AUTOOL LM120+ Digital Manifold Gauge User Manual

AUTOOL LM120+ Digital Manifold Gauge

All rights reserved! Without the written approval of Shenzhen AUTOOL Technology Co., Ltd., no company or individual may copy or back up this manual in any form (electronic, mechanical, photocopying, recording, or other forms). This manual is specially designed for the products of AUTOOL, and our company will not be liable to the consequences caused by using this manual as the operating instructions for other equipment.

• If the device is damaged or lost owing to an accident caused by the user or a third party, abuse, misuse, unauthorized modification or random repair of the device, or failure to follow the operation and maintenance requirements of AUTOOL, our company and its branches will not be liable to any cost caused by these conditions.
• Formal statement: The other product names mentioned in this manual are used to explain how to use this device, and the registered trademark still belongs to the original mark owner.
• This equipment is designed for professional technicians or maintenance workers.

Trademark

• AUTOOL Technology Co, Ltd. has registered its trademark in many different countries, the trademark is AUTOOL. Any other trademark, service logo, domain name, icon or company name mentioned in this manual belongs to AUTOOL and its affiliated companies. In those countries where the trademark, service logo, domain name, icon and company name of AUTOOL has not been registered yet, we declare that they belong to AUTOOL.
• Any company or person shall not use the trademark, service logo, domain name, icon or company name of AUTOOL before getting the written approval of AUTOOL. Please visit our website www.autooltech.com or contact us at aftersale@autooltech.com.

Overview

• Intelligent electronic refrigerant group instrument is an auxiliary instrument for the installation, testing and maintenance of refrigeration equipment such as air conditioners and cold storage. The instrument has double pressure test, dual temperature test, digital readout, multi- unit switching, multi-mode function and built-in refrigerant database.
• The instrument uses high-strength engineering plastics and flexible non-slip silicone design, the whole machine is solid and comfortable to hold. Built-in 32-bit digital processing unit and high-precision data acquisition unit, high data and stability. Large-size liquid crystal display, LCD backlight support, data display clear and easy to read, convenient light operation. Long-life valve switch, 1/4-inch standard interface design to ensure that the instrument’s durability and versatility.
• The instrument can measure double pressure (gauge pressure) at the same time, as well as dual temperature measurement, with automatic multi-unit pressure conversion, automatic conversion of temperature Celsius / Fahrenheit, to facilitate different needs. Built-in 89 kinds of refrigerant pressure-evaporation temperature database, also calculate the subcooling superheat, to facilitate direct reading of operating process data. Also it tests percentage of vacuum measurement; pressure leak measurement, leak time speed record. It is deserved to have this multi- functional, accurate and simply operated digital manifold let you do the job right.

Safety rules and precautions

This manual includes the use of instrument instructions and warnings for safe operation and maintenance. Failure to use the meter in accordance with the manual may damage the instrument. This instrument strictly follows the IEC/EN61010-1 safety standards for design and production.

1. The pressure measured by the digtal manifold pressure tester is gauge pressure.
2. Pressure testing ranges from -101Kpa to 6Mpa (- 0.1bar to 60bar).
3. The limit pressure is 10 Mpa (100 bar).
4. The maximum operating pressure of standard hose is 600 PSI ( approximate 4.13 Mpa, 41.3 bar ). The limit pressure is 3000 PSI approximate 20.68 Mpa, 206.8 bar ).
5. Please confirm the rated pressure value of the tested equipment before testing. Do not use it if it exceeds the range of the instrument. If the packed hoses does not match the pressure requirement, you can use suitable replacements for testing.
6. Do not use and store the instrument in high temperature, high humidity, flammable, explosive and strong electromagnetic fields.
7. Please do not change the instrument internal circuit, to avoid any damage of the instrument or danger occurring.
8. Please wear qualified protective equipment to protect user during testing. Please use the instrument in a well-ventilated environment to prevent inhalation of toxic gases.

International electrical symbols

Product specifications

• Pressure test : gauge pressure
• Pressure test unit : Kpa; Mpa; bar; inHg; PSI. Pressure test range: 0 Kpa – 6000 Kpa Pressure test resolution: 1 Kpa
• Pressure test accuracy : +/- 0.5 %(FS)+ 5dgt
• Pressure overload limit: 10000 Kpa (10 Mpa; 100 bar;)
• Vacuum test : relative vacuum
• Vacuum test unit : Kpa; Mpa; bar; inHg; PSI. Vacuum test range: -101 Kpa – 0 Kpa Vacuum test resolution: 1 Kpa
• Temperature test unit : °C (Celsius), °F (Fahrenheit) Temperature test range: -40°C–150°C (-40°F–302°F)
• Temperature test resolution:
  • 0.1°C (-40°C–99.9°C), 1°C (100°C–150°C)
  • 0.1°F (-40°F–99.9°F), 1°F (100°F–302°F)
• Temperature test accuracy: +/- 0.5 °C + 2dgt
• +/- 0.9 °F + 2dgt Built-in 89 kinds of refrigerant NIST: According to American NIST standard

