Wolf BWL-1S-05 Installation And Operating Instructions Manual page 26

Height differentials
If the height differential between the indoor and the outdoor units is > 4 m, both refrigerant lines will require oil lift
bends to prevent oil shortages in the compressor.
Outdoor module higher than indoor module
Cooling mode
Injection line
(phase mixture)
Indoor module higher than outdoor module
Liquid line (liquid)
26
Routing the refrigerant lines
Suction line
(gaseous)
Max. 4 m
Heating mode
Hot gas line
(gaseous)
Max. 4 m
Oil lift bend
(on site)
Liquid line (liquid)
Oil lift bend
(on site)
Heating mode
Hot gas line
(gaseous)
Max. 4 m
Cooling mode
Injection line
Suction line
(phase mixture)
(gaseous)
Max. 4 m
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