TGM MWFOT12S User manual
FIXED SPEED SERIES - 50 HERTZ
2017 SERVICE MANUAL
Table of Contents Page
1. Safety Precautions ........................................................................................ 1
1. In case of Accidents or Emergency
2. Pre-Installation and Installation
3. Operation and Maintenance
2. Specifications ................................................................................................ 3
1. Model Reference
2. Electrical Wiring Diagrams
3. Product Features ........................................................................................... 9
1. Operation Modes and Functions
4. Maintenance and Disassembly .................................................................... 13
1. Maintenance
2. Disassembly
5. Troubleshooting............................................................................................ 48
1. Safety Caution
2. General Troubleshooting
3. Error Diagnosis and Troubleshooting Without Error Code
4. Quick Maintenance by Error Code
5. Troubleshooting by Error Code
Appendix ............................................................................................................. 67
i) Temperature Sensor Resistance Value Table for T1,T2,T3 and T4 (°C – K)
Contents
1. In Case of Accidents or Emergency ......................................................................2
2. Pre-Installation.......................................................................................................2
3. Operation and Maintenance.................................................................................2
Safety Precautions
Safety
Precautions
Page 2
To prevent personal injury, or property or unit damage,
adhere to all precautionary measures and instructions
outlined in this manual. Before servicing a unit, refer to this
service manual and its relevant sections.
Failure to adhere to all precautionary measures listed in this
section may result in personal injury, damage to the unit or
to property, or in extreme cases, death.
WARNING indicates a potentially hazardous
situation which if not avoided could result in serious
personal injury, or death.
CAUTION indicates a potentially hazardous situation
which if not avoided could result in minor or
moderate personal injury, or unit damage.
1. In case of Accidents or Emergency
WARNING
••If a gas leak is suspected, immediately turn off the
gas and ventilate the area if a gas leak is suspected
before turning the unit on.
••If strange sounds or smoke is detected from the unit,
turn the breaker off and disconnect the power supply
cable.
••If the unit comes into contact with liquid, contact an
authorized service center.
••If liquid from the batteries makes contact with skin or
clothing, immediately rinse or wash the area well with
clean water.
••Do not insert hands or other objects into the air inlet
or outlet while the unit is plugged in.
••Do not operate the unit with wet hands.
••Do not use a remote controller that has previously
been exposed to battery damage or battery leakage.
CAUTION
••Clean and ventilate the unit at regular intervals when
operating it near a stove or near similar devices.
••Do not use the unit during severe weather conditions.
If possible, remove the product from the window
before such occurrences.
2. Pre-Installation and Installation
WARNING
•Use this unit only on a dedicated circuit.
•Damage to the installation area could cause the unit
to fall, potentially resulting in personal injury, prop-
erty damage, or product failure.
•Only qualified personnel should disassemble, install,
remove, or repair the unit.
•Only a qualified electrician should perform electri-cal
work. For more information, contact your dealer,
seller, or an authorized TGM service center.
CAUTION
••While unpacking be careful of sharp edges around
the unit as well as the edges of the fins on the con-
denser and evaporator.
3. Operation and Maintenance
WARNING
••Do not use defective or under-rated circuit breakers.
••Ensure the unit is properly grounded and that a
dedicated circuit and breaker are installed.
••Do not modify or extend the power cable. Ensure
the power cable is secure and not damaged during
operation.
••Do not unplug the power supply plug during
operation.
••Do not store or use flammable materials near the
unit.
••Do not open the inlet grill of the unit during
operation.
••Do not touch the electrostatic filter if the unit is
equipped with one.
••Do not block the inlet or outlet of air flow to the unit.
••Do not use harsh detergents, solvents, or similar items
to clean the unit. Use a soft cloth for cleaning.
••Do not touch the metal parts of the unit when
removing the air filter as they are very sharp.
••Do not step on or place anything on the unit or
outdoor units.
••Do not drink water drained from the unit
••Avoid direct skin contact with water drained from the
unit.
••Use a firm stool or step ladder according to
manufacturer procedures when cleaning or
maintaining the unit.
CAUTION
••Do not install or operate the unit for an extended
period of time in areas of high humidity or in an
environment directly exposing it to sea wind or salt
spray.
