Checking The Refrigerant Piping; About Checking The Refrigerant Piping; Precautions When Checking The Refrigerant Piping - Daikin Altherma 3 R F Installer's Reference Manual

7.6 Checking the refrigerant piping

7.6.1 About checking the refrigerant piping

7.6.2 Precautions when checking the refrigerant piping

ERGA04~08DAV3(A) + EHVZ04+08S18+23DA6V+9W7
Daikin Altherma 3 R F
4P618957-1 – 2020.03
b Refrigerant gas connection
2 Connect the gas stop valve from the outdoor unit to the refrigerant gas
connection of the indoor unit.
NOTICE
It is recommended that the refrigerant piping between indoor and outdoor unit is
installed in a ducting or the refrigerant piping is wrapped with finishing tape.
INFORMATION
When the indoor unit is installed in a place with limited space, an optional pipe bend
(EKHVTC) kit can be installed to facilitate the connection to the refrigerant gas and
liquid connections of the indoor unit. For installation instructions, see the instruction
sheet of the pipe bend kit.
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, water may have entered the piping), first carry out the vacuum drying
procedure below until all moisture has been removed.
INFORMATION
Also read the precautions and requirements in the following chapters:
▪
General safety precautions
▪
Preparation
NOTICE
Use a 2-stage vacuum pump with a non-return valve that can evacuate to a gauge
pressure of −⁠ 1 00.7 kPa (−⁠ 1 .007 bar)(5 Torr absolute). Make sure the pump oil does
not flow oppositely into the system while the pump is not working.
NOTICE
Use this vacuum pump for R32 exclusively. Using the same pump for other
refrigerants may damage the pump and the unit.
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Installer reference guide
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