Collection of various types of faults and troubleshooting methods for central air-conditioning!(Ⅰ)

Failure phenomenon

cause

elimination method

Fan does not turn

1. Power failure

2. Forgot to plug in the power

3. Low voltage

4. Wiring error or loose terminal

5. Motor failure

6. Poor capacitor

7. Poor switch contact

1. Find out the cause or wait for power recovery

2. Insert the plug

3. Find out the cause

4. Check the circuit with a multimeter and repair it

5. Use a multimeter to check, repair or replace

6. Replace

7. Repair or replace

The fan rotates but no air or low air volume

1. Abnormal power supply voltage

2. Reverse

3. There are obstacles in the tuyere

4. The air filter is blocked

1. Find out the cause

2. Change the wiring

3. Remove

4. Cleaning

The wind is not cold (or not hot)

1. There is air in the coil

2. The water supply cycle stops

3. The regulating valve is closed

4. The valve is blocked by foreign matter

1. Exhaust air from the exhaust valve

2. Check the water pump

3. Open the regulating valve

4. Take out the foreign body

Condensation on the outside of the case

1. Damaged internal insulation

2. The casing is burnt out when it comes into contact with the flame and the insulation layer

3. Leakage of cold air

4. There are indoor conditions that cause condensation

1. Repair

2. Do not touch the flame, re-wrap the insulation layer

3. Repair

4. Conditions for removing condensation

Foreign body blowing out

1. There is rust on the surface of the fan blade due to corrosion

2. The air filter is damaged and deteriorated

3. Damaged and degraded insulation materials

4. Too much dust in the unit

1. Replace the fan

2. Replace the air filter

3. Replace insulation materials

4. Clean the interior

Leakage

The wires are damaged or leaking

Repair line

Leaking

1. Poor installation

2. The drip tray is tilted

3. The drain is blocked

4. There is a leak in the water pipe

5. Condensate drips from the pipe

6. Poor installation at the joint

7. Forgot to close the exhaust valve

1. Horizontal installation of the unit

2. Adjust

3. Remove the blockage

4. Check and replace the water pipe

5. Check and re-heat insulation

6. Tighten after inspection

7. Close the valve

Fan does not stop after shutting down

1. Switch failure

2. Short circuit of control circuit

1. Repair or replace the switch

2. Check the circuit and eliminate the short circuit

Vibration and noise

1. Poor unit installation

2. Poor housing installation

3. No loosening of the fixed fan

4. There are foreign objects in the wind path

5. Fan motor failure

6. Damaged fan blades

7. Loose shutters at the air outlet

8. There is air in the coil

9. Frozen water (hot water) flows too fast

10. There is a lot of air entering the water

11. When using a quantitative valve, the differential pressure is too large

1. Reinstall and adjust

2. Reinstall

3. Fastening

4. Remove foreign matter

5. Repair or replace the motor

6. Replace

7. Fastening

8. Exhaust air

9. Check the flow rate of water

10. Remove air from water

11. Replace the appropriate valve

Poor effect of cold air (hot air)

