Key facts
- Brand
- testo
- Model
- testo 550
- Category
- Other Electronics
- Documents
- 4
- Languages
- EN · PT
- Last added
- 2023-10-17
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testo 550s / 557s Digital Manifold Instruction Manual
The testo 550s and testo 557s are digital manifolds designed for maintenance and service work on refrigeration systems, heat pumps, and air conditioning systems. These instruments replace mechanical manifolds, thermometers, and pressure/temperature charts, allowing users to apply, adapt, test, and monitor pressures and temperatures. They are compatible with most non-corrosive refrigerants, water, and glycol, but not with ammonia-containing refrigerants.
The manual details the operation of the instruments, including inserting batteries, switching the device on and off, and using the setup wizard. It covers various measurement modes such as Refrigeration, Evacuation, Pressure Leak Test, Target Superheat, Compressor Test (DLT), and Delta T. Additionally, it explains how to use the integrated Bluetooth connection with the testo Smart App and Smart Probes, as well as settings for duration, brightness, and units.
testo 550 specifications
| Pressure measuring range | -100 to 6000 kPa / -0.1 to 6 Mpa / -1 to 60 bar (rel) / -14.7 to 870 psi |
|---|---|
| Temperature measuring range | -50 to +150 °C / -58 to 302°F |
| Vacuum measuring range | -1 to 0 bar / -14.7 to 0 psi |
| Power supply | 4x 1.5 V, type AA/mignon/LR6 |
| Battery life | approx. 250h |
| Operating temperature | -20 to 50 °C / -4 to 122 °F |
| Bluetooth Range | > 20 m (free field) |
All testo 550 documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
Can the testo 549 and testo 550 be used with ammonia?
No, the instruments are not compatible with refrigerants containing ammonia.
Who is authorized to use the testo 549 and testo 550?
They may only be used by qualified authorized personnel.
Can the testo 550s and 557s be used with ammonia refrigerants?
No, the instruments are not compatible with refrigerants containing ammonia.
What is the battery life of the instrument?
Battery life is greater than 250 hours with the display and Bluetooth off, and greater than 100 hours with them on.
What is the maximum torque for connecting refrigerant hoses?
The maximum torque is 5.0 Nm (3.7 ft*lb).
Which refrigerants are not measurable by this instrument?
Ammonia (R717) and other refrigerants containing ammonia are not measurable.