testo 550 · Digital manifold
Instruction manual
2
2 Safety and the environment
1 Content
1 Content .....................................................................................................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 probe.................................................................11
6.1.2.
Switching the instrument on ...........................................................................11
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
3
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.
- ...
Menu
[OK]
... | ...
Result of an action.
Elements of the instrument, the instrument displays or the program interface.
Elements of the instrument, the instrument displays or the program interface.
Functions/paths within a menu.
4
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.
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.
5
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
Pressure media
Meas. cycle
Measurement channels
Interfaces
FCKW, FKW, N, H
2
0.75 s
Quantity: 4
O
Pressure connections: 3 x 7/16" UNF
NTC measurement
Measuring ranges Pressure measuring range HP/LP:
-1 to 40 bar (rel)/-14.7 to 580 psi (rel)/
100 to 4000 kPa (rel)/0.1 to 4 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
6
3 Specifications
Characteristic
Resolution
Accuracy (nominal temperature
22 °C/71.6 °F)
Values
Pressure resolution: 0.01 bar/0.1 psi/
1 kPa/0.001 MPa
Temperature resolution: 0.1 °C/0.1 °F
Pressure: ±0.75 % of final value (±1 digit)
Temperature: ±0.5 K (±1 digit)
No. of refrigerants 32
Selectable refrigerants
No refrigerant, R12, R22, R123, R134a,
R290, R401A, R401B, R402A, R402B,
R404A, R406A, R407A, R407C, R408A,
R409A, R410A, R414B, R416A, R417A,
R420A, R421A, R421B, R422A, R422B,
R422D, R424A, R434A, R437A, R502,
R503, R507, R718 (H2O)
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. 40 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
7
4 Product description
4 Product description
4.1. Overview
Display and control elements
8
1
Mini-DIN probe socket for NTC temperature probe, with socket cover
2
Foldable suspension device, with eyelet for padlock (on rear)
3
Display. Instrument status icons:
Icon Significance
Battery capacity: >75 %/>50 %/>25 %/<10 %
/ /
Select measuring mode (see Selecting the measuring mode, page 13)
4
Battery compartment. It is not possible to charge rechargeable batteries in the instrument!
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.
9
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.
10
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 probe
For measurement of the pipe temperature and for the automatic calculation of overheating and undercooling, an NTC temperature probe (accessory) must be connected.
Probes must be connected before the measuring instrument is switched on so that they are recognized by the measuring instrument.
6.1.2. Switching the instrument on
>
Press
[ ]
.
Zeroing pressure sensors
Carry out a zeroing of the pressure sensors before every measurement.
✓ The connections of the low-pressure and high-pressure side must be depressurized (ambient pressure).
> Press button to perform zeroing.
Connecting the refrigerant hoses
✓ The valve positioners are closed.
1.
Connect refrigerant hoses for low-pressure side (blue) and highpressure side (red) to the measuring instrument.
2.
Connect refrigerant hoses to the system.
11
6 Using the product
WARNING
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.
> Send the measuring instrument to Testo Customer Service for a technical check for your own safety.
> 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.
Setting the refrigerant
1.
Press
[R, Start/Stop]
.
- The refrigerant menu is opened and the currently selected refrigerant flashes.
2.
Set the refrigerant:
Key functions
Representation Explanation
[▲]
or
[▼]
Change refrigerant
[R, Start/Stop]
Confirm setting and leave the refrigerant menu.
Refrigerant that can be set
Representation Explanation
R...
Refrigerant number of the refrigerant in accordance with ISO 817
...T
---
testo special designation for certain refrigerants
No refrigerant selected.
Example "Set refrigerant R401B"
1.
Press
[▲]
or
[▼]
repeatedly until
R401B
flashes.
2.
Press
[R, Start/Stop]
to confirm the setting.
12
6 Using the product
Ending the refrigerant selection
> Press
[R, Start/Stop]
or automatically after 30 s if no button was 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.
Refrigeration system
Heat pump
Normal functionality of the digital manifold
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 lowpressure side is 1 bar higher than the pressure on the highpressure 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.
13
6 Using the product
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).
> Measures with the occurrence of danger.
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 (t oh
<--> t
Depending on this assignment, t oh
/T1 or Δt oh
/SH or t cu
/T2 or
Δt cu cu
).
/SC is shown depending on the selected display.
- Reading and display illumination flash:
• 1 bar before reaching the critical pressure of the refrigerant,
• upon exceeding the max. permissible pressure of 40 bar.
14
6 Using the product
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 temperaturecompensated 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).
2.
Start the leakage test: Press
[R, Start/Stop]
.
3.
End the leakage test: Press
[R, Start/Stop]
.
- Result is displayed.
4. Confirm message: Press
[Mode]
.
- You automatically jump to the evacuation/vacuum display menu.
15
7 Maintaining the product
7
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 or soap suds can be used.
Keeping connections clean
> Keep screw connections clean and free of grease and other deposits, clean with a moist cloth as required.
Exchanging refrigerant hoses regularly
WARNING
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.
> Send the measuring instrument to Testo Customer Service for a technical check for your own safety.
> 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.
Removing oil residues
> Carefully blow out oil residues in valve block using compressed air.
16
7 Maintaining the product
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).
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.
17
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
18
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.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.
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0970 5501 en 01 V01.00