1. The opening of the regulating valve is not enough

2. The coil is blocked and poor ventilation

3. There is air in the coil

4. Power supply voltage drops

5. The air filter is blocked

6. Insufficient water supply (cold and hot water)

7. Abnormal water supply temperature

8. Fan reverse

9. The air supply outlet and the return air outlet are obstructed

10. The front panel is not installed properly

11. Air short circuit

12. Uneven indoor wind distribution

13. Improper selection of equipment

14. Air leakage from the ceiling-mounted unit connection 15. Improper temperature adjustment

Room sunshine or window opening

1. Re-adjust the opening

2. Clean the coil

3. Exhaust air

4. Find out the cause

5. Clean the air filter

6. Adjust the water supply valve

7. Check the temperature of chilled water (or hot water)

8. Rewiring

9. Remove obstacles

10. Regular installation

11. Check that there are no obstacles at the air outlet

12. Check and adjust the tuyere

13. Redesign and selection

14. Repair

15. Re-adjust the air supply grade

16. Close windows and hang curtains

Failure phenomenon

cause

elimination method

The air supply parameters do not match the design values

1. The capacity of the air treatment equipment is too large or too small.

2. The thermal performance of the air handling equipment product cannot reach the rated value.

3. Improper installation of air handling equipment causes partial air short circuit.

4. Air leaks in the negative pressure section of the air conditioning box or duct, and untreated air leaks in.

5. The cooling and heating medium parameters and flow rate do not match the design value.

6. The water retaining effect of the retaining plate is not good, and the condensed water evaporates again.

7. The temperature rise of the fan and air supply pipeline exceeds the design value (the pipeline is not well insulated).

1. Adjust the parameters and flow of the cold and heat medium to make the air handling equipment reach the rated capacity; if it still does not meet the requirements, consider replacing or adding equipment

2. Check equipment, air ducts, eliminate short circuits and air leakage

3. Strengthen the insulation of wind and water pipes

4. Check and improve the water baffle of the surface cooler of the spray room to eliminate air leakage

Room temperature and relative humidity are both high

1. Insufficient cold output of the refrigerator.

2. Water spray is blocked.

3. Excessive air flow through the air handling equipment and poor heat and moisture exchange.

4. The return air volume is greater than the supply air volume.

5. Insufficient air supply (maybe the air filter is blocked).

6. The surface cooler is frosted, causing blockage.

1. Replace the freezer or overhaul the freezer equipment.

2. Clean the water spray system and nozzles.

3. Adjust the air flow through the processing equipment to make the wind speed normal.

4. Readjust the air volume of the return fan to make the room positive pressure.

5. Clean the air filter to make the air supply normal.

6. Adjust the evaporation temperature to prevent frosting.

Room temperature is suitable or low, relative humidity is high

1. The supply air temperature is low (maybe the secondary heating of the primary return air is not turned on or insufficient).

2. The spray chamber has a large amount of water and a large amount of moisture in the supply air (may be uneven or leaking water baffles).

3. The dew point temperature and moisture content of the machine may be high.

4. The room produces a large amount of humidity (such as increasing the humidity production equipment to flush the floor with water, air leakage, water leakage, etc.).

1. Use secondary heating correctly.

2. Repair or replace the water baffle and plug the air leakage.

3. Adjust the three-way valve to reduce the mixed water temperature.

4. Reduce moisture source.

Room temperature is normal, relative humidity is low

The outdoor air has a relatively low moisture content, and has not been humidified. It is only heated and sent into the room.

1. When spraying the water room, the circulating water should be sprayed continuously for humidification.

2. The surface cooler system should turn on the humidifier.

The measured air volume of the system is greater than the designed air volume

1. The actual resistance of the system is less than the design resistance, so the air volume of the fan increases

2. The fan capacity is too large when designing

1. The number of revolutions of the fan can be changed if possible

2. Close the small air volume control valve to reduce the air volume

The measured air volume of the system is less than the designed air volume

1. The actual resistance of the system is greater than the design resistance and the air volume of the fan is reduced

2. There is blockage in the system

3. System leakage

4. The output of the fan is insufficient (the fan cannot reach the design capacity or the impeller rotates in the wrong direction, the belt slips, etc.)

1. When conditions permit, improve air duct components to reduce system resistance

2. Check and clean up possible obstructions in the system

3. Blockage

4. Check and eliminate the factors that affect the output of the fan

The total air volume of the system does not match the total air volume, the difference is large

1. The air volume measurement method and calculation are incorrect

2. System leakage or short circuit

1. Review measurement and calculation data

2. Check plugging and eliminate short circuit

The dew point temperature of the machine has reached the requirement or is low, but the room temperature is slow

