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NOTICE
Midea water cooled packaged air conditioner is designed and manufactured
strictly based on relevant standard to ensure good performance, high reliability and
excellent adaptability.
Instructions on correct installation, debugging, operation and maintenance are
specified in this manual.
Please read this manual carefully before operating the unit.
The installation and debugging should be conducted by professionals. Our
company will be not responsible for the damage to machine or personal hurt caused
by incorrect installation, improper debugging and unnecessary maintenance which
are not specified in this manual.
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CONTENTS
Specification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Outline and Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Air Pressure Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installation of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Electric Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Installation of Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Installation of Water System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Working Condition and Description of Functions . . . . . . . . . . . . . . . . . . .16
Reparation and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Troubles and Shooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
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The illustrations and information in this manual are just for reference, please refer to the actual
product.
Manufacturer has the right to make amendment to drawing or technical parameter due to
improvement of product without notice.
SpecificationModel L60/S-C L80/S-C L100/S-C L120/S-C L135/S-C
Cooling capacity kW 60 75 97 117 133
Rated power kW 15.2 19.0 23.8 29.5 34.1
EER W/W 3.95 3.95 4.07 3.97 3.9
Rated current A 30.9 37.2 45.0 58.5 62.5
Power supply 380V 3N
50Hz
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Compressor
Type Hermetically sealed flexible scroll compressor
Starting method Direct staring
Outputpower
kW 3.094 4.04 3.096 8.03 9.533
Chilling oil Type Mineral oil
L 1.84 1.84 1.86 3.03 3.33
Refrigerant Type R22
kg 82 92 83 93 9.53
Fanmotor
Windmill 1 1 2 2 2
Motor kW 2.8 3.0 5.3 5.5 5.5
Drive Belt drive
Air flow m3/h 11000 14000 18200 20600 20600
External staticpressure
Pa 147 147 147 147 230
Cooled
waterside
Water flow m3/h 12.9 16.5 22.1 26.7 28.8
Waterpressure
Pa 9806 9806 9806 9806 9806
Pipe dia.Water inlet
mm/inch 65(2-1/2") 65(2-1/2") 65(2-1/2") 65(2-1/2") 65(2-1/2")
Pipe dia.Water outlet
mm/inch 65(2-1/2") 65(2-1/2") 65(2-1/2") 65(2-1/2") 65(2-1/2")
Water outlet,evaporator
mm/inch 25(1") 25(1") 25(1") 25(1") 25(1")
Water outlet, chassis mm/inch 25(1") 25(1") 25(1") 25(1") 25(1")
Height (before/afterpackaging)
mm 1839/2047 1839/2047 1839/2047 1839/2047 1839/2047
Length (before/afterpackaging)
mm 1420/1604 1420/1604 1912/2152 1912/2152 1912/2152
Width (before/afterpackaging)
mm 1055/1230 1055/1230 1055/1230 1055/1230 1055/1230
Net weight/grossweight
kg 690/723 700/733 820/870 830/880 840/890
Protection device Overcurrent protection, High/low pressure protection, Antifreeze protection, Internaltemp. protection of compressor, phase protection
High-pressureprotection
kgf/cm2 24 24 24 24 24
Low-pressureprotection
kgf/cm2 0.3 0.3 0.3 0.3 0.3
Noise dB(A) 66 66 74 74 75
Note: 1. Input power in Table 3 excludes that of motor of cooling tower and water pump.
2. 38 Working condition17 dry bulb temp. inlet water temp.33 relative
humidity30%95%.
3. Max. pressure of water system 1Mpa.
4. Test condition of nominal capacity: indoor dry bulb temp. 27 , wet bulb temp. 19 , outlet water
temp.35 , inlet water temp.30 .
