Testo Instruments 557 User 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 ................................................................................................ 7

5 Using the manifold .................................................................................. 9

5.1. Preparing for measurement ............................................................. 9

5.1.1. Switching the instrument on ............................................................................. 9

5.1.2. Connecting the temperature sensor ............................................................... 11

5.1.3. Connecting the vacuum probe ....................................................................... 11

5.1.4. Switching Bluetooth® on and off .................................................................... 11

5.1.5. Measuring mode ............................................................................................ 12

5.2. Performing the measurement ........................................................ 13

6 Technical data ........................................................................................ 16

6.1.1. Bluetooth Modul ............................................................................................. 16

6.1.2. General technical data ................................................................................... 17

7 Maintaining the product ........................................................................ 19

8 Tips 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

9 EC declaration of conformity ................................................................ 23

3

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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

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

6

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4 First steps

5 Battery compartment. The rechargeable batteries cannot be

charged inside the instrument!

6 Control keys:

Key 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.

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.

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4 First steps

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

Change parameters and select units

Confirm units / parameters

Description

parameters

°C, °F

bar, kPa, MPa, psi

Temperature unit

Unit for pressure.

Pabs, Prel or psig Switch between absolute and relative

pressure display

micron, inHg, Pa,

Unit for vacuum pressure.

hPa, mTorr,Torr,
inH2O, mbar

/ /

AUTO OFF

Select measuring mode: heat pump / cooling
/ or Auto

Activate or deactivate Automatic power-off.
Instrument switches off after 30 minutes if no

temperature probe is connected and there is
no pressure apart from ambient pressure

T

Activate or deactivate surface temperature

fac

compensation factor, icon is shown on the
display if the function is deactivated

- Settings will be applied following the final selection.

Operating the valve stem shutoffs

The digital manifold acts like a conventional two-way manifold with
regard to the refrigerant path: The passages are opened by
opening the valves. The adjacent pressure is measured with valves
closed as well as with them open.

> Open valve: Turn valve positioner counterclockwise.
> Close valve: Turn valve positioner clockwise.

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WARNING

Over tightening the valve stem shutoffs may cause:

• Damage to the PTFE seal.

• Mechanical deformation of the valve piston leading to the
PTFE seal falling out.

• Damage to the thread of the threaded spindle and the valve
screw.

• valve knobs to brake.

Lightly tighten the valve knob. Do not use tools to tighten the valve

5 Using the manifold

stem shutoffs.

5.1. Preparing for measurement

5.1.1. Switching the instrument on

> Press [/].

Zero the pressure sensors before every measurement.

✓ All connections must be at ambient pressure.

5 Using the manifold

> Press [P=0] key for 3 seconds to execute zeroing.

Connecting the refrigerant hoses

Before each measurement check whether the refrigerant
hoses are in flawless condition.

✓ Make sure the valve stem shutoffs are closed.

1. Connect the refrigerant hoses to the low-pressure side (blue)
and high-pressure side (red).

2. Connect the refrigerant hoses to the AC/R system.

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5 Using the manifold

Dropping this instrument or any other comparable mechanical
shock can damage the refrigerant pipes and hoses. The valve
actuators may also suffer damage, which in turn could result in
further damage inside the instrument and may not be detectable
from outside.

> For your own safety you should return the manifold to the

> You should therefore always replace the refrigerant hoses with

Choosing the refrigerant

1. Press [R, ►, ■].

- It activates the refrigerant menu and the currently selected

2. Setting the refrigerant:

Key functions Description

[▲] or [▼]

[R, ►, ■] Confirm the selection and exit the refrigerant

WARNING

Testo Service Department for technical inspection.

new ones after an accidental drop has occurred or after any
visible wear and tear.

refrigerant flashes.

Selectng another refrigerant

menu

10

Available refrigerants

Representation Description

R... Refrigerant number of refrigerant acc. to

ISO 817

---

no refrigerant selected.

Example: Setting refrigerant R401B

1. Press [R, ►, ■] to activate refrigerant menu.

2. Press [▲] or [▼] several times, until R401B flashes.

3. Press [R, ►, ■] to confirm the setting.

Exiting the refrigerant selection

> Press [R, ►, ■] or automatically after 30 s, if no other key has

been pressed.

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5.1.2. Connecting the temperature sensor

Surface temperature sensor

At least one NTC temperature probe must be connected to
measure the pipe temperature, for automatic calculation of
superheating and subcooling.

Deactivating the surface compensation factor for insertion and
air temperature sensor

A surface compensation factor has been set in the measuring
instrument to improve the measuring accuracy of surface
temperature readings.

If the manifold is used in combination with insertion or air
temperature probe (optional), this factor must be deactivated:

to Off.

fac

fac

is displayed.

