AC 690 Service Eng

7/25/2019 AC 690 Service Eng

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9206171 Rel. 2 02/07

AC650PRO/AC690PRO

SERVICE MANUAL


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_____________________________________________________________________ AC650PRO/AC690PRO

SERVICE MANUAL 1

INDEX

1.0 - GENERAL RULES FOR MAINTENANCE 3

1.1 - Working environment 4

2.0 - SPARE PARTS 5

3.0 - OPERATING PRINCIPLE 10

3.1 - Recovery 10

3.2 - Oil drain 12

3.3 - Vacuum and recycle (simultaneously) 13

3.4 - Vacuum test 15

3.5 - Recycle 16

3.6 - Oil replenishing 17

3.7 - Charge 18

3.8 - Replenishing compressor oil 19

3.9 - Discharge of non condensable gases 20

3.10 - Dye injection 21

4.0 - DISPLAYED MESSAGES 22

4.1 - Service messages 22

4.2 - Error messages 22

5.0 - EVACUATION OF THE TOOL 23

6.0 - TROUBLESHOOTING AND DEFECT ANALYSIS 24

6.1 - The station does not recover 24

6.2 - The station does not pull the vacuum 26

6.3 - The station does not perform recycle 27

6.4 - Non condensable gases are not discharged 28

6.5 - The station does not recycle 28


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2 SERVICE MANUAL

7.0 - COMPONENTS CHECK AND MAINTENANCE 29

7.1 - Pump 29

7.2 - Pressure transducer P1 30

7.3 - Safety pressure gauge P2 31

7.4 - Expansion valve 31

7.5 - Filter dryer change 32

7.6 - Reset counter filter dryer 33

7.7 - Vacuum pump oil change 34

7.8 - Reset oil counter vacuum pump 34

7.9 - Refrigerant scale calibration 35

7.10 - Transducer calibration 36

7.11 - Oil replenishing scale calibration 39

7.12 - Oil purge scale calibration 40

8.0 - TEST AND PARAMETERS SELECTION 41

8.1 - LCD test 41

8.2 - Outputs test 41

8.3 - Inputs test 428.4 - Helium test 43

8.5 - Printer test 43

8.6 - Counters 43

8.7 - Service printing 44

8.8 - Oil discharge 44

8.9 - Parameters modification 45

8.10 - Software update 48

9.0 - DIAGRAMS 49

9.1 - Flow diagram 49

9.2 - Power card 50

9.3 - Display card 51

9.4 - Flow diagram components description 52

10.0 - GLOSSARY OF TERMS 54


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SERVICE MANUAL 3

1.0 - GENERAL RULES FOR MAINTENANCE

It is necessary to wear suitable protections such as goggles and gloves, thecontact with the refrigerant can cause blindness as well as other injuries to theoperator.

Avoid the contact with the skin, the low boiling temperature (about -30 C) mayprovoke freezing.

Do not inhale refrigerating gases fumes.

Before connecting the AC650PRO/AC690PRO unit to an A/C system or to anexternal tank, make sure all the valves are closed.

Before disconnecting the AC650PRO/AC690PRO unit, make sure the cycle has been

completed and all the valves are closed thus avoiding to disperse the refrigeratinggas in the air.

Do not modify the safety valves and the control systems calibration.

Do not use tanks or other storing containers which are not type-tested or withoutsafety valve.

Never charge any container beyond 85% of its capacity, explosion risks may arise.

Never leave the unit live if an immediate use is not scheduled, stop the electricalsupply before a long period of unit inactivity or before internal maintenanceinterventions.

Be careful while servicing the unit since connecting hoses may contain pressurisedrefrigerant.

Extraordinary maintenance interventions have to be performed by authorised staffonly.

Pressure of leaks of the HCF-134a service equipment or of the air conditioningsystems of the vehicle must not be tested by using compressed air. Someair/HCF-134a mixtures can burn at high pressures. These mixtures can bedangerous and may cause fires or explosions and subsequent injuries or damages.

Further information on the operators health and safety can be obtained from therefrigerant producers.


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4 SERVICE MANUAL

1.1 - Working environment

The unit has to work in a sufficiently ventilated environment.

ATTENTION:

Work far from free flames and hot surfaces; at high temperatures therefrigerant decomposes freeing toxic and aggressive substanceswhich are noxious for the user and the environment.

For a correct functioning the unit has to work on an even surface; do not drop norbump it.

Do not subject the AC650PRO/AC690PRO unit to dripping.

ATTENTION:

While operating do not disperse the refrigerant in the environment.Such a precaution, besides being required by the international rulesfor the environment protection, is necessary to prevent the possiblepresence of refrigerant in the working environment from making itdifficult to detect possible leaks.

Work in environments with sufficient lighting.

Avoid inhalation of the refrigerants and oils in the A/C systems. Exposure maycause irritation to eyes and the respiratory tract. To remove R134a from the

A/C system, use only the special recycling-units for R134a. If the refrigerant isaccidentally released into the atmosphere, ventilate the work area before resumingservice.

Do not use the unit under direct sunrays; sun exposure can cause excessivetemperatures and malfunctioning. Working temperatures indicated refer to the unit

being not directly exposed to the sun.