Outline and Dimension
1. Dimension of L100120135/S-C
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Pressure gauge
Air outlet
Condensate outlet
Touch sc r een
Cooled water inlet
Emergency-relief outlet
Cooled water outlet
Air strainer
Installation hole4- 15
2. Dimension of L6080/S-C
Model A B C D E H W
L100/S-C 206 632 434 1055 482 1839 1912
L120/S-C 206 632 434 1055 482 1839 1912
L135/S-C 206 632 434 1055 482 1839 1912
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In s t al l at i on ho l e4 - 1 5
Pres s u re gauge
Ai r ou t l et
Coo l ed wat er ou t l et
Coo l ed wat er i n l et
Em ergency-re l i ef ou t l et
Ai r s t rai ner
Condens at e ou t l et
Touch s creen
Model A B C E H W
L60/S-C 235 558 1055 478 1839 1420
L80S-C 235 558 1055 478 1839 1420
Air Pressure Curve
6
147
Pa
10 m/h
L60/S-C(710turn)
L80/S-C(800turn)
L100/S- C(740turn)
L120/S-C( 810turn)L135/S-C( 910turn)
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Air pressure curve* refers to the working state of static pressure
Installation of Unit
A. Primary inspection
1. Relevant document: about installation location.
2. Installation location: Install the unit at the place where it is convenient for installing water pipe and
wiring. Keep the unit away from oil, smoke or other heat sources and make sure that the
noise and outlet air do not influence the surroundings.
3. Installation space: Keep a certain space for reparation and maintenance (see Fig. 1). Make sure
the air flow of heat exchanger on gas side is unblocked.
>1. 2m
>1. 2m
>1. 2m
>1. 2m
U n i t
Chart 1
4. Installation basement: Ensure that the unit is installed on concrete basement or metal bracket with
smooth surface which are solid and firm enough.
5. Delivery and inspection: Users should unpack and check the unit at the place of delivery.
a) Check whether all the accessories are all complete.
Item Quantity Remark
Installation, operation and
maintenance manual
Given to user
Users service manual Given to userb) Check the model and specification of unit.
c) Make sure the unit and the components thereof are intact and complete.
d) Check whether there is refrigerant leakage.
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If there is any problem, please contact us or our local dealer.
Note: Do not unpack the package after inspection; otherwise the unit may be damaged.
B. Carry the unit
1. Please handle with care while carrying the unit.
2. Carry the unit with crane or roller rather than by pushing.
3. Do not remove the wooden base until the installation of unit is completed.
4. Please lift the unit with hoisting equipment.
5. Cushion should be used lest the unit is damaged.
C. Location and space
The unit should be installed at horizontal steel or concrete basement which can support the weight of
unit.
Its forbidden to install the unit at damp, caustic or explosible place. If the unit is installed in the open
air where the temperature is low, our company will not responsible for antifreeze protection.
Keep a certain space for drainage, ventilation and maintenance, where it is convenient to remove the
compressor and condenser.
D. Noise control
For normal operation, we take the following measures to control noise:
1. Interior shockproof of compressor.
2. Adopt low-noise fan and the motor equipped with rubber shockproof cushion.
3. If there is an air return duct, a flexible pipe is necessary on site.
Partition the unit and pipe with wall or ceiling. For least influence by noise, please locate the unit at
the places away from users such as the location near staircase, elevator or restroom. Its suggested to
build a partition wall between the unit and the room, on such occasion, the door and window should be
well-tight and the air return device is needed in equipment room. For the noise can be transmitted into
the room, absorbing sponge should be put in the duct.
Electric installation
WARNING
Make sure the electric components accord with the following specification and relevant regulations:
Table 5
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Item
Model
Powersupply
Min diameter of powercordmm2
(Metal wiring with synthetic resininsulation)
Manual switchA
Leakageprotector
Power cord 30m
Grounding wire
Capacity
Fuse
L60/S-CL80/S-C 380V 3N50Hz 25 10 150 100 100mA
L100/S-CL120/S-CL135/S-C
35 16
Do not switch on power before completing installation, or danger may occur.
The unit should be correctly grounded according to electric regulation to avoid leakage.
A. Wiring of main power supply
1. Locate the switch control box of main power supply at proper place.
2. Fix an insulation washer through the power cord.
3. Connect the power, zero conductor and grounding wire with terminals in electric box.
4. Connect the wiring with terminals A, B, C and N.
5. The phase connection should be correct.
6. Keep the main power supply away from nonprofessionals to avoid misoperation.
Note: Please refer to the wiring chart when doing wiring work.