According to American NIST standard

401 B
R 401 C| R 402 A| R 402 B| R 403 A| R 403 B| R 404 A| R 405 A| R 406 A| R 407 A| R 407 B
R 407 C| R 407 D| R 407 E| R 408 A| R 409 A| R 409 B| R 41| R 410 A| R 410 B| R 411 A
R 411 B| R 412 A| R 413 A| R 414 A| R 414 B| R 415 A| R 415 B| R 416 A| R 417 A| R 418 A
R 419 A| R 420 A| R 421 A| R 421 B| R 422 A| R 422 B| R 422 C| R 422 D| R 423 A| R 424 A
R 425 A| R 426 A| R 427 A| R 428 A| R 50| R 500| R 501| R 502| R 503| R 504
R 507 A| R 508 A| R 508 B| R 509 A| R 600| R 600 A| R 717| R 744 ( Co 2 )| R 1234|

Power Supply: 4 X 1.5V (SIZE.AA / LR6) Dimensions: 170 110 50mm weight: 950g

Product Icon and description

1. Clamp-on temperature probe socket.
2. Clamp-on temperature probe socket.
3. LCD display.
4. Run/Stop button: In Leak Test Mode, Test Control Button.
5. Function button: test function mode switch button.
6. R+/R-Refrigerant Type Selection Buttons: Switch to select different types of working refrigerants.
7. Unit button: pressure unit switch button.
8. °C/°F button: temperature unit switch button.
9. Zero button: pressure display zero button.
10. Backlit button.
11. Power button.
12. Refrigerant observation window.
13. Low pressure valve.
14. High pressure valve.
15. 1/4 inch low pressure inlet.
16. 1/4 inch high pressure inlet.
17. Pressure release valve.
18. Refrigerant inlet/vacuum pump inlet.

Function instructions

Refrigerant filling and pressure inspection

• A. Turn off the blue valve and red valve.

• B. Power on the instrument. Then make sure if the LCD displays pressure test status as below picture. If not, press the Function button to switch it.

• C. If the temperature probe accessories have been connected to the instrument, the real-time temperature will be displayed. If not, no display of it.

• D. Press R+/ R- buttons , Unit button and °C/°F button to select tested refrigerant and reading display respectively.

• E. When the instrument is turned on, there may be 10 digits in the high and low pressure display area. At this time, press the zero button long until it returns to zero.

• F. Connect the instrument to the refrigeration system according to the chart below. (pay attention to the direction of the refrigerant flowing !!!!! )

• G. Turn on the refrigerant valve and gently press the pressure release valve to vent the air in the connecting hose.

• H. When the refrigeration system stops, turn on the high pressure valve
  (red valve) and fill with a certain amount of refrigerant and then shut the valve quickly.

• I. Run the refrigeration system, turn on the low pressure valve (blue valve), and fill with the refrigerant into the refrigeration system. Vacuum operation is required if it is filled initially or in full with refrigerant. Refer to the section on vacuum operation.

• J. After the filling is completed, shut the low pressure valve (blue valve) and refrigerant valve. Let the refrigeration system running.

• K. Shut down the refrigeration system, make sure all valves are turned off , then disconnect the instrument between refrigeration system and source. Do not remove the high pressure valve connection until the pressure drops to the safe point. Then turn off the instrument.
  Note: The filling operation of different equipment or refrigerants may vary. Please read carefully the relevant specific operation requirements for filling operation, so as to avoid damage to user or equipment caused by improper operation! ! !

The instrument can display the corresponding Evaporation Temperature (EV) and Condensation Temperature (CO) during the refrigerant pressure test, as shown below:
If the clamp-on temperature probes are connected to the instrument, LCD will display the real-time temperature in the spot T1 Sensor and T2 Sensor, as shown below.
Please make sure clamp-on temperature probes are connected as step F and contacted fully to the refrigeration pipes.
The instrument can calculate the SH – Superheat and SC – Subcooling as shown below as long as the tested refrigerant is preset and clamp-on temperature probes are connected well.

Vacuum operation

• A. Turn off the blue valve and red valve.

• B. Power on the instrument. Then make sure if the LCD displays vacuum test status as below picture. If not, press the Function button to switch it.

• C. Press the unit button to adjust the reading unit.

• D. When the instrument is turned on, there may be 10 digits in the high and low pressure display area. At this time, press the zero button long until it

• E. Connect the instrument to the refrigeration system according to the chart below. (pay attention to the direction of the refrigerant flowing!!!!! )
  (Connected clamp-on temperature probes will not affect the operation..) returns to zero.

• F. Turn on the blue valve and red valve, and start the vacuum pump.

• G. After the vacuum operation is completed, turn off the blue valve and red valve, then shut the vacuum pump.

• H. At this time, pressure leak test mode can be used to check leakage in the system ( Please refer to 6-3. Pressure Leak Test).

