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4.1.2 Installation of refrigerant piping
When installing the refrigerant piping, the following limitations and restrictions need to be observed:
● Maximum actual and equivalent piping length
● Maximum branch pipe length to AHU Kit
● Maximum branch pipe length difference (between longest and shortest piping from the
first branch)
● Dimensions of connecting pipes to heat exchanger of AHU system
● Precharged pipe length of outdoor unit
● Additional refrigerant charging amount for longer pipe runs
● Other technical data and limitations of the relevant outdoor units
● Local piping design regulations
● Best practices for piping design
● Instructions for the safe handling of R32 (see →
of R32, p.
i
Important
For technical data, limitations and restrictions not mentioned in this document, refer to the technical
documentation for the relevant ECOi, ECO G, PACi and PACi NX outdoor units.
4.2
Installation of expansion valve
Installation of expansion valve – ECOi and ECO G systems
ATTENTION
!
Damage to the expansion valve wires
Exposing the wires of the expansion valve to the outside and/or to direct sunlight might damage the
wires and should therefore be avoided.
► Attach the AHU Kit either directly to the Air Handling Unit or to a wall nearby and make
sure that it is not exposed to direct sunlight.
► Use protecting wire ducts to avoid exposing the wires of thermistors and the electronic
expansion valve to the outside.
When installing the expansion valve, the following limitations and restrictions need to be observed:
● Wires must not be installed externally. Cable protection such as conduit is required.
● Do not detach connector.
● The distance from AHU heat exchanger must not exceed 6 m.
● Pipe reducers must be installed in the field where applicable.
For example, for 10HP ECOi systems, piping size to outdoor unit is Ø 9.52 mm
(instead of Ø 15.88 mm).
AHU Kit – Installation Instructions – 07/2023
9)
AHU heat exchanger
Add strainers (field supplied) if not
Pipe to the outdoor unit
Max. length: 6 m
Flare connection
Alternative brazing
Pipe to the outdoor unit
1.3 Instructions for the safe handling
Expansion valve (accessory)
included in the valve piping
Pipe to the AHU heat exchanger
Installation
4
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