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Refrigerant pipes
Technical information
The refrigerant pipes, the indoor and outdoor units are pre-filled with refrigerant R410A.
The refrigerant R410A belongs to group 1 of refrigerants according to VBG 20. It is non-combustible and does not cause serious
damage to human health.
The following must be observed when installing refrigerant pipes:
• The refrigerant should not come into contact with the eyes (if necessary, protective goggles should be worn).
• Refrigerants can cause frostbite in contact with the skin (if necessary, suitable protective clothing, such as gloves, should
be worn).
• Contact with open flames or very hot surfaces can cause the refrigerant to decompose and give off poisonous gases.
• Caution! Do not smoke while disconnecting or closing refrigerant pipes!
• Do not inhale the refrigerant!
• Refrigerant is heavier than air; if it leaks it collects on the ground.
• In high concentrations it can cause a lack of oxygen. There is a danger of suffocation.
A defective refrigerant pipe must be properly disposed of by a qualified specialist company or the authorised customer service.
Installation
If possible, the refrigerant pipes should be routed in suitable conduits (e.g. conduits for electrical installations) which allow the
pipes to be replaced in case of replacement or repair.
• Subsequently wrapping the refrigerant pipes with cloth adhesive tape protects the line insulation from damages due to UV
rays and mechanical impact (rubbing against walls, bird bites). As an additional benefit, it makes the installed pipes more
rigid - thereby reducing vibration.
• The pipes may not have more than three bends in succession and not more than 12 bends over their entire length.
• The number of bends should be kept to a minimum.
• The radius of the bends must be at least 3.5 times the external diameter.
• Install the pipes with a downward slope toward the outdoor unit or wind them up to prevent residues of refrigerant oil.
If the height difference between indoor and outdoor unit is greater than 3 metres, a siphon-type bend must be created every 3
metres of height difference. For example, 2 bends at 6 metre height, 3 bends at 9 metre height, etc.
Provide a siphon every 3
vertical meters.
Oil separator
Refrigerant flow
Outdoor unit installed higher
than the indoor unit
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