Sinclair MULTI VARIABLE SERIES User manual

MULTI VARIABLE SERIES
MV-E14BI, MV-E18BI
SERVICE MANUAL
EN


“Originalinstructions”
IMPORTANT NOTE:
Read this manual carefully before installing
or operating your new air conditioning
unit. Make sure to save this manual for
future reference.

Service Manual
Table of Contents
Part Ⅰ: Technical Information...............................................................................1
1. Summary..............................................................................................................................1
2. Specications..................................................................................................................2
3. Outline Dimension Diagram................................................................................6
4. Refrigerant System Diagram..............................................................................7
5. Electrical Part...................................................................................................................8
5.1 Wiring Diagram.........................................................................................................................8
5.2 PCB Printed Diagram .............................................................................................................10
6. Function and Control..............................................................................................11
Part Ⅱ: Installation and Maintenance .........................................................14
7. Notes for Installation and Maintenance..................................................14
8. Installation Manual....................................................................................................19
8.1 Electrical Connections............................................................................................................20
8.2 Installing the Outdoor Unit......................................................................................................21
8.3 Installation Dimension Diagram..............................................................................................22
8.4 Check after Installation...........................................................................................................23
9. Maintenance....................................................................................................................24
9.1 Precautions before Performing Inspection or Repair .............................................................24
9.2 Flashing LED of Indoor/Outdoor Unit and Primary Judgement .............................................25
9.3 Malfunction Checking and Elimination ...................................................................................26
9.4 Maintenance Method for Normal Malfunction.........................................................................38
10. Exploded View and Parts List ......................................................................40
11. Removal Procedure...............................................................................................43
Appendix:................................................................................................................................49
Appendix 1: Reference Sheet of Celsius and Fahrenheit ............................................................49
Appendix 2: Conguration of Connection Pipe.............................................................................49
Appendix 3: Pipe Expanding Method ...........................................................................................50
Appendix 4: List of Resistance for Temperature Sensor ..............................................................51

1
Service Manual
1. Summary
Part Ⅰ: Technical Information
Outdoor Unit
MV-E14BI
MV-E18BI

2
Service Manual
2. Specications
Model MV-E14BI
Product Code CB228W08401
Power
supply
Rated Voltage V~ 220-240
Rated Frequency Hz 50
Phases 1
Cooling capacity W 4100
Heating capacity W 4400
Cooling Power Input W 1200
Heating Power Input W 1180
Cooling Current Input A 5.32
Heating Current Input A 4.53
Rated Power Input W 1780
Rated Current A 7.90
SEER W/W 6.10
SCOP W/W 4.00
Outdoor
Unit
Compressor Trademark ZHUHAI LANDA COMPRESSOR
CO.,LTD
Compressor Model QXA-B141zF030A
Compressor Refrigerant Oil Type RB68EP
Compressor Type Inverter Rotary
L.R.A A 25
Compressor Rated Load Amp (RLA) A 7.2
Compressor Power Input W 1440
Compressor Thermal Protector 1NT11L-6233 or HPC 115/95 or
KSD115OC
Throttling Method Electron expansion valve
Cooling Operation Ambient Temperature Range OC -15~43
Heating Operation Ambient Temperature Range OC -20~24
Condenser Material Aluminum Fin-copper Tube
Condenser Pipe Diameter mm Φ9.52
Rows-Fin Gap(mm) mm 2-1.4
Coil length (l) X height (H) X coil width (L) mm 800X44X559
Fan Motor Speed (rpm) (H/M/L) rpm 900
Output of Fan Motor W 30
Fan Motor RLA A 0.39
Fan Motor Capacitor μF /
Air Flow Volume of Outdoor Unit m3/h 2600
Fan Type-Piece Axial-ow
Fan Diameter mm Φ438-116
Defrosting Method Automatic Defrosting
Climate Type T1
Isolation I
Moisture Protection IP24
Permissible Excessive Operating Pressure for
the Discharge Side MPa 4.3
Permissible Excessive Operating Pressure for
the Suction Side MPa 2.5
Dimension (WXHXD) mm 899X596X378
Dimension of Package (LXWXH) mm 945X417X630
Dimension of Package(LXWXH) mm 948X420X645
Net Weight kg 43
Gross Weight kg 46
efrigerant Charge R32
Refrigerant Charge kg 1.40