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SERVICE MANUAL 5

2.0 - SPARE PARTS

1. Red hose tank 5117418

Blue hose tank 1450 mm + O'RING SL31407

2. Yellow hose 600 mm + O'RING SL31408

3. 244 cm High side red hose 5117474

4. High side quick coupler RA18191A

5. 244 cm Low side blue hose 5117475

6. Low side quick coupler RA18190A

7. O'RING Kit for quick couplers RA19150

1 2

3

4

5

6

7


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6 SERVICE MANUAL

8. Vacuum pump oil 0,45 l RA13119B

Vacuum pump oil 0,95 l RA13203B

Vacuum pump oil 3,8 l RA13204B

9. Piston for solenoid valve 4,5 mm 5125014

Piston for solenoid valve 2,5/3 mm 5125015

10. Tank adapting coupler 5117228

11. Tank quick coupler 5117226

12. Joints for 1/4SAE hoses RA40083

13. O'RING 3037 14 1107031

O'RING 2031 11 1107004

O'RING 10078 10 1107060

O'RING 2018 8 1107006

10

8 9

1111

12 13


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SERVICE MANUAL

24

22

15

16

21

19

23

28

29

26

30

31

27

20

18

17

25

40

35

36

37

42

39

38

41

34 33

32

46

43

44

45

47

14


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8

14. AC650PRO Frontal thermoform 0643165

AC690PRO Frontal thermoform 0643165TM

AC650PRO Sticker 3602525

AC690PRO Sticker 3602617

SPX ROBINAIR Sticker 3602474

15. Printer 2657040

Power supply cable for printer 2303283

Serial cable for printer 2303284

Roll of printer paper 5607069

16. Front panel 0111296

17. Inside tank pressure meter (M3) 1601033

18. Low side gauge (M1) 1601035

19. Display card 2659269/C

Display card with Cyrillic characters 2659269RUS

20. High side gauge (M2) 1601034

21. Red handle 5111022

22. Blue handle 5111023

23. Pressure meters capillary tube 511740624. Dashboard valve 5117400/1

25. Expansion valve (3) 5117398

26. Filter dryer (F2) 5117399

27. Drying filter strap 5109062

28. Filter-compressor pipe 5117467

29. 4,5 mm Solenoid valve 3109094

30. Still SL31382

31. Complete ventilated exchanger SL31372

Radiator support square 0109524

Exchanger 5117449

Fan 3127032

32. Oil charge cell SL31411

33. Vacuum pump (2) 183 l/min 3127033

34. Compressor (6) SL31310

35. Mechanical filter (F1) 5117468

36. Solenoid valves set SL31420

Protection unidirectional valve 5117473

37. Coil 220 Vac AC350/500-3

38. Pressure transducer(P1)

Peak suppressor

39. Check valve Kit

40. Safety pressure gauge (P2)

41. Pipes side thermoform

42. Power card

43. Union tee44. Uncondensate discharge valve

45. Cylindrical gear reducer

46. Tank security valve

47. Double profile for AC Robinair

48. AC650PRO Rear thermoform

AC690PRO Rear thermoform

49. 20 Kg Storage tank (7)

50. Oil injection assembled bottle

51. Dye assembled bottle

52. Oil discharge assembled bottle

53. Bottle loading cell

54. Bottles side thermoform

55. 1/8 F L-shaped coupler

56. 1/8 M Straight coupler for pipe

57. Male quick coupler

58. Female quick coupler

59. Straight coupler for pipe 6


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SERVICE MANUAL 9

60. Main power switch 3113125

61. Power cable 3119125

62. False HP quick coupler 5117311

63. False LP quick coupler 5117312

64. Wheel locking seeger 5109061

65. Rear wheel 0107025

66. Front wheel 0107026

60

62

63

61

646566


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10 SERVICE MANUAL

3.0 - OPERATING PRINCIPLE

This chapter presents all of the operating stages. It also presents passage flows insidethe charge station by means of the flow diagram and a short description of activecomponents in each single function.

3.1 - Recovery

The recovery is the function allowing to eliminate refrigerant from the vehicle A/Csystem.

Connect the two service hoses T1(low side) and T2(high side) to the A/C system ofthe vehicle and open the relevant valves on quick couplers: the contained refrigerantreaches M1and M2and LOWand HIGHvalves.

Open the two LOWand HIGHvalves and the refrigerant reaches the EV10and EV3solenoid valves (usually closed) and gets in contact with the P1 pressure transducer.The P1 pressure transducer checks for the presence of refrigerant in the car

A/C system.

Press the recovery key to start the function and the ecu excites the EV10, EV3andEV5solenoid valves by opening them and starting compressor 6.Now the refrigerant passes through the EV10, EV3and EV5 solenoid valves, the F1filter and the expansion valve 3to reach the still/separator 4.

The expansion valve keeps the compressor inlet pressure constant to enable the bestperformance.Inside the still/separator 4, the recovered oil from the vehicle A/C system is separatedfrom the refrigerant.

Inside still-separator the refrigerant continues its flow through the filter/drier F2, issucked by the compressor, conveyed into the second still/separator 5and then storedinto the tank.

The filter/drier F2is used to remove from refrigerant humidity particles before storageinto the tank, while the second still/separator 5 is used to separate refrigerant fromcompressor oil of recharge station.

When pressure on the P1 pressure transducer drops under the value set by thesoftware, the function stops automatically. The program waits for 5 minutes to checkpossible pressure increases and, if necessary, restarts a second cycle.

At the end of these phases EV10, EV3, EV5solenoid valves and compressor 6 areclosed.


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SERVICE MANUAL 11

The flow diagram below highlights the refrigerant flow inside the charge station duringthe recovery function.

M2

HIGH

LOW

P1T1

T2

EV5

EV3

EV6

3 F1

C

P2

HP

5

VU2

6

F2

9

4

EV710

7

V1

8

V3 V2V4

V6V5

M1

M3

EV10

P

2

EV1

VU3

11

12

1

VU1

13

EV8EV9


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12 SERVICE MANUAL

3.2 - Oil drain

This operation is performed at the end of recovery and is necessary to know theamount of new oil to add to the vehicle A/C system before recharge.

Open solenoid valve EV7and, by drop effect, oil on the bottom of the still/separator 4passes inside the graduated tank 9.

The scale 13, weighs the discharged oil and the electronics stores the value for thesubsequent charge phase.

P

2

EV1

13

EV9

11

VU3

EV8

12

VU1

1

M2

HIGH

LOW

P1T1

T2

EV5

EV3

EV6

3 F1

C

P2

HP

5

VU2

6

F2

9

4

EV710

7

V1

8

V3 V2V4

V6V5

M1

M3

EV10


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SERVICE MANUAL 13

3.3 - Vacuum and recycle (simultaneously)

The service station is set so that during the vehicle A/C system vacuum a refrigerantrecycle occurs too to favour non condensable gases discharge and obtain a purerrefrigerant before recharge.

Vacuum

The vacuum function allows to vacuum the vehicle A/C system.Connect the two service hoses T1 (low side) and T2 (high side) of the vehicle A/Csystem, open relevant valves on quick couplers: the A/C system is not incommunication with the recharge station.

Open LOWand HIGHvalves to start communication between the vehicle A/C system

and pressure transducerP1.

If pressure on the sensor is lower than the value set by the software, an electric signalis sent to the ecu thus enabling the vacuum function; on the contrary, if pressure ishigher the message CIRCUIT FULL PROCEED RECOVERY is displayed indicatingthat there is refrigerant inside the vehicle A/C system.

Solenoid valves EV1, EV3and EV10are now closed.Press the vacuum button to start the function; the ecu excites the EV10 and EV1solenoid valves by opening them and starting the vacuum pump 2.

Pump starts sucking and eliminating gas residues and humidity from the system andprepares it for recharge.

The vacuum pump has a capacity of final vacuum equal 0,066 mbar and stops at theend of the set vacuum time.

Recycle

During the vacuum function, the refrigerant recycle starts automatically to furtherimprove its purity before the recharge.

Some seconds after the vacuum stage has started, the ecu excites the EV5and EV6solenoid valves by opening them and starting compressor 6.

