9.9.1 System requirements ............................................................................................... 66
9.9.1.1 Operating system ....................................................................................................................66
9.9.1.2 PC ............................................................................................................................................66
• The measuring instrument being dropped or any other comparable
mechanical stress may cause breakage of the pipe pieces in the refrigerant
hoses. The valve positioners may also suffer damage, causing further
damage inside the measuring instrument that is not necessarily visible
externally. Therefore, always replace the refrigerant hoses with new ones
after the measuring instrument is dropped or after any comparable
mechanical stress. For your own safety, you should return the measuring
instrument to the Testo Customer Service for technical inspection.
• Electrostatic charging may destroy the instrument. Integrate all the
components (system, manifold's valve block, refrigerant bottle, etc.) into the
potential bonding (earthing). Please see the safety instructions for the
system and the refrigerant used.
• Refrigerant gases can harm the environment. Please note the applicable
environmental regulations.
• Use with A2L refrigerants
Testo measuring instruments (as of July 2020) can be used in compliance
with the prescribed laws, standards, directives and safety regulations for
refrigeration systems and refrigerants as well as regulations of the
manufacturers of refrigerants of safety group A2L as per ISO 817.
Regional standardization and interpretation must always be observed.
For example, DIN EN 378-Part 1-4 applies to the scope of the EN
standards.
During maintenance work, the employer must ensure that a hazardous
explosive atmosphere is prevented (see also: TRBS1112, TRBS2152
VDMA 24020-3).
A hazardous and potentially explosive atmosphere must be anticipated
during maintenance and repair work on refrigeration systems with
flammable refrigerants (e.g. those of category A2L and A3).
Maintenance, repairs, removal of refrigerants and commissioning of
systems may only be carried out by qualified personnel.
Use
testo 550s and testo 557s are digital manifolds for maintenance and service
work refrigeration systems, heat pumps, and other air conditioning systems.
They may only be used by qualified authorized personnel.
The functions of the instruments testo 550s and testo 557s mean they can
replace mechanical manifolds, thermometers and pressure/temperature charts.
Pressures and temperatures can be applied, adapted, tested and monitored.
The instruments testo 550s and testo 557s are compatible with most non-
The instrument setup that is implemented can be adapted at any time
7.3
The instrument setup that is implemented can be adapted at any time
Instrument is switched on and the initialization phase has been
completed.
1
Select language: Press [▲] / [▼]
Switching the instrument on and off
7 First steps
Current
Action Function
status
Instrument
Press
Instrument is switched on.
When the measuring instrument is started for the first time, the setup
wizard guides you through the following setting parameters step by
step:
- Language
- testo Smart App
Press and hold
down (> 2 s)
in the Settings menu.
on
Setup wizard
When the testo 550s / testo 557s is started up for the first time and after the
factory settings have been reset, the setup wizard is activated and guides you
step-by-step through the following setup parameters.
in the Settings menu.
Language selection and QR code
and [Menu/Enter] to confirm.
Selecting the language activates
the appropriate presetting of the
units of measurement
mobile device of the testo Smart App
and press [Menu/Enter] to confirm.
Using the product
Preparing for measurement
Operating the valve positioners
With respect to the refrigerant flow path, the digital manifold behaves just like a
conventional four-way manifold: The passages are opened by opening the
valves. The applied pressure is measured with the valves closed and the valves
opened.
Open the valve: Turn valve positioner counterclockwise.
WARNING
Valve positioner tightened too tightly.
Damage to the PTFE seal (1).
Mechanical deformation of the valve
piston (2) leading to the PTFE seal (1)
falling out.
Damage to the thread of the threaded
spindle (3) and the valve screw (4).
Broken valve knob (5).
Only tighten the valve positioner hand-tight.
Do not use any tools to tighten the valve
positioners.
Risk of injury caused by refrigerant that is under high pressure, hot, cold,
or toxic!
>
>
>
>
psi).
8.2.1
Automatic mode
The manifold automatically detects the pressure difference between the lowpressure and high-pressure sides. If the measured pressure on the low pressure
side is 14.7 psi higher than on the high pressure side, a dialogue appears and
the display can be changed accordingly. If “yes” is selected, the low pressure
moves from left to right and the high pressure moves from right to left.
This mode is particularly suitable for air conditioning systems that provide
cooling and heating.
Measuring mode
WARNING
Wear protective goggles and safety gloves.
Before applying pressure to the measuring instrument: Always fasten the
measuring instrument on the suspension hook to prevent it from falling
(danger of breakage).
