R744
Technical Manual
Please read this manual carefully before installing and using.
Follow the warnings and precautions marked in the product
manual.
CONTENT
1.Instruction .............................................................................................................1
1.) Safety Precautions ..........................................................................................1
2.) Safety Signs on the Machine ...........................................................................2
2. Product introduction ............................................................................................2
1.)Features ...........................................................................................................2
4. Nitrogen leak check； ..........................................................................................3
2. )Technical Specifications .................................................................................3
3. Product Description and Appearance ..................................................................4
3.1 Front View.....................................................................................................4
3.2 Rear View ......................................................................................................5
3.3 Right Side View.............................................................................................5
4. Initial Setup ..........................................................................................................7
Change work tank ................................................................................................7
7)Work tank change completed............................................................................7
5. Basic Operations ...................................................................................................7
5.1 Select the oil type ..........................................................................................7
5.2 Automatic Mode ............................................................................................8
5.3 Manual operation ...........................................................................................9
6. Maintenance .......................................................................................................12
6.1 Change vacuum pump oil............................................................................. 12
6.2 Load cell calibration .................................................................................... 13
6.3 Leak check................................................................................................... 14
7. Setting ................................................................................................................. 14
8. Troubleshooting .................................................................................................. 16
Do not use an extension cord. Do not use the machine
1.Instruction
in the vicinity of flames and hot surfaces. Refrigerant
can decompose at high temperatures and free toxic
1.) Safety Precautions
substances to the environment that can be noxious to
i.)ALLOW ONLY QUALIFIED PERSONNEL TO
the user. Do not use the machine in environments
OPERATE THE MACHINE. Before operation,
containing explosive gases or vapors. Do not use this
read and follow the instructions and warnings in this
machine in ATEX classified zones or areas. Protect the
manual. The operator must have knowledge about air
machine from conditions that can cause electrical
conditioning and refrigeration systems, refrigerants,
failure or other hazards relating to ambient interaction.
and the dangers of pressurized components. If the
v.)DO NOT PRESSURE TEST OR LEAK TEST
operator
EQUIPMENT
cannot
read
this
manual,
operating
AND/OR
VEHICLE
AIR
instructions and safety precautions must be read and
CONDITIONING
discussed in the operator’s native language.
COMPRESSED AIR. Mixtures of air and R1234yf
ii.)USE THE MACHINE AS OUTLINED IN THIS
refrigerant can be combustible at elevated pressures.
MANUAL. Using the machine in a manner for which
These mixtures are potentially dangerous and can
it was not designed will compromise the machine and
result in fire or explosion causing personal injury
nullify the protections provided.
and/or property damage.
iii.)AVOID BREATHING IN A/C REFRIGERANT
vi.)NEVER START THE MACHINE IF IT WILL
OR LUBRICANT VAPOR OR MIST. Exposure can
NOT BE USED IMMEDIATELY. Disconnect the
irritate eyes, nose, and throat. To remove refrigerant
electrical supply before a long period of inactivity or
from the A/C system, use only equipment certified for
before internal maintenance is performed.
the type of refrigerant being removed. Use the unit in
DO NOT MODIFY THE PRESSURE RELIEF
locations with mechanical ventilation that provides at
VALVE OR CHANGE THE CONTROL SYSTEM
least four times ventilation per hour. If accidental
SETTINGS. Using the machine in a manner for which
system discharge occurs, ventilate the work area before
it was not designed will compromise the machine and
resuming service.
nullify the protections provided.
iv.)TO REDUCE THE RISK OF FIRE, do not use
vii.)HOSES
the machine in the vicinity of spilled or open
REFRIGERANT UNDER PRESSURE. Contact
containers of gasoline or other flammable substances.
with refrigerant can cause personal injury, including
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CAN
SYSTEMS
CONTAIN
WITH
LIQUID
blindness and frozen skin. Wear protective equipment,
REFRIGERANT. Do not overfill the internal storage
including goggles and gloves. Disconnect hoses using
vessel (ISV). Overfilling can cause explosion resulting
extreme caution. Ensure the phase is complete before
in personal injury or death. Do not recover refrigerants
disconnecting the machine to prevent the release of
into nonrefillable containers; use only type-approved
refrigeration to the atmosphere.
refillable containers that have pressure relief valves.
viii.)PRESSURIZED TANK CONTAINS LIQUID
2.) Safety Signs on the Machine
Carefully read the instructions.
Do not use in open air in case of rain or high humidity.
Wear gloves.
Wear protection goggles.
Grounding protection.
Electrical shock hazard.
