To Determine If Oil Traps Are Required; Checking The Refrigerant Piping; About Checking The Refrigerant Piping; Precautions When Checking The Refrigerant Piping - Daikin AZQS100B8V1B Installer's Reference Manual

6 Installation
6.4.9 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
6.5 Checking the refrigerant piping
6.5.1 About checking the refrigerant piping
The outdoor unit's internal refrigerant piping has been factory tested
for leaks. You only have to check the outdoor unit's external
refrigerant piping.
Before checking the refrigerant piping
Make sure the refrigerant piping is connected between the outdoor
unit and the indoor unit.
Typical workflow
Checking the refrigerant piping typically consists of the following
stages:
1 Checking for leaks in the refrigerant piping.
2 Performing vacuum drying to remove all moisture, air or
nitrogen from the refrigerant piping.
If there is a possibility of moisture being present in the refrigerant
piping (for example, rainwater may have entered the piping), first
carry out the vacuum drying procedure below until all moisture has
been removed.
6.5.2 Precautions when checking the
refrigerant piping
INFORMATION
Also read the precautions and requirements in the
following chapters:
▪ General safety precautions
▪ Preparation
NOTICE
Use a 2­stage vacuum pump with a non­return valve that
can evacuate to a gauge pressure of − 100.7 kPa (5 Torr
absolute). Make sure the pump oil does not flow oppositely
into the system while the pump is not working.
Installer reference guide
14
Then
a
10 m
b
NOTICE
Use this vacuum pump for R410A exclusively. Using the
same pump for other refrigerants may damage the pump
and the unit.
NOTICE
▪ Connect the vacuum pump to both the service port of
the gas stop valve and the service port of the liquid
stop valve to increase efficiency.
▪ Make sure that the gas stop valve and liquid stop valve
are firmly closed before performing the leak test or
vacuum drying.
6.5.3 Checking refrigerant piping: Setup
f
a
c
R410A
b d e
a Pressure gauge
b Nitrogen
c Refrigerant
d Weighing machine
e Vacuum pump
f Stop valve
6.5.4 To check for leaks
NOTICE
Do NOT exceed the unit's maximum working pressure (see
"PS High" on the unit name plate).
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.
1 Charge the system with nitrogen gas up to a gauge pressure of
at least 200 kPa (2 bar). It is recommended to pressurize to
3000 kPa (30 bar) in order to detect small leaks.
2 Check for leaks by applying the bubble test solution to all
connections.
3 Discharge all nitrogen gas.
INFORMATION
After opening the stop valve, it is possible that the pressure
in the refrigerant piping does NOT increase. This might be
caused by e.g. the closed state of the expansion valve in
the outdoor unit circuit, but does NOT present any problem
for correct operation of the unit.
AZQS100~140B8V1B + AZQS100~140B7Y1B
Split system air conditioners
4P385529­1 – 2014.08