B. Control wiring connection
1. Control wiring connection of cooled water pump: Connect the terminals of AC contactors of
cooled water pump with terminals A5 and A6 as follows:
A5 A6
380V 3~
50HzWater
pump
AC contactor, cooled water pumpWorking voltage:220V~ 50Hz
Cooled water pump
2. Control wiring connection of fan of cooling tower: Connect the terminals of AC contactor of
cooling tower fan with terminals A7 and A8 as follows:
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50Hz380V 3~
A8A7Fan, cooling tower
Fan
AC co ntactor, cooling tower fanWorking voltage:220V~ 50Hz
Wiring Chart
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Transformer1
Transformer
2
Main
control
board
C N 2C N 3
D i s p l a yk e y b o a r dC N 2 C N 3
Current
check
board
2
right
CN21CN20
RT1
RT 4 RT3
CN23
CN26CN25
Cn24
3 H - p r oB l u e
3 L - p r o
2 L - p r o2 H - p r o
R e d1 H - p r o1 L - p r o
C N 4 9C N 4 8C N 4 7C N 4 6
CN18
CN31
CN34
CN9
CN7
CN4
CN6
CN38
CN14
CN8
CN13
CN12
CN5
CN43K
M3B
KM3A
KM2B
KM2A
KM1A
KM1B
KM4
N
3B
3A
2B
2A
1B
1A
4
Cooled
water
pump
Fan
cooling
tower
CN3
CN1
CN5
C N 4
CN2
Red
Blue
Current
ch
eck
board
1
left
C N 4
3N
50Hz
380V
~
Discription
of
symbols
Red
Blue(white)
Black
Red
White
Blue
Black
A8
A7
A6
A5
X
T2
N A B C
Magnetic
loop
2
circle
KM1B
KM2B
KM3A
KM3B
KM4
COMP1A
COMP1B
COMP2A
COMP2B
COMP3A
COMP3B
FAN
ABCN
L11,12,13,14,21,22,23,24
COMP1A,1B,2A,2B,3A,3B
FAN
RT1
RT2
RT3
RT4
1H-pro/1L-pro
2H-pro/2L-pro
3H-pro/3L-pro
XT1
2
L11
L12
L14
L21
L22
L23
L24
L14
L13
L12
L11
L21
L22
L23
L24
KM2A
L13
XT1
Main
power
cord
inlet
P
h
a
s
e
e
rro
r
E1
E2&1
unit
Indication
of
failure
Open
circuit
or
short
circuit
of
T1
E0
E2&2
unit
2 T
O
C
UR
RE
NT
C
HE
CK
B
OA
RD
R
T2
C
N22
M
odel
Remark
KM5
KM6
Provided
by
user
KM5
P
KM6
F
50Hz
380V
~3
50Hz
380V
3
PF
~
P Q 6P Q 5
P Q 4P Q 3
P Q 1
C N 5
B l u e
Y e l l o w
Y e l l o w
R e d
1 T
O
C
U
R
RE
NT
C
H
E
C
K
B
O
A
R
D
C
od
e
E2&3
unit
E5&1
unit
E5&2
unit
E5&3
unit
P0&1
unit
P0&2
unit
P0&3
unit
P1&1
unit
P2&1
unit
P3&2
unit
P4&2
unit
P5&3
unit
P6&3
unit
P9&1
unit
P9&2
unit
P9&3
unit
C
u
r
r
e
nt
t
r
a
n
s
f
o
r
m
e
r
Pressure
switch,No.3
unit(high/low
pressure)
A
C
c
o
n
t
a
c
t
o
r
C
o
m
p
r
es
s
o
r
m
o
t
o
r
I
n
d
o
o
r
f
a
n
R
e
t
u
r
n
a
i
r
t
e
m
p
.
s
e
n
s
o
r
E
v
a
p
o
r
a
t
o
r
p
i
p
e
t
e
m
p
.
s
e
n
s
o
r
,
N
o
.
