1. Kupu Whakataki
The Testo 550s is an advanced digital manifold designed to meet the demands of HVAC professionals working on refrigeration and air conditioning systems, as well as heat pumps. Built for precision, efficiency, and ease of use, it streamlines system diagnostics by providing highly accurate pressure and temperature measurements. Its rugged, compact design ensures durability in harsh working conditions, while the large display allows for easy readability of all critical data at a glance.
With integrated Bluetooth connectivity, the Testo 550s enhances workflow efficiency by wirelessly transmitting measurement data to the Testo Smart App, where users can analyze results, generate reports, and store documentation in real-time. This seamless digital integration reduces manual errors, improves reporting accuracy, and simplifies system monitoring, making it an indispensable tool for professionals seeking to optimize their processes.
Designed for versatility, the Testo 550s is compatible with a broad range of refrigerants, including A2L refrigerants, ensuring compliance with modern industry standards.
2. He aha kei roto i te Pouaka
Your Testo 550s AC Manifold Gauge Set includes the following components:
- Instrument (Testo 550s Digital Manifold)
- 2 Wired Temperature Clamp Nga rangahau
- Pukapuka Kaiwhakamahi
- Pūhiko (4 AA)
- Hardshell Transport Case

Figure 2.1: Components of the Testo 550s Basic Kit, showing the digital manifold, two wired temperature probes, and the hardshell transport case.
3. Tatūnga
Follow these steps to set up your Testo 550s digital manifold:
- Kōkuhu Pūhiko: Whakatuwheratia te wāhanga pākahiko ka whakauru i ngā pākahiko AA e toru kua whakaratohia.
- Connect Temperature Probes: Attach the two wired temperature clamp probes to the designated ports on the manifold. These probes are essential for accurate temperature measurements and superheat/subcooling calculations.
- Hononga ngongo: Connect your refrigerant hoses to the appropriate high and low-pressure ports on the manifold. Ensure secure connections to prevent leaks.
- Whakahiko: Press the power button to turn on the Testo 550s. The display will illuminate, showing initial readings.
- Install Testo Smart App: Download and install the "Testo Smart" app on your smartphone or tablet from your device's app store. This app enhances functionality and allows for remote operation and data logging.
- Whakauruhia ma te Bluetooth: The Testo 550s features integrated Bluetooth connectivity. Open the Testo Smart App and follow the on-screen instructions to pair your manifold with your mobile device. This enables wireless data transmission and remote control.

Figure 3.1: The Testo 550s digital manifold is designed for user-friendly operation with a clear display, allowing for easy handling.

Figure 3.2: The manifold connected to an HVAC system, demonstrating its application for easy measurements on refrigeration, air conditioning systems, and heat pumps, thanks to its intuitive menu and automatic calculations.
4. Nga Tohutohu Whakahaere
The Testo 550s offers versatile measurement capabilities for HVAC and refrigeration systems. Here are key operating features:
- Inenga Tika: The manifold provides highly accurate readings for temperature (-58° to 302°F / -50 to +150°C) and pressure (-15 to 870 psi / -1 to 60 bar). Temperature accuracy is ±0.9°F (±0.5°C) and pressure accuracy is ±0.5% Full Scale.
- Automatic Calculations: With the connected temperature probes, the Testo 550s automatically calculates superheat and subcooling, simplifying diagnostics and system optimization.
- Hototahitanga Refrigerant: Supports most common refrigerant types, as well as A2L refrigerants, ensuring broad applicability.
- Whakauru Taupānga Ataata: Use the Testo Smart App for remote operation, real-time data visualization, graphical progression display, and intelligent error analysis. You can also generate and send reports directly from the job site.
4.1. Using the Testo Smart App
The Testo Smart App significantly enhances the functionality of your 550s manifold. It allows for:
- Mana Mamao: Operate the manifold and view measurements from a distance.
- Takitaki Raraunga: Record measurement data over time for detailed analysis.
- Whakaputa Pūrongo: Create professional reports with all relevant data, including graphs and tables.
- Whakahōu Firmware: Keep your manifold updated with the latest features and refrigerant profiles directly through the app.

