Daikin Altherma 3 H HT W EPRA14DAV3 Installer's Reference Manual page 93

EPRA14~18DAV3+W1 + ETBH/X16EF6V+9W
Daikin Altherma 3 H HT W
4P644736-1 – 2021.02
Types of glycol
The types of glycol that can be used depend on whether the system contains a
domestic hot water tank:
If...
The system contains a domestic hot
water tank
The system does NOT contain a
domestic hot water tank
(a)
Propylene glycol, including the necessary inhibitors, classified as Category III according to
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 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
Only use propylene glycol
You can use either propylene glycol
ethylene glycol
Prevent from bursting
10%
15%
20%
25%
30%
35%
"Maximum water
8 Piping installation
|
Then...
(a)
(a)
Prevent from freezing
15%
25%
35%
—
—
—
4
volume" [ 86].
Installer reference guide
or
93