178
14. Repeat steps 8 to 10 until there is no more refrig-
erant in the refrigerant circuit.
Note
On the final purging process, release the positive
pressure down to atmospheric pressure. Do not
evacuate further.
This is especially important if brazing/soldering
work is to be carried out on the refrigerant circuit.
15. Once the refrigerant has been completely evacu-
ated, close the Schrader valves so they are gas-
tight. Fit the sealing cap. To achieve this, counter-
hold the valve body.
Torque for dust cap union nut: 11 Nm
16. Affix a label to the outdoor unit in a clearly visible
position, containing the following information, with
date and signature:
■
Outdoor unit works with flammable refrigerant
R290 (propane).
■
System has been taken out of use.
■
Refrigerant has been extracted.
■
Outdoor unit contains nitrogen.
■
Outdoor unit may contain residual flammable
refrigerant.
Testing pressure resistance
Danger
Excessive pressure can cause damage to the
system and hazards due to high pressure and
escaping refrigerant.
Observe the permissible test pressure.
1. Connect the test device on the low pressure side
and high pressure side 1.
Or
Connect the test device on the low pressure side
and high pressure side 2.
2. Carry out a pressure test with nitrogen:
Test pressure:
■
Output size up to 13 kW:
1.43 x permissible operating pressure
■
Output size from 16 kW:
1.1 x permissible operating pressure
Max. test pressure: 35 barg
Permissible operating pressure: See chapter
"Specification".
Filling the refrigerant circuit
In comparison to non-flammable refrigerants, the fol-
lowing points must additionally be observed when
topping up flammable refrigerants:
■
Do not use the same fill valve for different refriger-
ants.
■
Position refrigerant bottles vertically.
Before commencing work, observe chapter "Checklist
for maintenance work": See page.
1. Check whether the safety instructions for work on
the refrigerant circuit are being adhered to: See
chapter "Safety instructions".
2. Earth the refrigerant circuit.
3. Ensure the following conditions for filling are met:
■
Refrigerant circuit has been drained and evacu-
ated: See chapter "Extracting refrigerant".
■
Absolute pressure before filling: < 2.7 mbar
(< 270 Pa)
■
If any components were replaced, observe all
information in the separate installation instruc-
tions.
■
After performing any repairs (e.g. soldering/braz-
ing, replacing components) first carry out a pres-
sure resistance test: See chapter "Testing pres-
sure resistance".
Outdoor unit maintenance
Extracting the refrigerant (cont.)
6222080
Maintenance
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