Charging Refrigerant; About Charging Refrigerant - Daikin Altherma 3 R F Installer's Reference Manual

7 | Installation

7.7 Charging refrigerant

7.7.1 About charging refrigerant

Installer reference guide
86
If the pressure...
Increases
3 Vacuum the system for at least 2 hours to a manifold pressure of −0.1 MPa
(−1 bar).
4 After turning the pump OFF, check the pressure for at least 1 hour.
5 If you do NOT reach the target vacuum or CANNOT maintain the vacuum for
1 hour, do the following:
▪ Check for leaks again.
▪ Perform vacuum drying again.
NOTICE
Make sure to open the stop valves after installing the refrigerant piping and
performing vacuum drying. Running the system with the stop valves closed may
break the compressor.
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.
The outdoor unit is factory charged with refrigerant, but in some cases the
following might be necessary:
What
Charging additional refrigerant
Completely recharging refrigerant
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.
Then...
There is moisture in the system. Go
to the next step.
When
When the total liquid piping length is
more than specified (see later).
Example:
▪ When relocating the system.
▪ After a leak.
ERGA04~08DAV3(A) + EHVH/X04+08S18+23DA/DJ3V+6V+9W7
Daikin Altherma 3 R F
4P618947-1 – 2020.03