177
Before commencing work, note the "Checklist for main-
tenance work" on page 136 165 onwards.
Also take into account the following points:
■
Only extraction equipment authorised for R290 (pro-
pane) that has been regularly inspected may be
used.
Check the condition of the extraction equipment,
including the service record.
■
Only use refrigerant bottles suitable for R290, e.g.
special recycling bottles. The refrigerant bottles must
be correspondingly labelled.
The refrigerant bottles must be equipped with a
safety valve and permanently attached shut-off
valves.
■
Check whether a sufficient number of recycling bot-
tles is available.
■
Do not mix together different refrigerants in a single
recovery bottle.
■
Have suitable transport equipment ready for the
refrigerant bottles (if required).
■
Check the availability of personal protective equip-
ment and its proper use.
■
Ensure the refrigerant circuit and all connections
used are free from leaks.
■
Provide calibrated scales to determine the amount of
extracted refrigerant.
01. Check the condition of the heat pump. Check
whether the service intervals have been adhered
to.
02. Isolate the system from the power supply. Safe-
guard against unauthorised reconnection.
Danger
Escaping refrigerant can lead to explosions
that result in very serious injuries.
Do not introduce any power sources or igni-
tion sources into the safety zone.
03.
!
Please note
Pressure fluctuations occur when the refrig-
erant circuit is drained. This can cause the
heating water in the outdoor unit to freeze.
First drain the outdoor unit on the secon-
dary side.
04. Check whether the safety instructions for work on
the refrigerant circuit are being adhered to: See
"Safety instructions".
05. Place the refrigerant bottle on the scales.
Battery operated scales may only be used outside
the safety zone.
06. Connect the refrigerant bottle to the extraction
equipment. Connect the extraction equipment to
the Schrader valves on the high pressure and low
pressure side of the refrigerant circuit via the
manifold.
07. Extract the refrigerant from all parts of the refriger-
ant circuit using the extraction equipment. If nec-
essary, open the electronic expansion valves with
the appropriate permanent magnet.
Note
■
The refrigerant extraction must be continuously
monitored by an authorised contractor.
■
Do not overfill the refrigerant bottle, max. 80 %
of the permissible capacity.
■
Do not exceed the permissible design pressure
of the refrigerant bottle.
■
Do not mix the refrigerant with other refrigerants.
■
Observe the following technical rules on opera-
tional reliability and hazardous materials:
TRGS 510, TRBS 3145, TRGS 745
08. Separate the refrigerant bottle from the refrigerant
circuit. Close the connection securely. Label the
refrigerant bottle according to the statutory
requirements. Dispose of the refrigerant bottle in a
suitable disposal/recycling facility.
09. Flush the refrigerant circuit with dry nitrogen for
5 minutes.
10. Fill the refrigerant circuit with dry nitrogen up to a
positive pressure of 5 bar (500 kPa).
11. Release the positive pressure.
12. Evacuate the refrigerant circuit.
Absolute pressure for vacuum according to
EN 378: < 2.7 mbar (< 270 Pa)
Danger
Escaping refrigerant can lead to explosions
that result in very serious injuries.
Ensure the vacuum pump outlet is outside
the safety zone.
13. Carry out a static vacuum test:
Absolute pressure may not exceed 10 mbar
(1 kPa) for at least 30 min.
If the vacuum is not maintained, repeat from
step 8.
Outdoor unit maintenance
Extracting the refrigerant
6222080
Maintenance
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