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Service Manual
Outdoor
Unit
Cross-sectional Area of Power Cable Conductor mm2/
Recommended Power Cable(Core) N 3
Connection Pipe Connection Method - Flare Connection
Not Additional Gas Connection Pipe Length m 10
Connection Pipe Gas Additional Charge g/m 20
Outer Diameter of Liquid Pipe
(Metric) mm Φ6
Outer Diameter of Gas Pipe
(Metric) mm Φ9.52
Outer Diameter of Liquid Pipe
(Metric) mm Φ6
Outer Diameter of Gas Pipe)
(Metric) mm Φ9.52
Connection Pipe Max. Height Distance(indoor and
indoor) m 5
Max. equivalent connection pipe length(outdoor to
last indoor) m 10
Connection Pipe Max. Length Distance(total lenght) m 20
The above data is subject to change without notice; please refer to the nameplate of the unit.

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Service Manual
Model MV-E18BI
Product Code CB228W08501
Power
supply
Rated Voltage V~ 220-240
Rated Frequency Hz 50
Phases 1
Cooling capacity W 5200
Heating capacity W 5400
Cooling Power Input W 1450
Heating Power Input W 1300
Cooling Current Input A 6.43
Heating Current Input A 5.77
Rated Power Input W 1.78
Rated Current A 7.9
SEER W/W 3.59
SCOP W/W 4.15
Outdoor
Unit
Compressor Trademark ZHUHAI LANDA COMPRESSOR
CO.,LTD
Compressor Model QXF-B141ZF030A
Compressor Refrigerant Oil Type 68DA
Compressor Type Inverter Rotary
L.R.A A 25
Compressor Rated Load Amp (RLA) A 6.5
Compressor Power Input W 1410
Compressor Thermal Protector 1NT11L-6233 or HPC 115/95 or
KSD115OC
Throttling Method Electron expansion valve
Cooling Operation Ambient Temperature Range OC -15~43
Heating Operation Ambient Temperature Range OC -20~24
Condenser Material Aluminum Fin-copper Tube
Condenser Pipe Diameter mm Φ9.52
Rows-Fin Gap(mm) mm 19.05X22
Coil length (l) X height (H) X coil width (L) mm 760X44X559
Fan Motor Speed (rpm) rpm 800/900
Output of Fan Motor W 30
Fan Motor RLA A 0.39
Fan Motor Capacitor μF /
Air Flow Volume of Outdoor Unit m3/h 2600
Fan Type-Piece Axial-ow
Fan Diameter mm Φ438-116
Defrosting Method Automatic Defrosting
Climate Type T1
Isolation I
Moisture Protection IPX4
Permissible Excessive Operating Pressure for the
Discharge Side MPa 4.3
Permissible Excessive Operating Pressure for the
Suction Side MPa 2.5
Dimension (WXHXD) mm 899X378X596
Dimension of Package (LXWXH) mm 945X417X630
Dimension of Package(LXWXH) mm 948X420X645
Net Weight kg 43
Gross Weight kg 46
efrigerant Charge R32
Refrigerant Charge kg 1.05

5
Service Manual
The above data is subject to change without notice; please refer to the nameplate of the unit.
Outdoor
Unit
Cross-sectional Area of Power Cable Conductor mm21.5
Recommended Power Cable(Core) N 3
Connection Pipe Connection Method Flare Connection
Not Additional Gas Connection Pipe Length m 10
Connection Pipe Gas Additional Charge g/m 20
Outer Diameter of Liquid Pipe
(Metric) mm Φ6
Outer Diameter of Gas Pipe
(Metric) mm Φ9.52
Outer Diameter of Liquid Pipe
(Metric) mm Φ6
Outer Diameter of Gas Pipe
(Metric) mm Φ9.52
Connection Pipe Max. Height Distance(indoor and
indoor) m 5
Max. equivalent connection pipe length(outdoor to
last indoor) m 10
Connection Pipe Max. Length Distance(total lenght) m 20