Before each measurement, check the refrigerant hoses are intact and
connected properly. Ensure seals are clean and intact. Do not use any tools
to connect the hoses; only tighten hoses hand-tight (max. torque
5.0 Nm/3.7 ft*lb).
Comply with the permissible measuring range (-1 to 60 bar/-14,7 to 870
Pay attention to this in systems with R744 refrigerant, since these are
frequently operated at higher pressures!
Refrigeration
The Refrigeration application is used to determine the following system
measuring values:
• High pressure
• Low pressure
• Refrigerant evaporating temperature
• Refrigerant condensation temperature
• Temperature of suction line
• Temperature of liquid line
• Superheating
• Subcooling
An NTC temperature probe (accessory) must be connected for
measuring the pipe temperature and for automatic calculation of
superheating and subcooling.
These can be fixed cable temperature probes or testo Smart Probes
The instrument is switched on and the measurement menu is
displayed.
All connections must be pressureless (ambient pressure).
1
Press [Menu/Enter] to confirm.
-
The main menu is displayed.
2
Press [Menu/Enter] to confirm.
3
Select Refrigeration and press
Before each measurement, check that the refrigerant hoses are in
perfect condition.
(e.g. testo 115i).
Before each measurement, zero the pressure sensors. All connections
must be pressureless (ambient pressure). Press the [▲] (P=O) key for
2 seconds to zero the sensors.
Users have the option of setting up favorite refrigerants on the
must be connected to the instrument via
instrument must remain closed.
-
The newly set refrigerant is displayed in the refrigerant list.
7
Press the [▲] (P=O) key for 2 seconds to zero the sensors.
-
Zeroing takes place.
8
Pressurize the measuring instrument.
-
The measurement starts
-
Measurement results are displayed:
[▼] to select the refrigerant and
press [Menu/Enter] to confirm.
instrument and in the app. These then appear at the beginning of the
refrigerant list.
To do this, the testo Smart App
Bluetooth.
In the refrigerant list (App), now choose the refrigerant as a favorite by
clicking on the star.
The new favorite refrigerant will now be synchronized to the testo 550s
or testo 557s.
Note: During synchronization, the refrigerant list/selection on the
automatically.
• Low/high pressure
• Condensation (CO) and evaporation temperature (EV)
is recommended for carrying out the measurement. The
The instrument is switched on and the measurement menu is
displayed.
Bluetooth® is enabled.
Hoses are connected.
1
[Menu/Enter]
2
Press [▲] / [▼] to select Measuring
8 Using the product
With zeotropic refrigerants, the evaporation temperature to/Ev is
displayed after complete evaporation. The condensation temperature
tc/Co is displayed after complete condensation.
The measured temperature must be assigned to the superheating or
subcooling side (t
<--> t
oh
cu
will show toh/T1 resp. Δtoh/SH or tcu/T2 resp. Δtcu/SC, depending on the
selected display.
Reading and display illumination flash:
• 1 bar/14.5 psi before reaching critical refrigerant pressure
• When max. permissible pressure of 60 bar/870 psi is exceeded.
All values can be saved and sent in the app. The data can also be
transferred between the app and the testo DataControl software.
Evacuation
Via the Evacuation application, foreign gases and moisture can be removed
from the refrigeration circuit.
The testo 552i
measurement is also possible without the testo 552i, with testo 550s/testo 557s.
accuracy.
However, this is not advisable due to insufficient
Smart Probe for measuring the air temperature can be connected. As a
8 Using the product
Once the measuring range 0 to
20,000 microns / 0 to 26.66 mbar is
reached, the current vacuum value is
shown on the instrument display.
The instrument also displays the
current ambient temperature, the
water evaporation temperature which
corresponds to the vacuum reading,
and the delta between these two
temperatures.
Press the [▲] New key to reset the determined values. If necessary, a
test can also be started again.
Pressure Leak Test
The temperature compensated leak test can be used to check the leak tightness
of systems. For this purpose both the system pressure and the ambient
temperature are measured over a defined period of time.
A temperature probe that measures the ambient temperature or a
result, information is provided about the temperature-compensated
differential pressure and about the temperature at the beginning/end of
the test. Due to the temperature compensation, the actual pressure
drop is displayed as delta P. If no temperature probe is connected, you
may also perform the pressure leak test without temperature
compensation.
Surface temperature probes (e.g. testo 115i) can also be used for the
temperature-compensated leak testing, but must not be used to
measure surface temperature. They must be positioned as far as
possible to measure the air temperature. If a surface probe is used, in
the Settings menu of the testo 550s / testo 557s, the Auto Tfac
(Temperature compensation factor) must be switched off, see
The instrument is switched on and the measurement menu is
displayed.