1. The air supply volume is less than the design value, and the number of air changes is small

2. There is a system with secondary return air, and the secondary return air volume is too large

3. There are many rooms in the air-conditioning system and uneven air volume distribution

1. Check whether the fan model meets the design requirements, whether the impeller steering is correct, whether the belt is loose, and open a large air supply valve to eliminate the factors of insufficient air flow

2. Adjust to reduce the secondary air return

3. Adjust to make the air volume of each room evenly distributed

The room air velocity exceeds the allowable velocity

1. The air outlet speed is too large

2. The total air supply is too large

3. The form of the air outlet is inappropriate

1. Increase the area of the air outlet or increase the number of air outlets, and open the large air outlet regulating valve

2. Reduce the total air volume

3. Change the form of the air outlet and increase the turbulence coefficient

The air velocity in the room is unevenly distributed, and there are dead spots

1. Poor consideration of airflow organization design

2. The air volume of the air supply outlet is not adjusted uniformly, which does not meet the design value

1. Adjust the position of the air supply outlet or increase the number of air supply outlets according to the measured airflow distribution diagram

2. Adjust the air volume of the air outlet to meet the design requirements

The air in the room is not fresh

1. Insufficient fresh air volume (the fresh air valve is not fully opened, the section of the fresh air duct is small, the air filter is blocked, etc.)

2. The number of personnel exceeds the design number

3. There are oxygen consumption factors such as smoking or burning indoors

1. Take symptomatic measures to increase the amount of fresh air

2. Reduce unnecessary personnel

3. It is forbidden to smoke and engage in non-compliant itching activities in air-conditioned rooms

The noise in the room is greater than the design requirements

1. The fan noise is higher than the rated value

2. The wind speed of the wind pipe, valve and tuyere is too high, causing wind noise

3. The noise reduction equipment of the air duct system is not perfect

1. Determine the noise of the fan, check whether the fan impeller touches the shell, whether the bearing is damaged, whether the vibration reduction is good, and treat it symptomatically

2. Adjust various valves and air outlets to reduce excessive wind speed

3. Add silencing elbow and other equipment

The cleanliness of the room does not meet the design requirements

1. The efficiency of the air filter does not meet the requirements

2. The dust in the equipment and air duct was not cleaned up as required during construction and installation

3. Operation management is not cleaned and cleaned as required

4. The production process does not meet the design requirements

5. The positive pressure in the room does not meet the requirements, and the outdoor dust infiltrates

1. Replace the unqualified filter equipment

2. Try to clean the dust in the equipment tube

3. Strengthen operation management

4. Improve process

5. Increase the number of air changes and positive pressure

Failure phenomenon

cause

elimination method

The pump does not absorb water, the pointer of the water outlet pressure gauge and the suction vacuum gauge swings violently

The water entering the pump is not enough, the suction pipe or seal is leaking

Tighten the screw plugs, seals and other leaks after repairing, vacuum or water injection

The pump does not absorb water, and there is a high vacuum before it absorbs water

The bottom valve is not opened, or is blocked, the water absorption resistance is too large, and the water absorption level is too low

Correct or change the bottom valve, clean or change the suction pipe, lower the pump position

The outlet pipe of the water pump is under pressure, but the pipe still does not flow

The resistance of the outlet pipe is too large, the direction of rotation is wrong, and the impeller is blocked

Check or shorten the water pipe and check the steering of the motor, remove the water pipe joint, and clean the impeller

Flow rate is lower than expected

The pump is blocked, the mouth ring is worn too much, and the pipe is too small

Clean the water pump and replace the big pipe, replace the mouth ring

The pump consumes too much power

The stuffing box is compressed too tightly, the stuffing box is heated or the mechanical seal is stuck, the impeller is loose, the impeller or the bearing is damaged, the water supply of the water pump increases

Check and replace the stuffing box or check the mechanical seal impeller, open a small outlet pipe valve to reduce the flow

Bearing overheating

Without oil, the water pump shaft and the motor shaft are not on the same centerline

Fill oil, align shaft center or change bearing

The internal sound of the water pump is abnormal, and the water pump does not supply water

