179
4. Fill refrigerant circuit with refrigerant R290 (pro-
pane) via the Schrader valve of high pressure
side 2 (liquid line): See chapter "Overview of inter-
nal components".
Danger
Oxygen in the refrigerant circuit can cause a
fire or explosion during operation.
When filling the refrigerant circuit ensure that
neither air nor oxygen gets into the refriger-
ant circuit.
Danger
An excessive refrigerant charge leads to a
risk of explosion.
Do not overfill the refrigerant circuit:
■
Weigh the refrigerant bottle before filling.
■
The refrigerant charge is equal to the
weight reduction of the refrigerant bottle.
Max. refrigerant charge: See chapter
"Specification".
5. Close the Schrader valve so it is gas-tight. Fit the
sealing cap. To achieve this, counterhold the valve
body.
Torque for sealing cap union nut: 11 Nm
Torque for valve body: 0,25 Nm
6. Affix a label to the heat pump in a clearly visible
position, with the following content, with date and
signature:
■
Type of topped up refrigerant
■
Amount of topped up refrigerant
7. Carry out the leak test using an explosion-proof
refrigerant detector suitable for R290 (propane).
8. Seal the sealing caps of the low pressure and high
pressure Schrader valves: See chapter "Outdoor
unit maintenance: Overview of internal compo-
nents".
Draining the outdoor unit on the secondary side
If only the outdoor unit is to be drained, shut off the
hydraulic lines to the indoor unit.
Fig. 120
Outdoor unit maintenance
Filling the refrigerant circuit (cont.)
6222080
Maintenance
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