6 Installation
Installer reference guide
17
RZQG7 RZQG71~12 RZQG140L7Y1L
Split system air conditioners
4P473074-1A – 2019.04
NOTICE
Before completely recharging, perform vacuum drying on
the outdoor unit's
internal
refrigerant piping as well. To do
so, use the internal service port of the outdoor unit
(between the heat exchanger and the 4‑way valve). Do
NOT use the service ports of the stop valves, because
vacuum drying cannot be performed properly from these
ports.
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.
RZQG71_V1
a
b
c
RZQG71_Y1
a
b
c
RZQG100~140_Y1
a
b
c
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.
6.6.2
Precautions when charging refrigerant
INFORMATION
Also read the precautions and requirements in the
following chapters:
▪ General safety precautions
▪ Preparation
6.6.3
To determine the additional refrigerant
amount
To determine if adding additional refrigerant is necessary
If
Then
L1 ≤ chargeless length
L1 (m)
Chargeless length=
▪ 10 m (size‑down)
▪ 30 m (standard)
▪ 15 m (size‑up)
You do not have to add
additional refrigerant.
L1 > chargeless length
You must add additional
refrigerant.
For future servicing, encircle the
selected amount in the tables
below.
INFORMATION
Piping length is the largest one-way length of liquid piping.