The flow rate is too large, the resistance in the suction pipe is too large, the water absorption height is too large, there is air infiltration at the suction place, the temperature of the liquid being conveyed is too high, or the impeller sucks solid foreign objects

Open the small water outlet valve to reduce the flow, check the pump suction pipe, check the bottom valve, reduce the suction height, solve the air leakage, and lower the temperature of the liquid

Pump vibration

The pump shaft and the motor are not on the same centerline or the pump shaft is inclined. Check whether the bearing is damaged

Align the shaft center lines of the water pump and the motor, and check the bearings

Failure phenomenon

cause

elimination method

Does not start

1. Power failure

2. Forgot to plug in the power

3. Low power supply voltage

4. Wiring error, disconnection, loose connection terminal

5. Bad wiring terminals

6. Thermal relay action

7. Loose connection device

8. Loose terminals and open phase operation

9. Failure of blower motor

10. The transmission belt is disconnected

1. Check the reason and wait for the call

2. Insert the plug

3. Find out the cause

4. Check and repair the circuit

5. Fastening

6. Press the reset button

7. Inspection and repair

8. Fasten the terminals

9. Repair or replace the motor

10. Replace the transmission belt

Cooling capacity is not strong

1. The selection is not matched and the capacity is too small

2. The fan does not run and there is no wind

3. Bearing wear

4. Shaft breakage

5. The angle of the blower blades is wrong, and the motor load is too large

6. Damaged fan blades

7, the transmission belt is loose

8. Too much circulating water

9. Insufficient circulating water

10. Short circuit of exhaust air

11. Inhale the hot air

12. Insufficient air intake

13. Circulating water drift

14. Filling material plug

15. The hole of the dispersing tank is blocked

16. The diffuser is blocked

1. Redesign and select

2. Check the power supply and wiring

3. Replace

4. Replace

5. Adjust the blade angle

To

6. Replace

7. Replace

8. Adjust the water supply valve and turn it off

9. Adjust the water supply valve and open it

10. Remove faulty obstacles

11. There should be no heat source around the cooling tower

12. Check air roads

13. Sweep the dispersion tank and adjust the opening of the inlet valve

14. Cleaning

15, cleaning

16. Replace

Reduced circulating water during operation

1. The spray pipe of the spray tank is blocked

2. The water supply pipe is blocked

3. The valve of the water supply pipe is not fully opened

4. Insufficient water supply pressure

5. The water pump is not matched and is too small

6. Unreasonable pipeline design and small pipe diameter

1. Cleaning

2. Clear

3. Fully open the water supply valve

4. Find out the cause and adjust the pressure

5. Replace the water pump

6. Reconfiguration

More water brought out during operation

1. Too much circulating water

2. Bias flow of circulating water

3. Excessive air volume

4. The fan does not match and is too large

1. Regulating valve

2. Sweep the dispersion tank and adjust the opening of the inlet valve

3. Check the fan and impeller

4. Replace

Water overflows in the water tank during operation

1. The water tank is blocked

2. There is a lot of circulating water, and scattered water drips from above

3. The structure of the water tank is unreasonable

1. Clean up

2. Adjust

3. Repair

Vibration and noise during operation

1. The shaft of the blower is bent

2. Shaft damage of the blower

3. Damage to the bearing

4. Foreign matter in the bearing

5. Bearing lack of oil

6. The blade screws are loose

7. The fan blade collides with other parts

8. The connection part of the cooling tower shell is loose

9. The voltage is too low and the motor makes an abnormal sound

1. Replace

2. Replace

3. Replace

4. Disassembly and cleaning

5. Come on

6. Fastening

7. Repair

8. Inspection and repair

9 find out the cause

During operation, the fan motor overheated

During operation, the fan motor overheated

1. Install at the correct angle

2. Replace

3. Disassembly and cleaning

4. Come on

5. Replace after inspection

6. Use high temperature motor

7. Measure the voltage to find out the cause

8. Replace

9. Fasten the terminals

During operation, the cooling water pump sucks in air

1. Lower water level in the sink below

2. The filter is blocked

1. Find out the cause and replenish water

2. Cleaning

