Heiko M2T050-D2 User manual

Model M2T050-D2
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or
Repair the product or products dealt with in this service information by anyone else could result in serious injury or death
WARNING
Version V1 Date 2023-03-02
SERVICE MANUAL

Contents
Domestic air conditioner
Contents
1. Introduction ............................................................................................1
2. Specifications.........................................................................................7
3. Sensors list ............................................................................................8
4. Piping diagrams .....................................................................................9
5. Operation range....................................................................................10
6. Printed Circuit Board Connector Wiring Diagram .................................11
7. Functions and Control...........................................................................
8. Dimensional drawings...........................................................................
9. Conter of gravity ...................................................................................
10. Service Diagnosis................................................................................
11. Performance and cerves diagrams......................................................
12. Sound level .........................................................................................
13. Circuit diagrams...................................................................................
16
63
62
54
32
31
31
14.Removal Procedure ..................................................................... .......
66

Introduction
1 Introduction
1.1 Model name explanation
1
Domestic air conditioner
2 T 5 -D2
18000 BTU
1 outdoor by 2 indoor
series
00
M
Multi

Introduction
Domestic air conditioner
1.2 Safety Cautions
Be sure to read the following safety cautions before conducting repair work.
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.
About the pictograms
This symbol indicates an item for which caution must be exercised.
The pictogram shows the item to which attention must be paid.
This symbol indicates a prohibited action.
The prohibited item or action is shown inside or near the symbol.
This symbol indicates an action that must be taken, or an instruction.
The instruction is shown inside or near the symbol.
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.
1.2.1 Caution in Repair
Warning
Be sure to disconnect the power cable plug from the plug socket before disassembling the equipment for
a repair.
Working on the equipment that is connected to a power supply can cause an electrical shook.
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 discharges during the repair work, do not touch the discharging refrigerant gas .The
refrigerant gas can cause frostbite.
When disconnecting the suction or discharge pipe of the compressor at the welded section, release the
refrigerant gas completely at a well-ventilated place first.
If there is a gas remaining inside the compressor , the refrigerant gas or cooling machine oil discharges
when the pipe is disconnected, and it can cause injury.
If the refrigerant gas leaks during the repair work, ventilate the area. The refrigerant gas can generate
toxic gases when it contacts flames.
The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit.
Be sure to discharge the capacitor completely before conducting repair work . A charged capacitor can
cause an electrical shock.
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 can cause an electrical shock or
fire.
2

Introduction
Domestic air conditioner
Warning
Do not repair the electrical components with wet hands . Working on the equipment with wet hands can
cause an electrical shock
Do not clean the air conditioner by splashing water. Washing the unit with water can cause an electrical
shock.
Be sure to provide the grounding when repairing the equipment in a humid or wet place, to avoid
electrical
shock.
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 cause injury.
Do not tilt the unit when removing it. The water inside the unit can spill and wet the furniture and floor.
Be sure to check that the cooling cycle section has cooled down sufficiently before conducting repair
work. Working on the unit when the cooling cycle section is hot can cause burns.
Use the welder in a well-ventilated place. Using the welder in an enclosed room can cause oxygen
deficiency.
1.2.2 Cautions Regarding Products after Repair
Warning
Be sure to use parts listed in the service parts list of the applicable model and appropriate tools to
conduct repair work. Never attempt to modify the equipment. The use of inappropriate parts or tools can
cause an electrical shock, excessive heat generation or fire.
When relocating the equipment, make sure that the new installation site has sufficient strength to
withstand the weight of the equipment.
If the installation site does not have sufficient strength and if the installation work is not conducted
securely, the equipment can fall and cause injury.
Be sure to install the product correctly by using the provided standard installation frame.
Incorrect use of the installation frame and improper installation can cause the equipment to fall, resulting
in injury.
For
integral
units only
Be sure to install the product securely in the installation frame mounted on a window frame.
If the unit is not securely mounted, it can fall and cause injury.
For
integral
units only
3

