AU Tool LM708 User manual

www.autooltech.com
RefrigerantRecoveryMachine
AUTOOL LM708
User Manual
用户手册

COPYRIGHT INFORMATION
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You may contact AUTOOL by visiting AUTOOL at https://www.au-
tooltech.com, or writing to [e-mail], to request
written permission to use materials on this manual for purposes or
for all other questions relating to this manual.
●
●
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All rights reserved by AUTOOL TECH. CO., LTD. No part of this
publication may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means, electronic, mechanical,
photocopying, recording or otherwise, without the prior written
permission of AUTOOL. The information contained herein is
designed only for the use of this unit. AUTOOL is not responsi-
ble for any use of this information as applied to other units.
Neither AUTOOL nor its affiliates shall be liable to the purchaser
of this unit or third parties for damages, losses, costs, or
expenses incurred by the purchaser or third parties as a result
of: accident, misuse, or abuse of this unit, or unauthorized modi-
fications, repairs, or alterations to this unit, or failure to strictly
comply with AUTOOL operating and maintenance instructions.
AUTOOL shall not be liable for any damages or problems
arising from the use of any options or any consumable products
other than those designated as original AUTOOL products or
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Other product names used herein are for identification purpos-
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AUTOOL disclaims any and all rights in those marks.

TABLE OF CONTENTS
Cautions.............................................................................................................. 2
General safety................................................................................................. 2
Product Introduction.......................................................................................... 3
Overview......................................................................................................... 3
Specifications.................................................................................................. 3
Function table.................................................................................................. 4
Product Structure............................................................................................... 5
Structure diagram............................................................................................ 5
Operations Instruction....................................................................................... 7
Unlock load cells............................................................................................. 7
Fill equipment with refrigerant......................................................................... 7
Non-condensable purge.................................................................................. 8
Select refrigerant............................................................................................. 8
Equipment connection..................................................................................... 8
Recovery......................................................................................................... 10
Vacuum ........................................................................................................... 10
Charge ............................................................................................................ 10
Tank fill............................................................................................................ 11
Auto. mode...................................................................................................... 11
System setting................................................................................................. 12
Main Troubleshooting........................................................................................ 14
Maintenance Service.......................................................................................... 17
Maintenance.................................................................................................... 17
Warranty.............................................................................................................. 18
Warranty access.............................................................................................. 18
Disclaimer....................................................................................................... 18
Return & Exchange Service .............................................................................. 19
Return & Exchange......................................................................................... 19
1

CAUTIONS
General
safety
The storage cylinder in this unit contains liquid refrigerant.
Overfilling of the cylinder can cause violent explosion. Do not
disable the overfill safety feature. Always keep the cylinder on
the load cell platform whenever operating the machine.
The operator must carefully read the instruction manual before
any operation is performed. Incorrect operations could cause
serious consequences, such as, improper A/C service,
damage to automotive A/C system or damage to equipment.
Only use cylinders which are recommended by the manufac-
turer and supplied with this equipment.
Avoid inhalation of refrigerant or oil vapor/mist, read material
safety instructions on refrigerant and oil package.
Switch off and disconnect power cable from main supply
before removing any cover or servicing the equipment, to avoid
electric shock which can be very dangerous or fatal.
Never use compressed air for leak testing the unit or vehicle
A/C system!
Wear safety goggles and gloves, to protect eyes and skin from
contact with refrigerant. Coming in contact with liquid refriger-
ant can cause frostbite and blindness. If accidental contact is
made with liquid refrigerant, wash effected area with plenty of
fresh water and contact a doctor.
Avoid using extension power cable with copper core diameter
less than 1.5mm².
Keep gasoline or other flammable substances away from the
equipment.
Always operate unit in a well-ventilated area and away from
artificial heat.
For the correct use of the instrument, please read the full text
of this manual carefully before use.
2

3
LM-708 is an ideal option for workshops that have require-
ments of handling both R-134a and HFO-1234yf refrigerants.
The loss of refrigerant is minimized to less than 50 gram at
shifting from one refrigerant to another, and deep internal
evacuation ensures zero cross contamination between two
refrigerants. The machine is equipped with 2 refrigerant tanks,
which saves the operators’ time of replacing tanks. The unique
design has facilitated quick load cell unlock, easy and econom-
ic maintenance (even though DIY maintenance is facilitated by
our machine design, it is still highly recommended to leave
maintenance job to specialized technicians.), self troubleshoot-
ing and convenient USB upgrade etc..
PRODUCT INTRODUCTION
Overview ●
Specifications Input power
Compressor power
Vacuum pump capacity
Average gas state refrigerant
recovery speed (through charge /
suction port)
AC 220V ±10％ 50/60Hz,
or AC 110V ±10％60Hz
Accuracy of gas cylinder load cell ±10g
3/8HP
120L/min, non-sparkle
Recovery rate 96%
New oil bottle capacity 250ml
Used oil bottle capacity 400ml
Max. Pressure 20bar
Charge speed 2Kg/Min(max.)
High pressure gauge range - 1bar~40bar
Low pressure gauge range - 1bar~22bar
LCD display 7-inch, touch screen
10KG for each
0.25Kg/min
Capacity of dual gas
cylinders (one for R-134a,
one for HFO-1234yf)

