water cooled package service new

8/4/2019 Water Cooled Package Service new

1/23

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.

1


2/23

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

2


3/23

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

3


4/23

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

4


5/23

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

5


6/23

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)


7/23

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.

7


8/23

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

8


9/23

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:

9


10/23

50Hz380V 3~

A8A7Fan, cooling tower

Fan

AC co ntactor, cooling tower fanWorking voltage:220V~ 50Hz

Wiring Chart

10


11/23

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

11


12/23

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.

12

Chart 2: Adjust the tensity of belt


13/23

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

13


14/23

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

14


15/23

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

15


16/23

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


17/23

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:

17


18/23

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)

18


19/23

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)


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)


System failure 3 times in 30 minutes, No.1 unit





P0 and No.1, icon FAULT islightened

T2 low-temperature protection, No.1 unit (T2A)


T2 low-temperature protection, No.2 unit (T2B)


T2 low-temperature protection, No.3 unit (T2C)

19


20/23


Current protection, compressor 1



P3 and No.2, icon FAULT is

lightened








P7, icon FAULT is lightened Current protection, indoor fan


Discharge temp. and high/low pressure protection,No.1 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

20


21/23

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.

21


22/23

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

22


23/23

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


Adjust the setting


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

water cooled package service new

Documents