Testo 550 ошибка eep fail

8.3.

8.4.

1.800.561.8187

Question

—-

is lit up instead of

measurement parameter

display

Display

EEP FAIL

Accessories and spare parts

Description

Clamp probe for temperature measurement

at pipes

Pipe wrap probe with Velcro tape for pipe

diameters of up to max. 75 mm, Tmax.

+75 °C, NTC

Watertight NTC surface probe

Precise, robust NTC air probe

Transport case for measuring instrument,

probe and hoses

For a complete list of all accessories and spare parts, please refer

to the product catalogues and brochures or look up our website at:

www.testo.com

If you have any questions, please contact your dealer or Testo

Customer Service. The contact details can be found on the back of

this document or on the Internet at www.testo.com/service-

contact..

www.

Possible causes/solution

Sensor or cable defective

> Please contact your dealer or

Testo Customer Service

Eeprom defective

> Please contact your dealer or

Testo Customer Service

Article no.

0613 5505

0613 4611

0613 1912

0613 1712

0516 5505

information@itm.com

.com

8 Tips and assistance

19

For a complete list of all accessories and spare parts, please refer 
to the product catalogues and brochures or look up our website at: 
www.testo.de 

 If you have any questions, please contact your dealer or Testo 
Customer Service. The contact details can be found on the back of 
this document or on the Internet at www.testo.com/service-
contact. 

testo 550 · Digital manifold

Instruction manual

1 Contents

3

1 Contents

1 Contents ………………………………………………………………………………………3

2 Safety and the environment…………………………………………………………..4

2.1. About this document………………………………………………………………4

2.2. Ensure safety………………………………………………………………………..5

2.3. Protecting the environment……………………………………………………..5

3 Specifications ………………………………………………………………………………6

3.1. Use ……………………………………………………………………………………..6

3.2. Technical data ………………………………………………………………………6

4 Product description………………………………………………………………………8

4.1. Overview………………………………………………………………………………8

5 First steps ……………………………………………………………………………………9

6 Using the product ……………………………………………………………………….11

6.1. Preparing for measurement …………………………………………………..11

6.1.1. Connecting the temperature sensor………………………………………………………11

6.1.2. Switching the instrument on…………………………………………………………………12

6.1.3. Selecting the measuring mode…………………………………………………………….. 13

6.2. Performing the measurement ………………………………………………..14

7 Maintaining the product ………………………………………………………………16

8 Tips and assistance…………………………………………………………………….18

8.1. Questions and answers ………………………………………………………..18

8.2. Measurement parameters …………………………………………………….18

8.3. Error reports ……………………………………………………………………….19

8.4. Accessories and spare parts …………………………………………………19

2 Safety and the environment

4

2 Safety 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 objects to be measured or the measurement environment

may also pose risks: Note the safety regulations valid in your

area when performing the measurements.

> 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

3 Specifications

3.1. Use

The testo 550 is a digital manifold for maintenance and servicing

work at refrigeration systems and heat pumps. It must only be used

by qualified authorized personnel.

The testo 550 replaces mechanical manifolds, thermometers and

pressure/temperature tables by means of its functions. Pressures

and temperatures can be loaded, adjusted, tested and monitored.

The testo 550 is compatible with most non-corrosive refrigerants,

water and glycol. The testo 550 is not compatible with refrigerants

that contain ammonia.

The product must not be used in areas at risk of explosion!

3.2. Technical data

Characteristic Values

Parameters Pressure: kPa / MPa / bar / psi

Temperature: °C/°F/K

Sensor Pressure: 2 x pressure sensor, temperature:

2 x NTC

Meas. cycle 0.75 s

Measurement

channels

Quantity: 4

Interfaces Pressure connections: 3 x 7/16″ UNF

NTC measurement

Measuring ranges Pressure measuring range HP/LP:

-1 to 50 bar (rel)/-14.7 to 725 psi (rel)/

100 to 5000 kPa (rel)/0.1 to 5 MPa (rel)

Temperature measuring range:

-50 to +150 °C/-58 to 302 °F

Humidity application

range

10 to 90 % RH

Overload 60 bar, 6000 kPa, 6 MPa, 870 psi

Resolution Pressure resolution: 0.01 bar/0.1 psi/

1 kPa/0.001 MPa

Temperature resolution: 0.1 °C/0.1 °F

3 Specifications

7

Characteristic Values

Accuracy (nominal

temperature

22 °C/71.6 °F)

