7 | Installation
Installer reference guide
50
RZAG71~140N
Sky Air Alpha-series
4P695307-1A – 2024.02
NOTICE
Before completely recharging, perform vacuum drying on the outdoor unit's internal
refrigerant piping as well.
NOTICE
To perform vacuum drying or a complete recharge of the outdoor unit’s internal
refrigerant piping it is necessary to activate the vacuum mode (see "To activate/
deactivate the vacuum mode field setting"[455]) which will open required valves in
the refrigerant circuit so the vacuuming process or recharge of refrigerant can be
done properly.
▪ Before vacuum drying or recharging, activate field setting "vacuum mode".
▪ After finishing vacuum drying or recharging, deactivate field setting "vacuum
mode".
WARNING
Some sections of the refrigerant circuit may be isolated from other sections caused
by components with specific functions (e.g. valves). The refrigerant circuit therefore
features additional service ports for vacuuming, pressure relief or pressurizing the
circuit.
In case it is required to perform brazing on the unit, ensure that there is no pressure
remaining inside the unit. Internal pressures need to be released with ALL the service
ports indicated on the figures below opened. The location is depending on model
type.
Location of service ports:
a Internal service port
b Stop valve with service port (liquid)
c Stop valve with service port (gas)
Typical workflow – Completely recharging refrigerant typically consists of the
following stages:
1 Determining how much refrigerant to charge.
2 Charging refrigerant.
3 Filling in the fluorinated greenhouse gases label, and fixing it to the inside of
the outdoor unit.
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