Daikin EWAA0 DAV3P Series Installer's Reference Manual page 72

8 | Piping installation
Freeze protection by freeze protection valves
Installer reference guide
72
Glycol setting
NOTICE
If glycol is present in the system, setting [E-0D] must be set to 1. If the glycol setting
is NOT set correctly, the liquid inside the piping can freeze.
About freeze protection valves
It is the responsibility of the installer to protect the field piping against freezing.
When no glycol is added to the water, you can use freeze protection valves at all
lowest points of the field piping to drain the water from the system before it can
freeze.
To install freeze protection valves
To protect the field piping against freezing, install the following parts:
a
a Automatic air intake
b Freeze protection valve (optional – field supply)
c Normally closed valves (recommended – field supply)
Part
An automatic air intake (for air supply) should be installed at the
a
highest point. For example, an automatic air purge.
Protection for the field piping. The freeze protection valves must
b
be installed:
▪ vertically to allow water to flow out properly and free from
obstructions.
▪ at all lowest points of the field piping.
▪ in the coldest part and away from heat sources.
Note: Leave at least 15 cm clearance from the ground to prevent
ice from blocking the water exit.
Isolation of water inside the house when there is a power
c
interruption. Normally closed valves (located indoors near the
piping entry/exit points) can prevent that all water from indoor
piping is drained when the freeze protection valves open.
▪ When there is a power interruption: The normally closed valves
close and isolate the water inside the house. If the freeze
protection valves open, only the water outside the house is
drained.
▪ In other circumstances (example: when there is a pump failure):
The normally closed valves remain open. If the freeze protection
valves open, the water from inside the house is also drained.
c
b
c
b
Description
EWAA011~016DA + EWYA009~016DA
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P620242-1 – 2020.06