The filling material is polluted, and the circulating water is also polluted

1. Inhale the smoke

2. Inhale the polluted air around

3. Poor effect of water treatment device

1. Move the cooling tower or eliminate the flue gas

2. Eliminate environmental pollution

3. Repair water treatment equipment

Condenser type

advantage

Disadvantage

Scope of use

Water-cooled

1. Vertical shell and tube type

2. Horizontal shell and tube type

3. Casing type

4. Immersive

1) It can be installed outdoors in the sky, saving the area of the computer room

2) Easy to clean

3) Easy to find ammonia leakage

1) Compact structure

2) Good heat transfer effect

3) The temperature difference between the inlet and outlet of the cooling water is large, and the water consumption is large

1) Simple structure and convenient manufacturing

2) Small size and compact

3) Good heat transfer performance (water and refrigerant flow in reverse)

1) Simple manufacturing

2) Easy maintenance and cleaning

3) Unrestricted installation place

1) The heat transfer coefficient is lower than the horizontal shell and tube type

2) The cooling water inlet and outlet temperature difference is small, and the water consumption is large

1) Inconvenient cleaning

2) Ammonia leakage is not easy to find

1) Large metal consumption

2) Large flow resistance of cooling water

3) Difficult to clean scale

1) The flow rate of cooling water in the water tank is very low, so the heat transfer effect is poor

2) Large size

Medium and large ammonia refrigeration plant

Large, medium and small ammonia and Freon refrigeration devices can be used

Small Freon air-conditioning refrigeration unit 

Small freon refrigeration device

Air cooling water type (air cooling type)

No need for cooling water, very suitable for areas with difficult water supply, such as refrigerated trucks

1) Poor heat transfer effect

2) When the temperature is high, the condensation pressure will increase

Large, medium and small Freon refrigeration devices and air conditioners can be used

Water spray

1) Easy to manufacture

2) Easy to clean

3) Ammonia leakage is easy to find and maintenance is convenient

1) Large metal consumption

2) Large area

3) The heat transfer effect is worse than the shell and tube type

Medium and large ammonia refrigeration plant

Evaporative

1) Low water consumption, about 1/25-1/50 of the water consumption of shell and tube type

2) Compact structure, small size, small footprint

1) High cost

2) To increase pumps and fans, consume a certain amount of electricity

3) Trouble cleaning dirt and maintenance

Types of

Excellent point

Missing points

Use range

Evaporator for cooling liquid refrigerant

The open refrigerant evaporates in the tube

Riser

The vapor that the refrigerant evaporates in the neutral tube type quickly leaves the heat transfer surface, and the heat release coefficient on the refrigerant side is larger

Large metal consumption, processing man-hours, high cost, low flow rate on the water side, affecting heat transfer

Ammonia refrigeration system ice pool or cold water tank

Spiral tube

The heat transfer system is 12%-18% higher than that of the vertical tube type, the steel is 15% less than the vertical tube type, and the processing time is reduced by 40%

Difficulty in repairing when leaking

Ammonia refrigeration system ice pool or cold water tank

Snake coil type

Simple structure, convenient processing, safe work

Low flow rate of refrigerant in the box, poor heat transfer

Small freon device

Closed

Flooded shell and tube

The structure is simple, the area is small, the weight is light, and the consumption of metal materials is small. Because it is a closed system, the salt water is not in contact with the air, so it is less corrosive to the pipe.

The processing is more complicated, the welding quality requirements are high, the heat capacity is small, and the thermal stability is poor. When the salt water concentration is reduced, it is easy to freeze and cause the pipe tissue rupture accident

Ammonia refrigeration system, not suitable for marine use

Dry shell and tube

Compact structure, using aluminum core inner fin tube, good heat transfer effect, K value can reach 1163-1395W/㎡·K refrigerant is not easy to freeze, because the shell is equipped with baffle, the water speed can be as high as 1m/s , The oil return problem in Freon can be solved

There is a gap between the baffle, the shell and the tube, so that the refrigerant runs short and affects the heat transfer effect.

