit PCB ....................................87
5.9 Installation Condition Check...................................................................88
5.10 Discharge Pressure Check.....................................................................88
5.11 Outdoor Fan System Check ...................................................................89
5.12 Main Circuit Short Check........................................................................89
5.13 Power Module Check .............................................................................90
Part 7 Trial Operation and Field Settings................................... 91
1. Tips for Servicing ..................................................................................92
1.1 Pump Down Operation ...........................................................................92

SiMT041509E
Table of Contents iv
1.2 Forced Cooling Operation ......................................................................92
2. Trial Operation ......................................................................................93
3. Field Settings ........................................................................................94
3.1 When 2 Units are Installed in 1 Room....................................................94
3.2 Jumper Settings .....................................................................................94
4. Silicon Grease on Power Transistor / Diode Bridge..............................95
Part 8 Appendix........................................................................... 96
1. Piping Diagrams....................................................................................97
1.1 Indoor Unit..............................................................................................97
1.2 Outdoor Unit ...........................................................................................98
2. Wiring Diagrams..................................................................................101
2.1 Indoor Unit............................................................................................101
2.2 Outdoor Unit .........................................................................................102

Safety Cautions SiMT041509E
v
1. Safety Cautions
Be sure to read the following safety cautions before conducting repair work.
After the repair work is complete, be sure to conduct a test operation to ensure that the
equipment operates normally, and explain the cautions for operating the product to the
customer.
Caution Items The caution items are classified into Warning and Caution. The Warning items are
especially important since they can lead to death or serious injury if they are not followed
closely. The Caution items can also lead to serious accidents under some conditions if they
are not followed. Therefore, be sure to observe all the safety caution items described below.
Pictograms This symbol indicates the item for which caution must be exercised.
The pictogram shows the item to which attention must be paid.
This symbol indicates the prohibited action.
The prohibited item or action is shown in the illustration or near the symbol.
This symbol indicates the action that must be taken, or the instruction.
The instruction is shown in the illustration or near the symbol.
1.1 Warnings and Cautions Regarding Safety of Workers
Warning
Do not store the equipment in a room with successive fire sources (e.g.,
naked flame, gas appliance, electric heater).
Be sure to disconnect the power cable plug from the plug socket before
disassembling the equipment for repair.
Working on the equipment that is connected to the power supply may cause an
electrical shock.
If it is necessary to supply power to the equipment to conduct the repair or
inspecting the circuits, do not touch any electrically charged sections of the
equipment.
If the refrigerant gas is discharged during the repair work, do not touch
the discharged refrigerant gas.
The refrigerant gas may cause frostbite.
When disconnecting the suction or discharge pipe of the compressor at
the welded section, evacuate the refrigerant gas completely at a well-
ventilated place first.
If there is gas remaining inside the compressor, the refrigerant gas or
refrigerating machine oil discharges when the pipe is disconnected, and it may
cause injury.
If the refrigerant gas leaks during the repair work, ventilate the area.
The refrigerant gas may generate toxic gases when it contacts flames.
Be sure to discharge the capacitor completely before conducting repair
work.
The step-up capacitor supplies high-voltage electricity to the electrical
components of the outdoor unit.
A charged capacitor may cause an electrical shock.

SiMT041509E Safety Cautions
vi
Do not start or stop the air conditioner operation by plugging or
unplugging the power cable plug.
Plugging or unplugging the power cable plug to operate the equipment may
cause an electrical shock or fire.
Be sure to wear a safety helmet, gloves, and a safety belt when working
at a high place (more than 2 m).
Insufficient safety measures may cause a fall accident.
In case of R-32 / R-410A refrigerant models, be sure to use pipes, flare
nuts and tools for the exclusive use of the R-32 / R-410A refrigerant.
The use of materials for R-22 refrigerant models may cause a serious accident
such as a damage of refrigerant cycle as well as an equipment failure.
Do not mix air or gas other than the specified refrigerant (R-32 / R-410A /
R-22) in the refrigerant system.
If air enters the refrigerating system, an excessively high pressure results,
causing equipment damage and injury.
Warning
Caution
Do not repair the electrical components with wet hands.
Working on the equipment with wet hands may cause an electrical shock.
Do not clean the air conditioner by splashing water.
Washing the unit with water may cause an electrical shock.
Be sure to provide the earth / grounding when repairing the equipment in
a humid or wet place, to avoid electrical shocks.
Be sure to turn off the power switch and unplug the power cable when
cleaning the equipment.
The internal fan rotates at a high speed, and may cause injury.
Be sure to conduct repair work with appropriate tools.
The use of inappropriate tools may cause injury.
Be sure to check that the refrigerating cycle section has cooled down
enough before conducting repair work.
Working on the unit when the refrigerating cycle section is hot may cause
burns.

