TESTO 557 User manual
testo 557 · Digital manifold
Instruction manual
2
1 Contents
3
1Contents
1Contents...................................................................................................3
2Safety and the environment....................................................................4
2.1. About this document........................................................................4
2.2. Ensure safety...................................................................................5
2.3. Protecting the environment..............................................................5
3Specifications ..........................................................................................6
3.1. Use..................................................................................................6
3.2. Technical data.................................................................................6
4Product description.................................................................................9
4.1. Overview..........................................................................................9
5First steps ..............................................................................................11
6Using the product..................................................................................13
6.1. Preparing for measurement...........................................................13
6.1.1. Connecting the temperature sensor...............................................................13
6.1.2. Switching the instrument on...........................................................................13
6.1.3. Choosing the measuring mode......................................................................15
6.2. Performing the measurement........................................................16
7Maintaining the product........................................................................19
8Tips and assistance...............................................................................21
8.1. Questions and answers.................................................................21
8.2. Measurement parameters .............................................................21
8.3. Error reports ..................................................................................22
8.4. Accessories and spare parts .........................................................22
2 Safety and the environment
4
2Safety and the environment
2.1. About this document
Use
> Please read this documentation through 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 products.
> Keep this document to hand so that you can refer to it when
necessary.
> Hand this documentation on to any subsequent users of 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
measures.
Note: Basic or further information.
1. ...
2. ... Action: more steps, the sequence must be
followed.
> ... Action: a step or an optional step.
- ... Result of an action.
Menu Elements of the instrument, the instrument
display or the program interface.
[OK] Control keys of the instrument or buttons of
the program interface.
... | ... Functions/paths within a menu.
“...” Example entries
2 Safety and the environment
5
2.2. Ensure safety
> Do not operate the instrument if there are signs of damage at
the housing, mains unit or feed lines.
> Do not perform contact measurements on non-insulated, live
parts.
> 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. Follow the
prescribed steps exactly. Use only original spare parts from
Testo.
> The testo 330 must be checked before commissioning for any
visible damage. Do not commission the testo 330 if there are
signs of damage on the housing, mains unit or supply lines.
Electrical risk.
> If the measuring instrument falls or another comparable
mechanical load occurs, the pipe sections of the refrigerant
hoses may break. The valve positioners may also be damaged,
whereby further damage to the interior of the measuring
instrument may occur that cannot be identified from the outside.
The refrigerant hoses must therefore be replaced with new,
undamaged refrigerant hoses every time the measuring
instrument falls or following any other comparable mechanical
load. Send the measuring instrument to Testo Customer
Service for a technical check for your own safety.
> Electrostatic charging can destroy the device. Integrate all the
components (system, manifold's valve block, refrigerant bottle
etc.) into the potential equalisation (earthing). Please see the
safety instructions for the system and the refrigerant used.
2.3. Protecting the environment
> Dispose of faulty rechargeable batteries/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
applicable environmental regulations.
3 Specifications
6
3Specifications
3.1. Use
The testo 557 is a digital manifold for maintenance and service
work on refrigeration systems and heat pumps. The device is only
to be used by qualified expert personnel.
With its functions the testo 557 replaces mechanical manifolds,
thermometers and pressure/temperature charts. Pressures and
temperatures can be applied, adapted, tested and monitored.
The testo 557 is compatible with most of the non-corrosive
refrigerants, water and glycol. The testo 557 is not compatible with
ammoniac refrigerants.
Then product must not be used in explosive environments!