The assembly process of the baffle is more complicated, and it is difficult to clean the outside of the tube

As a water cooler in Freon refrigeration equipment

Evaporator for cooling air

Evaporation pipe

Vertical wall pipe

It is easy to process and make, the ammonia gas after evaporation is easy to draw out and the heat transfer effect is good

The large amount of liquid filling and the influence of liquid column pressure increase the refrigerant evaporation temperature at the bottom of the pipe

Suitable for wall pipes in cold storage of ammonia refrigeration system, not suitable for system

Snake coil

Convenient processing and production, small filling volume, about 50% of the volume of the coil, can be used as wall pipe or pre-pipe

Since each coil circuit is longer, about 120m, the refrigerant gas after the vapor is not easy to discharge, which reduces the heat transfer effect

Wall pipes and jacking pipes of ammonia and freon refrigeration equipment

U-shaped top pipe

The liquid supply circuit is short, the ammonia gas is easily drawn, and the heat transfer effect is good

If the position of the whole group is not level, it is easy to cause uneven liquid supply. When a liquid supply pipe is connected in parallel with several pipes, when the flow rate is small, uneven frosting will occur

Pipe jacking of ammonia refrigeration system, not suitable for Freon system

Shelf evaporator

Good heat transfer effect, uniform temperature

A large amount of steel is consumed, and the labor intensity of entering and leaving the warehouse when freezing food

Small ammonia and freon freezing device

Air cooler

Ceiling air cooler

Compact structure, small footprint, can be automated

If the defrosting water is not handled well, it will splash on indoor food or indoor floor. Poor air organization will cause uneven temperature difference in the room

Freezing room of ammonia refrigeration equipment, low temperature refrigerating room, high temperature storage room, refrigerating room of Freon refrigeration equipment

Floor-standing air cooler

Convenient installation, easy discharge of defrosting water, simple operation and maintenance, after installing the air duct, the indoor temperature is uniform

Large area

Freezing room and cold storage room of ammonia and freon refrigeration equipment

Wet air cooler

Simple structure, no frost, good heat transfer effect, stable temperature

The air flow resistance is large. If it is sprayed with salt water, the concentration will be reduced due to contact with the air. It is necessary to add salt frequently and is highly corrosive to the pipe.

Air conditioning system

Hybrid air cooler

Compact structure, no frost, good heat transfer effect

Salt water is highly corrosive to pipes

Air conditioning system

Failure phenomenon

cause of issue

Inspection Method

elimination method

No action when energized

Lead or coil open

Touch the solenoid valve by hand, check whether there is AC vibration, or stop and remove the lead wire, and use a multimeter to measure whether the passage

Connect the lead or rewind to replace the coil

There is a buzzing sound after power on

1. The moving iron core is jammed or damaged

2. Assembly error

3. There is more oil in the system, which hinders the action of the valve core

4. The voltage is lower than 85% of the rated value, the electromagnetic force is insufficient

5. The pressure difference between the inlet and outlet of the solenoid valve exceeds the valve opening capacity, and the iron core cannot be sucked up

1. Listen to whether there is a falling impact sound, if there is no impact sound, vibration and temperature rise, it means that the circuit is normal and the moving iron core is blocked.