In that way, refrigerant is sucked from storage bottle 7and is conveyed through thefilter F1, the expansion valve 3, the still/separator 4until reaching the tank again, as ithappens in the recovery stage.

This function favours the automatic discharge of non condensable gases inside the

storage bottle.


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14 SERVICE MANUAL

P

2

EV1

13

EV8

12

VU1

1

EV9

11

VU3

EV5

EV3

EV6

3 F1

C

P2

HP

5

VU2

6

F2

9

4

EV7 10

7

V1

8

V3 V2V4

V6V5

M1

M3

EV10

M2HIGH

LOWP1T1

T2


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SERVICE MANUAL 15

3.4 - Vacuum test

At the end of the vacuum phase the vacuum test is started.In this phase LOWand HIGHvalves are open while EV1solenoid valve close for theleak test.

All other components are disabled. The system indicates a error to the operator, if thesystem pressure during the vacuum test exceeds the value set by the software.

The check is carried out through the P1transducer.

M2

HIGH

LOW

P1T1

T2

EV5

EV3

EV6

3 F1

C

P2

HP

5

VU2

6

F2

9

4

EV710

7

V1

8

V3 V2V4

V6V5

M1

M3

EV10

P

2

EV1

13

EV8

VU1

1

EV9

12

VU3

11


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16 SERVICE MANUAL

3.5 - Recycle

The recycle function can be started without starting vacuum by using a special menufunction; the operation is the same as described before.

M2

HIGH

LOW

P1T1

T2

EV5

EV3

EV6

3 F1

C

P2

HP

5

VU2

6

F2

9

4

EV710

7

V1

8

V3 V2V4

V6V5

M1

M3

EV10

P

2

EV1

11

VU3 VU1

12

1

EV8EV9

13


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SERVICE MANUAL 17

3.6 - Oil replenishing

After evacuating the vehicle A/C system, recovered oil has to be replaced with new oil.The oil replenishing occurs by pressure difference.

During evacuation, both valve on the service hose T2 quick coupler and HIGHvalveremain open.

This section of the circuit is hence under vacuum; when opening EV8solenoid valve,the pressure difference makes new oil in the graduated bottle 1be sucked inside thevehicle A/C system.

After entering the amount of oil to be charged the oil is charged automatically by theunit through the electronic scale 12.

EV5

EV3

EV6

3 F1

C

P2

HP

5

VU2

6

F2

9

4

EV710

7

V1

8

V3 V2V4

V6V5

M1

M3

EV10

P

2

EV1

11

VU3 VU1

12

1

EV8EV9

13

M2

HIGH

LOW

P1T1

T2


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18 SERVICE MANUAL

3.7 - Charge

The charge function enables to charge refrigerant inside the A/C system.

Press the charge function button and set the amount of refrigerant to be charge into

the vehicle A/C system, the ecu excites the EV3and EV6 solenoid valves by openingthem.

The refrigerant leaves the bottle through V4and V2valves, passes through EV6andEV3solenoid valves, the HIGHvalve (in case of high side charge) and reaches the A/Csystem of the car through the T2service hose.

After charging the set amount of refrigerant, the recharging station stops the chargeautomatically; the automatic stop is controlled by the ecu thanks to the signals sent bythe loading cell of the electronic scale 8.

EV5

EV3

EV6

3 F1

C

P2

HP

5

VU2

6

F2

9

4

EV710

7

V1

8

V3 V2V4

V6V5

M1

M3

EV10

P

M2

HIGH

LOW

P1T1

T2

2

EV1

11

VU3 VU1

12

1

EV8EV9

13


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SERVICE MANUAL 19

3.8 - Replenishing compressor oil

During the recovery and recycle functions, a part of the recharge station compressor oilis pulled out of compressor and has to be replenished.

This oil is separated from the refrigerant inside the still/separator 5 and thenreplenished inside compressor 6.

EV5

EV3

EV6

3 F1

C

P2HP

5

VU2

6

F2

9

4

EV710

7

V1

8

V3 V2V4

V6V5

M1

M3

EV10

P

M2

HIGH

LOW

P1T1

T2

2

EV1

11

VU3 VU1

12

1

EV8EV9

13


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20 SERVICE MANUAL

3.9 - Discharge of non condensable gases

This is an automatic function that allows to eliminate non condensable gases from thestorage tank.

During recycle and recovery pressure increases inside the storage bottle.

If non condensable gases are present the pressure increases is higher than usual thuscausing the opening of the non condensables vent valve and their purge through theV6valve.

EV5

EV3

EV6

3 F1

C

P2

HP

5

VU2

6

F2

9

4

EV710

7

V1

8

V3 V2V4

V6V5

M1

M3

EV10

P

2

EV1

11

VU3 VU1

12

1

EV8EV9

13

M2

HIGH

LOW

P1T1

T2


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SERVICE MANUAL 21

3.10 - Dye injection

Before the charge, the A/C system can be charged with a special dye for leak detection.By selecting the dye injection option, the software opens the solenoid valve EV9 forsome seconds, so that the dye in bottle 11reaches the A/C system.

The opening time of the solenoid valve is set to allow the charge of the correct amountof dye.

11

VU3 VU1

12

1

EV8EV9

13

M2

HIGH

LOWP1T1

T2

EV5

EV3

EV6

3 F1

C

P2

HP

5

VU2

6

F2

9

4

EV710

7

V1

8

V3 V2V4

V6V5

M1

M3

EV10

P

2

EV1


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22 SERVICE MANUAL

4.0 - DISPLAYED MESSAGES

4.1 - Service messages

CHANGE OILVacuum pump oil change (see chapter 7.7).

CHANGE FILTERChange filter dryer (see chapter 7.5).

4.2 - Error messages

HIGH PRESSUREOut feed pressure from compressor is excessively high. Switch off the unit and wait for

about 30 minutes. If the problem persists, apply to the Technical Service.

SOFTWARE ERRORError in the software, apply to the Technical Service.

FULL BOTTLECoolant level in the bottle reached the maximum capacity level, carry out some chargesto reduce the amount of coolant inside.

SCALE RECALIBRATIONError in scale calibration, reset it. If the error persists, apply to the Technical Service.

HIGH RECOVERY TIMEThe recovery time exceeds the set safety limit. Make sure there are no leaks in the A/Csystem. If no leaks are detected, apply to the Technical Service.

EMPTY SYSTEMThere is no refrigerant in the A/C system.

BOWL FULLThe oil discharge bowl is full and has to be drained.

BOWL EMPTYThe oil injection bowl is empty and has to be charged.

FULL SYSTEMThe A/C system is charged with refrigerant.

INCOMPLETE CHARGEExcessive charge time; this proves that the pressure inside the bottle is equal to thepressure inside the A/C system.