6
Service Manual
3. Outline Dimension Diagram
Unit:mm
303838
550
899 378
596
354

7
Service Manual
4. Refrigerant System Diagram
outdoor
indoor
D1
C1
B1
A1
filter
A heat exchanger
gas -liquid separator
inverter compressor
discharge silencer
discharge temperature
sensor
SP
4-way valve
outdoor heat exchanger
fan
high pressure switch
B heat exchanger
C heat exchanger
D heat exchanger
filter
filter
filter
filter
C2
C3
D3
D2
B3
B2
A2
A3
A1:
A－unit electronic expansion valve B1:B-unit electronic expansion valve
C1:C-unit electronic expansion valve D1:D-unit electronic expansion valve
A2:A-unit gas pipe temperature sensor B2:B-unit gas pipe temperature senso
r
C2:C-unit gas pipe temperature sensor D2:D-unit gas pipe temperature senso
r
A3:
A－unit liquid pipe temperature sensor B3:B-unit liquid pipe temperature sensor
C3:C-unit liquid pipe temperature sensor D3:D-unit liquid pipe temperature senso
r

8
Service Manual
5. Electrical Part
5.1 Wiring Diagram
Symbol Symbol Color Symbol Symbol Color Symbol Name
WH White GN GREEN COMP Compressor
YE Yellow BN Brown Grouding wire
RD Red BU Blue
YEGN Yellow/Green BK Black
VT Violet OG Orange
●Instruction
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These circuit diagrams are subject to change without notice, please refer to the one supplied with the unit.

10
Service Manual
16 1234 5678
9
10
11
12
13
14
15
5.2 PCB Printed Diagram
● Top view
● Bottom view
1Overload protection
terminal of compressor
2Terminal of temperature
sensor
3High-pressure protection
terminal
4Low-pressure protection
terminal
5 Terminal of outdoor fan
6Electric heating terminal
of chassis
7 4-way valve terminal
8Electric heating terminal
of compressor
9Terminal of electronic
expansion valve A
10 Terminal of electronic
expansion valve B
11 2-way valve terminal
12
Terminal of
communication wire
between indoor unit and
outdoor unit
13 Terminal of neutral wire
for communication
14 Terminal of live wire
15 Terminal of neutral wire
16 Terminal of compressor

11
Service Manual
6. Function and Control
1 Basic functions of the system
1.1 Cooling Mode
1.1.1 Cooling conditions and process:
If
the compressor is in stop status and start the unit for cooling operation, when one of the indoor units reaches the cooling
operation
condition, the unit start cooling operation; in this case, the electronic expansion valve, the outdoor fan and
the
compressor start operation.
1.1.2 Stop in cooling operation
1.1.2.1 Compressor stops
The compressor stops imme
diately, the outdoor fan stops after 1min.
1.1.2.2 Some of the indoor units reach the stop condition (the compressor does not stop)
The
compressor operates immediately according to the required frequency. For the indoor unit with no requirement, the
corresponding electronic expansion valve is closed to OP.
1.1.3 Cooling mode transfers to heating mode
When
the unit transfers to heating mode, the 4-way valve is energized after the compressor stops for 2min. The other disposals
are the same as stopping in cooling mode.
1.1.4 4-
way valve: in this mode, the 4-way valve is closed.
1.1.5 Outdoor fan control in cooling mode
The
outdoor fan starts before 5s of the starting of compressor. The outdoor fan will run in high speed for 3min after starting and
then
it will run in set speed. The fan shall run at every speed for at least 80s. (When the quantity of running indoor unit is
changed, the unit
will enter the control described in 1.3.5.1 and 1.3.5.2);
When the compressor stops, the outdoor fan runs at present speed and stops after 1min.
1.2 Dry Mode
1.2.1 The dr
y conditions and process are the same as those in cooling mode;
1.2.2 The status of 4-
way valve: closed;
1.2.3 The temperature setting range: 16 ~ 30
ć;
1.2.4 Protection function: the same as those in cooling mode;
1.2.5 In dr
y mode, the maximum value A of the capacity requirement percentage of single unit is 90% of that in cooling mode.
The open co
ndition of the electronic expansion valve, outdoor fan and compressor is the same as those in cooling mode.
1.3 Heating Mode
1.3.1 Heating conditions and process:
When one of the indoor units reaches the heating operation condition, the unit starts heating operation.
1.3.2 Stop in heating operation:
1.3.2.1 When all the indoor units reach the stop condition, the compressor stops and the outdoor fan stops after 1min;
1.3.2.2 Some of the indoor units reach the stop condition
The compressor redu
ces the frequency immediately and operates according to the required frequency;
1.3.2.3 Heating mode transfers to cooling mode(dry mode), fan mode
a.
The compressor stops; b. the power of 4-way valve is cut off after 2min; c. the outdoor fan stops after 1min; d. the status of
4-
way valve: energized;