4
Function
table Recovery
Vacuum
Tank fill
Charge
Language
Auto. mode
Calibration
Database
Unit set
Empty
container
weight set
Component
test
Main
function
Sys.
setting
Recovers and purifies refrigerant from
automotive A/C to equipment tank.
Evacuates air and moisturefrom the A/C
system. Upon completion of vacuum,
manual oil injection is prompted.
Select operation language.
Enter automotive A/C database.
Select metric or imperial units.
Set empty refrigerant gas cylinder.
Calibration refrigerant gas cylinder
load cells.
Test work status of solenoids, vacuum
pump and compressor.
Charge refrigerant from equipment
gas cylinder to automotive A/C system.
Performstheselectedfunctions inafully
automatic sequence. The machine will
stop automatically once all the selected
functions have been completed.
Transfer liquid refrigerant from an
external refrigerant storage cylinder to
equipment cylinder.
Can be used for fuel, hybrid or electric vehicles.
Dual condensers and cooling fans, one for R-134a,
one for HFO-1234yf.
Automatic service reminding. The equipment
filter-drier life is designed to desiccate and
recycle 100 KG refrigerant.
Pre-ventilation After power witch is turned on, the
machine makes 30 seconds ventilation,
before it is powered on.

5
PRODUCT STRUCTURE
Structure
diagram
Touch screen HP gauge
A B
LP gauge R-134a tank gauge
C D
Non-condensable purge
valve for R-134a tank
E
D
E
B
A
C

6
Power switch FuseF G
USB interface Power cable
H I
HFO-1234yf Coupler
connect fittings New oil bottle
J K
R-134a refrigerant tank HFO-1234yf tank gauge
L M
Used oil bottle HFO-1234yf
Refrigerant tank
P Q
R-134a Coupler
connect fittings
O
Non-condensable
purge valve for
HFO-1234yf tank
N
N
M
O
Q
P
F
G
H
I
J
K
L

7
OPERATIONS INSTRUCTION
Remove the two lock bolts, to release load cells of the two
tanks, and to make them ready to work.
●
Unlock
load cells
●
Fill equip-
ment with
refrigerant
Failure to remove the load cell lock bolts may cause wrong
refrigerant processing amount.
When you need transport the machine, please screw those
bolts on.
Warning
New equipment is empty, you need to fill the equipment with
refrigerant and refrigeration oil.

It is recommended to purge the air in equipment tanks every day
before turning on the machine. At left and right sides of machine,
non-condensable purge manual valves and pressure-tempera-
ture chart can be found. Turn the valve to purge the non-con-
densable, strictly abiding by the pressure-temperature chart
sticker.
●
Non-con-
densable
purge
Through tank fit tings, connect either HP or LP hose with exter-
nal refrigerant R-134a or HFO-1234yf, and turn on the machine,
select “Tank fill” function, set tank fill amount to fill R-134a or
HFO-1234yf tank with refrigerant.
It is recommended to maintain refrigerant level of both tanks at
4-6kg.
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8
Equipment
Connection Except the situations clearly stated in the manual, during all
equipment operations, please maintain the vehicle engine and
A/C off, otherwise unexpected damages may be caused.
Warning
Be sure you select same refrigerant type as what the vehicle
contains, or serious contamination in equipment tanks will be
caused.
Anytime you desire to shift from the refrigerant which machine
currently handles to another, turn the machine off and turn it on
again, and then select refrigerant type.
Notes
Each time the machine is turned on, it reminds to select refriger-
ant type. If the refrigerant type selected is different from the
refrigerant handled at previous operation, the machine automat-
ically recovers refrigerant inside machine pipelines, and makes
extremely deep internal evacuation, and then shifts to the
interface of the selected refrigerant. This process may take 10
minutes or more.
●
Select
refrigerant

9
When machine is switched on, filter-drier life is displayed. Click
OK to enter main menu.
●
Main menu.（in right-upper part the weight of other refrigerant
is displayed)
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Suction
Charge
Total refrigerant recovered: 15.85Kg / 34.76Lb
Refrigerant can be recovered till filter-drier
change: 84.15Kg / 185.02Lb OK
Change filter-drier