2.Product introduction
1.)Features
1. Compatible for Petrol& Electric vehicle using CO2;
2. Applicable to different specification CO2 cylinders: 2kg、5kg、10kg；
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3. Fully automatic to release, vacuum and recharge of CO2;
4. Nitrogen leak check；
5. Equipped with a heating belt to charge in extremely cold weather；
6. 10-inch touch screen: fully digital display and control;
7. 3 high-precisive pressure sensors, the accuracy can reach 1psi；
8. "4" high-precisive electronic scales: the CO2 tank, PAG oil,POE oil and drained oil bottles and
easy to calibrate(automatic and zero calibration)；
9. Patent design oil bottle: avoid the contamination of the new oil in contact with the air and
humidity；
10. Printer: print out the operation results, workshop information and service time as required；
11. Intelligent prompts for operation report, filter and vacuum pump oil replacement；
2. )Technical Specifications
Refrigerant:
Voltage:
Power:
Working temperature:
R744（CO2）;
220V/50HZ;
600W(standard)/1400W(heating);
5-45℃；
CO2 cylinder size:
2kg、5kg、10kg;
Display:
Pressure gauges：
Pressure sensor:
Vacuum pump capacity：
Electric scale:
Scale accuracy:
Heat belting：
Oil bottle:
Printer:
Max work pressure:
N2 leak check range:
Machine dimension(L*W*H):
Packing dimension(L*W*H):
Net weight(kg) :
Gross weight(kg) :
10.1 inch touch;
Digital；
3 (±1psi);
180L/min;
4;
±5g;
800W temperature-controlled bag heating belt;
3*350ml (PAG,POE,Drain)；
Thermal printer;
170bar；
90-120bar;
660*500*1100mm;
700*540*1230mm;
75kg；
105kg；
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3.Product Description and Appearance
3.1 Front View
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3.2 Rear View
3.3 Right Side View
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3. How to connect the equipment
1.) Connect the red and blue quick connectors to the red and blue service hoses.
2.) Connect the high-side (red) and low-side (blue) service hoses to the vehicle A/C system.
High and low side valve operation guidelines
During the operation, the system will prompt "close high and low side valves" and "open high and low side
valves" for many times,which means:
“Close high and low side valves” ：
As shown in the picture, tighten the high and low side valves counterclockwise, which is the opposite direction
of the arrows on the high and low side valves (arrows marked "open").
Close the A/C system quick connector
Tighten the A/C system quick-connector counterclockwise
“Open the high and low side valves” ：
As shown in the picture, tighten the high and low side valves clockwise, which is the direction of the
arrows on the high and low side valves (arrows marked "open")
Open the A/C system quick connector
Tighten the A/C system quick-connector clockwise
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4. Initial Setup
For the first time use, please follow the prompts to
complete the initial setup.
Change work tank
1) Follow the instruction to operate.
6)Work tank change completed. Start to vacuum the
hose, please wait.
2)Evacuating the remaining CO2 (For the first time
use,the evacuate program will automatically skip.)
7)Work tank change completed.
3)Please input the net weight of the CO2 work tank.
5.Basic Operations
5.1 Select the oil type
1)The unit is compatible with PAG and POE oil,
please select the type of oil you need before use.
4)Please follow the instruction to operate.
2)If the oil type selected this time is the same as
that selected in the previous operation, you can go
to the next step directly.
5)Change the new work tank and follow the
operation.
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3)If the selection is different from the last used oil,
system will automatically prompt.
5.2 Automatic Mode
Follow the instruction to next step. Press
to next step.
1)Choose Automatic from the main menu.
2)Please follow instruction to open the CO2 tank
valve.
4)Hose Flushing, please wait.
5)Hose cleaning completed. Press
to next step.
Replace the PAG/POE HP hose and start to operate
the unit.
3)Set the function as require,and press
continue.
Ensure the value being correct and then press
to continue. If there is an error, press"Reset" to
return to reset the parameters.
6)If you need to re-select the type oil, click
to back to the interface for selecting the oil.
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2)Doing vacuum, please wait.
4)Follow the prompted instructions to operate.
5)Full automatic operation completed. Press
print. Or press
to
to exit to Main Menu.
3)Draining the compressor oil, please wait.
5.3 Manual operation
4)Evacuate completed, you can choose to print out
the result.
Choose menu of “MANUAL”.
Choose the process you want to operate.
5.3.2. Vacuum
1)Set the parameter as required. Then press
to continue.
5.3.1. Evacuate
1)Connect the service hose to the vehicle and open
the valve.
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2)Follow the instruction, and press
step.
to next
2)Charging the oil. Please wait.
3)Vacuum in process, wait.
3)Charge refrigerant is in progress, when it arrives
the pre-charge leak check amount, it will start
checking leak....
4)Leak testing if you have chosen that function.
4)Follow the instruction to operate, then press
to continue.
5)Vacuum completed. Double check all the
parameters. Press
to Main menu.
to print, or press
back
5)Follow the instruction to operate, then press
to next step.
5.3.3. Charge
1)Set the parameters as required. Then press
next step.
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6)Balance the pressure, please wait.