Introduction
Domestic air conditioner
Warning
Be sure to use an exclusive power circuit for the equipment, and follow the technical standards related to
the electrical equipment, the internal wiring regulations and the instruction manual for installation when
conducting electrical work.
Insufficient power circuit capacity and improper electrical work can cause an electrical shock or fire.
Be sure to use the specified cable to connect between the indoor and outdoor units. Make the
connections securely and route the cable properly so that there is no force pulling the cable at the
connection terminals.
Improper connections can cause excessive heat generation or fire.
When connecting the cable between the indoor and outdoor units, make sure that the terminal cover
does
not lift off or dismount because of the cable.
If the cover is not mounted properly, the terminal connection section can cause an electrical shock,
excessive heat generation or fire.
Do not damage or modify the power cable.
Damaged or modified power cable can cause an electrical shock or fire. Placing heavy items on the
power cable, and heating or pulling the power cable can damage the cable.
Do not mix air or gas other than the specified refrigerant (R-410A / R22) in the refrigerant system.
If air enters the cooling system, an excessively high pressure results, causing equipment damage
and injury.
If the refrigerant gas leaks, be sure to locate the leak and repair it before charging the refrigerant. After
charging refrigerant, make sure that there is no refrigerant leak.
If the leak cannot be located and the repair work must be stopped, be sure to perform pump-down and
close the service valve, to prevent the refrigerant gas from leaking into the room. The refrigerant gas
itself
is harmless, but it can generate toxic gases when it contacts flames, such as fan and other heaters,
stoves and ranges.
.
When replacing the coin battery in the remote controller, be sure to disposed of the old battery to prevent
children from swallowing it.
If a child swallows the coin battery, see a doctor immediately.
Caution
Installation of a leakage breaker is necessary in some cases depending on the conditions of the
installation site, to prevent electrical shocks.
4

Introduction
Domestic air conditioner
Do not install the equipment in a place where there is a possibility of combustible gas leaks.
If a combustible gas leaks and remains around the unit, it can cause a fire.
Be sure to install the packing and seal on the installation frame properly. If the packing and seal are not
installed properly, water can enter the room and wet the furniture and floor.
1.2.3 Inspection after Repair
Warning
Check to make sure that the power cable plug is not dirty or loose, then insert the plug into a power outlet
all the way.
If the plug has dust or loose connection, it can cause an electrical shock or fire.
If the power cable and lead wires have scratches or deteriorated, be sure to replace them.
Damaged cable and wires can cause an electrical shock, excessive heat generation or fire.
Warning
Do not use a joined power cable or extension cable, or share the same power outlet with other electrical
appliances since it can cause an electrical shock, excessive heat generation or fire.
Caution
Check to see if the parts and wires are mounted and connected properly, and if the connections at the
soldered or crimped terminals are secure. Improper installation and connections can cause excessive
heat generation, fire or an electrical shock.
If the installation platform or frame has corroded, replace it. Corroded installation platform or frame can
cause the unit to fall, resulting in injury.
5

Introduction
Domestic air conditioner
Check the grounding, and repair it if the equipment is not properly grounded. Improper grounding can
cause an electrical shock.
Be sure to measure the insulation resistance after the repair, and make sure that the resistance is 1 M
ohm or higher.
Faulty insulation can cause an electrical shock.
Be sure to check the drainage of the indoor unit after the repair.
Faulty drainage can cause the water to enter the room and wet the furniture and floor.
1.2.4 Using Icons
Icons are used to attract the attention of the reader to specific information. The meaning of each icon is described in
the table below:
1.2.5 Using Icons List
Icon Type of Information Description
Note
Note
A “note” provides information that is not indispensable, but may
nevertheless be valuable to the reader, such as tips and tricks.
Caution
Caution
A “caution” is used when there is danger that the reader, through
incorrect manipulation, may damage equipment, loose data, get
an
unexpected result or has to restart (part of) a procedure.
Warning
Warning
A “warning” is used when there is danger of personal injury.
Reference
A “reference” guides the reader to other places in this binder or in
this manual, where he/she will find additional information on a
specific topic.
6
Using a multi-meter to test short circuit of the four roots wires, make sure no short circuit happen.
1.2.6 Embedded wire checking before installation
Check the embedded wire diameter suitable to request:
(Power supply from indoor: 2.5kw ≥1.0mm2 3.5kw,5kw ≥1.5mm2 ,7kw ≥2.5mm2 ; Power supply from outdoor
≥1.0mm2)
Check the embedded wire are four roots, L/N/COM/GND; GND is needed, if not, thunder or high voltage wave
from power grid will impact to the performance

