GAT GM720A-YF User manual

GM720A-YF A/C Service Station
GM720A-YF
A/C System Maintenance Centre

GM720A-YF A/C Service Station
Safety
A. The machine is designed to be used and repaired by qualified personnel only.
B. The machine is designed to be used for R134a or R1234yf refrigerant. But if you select using for R134a, you can’t
use for R1234yf anymore and vice versa.
C. Fill the A/C system with the quantity of refrigerant recommended by the manufacturer.
D. Check the vehicle user manual for the type of refrigerant. Do not mix different type of refrigerant otherwise it’ll easily
lead to malfunction of the machine.
E. Keep away from moving parts and rotating elements such as cooling fans, alternators and heating components, etc
to avoid harm.
F. Wear protective clothing gloves and goggles.
G. As automotive air conditioning pipe flushing, the operator must be fully familiar with automotive air conditioning
system and operation of the machine. Check whenever the engine is turned off that the ignition key is turned to the
full OFF position!
H. Do not expose the machine to direct sunlight or rain. Use only in well-ventilated work areas.
I. Never exceed 30 ° tilt in transit process upside down is strictly prohibited.
J. Do not touch the machine high voltage power supply section, and do not maintain the machine as power on.
K. Care of the manual.
L. We reserve the right to modify the contents of this document without prior notice to our
Customers

GM720A-YF A/C Service Station
CONTENTS
1、Introduction.........................................................................................................................................................1
1) Outline.................................................................................................................................................................. 1
2) Features............................................................................................................................................................... 1
3) Specifications...................................................................................................................................................... 1
2、Functions............................................................................................................................................................ 2
1) Primary functions................................................................................................................................................ 2
2) Subsidiary functions........................................................................................................................................... 2
3. Operation..............................................................................................................................................................3
1) Parts descriptions............................................................................................................................................... 3
2) First use................................................................................................................................................................4
3) Preparations before Operation.........................................................................................................................4
4) Power On............................................................................................................................................................. 4
5) Flushing................................................................................................................................................................5
6) Recovery/Recycling............................................................................................................................................6
7) Vacuum.................................................................................................................................................................6
8) New oil adding.....................................................................................................................................................6
9) Recharging...........................................................................................................................................................7
10) Auto. Mode.........................................................................................................................................................7
11) Database............................................................................................................................................................8
12) Equipment Maintanance................................................................................................................................. 8
12-1) Exchange dry filter........................................................................................................................................8
12-2) Clean pipe of the unit................................................................................................................................... 8
12-3) Calibration of load cell..................................................................................................................................8
12-4) Change vacuum pump oil............................................................................................................................8
13) Discharge non-condensable gases...............................................................................................................9
14) System function................................................................................................................................................ 9
14-1) Supply main tank (internal tank).................................................................................................................9
14-2) Parameter setting....................................................................................................................................... 10
14-3) Exchange auxiliary tank (just for AMC-800A-YF)................................................. 错误！未定义书签。
14-4) Change refrigerant type.............................................................................................................................10
15) Equipment info................................................................................................................................................ 11
15-1) System inquiry.............................................................................................................................................11
15-2) Servicer info................................................................................................................................................. 11
15-3) Equipment info............................................................................................................................................ 11
16) Help.................................................................................................................................................................. 12

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1、Introduction
1) Outline
A/C system maintenance equipment is with the latest design technology, which uses the best control principle
and the manufacturing process.
A/C System Maintenance Centre is intelligent equipment collecting of the A/C flushing, recovery, recycling,
recharging and other functions in one. It’s with the beautiful shape, humanized operation interface, and
advanced manufacturing processes to make the A/C maintenance professional and simple.
2) Features
A、Fully automatic,easy to operate.
B、Internal pipeline of A/C system flushing, effectively cleared the internal greasy and fouling, to restore the
A/C system performance.
C、With forward flushing, reverse flushing, and pulse flushing functions, which greatly improve the cleaning
effect.
D、Using large-size glass tube with LED backlighting, can effectively observe the entire cleaning process.
E、Vertically installing the HP & LP gauges let the operator be able to observe the pressure parameters
timely even in the car.
F、Unique design of the pipeline to achieve the high recycling rate no matter with the gas or the liquid.
G、Easy to operate with the concise operating interface.
H、Designed with large size LCD.
I、Database.
J、Program and database can be updated.
K、With printer.
L、Designed with auxiliary load cell for recharging by the external refrigerant tank. (external tank, only 800A)
3) Specifications
A、Working conditions:
Ambient temperature: 0~50°C
Relative humidity: ＜85%
B、Voltage input: □AC220V±10％~50/60Hz □AC110V±10％~60Hz （See as nameplate）
C、Compressor：12.12cm3
D、Vacuum pump: 100L/min，2Pa
E、Load cell for tank: ±10g
F、Load cell for oil bottle: ±5g
G、Tank: 12L
H、New oil bottle: 280ml
I、Used oil bottle:500ml
J、LCD display: 240*128