1
,
2
a
n
d
3
u
n
i
t
Pressure
switch,No.2
unit(high/low
pressure)
Pressure
switch,No.1
unit(high/low
pressure)
Compressor
discharge
temp.protection
switch
4
-
p
h
a
se
t
e
r
m
i
n
a
l
M
o
t
o
r
,c
o
o
l
e
d
w
a
t
e
r
p
u
m
p
F
a
n
m
o
t
o
r
,
c
o
o
l
i
n
g
t
o
w
e
r
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Installation of Fan
RPM of fan depends on the air flow needed, accessories as well as resistance in air supply and return
ducts. Pulley and the specification of belt are determined according to RPM and power. Adjust the
resistance in air supply and return ducts after starting the motor to ensure even air flow in the room.
Force
Ruler
4keypoints
Make thebelt in proper tensity by adjusting the position of motor pulley and fan pulley. (See following
picture, press the belt and the distortion is about 20mm.) When stopping the pulleys, the time interval
between these two pulleys should be more than 7s.
Readjust the tensity of belt 1 week after the operation of unit. Check regularly every 1 to 2 months
and make sure the distortion should be about 20mm. Replace the belt when necessary.
Note: The belt which is too tight or too loose may generate noise and be harmful to the unit.
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Chart 2: Adjust the tensity of belt
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Installation of Water System
A. Water system with single unit
Maintenancevalve
ThermometerPressuregauge
Filling
valve
Coolingtower
ThermometerMaintenancevalve
Waterstrainer
Waterpump
Adjustingvalve
Drainvalve
Pipe joint
Pipe
joint
Pressuregauge
Installation schematic diagram (water system with single unit)
B. Water system with multi-unit
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Maintenancevalve
ThermometerPressuregauge
Pipejoint
Fillingvalve
Turnoff valve
Thermometer
Coolingtower
Waterstrainer
Waterpump
Maintenancevalve
Pipejoint
Pressuregauge
Adjustingvalve
Drainvavle
Installation schematic diagram (water system with multi-unit)
WARNING
Water pump and fan of cooling tower should be together controlled by the unit. High-pressure
protection will work in case water pump or cooling tower does not start.
In case the water pump and fan of cooling tower are not controlled by the unit, please make sure
that they are turned on before starting the unit.
Be sure that the unit is turned on if the water pump and fan of cooling tower are connected with the
unit.
The minimum distance between every unit should be 1200mm.
A maximum of 3 units can be paralleled connected in water system.
C. Precautions
C.1 Water pump
1. Water pump is installed in the inlet of condenser for the purpose of reducing resistance. The
suction port of pump should be close to water pool or cooling tower and the suction pipe should not be
too long.
2. Maintenance valve is fixed between suction pipe of pump andcondenser. Please use throttle
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valve rather than maintenance valve to adjust water flow.
3. Flexible pipe fixed on suction pipe and discharge pipe of pump can effectively reduce vibration
and noise caused.
4. Pressure gauge and thermometer should be installed at the place where it is convenient to get
the reading.
C.2 Cooling tower
1. Its suggested to install the cooling tower in shady, well-ventilated and unpolluted place.
2. Do not locate the cooling tower at air outlet or in the kitchen or the like places where the
temperature is high.
3. Check the structure and dimension of cooling tower to determine whether it is applicable. Take
into account the bearing capacity of floor and the noise level of cooling tower.
4. Either load or the ambient temperature should ensure constant water flow in condenser and
normal working state of every pressure valve and every sensor.
5. The cooling tower needs water constantly because the water inside keeps evaporating. The
amount of supplementary water is usually 1~3% of circulating water. The bottom of cooling tower should
be equipped with filling pipe and overflow pipe which can drain the filth into sewer.
6. Clean the water with cleaning agent and softening agent regularly to keep the water in good
quality. P-H value of water should be within 6~8 and the turbidity is less than 5mg./Litre. The content of
iron and CaCO3 should be less than 0.3mg/Litre and 50ppm respectively.
7. One cooling tower can be connected with a maximum of 3 units. When one unit is running, the
condensers and the switches of filling valve of other units should be turned off. Otherwise some
circulating water will pass through the unworking units, which may cause insufficient water or over high
water temperature in the working unit, reducing cooling capacity.
Working Condition and Description of Functions
A. Power supply
Voltage: rated voltage 380V, acceptable range: 343~418V.
Frequency: AC input frequency is 50Hz.
