Testo 557 Operating Manual
testo 557 · Digital manifold
Instruction manual
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1 Contents
1 Contents
1 Contents ................................................................................................... 3
2 Safety and the environment .................................................................... 4
2.1. About this document ........................................................................ 4
2.2. Ensure safety................................................................................... 4
2.3. Protecting the environment .............................................................. 5
3 Product description ................................................................................. 5
3.1. Use .................................................................................................. 5
3.2. Overview ......................................................................................... 6
4 First steps ................................................................................................ 8
5 Using the manifold ................................................................................ 10
5.1. Preparing for measurement ........................................................... 10
5.1.1. Switching the instrument on ..............................................................................10
5.1.2. Connecting the temperature sensor .................................................................11
5.1.3. Connecting the vacuum probe ..........................................................................12
5.1.4. Switching Bluetooth® on and off.......................................................................12
5.1.5. Measuring mode ...............................................................................................13
5.2. Performing the measurement ........................................................ 13
6 Technical data ........................................................................................ 17
6.1.1. Bluetooth Modul ................................................................................................17
6.1.2. General technical data ......................................................................................18
7 Maintaining the product ........................................................................ 20
8 Tips and assistance............................................................................... 22
8.1. Questions and answers ................................................................. 22
8.2. Measurement parameters ............................................................. 22
8.3. Error reports .................................................................................. 23
8.4. Accessories and spare parts ......................................................... 23
9 EC declaration of conformity ................................................................ 24
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2 Safety and the environment
2 Safety and the environment
2.1. About this document
Use
> Please read this documentation carefully and familiarize
yourself with the product before putting it to use. Pay particular
attention to the safety instructions and warning advice in order
to prevent injuries and damage to the product.
Symbols and writing standards
Representation Explanation
Warning advice, risk level according to the
signal word:
Warning! Serious physical injury may occur.
Caution! Slight physical injury or damage to
the equipment may occur.
> Implement the specified precautionary
Menu
Elements of the instrument, the instrument
display or the program interface.
[OK]
Control keys of the instrument or buttons of
the program interface.
2.2. Ensure safety
> Do not operate the instrument if there are signs of damage at
the housing, mains unit or hoses.
> Do not store the product together with solvents. Do not use any
desiccants.
> Carry out only the maintenance and repair work on this
instrument that is described in the documentation.
> Dangers may also arise from the refrigeration systems being
measured or the measuring environment: Note the safety
regulations valid in your area when performing the
measurements.
> If the manifold falls or another comparable mechanical load
occurs, the pipe sections of the refrigerant hoses may break.
The valve stem shutoff may also be damaged, whereby further
measures.
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damage to the interior of the manifold may occur that cannot be
identified from the outside. The refrigerant hoses must therefore
be replaced with new, undamaged refrigerant hoses every time
the manifold falls or following any other comparable mechanical
load. Send the manifold to Testo Customer Service for a
technical check for your own safety.
> To prevent damage from ESD (electro-static discharge) or
transient voltage spikes make sure that your refrigeration
system is properly grounded, as otherwise the manifold might
2.3. Protecting the environment
get damaged.
> Dispose of spent batteries in accordance with the valid legal
specifications.
> At the end of its useful life, send the product to the separate
collection for electric and electronic devices (observe local
regulations) or return the product to Testo for disposal.
> Refrigerant gases can harm the environment. Please note the
3 Product description
applicable environmental regulations.
3 Product description
3.1. Use
Testo 557 is a digital manifold for maintenance and service work on
refrigeration systems and heat pumps. It is intended for use by
qualified personnel only.
The function of the testo 557 is designed to replace analog
manifolds, thermometers and pressure/temperature charts.
Pressures and temperatures can be applied, adapted, tested and
monitored.
Testo 557 is compatible with most non-corrosive refrigerants, water
and glycol. Testo 557 is not compatible with refrigerants containing
ammonia.
The instruments must not be used in explosive environments!
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3 Product description
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3.2. Overview
Display and control elements
1 Front connection for external vacuum probe
2 Mini-DIN probe socket for NTC temperature probe, with socket
cover
3 Foldable hanging hook (on rear)
4 Display. Instrument status icons:
Icon Meaning
/ /
Battery status
Bluetooth®
Select measuring mode
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3 Product description
5 Battery compartment. The rechargeable batteries cannot be
charged inside the instrument!
6 Control keys:
Ke y Function
[Set]
[R, ►, ■]
[Mode]
[Min/Max/Mean]
[▲]
[P=0]
Esc
[▼]
[ / ]
Set units
Select refrigerant / Start-Stop leak test
Switch between measuring modes
Display min, max, mean values
Up-key: Scroll through menu.
Pressure zeroing
Switches to the measurement/home view.
Down-key: Scroll through menu.
Switching the instrument on/off
Switching display ilumination on/off.
7 Sight glass for refrigerant flow.
8 4 x valve stem shutoff
9 4 x hose holders for refrigerant hoses
10 2 x Connection 1/4" SAE, brass.
High pressure, for refrigerant hoses with quick release screw
fitting, passage for valve actuator lockable.
11 Connection 3/8" SAE, brass, for vacuum pump
12 Connection 1/4" SAE, brass, for e.g. refrigerant cylinders
13 Mini-USB connection for firmware update, inside the battery
compartment.
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4 First steps
4 First steps
Inserting batteries/rechargeable batteries
1. Fold out the hanging hook and open the battery compartment
by squeezing the clip lock.
2. Insert batteries (included in delivery) or rechargeable batteries
(4x 1.5 V, type AA/Mignon/LR6) in the battery compartment.
Observe the polarity!
3. Close the battery compartment.
- After inserting the batteries, the instrument switches on
automatically and goes into the settings menu.
When not in use for long period: Remove batteries /
rechargeable batteries.
Units / Parameter selection
1. Press [Set] to confirm or change unit parameter settings
2. Press [▲]
or [▼] to change the units / parameters.
- The settings will be accepted once the last selection has been
made.
Key Functions Description
[▲] or [▼]
[Set]
Selectable
parameters
°C, °F
bar, kPa, MPa, psi
Pabs, Prel or psig
micron, inHg, Pa,
hPa, mTorr,Torr,
inH2O, mbar
/ /
Change parameters and select units
Confirm units / parameters
Description
Temperature unit
Unit for pressure.
Switch between absolute and relative
pressure display
Unit for vacuum pressure.
Select measuring mode: heat pump / cooling
/ or Auto
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