Specification
Domestic air conditioner
2 Specifications
NOMINAL DISTRIBUTION SYSTEM VOLTAGE
1/esahP
05zHycneuqerF
220-240VegatloV
NOMINAL CAPACITY and NOMINAL INPUT
Capacity rated KW
Btu/h
Power Consumption(Rated) KW
W/WPOCS/REES
Annual energy consumption KWh
h/³mlavomeRerutsioM
TECHNICAL SPECIFICATIONS-UNIT
Dimensions H*W*D mm 553×800×275
Packaged
Dimensions H*W*D mm 625×908×405
GK/thgieW
GK/thgiewssorG
Sound level 53BderusseepdnuoS
36BdrewopdnuoS
ELECTRICAL SPECIFICATIONS
gnitaehgnilooc
AtnerrucgninnurlanimoN
Maximum running current A
AtnerrucgnitratS
TECHNICAL SPECIFICATIONS-PARTS
gnitaehgnilooc
Compressor
rosserpmoCyratoRepyT
ledoM
WtuptuorotoM
Oil type
RM - LP56EG or equivalent 480 ±20 ml
LemulovegrahcliO
Fan
naflaixAepyT
04WtuptuorotoM
2400
h/³m)hgih(etarwolfriA
mpr)wol/hgih(deepS
Heat
exchanger
Type ML fin- 7HI-HX tube
hctif*egats*woR
7
09+09
gnilooc gnitaeh
16380(4430-18430)
1.4
275 1400
4.8 4.0
6.14.0
12 single:2×10
36
39
9.29.1
6.09 5.9
1.6 2.5
GTD130UKQA8JT6
1350
1.65
1000/400
2*24*1.32
-3
17060(5460-20135)
1.34

Specification
Domestic air conditioner
TECHNICAL SPECIFICATIONS-OTHERS
Refrigerant
circuit
Refrigerant type R32
Refrigerant charge KG 1.1
Maximum allowable distance
between indoor and outdoor m30(double)
20(single)
Maximum allowable level difference m 15
Refrigerant control EEV
Piping connections
(external diameter)
liquid mm 6.35
gas mm 9.52
drain mm 16
Heat insulation type Both liquid and Gas pipes
Max. piping Length m
Max. Level Difference m 15
Chargeless m 20
Amount of Additional Charge of Refrigerant g/m 20
Note: the data are based on the conditions shown in the table below
htgnelgnipiPgnitaehgnilooc
Indoor: 27 DB/19 WB
Outdoor: 35 DB/24 WB
Indoor:20 DB
Outdoor: 7 DB/6 WB 5m
3 Sensors list
Conversation formulae
Kcal/h= KW×860
Btu/h= KW×3414
cfm=m³/min×35.3
30(double) 20(single)
type Description Qty
itcetedrofdesustIrosnestneibmA edisroodtuofoerutarepmetgn
Suction sensor Its used for detecting suction pipe temperature of compressor to
adjust gas flowing
1
Defrosting sensor Its used for controlling outdoor defrosting at heating mode 1
taeh-revofoesacnirosserpmocrofdesustIrosnesgnigrahcseD
Liquid-gas pipe
sensor
Its used for adjusting the valve opening of the electric expansion 2
valve.

Pinping diagrams
Domest ic air condit ioner
4 Pinping diagrams
9
9.52CuT
9.52CuT
6.35CuT
6.35CuT

Operation range
Domestic air conditioner
5 Operation range
10
-10
0
21
27
35
20
40
60
46
-20
-40

6. Printed Circuit Board Connector Wiring Diagram
Connectors
PCB (1) Control PCB
daolhtiwtcennoCrotcennocBCPseires
1 CN1
Connector for power N and L
2 CN2
3 CN3 Connector for ground
4 CN9
Connector for CN2,CN1 on the module board
5 CN 8
6 CN10 Connector for four way valve coil
7 CN17
8 CN16
Connector for thermistors
9 CN18
10 CN20
11 CN31
12 CN25
13 CN21
14 CN22
Connector for electric expansion valves
Connector for fan motor
Connector for DC POWER 15Vand 5V to the module board
15 CN23 Connector for communicate between the control board and the module
board
16 CN24
17 CN26
Connector to N and P of the module board
18 CN5 Connector for communicate between indoor and outdoor unit
Wiring diagram
Domestic air conditioner
11