OIL CHARGE TIME HIGHThe A/C system is not under vacuum and the station cannot suck oil.


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SERVICE MANUAL 23

5.0 - EVACUATION OF THE TOOL

Before any repair intervention, evacuate, by means of another machine, the tool fromrefrigerating gas it contains. Such operation prevents the accidental outflow of gas.To carry out this operation:

ATTENTION:

For your safety, always wear gloves when working with refrigerant.Contact with refrigerant may injure eyes. Disconnect circuits andhoses cautiously. Circuits and hoses may contain refrigerant underpressure. Do not aim hoses and circuits to anyone.Always disconnect the tool form the main supply before removing anycasing or starting any service job.

Be sure the high and low side hoses (T2and T1) are not connected to the vehicle.

Open LOWand HIGHvalves.

Carry out a recovery.

Wait for the function end.

NOTA BENE:In case, due to the malfunction of the compressor, the recovery cannot be performed,connect a external station to the T1and T2services hoses, start the recovery to openconnected SV and carry out recovery by means of the external station.

Close both liquidV2andV4valves and vapourV1andV3valves on the tank anddisconnect all hoses from the tank.

Connect the blue liquid hose to the low side of the handheld manifold set. Connect

the red vapour hose to the high side of the same manifold set. Connect the centralhose of the manifold set to the recovery inlet of another tool.

OpenV1andV2valves.

Open both valves on the manifold set and recover refrigerant form the tool. Afterrecovery is completed, wait for two minutes to see whether pressure rises to thezero. Repeat the last phase until eliminating pressure completely.

Close both valves on the manifold set and disconnect hoses form the bottle.


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24 SERVICE MANUAL

6.0 - TROUBLESHOOTING AND DEFECT ANALYSIS

This chapter presents a short description of the defect types and the components thatmay cause it.

ATTENTION:

Before any type of maintenance intervention, depressurise the stationto avoid gas outflows (see chapter 5.0).

6.1 - The station does not recover

If the compressor works:

Disconnect high and low side service hoses from the A/C system of the vehicle andlet the recovery station HIGHand LOWvalves open.

If pressure on pressure gauges drops during the SELFCLEANING phase, check ifEV3 and EV5 solenoid valves aren't supplied. If they are supplied replace theboard, if they are not supplied replace or clean solenoid valves since it means theyare leaking.

If pressure on pressure gauges does not drop, check if EV10, EV3 and EV5solenoid valves are supplied. If they are supplied replace the faulty solenoid valve,

otherwise replace the electronic board.

NOTA BENE:

During the SELF-CLEARING phase the pressure on the manifolds does not shift sinceEV3and EV5solenoid valves are closed.

If pressure on pressure gauges drops slowly:

Be sure the F1mechanical filter is not obstructed (clean by compressed air).

Be sure theVU2unidirectional valve is operating.

Be sureV1andV3valves are correctly open.

Be sure the pressure adjuster 3 is correctly calibrated to a 2 to 2,3 bars value,connect a pressure gauge to the special service coupler on the adjuster.

Check the compressor 6correct operation.


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SERVICE MANUAL 25

If the compressor does not work:

Check for the presence of 12 Vdc on the compressor relay coil.

Check status of fuses F2and F3(8 A delayed) located on the power board.

Check for the operation of compressor at the pressure of the recovery functionkey. In case of malfunctioning replace the battery or the electronic board.

Check for the presence of 220 Volts on the compressor relay outlet pins. If there isno voltage replace the defective board.

Check the value of the absorbed current if the compressor is supplied(voltage reaches compressor). If the current value is 0 A or higher than 6 A, thecompressor has to be replaced.

If the FULL BOTTLEmessage is displayed:

Check the thank weight and drain the contents in case it is full (for instance carryout some charges).

If the HIGH PRESSUREmessage is displayed:

Make sure valves V1, V2, V3 and V4 on the tank are open and hoses areconnected.

Check the high pressure gauge contacts P2. If pressure is less than 14,5 bars,there must be continuity between pin 1and 2while pin 1and 4are open, when14,5 bars are exceeded contacts between pin 1and 2open while those betweenpin 1and 4close. If the gauge does not reflect this situation or its three pins areshorted, replace it. If the gauge works correctly check harnessing cables or theelectronic card.

If the gauge works correctly the cause of the error message can be the obstructionof the refrigerant flow to the tank. Check the operation of the one-direction valve

VU2and make sure hoses are not obstructed.

If the CHANGE FILTERmessage is displayed:

Replace the filter and zero the counter (see special chapter).

If the message is still present after filter replacement, replace the electronic card.


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26 SERVICE MANUAL

The station completes the recovery but pressure on gauges does not decrease:

Make sure valve son tank V1, V2, V3 and V4 and HIGH and LOW valves areopen.

Be sure the P1pressure transducer works correctly.

If the message RECALIBRATE THE SCALE is displayed, it means that the software,containing a safety value to prevent the bottle filling in case of mis-calibration of thescale, has intervened by displaying such message. In this case it is necessary:

To calibrate the scale; if the problem remains replace the loading cell or theelectronic board.

6.2 - The station does not pull the vacuum

If the pump works but does not pull the vacuum in the A/C system of the vehicle carryout following:

Check LOWand HIGHvalves of the recharge station are open.

Check the plastic hose connected to the pump is well linked on both sides and thatit is not obstructed.

Check the correct level of oil in the vacuum pump, oil has to be even with thereservoir sight glass on the pump side while the latter. Replace oil if necessary.

Check the pump induction is correct (the pump reaches a vacuum degree equal0,066 mbar), if induction is good, replace the pump.

Remove the pump protection casing and make sure the supply cables are correctlyconnected.

Check the EV1 and EV10 vacuum solenoid valve are live and work correctly.

If they are live replace the defective solenoid valve, if they are not live checkconnection cables or replace the electronic board.


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SERVICE MANUAL 27

If the message FULL SYSTEMis displayed:

Check on pressure gauges of the charge station M1and M2the inlet pressure, if itexceeds 0,3 bar, carry out a recovery before pulling the vacuum.

If pressure on charge station gauges M1 and M2 is lower than 0,3 bar, checkpressure transducer P1(see chapter 7.2).

If the problem persists replace the electronic card.

Check pressure calibration on the electronic board (see chapter 7.10).

If the vacuum pump does not work:

Check if pump is connected to the supply.

Check the status of F2and F3(8 A delayed) fuses on the electronic board.

Be sure there is 220 Volt voltage on the pump, if voltage is present be sure thereis not too much oil in the pump; if there is too much oil, drain some of it andrestart the pump. If it does not work replace the pump.