1. Press [Set] repeatedly until T

2. Press [▲] or [▼] to set T

3. Press [Set] to continue through the settings menu until the
measurement/home view is displayed.

- T

is shown on the display if T

fac

is disabled.

fac

5.1.3. Connecting the vacuum probe

> Open the front cover of the connector and connect up the

vacuum probe.

5 Using the manifold

5.1.4. Switching Bluetooth® on and off

In order to to establish a connection via Bluetooth, on an Android
or iOS device, the Testo App Refrigeration must be already
installed.

You can get the App for iOS instruments in the App Store or for
Android instruments in the Play Store.

Information about compatibility can be found in the relevant app
store.

1. To turn on the Bluetooth press [▲] and [▼] simultaneously and
hold down for 3 seconds.

- Once the Bluetooth icon is shown on the display, Bluetooth is
switched on.

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5 Using the manifold

Display Description

flashes

is permanently

displayed

is not displayed

2. To turn off the Bluetooth press [▲] and [▼] simultaneously and

hold down for 3 seconds.

- Once the Bluetooth icon is no longer shown on the display,

Bluetooth is switched off.

5.1.5. Measuring mode

Display Mode Function

Refrigeration
system

Heat pump Normal function of the digital manifold

Automatic
mode

There is no Bluetooth connection, or a
potential connection is being searched for.

There is a Bluetooth connection.

Bluetooth is disabled.

Normal function of the digital manifold

If the automatic mode is activated, the
testo 557 digital manifold automatically
changes the display of the high and low
pressure. This automatic change occurs
when the pressure on the low-pressure
side is 1 bar (15 psi) higher than the
pressure on the high-pressure side.
During the change, Load (2 s) is shown
in the display.

This mode is especially suited to air
conditioning systems which cool and
heat (heat pumps).

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5 Using the manifold

5.2. Performing the measurement

WARNING

Risk of injury caused by refrigerant that is at high pressure,

hot, cold, or poisonous!

> Wear safety goggles and protective gloves..
> Before pressurizing the measuring instrument: Always fasten

the measuring instrument at the hanging hook in order to
prevent it from falling (risk of breakage)

> Check if the refrigerant hoses are intact and connected

correctly before each measurement. Do not use a tool to
connect the hoses. Only tighten the hoses by hand (max.
torque 5.0 Nm/3.7 ft*lb).

> Do not exceed the permissible measuring range (0 to 870 psi /

0 to 60 bar). Pay particular attention with systems with
refrigerant R744, as these are often operated with higher
pressures.

Measuring

1. Connect and apply pressure to the manifold.

2. See readings.

Note: With refrigerants that have a temperature glide, “Zeotropes”
the evaporation temperature Ev/to and condensation temperature
Co/tc are displayed after evaporation and condensation are
complete.

Zeotropes (refrigerants blends mix together) can separate from
each other, unlike azeotropes which mix together to become one.
Zeoptropes often blend refrigerants with different boiling points
(saturation temps), where one will change from liquid to vapor
before the other as they go through the evaporator. The glide is
the difference between the lowest boiling point and the highest
boiling point. If they are 3 degrees apart, for example, the blend
has a 3 degree glide..

The display illumination will flash if:

• The critical pressure of the refrigerant is within 15 psi (1 bar)

of the highest pressure (and temperature) where the
refrigerant can still condense.

• The maximum. permissible pressure of 870 psi (60 bar) is
exceeded.

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5 Using the manifold

Key functions

> Press [▲]
Possible display combinations:

Refrigerant evaporation
temperature Ev/to (°F/°C)
Evaporation pressure
(psi/bar)

Measured temperature T1/t

(°F/°C)

Evaporation pressure
(psi/bar)

Superheating SH/∆t
Evaporation pressure
(psi/bar)

Changeable

- Evaporation
Temperature (Ev)

- Measured
Temperature (T1)

- Superheating

(SH)

or [▼] to change the reading in the display.

Refrigerant condensation
temperature Co/tc (°F/°C)
Condensation pressure
(psi/bar)

oh

Measured temperature T2/t

(°F/°C)

Condensation pressure
(psi/bar)

oh

(°F/°C)

Subcooling SC/∆t

cu

(°F/°C)

Condensation pressure
(psi/bar)

Changeable

- Condensation
Temperature (Co)

- Measured
Temperature (T2)

- Subcooling (SC)

cu

14

Evaporation
pressure

Condensation
pressure

With both NTC temperature probes connected, ∆t is also shown.
> Press [Mean/Min/Max]: to display min. / max. readings and

mean values.

Leak test / pressure drop test

Systems can be tested for tightness with the temperature­compensated leak test. The system pressure and the ambient
temperature are measured over a defined period of time, typically
with an inert gas such as Nitrogen. A temperature probe can be
connected that measures the ambient temperature. : Optional air
temperature probe, part. no. 0613 1712) is recommended.