Note: Other Designations
PCB(1) (Control PCB)
1) FUSE 1, Fuse (25A,250VAC)
2)LED 1 keep light representative normal ,if keep flash interval representative trouble Alarm
3)RV1,RV2,RV3 Varistor
PCB (2) Module PCB
daolhtiwtcennoCrotcennocBCPseires
1 P (CN8)
2 N (CN9)
3 LO (CN4)
Connector for reactor
4 LI (CN3)
7CN5(U)
8CN6(V)
9CN7(W)
10 CN10 Connector for the DC power 5V and 15V form the control PCB
11 CN11 Connector for communicate between the control board and the module
board
Connector for CN26,CN24 on the control board
5AC_L(CN1)
6AC_N(CN2)
Connector for CN8,CN9 on the control board
Connector for the compressor
Wiring diagram
Domestic air conditioner
12

wiring diagram
Domestic air conditioner
PCB (1)
13

wiring diagram
14 Domestic air conditioner
PCB(2)

Wiring diagram
Domestic air conditioner
15
CN3
●
CN2
CN1
CN6
CN7
CN5COM A
N
CN26
CN24
CN23
CN22
CN11
CN12
CN9
CN8
AC-L O UT
CN10
VALVE
CN48
BO TTOM
HEATER
CN16
E-VALVE
A
CN17
E-VALVE
B
CN20
HW CS TQ
CN18
XQ
CN31
XG -A
CG-A
CN25
XG -B
CG-B
CN21
DC FAN
CN8
CN3
CN11
CN10
CN38 CN29
MOUDLE
COM
MOUDLE
PO WER
P
CN9
N
CN7
W
CN6
V
CN5
U
R(U)
S(V)
C(W)
G
M
Compressor
MOUDLE PCB OUTDOOR PCB
LI
CN1
AC-L
CN2
AC-N
CN4
LO
Reactor
B W R OR BL
P
N
BL
B
M
R: RED B: BLACK
BL: BLUE GR: GRAY
W: WHITE BR: BROWN
Y/G: YELLOW/GREEN
1.Don't touch capacitor,even after plug-off(danger
●
of electric shock).
2.The capacitor retains high voltage even after the
plug-off.
3.For your safety,be sure to wait at least 5 minutes.
The dotted parst are optional.
DC Fan
motor <A&B Pipe
temp.sensor>
CG-B
XG -B
CG-A
XG -A
Sution temp. sensor
Ambient temp. s.
Defrost temp. s.
Comp. temp. s.
M
A&B Electronic
expansion valve
M
Bottom
heater
4-way
valve
B
W
W
AC-N OUT
COM B
AC-L O UT
AC-N OUT
W
R
BR
W
B
W
B
AC-N
AC-L
PE
W
B
Y/G
Condensor
GG
G
RJ45 DRAM
G
●
G
Power
●
To Indoor BTo Indoor A
0011506856
OUTDOOR WIRING DIAGRAM
Warning:
Y/G
Y/G
CAP CAP
3(C) 3(C)
1---N
2---L
G
2U18:
CN1 CN5CN4CN3CN2
2U14:
2U18:
2U14: CN7 CN8 CN9 CN6

7.1.1 The operation frequency of outdoor unit and its control
7.1.1.1 The operation frequency control of compresso r
The operation frequency scope of compressor
Mode Minimun operation frequency Maximun operation frequency
zH811zH03gnitaeH
zH08zH52noitaregirfeR
7.1.1.2 The starting of compressor
When the compressor is started for the first time, it must be kept under the conditions of
30Hz,40Hz,58Hz for one minute (the overheating protection of the outdoor unit air-blowing temperature,
immediately decrease the frequency when the compressor is overflowing and releasing the
pressure) then it can be operated towards the target frequency. When the machine runs normally,
there’s no such process. After starting the compressor for operation, the compressor should run
according to the calculated frequency, and every determined frequency for protection should be
prior to the calculated frequency.
7.1.1.3 The speeds of increasing or decreasing the frequency of the compressor
The speed of increasing or decreasing the frequency rapidly 1 -----------1HZ/second
The speed of increasing or decreasing the frequency slowly 2 -----------1HZ/10seconds
7.1.1.4 The calculation of the compressor’s frequency
1 The minimum/maximum frequency limitation
AWhile refrigerating: is the maximum operation frequency of the
compressor; IN is the minimum operation frequency of the compressor.
BWhile heating: is the maximum operation frequency of the compressor;
IN is the minimum operation frequency of the compressor.
1The frequency limitation which is affected by the environment temperature.
Heating mode:
7.1 The control system of outdoor unit
.
7.Functions and Control
Functions and control
Domestic air conditioner
16
Serial
No.
Temperature scope Frequency limitation
1 Wh_c<-12 Max_hz1 118HZ
2 Wh_c<-8 Max_hz2 118HZ
3 Wh_c<-2 Max_hz3 118HZ
ZH8114zh_xaM5<c_hW4
5 Wh_c<10 Max_hz5 118HZ
6 Wh_c<16 Max_hz6 118HZ
7Wh_c< 20 Max_hz7 112HZ
8Wh_c>20 Max_hz8 102HZ