Pressure: ±0.75 % of final value (±1 digit)

Temperature (-40…150°C): ±0.5 K (±1 digit)

No. of refrigerants 40

Selectable

refrigerants

No refrigerant, R12, R22, R123, R134a,

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 (H2O), R744 (only in

permissible measuring range up to 50 bar),

R1234yf (Display: T8)

Measurable media Measurable media: All media that are stored

in the testo 550. Not measurable: Ammonia

(R717) and other refrigerants which contain

ammonia

Ambient conditions Operating temperature: -10 to 50 °C/

14 to 122 °F

Storage temperature: -20 to 60 °C/

-4 to 140 °F

Housing Material: ABS/PA/TPU

Dimensions: 265 x 135 x 75 mm

Weight: approx. 1000 g (without batteries)

Power supply Current source: Rechargeable

batteries/batteries 4x 1.5 V, type

AA/mignon/LR6

Battery life: approx. 150 h (display light off)

Display Type: Illuminated LCD

Updating of readings: 1 s

Response time: 0.5 s

Directives,

standards and tests

EC Directive: 2004/108/EC

Warranty Duration: 2 years

Warranty conditions: see website

www.testo.com/warranty

4 Product description

8

4 Product description

4.1. Overview

Display and control elements

1Mini-DIN probe socket for NTC temperature probe, with socket

cover

2 Foldable suspension device (on rear)

3Display. Instrument status icons:

Icon Significance

Battery capacity: >75 %/>50 %/>25 %/<10 %

/ / Select measuring mode (see)

4Battery compartment. It is not possible to charge rechargeable

batteries in the instrument!

5 First steps

9

5Control keys:

Key Function

[Set] Set units

[R, Start/ Stop] Select refrigerant/ Start/stop / Tightness

test

[Mode] Switching measuring mode

[Min/Max/Mean] Display min./max./mean values

[▲] Up key: Change display view

[p=0] Pressure zeroing

Light key: Switch display light on/off

[▼] Down key: Change display view

[ ] Switching the instrument on/off

6Sight glass for refrigerant flow

72 x valve positioner

83 x hose parkers for refrigerant hoses

93 x connections 7/16″ UNF, brass

Left/right: Low pressure/high pressure, for refrigerant hoses with

quick connect fitting, passage can be locked via valve

positioner. Centre: for refrigerant bottles, for example, with

sealing cap.

5 First steps

Inserting batteries/rechargeable batteries

1.Fold out the suspension device and open the battery

compartment (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.

When not in use for long period: Remove

batteries/rechargeable batteries.

Completely charge rechargeable batteries before using the

instrument.

5 First steps

10

Switching the instrument on

> Press [].

— Initialization phase:

• All display segments are lit (length of time: 2 s).

— Measurement view is opened.

Performing settings

1.Press [Set].

— The configuration menu is opened and the adjustable

parameter flashes.

2.Set parameters:

Key functions

Representation Explanation

[▲] or [▼] Change parameter, select unit

[Set] Select units/parameters

Adjustable parameters

Representation Explanation

°C, °F Set temperature unit.

bar, kPa, MPa, psi Set unit of pressure.

Pabs, Prel or psia,

psig

Depending on the selected unit of pressure:

Switch between absolute and relative

pressure display.

29.92 inHg/

1.013 bar

Set current absolute pressure (see table)

/ / Select measuring mode (see Selecting the

measuring mode, page 13)

 Settings will be applied following the final selection.

Operating valve positioner

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 anticlockwise.

> Close valve: Turn valve positioner clockwise.

6 Using the product

11

WARNING

Only tighten valve positioner with your hand! Do not use any tools

when tightening as otherwise the thread may be damaged.

6 Using the product

6.1. Preparing for measurement

6.1.1. Connecting the temperature sensor

Sensors must be connected before the measuring

instrument is switched on, so that they are recognised by

the instrument.

Surface temperature sensor

An NTC temperature sensor (accessory) must be connected for

measuring the pipe temperature and 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 reduce the measuring errors in the main field of

applications. This reduces measuring errors when using surface

temperature sensors.