Measurement data of the temperature-compensated differential
pressure and temperature, from start to the end of the test, is
displayed. It is possible to perform a leak test without connecting a
temperature probe.

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5 Using the manifold

A

1. Press [Mode] ∆P is displayed.

2. Start the leak test: Press [R, ►, ■]. ∆P is now flashing and

hh:mm timer is on.

3. End the leak test: Press [R, ►, ■]. ∆P stops flashing and

hh:mm timer stops.

- Result is displayed. Note: Leak test time duration and ∆P value

4. Confirm the message: Press [Mode] to exit leak mode.

Differential
Duration
of test

pressure start

compared to

actual

Measured
pressure
beginning
of test

ctual
measured
pressure

Vacuum measurement

✓ The vacuum probe is plugged into the front connection of the

manifold and connected to the system.

1. Press [Mode] the vacuum mode is displayed.
If ambient pressure is applied to the vacuum probe, then oooo is

shown on the display.

2. Start the vacuum pump.

- Once the measuring range 0 to 20,000 microns 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.

3. To leave vacuum mode, remove the vacuum probe from the
testo 557 or switch to the standard measurement view using the

[Mode] button.

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6 Technical data

6 Technical data

6.1.1. Bluetooth Modul

The Bluetooth® option may only be operated in countries in

which it is type approved.

Feature Values

Bluetooth Range >20 m (free field)

Bluetooth type

LSD Science & Technology Co., Ltd

L Series BLE Module (08 Mai 2013) based
on TI CC254X chip

Qualified Design ID B016552

Bluetooth radio

Class 3

class

Bluetooth company 10274

European Union

Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,
United Kingdom.

EFTA countries

Island, Suisse, Norway, Lichtenstein.

Other countries

USA, Turkey, Hong Kong, Canada

Information from the FCC (Federal Communications Commission)
This device complies with part 15 of the FCC Rules. Its

commissioning is subject to the two following conditions: (1) This
instrument must not cause any harmful interference and (2) this
instrument must be able to cope with interference, even if this has
undesirable effects on operation.

Changes
The FCC demands that the user be informed that any changes or

modifications to the instrument that are not explicitly approved by
Testo AG may void the user's right to use this instrument.

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6.1.2. General technical data

Feature Values

Pressure: psi / kPa / MPa / bar

Parameters

Sensors

Measuring cycle 0.5 s

Interfaces

Measuring
ranges

Overload 940 psi, 65 bar, 6500 kPa, 6.5 MPa

Resolution

Accuracy
(nominal
temperature

71.6 °F / 22 °C)

No. of
refrigerants

Temperature: °F / °C / K
Vacuum: micron / inHg / inH

mTorr /Torr / Pa

2 Pressure: sensors, 2 Temperature (NTC
Thermistors)

Pressure connections: 3 x 1/4" SAE, 1x 3/8" SAE
NTC measurement
External vacuum probe

Pressure measurement range
HP/LP: -14.7…870 psi / -100…6000 kPa
/ -0.1…6 MPa / -1…60 bar (rel)

Temperature measurement range: -58…302 °F
/ -50…+150 °C

Measurement range vacuum (abs):
0 … 20.000 micron

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:

1 micron (from 0 to 1000 micron)
10 micron (from 1000 to 2000 micron)
100 micron (from 2000 to 5000 micron)
500 micron (from 5000 to 10000 micron)
5000 micron (from 10000 to 20.000 micron)

Pressure: ±0.5% FS (±1 digit)
Temperature: -58 to 302°F (0.9°F ± 1 digit) / -50

to 150°C (±0.5 °C ±1 digit)
Vacuum: ±10% of rdg +10 microns (100 to 1.000

microns)

60

6 Technical data

O / hPa / mbar /

2

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6 Technical data

Feature Values

No refrigerant, R11, R12, R22, R123, R1234ze,
R125, R13B1, R134a, R14, R142B, R152a,
R161, R23, R227, R290, R32, R401A, R401B,
R401C, R402A, R402B, R404A, R406A, R407A,

R407B, R407C, R407D, R407F, R408A, R409A,
Selectable
refrigerants

Measurable
media

Ambient
conditions

Bluetooth Range >20 m / 65 ft (unobstructed field)

Housing

IP-class 42

Power supply

Display

Directives,
standards and
tests

Warranty

R410A, R411A, R412A, R413A, R414B, R416A,

R417A, R420A, R421A, R421B, R422A, R422B,

R422C, R422D, R424A, R426A, R427A, R434A,

R437A, R438A, R502, R503, R507, R508A,

R508B, R600, R600a, R718 (H2O), R744 (CO2)

