To Determine If Oil Traps Are Required; Checking The Refrigerant Piping; Checking Refrigerant Piping: Setup; To Check For Leaks: Pressure Leak Test - Daikin Sky Air Advance Series Installation Manual

4.2.2

To determine if oil traps are required

If oil flows back into the outdoor unit's compressor, this might cause
liquid compression or deterioration of oil return. Oil traps in the rising
gas piping can prevent this.
If
The indoor unit is installed Install an oil trap every 10 m (height
higher than the outdoor difference).
unit
a Rising gas piping with oil trap
b Liquid piping
The outdoor unit is Oil traps are NOT required.
installed higher than the
indoor unit
4.3

Checking the refrigerant piping

4.3.1

Checking refrigerant piping: Setup

a
A
c
R32
b d e
a
B
c
R32
b d e
A Setup in case of pair
B Setup in case of twin
a Pressure gauge
b Nitrogen
c Refrigerant
d Weighing scale
e Vacuum pump
f Stop valve
g Main piping
h Refrigerant branch kit
i Branch piping
4.3.2

To check for leaks: Pressure leak test

1 Test for leaks by applying a bubble test solution to all piping
connections.
2 Discharge all nitrogen gas.
RZA200+250D7Y1B
Sky Air Advance-series
4P573384-1 – 2019.04
Then
a
10 m
b
f
f
i
g
h
NOTICE
Make sure to use a recommended bubble test solution
from your wholesaler. Do not use soap water, which may
cause cracking of flare nuts (soap water may contain salt,
which absorbs moisture that will freeze when the piping
gets cold), and/or lead to corrosion of flared joints (soap
water may contain ammonia which causes a corrosive
effect between the brass flare nut and the copper flare).
4.3.3

To perform vacuum drying

To remove all moisture from the system, proceed as follows:
1 Check that, with the vacuum pump turned off, the target
vacuum is maintained for at least 1 hour.
4.4

Charging refrigerant

4.4.1

About charging refrigerant

The outdoor unit is factory charged with refrigerant, but in some
cases the following might be necessary:
What
Charging additional refrigerant
Completely recharging refrigerant Example:
Charging additional refrigerant
Before charging additional refrigerant, make sure the outdoor unit's
external refrigerant piping is checked (leak test, vacuum drying).
INFORMATION
Depending on the units and/or the installation conditions, it
might be necessary to connect electrical wiring before you
can charge refrigerant.
Typical workflow – Charging additional refrigerant typically consists
of the following stages:
1 Determining if and how much you have to charge additionally.
2 If necessary, charging additional refrigerant.
3 Filling in the fluorinated greenhouse gases label, and fixing it to
the inside of the outdoor unit.
Completely recharging refrigerant
Before completely recharging refrigerant, make sure the following is
done:
1 All refrigerant is recovered from the system.
2 The outdoor unit's external refrigerant piping is checked (leak
test, vacuum drying).
3 Vacuum drying on the outdoor unit's internal refrigerant piping is
performed.
NOTICE
Before completely recharging, perform vacuum drying on
the outdoor unit's internal refrigerant piping as well.
4 Installation
When
When the total liquid piping
length is more than specified
(see later).
▪ When relocating the system.
▪ After a leak.
Installation manual
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