Safety Cautions SiMT041509E
vii
Checking the area
Before beginning work, conduct safety checks to minimise the risk of ignition. When repairing
the refrigerating system, take the following precautions before work.
Work procedure
Work shall be conducted under a controlled procedure so as to minimise the risk of working in
the presence of R-32 or vapour.
General working area
All maintenance staff and others working in the local area shall be instructed on the nature of
work being carried out.
Work in confined spaces shall be avoided.
The area around the workspace shall be sectioned off. Ensure that the conditions within the
area have been made safe by control of flammable materials.
Checking for presence of refrigerant
The working area shall be checked with an appropriate refrigerant detector before and during
work, to ensure the technician is aware of potentially flammable atmospheres.
Ensure that the leak detection equipment being used is suitable for use with R-32, i.e. non-
sparking, adequately sealed or intrinsically safe.
Fire extinguishing equipment
If any hot work is to be conducted on the refrigeration equipment or any associated parts,
appropriate fire extinguishing equipment shall be made available at hand. Prepare a dry powder
or CO2fire extinguisher adjacent to the working area.
No ignition sources
During work on a refrigeration system which involves exposing any piping work that contains or
has contained R-32, any sources of ignition shall not be used in a manner that may lead to the
risk of fire or explosion. All possible ignition sources, including cigarette smoking, should be
kept at a safe distance from the site of installation, repairing, or removing space. Before starting
work, the area around the equipment shall be examined to make sure that there are no
flammable hazard or ignition risks. No Smoking signs shall be displayed.
Ventilated area
Ensure that the working area is open or that it is adequately ventilated before work.
Adequate ventilation shall be maintained during the entire period of work.
The ventilation should disperse any released refrigerant and preferably discharge it into the
external atmosphere.
Use the welder in a well-ventilated place.
Using the welder in an enclosed room may cause oxygen deficiency.
Caution

SiMT041509E Safety Cautions
viii
Checking the refrigeration equipment
Where electrical components are to be changed, the new components shall be fit for the
purpose and have the correct specifications.
The manufacturer's maintenance and service guidelines shall be followed at all times.
If there are any unclear points, consult the manufacturer's technical department for assistance.
The following checks shall be applied to any installation work involving R-32:
• The amount of charge is in accordance with the size of the room where the refrigerant
containing parts are installed;
• The ventilation machinery and outlets are operating adequately and are not obstructed;
• If an indirect refrigerating circuit is being used, the secondary circuit shall be checked for
the presence of refrigerant;
• Marking on the equipment is visible and legible. Markings and signs that are illegible shall
be corrected;
• Refrigeration pipes or components are installed in a position where they are unlikely to be
exposed to any substance which may corrode refrigerant containing components, or the
refrigerant containing components are constructed of materials which are inherently
resistant to corrosion or are suitably protected against corrosion.
Checking electrical devices
Repair and maintenance to electrical components shall include initial safety checks and
component inspection procedures. In case there is any fault that could endanger safety, no
electrical supply shall be connected to the circuit until the fault is satisfactorily dealt with.
Initial safety checks shall include:
• that capacitors are discharged: this shall be done in a safe manner to avoid possibility of
sparking;
• that no live electrical components and wiring are exposed while charging, recovering or
purging the system;
• that the equipment is earthed at all times.
Repairs to sealed components
During repairs to sealed components, all electrical supplies shall be disconnected from the
equipment being worked upon before the removal of any sealed covers, etc. If it is absolutely
necessary to have power supplied to equipment during servicing, continuously operating leak
detection shall be installed at the most dangerous point of the system in order to warn of a
potentially hazardous situation.
Particular attention shall be paid to the following: ensure that working on electrical components
does not alter the casing in such a way that affects the level of protection including damage to
cables, excessive number of connections, terminals different from the original specification,
damage to seals, incorrect fitting of glands, etc.
Ensure that the equipment is mounted securely.
Ensure that seals or sealing materials have not degraded such that they no longer serve the
purpose of preventing the ingression of flammable atmospheres. Replacement parts shall be in
accordance with the manufacturer's specifications.
The use of silicon sealant may inhibit the effectiveness of some types of leak detection
equipment. Intrinsically safe components do not have to be isolated before working on them.
Repair to intrinsically safe components
Do not apply any permanent inductive or capacitance load to the circuit without ensuring that
this will not exceed the permissible voltage and current for the equipment in use.
Only intrinsically safe components can be worked on in the presence of a flammable
atmosphere.
The test apparatus shall be of correct rating.
Replace components only with parts specified by the manufacturer. Using other parts may
result in ignition of the refrigerant leaked into the atmosphere.
Wiring
Check that wiring is not subject to wear, corrosion, excessive pressure, vibration, sharp edges
or any other adverse environmental effects. The check shall also take into account the effects of
ageing or continuous vibration from sources such as compressors or fans.