Electric control: working temperature: -748 ; humidity: RH40%~RH90%
B. Color LED display and operation instructions
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B.1 Description of LED icons
B.2 Operation instructions
1. ON/OFF
This button is used to turn on and turn off the air conditioner.
2. MODE
2.1 Two working modes can be selected: FAN and COOL
2.2 The mode will be changed by pressing this button. The corresponding icon of selected mode
will flash with the frequency of 2Hz. No operation within 3s, the unit will work on the selected
mode.
2.3 Following the item 2.2 can shift to the other mode.
3. ADJUST
3.1 : For increasing temperature.
The temperature will increase 1 once pressing this button. If keeps pressing more than 1s, the
temperature will increase with the rate of 1 /second. The highest temperature is 30 (no sound
by buzzer now).
3.2 : For decreasing temperature.
The temperature will decrease 1 once pressing this button. If keeps pressing more than 1s, the
temperature will decrease with the rate of 1 /second. The lowest temperature is 17 (no sound
16
stop
h
T5T1T2T3T4
FAN
COOL
STANDBY
SWING
FAULT
QUERY
LOCK
QUERYTIMERADJUSTMODEON/OFF
UnitTimer ON
Timer OFF
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by buzzer now).
4. TIMER
4.1 : For increasing the time.
The time will increase 1 hour once pressing this button. If keeps pressing more than 1s, the time
will increase with the rate of 1hour/second until it reaches 24 hours (no sound by buzzer now). If
no other operation within 6s, it will return to original state which can be shown from the display in
icon 88.
4.2 : For reducing the time.
The time will decrease 1 hour once pressing this button. If keeps pressing more than 1s, the time
will decrease with the rate of 1hour/second until it reaches 0 hour (no sound by buzzer now). If no
other operation within 6s, it will return to original state which can be shown from the display in icon
8.
4.3 If the time of Timer ON and Timer OFF is 0, the timer setting has been canceled.
5. QUERY
Following information will be displayed in sequence once pressing this button:
1) T1, icon QUERY is lightened;
2) T2 of No. 1 unit, icon QUERY is lightened;3) T2 of No. 2 unit, icon QUERY is lightened;
4) T2 of No. 3 unit, icon QUERY is lightened;
5) The latest failure code or protection code, icon QUERY is lightened.
6. LOCK
The icon will be lightened when pressing this button for the first time, which will be off for the
second time. When setting this function, other buttons are unavailable. (Note: This button is on the low
right side of the display which should be pressed with a needle.)
C. Description of LED display
1. When turn on the unit, icon Midea is lightened.
2. ON/OFF will be lightened and off as the unit is on and off.
3. Display of running mode:
1) Press MODE button and the corresponding icon will flash, which will keep lightened after 3s.
2) Description of mode icons:
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3) If failure occurs, the corresponding mode icon and icon FAULT are lightened, meanwhile the
failure code is displayed.
4. State of fan
As the fan is working, three-layer of light below logo Midea will flash with a certain frequency
circularly like a wave. It will be off as the fan stops.
5. Locking state
Icon is lightened when the buttons are locked and it will be off when they are unlocked.
6. Swing
Press and simultaneously, icon SWING will be lightened or off. As the fan is turned on,
the swing direction can be controlled; if the fan is turned off, this function is unavailable.
(Note: This function is reserved.)
7. Display of temperature
1) Instructions
No temperature display when selecting FAN mode.
2) When displaying temperature, the value of temperature will be displayed at the latter two
digits and the first digit will show whether this figure is positive or negative. ( for negative and
blank for positive). reflects that this figure is the value of temperature.
3) Icon 88 displays the set time, h shows that this figure is the value of time and the range is
0~24 hours.
4) For the situation of displaying protection or failure code, the first digit displays P (protection)
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or E (Failure), and the latter digit displays code 0~9.
8. Timer
1) Two functions: Timer ON and Timer OFF.
2) Pressing TIMER, the set time will be displayed on icon 88h.
3) The state of Timer ON and Timer OFF will be displayed in turn by alternating pressing the
button. Adjust the time through buttons and .
4) The range of set time: 0~24 hours.
5) Set the time via buttons and .
