Công ty con của MOON-TECH,
Since 1956

After-sales service

 

Yantai moon (Vietnam) Co., Ltd. rely on the experience of Yantai moon china 60 years refrigeration system solution and 10 years Vietnam localization to provide the follow service for customer:

1、Project planning：

We can design the whole factory planning for customer and help customer to choice processing equipment according to the customer requirement.

2、One stop service center:

Technical consultation:

According to the customer demands, we will provide project design, as well as refrigeration equipment, processing equipment and warehouse equipment model selection and supplier recommendation service.

Freezing IQF tailoring design:

According to the customer foods freezing demands, our technical design department will provide IQF tailoring design.

After service spare parts center:

In our Vietnam factory have a spare part store center for after service. When customer have spare parts requirement, we can supply as soon as possible.

Logistics and Transportation:

Yantai Moon (Vietnam) have 10 years’ experience for logistics and transportation to Asian, South American and so on.

Installation and commissioning:

We have a qualified team responsible for engineering installation and whole management for each of your project. We can provide installation guidance, equipment testing and commissioning, as well as turnkey project.

3、Equipment maintenance:

Screw compressor maintenance points:

Components inspection cycle

No.

Component

Inspection cycle

 

Remarks

Three months

Six months

One year

Three years

1

Shaft seal

“O”ring

 

clean

change

 

 

Sealing surface

 

clean

Disassemble and inspect

 

 

Oil sealing sleeve

 

 

Disassemble and inspect

 

 

Shaft seal cavity

 

clean

 

 

 

 

Bearing

Master bearing

 

 

 

Disassemble and inspect

 

Thrust bearing

 

 

 

Disassemble and inspect

Change per 40,000 hours

dummy piston and cylinder

 

 

 

Disassemble and inspect

 

 

 

Inner

Capacity control

O shape ring

 

 

 

change

 

 

Magnetic valve wire mesh

 

clean

 

 

 

2

Master motor

See specifications

3

Shaft coupling

coaxiality

inspect

 

 

 

 

Bolt and nut

Inspect and fasten

 

 

 

 

 

Other inspection items see shaft coupling specifications

4

Oil separator filter element

Change when pressure difference exceeds 0.1MPa

5

Oil cooler

Water cooling

Shell gas release

 

Inspect and descale

 

According to water quality and fouling conditions

Refrigerant cooling

Pipeline and oil shell gas release

 

 

 

 

 

 

6

Oil pump

Shaft sleeve

 

 

 

change

 

Shaft seal

 

change

 

 

 

bearing

 

 

 

Disassemble and inspect

Change per 40,000 hours

sleeve bearing coupling

 

 

change

 

 

7

Oil filter

Suction filter

Blow-down filter

O ring

 

 

change

 

Change when cleaning wire mesh

Wire mesh

 

 

 

 

Clean on set time

8

Safety valve

 

 

verify

 

 

9

manometer

sensor

 

 

verify

 

 

10

pressure、pressure difference controller

verify

 

 

 

 

11

Foundation bolt

fasten

 

 

 

 
                   

Common failures, causes and remedies

     Failures

  Causes

Remedies

Compressor can’t be started up normally

 
  1. capacity isn’t adjusted to “0” position                              
  2. coaxiality of the compressor and motor surpass the tolerance
  3. oil or liquid refrigerant in compressor
  4. abrasion and burn inside the compressor
  5. power off, low voltage (below rating 10％) or electric failure
  6. improper regulation of pressure controller or temperature controller,which make the contact open frequently
  7. pressure difference controller or thermorelay doesn’t reset after disconnection
  8. master motor coil burns or short circuit
  9. coils of potentiometer, contact device, intermediate relay burn or poor contact
  10. improper regulation of temperature controller or　open failure of the magnet valve
  11. false connection of the wires in electric control cabinet or instrements box
  12. over high pressure in the units。
  1. discharged to “0”position
  2. calibrate the coaxiality
  3. rotate the coupling joints of the compressor to drain the liquid
  4. disassembly and repair
  5. debugging, supply power according to     requirement
  6. adjust the contact position according to the requirement

 

 

 

  1. press reset key

 

  1. overhaul
  2. disassembly and repair

 

  1. adjust the preset values or change  temperature controller

 

  1. overhaul and correct

 

(12)open the equalizing valve

Suddenly stop during  the operation
  1. pressure difference protection of the suction filter
  2. high pressure relay works due to overhigh discharge pressure
  3. temperature controller is adjusted too low or malfunction
  4. overload of the master motor causes the thermorelay works or fuses broken
  5. pressure difference controller works due to too low oil pressure

(6) failure of controlling circuit

(7) instrument terminal loses or poor contact

(8) oil temperature relay works due to over high oil temperature

(1) find causes and repair

 

(2) find causes and repair

 

(3)adjust temperature control scope and change temperature controller

(4) find causes and change fuse

(5) find causes and repair

(6) find causes and repair

(7) fasten after inspection

(8) add the cooling water in the oil cooler

Big vibration of the unit
  1. foundation bolts not yet fastened
  2. coaxiality of the compressor and master motor surpass the tolerance
  3. the units and pipelines produce resonance

(4)over volume refrigeration oil or liquid refrigerant sucked in
  1. fill in tightly or adjust the pad
  2. realign the coupling unit
  3. adjust the supporting point of the pipeline

(4) stop the compressor, and rotate the coupling joints to drain the liquid

Abnormal sound during operation

(1)foreign matters in the compressor

(2)thrust bearing woren out and broken

(3)sliding bearing woren out and rotor abrases with machine shell

(4)coupling joints loosen

(1)overhaul compressor and suction filter

(2)change

(3)change slidding bearing and overhaul

(4)check coupling joints

Discharge temperature is too high

(1)abnormal abrasion of the compressor

(2)insufficient oil injection inside the machine

(3)over high oil temperature

(4)degree of superheat is too high in gas suction

(1)inspect the compressor

(2)adjust oil injestion volume

(3)add cooling water in the oil cooler to lower oil temperature and check the refrigerant flow

(4)open liquid supply valve properly and to increase liquid supply volume

Over high temperature of compressor body

(1) over high suction temperature

(2) heat by components friction

(3)cooling capacity of oil cooler insufficient

(4) insufficient oil injection

(5)compressor burns due to foreign matters

(1) adjust throttle valve properly

(2) stop compressor and inspect

(3) increase the cooling water volume（liquid ammonia）to lower the oil      temperature

(4) increase oil injection volume

(5)stop compressor and inspect

 

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