Be sure there are 12 Vdc on the pump relay coil; be sure are 220 V on the outletcontacts. In case one of the two voltages is absent, replace the electronic card.

6.3 - The station does not perform recycle

Check whether hoses are connected correctly to the tank and that valves V1,V2,V3andV4are open.

Be sure the EV7oil drain solenoid valve is not leaking.

Be sure the mechanic filter F1 are not obstructed, otherwise clean them with

compressed air.

Check theVU2unidirectional valve correct operation.

Check the correct calibration of the pressure adjuster 3.

Make sure the refrigerant flow line is not obstructed, if necessary clean it.

If compressor does not work make sure there is supply voltage on compressor. Ifthere is no voltage check if supply cables and compressor relay work correctly.


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6.4 - Non condensable gases are not discharged

Check the correct operation of theV6automatic vent valve.

6.5 - The station does not recycle

Make sure all hoses are connected correctly to the tank and valvesV1,V2,V3andV4are open.

Make sure LOWand HIGHvalves on service station are open.

Check for scale calibration.

Be sure the board accepts the set weight for the charge; if it does not accept it, besure the bottle contains enough coolant for the charge.

Be sure the EV6and EV3charge solenoid valves are live. If they are live replacethem since they are defective, if they are not live check the connection cables andthe electronic board; replace if defective.

Make sure the electronic scale is not locked.


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7.0 - COMPONENTS CHECK AND MAINTENANCE

7.1 - Pump

Technical features

Type:

Oil-bath type pump

Oil capacity:

500 cc. Approx.

Type of oil:

ROBINAIR special oil

Voltage:

230 V

Induction:

183 l/min

Vacuum:

0,066 mbar of absolute pressure equal 50 micron

To check the pump correct operation:

Make sure there is enough oil in the pump (it has to be even with the line on thepump sight glass).

Apply on the induction port a vacuum meter to display the reached vacuum value.

Start the pump and check if it reaches a vacuum degree of 0,066 mbar equal50 micron.

NOTA BENE:

For the good operation of the pump oil has to be replaced every 10 operating hours.


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7.2 - Pressure transducer P1

To check the transducer:

Be sure on pins 1() and 2(+) there are 24 Vdc of supply. If there is no voltage

check and if necessary replace the electronic card.

Be sure on pins 1() and 3(+s.) there is the outlet signal. The outlet ranges from0 Vdc to 10 Vdc.

For the transducer (SL31314) 0 bar / 10 absolute bars (-1 bar / +9 relative bars),this means that 1,00 Vdc = 1,000 bars. If the manometers display 3 relative bars(4 absolute bars), the voltage shall have to be 4 Vdc.

For the transducer (SL31410) 0 bar / 16 absolute bars (-1 bar / +15 relative bars),

this means that 1,00 Vdc = 1,600 bars. If the manometers display 3 relative bars(4 absolute bars), the voltage shall have to be 2,5 Vdc.

NOTA BENE:

In case of replacement use the special glue to apply the new transducer.


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7.3 - Safety pressure gauge P2

The pressure gauge is usually closed between contacts 1 and 2 and usually openbetween contacts 1and 4, it opens at 14,5 bar. To check the gauge:

Connect a service hose to a source tank.

Close the two valves on the storage tank.

Apply a pressure gauge to the red hose connecting the tank.

Start recovery.

When pressure reaches 14,5 bar the recovery has to stop and the messageHIGH PRESSUREhas to be displayed.

Slightly discharge pressure on the tank by the valve on the tank vapour side beforeresetting unit.

NOTA BENE:

In case of replacement use the special glue to apply the new gauge.

7.4 - Expansion valve

Is calibrated to a 2 to 2,3 bars value, and keeps the valve outlet pressure constant.To check the valve:

Connect the low side service hose to the coupler under the pressure adjuster,through the supplied adapter.

Let the HIGHand LOWvalves closed.

Start recycle function (the tank shall contain at least 4 Kg of refrigerant).

After about ten minutes, pressure should range 2 to 2,3 bar.


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7.5 - Filter dryer change

The filter dryer on this unit is conceived to trap acid and particulates and is formulatedto remove water from the refrigerant.

You must change the filter dryer to assure adequate moisture and contaminantremoval.

You can recycle up to 150 Kg of R134a. To help you know when you have reached thatpoint, the unit displays the warning message CHANGE FILTER thus inviting theoperator to replace the filter dryer.

To change correctly the filter dryer, follow carefully these instructions.

Connect the unit to the electrical power supplied and press the RECOVERY key.

Open the high and low pressure valves on the unit.

Wait for the end of self-cleaning.

Let the compressor operate until the pressure indicated on the manometers hasnot decreased under the 0 (zero) bar value.

Press the STOP key to stop the compressor. Now all the refrigerant has beendrained from the filter and no pressure should be present.

Close the valves on the unit.

Disconnect the unit from the electrical power supply and remove the lower frontpanel.

ATTENTION:

During the following phase it will be necessary to open the refrigerantcircuit of the unit. Wear goggles and gloves.

Disconnect the filter with caution and replace it with a new one. For bettertightness grease oil seals.

ATTENTION:

Check the correct positioning and the wear of grommets.

Set up the plastic protection again.


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7.6 - Reset counter filter dryer

After the change of the filter dryer, reset the counter.To reset the counter follow carefully these instructions:

Simultaneously press the 3and FLUSHINGkeys for some seconds.

The display shows the message 0000.

Digit 5555on the keypad and press ENTER.

The functions menu is displayed.

Press the upwards cursor shifting key or the downwards cursor shifting key toselect either FILTER CHANGEand press ENTERto confirm.

The display displays a value, either in Kg or in Pounds, corresponding to the amount ofcoolant that has been filtered.

Press the MULTIFUNCTIONkey and keep it pressed.

When the display shows 0000release the MULTIFUNCTIONkey.

The display displays the functions menu again.

Press STOPto go back to the STAND-BY page.


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7.7 - Vacuum pump oil change

The oil of the vacuum pump must be changed frequently in order to assure higherperformances of the unit.When the oil has to be changed, the display shows CHANGE OIL.

To change the oil, follow carefully these instructions:

Disconnect the unit from the power supply.

Put a beaker under the cap, open the cap and discharge the oil contained in thevacuum pump.

When the pump is empty, screw in the cap and open the upper cap.

Fill the pump with the oil through the upper hole. Check the oil level in the pump

through the inspection glass; level has to reach the sight glass middle line.

When the pump is filled, close the upper cap.

7.8 - Reset oil counter vacuum pump

After having changed the oil of the vacuum pump, reset the counter.To reset the counter follow carefully these instructions:


The display shows the message 0000.



Press the upwards cursor shifting key or the downwards cursor shifting key toselect either OIL CHANGEand press ENTERto confirm.

