Daikin EPRA10EAV3 Installer's Reference Manual page 98

8 | Piping installation
Freeze protection by freeze protection valves
Installer reference guide
98
NOTICE
Use ONLY propylene glycol including the required inhibitors, classified as category III
as per EN1717.
Required concentration of glycol
The required concentration of glycol depends on the lowest expected outdoor
temperature, and on whether you want to protect the system from bursting or
from freezing. To prevent the system from freezing, more glycol is required.
Add glycol according to the table below.
Lowest expected outdoor
temperature
–5°C
–10°C
–15°C
–20°C
–25°C
–30°C
INFORMATION
▪
Protection against bursting: the glycol will prevent the piping from bursting, but
NOT the liquid inside the piping from freezing.
▪
Protection against freezing: the glycol will prevent the liquid inside the piping
from freezing.
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 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.
Prevent from bursting
10%
15%
20%
25%
30%
35%
Prevent from freezing
15%
25%
35%
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EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07