testo 550 · 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...................................................................................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
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2 Safety and the environment
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
[OK]
... | ...
Elements of the instrument, the instrument display or the program interface.
Control keys of the instrument or buttons of the program interface.
Functions/paths within a menu.
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2 Safety and the environment
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.
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3 Specifications
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
Parameters
Sensor
Values
Pressure: kPa / MPa / bar / psi
Temperature: °C/°F/K
Pressure: 2 x pressure sensor, temperature:
2 x NTC
Meas. cycle
Measurement channels
Interfaces
0.75 s
Quantity: 4
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
Resolution
60 bar, 6000 kPa, 6 MPa, 870 psi
Pressure resolution: 0.01 bar/0.1 psi/
1 kPa/0.001 MPa
Temperature resolution: 0.1 °C/0.1 °F
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3 Specifications
Characteristic
Accuracy (nominal temperature
22 °C/71.6 °F)
Values
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
Power supply
Display
Directives, standards and tests
Dimensions: 265 x 135 x 75 mm
Weight: approx. 1000 g (without batteries)
Current source: Rechargeable batteries/batteries 4x 1.5 V, type
AA/mignon/LR6
Battery life: approx. 150 h (display light off)
Type: Illuminated LCD
Updating of readings: 1 s
Response time: 0.5 s
EC Directive: 2004/108/EC
Warranty conditions: see website www.testo.com/warranty
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4 Product description
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!
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5
5 First steps
[
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
[▲]
[p=0]
Up key: Change display view
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.
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.
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5 First steps
Switching the instrument on
> Press
]
.
• 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.
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6 Using the product
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.
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6 Using the product
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:
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6 Using the product
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 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
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6 Using the product
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. t
The measured temperature must be assigned to the superheating or the subcooling side (t cu
/T2 or Δt display. cu oh
<--> t cu
).
Depending on this assignment, t oh
/T1 or Δt oh
/SH or
/SC is shown depending on the selected
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6 Using the product
- 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 t oh
/T1
Condensation pressure
Measured temperature t cu
/T2 or (only with connected temperature probe)
Evaporation pressure
Superheating Δt oh
/SH.
Condensation pressure
Subcooling Δt cu
/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]
.
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7 Maintaining the product
7
- 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 .
- Result is displayed on the low-pressure side.
6.
Press
[Mode]
.
- The measuring mode is displayed.
Maintaining the product
Cleaning the instrument
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).
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Changing batteries/rechargeable batteries
✓ Instrument is switched off.
7 Maintaining the product
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.
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8 Tips and assistance
8 Tips and assistance
8.1. Questions and answers
flashes
The instrument switches off automatically.
Batteries are almost empty.
Residual capacity of the batteries is too low.
uuuu
lights up instead of the parameter display
oooo
lights up instead of the parameter display
The permissible measuring range has been undershot.
> Keep to the permitted measuring range.
The permissible measuring range has been exceeded.
> Keep to the permitted measuring range.
8.2. Measurement parameters
Name Description
Δtoh SH
Δtcu SC Subcooling, condensation pressure to tc
Ev
Co
Refrigerant evaporation temperature
Refrigerant condensation temperature toh T1 Measured tcu T2 Measured temperature, condensation
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8 Tips and assistance
8.3. Error reports
----
is lit up instead of measurement parameter display
Display
EEP FAIL
Sensor or cable defective
> Please contact your dealer or
Testo Customer Service
Eeprom defective
> Please contact your dealer or
Testo Customer Service
8.4. Accessories and spare parts
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
0613 5505
0613 4611
0613 1912
0613 1712
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..
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