10
Empty used oil vessel before the recovery function is started.
Select “Recovery” function icon and press ENTER to start the
process.
The recovery process recovers the refrigerant from vehicle
A/C system, until vacuum degree is achieved in the vehicle
A/C system. Moisture, oil and foreign particles are separated
from the refrigerant before it is stored in the internal refrigerant
cylinder. The machine should be left connected on the vehicle
for a minimum time of 3 minutes (longer in cold climates) for
any pressure increase test. If after 3 minutes (or longer if possi-
ble) there is no pressure increase, the recovery can be
acknowledged completed. If a pressure increase is detected
recovery should be processed again.
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Recovery
Select “Vacuum” icon in the main menu, set vacuum time and
click OK to start the process.
The Vacuum process evacuates system, and makes system
ready for oil injection and refrigerant charge. Although it is up
to users to determine vacuum time, a longer vacuum process
is recommended.
After vacuum, the machine prompts to inject oil by turning the
new oil vessel hand valve at the machine side for fuel vehicles;
For hybrid and electric vehicles, oil injection through the
machine is prohibited, and it is recommended to inject oil with
specialized oil injection tool.
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Vacuum
Select “charge” icon and click OK to start the process.
According the vehicle being serviced, select “Normal charging”
(Fuel vehicles) or “High voltage charging” (Hybrid or electric
vehicles). In normal charging mode, hose flush (flush with
liquid refrigerant to remove the oil residue inside the service
hoses) is optional; while in high voltage charging mode, hose
●
●
Charge
PAG oil for fuel vehicle is electricity-conductive. Very few PAG
oil being injected into hybrid / electric vehicle could bring about
serious consequence.
Warning

11
flush before oil injection and refrigerant charging is a must.
You can manually set charge amount with volume, or select
“Charge by database” to set charge amount by car make and
model.
You can choose to charge through high side, low side or both
sides.
After charge and A/C performance is checked with engine
started and A/C turned on. “Hose purge” is performed to help
charge the refrigerant in service hoses into vehicle A/C system,
to ensure better charge precision.
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●
●
Select Tank fill to fill or add refrigerant into machine storage
cylinder. It is recommended to maintain 4-6 kg refrigerant in
the machine internal cylinder at all time, to guarantee better
charging and flushing operations. During the refrigerant
cylinder filling process the machine will display to the techni-
cian to close hand valve on the external cylinder, the machine
will then recover the rest of refrigerant left in the transfer
service hose and internal pipelines.
The minimum tank fill set value is 0.5kg.
The maximum tank fill set value is the calculation result of 8kg
(80% of tank allowable maximum weight) minus amount of
refrigerant the tank contains ( For example, if there is 2kg
refrigerant in the equipment tank, the maximum tank set value
is 6kg).
Remarks:
For machine with optional in-built HFO-1234yf identifier, before
the tank fill of HFO-1234yf happens, the machine makes
120-second gas identification. If the HFO-1234yf concentra-
tion is higher than 98%, the tank fill is permitted and started;
otherwise, the tank fill is prohibited, an internal vacuum is
made, and the gas concentration is displayed.
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●
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Tank fill
Empty used oil vessel before the process.
You can select “Auto.mode” to do full cycle of recovery, vacuum,
oil injection and charge.
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Auto. mode

Select “system setting” icon and input PW 111111 (left and right
arrow to move cursor, up and down arrow to increase / decrease
number) to enter system setting menu. In system setting,
“Language”, “Calibration”, “Database”, “Unit set”, “Empty container
weight set” and “Component test” can be inquired or reconfigured.
12
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Language:
Can change operation system language.
Calibration:
It is suggested to have only professional technicians to do
calibration of load cells. The load cell calibration is very simple
and fast, with just one step, 1kg weight calibration step.
Warning:
Misoperation in calibration could bring about serious conse-
quences to equipment or vehicle A/C system.
Database:
Users can access database of refrigerant / oil volume of differ-
ent car makes and models.
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●
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●
You can select “Auto.mode” to do full cycle of, recovery, vacuum
and charge.
According the vehicle being serviced, select “Normal charging”
(Fuel vehicles) or “High voltage charging” (Hybrid or electric
vehicles). In normal charging mode, hose flush (flush with
liquid refrigerant to remove the oil residue inside the service
hoses) is optional; while in high voltage charging mode, hose
flush before oil injection and refrigerant charging is a must.
In Auto. mode, the machine makes recovery, vacuum, oil
injection (for fuel vehicles) and refrigerant charge in sequence
automatically, with data preset by users.
Empty used oil vessel before the process.
System
setting