If the measuring instrument testo 550 is used in combination with

insertion or air temperature sensors (accessories), this factor must

be deactivated:

> Press and hold the keys SET + MODE together and switch on

the measuring instrument [].

— The instrument shows the message Fact off.

The surface compensation factor becomes active every

time the measuring instrument is switched on.

6 Using the product

12

6.1.2. Switching the instrument on

> Press [ ].

Zeroing the pressure sensors

Zero the pressure sensors before every measurement.

✓ All connections must be pressureless (ambient pressure).

> Press key [P=0] and execute zeroing.

Connecting the refrigerant hoses

Before each measurement check whether the refrigerant

hoses are in flawless condition.

✓ The valve actuators are closed.

1.Connect the refrigerant hoses for low-pressure side (blue) and

high-pressure side (red) to the measuring instrument.

2.Connect the refrigerant hoses to the system.

WARNING

The measuring instrument dropping down or any other comparable

mechanical load can cause breakage of the pipe pieces in the

refrigerant hoses. The valve actuators may also suffer damage,

which in turn could result in further damage inside the measuring

instrument, which may not be detectable from outside.

> For your own safety you should return the measuring

instrument to the Testo Service for technical inspection.

> You should therefore always replace the refrigerant hoses with

new ones after the measuring instrument has dropped down or

after any comparable mechanical loading.

Setting the refrigerant

1.Press [R, Start/Stop].

— This opens the refrigerant menu and the currently selected

refrigerant flashes.

2.Setting the refrigerant:

6 Using the product

13

Key functions

Representation Explanation

[▲] or [▼] Changing the refrigerant

[R, Start/Stop] Confirm the setting and exit the refrigerant

menu.

Available refrigerants

Representation Explanation

R… Refrigerant number of refrigerant acc. to

ISO 817

T… Special Testo designation for certain

refrigerants (T8 = T1234yf)

— no refrigerant selected.

Example: Setting refrigerant R401B

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

2.Press [R, Start/Stop] to confirm the setting.

Quitting the refrigerant selection

> Press [R, Start/Stop] or automatically after 30 s, if no other key

has been pressed.

6.1.3. Selecting the measuring mode

1.Press[Set] several times.

2.Select function with[▲] or [▼].

3.Save setting: press [Set].

— Measuring mode is dsplayed.

Display Mode Function

Refrigeration

system

Normal functionality of the digital manifold

Heat pump Normal functionality of the digital manifold

Automatic

mode

If the automatic mode is activated, the

testo 550 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 higher than the pressure on

the high-pressure side. During the

change, Load (2 s) is shown in the

6 Using the product

14

Display Mode Function

display.

This mode is especially suited to air

conditioning systems which cool and

heat.

6.2. 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 suspension device 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).

> Maintain permissible measuring range (0 to 50 bar). Pay

particular attention with systems with refrigerant R744, as

these are often operated with higher pressures.

Measuring

✓ The steps described in the chapter «Preparing for

measurement» have been completed.

1.Pressurize the measuring instrument.

2.Read off readings.

With zeotropic refrigerants, the evaporation temperature

to/Ev is displayed after the complete evaporation/the

condensation temperature tc/Co is displayed after the

complete condensation.

The measured temperature must be assigned to the

superheating or the subcooling side (toh <—> tcu).

Depending on this assignment, toh/T1 or Δtoh/SH or

tcu/T2 or Δtcu/SC is shown depending on the selected

display.

6 Using the product

15

— Reading and display illumination flash:

• 1 bar before reaching the critical pressure of the refrigerant,

• upon exceeding the max. permissible pressure of 50 bar.

Key functions

> [▲] or [▼]: Change the reading display.

Possible display combinations:

Evaporation pressure

Refrigerant evaporation

temperature to/Ev

Condensation pressure

Refrigerant condensation

temperature tc/Co

or (only with connected temperature probe)

Evaporation pressure

Measured temperature toh/T1

Condensation pressure

Measured temperature tcu/T2

or (only with connected temperature probe)

Evaporation pressure

Superheating Δtoh/SH.

Condensation pressure

Subcooling Δtcu/SC

With two connected NTC probes, Δt is also shown.

> [Mean/Min/Max]: Record readings, display min./max. readings,

mean values (since switching on).