The display shows a value which corresponds to the working hours of the vacuumpump.

Press the MULTIFUNCTIONkey and keep it pressed.

When the display shows 0000release the MULTIFUNCTIONkey.




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7.9 - Refrigerant scale calibration

Required equipment:

2 Sample weights.

After removing the rear cover, remove the container to the scale plate.

NOTA BENE:

The hoses from the internal container do not have to be disconnected. If you wish todisconnect them, close the valves on the pipes and on the bottle.


The displays shows 0000.

Set the value 1111.

Press the ENTERkey.


Press the upwards cursor shifting key or the downwards cursor shifting key to

select either BOTTLE CALIBRATIONand press ENTERto confirm.

The displays shows ZERO WEIGHT.

With the scale pan being completely empty, insert the numerical value 00.00andpress the ENTERkey.

The displays shows SAMPLEWEIGHT.

Position the sample weight on the scale plate (the suggested weight rangesbetween 10 and 15 Kg).

Enter the sample weight value and press the ENTERkey.




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7.10 - Transducer calibration

The calibration is carried out on the electronic board through a simulator, since thetransducer has already been calibrated by the manufacturer.

Transducer (SL31314) 0 bar / 10 absolute bars (-1 bar / +9 relative bars)

For the calibration of the transducer, comply with the following:

Disconnect the transducer cable from the electronic board.

Connect the simulator SL31233to the electronic board.

Connect a tester to the simulator.

Switch On the unit.





Press the upwards cursor shifting key or the downwards cursor shifting key toselect either PRES. CALIBRATIONand press ENTERto confirm.

The displays shows ZERO CALIBRATION.

Turn the simulator potentiometer until the voltage displayed by the tester reaches0 V.

Digit 0,000 on the keypad and press ENTERto confirm.

The displays shows WEIGHT CALIBRATION.

Turn the simulator potentiometer until the voltage displayed by the tester reaches4,00 V.




Disconnect the simulator and reconnect the transducer.


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Calibration verification





Press the upwards cursor shifting key or the downwards cursor shifting key toselect either INPUTS TESTand press ENTERto confirm.

Disconnect the service hoses and open the HIGHand LOWvalves on the frontpanel so that pressure inside the transducerreaches the atmospheric value.

Verify that the read pressure value ranges within 0,900 and 1,100 bars(the typical value is close to 1,000 bars).

Transducer (SL31410) 0 bar / 16 absolute bars (-1 bar / +15 relative bars)

For the transducer calibration comply with the following:

Disconnect the transducer cable from the electronic board.

Connect the simulator SL31233to the electronic board.

Connect a tester to the simulator.

Switch On the unit.







Turn the simulator potentiometer until the voltage displayed by the tester reaches0 V.



Turn the simulator potentiometer until the voltage displayed by the tester reaches3,00 V.




Disconnect the simulator and reconnect the transducer.


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38 SERVICE MANUAL

Calibration verification





Press the upwards cursor shifting key or the downwards cursor shifting key toselect either INPUTS TESTand press ENTERto confirm.

Disconnect the service hoses and open the HIGHand LOWvalves on the frontpanel so that pressure inside the transducerreaches the atmospheric value.

Verify that the read pressure value ranges within 0,900 and 1,100 bars(the typical value is close to 1,000 bars).

In case the simulator is not available, an emergency calibration can be carried out. Sucha procedure may be applied to both transducers and ensures anyway a properfunctioning of the unit. To carry out the emergency calibration comply with the following:

Switch On the unit.

Open the HIGHand LOW valves placed on the front panel.

Start the vacuum function and hold the vacuum for 5 minutes inside the hoses(such an operation also pulls a vacuum in the transducer).

Once the 5 minutes have elapsed stop the vacuum function, by verifying also on

the manometers that there are no leakages.







After pulling a vacuum inside the unit, stroke 0,000on the keyboard and pressENTERto confirm.


Disconnect the service hoses so that the pressure value in the transducer reachesthe atmospheric value.




Carry out the verification as described above.


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SERVICE MANUAL 39

7.11 - Oil replenishing scale calibration

Required equipment:

2 Sample weights.



Set the value 1111.

Press the ENTERkey.


Press the upwards cursor shifting key or the downwards cursor shifting key toselect either IN OIL CALIBRATIONand press ENTERto confirm.


With the scale pan being completely empty (bowl disconnected), insert thenumerical value 00.00and press the ENTERkey.


Position the sample weight on the scale plate (the suggested weight rangesbetween 200 and 1000 g).

NOTA BENE:

It is possible to weigh one of the bottles containing the oil and use it as sample weight.





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40 SERVICE MANUAL

7.12 - Oil purge scale calibration

Required equipment:

2 Sample weights.



Set the value 1111.

Press the ENTERkey.


Press the upwards cursor shifting key or the downwards cursor shifting key toselect either OUT OIL CALIBRATIONand press ENTERto confirm.


With the scale pan being completely empty (bowl disconnected), insert thenumerical value 00.00and press the ENTERkey.


Position the sample weight on the scale plate (the suggested weight rangesbetween 200 and 1000 g).

NOTA BENE:

It is possible to weigh one of the bottles containing the oil and use it as sample weight.





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8.0 - TEST AND PARAMETERS SELECTION

You will find below some tests used to carry out checks and the modification of thesome setup parameters.

8.1 - LCD test

This test allows checking the LCD and LEDs operation.



Enter the code 1515.

A menu is displayed containing the operations that may be carried out.

Press the cursor shifting key upwards or downwards to scroll the menu.

Select the DISPLAYTESTfunction and press ENTERto enter.

The display pixels and the LEDs are illuminated in sequence to check their correctfunctioning.


8.2 - Outputs test

This test allows checking the functioning of relays and connected components.






Select the OUTPUTS TESTfunction and press ENTERto enter.

As soon as the outputs test function is entered the compressor starts.

Press ENTERto shift to the next component.


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The following elements illuminate in sequence:

Compressor.

Pump.

EV1 EV2 (EV2 not used).

EV3 EV4 (EV4 not used). EV5.

EV6.

EV7.

EV8.

EV9.

EV10.


ATTENTION:

During this operation, parts of the circuit that could be under pressureare open. Be sure the circuit has been the depressurized(see chapter 5.0) before continuing.

8.3 - Inputs test

This test allows checking the electronic board digital inputs.






Select the INPUTS TESTfunction and press ENTERto enter.

The display shows in sequence: Bottle weight.

IN OIL Weight (valid for AC650PRO/AC690PRO only).

OUT OIL Weight (valid for AC650PRO/AC690PRO only).

Transducer (valid for AC550PRO/AC590PRO and AC650PRO/AC690PRO only).