13
Unit set:
To set metric or American imperial unit. The two numbers
displayed in the bottom part of the interface are values of two
tank load cells, for load cell diagnosis purpose.
Empty container weight set:
The total load cell reading equals the sum of empty container
weight and net refrigerant content value. Thus, increase/de-
crease empty container weight, can correspondingly decrease /
increase refrigerant value displayed in the main operation
interface.
Component test:
Users can activate / dis-activate different electronic component
of the machine. This is for quick and easy diagnosis for trouble-
shooting.
Altitude:
Set altitude, to ensure accurate refrigerant identification.
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MAIN TROUBLESHOOTING
14
Reasons SolutionMalfunction
Low vacuum
degree.
Insufficient vacuum pump
oil.
Pump oil emulsion, dirty.
Pump oil inlet plugged.
Leakage in pump
connection.
Components worn out.
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●
Add oil to central line.
Put new oil.
Clean oil inlet.
Check connection.
Maintain the machine, especially
o-ring, washer and other sealing
parts.
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No change
in recovery
volume.
No refrigerant in A/C.
Support screw of gas
cylinder load cell not
loosened.
Gas cylinder load cell not
work or PCA failure.
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Stop recovery.
Unscrew the protection screw,
as chapter “Operation prepara-
tions”.
Calibrate gas cylinder load cell,
or change the load cell, or
change PCA.
●
●
●
Recovery
does not stop.
Leakage in automotive
A/C or equipment
pipeline.
Compressor not work.
Pressure sensor does not
work.
Remarks:
In winter, it is normal that
recovery takes longer time.
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●
Make leakage test. Machine
leakage test with reference to
service manual.
Change compressor.
Fasten pressure sensor connec-
tion to PCA, or change the
pressure sensor.
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No display.
Fused (in Power cable
connection box, or PCA).
PCA burnt.
Power cable loosened.
LCD not work.
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Change fuses.
Change PCA.
Connect power cable reliably.
Change LCD.
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●
Vacuum pump
inject oil.
Excessive oil volume.
Entrance pressure too
high.
●
●
Discharge some oil to proper
level.
Run Recovery function first.
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●

15
Reasons SolutionMalfunction
While auto
A/C has
refrigerant,
equipment
displays
alarm 005.
Low pressure switch plug
disconnected from PCA
socket.
●Fasten low pressure switch plug. ●
During
recovery,
vacuum pump
is pressurized.
After period
too much oil in
vacuum pump.
The contact between
solenoid valve #8 and
valve base is not well
sealed.
●Remove solenoid #8 from valve
base, clean the solenoid valve
and valve base.
●
No charge or
slow charge.
Insufficient refrigerant in
equipment.
Charge line problem.
●
●
Fill equipment tank with more
refrigerant.
Check charge line, including
tank red valve, tank red hose,
solenoid #5, solenoid #9 (high
side), solenoid #11 (long side),
service hoses and HP/LP quick
couplers.
●
●
High pressure
alarm 004 but
gas cylinder
gauge does
not show
excessive
pressure
value.
High pressure switch
plug disconnected from
PCA socket.
Pipeline connecting
compressor exit blocked.
●
●
Fasten high pressure switch
plug.
Inspect the hoses and connec-
tions between compressor exit
and tank blue hand vale.
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●

16
Remarks:
Reg
ular maintenance by specialized technicians may largely reduce machine
failure.
Reasons SolutionMalfunction
During
vacuum, there
is suction in
old oil bottle.
The contact between
solenoid valve #2 and
valve base is not well
sealed.
●Remove solenoid #2 from valve
base, clean the solenoid valve
and valve base.
●

17
Be careful not to rub the product against rough surfaces or
wear the product, especially the sheet metal housing.
Please regularly check the product parts that need to be
tightened and connected. If found loose, please tighten it in
time to ensure the safe operation of the equipment. The exter-
nal and internal parts of the equipment in contact with various
chemical media should be frequently treated with anti-corrosion
treatment such as rust removal and painting to improve the
corrosion resistance of the equipment and extend its service
life.
Comply with the safe operating procedures and do not
overload the equipment. The safety guards of the products
are complete and reliable.
Unsafe factors are to be eliminated in time. The circuit part
should be checked thoroughly and the aging wires should be
replaced in time.
Adjust the clearance of various parts and replace worn
(broken) parts. Avoid contact with corrosive liquids.
When not in use, please store the product in a dry place. Do
not store the product in hot, humid, or non-ventilated places.
Our products are made of long-lasting and durable materials, and
we insist on perfect production process. Each product leaves the
factory after 35 procedures and 12 times of testing and inspec-
tion work, which ensures that each product has excellent quality
and performance.
To maintain the performance and appearance of the product, it is
recommended that the following product care guidelines be read
carefully：
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MAINTENANCE SERVICE
Maintenance