12
Service Manual
1.3.3 Outdoor fan control in heating mode
The outdoor fa
n starts before 5s of the starting of compressor and then it will run in high speed for 40s;
The fan shall run at every speed for at least 80s;
When the compressor stops, the outdoor fan stops after 1min.
1.3.4 Defrosting function
When
the defrosting condition is met, the compressor stops; the electronic expansion valve of all indoor units open in big angle;
the
outdoor fan stops after 40s of the stop of compressor, meanwhile, the 4-way valve reverses the direction; after the 4-way
valve
reverses the direction, the compressor starts; then begin to calculate the time of defrosting, the frequency of the
compressor rises to reach the defrosting frequency.
1.3.5 Oil-returned control in heating mode
1.3.5.1 Oil-returned condition
The
whole unit is operating in low frequency for a long time
1.3.5.2 Oil-returned process in heating mode
The indoor
unit displays “H1”
1.3.5.3 Oil-returned finished condition in heating mode
The duration re
aches 5min
1.4 Fan Mode
The compressor, the outd
oor fan and the 4-way valve are closed; temperature setting range is 1630ć.
2. Protection Function
2.1 Mode Conflict Protection of indoor unit
When the setting mode is different of different indoor unit, the unit runs in belo
w status:
a. The mode of the first operating indoor unit is the basic mode, then compare the mode of the other indoor units to see if th
ere
is a conflict. Cooling mode (dry mode) is in conflict
with heating mode.
b.
Fan mode is in conflict with heating mode and the heating mode is the basic mode. No matter which indoor unit operates first,
the unit
will run in heating mode.
2.2 Overload protection function
When
the tube temperature is a little low, the compressor raises the operation frequency; when the tube temperature is a little
high,
the compressor frequency is restricted or lows down the operation frequency; when the tube temperature is too high, the
compressor protection stops running.
If
the discharge temperature protection continuously appears for 6 times, the compressor can’t resume running. The
compressor
can resume running after cutting off the power and then putting through the power. (if the running time of the
compressor is longer than 7min, the protection times record will be cleared)
2.3 Discharge Protection Function
When
the discharge temperature is a little low, the compressor raises the operation frequency; when the discharge temperature
is a little high, the compressor frequency is
restricted or lows down the operation frequency; when the discharge temperature is
too high, the compressor protection stops running.
If
the discharge temperature protection continuously appears for 6 times, the compressor can’t resume running. The
compressor
can resume running after cutting off the power and then putting through the power. (if the running time of the
compressor is longer than 7min, the protection times record will be cleared)

13
Service Manual
2.4 Communication malfunction
Detection of the quantity
of installed indoor units:
After 3min of energizing, if the outdoor unit does not receive the communication data
of certain indoor unit, the outdoor unit wi
ll
j
udge that indoor unit is not installed and will treat it as it is not installed. If the outdoor unit receives the communication data of
that indoor unit later, the outdoor unit
will treat that unit as it is installed.
2.5 Overcurrent Protection
a. Overcurrent protection of complete unit; b. phase
wire current protection; c. compressor phase current protection
2.6 Compressor high-pressure protection
2.6.1
When the high-pressure switch is detected cut off for 3s continuously, the compressor will enter high-pressure protection
as
it stops when reaching set temperature. Meanwhile, the outdoor unit will send the signal of “high-pressure protection” to th
e
indoor units;
2.6.2
After the appearance of high-pressure protection, when the high-pressure switch is detected closed for 6s continuously
,
the compressor can resume running only after cutting off the po
wer and then putting through the power.
2.7 Compressor overload protection
If the compressor overload switch is detected having movement, the indoor unit
will display the corresponding malfunction as it
stops
when the indoor temperature reaching set temperature. When the compressor stops for more than 3min and
the
compressor overload
switch is reset, the unit will resume operation status automatically. If the protection appears for more th
an
6 times (if the running time of the compressor is longer than 30min, the protection times record
will be cleared), the unit can
not
resume
operation status automatically, but can resume running only after cutting off the power and then putting through
the
po
wer.
2.8 Compressor Phase-lacking Protection
When
the compressor starts, if one of the three phases is detected open, the compressor will enter phase-lacking
protection.
The
malfunction will be cleared after 1min, the unit will restart and then detect if there is still has phase-lacking protectio
n. If the
phase-lacking
protection is detected for 6 times continuously, the compressor will not restart but can resume running only afte
r
cutting
off the power and then putting through the power. If the running time of the compressor is longer than 7min,
the
protection times record
will be cleared.
2.9 IPM Protection
2.9.1
When the IPM module protection is detected, the unit will stop as the indoor temperature reaching set temperature, PFC is
closed,
display IPM protection malfunction. After the compressor stops for 3min, the unit will resume operation status
automatically;
if the IPM protection is detected for more than 6 times continuously (If the running time of the compressor is
longer
than 7min, the protection times record will be cleared), the system will stop and send the signal of module protection t
o
indoor unit.
The unit can not resume operation status automatically, but can resume running only after cutting off the power an
d
then putting through the po
wer.
2.9.2 IPM module overheating protection
2.9.2.1 When
TIPMη85ć, prohibit to raise frequency;
2.9.2.2
When TIPM≥90ć, the operation frequency of compressor lows down by 15% every 90s according to the
present
capacity
requirement of the complete unit. It will keep 90s after lowing down the frequency. After lowing down the frequency, i
f
T
IPM≥90ć, the unit will circulate the above movement until reaching the minimum frequency; if 85ćζTIPMζ90ć, the unit will
run at this frequency;
when TIPM≤85ć, the unit will run at the frequency according to the capacity requirement;
2.9.2.3
When TIPM≥95ć, the compressor stops. After the compressor stops for 3min, if TIPMζ85ć, the compressor and
the
outdoor fan
will resume operation.