Refrigeration/dehumidification mode::
Serial No. Temperature scope Frequency limitation
1 Wh_c<16 Max_hz1 37 HZ
2 Wh_c<23 Max_hz2 45 HZ
3 Wh_c<29 Max_hz3 56 HZ
4 Wh_c<32 Max_hz4 63 HZ
5 Wh_c<40 Max_hz5 90 HZ
Remarks: the above are not only the maximum frequency limitations of the complete appliance
which are affected by the environment, but also the maximum ability limitation of the system.
When the starting ability is not the maximum, its maximum frequency limitation is calculated by
the following equations:
Refrigeration/dehumidification:
Heating mode
< 0 < 2 < 3 < 4 ≥ 4
The percentage of
the rated frequency P
80%90% 95 % 100% 110%
< 0 < 2 < 3 < 4 ≥ 4
The percentage of the
rated frequency P
80% 90% 98% 105% 115%
The indoor set
airflow speed
Breeze Low Medium High Strong Quiet Healthy
airflow
Ki
60 70% 85% 100% 108% 60% 60%
Functions and control
Domestic air conditioner
17
6 Wh_c<48 Max_hz4 90 HZ
7 Wh_c>48 Max_hz5 90 HZ
<1
85%
<1
85%
F（reference frequency）=∑Fi（reference frequency）
Note - valid internal machine (starting and running in accordance with the state) to participate
in the calculation
Fi（reference frequency）＝Fei（Computed base frequency）*Kw
（Outer ring temperature coefficient（External ring temperature on frequency limitation
section））*Pi（Temperature difference between the weight） *Ki（Wind speed weight）
（Note: the reference frequency Fi is rounded after calculation and no rounding is performed；）
i= machine A, machine B...
Pi
Pi

When the outdoor unit is shut down, the valve is opened completely for 2 minutes, and then
begin initialization.
The scope of refrigerationg valve 90-----480 steps
The scope of heating valve 70-----480 steps
The valves are adjusted according to the degree of superheat SHa SHa.
7.1.2 Four way control
For the details of defrosting four-way valve control, see the defrosting process.
Four way working in other ways:
Under the mode of heating, open the four-way valve, when the compressor is not started or
changed to non-heating mode, make sure the compressor is stoped for 2 minutes, and then
close the four-way valve.
7.1.3 Protection function
7.1.3.1 TTC high temperature-preventing protection
Once the machine is started, it can run TTC overheating protection of air-blowing, but air-blowing
sensor malfunction must alarmafter10minutes during which the compressor is started (during the
course of self-detection, there’s no such limitation)
TTC
TTC>=116 lasts for 20 seconds. Overheating protection of air-blowing,
alarm malfunction to the indoor, others don’t last.
TC high temperature-preventing control of the indoor heating unit
Tpg_indoor is the highest value of the effective indoor unit (start it and it is in accord with the
running state).
The indoor heat exchanger sensor tests the temperature of the indoor heat exchanger. If the
temperature is higher than 54 , decrease the rotate speed of the compressor and do the high
temperature-preventing protection of the indoor heat exchanger; if the temperature of the indoor
heat exchanger is lower than 44 , recover to the normal control.
7.1.3.2
Functions and control
Domestic air conditioner
18
abnormal stop
Maintain current frequency
Electric control contact (normal operation)
compressor stops for
more than 3 minutes
TTC< 92℃Compressor start to restore normal control
If there are three failures in three minutes,