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K、Working pressure: max. 20bar
L、HP gauge: -1bar~35bar
M、LP gauge: -1bar~20bar
N、Backlighting：LED
2、Functions
1) Primary functions
A、Automatic flushing
B、Automatic recovering/recycling
C、Automatic/manual used oil drain
D、Vacuum timing.
E、Automatic/manual new oil injection
F、Quantitative recharging
G、Auto mode
H、Database
I、Print
2) Subsidiary functions
A、System function
B、Discharge non-condensable gases
C、Machine maintenance procedures
D、Equipment info inquiry
E、Help

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3. Operation
1) Parts descriptions
HP gauge
Operation panel
LP gauge
Dry-filter
service port
TP gauge
Switch for new
oil adding
New oil bottle
Switch for used
oil discharge
Used oil bottle
Printer
LCD display
HP Port
LP Port
Auxiliary Port
Power switch
Socket
Window

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2) First use
A、Set the language: select one and press ENTER.
B、Set the refrigerant type: select one you will use.
Warning: After you confirm one type, you’ll not use for another type.
C、Please supply about 4 kg refrigerants into the tank of equipment so that all of the functions can run
normally. Please refer to the chapter of “Refrigerant supply”.
D、Please read this user manual carefully before operating.
3) Preparations before Operation
A、To check if there has enough refrigerant in the tank. The volume should be 4~6 kg.
B、Empty the used oil bottle.
C、Check the automotive A/C system. If there has any leakage, it must be repaired firstly to avoid refrigerant
leak during flushing process.
D、Check if the automotive air-conditioning can run normally.
Warning: When the machine is running, never to run the A/C system!
4) Power On

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Description:
Flushing
This function include flushing and
recovery process.
Database
Check the amount of Refrigerant & oil
Recovery
Recovery the refrigerant of A/C
system.
Equipment Maintanance
Exchange dry-filter, Pipe-line
cleanning, Calibration load cell.
Vacuum
Timing vacuum.
Discharge non-condensable gases
Avoid high-pressure alarm.
New oil adding
Fill the new oil into A/C system.
System function
Supply,Parameter setting,Exchange
filling tank,Change refrigerant type
Recharging
Recharge quantitative.
Equipment info
System info,Servicer info, Equipment
info.
Auto. Mode
Automatically all the process.
Help
Descriptions of the alarming code.
5) Flushing
A、By this function, it will be able to clean out the refrigerant oil and oil sludge to exchange the refrigerant entirely to improve
the performance of compressor. And also it will recover the refrigerant remained in the A/C system.
B、Before flushing the pipeline of automotive A/C system, please turn on A/C system and run it for 5 to 10
minutes. And set it as the lowest temperature and medium wind.
C、Turn off the automotive air conditioning.
Warning: do not start the air conditioning during the flushing process! Otherwise, it easily causes
damages to the air-conditioning and risk of accident!
D、In order to achieve good flushing performance, the flushing time should be more than 30 minutes.
Note: The flushing time does not include the time of recovery process. Once the flushing is
finished, the machine will run the recovery function automatically.
E、Operations:
E-1: Select the Flushing Function and press the ENTER key.
E-2: Set the flushing time.
E-3: Press the ENTER key to start.
F、When finished, it’ll stop automatically.
Notice: it’s normal for that there have action sound of the solenoid valve during the working

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process. Please do not stop it. The used oil can be drained out automatically.
Warning: Strictly prohibit to press the Button switch of new & used oil bottles.
6) Recovery/Recycling
A、By this function, it will recover the refrigerant remained in the A/C system.
B、Operations:
B-1: Select the Recovery Function and press the ENTER key.
B-2: Press the ENTER key to start.
B-3: After recovery over, it’ll drain the used oil automatically.
C、When finished, it’ll stop automatically.
Notice: After end, you can drain the used oil by manual.
7) Vacuum
A、By this function, it will clean the water vapor out from the A/C system.
B、It should be more than 15 minutes. Generally, it needs 15 minutes at least for the air conditioning only
with front wind and 20 minutes for with the front and rear wind.
C、Operations:
C-1: Select the Vacuum Function and press the ENTER key.
C-2: Set the vacuum time.
C-3: Press the ENTER key to start.
D、When finished, it’ll stop automatically.
8) New oil adding
A、It must be able to do after vacuum process.
Warning: please do not press the switch of the new oil bottle anytime when the automotive air
conditioning system is not in vacuum state, otherwise it have the risk of explosive bottles!
B、Pour new oil into the new oil bottle.
Note: add new oil more 20ml than the used oil drained out to avoid the air into the air conditioning
system.
C、Method 1: Control by manual.
After vacuum, press the button switch of the new oil bottle to fill the new oil.
D、Method2：Control automatically.
D-1: Select the New oi adding Function and press the ENTER key.