14
Service Manual
1. Select the installation location according to the require-
ment of this manual.(See the requirements in installation
part)
2. Handle unit transportation with care; the unit should not
be carried by only one person if it is more than 20kg.
3. When installing the indoor unit and outdoor unit, a suf-
cient xing bolt must be installed; make sure the installation
support is rm.
4. Ware safety belt if the height of working is above 2m.
5. Use equipped components or appointed components dur-
ing installation.
6. Make sure no foreign objects are left in the unit after n-
ishing installation.
Electrical Safety Precautions:
7. Notes for Installation and Maintenance
Safety Precautions:
Important!
Please read the safety precautions carefully before
installation and maintenance.
The following contents are very important for installation
and maintenance.
Please follow the instructions below.
●The installation or maintenance must accord with the
instructions.
●Comply with all national electrical codes and local
electrical codes.
●Pay attention to the warnings and cautions in this
manual.
●All installation and maintenance shall be performed by
distributor or qualied person.
●All electric work must be performed by a licensed
technician according to local regulations and the
instructions given in this manual.
●Be caution during installation and maintenance. Prohibit
incorrect operation to prevent electric shock, casualty and
other accidents.
1. Cut off the power supply of air conditioner before
checking and maintenance.
2. The air condition must apply specialized circuit and
prohibit share the same circuit with other appliances.
3. The air conditioner should be installed in suitable
location and ensure the power plug is touchable.
4. Make sure each wiring terminal is connected firmly
during installation and maintenance.
5. Have the unit adequately grounded. The grounding
wire can’t be used for other purposes.
6. Must apply protective accessories such as protective
boards, cable-cross loop and wire clip.
7. The live wire, neutral wire and grounding wire of
power supply must be corresponding to the live wire,
neutral wire and grounding wire of the air conditioner.
8. The power cord and power connection wires can’t be
pressed by hard objects.
9. If power cord or connection wire is broken, it must be
replaced by a qualied person.
1. Avoid contact between refrigerant and re as it generates
poisonous gas; Prohibit prolong the connection pipe by
welding.
2. Apply specied refrigerant only. Never have it mixed with
any other refrigerant. Never have air remain in the refrigerant
line as it may lead to rupture or other hazards.
3. Make sure no refrigerant gas is leaking out when
installation is completed.
4. If there is refrigerant leakage, please take sufficient
measure to minimize the density of refrigerant.
5. Never touch the refrigerant piping or compressor without
wearing glove to avoid scald or frostbite.
Warnings
Refrigerant Safety Precautions:
Improper installation may lead to re hazard, explosion,
electric shock or injury.
Installation Safety Precautions:
Part Ⅱ: Installation and Maintenance
10. If the power cord or connection wire is not long enough,
please get the specialized power cord or connection wire
from the manufacture or distributor. Prohibit prolong the wire
by yourself.
11. For the air conditioner without plug, an air switch must
be installed in the circuit. The air switch should be all-pole
parting and the contact parting distance should be more than
3m.
12. Make sure all wires and pipes are connected properly and
the valves are opened before energizing.
13. Check if there is electric leakage on the unit body. If yes,
please eliminate the electric leakage.
14. Replace the fuse with a new one of the same specication
if it is burnt down; don’t replace it with a cooper wire or
conducting wire.
15. If the unit is to be installed in a humid place, the circuit
breaker must be installed.