NOTA BENE:

Values measured by the scales relate to the net weights (total weight less preset tare).



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8.4 - Helium test

This function enables solenoid valves EV1, EV3, EV5, EV6 to the test of productionwith the HELIUM machine for leak detection.

8.5 - Printer test

This function always performs a test print-out.






Select the PRINTER TESTfunction and press ENTERto print.


8.6 - Counters

This function displays the total of operations performed by the unit.






Select the COUNTERSfunction and press ENTERto enter.

The display shows the history report of the recovered coolant (total amount beforeinstallation) and the history report of the pump operating hours (total amountsince first installation).



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8.7 - Service printing

This function allows printing a report with some data on the unit.






Select the SERVICE PRINTINGfunction and press ENTERto print.

In the print-out report the following data are displayed:

Total of recovered coolant.

Total of working hours of the vacuum pump.

Bottle scale calibration date.

IN OIL scale calibration date (date valid for AC650PRO/AC690PRO only).

OUT OIL scale calibration date (date valid for AC650PRO/AC690PRO only).


8.8 - Oil discharge

This function enables to open the EV7 solenoid valve and to bleed pressure from thedistiller; it is thus possible to carry out the maintenance on the EV7 solenoid valve itself.Comply with the following procedure:






Select the OIL DISCHARGEfunction and press ENTERto enter.

The displays shows EV7.

Press MULTIFUNCTIONto open EV7 valve.

let EV7 valve open until there is no more pressure inside the distiller.

Press STOPto close EV7 valve again and carry out the maintenance operations onthe solenoid valve itself.


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8.9 - Parameters modification

For specific needs, some operating parameters can be modified.

ATTENTION:

The set values guarantee the correct functioning of the unit.The modification of these parameters shall have to be carried out onlyby the personnel in charge with the servicing of the A/C system beingduly authorized by the manufacturer.






Select the parameter and press ENTERto modify it.

After modifying the parameter, press ENTERto confirm.


Parameters to be modified are:

P1

Discharge system pressure. It is the absolute pressure value which, if exceeded, startsthe recovery. The default value is 1500.

P2

End of recovery pressure. It is the absolute pressure value which, if exceeded, stopsthe recovery. The default value is 600.

P3Vacuum test pressure. It is the absolute pressure value after which the vacuum test

turns out to be negative. The default value is 300.T1

Pump oil change threshold. It is the number of hours after which the message tochange the oil pump is displayed. The default value is 10.

T2

Self-cleaning time. It is the self-cleaning time expressed in seconds. The default value is120.

T3

Recovery maximum time, after which the function is interrupted and the display showsthe message HIGH RECOVERY TIME. The default value is 30 minutes.


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T4

Weight variations control threshold. It is the interval expressed in seconds after whichthe weight stability is checked during the recovery phase. Once this time interval haselapsed the recovery function is stopped if the weight has not varied(AC450PRO/AC490PRO only). The default value is 60.

T5

Oil discharge time. It is the oil discharge time expressed in minutes. The default valueis 5.

T7

Preset vacuum time. The default value is 20 minutes and has been obtained as averagevalue of the times suggested by car manufacturers.

T8

Not used.

T9

Vacuum test time, time for the check of any pressure increase after the vacuum.The default value is 300 seconds.

T10

Recycling plus vacuum time. It is the recycling plus vacuum function time expressed inminutes. The default value is 10.

T13

Charge maximum time, after which the function is interrupted and the display showsthe message INCOMPLETE CHARGE. The default value is 20 minutes.

T14

Dye EV9 valve opening time. It is the opening time expressed in seconds of the EV9solenoid valve which enables the injection of a dye dosage (AC650PRO/AC690PRO only).The default value is 5.

T15

Oil charge maximum time, after which the function is interrupted and the display showsthe message OIL CHARGE TIME HIGH(AC650PRO/AC690PRO only).

The default value is 10 minutes.T16

Flushing function maximum time, after which the function stops automatically andcontinues. The default value is 15 minutes.

T20

Vacuum test duration for flushing. It is the vacuum test time expressed in secondsduring the flushing function. The default value is 120.

T21

EV7 valve opening time during oil discharge. It is the opening time expressed inseconds of the EV7 solenoid valve during the oil discharge function. The default value is180.


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W1

Filter replacement threshold. It is the value expressed in Kilograms after which themessage replace the dehydrating filter is displayed. The default value is 150.

W6

Small bottle maximum capacity. It is the value expressed in grams of the maximumquantity of product with which the small bottle can be filled (AC450PRO/AC490PROonly). The default value is 10000.

W8

Big bottle maximum capacity. It is the value expressed in grams of the maximumquantity of product with which the big bottle can be filled (AC550PRO/AC590PRO and

AC650PRO/AC690PRO only). The default value is 20000.

OUTOIL2

Maximum capacity of the OUT OIL bottle, if this capacity is exceeded the messageBOTTLE FULL, DRAIN BOTTLEis displayed (AC650PRO/AC690PRO only).The default value is 250 grams.

OUTOIL3

Not used.

PIPES CLEANING TIME

Minimum time for the cleaning of the service pipes. It is the minimum time in secondsbeing necessary to empty the service pipes after the charge (AC550PRO/AC590PRO and

AC650PRO/AC690PRO only). The default value is 60.

REPORT MANAGEMENT

It is necessary to enable the data memorization function through the PC ACUSBinterface (optional). The default value is 0 (disabled).

COMPENSATION SET TO 0

It is necessary to set the compensation function to 0 (that is to disable thecompensation) during the charging phase. The default value is 0 (disabled).

BY-PASS

It is necessary to enable the by-pass function. When it is enabled it is possible toby-pass the waiting times in the main functions of the machine through theMULTIFUNCTIONkey. The default value is 0 (disabled).

ECOLD 2006

The CPU cards of 2006 may be used for the systems of 2004/2005 only by setting thevalue to 0. If the value is set to 1 the card is set up for 2006 systems only.The default value is 1.

RENAULT CONFIG.

Mode required by Renault for its chain, it modifies the waiting times between recovery

cycles by extending them. It can be enabled or disabled by selecting the relevantoption.


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BACKUP

To save station data before updating the software. For the backup follow instructionsbelow:

Select the function and press ENTERto enter.

Introduce a key (other than the programming key) to store data.

Confirm the cancellation of data already present on the key, if any.

At the end of the backup extract the key.

Update the software and switch off the unit.

Introduce the backup key to transfer data, hold down the MULTIFUNCTIONkey,

switch on the unit and release the MULTIFUNCTIONkey.

At the end of the operation extract the key.

NOTA BENE:

The backup phase prevents a new calibration of the unit after an update of thesoftware.