Hoses are connected.
1
Press [Menu/Enter].
2
Press [▲] / [▼] to select Measuring
-
The Measuring Mode menu is
3
Press [▲] / [▼] to select Pressure
-
For the temperature-compensated leak test, a connection is
compensated leakage testing.
The testo 550s or testo 557s manifold is used to carry out the
measurement.
Mode and press [Menu/Enter] to
confirm.
displayed.
Leak Test and press [Menu/Enter]
to confirm.
established with available Bluetooth® probes. If cable probes are
connected to the instrument, they are prioritized for the compensation.
Please note that only air probes are ideal for temperature-
testo 905i / testo 605i is switched on and automatically connected.
can be connected.
-
The Pressure Leak Test menu is displayed.
4
Press the [▼] (Start) key.
-
5
Press the [▼] (Stop) key.
-
The leakage test is terminated.
-
The measurement result is
6
Press [Menu/Enter] to return to the main menu.
Other temperature probes compatible with testo 550s / testo 557s
T Comp is shown on the display if a compatible probe is connected via
Bluetooth
measurement result.
The leakage test is carried out.
displayed.
®
or cable. The temperature compensation is used for the
24
Start the measurement once pressure has been achieved. Once
pressure has been reached, press start to enable the Pressure Leak
Test. This will begin the test and the clock.
Press the [▲] New key to reset the determined values. If necessary, a
test can also be started again.
The measurement result can be displayed graphically on the manifold
as well as in the app.
The instrument is switched on and the measurement menu is
displayed.
All connections must be pressureless (ambient pressure).
Bluetooth® is enabled.
1
Press [Menu/Enter].
2
Press [▲] / [▼] to select Measuring
8 Using the product
Target Superheat
This feature makes it possible to connect the testo 550s and testo 557s
manifolds to two additional testo 605i Smart Probes in order to calculate the
target superheat. This application can only be used for split air conditioning
systems/heat pumps with a fixed expansion valve. The two connected testo 605i Smart Probes determine the Outdoor Dry Bulb Temp (ODDB) and Return
Air Wet Bulb (RAWB) values. The target superheat value appears on the
display as a result.
The following are used for the measurement:
• testo 115i (clamp thermometer) or
• fixed cable probes
• testo 605i
Alternatively, the values can be configured manually.
Before each measurement, check that the refrigerant hoses are in
perfect condition.
Before each measurement, zero the pressure sensors.
Press [▲] / [▼] to select Target Superheat and press [Menu/Enter]
to confirm.
-
The Configure Target Superheat
4
Adjust values for Outdoor Dry Bulb Temp.
4.1
Press the [▲] key and in the Outdoor Dry Bulb Temp. field, select
4.2
Press [Menu/Enter] to confirm.
-
4.3
Press [▲] / [▼] to set the value.
4.4
Press [Menu/Enter] to confirm.
displayed.
menu is displayed.
26
The values can either be configured manually via Manual Input or
recorded by the testo 605i via Smart Probe. When a Smart Probe is
selected, available testo 650i instruments are displayed for the
connection.
The newly set refrigerant is displayed in the refrigerant list.
10
Press the [▲] (P=O) key for 2 seconds to zero the sensors.
-
Zeroing takes place.
11
Pressurize the measuring instrument.
-
The measurement starts automatically.
-
8.2.5
The instrument is switched on and the measurement menu is
displayed.
8 Using the product
[▼] to select the refrigerant and
press [Menu/Enter] to confirm.
Measurement results are displayed:
• Low/high pressure
• Condensation and evaporation temperature
• Suction and liquid line temperature
• Superheating and subcooling
• Target superheat TSH
Compressor Test (DLT)
For this mode, 3 temperature probes are used. In addition to the conventional
temperature sensors for superheating and subcooling, an additional temperature
probe must be connected via Bluetooth.
The testo 115i (clamp thermometer) or fixed cable probes are used to
carry out the measurement.
Before each measurement, check that the refrigerant hoses are in
perfect condition.
Before each measurement, zero the pressure sensors.
the App for iOS instruments in the App Store or for Android
8 Using the product
Order no. Designation
measurements on pipes (Ø ¼ to 1 ¼ inch), 5ft fixed
0613 1912 Waterproof surface temperature probe (NTC) for flat
Establishing a connection
®
To establish a connection via Bluetooth
smartphone with the testo Smart App installed on it.
You can get
instruments in the Play Store.
Compatibility:
Requires iOS 12.0 or later/Android 6.0 or later, requires
Bluetooth
®
4.0.