Safety Cautions SiMT041509E
ix
Detecting of R-32
Under no circumstances shall potential sources of ignition be used in the search for or detection
of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used.
Leak detection methods
The following leak detection methods can be applied for systems containing R-32.
Electronic leak detectors shall be used to detect R-32, but the sensitivity may not be adequate
or may need re-calibration (detection equipment shall be calibrated in a refrigerant-free area).
Ensure that the detector is not a potential source of ignition and that it is suitable for the
refrigerant used. Leak detection equipment shall be set to the percentage of the lower
flammability limit (LFL) of the refrigerant and calibrated to fit the refrigerant employed. The
appropriate percentage of gas (maximum 25%) shall be confirmed.
Leak detection fluids are suitable for use with most refrigerants but the use of detergents
containing chlorine shall be avoided as the chlorine may react with the refrigerant and corrode
the copper piping work.
If a leak is suspected, all naked flames shall be removed or extinguished.
If a refrigerant leakage which requires brazing is found, all of the refrigerant shall be recovered
from the system, or isolated (by means of shut off valves) in a part of the system remote from
the point of the leakage. Oxygen free nitrogen (OFN) shall then be purged through the system
both before and during the brazing process.
Removal and evacuation
When breaking the refrigerant circuit to make repairs or any other purpose, conventional
procedures may be used. However, flammability must be taken into consideration. The
following procedure shall be adhered to:
• Remove refrigerant;
• Purge the circuit with inert gas;
• Evacuate the inert gas;
• Purge again with inert gas;
• Carry out cutting or brazing of the circuit.
The refrigerant shall be recovered into the correct recovery cylinders. The system shall be
cleaned with OFN to render the unit safe. (= Flushing) This process may need to be repeated
several times. Compressed air or oxygen shall not be used for this task.
Flushing shall be achieved through breaking the vacuum by filling the system with OFN until the
working pressure is achieved, then venting the OFN into the atmosphere, and finally pulling the
system down to vacuum again. This process shall be repeated until no refrigerant remains
within the system. After the last OFN charge is finished, the system shall be vented down to
atmospheric pressure to enable work. This operation is especially important if brazing
operations on the piping work are to take place.
Ensure that the outlet for the vacuum pump is not close to any ignition sources and that there is
ventilation available.
Charging procedures
In addition to conventional charging procedures, the following requirements shall be met.
Ensure that the charging equipment to be used is not contaminated by different refrigerants.
Hoses or lines shall be as short as possible to minimise the amount of refrigerant contained in
them.
• Cylinders shall be kept upright.
• Ensure that the refrigeration system is earthed before charging the system with refrigerant.
• Label the system when charging is complete (if not already).
• Extreme care shall be taken not to overfill the refrigeration system.
Before recharging, the system shall be tested for leakage with OFN. On completion of charging,
the system shall be tested before commissioning. Follow up leakage test shall be carried out
before leaving the site.