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D-2: Set the adding amount.
D-3: Press the ENTER key to start.
9) Recharging
A、Select the Recharging Function and press the ENTER key.
B、Set the recharge amount.
C、Press the ENTER key to start.
D、When finished, it’ll stop automatically.
Note: The recharging amount setting as following.
Method 1: Set the amount directly.
Method 2: Set the amount by the database. Steps as following:
Note: In the recharging process, if shows the menu, it means
that you need to turn on the car air-conditioning to complete
the recharging process. Later, you should supply new
refrigerant into the tank.
10) Auto. Mode
A、Under this mode, all of the functions can be run full automatically after setting the parameters.
B、Before running, must drain out the used oil entirely and fill enough new oil into the new bottle.
C、Operations:
C-1: Select the Auto. Mode Function and press the ENTER key.
C-2: Set the all parameters.
C-2: Press the ENTER key to start.
D、When finished, it’ll stop automatically.
Press
key
ENTER

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11) Database
Here you can read the refrigerant type and filling amount and the refrigerant oil type and filling
amount of the automotive.
12) Equipment Maintanance
12-1) Exchange dry filter
A、The dry filter must be exchange when it reaches the life time. There will give a message.
B、If not exchange the dry-filter timely, it will not be able to run the recovery, flushing and supplying functions.
C、Operations:
C-1: Please check the ID of the dry-filter at the label. Which is the SN.
C-2: Select Exchange dry-filter Function and press ENTER key.
C-3: Input the ID.
C-4: And then do step by step as the information.
Note: Please attention the mounting direction of the dry-filter.
12-2) Clean pipe of the unit
A、After a period of use, such as 2months, it should be run this function.
B、It can clean up the pipe line of the machine.
12-3) Calibration of load cell
A、When the load cell is not precise, it needs to be calibrated.
B、You need input the password 1510 before use this function.
C、If do the calibration of main tank load cell, please prepare a 10~15kg weight.
If do the calibration of oil bottle load cell, please prepare a 1kg weight.
If do the calibration of auxiliary tank load cell, please prepare a 10~15kg weight.
D、Follow the prompts step by step.
Note: if here have some programs, please check according to the messages.
12-4) Change vacuum pump oil
A、When the pump oil became cream or machine display maintenance message, the vacuum pump oil must
be changed.
B、If not change the pump oil in time, the vacuum pump will be easily damaged.
C、Steps:
C-1: Open the back-down cover.

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C-2: Unscrew the block of the drain port to drain the old oil out entirely. Then re-back the block to the
drain port.
C-3: Unscrew the cap of the fill port and then fill the new oil slowly into the vacuum pump until the oil level
reach at the center site. Then re-back the cap to the fill port.
Note: the new vacuum pump oil cannot be filled too much into the vacuum pump otherwise it will
spray out when working.
C-4: Re-back the cover.
13) Discharge non-condensable gases
A、When the machine appear the High-pressure Alarm, it need do this function.
B、We advise that it should be done once a month.
14) System function
14-1) Supply main tank (internal tank)
A、If the refrigerant amount in the main tank is less 4kg, the flushing function can’t run any more until supply
enough refrigerant into the machine.
B、There have two ways to supply the refrigerant.
Method 1:
M1-1: Connect the port of fresh refrigerant tank to the LP port of equipment.
Note: it should connect to the liquid port of fresh refrigerant tank. If has no liquid port, please
place the fresh refrigerant tank upside down.
M1-2: Block the HP port of equipment with a cap.
M1-3: Select supply main tank function and then set the supplying amount.
Window
Drain port
Fill port

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Note: Amount of supplying：Setting the amount according to remain amount in the tank.
Suggestion: supplying amount = (4.5~5) - remained amount.
M1-4: When alarming, please close the valve of the refrigerant tank and until finished automatically.
Method 2:
Use the supplying connecter
M2-1: Fitting the supplying connecter to the port of fresh refrigerant tank.
Note: it should connect to the liquid port of fresh refrigerant tank. If has no liquid port, please
place the fresh refrigerant tank upside down.
M2-2: Connect the HP (or LP) coupler to the supplying connecter.
M2-3: Select the Recovery function and run it.
M2-4: When you see the total amount more than 4.5kg, close the valve of the refrigerant tank and until
finished automatically.
Note:
Main Tank: the tank is installed in the machine which is used for the flushing, recovery, recharging
functions.
Auxiliary Tank (fresh refrigerant tank): the refrigerant tank is installed by user which is just used for
the recharging.
14-2) Parameter setting
14-2-1: Change the language.
14-2-2: Change the units.
14-3) Change refrigerant type
If you want to use another type refrigerant, you must do this function. Please operate following the
prompts step by step.

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15) Equipment info
15-1) System inquiry
Here you can check the working status of the machine.
15-2) Servicer info
Here you can set and check the servicer and dealer information.
The way for setting:
Press and keys at same time into the setup state.
Use the and keys to select position
Use the and keys to set the content.
15-3) Equipment info
Here you can check the SN, hardware version, software version etc.

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16) Help
Here you can check all of the help messages.

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Declare：
We reserve the right to modify the contents of this document without prior notice to our customers.