••Do not install the unit on a defective or damaged
installation stand, or in an unsecure location.
••Ensure the unit is installed at a level position
••Do not install the unit where noise or air discharge
created by the outdoor unit will negatively impact the
environment or nearby residences.
••Do not expose skin directly to the air discharged by
the unit for prolonged periods of time.
••Ensure the unit operates in areas water or other
liquids.
••Ensure the drain hose is installed correctly to ensure
proper water drainage.
••When lifting or transporting the unit, it is
recommended that two or more people are used for
this task.
••When the unit is not to be used for an extended time,
disconnect the power supply or turn off the breaker.
Contents
1. Model Reference....................................................................................................4
2. Electrical Wiring Diagrams....................................................................................5
2.1 Indoor Unit....................................................................................................5
2.2 Outdoor Unit.................................................................................................7
Specifications
Specifications
Page 4
1. Model Reference
Refer to the following table to determine the specific indoor and outdoor unit model number of your purchased
equipment.
Indoor Unit Model Outdoor Unit Model Capacity (Btu) Power Supply
MWFOT12S MRFOT12DS 12k
MWFOT18S MRFOT18DS 18k 220-240V~, 50Hz,
1Phase
MWFOT24S MRFOT24DS 24k
Specifications
Page 5
2. Electrical Wiring Diagrams
2.1 Indoor unit
Abbreviation Paraphrase
Y/G Yellow-Green Conductor
ION Positive and Negative Ion Generator
CAP Capacitor
PLASMA Electronic Dust Collector
to CCM Comm.Bus Central Controller (for CAC)
X Y E 485 Communication Line
L LIVE
N NEUTRAL
Heater The Electric Heating Belt of Indoor Unit
T1 Indoor Room Temperature
T2 Coil Temperature of Indoor Heat Exchanger Middle
T3 Coil Temperature of Condenser
T4 Outdoor Ambient Temperature
TH Compressor Suction Temperature
EEV Electirc Expansive Valve
T2B Coil Temperature of Indoor Heat Exchanger Outlet
Specifications
Page 6
MWFOT12S MWFOT18S
INDOOR WIRING DIAGRAM M
P1
P2
M
M
5(3 or 2)
ION
OPTIONAL
Y/G
HEATER
X Y E 12V/5V HA HB
ToCCMComm.Busor
485Wire-controller To Randomly
Connected
Wire-controller
To Remote Switch
To Remote Alarm
4
3
3
Applicable to
AC motor only
OPTIONAL
- - - - This symbol indicates the
element is optional,the actual
shape shall prevail.
2
OPTIONAL
CN701
SWITCH BOARD
2
OPTIONAL
CAP
16022000025311
OPTIONAL
MWFOT24S
INDOOR WIRING DIAGRAM M
P1
P2
M
M
5(3 or 2)
2
ION
OPTIONAL
Y/G
HEATER
OPTIONAL
OPTIONAL
X Y E 12V/5V HA HB
ToCCMComm.Busor
485Wire-controller To Randomly
Connected
Wire-controller
ToRemoteSwitch
ToRemoteAlarm
CN701
SWITCH BOARD
2
4
3
3
Applicable to
AC motor only
OPTIONAL
- - - - This symbol indicates the
element is optional,the actual
shape shall prevail.
1(L) S
16022000022180
OPTIONAL
CAP
Specifications
Page 7
2.2 Outdoor Unit
Abbreviation Paraphrase
4-WAY Gas Valve Assembly/4-WAY VALVE
AC-FAN Alternating Current FAN
DC-FAN Direct Current FAN
CT1 AC Current Detector
COMP Compressor
L-PRO Low Pressure Switch
H-PRO High Pressure Switch
MRFOT12DS; MRFOT18DS
1
NOTE:
1. The wi r i ng
di agr am i s f or
expl anat i on
pur pose onl y. The
act ual shape of
t he component s may
be di f f erent .
2. Symbol 1
i ndi cat es
compr essor
i nt er nal or
ext er nal
component s.
3.--------
i ndi cat es opt i onal
component s.
~
COMP
1
Specifications
Page 8
MRFOT24DS
S
1(3) 2(4)
A1 A2
2
Symbol 1: indicates compressor internal or external components.
3
Y/G
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5
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