6) On Timer ON mode, the icon will be lightened when the unit is turned off. When it is time for
Timer ON, the unit will be turned on automatically. No pressing on and in 6 seconds,
the display at 888 will return to the original state.
7) On Timer OFF mode, the icon will be lightened when the unit is working. When it is time for
Timer OFF, the unit will be turned off automatically. No pressing and in 6 seconds, the
display at 888 will return to the original state.
D. Failure codes table
The failure codes will be displayed on the screen in case there is failure. You can find the
corresponding content of failure from following table.
Display Content of failure or protection
E0, icon FAULT is lightened Open circuit or short circuit of T1
E1, icon FAULT is lightened Phase error
E2 and No.1, icon FAULT islightened
Open circuit and short circuit of T2, No.1 unit (T2A)
E2 and No.2, icon FAULT islightened
Open circuit and short circuit of T2, No.2 unit (T2B)
E2 and No.3, icon FAULT is
lightened
Open circuit and short circuit of T2, No.3 unit (T2C)
E5 and No.1, icon FAULT islightened
System failure 3 times in 30 minutes, No.1 unit
E5 and No.2, icon FAULT islightened
System failure 3 times in 30 minutes, No.2 unit
E5 and No.3, icon FAULT islightened
System failure 3 times in 30 minutes, No.3 unit
P0 and No.1, icon FAULT islightened
T2 low-temperature protection, No.1 unit (T2A)
P0 and No.2, icon FAULT islightened
T2 low-temperature protection, No.2 unit (T2B)
P0 and No.3, icon FAULT islightened
T2 low-temperature protection, No.3 unit (T2C)
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P1 and No.1, icon FAULT islightened
Current protection, compressor 1
P2 and No.1, icon FAULT islightened
Current protection, compressor 2
P3 and No.2, icon FAULT is
lightened
Current protection, compressor 3
P4 and No.2, icon FAULT islightened
Current protection, compressor 4
P5 and No.3, icon FAULT islightened
Current protection, compressor 5
P6 and No.3, icon FAULT islightened
Current protection, compressor 6
P7, icon FAULT is lightened Current protection, indoor fan
P9 and No.1, icon FAULT islightened
Discharge temp. and high/low pressure protection,No.1 unit
P9 and No.2, icon FAULT islightened
Discharge temp. and high/low pressure protection,No.2 unit
P9 and No.3, icon FAULT islightened
Discharge temp. and high/low pressure protection,No.3 unit
Reparation and Maintenance
A. Ensure the water quality
The water from well and river which contains lots of solid particles, organic substances or scalelike
sediment should be filtrated or softened before they are used in condenser and evaporator. Otherwise,
the sand or mud in chilled water may block the pipeline. Please analyze the PH-value, conductivity, the
content of ammonia ion and sulfide ion and make sure they meet the following standard, if not, only
industrial water can be adopted.
ItemCooled water system Feature(1)
Circulating
water
Supplying water Corrosion Scalelike sediment
Standard requirement
pH (25 ) 6.5 ~ 8.2 6.0 ~ 8.0
Conductivity(mS/m) (25 )
{s/cm} (25 ) (2)80
(800)
30
(300)
Ion chlorine(Clmg/ l ) 200 50 Ion sulfate (SO42mg/ l ) 200 50
Acid consumption (pH4.8)(CaCO3 mg/ l )
100 50
Aggregate hardness (CaCO3mg/ l ) 200 70 Calcium hardness (CaCO3mg/ l ) 150 50 Silicon L (SiO2mg/ l ) 50 30 Referential standard
Iron content (Femg/ l )1.0 0.3
Copper content (Cumg/ l ) 0.3 0.1 Sulfide ion (S2mg/ l ) No detecting Ammonia ion (NH4+ mg/ l ) 1.0 0.1 Residual chlorine (Clmg/ l ) 0.3 0.3
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Dissociative cabonic acid (CO2mg/ l
)
4.0 4.0
Stability standard 6.0 8.0 -
Note: in the table above reflects the possibility of causing corrosion and scalelike sediment.
In case the water does not accord with the above standard, please consult the local dealer to
soften or filtrate the water.