8.10 - Software update

By the programming key it is possible to update the software and the unit messages.Before updating, carry out a backup of EEPROM to prevent loosing the unit calibrationand setup parameters.To carry out this operation follow instructions below:

Switch off the unit.

Introduce the programming key.

Introduce the backup key to transfer data, hold down the MULTIFUNCTIONkey,switch on the unit and release the MULTIFUNCTIONkey.

At the end of programming the unit resets automatically.

Extract the programming key.


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9.0 - DIAGRAMS

9.1 - Flow diagram

M2

HIGH

LOW

P1T1

T2

1

2

P

EV1

EV5

EV3

EV6

3 F1

C

P2

HP

5

VU2

6

F2

9

4

EV710

7

V1

8

V3 V2V4

V6V5

M1

M3

13

12

11

EV10

VU3 VU1

EV8EV9


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9.2 - Power card

VENTOLA

L

N

T

F1 F2 F3

CPU

INT

220 V

N

CO

MP

F

AN

POM

PA

EV1

EV9

EV1

P

EV3

EV5

EV6

EV7

EV8

C

10

CN1

P2

HP

EV2

EV3

EV8

EV7

EV6

EV5

EV4

EV9

EV10

EV10


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SERVICE MANUAL 51

9.3 - Display card

CPU

PROGRAM

RS-232

PRESSURE

OUTOIL

INOIL

PRN

TANK

RS232-B

Power cardconnection

Programmingconnector

Printerserial

connection

Oil purge scaleconnection

Transducerconnection

Oil injectionscale

connection

Printerpower supplyconnection

Tank scaleconnection

2 Serial


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9.4 - Flow diagram components description

2 Vacuum pump: two-stage rotary pump with capacity 183 l/m, conceived toremove humidity and air from A/C systems.

3 Expansion valve: measures the refrigerant flow into the tool oil separator.The allowable tolerance of the valve is 2 - 2,3 bar. To check tolerance connect apressure gauge at the oil service/discharge inlet port and replenish at least 4,5 Kgof refrigerant for 10 minutes.

4 A/C system oil separator:heat exchanger: cedes heat to the internal cylinderthus triggering the formation of saturated vapour and the evaporation of theaccumulated refrigerating liquid, stops the refrigerant inlet into compressor andenables refrigerant oil to deposit on the separator bottom.

5 Compressor oil separator: separates compressor oil taking it out of

compressor during the refrigerant flow. Oil is replenished in the compressor. 6 Compressor: sealed compressor with 14 cc. piston used to make refrigerant

flow. It turns low pressure and low temperature of inlet gas into high pressure andhigh temperature of outlet gas.

7 Bottle:allows the storage of recovered refrigerant.

8 Scale: sends a signal to the electronic card for the accurate readings of theweight and for the protection of the tank overfilling.

12 Oil replenishing scale: sends a signal to the electronic board of the

accurate readings of the weight and of the empty oil bottle. 13 Oil purge scale: sends a signal to the electronic card for the accurate

readings of the weight and for the protection of the oil bottle overfilling.

T1 Low side hose (" Acme 14 mm, without quick coupler):enables the

flow from the low side of an A/C system to the low side valve.

T2 High side hose(" Acme 14 mm, without quick coupler):enables the

flow from the high side of an A/C system to the high side valve.

M1 Low side pressure gauge:displays pressure and/or vacuum inside the tool

low side hose. M2 High side pressure gauge:displays pressure and/or vacuum inside the tool

High side hose.

M3 Inside tank pressure meter: visualize the pressure into the unit storagetank.

F1 Inlet line filter:filters refrigerant from the valve assembly before it enters themanifold set.

F2 Filter dryer:remove humidity and filters the refrigerant flow. The average life

of the filter is of 150 Kg of recovered refrigerant.


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VU1 Oil protection unidirectional valve:Valve that prevents the passage ofthe coolant inside the measurable container 1, in case the EV8 solenoid valveshould malfunction.

VU2 Single direction discharge valve:allows the flow in one single direction

and prevents the correction of tank refrigerant and pressure into the low pressureof the tool when oil goes back to the compressor and pressurises the oil separationcircuit.

VU3 UV dye protection unidirectional valve:Valve that prevents the passageof the coolant inside the measurable container 11, in case the EV9solenoid valveshould malfunction.

EV1 Vacuum solenoid valve:automatic solenoid valve usually closed preventingthe refrigerant flow in the vacuum pump when the latter is not supplied. When it is

supplied it allows the flow from the A/C system to the vacuum pump.

EV3 Passage solenoid valve: circuit sectioning solenoid valves.They separate into two sections the hydraulic circuit.

EV5 Recovery solenoid valve: automatic solenoid valve usually closedpreventing the refrigerant flow into the oil separator if the latter is not supplied.

EV6 Recharge solenoid valve: automatic solenoid valve usually closedpreventing the refrigerant flow from the tank to the tool when the latter is not

supplied.

EV7 Oil drain solenoid valve: allows the oil of refrigerant removed form theA/C system to be drained after recovery. It is also used as service door.

EV8 Oil replenishing solenoid valve:allows new oil to enter the A/C system forreplenishing it.

EV9 UV dye injection solenoid valve:allows the UV dye to enter in the A/Csystem.

EV10 High/low pressure separation solenoid valve:It enables to carry outthe charge only from the high side during the automatic function.

Pressure transducer P1:component managing the car function and supplyingcontinuously the ecu with data on the A/C system pressure.

Safety pressure gauge P2:usually closed between contacts 1and 2, opens at14,5 bar and closes again at 11,9 bar. If in the A/C system high side pressureexceeds 14,5 bar, the switch opens on contacts 1-2 and closes on 1-4, thusstopping all functions.


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10.0 - GLOSSARY OF TERMS

Refrigerant: A refrigerant solely of the type for which the unit has been created(ex. R134a).

A/C system: Air-conditioning system in the motor vehicle.

Unit: AC650PRO/AC690PRO equipment for the recovery, recycling, evacuation andfilling of the A/C system.

External tank: Non-refillable fresh refrigerant (ex. R134a) cylinder, used to fillthe refrigerant tank.

Refrigerant tank: The tank specifically designed for the unit.

Function: Execution of an individual function.

Recovery/Recycling: Function in which the refrigerant is recovered by anA/C system and stored in the internal container.

Evacuation: Function in which incondensables and moisture are evacuated froman A/C system solely by means of a vacuum pump.

Oil injection: Introduction of oil inside an A/C system for the purpose ofmaintaining the amount of oil specified by the manufacturer.

Filling: Function during which refrigerant is introduced into anA/C system in the amount specified by the manufacturer.

AC 690 Service Eng

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