(only in permissible measurement range up to

60 bar), R1234yf

All refrigerants that are stored in the testo 557

Ammonia (R717) and other refrigerants which

contain ammonia will damage the manifold

Operating temperature: -4…122°F / -20…50°C

14…122°F / -10…50°C (vacuum probe)

Storage temperature: -4…140°F / -20…60°C

Humidity in area of use: 10… 90%rF

Material: ABS / PA / TPE

Dimensions approx. 280 x 135 x 75 mm

Weight: approx. 1200 g (without batteries)

4 x 1.5 V, type AA/mignon/LR6 rechargeable or

standard batteries

Battery life: approx. 250h

(display light off, Bluetooth off, vacuum probe not

connected)

Type: Illuminated LCD

Response time: 0.5 s

EC Directive: 2014/30/EC

Duration: 2 years

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7 Maintaining the product

Cleaning the instrument

Do not use harsh cleaning agents or solvents! Mild soap and
water may be used.

> Clean instrument using a damp cloth.

Keeping connections clean

> Keep screw connections clean and free of grease and other

deposits, clean with a moist cloth as required.

Removing oil residues

> Carefully blow out oil residues in valve block using compressed

air.

To ensure measuring accuracy

> Check instrument regularly for leaks (recommended: annually).

Keep to the permissible pressure range!

> Calibrate instrument regularly (recommended: annually).

Changing batteries/rechargeable batteries

✓ Instrument is switched off.

7 Maintaining the product

1. Fold out the hook, loosen the clip and remove the cover of the
battery compartment.

2. Remove discharged batteries/rechargeable batteries and insert
new batteries/rechargeable batteries (4x 1.5 V, type AA,
Mignon, LR6) in the battery compartment. Observe the polarity!

3. Set on and close cover of the battery compartment (clip must
engage).

4. Switch the instrument on.

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7 Maintaining the product

Changing the valve or valve stem shutoff

Replacement of valve stem shutoffs or valves must be performed
by a qualified technician. Warranty coverage with respect to valve
stem shut-offs and valves will NOT apply to miss-use or damage
and is only applicable if failure is attributable to defective parts and
workmanship.

Send the measuring instrument to Testo Customer Service.

Cleaning the vacuum probe

Contaminants such as oil may impair the accuracy of the vacuum
sensor.

CAUTION

Carrying out cleaning with the probe connected may result in
damage to the probe!

> Remove the vacuum probe from the testo 557!

CAUTION

Damage to the sensor due to sharp objects!

> Do not insert any sharp objects into the probe!

1. Remove the vacuum probe from the testo 557.

2. Put a few drops of rubbing alcohol into the sensor opening.

3. Seal the opening by placing your finger on it and shake the

vacuum probe briefly.

4. Remove all the alcohol from the probe.

5. Repeat this process at least twice.

6. Leave the probe to dry for at least 1 hour. To dry the sensor

faster, you can connect the probe directly to a vacuum pump
and draw vacuum.

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8 Tips and assistance

8.1. Questions and answers

Question Possible causes/solution

flashes

The instrument switches
off automatically.

Batteries are almost empty.
> Change batteries.

Residual capacity of the batteries is too
low.

> Change batteries.

uuuu lights up instead of

the parameter display

The permissible measuring range has
been undershot.

> Keep to the permitted measuring

range.

oooo lights up instead of

the parameter display

The permissible measuring range has
been exceeded.

> Keep to the permitted measuring

range.

8.2. Measurement parameters

Name Description

bar, °C psi, °F

∆toh SH Superheating, evaporation pressure

∆tcu SC Subcooling, condensation pressure

to Ev Refrigerant evaporation temperature

tc Co Refrigerant condensation temperature

toh T1 Measured temperature, evaporation

tcu T2 Measured temperature, condensation

8 Tips and assistance

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21

8 Tips and assistance

8.3. Error reports

Question Possible causes/solution

---- is lit up instead of

measurement parameter
display

Display EEP FAIL

Display BT ERR No BT module connected or BT

Display ERR 1-5

8.4. Accessories and spare parts

Description Article no.

Clamp probe for temperature measurement
at pipes (1,5m)

Clamp probe for temperature measurement
at pipes (5m)

Pipe wrap probe with Velcro tape for pipe
diameters of up to max. 75 mm, Tmax.
+75 °C, NTC

Watertight NTC surface probe 0613 1912

Precise, robust NTC air probe 0613 1712

External vacuum probe 0638 1557

Sensor or cable defective
> Please contact your dealer or

Testo Customer Service

Eeprom defective
> Please contact your dealer or

Testo Customer Service

module defective.
> Please contact your dealer or Testo

Customer Service

Vac-Probe defect
> Please contact your dealer or

Testo Customer Service

0613 5505

0613 5506

0613 4611

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9 EC declaration of conformity

9 EC declaration of conformity

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