Pressure Leak Test

• A. The instrument is power on with the blue and red valves turned off.
• B. Press the Function button to pressure leak test mode shown as below. The current pressure value is displayed at lower right corner of LCD.
• C. Press the Run/Stop button to start the leak test, as shown below:

At this time, the lower left corner records the initial pressure value; the
lower right corner shows the instantaneous pressure value; the “ΔP” display area shows the difference between initial pressure value and instantaneous pressure value.
The time display area shows how long the leak test lasts in the format of Hour : Minute (HH:MM). All the pressure units on the screen are the same. You can switch different pressure units by pressing the unit button.

Common problems

Low battery power supply
The instruments has low power sign. When it is displayed , it means the battery power is insufficient. At this time, the battery should be replaced as required in order to avoid affecting normal use.

Damaged refrigerant hose or valve stem

Please check the pipe fittings and the hoses before testing. Once any damage is found , please replace it immediately to avoid improper use or any accident occurring.

Failure of refrigerant filling

There is a valve core in the refrigerant inlet of the refrigeration system. When connecting the instrument, pay attention to the two terminals of the hoses. Connect one terminal with a core to the refrigeration system, while another terminal without a core to the instrument.

Potential leak points

• Every hose terminal comes with a nylon pad that is limited a certain life of using. Over use or other situation will make it defective, which result in leakage.
• The instrument refrigerant inlet (the middle port of the instrument ) has a port with valve core , which is used to vent the air in the hoes after connecting the refrigerant to the instrument.
• The port is equipped with a copper plug screw. It is required to tighten it every time before or after operation.
• Check the refrigeration system’s pipes and connectors.

Glossary

Saturation

• The state of saturation is the coexistence of a refrigerant in a liquid and gas state.
• Condensation temperature and evaporation temperature Condensation temperature: in the condenser, the refrigerant is condensed by the high-temperature gaseous refrigerant to the temperature of the liquid refrigerant, that is, the saturation temperature under the condensing pressure.
• Evaporation temperature: in the evaporator, the refrigerant evaporates from the liquid refrigerant to the temperature of the gaseous refrigerant, that is, the saturation temperature under the evaporation pressure.

Degree of subcooling and superheat

• Subcooling: condensing temperature – condensing outlet temperature.
• Superheat: evaporation outlet temperature – evaporation temperature.
• The lower subcooling can make the refrigeration capacity of the system better. Adding subcooling circuit and economizer in the refrigeration system is to increase the subcooling for refrigerant increasing.
• Every hose terminal comes with a nylon pad that is limited a certain life of using. Over use or other situation will make it defective, which result in leakage.
• The degree of expansion of the expansion valve (refrigerant charge) affects the degree of superheat. The greater the degree of superheat, the smaller the opening of the expansion valve can be determined (the refrigerant charge is less).

Sensible heat and latent heat

The amount of heat required to raise the water temperature from 0 degrees to 100 degrees is sensible heat, the water is heated to 100 degrees, and the hot water becomes water vapor, but the temperature is still 100 degrees. The heat required for this process is called latent heat.

Gauge pressure and absolute pressure

• Gauge pressure: Gauge pressure refers to the pipeline pressure, refers to the pressure measured by pressure gauges, vacuum gauges, U-shaped tubes, etc., also known as relative pressure. The “table pressure” starts with atmospheric pressure and the symbol is Pg.
• Absolute pressure: The pressure directly acting on the surface of a container or object is called “absolute pressure”, the absolute pressure value is absolute vacuum as a starting point, the symbol is PABS (ABS is a subscript) and the absolute pressure is atmospheric pressure + gauge pressure.
• At atmospheric pressure, the gauge pressure is 0 and the absolute pressure is 1.013 bar.
• Dry bulb temperature, wet bulb temperature and black ball temperature Dry bulb temperature: the temperature measured by ordinary thermometers.
• Wet bulb temperature: a wet cloth is wrapped around the thermometer, and the temperature indicates a drop due to the evaporation of water. The temperature at this time is called the wet-bulb temperature.

After-sale Service Warranty

• We offer repair service or replacement according to the specific type of the fault.
• We guarantee that all the parts, accessories and device for replacement are brand new.
• AUTOOL will bear the shipping cost and offer the corresponding accessories for replacement without charge if the customer sends us video and pictures of the product that fails within 90days after receipt.
• If the product has been received for more than 90 days, we will provide the spare parts for replacement without charge but the buyer is supposed to bear the other relevant costs.

The warranty is void if the product is:

• Bought through non-official channel;
• Damaged because of improper use or maintenance not following the user manual;

Declaration

Please note that AUTOOL reserves the right to change product designs and specifications without notice. Images or descriptions in this manual are for illustration purposes only. Actual products may vary in terms of appearance and color. We are always trying to offer an accurate user manual, but we can hardly guarantee that there is absolutely no difference. The right of the final interpretation of the products belongs to AUTOOL, and we will not be liable to any loss or damage caused by misunderstanding.

www.autooltech.com

References

• AUTOOL: Inspect Before Car Repair

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