Once the connection between the app and the testo 550s and testo 557s has
been successfully established, the app is in second screen mode. This is
indicated by a yellow frame in the app.
This means that all measurement data from the manifold is being mirrored on
the app. The measurement can now be controlled from both instruments. It is
possible to carry out the following actions:
After opening the App, the instrument is automatically connected if it is
smartphone/tablet via settings beforehand.
8.3.3.2
The Bluetooth® menu is activated.
1
[Menu/Enter]
-
In the On/Off switch icon, is
displayed.
3
Disable Bluetooth®: Press [▼] to
-
When the Bluetooth® icon is not shown on the display, Bluetooth® is
switched off.
8.3.3.3
The Bluetooth® menu is activated (in the On/Off switch icon, is
1
Press [▼] to select Manual probe selection.
within range. The instrument does not have to be connected to the
Switching off
activate the [Competed] button and
press [Menu/Enter] to confirm.
Manual probe selection
If this menu is activated, it appears before a measurement.
displayed.
Enable function: Via [Menu/Enter], set the switch to [ON].
An info window with the available probes appears before each
measurement to be carried out. The information must be
confirmed by pressing [Menu/Enter]/[Okay].
Disable function: Via [Menu/Enter], set the switch to [OFF].
®
If the advanced Bluetooth
instrument automatically connects to the first compatible Smart
Probe.
Press [ESC]: 1x main menu view, 2 x measurement menu view
Unsaved readings are lost when the measuring instrument is switched
8.4.4
Surface temperature probe
An NTC temperature probe (accessory) must be connected to measure
The Settings menu is activated.
1
Select Auto Tfac and press
-
Menu properties are displayed.
On: The instrument automatically
switches off after 30 minutes of
inactivity.
The instrument switches off
automatically if no pressure is
pressed within 10 minutes. As
instrument remains on.
• Off: Continuous operation
off.
Auto Tfac (Temperature compensation
factor)
A surface compensation factor has been set in the measuring instrument to
reduce the measuring errors in the main field of applications. This reduces
measuring errors when using surface temperature probes.
the pipe temperature and to automatically calculate superheating and
subcooling.
The Main menu can be accessed via the icon at top left. To exit the main
menu, select a menu or right-click on the guided menus. The last screen
displayed is shown.
The testo Smart App has permanently installed measurement programs. These
enable the user to carry out convenient configuration and implementation of
specific measuring tasks.
The testo Smart App offers the following Measurement menus:
In the Basic view application menu, the current measuring values can be read,
recorded and saved. The Basic view is particularly suitable for fast,
uncomplicated measurements without the specific requirements of a standardcompliant measurement.
All Bluetooth® probes compatible with the testo Smart App are displayed in the
Basic view.
In all application menus, apart from the volume flow measurement, there are
three different screens for the measurement - Live (or also Basic view), Graphic
and Table.
Graphic view
In the Graphic view, the values for a maximum 4 channels can be displayed
simultaneously in a chronological trend graph. All measured parameters can be
displayed in the Graphic view via the channel selection (click on one of the four
selection fields). Once a measurement parameter has been selected, the value
is updated automatically.
The Zoom touch function allows individual parts of the graphic to be viewed in
more detail or time progressions to be displayed compactly.
• Condensation pressure: Measured temperature tcu/T2
• Condensation pressure: Subcooling Δtcu/SC
The testo 115i clamp thermometer is used for the measurement.
An NTC temperature sensor (accessory) must be connected for
measuring the pipe temperature and for automatic calculation of
superheating and subcooling. Testo Smart Probes (e.g. testo 115i) can
be used.
Before each measurement, check that the refrigerant hoses are in
flawless condition.
Before each measurement, zero the pressure sensors. All connections
must be pressureless (ambient pressure). Press the button [▲] (P=O)
for 2 seconds to zero the sensors.
You have the option of setting up favourite refrigerants in the App.
list (App).
7
Click on Start.
subcooling side (toh <--> tcu). Dependent on this assignment, the display
52
These then appear at the beginning of the refrigerant list.
To do this, click on the asterisk next to the refrigerant in the refrigerant
The newly set refrigerant is displayed in the refrigerant list.
The measurement starts.
Values currently being measured are displayed.
Measured values can be saved or a new measurement can be started.
With zeotropic refrigerants, the evaporation temperature to/Ev is
displayed after complete evaporation/the condensation temperature
tc/Co is displayed after complete condensation.
The measured temperature must be assigned to the superheating or
will show toh/T1 resp. Δtoh/SH or tcu/T2 resp. Δtcu/SC, depending on the
9.3.3
1
2
Click on Target superheat.
3
Reading and display illumination flash:
selected display.
