This manual describes how to use testo 557 digital manifold, including safety and environment protection, product description, first steps, using the manifold, technical data, maintaining the product and tips and assistance
The testo 557 is a digital manifold designed for maintenance and service work on refrigeration systems and heat pumps. It replaces analog manifolds, thermometers, and pressure/temperature charts, allowing users to apply, adapt, test, and monitor pressures and temperatures. The device is intended for use by qualified personnel only and is compatible with most non-corrosive refrigerants, water, and glycol, but not with ammonia-containing refrigerants.
The manual covers safety precautions, product description, initial setup steps, and detailed usage instructions. It explains how to switch the instrument on, connect temperature and vacuum probes, select measuring modes, and operate the valve stem shutoffs. Additionally, it provides technical data regarding sensors, measuring ranges, accuracy, and supported refrigerants, along with maintenance tips and error reports.
| Pressure measurement range (rel) | -14.7…870 psi / -100…6000 kPa / -0.1…6 MPa / -1…60 bar |
|---|---|
| Temperature measurement range | -58…302 °F / -50…+150 °C |
| Vacuum measurement range (abs) | 0 … 20.000 micron |
| Number of supported refrigerants | 60 |
| Operating temperature | -4…122°F / -20…50°C |
| Bluetooth range | >20 m / 65 ft |
| Battery life | approx. 250h |
No, the testo 557 is not compatible with refrigerants containing ammonia, as they may damage the manifold.
The instrument is intended for use by qualified personnel only.