3.2. Technical data
Feature Values
Measurement
parameters Pressure: psi/ kPa/MPa/bar
Temperature: °F/°C/K
Vacuum: Micron / inHg / inH2O / hPa / mbar/
Torr / Pa
Sensing element Pressure: 2 x pressure sensors
Temperature: 2 x NTC
Measuring cycle 0.75 s
Interfaces Pressure connections: 3 x 7/16" UNF,
1x 5/8" UNF
NTC measurement
Measurement
ranges Pressure measurement range
HP/LP: -14.7…725 psi / -100…5000 kPa
/ -0.1…5 MPa / -1…50 bar (rel)
Temperature measurement
range: -58…302 °F / -50…+150 °C
Measurement range vacuum
(rel): -14.7…0 psi / -1…0 bar
Overload 754 psi, 52 bar, 5200 kPa, 5.2 MPa
3 Specifications
7
Feature Values
Resolution Resolution pressure: 0.1 psi / 0.01 bar /
1 kPa / 0.001 MPa
Resolution temperature: 0.1 °F / 0.1 °C /
0.1 K
Vacuum resolution: 500 Micron / 0.02 inHg /
0.5 inH2O / 1 hPa / 1 mbar / 0.5 Torr / 100 Pa
Accuracy (nominal
temperature 71.6 °F
/ 22 °C)
Pressure: ±0.5% of final value (±1 digit)
Temperature (-40…302 °F/-40…+150 °C):
±0.9 F (±1 digit), ±0.5K (±1 digit), ±0.5 °C
(±1 digit)
Vacuum: 1% of final value (±1 digit)
No. of refrigerants 40
Selectable
refrigerants No refrigerant, R12, R22, R123, R134a,
R227, R290, R401A, R401B, R402A, R402B,
R404A, R406A, R407A, R407C, R408A,
R409A, R410A, R411A, R413A, R414B,
R416A, R417A, R420A, R421A, R421B,
R422A, R422B, R422D, R424A, R427A,
R434A, R437A, R438A, R502, R503, R507,
R600, R600a, R718, R744 (only in
permissible measurement range up to
50 bar), R1234yf (Display: T8)
Measurable media Measurable media: all media that is stored in
the testo 557. Not measurable: ammonia
(R717) and other refrigerants which contain
ammonia
Ambient conditions Operating temperature: -4…122 °F
/ -20…50 °C
Storage temperature: -4…140 °F / -20…60 °C
Humidity in area of use: 10… 90 %rF
3 Specifications
8
Feature Values
Housing Material: ABS / PA / TPE
Dimensions approx. 280 x 135 x 75 mm
Weight: approx. 1200 g (without batteries)
IP-class 42 (position in use hanging down)
Power supply Current source: Rechargeable batteries /
batteries 4 x 1.5V type AA / Mignon / LR6
Battery lifetime: approx. 150 h (display
illumination off)
Display Type: Illuminated LCD
Response time: 0.5 s
Directives,
standards and tests EC Directive: 2004/108/EC
Warranty Duration: 2 years
Terms of warranty: see website
www.testo.com/warranty
4 Product description
9
4Product description
4.1. Overview
Display and control elements
1Sensor socket Mini-DIN for NTC-temperature sensor, with
socket cover
2Suspension attachment, foldable (backside).
3Display. Instrument status icons:
Icon Meaning
Battery capacity: >75% / >50% / >25% / <10%
// Select measuring mode, see Choosing the
measuring mode page 15
4Battery compartment. The rechargeable batteries cannot be
charged inside the instrument!
4 Product description
10
5 Control keys:
Key Function
[Set] Set units
[R, Start/Stop] Select refrigerant / Start-Stop leak test
[Mode] Switch between measuring modes
[Min/Max/Mean] Show min, max, mean values
[▲] Up-key: Change display view.
[p=0] Pressure zeroing
Light key: switches display light on/off.
[▼] Down-key: changes display view.
[] Switch the instrument on/off
6Inspection glass for refrigerant flow.
74 x valve actuators
84 x hose brackets for refrigerant hoses
9Connection 7/16" UNF, brass.
High pressure, for refrigerant hoses with quick release screw
fitting, passage for valve actuator lockable.
10 Connection 5/8" UNF, brass, for vacuum pump
11 Connection 7/16" UNF, brass, for e.g. refrigerant cylinders, with
screw cap.
12 Connection 7/16" UNF, brass.
Low pressure for refrigerant hoses with quick release screw
fitting, passage for valve actuator lockable.
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