B. Maintenance
1. Regular cleaning
Please check and clean the surface of condenser regularly.
1) Daily maintenance
Make sure the water in cooling tower is overflow.
2) Weekly maintenance
Replace with fresh water and ensure the water quality. Make sure there is no water leakage.
3) Monthly maintenance
Clean the surface on water side and supplying water system with a brush or detergent.
4) Quarterly maintenance
Do testing on water quality and replace with fresh water if necessary.
5) Air filter should be cleaned regularly.
Note: Remove the inside baffle first before cleaning the filter.
2. Turn off the unit in winter
Please make the inside and outside of casing clean and dry and drain the water from condenser as
well.
3. Starting in spring
Please follow the requirement below before starting the unit.
1) Examine and clean the unit.
2) Clean or replace the air filter.
3) Clean the condensate drainpipe.
4) Do cleaning on condensate pipe and check whether there is leakage.
5) Clear the dust on evaporator.
6) Make sure the impeller is in balance.
7) Fix all the electric wiring and lock the cover board.
C. Replace the components
If you need to replace the components, please consult the local dealer.
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Troubles and Shooting
Symptom Cause Treatment
Nonoperative (1)No power
(2)With power
1No electricity
1The fuse is melted
2Defective phase
3Incorrect phase
4Series circuit breaker works
5High-pressure switch is not reset
6Temp. sensor failure7Incorrect wiring
8 Loop on electromagnetic
contactor is burnt
9Voltage is too low
Notify the power company
Replace the fuse
Examine the power supply
Exchange the phase
Do reparation
Reset
Replace the temp. sensorDo reparation
Replace the contactor
Contact power company
Theunitstopssuddenly 1Discharg
e temp. switchprotection
2Insufficie
nt air flow,low-pressure
protection
3High-
pressure
protection
1Over high temp. on the surface ofcompressor and high degree ofsuperheat of refrigerant
2Insufficient refrigerant
3High air flow
1The belt is loose2Evaporator is too dirty
3Filter is too dirty
4Inappropriate duct design
5Air outlet is blocked
6Air return pipe is block
7Reversal running of fan motor
1 Insufficient capacity of cooled
water pump
2 Radiating fan of cooling tower
does not run
3Strainer of water pipe is blocked,
insufficient water
4Cooled water is too dirty
5Condenser is too dirty
6 Reversal running of fan motor of
cooled water pump
7 Reversal running of radiating
motor of cooling tower
8Water pump and cooling tower arenot started
Add refrigerant
Add refrigerant
Adjust the air flow
Adjust the belt
Do cleaning
Do cleaning
Replace the duct
Clear up the blockage
Clear up the blockage
Make adjustment
Replace the water pump
Do reparation or replacement
Clear the blockage
Replace with fresh water
Clean the condenser
Make adjustment
Make adjustment
Turn off and reset the unit
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Insufficien
tcoolingeffect
(1) Insufficient refrigerant
(2) Insufficient air flow
(3) Overload or insufficient capacity
(4) The system is blocked (insufficient
flow)(5) Improper setting of thermostat
(6) Over high temp. of return cooled
water
(7) Incondensable gas in system
(8) The filter is too dirty
Add the refrigerant
Examine and do reparation
Increase the capacity
Examine and do reparation
Adjust the setting
Examine and do reparation
Retreatment of system
Clean the filter
Thebodyofunitshakes (1) Defective installation
(2) The belt is loose
(3) The fan is unbalanced
(4) The iron for fixing the compressor is
not removed(5) Defective shockproof rubber of
compressor
(6) The rotating shaft of fan is bent
(7) The rotating shaft of fan motor is
bent
Reinstall the unit
Adjust the belt
Make adjustment
Remove the fixing iron
Replace the rubber
Replace the rotating shaft
Replace the rotating shaft of
motor
Abnormalnoise (1) Bearing of fan is damaged
(2) The belt is loose
(3) The fan contacts the casing of unit
(4) Pulley is loose
(5) Voltage is too low
(6) Iron core of electromagnetic
contactor gets rust
Replace the bearing
Adjust the belt
Make adjustment
Adjust and fix the pulley
Contact power company
Replace the contactor