DUOYI Digital Manifold Gauge Set User Manual

1. Introduction

The DUOYI Digital Manifold Gauge Set is an advanced instrument designed for the installation, testing, and maintenance of various refrigeration equipment, including air conditioners, refrigerators, and cold storage units. This digital gauge offers precise measurements and a range of functions to streamline HVAC and refrigeration tasks.

Figure 1.1: Wide range of applications for the Digital Manifold Gauge Set.

2. Product Features

This digital manifold gauge set is equipped with a variety of features to enhance its functionality and user experience:

• Comprehensive Testing: Supports double pressure test, dual temperature test, and pressure leakage test.
• Digital Readout: Provides clear and precise digital readings for all measurements.
• Multi-Unit Switching: Allows automatic conversion between various pressure units (kPa, Mpa, bar, inHg, PSI) and temperature units (Celsius/Fahrenheit).
• Built-in Refrigerant Database: Contains data for 89 types of refrigerants, enabling accurate calculations and settings.
• Visual Window: Features a visible window for observing the refrigerant filling status.
• Advanced Processing: Incorporates a 32-bit digital processing unit and high-precision data acquisition for stability.
• Large LCD Display: Equipped with a large, backlit LCD for easy data viewing in various conditions.
• Durable Design: Constructed with high-strength engineering plastics and flexible non-slip silicone, featuring a convenient hook design for portability.
• Vacuum Measurement: Capable of testing the percentage of vacuum measurement and recording leak time rates.

Figure 2.1: Overview of the HVAC Digital Gauge's functions.

3. Package Contents

Upon opening the package, please verify that all the following items are included:

• 1 x DUOYI Digital Manifold Gauge
• 3 x Tricolor Hoses (Red, Yellow, Blue)
• 2 x Pairs of Temperature Control Clamps
• 1 x Carrying Toolbox
• 1 x User Manual

Figure 3.1: All components included in the DUOYI Digital Manifold Gauge Set package.

4. Setup

4.1 Component Identification

Familiarize yourself with the different parts of the digital manifold gauge:

Figure 4.1: Labeled components of the Digital Manifold Gauge.

1. 1/4 Inch Low Pressure Inlet
2. 1/4 Inch High Pressure Inlet
3. Pressure Release Valve
4. Refrigerant Inlet/Vacuum Pump Inlet
5. Clamp-On Temperature Probe Socket
6. Clamp-On Temperature Probe Socket
7. Hook Design
8. Low Pressure Valve
9. Refrigerant Observation Window
10. High Pressure Valve
11. Button Display
12. LED Display

4.2 Battery Installation

The digital manifold gauge requires 4 AA batteries for operation. Please note that batteries are not included in the package. To install:

1. Locate the battery compartment on the back of the unit.
2. Open the battery compartment cover.
3. Insert 4 AA batteries, ensuring correct polarity (+/-).
4. Close the battery compartment cover securely.

4.3 Connecting Hoses and Clamps

Connect the tricolor hoses and temperature clamps as required for your specific application:

• Connect the blue hose to the low-pressure inlet (LOW).
• Connect the red hose to the high-pressure inlet (HIGH).
• Connect the yellow hose to the refrigerant inlet/vacuum pump inlet.
• Plug the temperature control clamps into the designated sockets (5 and 6) for temperature measurements.

5. Operating Instructions

5.1 Power On/Off and Display

• Press the Power button to turn the unit on or off.
• The large LCD display will show various test data, and the backlight can be activated for improved visibility.

5.2 Unit Switching

• Press the UNIT button to cycle through different pressure units (kPa, Mpa, bar, inHg, PSI).
• Press the °C/°F button to switch between Celsius and Fahrenheit temperature units.

5.3 Refrigerant Type Selection

Before performing tests or filling refrigerant, select the appropriate refrigerant type from the built-in database:

• Press the R+ or R- buttons to navigate through the 89 available refrigerant types.
• Ensure the selected refrigerant matches the system you are working on for accurate readings and calculations.

Figure 5.1: Built-in 89 kinds of Refrigerant Database.

5.4 Pressure and Temperature Testing

5.4.1 Condensing Pressure & Temperature Test

This test measures the minimum pressure and maximum temperature when the refrigerant changes from gas to liquid. Lower values indicate higher efficiency of the refrigeration cycle.

5.4.2 Evaporation Pressure & Temperature Test

This test measures the maximum pressure and lowest temperature when the refrigerant changes from liquid to gas. Lower values indicate higher efficiency of the refrigeration cycle.

Figure 5.2: Evaporation/Condensing Pressure and Temperature Test display.

5.4.3 High/Low-Pressure Temperature Test

The gauge can test the temperature within the high-pressure and low-pressure pipelines of the air conditioning system using the connected temperature clamps.

5.5 Pressure Leakage Test

To determine if there is a refrigerant leak, the gauge calculates the pressure difference between an initial test pressure and a second test pressure over a period of time.

Figure 5.3: High/Low Pressure Temperature Test and Pressure Leakage Test display.

5.6 Refrigerant Filling with Visual Window

The integrated visual window allows you to observe the refrigerant filling status, ensuring proper charge levels.

• Connect the yellow hose to the refrigerant source.
• Open the necessary valves to begin filling.
• Monitor the refrigerant flow and state through the observation window.

6. Maintenance

6.1 Cleaning

• Wipe the unit with a soft, damp cloth. Do not use abrasive cleaners or solvents.
• Ensure all ports and connections are free from debris before and after use.

6.2 Storage

• Store the digital manifold gauge set in its provided carrying toolbox to protect it from dust, moisture, and physical damage.
• Remove batteries if the unit will not be used for an extended period to prevent leakage.

7. Troubleshooting

If you encounter issues with your DUOYI Digital Manifold Gauge Set, refer to the table below for common problems and their solutions.

Note: It is normal for test data to have an error within 3% compared to actual data. This can be influenced by various factors such as the test environment and the integrity of the test line connections.

8. Specifications

Detailed technical specifications for the DUOYI Digital Manifold Gauge Set:

9. Warranty and Support

9.1 Warranty Information

DUOYI provides a 2-year after-sales service for this product, ensuring support and assistance for any manufacturing defects or issues that may arise during normal use. Please retain your proof of purchase for warranty claims.

9.2 Customer Support

For technical assistance, troubleshooting, or warranty inquiries, please contact DUOYI customer support through the official channels provided at the time of purchase or on the DUOYI brand website. When contacting support, please have your product model number (517kc) and purchase details ready.