Daikin EWYA004D2V3P Installer's Reference Manual page 69

Freeze protection by freeze protection valves
EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09
NOTICE
▪
The required concentration might differ depending on the type of glycol. ALWAYS
compare the requirements from the table above with the specifications provided
by the glycol manufacturer. If necessary, meet the requirements set by the glycol
manufacturer.
▪
The added concentration of glycol should NEVER exceed 35%.
▪
If the liquid in the system is frozen, the pump will NOT be able to start. Mind that
if you only prevent the system from bursting, the liquid inside might still freeze.
▪
When water is at standstill inside the system, the system is very likely to freeze
and get damaged.
Glycol and the maximum allowed water volume
Adding glycol to the water circuit reduces the maximum allowed water volume of
the system. For more information, see
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.
8
"Maximum water
c
b c
b
Description
Piping installation
|
4
volume" [ 62].
Installer reference guide
69