• 1 bar/14.5 psi before reaching critical refrigerant pressure
• When max. permissible pressure of 60 bar/870 psi is exceeded.
Target Superheat
This feature allows the calculation of target superheat in conjunction with the
App and additional testo 605i Smart Probes. This application can only be used
for split air conditioning systems/heat pumps with a fixed expansion valve. The
two connected testo 605i Smart Probes determine the ODDB and RAWB
values. As a result, the target superheat appears in the App.
The following are used for the measurement:
• testo 115i (clamp thermometer)
• testo 605i
Before each measurement, check that the refrigerant hoses are in
flawless condition.
Before each measurement, zero the pressure sensors.
al pressure drop is displayed as delta P. If no temperature sensor is
connected, you may also perform the tightness test without temperature
1
2
Click on Leakage test.
3
9 Smart App
The measurement starts.
Values currently being measured are displayed.
Measured values can be saved or a new measurement can be started.
Pressure Leak Test
The temperature compensated tightness test can be used to check the leak
tightness of systems. For this purpose both the system pressure and the
ambient temperature are measured over a defined period of time.
For this purpose a temperature sensor to measure the ambient
temperature may be connected (recommendation: Deactivate the
surface compensation factor and use an NTC air probe or Bluetooth
temperature Smart Probes) or Smart Probe for air temperature
measurement. This provides information about the temperaturecompensated differential pressure and the temperature at the
beginning/end of the test. Due to the temperature compensation, the
actu
®
Surface temperature probes (e.g. testo 115i) can also be used for the
compensation.
temperature-compensated tightness testing, but must not be used for
measuring surface temperature. They must be positioned as far as
possible to measure the air temperature.
The 550i, 550s or 557s manifold is used to perform the measurement.
Measured values can be saved or a new measurement can be started.
Customer
In the Customer menu, all customer and measuring site information can be
created, edited and deleted. Fields marked with * are mandatory. Without any
information in this field, no customers or measuring sites can be stored.
Enter the customer name or measuring site or date/time in the search
1
2
Click on the required measurement.
3
4
Acknowledge the information.
9 Smart App
Memory
In the Memory menu, you can call up all the measurements stored on the
mobile device, analyze them in detail and also create and save csv data and
PDF reports. When clicking on a measurement, an overview of the
measurement results is displayed.
Searching for and deleting measurement
results
In the Memory menu, all stored measurements are sorted by date and time.
Click on .
Deleting
Search field with measurements opens.
field.
The result is displayed.
Click on .
A check box is displayed in front of each measurement.
All sensors used with the App can be found in the Sensors menu. There,
you can view general information about currently connected probes as well as
recently connected probes.
Information
Information is stored for each probe.
Click on .
62
Main menu opens.
Click on Sensors.
The Sensors menu opens.
Information is displayed about the model, order number, serial number
and firmware version.
Use the slider to activate or deactivate Update for connected
9.8.2
1
2
Click on Tutorial.
9 Smart App
The required settings are set.
Exit Privacy settings.
Help and Information
Under Help and Information, you will find information about the instrument, and
the tutorial can be called up and implemented. This also where legal information
can be found.
Instrument information
Click on Help and Information.
Automatic updates for instruments can be enabled or disabled.
The Help and Information menu opens.
The current App version, Google Analytics instance ID, refrigerant
version and update are displayed for the connected instrument.
Tutorial
instruments.
Click on Help and Information.
The Help and Information menu opens.
The tutorial shows you the most important steps prior to
commissioning.
The data protection information and licence usage information is
displayed.
testo DataControl archiving software
The free testo DataControl measurement data management and analysis
software enhances the functionality of the testo Smart App measuring
instrument with lots of useful functions:
• Manage and archive customer data and measuring site information
• Read out, evaluate and archive measurement data
• Presenting readings in graphic form
• Create professional measurement reports from the existing measurement
data
• Conveniently add pictures and comments to measurement reports
• Data import from and data export to the measuring instrument
System requirements
Administrator rights are required for installation.
Operating system
The software can be run on the following operating systems:
• Windows
• Windows® 8
• Windows
The computer must meet the requirements of the operating system in each
case. The following requirements must also be met:
• Screen with a resolution of at least 800 x 600 pixels
9.9.2
To transfer the data from the App to testo DataControl, both
1
Open testo Smart App on the smartphone or tablet.
2
Open the testo DataControl archiving software on the PC.
3
Click on Select instrument.
Procedure
instruments must be in the same network.
For example: A notebook with installed testo DataControl and a
smartphone with installed testo Smart App are connected to the same
WLAN.