General Operation - Daikin Sky Air FAA71BUV1B Service Manual

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General operation

2 General operation
d
a Compressor
b Indoor heat exchanger (up to 4 indoor units)
c Expansion valve
d Outdoor heat exchanger
e 4‑way valve
f Stop valve
Service manual
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The Sky-Air is typically used for cooling or heating in commercial applications.
Some units also have settings to perform technical cooling. The medium which is
used to transfer the heat from inside to outside or vice versa, is refrigerant.
There are four different piping combinations to indoor units:
▪ Pair
▪ Twin
▪ Triple
▪ double twin.
They all have the same operation principle. Unlike multi‑system, they have only
one main expansion valve controlling the refrigerant flow to all indoor unit(s).
c
e
a
In case of heating, the compressor builds up pressure and hence the temperature
of the refrigerant is increased. The hot refrigerant is blown into the room by fan(s)
which blow over heat exchanger(s). Colder refrigerant flows back to the outdoor
unit, where temperature is further decreased by expansion through an expansion
valve. After the expansion valve, the refrigerant is capable of taking up heat again.
This is enabled by a fan that sucks outdoor air over a heat exchanger. This
refrigerant is then transported to the compressor where temperature is further
built up again and the cycle starts again. For cooling, it's just the other way round.
Outdoor units
Sky-Air systems have combination limits for different types of outdoor units (refer
to Daikin Business Portal) and also limits for piping length and connection ratio for
each indoor unit combination pattern (refer to the Engineering Databook of
outdoor units).
f
b
f
b
FAA71+100BUV1B
Sky Air indoor units
ESIE22-01 – 2022.02