5.3.4. Nitrogen leak check
1)Set the parameters as required. Then press
next step.
7)Follow the instruction to operate and then press
to next step.
2) Following the instruction to connect the hoses.
8)Draining the refrigerant and wasted oil, please
wait.
4)Leak check is in progress, please wait.
9)Charge
completed.
parameter. Press
exit.
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Double
check
to Print it or press
all
the
to
5)Nitrogen leak check completed.
11
to
6)Evacuating the nitrogen...
Please follow the recommended schedule for
Maintenance.
Maintenance
Recommended Interval
System automatically prompt.
600mins, when it only left
10%, which means only
60mins left, the system will
have a pop-up interface to
remind.
Every six months.
The Automatic calibration is
the most recommended mode,
the zero calibration is only for
the empty bottles.
Every three months.
Check hoses and connections
for leakage and run the
program to do the leak check.
7)Nitrogen leak check completed.
6.Maintenance
Choose “Maintenance” in main menu.
6.1 Change vacuum pump oil
1)Check the rest lifetime of filter. For replacement,
press “Yes”.
Choose the desired function.
2)Warm up the pump oil.
3)Warm up completed. Follow the instruction, press
to next step.
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2-1)Automatic calibration .(recommended)
4)Oil replacement completed..
Calibration completed.Please double check all the
parameters.
6.2 Load cell calibration
2-2)Zero calibration.
1)Please input the password. (Contact the dealer for
the password)
Ensure the bottle is empty and press “Zero
Calibration”.
2)Choose the desired calibration method and scale.
Reset it to zero,please press “Yes” to continue.
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Please wait.
6.3 Leak check
1)Follow the instructions to operate. Press
To next step.
Calibration completed. Check the data to see if it is
calibrated successfully.
2)Leak testing, please wait.
2-3)Weight Calibration
Select the scale that needs to be calibrated.
3)If any leak, please check manually.
Follow the instruction. Press
to next step.
4)If no leak, test completed.
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Choose the desired functions.
7. Setting
Choose “Maintenance” from Main menu.
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8. Troubleshooting
Display
1.Touch screen
FAILED
2.The electronic
scale is not
accurate
Cause
Solution
1.Click the touch screen, no key sound.
Replace the touchscreen
2.Smashed by an object .
Replace the touchscreen
3.The screen does not display as a black screen, it may be a problem
with the power supply of the motherboard.
Repair the Main board and
Check the Screen
4.There is a key tone interface but no action.
Repair the Main board
1.Incorrect operation to zero the recovered refrigerant.
Enter“maintenance”-”load
cell calibration”-”automatic
calibration”
2.The chassis screws are loose, fix the stability sensor screws, and the
liquid storage tank fixing screws are loose.
Re-tighten tightening
screws
3.Transportation or loose fixing screws make the wall of the liquid
storage tank contact other parts of the equipment.
Tighten the fixing screws of
the weight after adjustment,
4.If you disassemble and repair without permission, you should pay
attention to the arrow direction of the electronic scale is downward.
If it is installed in reverse, it
needs to be adjusted and
corrected
5.Damaged load cell.
Change
6.Damaged main board.
Repair
1.The refrigerant in the internal tank is less than 500g.
Recovery more than of
500g refrigerant to the tank
2. Insufficient refrigerant inside.
Change new work tank
3. Filling valve is blocked or valve core is damaged.
3.Charge
FAILED
Clean or replace
4.Damaged main board.
Repair
5.Manually close the hand valve of the internal tank.
Reopen
6.Incorrectly setting the filling amount to "zero".
Reset
1.Vacuum pump failure.
Change
2.Relay failure.
Change
3.Damaged main board
Repair
4.Prompt that the pressure of the hose is too high and cannot be
vacuum.
Recovery or manually
deflate the external hose to
less than 0.5KG/CM2
5.Can not maintain pressure for leak detection.
1.Check A/C system for
leaks
2.Whether the quick
connector and hose of the
refrigerant machine leak, or
the leak of the vacuum
pumping piping.
4.VACUUM
FAILED
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3.Check PAG POE and UV
solenoid valve for leakage
5.Smoky vacuum
pump
6.Noisy vacuum
pump
6.Filling valve leaks.
Change
1.The vacuum pump oil is deteriorated.
Change
2.Excessive vacuum pump oil, which accumulate vacuum pump oil
in the vacuum pump for a long time when vacuuming the A/C
system .
Drain oil from vacuum
pump to middle scale line
3 The connector of the pipes may be loose and ,which may cause
smoke.
Check and tighten the
relevant connector.
4.The vacuum time is too long, and the heat will cause the vacuum
pump oil to evaporate.
Ignore
5.Car A/C systems keep too much gas for a long time
The vacuum pump fixing screw is loose.
Ignore
The vacuum pump fixing screw is loose.
Re-fasten the screws
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