Daikin ERLA03DAV3, Installer'S Reference Manual, Page: 59 / 192

7 | Piping installation
Installer reference guide
59
ERLA EHFZ03S18DJ3V
Daikin Altherma 3 R F
4P596821-1A – 2020.05
The indoor unit is installed at the highest point in the water circuit. The total water
volume in the water circuit is 250 l.
Actions:
▪ Because the total water volume (250 l) is more than the default water volume
(200 l), the pre-pressure must be decreased.
▪ The required pre-pressure is:
Pg = (0.3+(H/10)) bar = (0.3+(0/10)) bar = 0.3 bar
▪ The corresponding maximum water volume at 0.3 bar is 290 l. (See the graph in
"Maximum water volume" [
4
57]).
▪ Because 250 l is lower than 290 l, the expansion vessel is appropriate for the
installation.
7.3 Connecting the refrigerant piping
7.3.1 About connecting the refrigerant piping
Before connecting the refrigerant piping
Make sure the outdoor and indoor unit are mounted.
Typical workflow
Connecting the refrigerant piping involves:
▪ Connecting the refrigerant piping to the outdoor unit
▪ Connecting the refrigerant piping to the indoor unit
▪ Insulating the refrigerant piping
▪ Keeping in mind the guidelines for:
- Pipe bending
- Flaring pipe ends
- Brazing
- Using the stop valves
7.3.2 Precautions when connecting the refrigerant piping
INFORMATION
Also read the precautions and requirements in the following chapters:
▪
"1 General safety precautions" [
4
6]
▪
"7.1 Preparing refrigerant piping" [
4
52]
DANGER: RISK OF BURNING/SCALDING
CAUTION
▪
Do NOT use mineral oil on flared part.
▪
Do NOT reuse piping from previous installations.
▪
NEVER install a drier to this R32 unit to guarantee its lifetime. The drying material
may dissolve and damage the system.