15
Service Manual
Safety Precautions for Installing and Relocating the Unit:
Warnings
To ensure safety, please be mindful of the following precautions.
1. When installing or relocating the unit, be sure to keep the refrigerant circuit free from air or substances other than the
specied refrigerant.
Any presence of air or other foreign substance in the refrigerant circuit will cause system pressure rise or compressor rupture, resulting in
injury.
2.When installing or moving this unit, do not charge the refrigerant which is not comply with that on the nameplate or
unqualied refrigerant.
Otherwise, it may cause abnormal operation, wrong action, mechanical malfunction or even series safety accident.
3.When refrigerant needs to be recovered during relocating or repairing the unit, be sure that the unit is running in cooling
mode.Then, fully close the valve at high pressure side (liquid valve).About 30-40 seconds later, fully close the valve at low
pressure side (gas valve), immediately stop the unit and disconnect power. Please note that the time for refrigerant recovery
should not exceed 1 minute.
If refrigerant recovery takes too much time, air may be sucked in and cause pressure rise or compressor rupture, resulting in injury.
4.During refrigerant recovery, make sure that liquid valve and gas valve are fully closed and power is disconnected before
detaching the connection pipe.
If compressor starts running when stop valve is open and connection pipe is not yet connected, air will be sucked in and cause pressure
rise or compressor rupture, resulting in injury.
5.When installing the unit, make sure that connection pipe is securely connected before the compressor starts running.
If compressor starts running when stop valve is open and connection pipe is not yet connected, air will be sucked in and cause pressure
rise or compressor rupture, resulting in injury.
6.Prohibit installing the unit at the place where there may be leaked corrosive gas or ammable gas.
If there leaked gas around the unit, it may cause explosion and other accidents.
7.Do not use extension cords for electrical connections. If the electric wire is not long enough, please contact a local service
center authorized and ask for a proper electric wire.
Poor connections may lead to electric shock or re.
8.Use the specied types of wires for electrical connections between the indoor and outdoor units. Firmly clamp the wires so
that their terminals receive no external stresses.
Electric wires with insufcient capacity, wrong wire connections and insecure wire terminals may cause electric shock or re.
Safety Precautions for Refrigerant
●To realize the function of the air conditioner unit, a special refrigerant circulates in the system. The used refrigerant is the
uoride R32,which is specially cleaned. The refrigerant is ammable and inodorous. Furthermore, it can leads to explosion
under certain conditions. But the ammability of the refrigerant is very low. It can be ignited only by re.
●Compared to common refrigerants, R32 is a nonpolluting refrigerant with no harm to the ozonosphere. The inuence upon
the greenhouse effect is also lower. R32 has got very good thermodynamic features which lead to a really high energy
efciency. The units therefore need a less lling.
WARNING:
●Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacture.
Should repair be necessary,contact your nearest authorized Service Centre. Any repairs carried out by unqualied
personnel may be dangerous. The appliance shall be stored in a room without continuously operating ignition sources. (for
example:open ames , an operating gas appliance or an operating electric heater.)
●Do not pierce or burn.
●Appliance shall be installed, operated and stored in a room with a oor area larger than 4m (or 6m ).
●Appliance lled with ammable gas R32. For repairs, strictly follow manufacturer’s instructions only.Be aware that
refrigrants not contain odour.
●Read specialist’s manual.