Tightness test/pressure drop test

Systems can be tested for tightness with the

temperature-compensated tightness test. The system

pressure and the ambient temperature are measured

over a defined period for this. A temperature probe can

be connected that measures the ambient temperature

for this (recommendation: NTC air probe, art. no. 0613

1712). Information about the temperature-compensated

differential pressure and about the temperature at the

beginning/end of the test exists as a result. If no

temperature probe is connected, the tightness test can

be performed without temperature compensation.

✓ The steps described in the chapter «Preparing for

measurement» have been completed.

1.Press [Mode] (leakage test view).

— Leakage test view is opened. ΔP is displayed.

2.Start the leakage test: Press [R, Start/Stop].

3.End the leakage test: Press [R, Start/Stop].

7 Maintaining the product

16

— Result is displayed.

4. Confirm message: Press [Mode].

— You automatically jump to the evacuation/vacuum display

menu.

Evacuation/vacuum display

The measurement is performed on the low-pressure

side.

5. Press [Mode].

— Result is displayed on the low-pressure side.

6. Press [Mode].

— The measuring mode is displayed.

7 Maintaining the product

Cleaning the instrument

> If the housing of the instrument is dirty, clean it with a damp

cloth.

Do not use any aggressive cleaning agents or solvents! Weak

household cleaning agents and soap suds may be used.

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.

Ensuring the measuring accuracy

Testo Customer Service would be glad to further assist you if you

so wish.

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

Keep to the permissible pressure range!

> Calibrate instrument regularly (recommended: annually).

7 Maintaining the product

17

Changing batteries/rechargeable batteries

✓ Instrument is switched off.

1.Fold out the suspension device, loosen the clip and remove the

cover of the battery compartment.

2.Remove empty 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.

Changing the valve or valve positioner handle

WARNING

Change of the valve positioners and valves by the customer is not

permissible.

> Send the measuring instrument to the Testo Customer Service.

8 Tips and assistance

18

8 Tips and assistance

8.1. Questions and answers

Question Possible causes/solution

flashes Batteries are almost empty.

> Change batteries.

The instrument switches

off automatically.

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

Δtoh SH Superheating, evaporation pressure

Δtcu 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

19

8.3. Error reports

Question Possible causes/solution

—- is lit up instead of

measurement parameter

display

Sensor or cable defective

> Please contact your dealer or

Testo Customer Service

Display EEP FAIL Eeprom defective

> Please contact your dealer or

Testo Customer Service

8.4. Accessories and spare parts

Description Article no.

Clamp probe for temperature measurement

at pipes

0613 5505

Pipe wrap probe with Velcro tape for pipe

diameters of up to max. 75 mm, Tmax.

+75 °C, NTC

0613 4611

Watertight NTC surface probe 0613 1912

Precise, robust NTC air probe 0613 1712

Transport case for measuring instrument,

probe and hoses

0516 5505

For a complete list of all accessories and spare parts, please refer

to the product catalogues and brochures or look up our website at:

www.testo.com

If you have any questions, please contact your dealer or Testo

Customer Service. The contact details can be found on the back of

this document or on the Internet at www.testo.com/service-

contact..

FCC statements:

This device complies with part 15 of the FCC rules. Operation is subject to the

following two conditions: (1) this device may not cause harmful interference, and (2)

this device must accept any interference received, including interference that may

cause undesired operation.

NOTE: The manufacturer is not responsible for any radio or TV interference caused

by unauthorized modifications or changes to this equipment. Such modifications or

changes could void the user’s authority to operate the equipment.

NOTE: This equipment has been tested and found to comply with the limits for a

Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed

to provide reasonable protection against harmful interference in a residential

installation. This equipment generates uses and can radiate radio frequency energy

and, if not installed and used in accordance with the instructions, may cause harmful

interference to radio communications. However, there is no guarantee that

interference will not occur in a particular installation. If this equipment does cause

harmful interference to radio or television reception, which can be determined by

turning the equipment off and on, the user is encouraged to try to correct the

interference by one or more of the following measures:

‐ Reorient or relocate the receiving antenna.

‐ Increase the separation between the equipment and receiver.

‐Connect the equipment into an outlet on a circuit different from that to which the

receiver is connected.

‐Consult the dealer or an experienced radio/TV technician for help.

Power is so low that no RF exposure calculation is needed.