2. Disassemble and check the position of each part

3. Remove and inspect

4. Measure voltage with a multimeter

5. Measure the pressure of the high pressure and low pressure section of the refrigeration system. See if the pressure difference meets the solenoid valve opening ability

1. Eliminate the jamming factor or replace the iron core

2. Disassemble the solenoid valve and reassemble it, especially the ten parts on the magnetic isolation conduit, which must be assembled in order to avoid affecting performance

3. Remove and clean

4. Adjust the power supply voltage

5. Eliminate factors such as small amount of cooling water, poor condenser heat dissipation, excessive non-condensable gas in the refrigeration system, etc., so that the high and low pressures are in a normal state

Lax closure

1. Damaged valve seat

2. The valve needle is roughened

3. The stolen goods make the valve not closed tightly

4. The pressure guiding orifice is blocked, the top pressure cannot be properly balanced, the resistance at the bottom of the piston increases, and the piston moves down and the piston cannot be pressed tightly on the valve seat.

5. The spring force is too small

To

6. The flow direction of the solenoid valve is opposite to the flow direction of the medium

The lax closure caused by any factor can be determined by the following methods:

1. Stop the compressor and observe the pressure in the low pressure section. If it is higher than the normal value, make the compressor work. After working for a period of time (it is better to reach the set stop temperature), stop the machine, and immediately close the liquid storage bottle infusion valve and observe the low pressure. Whether the segment rebound is too high, if it is not too high, it means that the solenoid valve is not closed tightly

2. The compressor works for a period of time. When the high and low pressure enters the normal state, stop immediately, touch the solenoid valve from time to time to see if it feels cold, and listen carefully for the sound of refrigerant shot at the solenoid valve. Lax

3. Disassemble the solenoid valve and filter for inspection

4. Visually inspect after disassembling the solenoid valve

5. Check the spring shape and free length

6. Check whether the arrow direction of the solenoid valve points to the expansion valve

1. Replace or repair the valve seat

2. Trim, polish or replace

3. Clean the valve filter, if the filter is damaged, it should be repaired, if the filter mesh is too thick, add another layer in the filter

4. Clean the solenoid valve and dredge the pressure guiding hole. If it is confirmed that it is correct, the pressure guiding hole can be enlarged by about 0.1mm. If the expansion does not work properly, the small hole should be riveted

5. To replace or rewind the spring, the original spring should be properly elongated in time

6. Put the solenoid valve into the system in one direction

Not shut down when power off

1. The moving iron core is stuck

2. Residual magnetism attracts moving iron core

Remove the solenoid valve, hold the moving iron core with a hand, and then push the iron core up to the dead point, let go to see if the residual magnetism can attract the moving iron core

1. Eliminate jamming factors

2. Try to demagnetize or replace with new materials

Medium leakage

1. The gasket is damaged

2. Uneven force on fastening screws

3. Weld leakage of magnetic isolation casing

1. Observe whether the gasket is damaged at the leakage of the medium

2. Tighten the screws with a screwdriver and test the tightness of the screws

3. Remove the magnetic isolation sleeve to observe whether there are oil traces on the outside

1. Tighten the screws or replace the washers

2. Loosen all screws and tighten again

3. Use brazing to repair leaks or replace new pipe sleeves

Failure phenomenon

cause of issue

Maintenance method

Float valve cannot open or close

1. There are welding slag, iron filings, rust mud and other garbage stuck in the system.

2. The floating ball itself has small holes, or the solder is corroded, causing the floating ball to leak and will not shut down.

3. The floating ball has been used for a long time, and the cylindrical valve body is seriously worn and can not be closed.

1. Install the filter and inspect and clean it regularly.

2. After the sand hole is welded, the blasting structure is changed to an electric welding structure.

3. Renew the cylindrical valve

Insufficient float

The cylindrical valve hole is not smooth enough, or the valve is oval or conical

Reaming holes with a reamer to make the finish and geometric shape accurate

The floating ball connecting rod is separated from the cylindrical valve, causing the floating ball to pass through, causing serious temperature stroke of the compressor

Adjust the split pin at the screw, the pin falls off during work

Reinstall the split pin after disassembly and inspection

The float ball falls, causing severe wet stroke

The manufacturing quality of the connecting rod is not good, the stress is concentrated, and the force screw is broken when it is too full

Re-manufacturing the connecting rod with tougher steel