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Service Manual
Safety Operation of Flammable Refrigerant
Qualication requirement for installation and maintenance man
●All the work men who are engaging in the refrigeration system should bear the valid certication awarded by the
authoritative organization and the qualication for dealing with the refrigeration system recognized by this industry. If it needs
other technician to maintain and repair the appliance, they should be supervised by the person who bears the qualication for
using the ammable refrigerant.
●It can only be repaired by the method suggested by the equipment’s manufacturer.
Installation notes
●The air conditioner is not allowed to use in a room that has running re (such as re source,working coal gas ware,
operating heater).
●It is not allowed to drill hole or burn the connection pipe.
●The air conditioner must be installed in a room that is larger than the minimum room area.
The minimum room area is shown on the nameplate or following table a.
●Leak test is a must after installation.
table a - Minimum room area(m2)
Maintenance notes
●Check whether the maintenance area or the room area meet the requirement of the nameplate.
— It’s only allowed to be operated in the rooms that meet the requirement of the nameplate.
●Check whether the maintenance area is well-ventilated.
— The continuous ventilation status should be kept during the operation process.
●Check whether there is re source or potential re source in the maintenance area.
— The naked ame is prohibited in the maintenance area; and the “no smoking” warning board should be hanged.
●Check whether the appliance mark is in good condition.
— Replace the vague or damaged warning mark.
Welding
●If you should cut or weld the refrigerant system pipes in the process of maintaining, please follow the steps as below:
a. Shut down the unit and cut power supply
b. Eliminate the refrigerant
c. Vacuuming
d. Clean it with N2 gas
e. Cutting or welding
f. Carry back to the service spot for welding
●Make sure that there isn’t any naked ame near the outlet of the vacuum pump and it’s well-ventilated.
●The refrigerant should be recycled into the specialized storage tank.
Filling the refrigerant
●Use the refrigerant lling appliances specialized for R32. Make sure that different kinds of refrigerant won’t contaminate with
each other.
●The refrigerant tank should be kept upright at the time of lling refrigerant.
●Stick the label on the system after lling is nished (or haven’t nished).
●Don’t overlling.
●After lling is nished, please do the leakage detection before test running; another time of leak detection should be done
when it’s removed.
Safety instructions for transportation and storage
●Please use the ammable gas detector to check before unload and open the container.
●No re source and smoking.
●According to the local rules and laws.

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Service Manual
●When installing or relocating the unit, be sure to keep the
refrigerant circuit free from air or substances other than the specied
refrigerant.
Any presence of air or other foreign substance in the refrigerant
circuit will cause system pressure rise or compressor rupture,
resulting in injury.
●When installing or moving this unit, do not charge the refrigerant
which is not comply with that on the nameplate or unqualified
refrigerant.Otherwise, it may cause abnormal operation, wrong
action, mechanical malfunction or even series safety accident.
●When refrigerant needs to be recovered during relocating or
repairing the unit, be sure that the unit is running in cooling mode.
Then, fully close the valve at high pressure side (liquid valve).About
30-40 seconds later, fully close the valve at low pressure side (gas
valve), immediately stop the unit and disconnect power. Please note
that the time for refrigerant recovery should not exceed 1 minute.
If refrigerant recovery takes too much time, air may be sucked in and
cause pressure rise or compressor rupture, resulting in injury.
●During refrigerant recovery, make sure that liquid valve and gas
valve are fully closed and power is disconnected before detaching
the connection pipe.
If compressor starts running when stop valve is open and connection
pipe is not yet connected, air will be sucked in and cause pressure
rise or compressor rupture, resulting in injury.
●When installing the unit, make sure that connection pipe is securely
connected before the compressor starts running.
If compressor starts running when stop valve is open and connection
pipe is not yet connected, air will be sucked in and cause pressure
rise or compressor rupture, resulting in injury.
●Prohibit installing the unit at the place where there may be leaked
corrosive gas or ammable gas.
If there leaked gas around the unit, it may cause explosion and other
accidents.
●Do not use extension cords for electrical connections. If the electric
wire is not long enough, please contact a local service center
authorized and ask for a proper electric wire.
Poor connections may lead to electric shock or re.
●Use the specied types of wires for electrical connections between
the indoor and outdoor units. Firmly clamp the wires so that their
terminals receive no external stresses.
Electric wires with insufcient capacity, wrong wire connections and
insecure wire terminals may cause electric shock or re.
To ensure safety, please be mindful of the following
precautions.

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Service Manual
Main Tools for Installation and Maintenance
1. Level meter, measuring tape
4. Electroprobe
7. Electronic leakage detector
10. Pipe pliers, pipe cutter
2. Screw driver
5. Universal meter
8. Vacuum pump
11. Pipe expander, pipe bender
3. Impact drill, drill head, electric drill
6. Torque wrench, open-end wrench, inner
hexagon spanner
9. Pressure meter
12. Soldering appliance, refrigerant container
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