Figure 4.1: Intelligent error analysis, wireless measurements, and graphical progression display on a large screen are all thanks to the app connection.
4.2. Pressure Leak Test
The Testo 550s supports pressure leak testing with temperature compensation. This feature is crucial for verifying system integrity after installation or repair.
Video 4.2.1: This official Testo video demonstrates the pressure leak test function of the Testo 550s and 557s digital manifolds, showing how to perform the test and interpret results for system integrity.
4.3. Refrigerant Selection and Updates
The manifold allows for easy selection of refrigerants directly on the device or through the app. New refrigerant profiles are automatically updated via the Testo Smart App, ensuring compatibility with the latest industry standards.
Video 4.3.1: This official Testo video explains how to manage refrigerant selection and automatic updates using the Testo 550s and 557s Smart App, ensuring your device is always up-to-date with the latest refrigerant profiles.
Video 4.3.2: This official Testo video provides a quick overview of the key highlights and features of the Testo 550s digital manifold, including its robust design, precise measurements, and smart app connectivity.
5. Tiaki
To ensure the longevity and accuracy of your Testo 550s, regular maintenance is recommended:
- Te horoi: Wipe the instrument and probes with a damp kakahu. Kaua e whakamahi i nga taputapu horoi taikaha.
- Rokiroki: Store the manifold and accessories in the provided hardshell case when not in use to protect them from damage.
- Whakakapinga Pūhiko: Whakakapihia nga pākahiko ina puta te tohu pākahiko iti ki te whakaaturanga.
- Whakatikatika: For continued accuracy, periodic calibration by a certified service center is recommended.
6. Te Raru
If you encounter issues with your Testo 550s, consider the following common troubleshooting steps:
- Kore Mana: Check if batteries are correctly inserted and charged. Replace if necessary.
- Nga Take Hononga Nihokikorangi: Ensure Bluetooth is enabled on both the manifold and your mobile device. Restart both devices and try pairing again. Make sure the Testo Smart App is up to date.
- Nga Panui Heke: Verify that probes are securely connected and properly clamped to the pipes. Ensure the correct refrigerant type is selected in the manifold settings or app. Consider if calibration is due.
- Leak Test Failure: Double-check all connections for tightness. Use a leak detection spray to pinpoint any small leaks in the system or manifold connections.
For persistent issues, refer to the detailed user manual or contact Testo customer support.
7. Whakatakotoranga
| Āhuahira | Taipitopito |
|---|---|
| Te Awhe Ine Pawera | -58° to 302°F (-50 to +150°C) |
| Tikanga Te Ine Marama | ± 0.9 ° F (± 0.5 ° C) |
| Awhe ine ine | -15 ki te 870 psi (-1 ki te 60 pae) |
| Te Tikanga Te Ine Pehe | ±0.5% Tauine Katoa |
| Ahu | 8.27 x 4.76 x 2.36 inihi (210 x 121 x 60 mm) |
| Taumaha | 29.14 oz (826 g) |
| Te Waahi Mahi | -4° to 122°F (-20 to +50°C) |
| Karaehe Tiaki | IP54 |
| Rauemi Whare | ABS/PA/TPE |
| Pūhiko | 4 pākahiko AA (kei roto) |
| Rahi Mata | 4.8 Inihi |
8. Pūtāhui me te Tautoko
Testo products are manufactured to high-quality standards. For detailed warranty information, please refer to the official Testo webte waahi, te kaari whakamana ranei kei roto i to hua.
For technical support, service, or additional inquiries, please visit the official Testo webpaetukutuku, whakapā atu ranei ki ta raatau tari ratonga kaihoko.
He putanga hiko o te pukapuka kaiwhakamahi e waatea ana hei tango: Testo 550s User Manual (PDF)





