Connecting Water Piping; About Connecting The Water Piping; Precautions When Connecting The Water Piping - Daikin EWYA004D2V3P Installer's Reference Manual

8.2 Connecting water piping

8.2.1 About connecting the water piping

8.2.2 Precautions when connecting the water piping

EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09
No actions or adjustments are required.
Example 2
The outdoor 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
(185 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 270 l. (See the graph in
"Maximum water volume" [
▪ Because 250 l is lower than 270 l, the expansion vessel is appropriate for the
installation.
Before connecting the water piping
Typical workflow
Connecting the water piping typically consists of the following stages:
1 Connecting the water piping of the outdoor unit.
2 Connecting the water piping of the external backup heater kit (if applicable).
3 Protecting the water circuit against freezing (addition of glycol or installation of
freeze protection valves).
4 Filling the water circuit.
5 Insulating the water piping.
INFORMATION
For instructions regarding the external backup heater kit, see:
▪
The installation manual of the backup heater kit
▪
"To connect the backup heater
installation manual of the backup heater)
INFORMATION
Also read the precautions and requirements in the following chapters:
▪
"2 General safety
▪
"8.1 Preparing water
4
62]).
4
kit" [ 82] (this topic partially supersedes the
4
precautions" [ 9]
piping" [ 4 59]
8 Piping installation
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Installer reference guide
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