To Protect The Water Circuit Against Freezing - Daikin EBLQ011CA3V3 Installer's Reference Manual

NOTICE
In case an optional domestic hot water tank is installed:
▪ A drain device and pressure relief device must be
installed on the cold water inlet connection of the
domestic hot water cylinder.
▪ To avoid back siphonage, it is recommended to install a
non-return valve on the water inlet of the domestic hot
water tank in accordance with the applicable legislation.
▪ It is recommended to install a pressure reducing valve
on the cold water inlet in accordance with the
applicable legislation.
▪ An expansion vessel should be installed on the cold
water inlet in accordance with the applicable legislation.
▪ It is recommended to install the pressure relief valve on
a higher position than the top of the domestic hot water
tank. Heating of the domestic hot water tank causes
water to expand and without pressure relief valve the
water pressure inside the tank can rise above the tank
design pressure. Also the field installation (piping,
tapping points, etc.) connected to the tank is subjected
to this high pressure. To prevent this, a pressure relief
valve needs to be installed. The overpressure
prevention depends on the correct operation of the field
installed pressure relief valve. If this is NOT working
correctly, overpressure will deform the tank and water
leakage may occur. To confirm good operation, regular
maintenance is required.
7.6.4 To protect the water circuit against
freezing
Frost can damage the system. To prevent the hydraulic components
from freezing, the software is equipped with special frost protection
functions, that include the activation of pump, internal heaters, and/
or backup heater operation in case of low temperatures.
However, in case of a power failure, these functions cannot
guarantee protection. It is therefore recommended to add glycol to
the water circuit. The required concentration 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.
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.
Lowest expected Prevent from
outdoor bursting
temperature
–5°C 10%
–10°C 15%
–15°C 20%
–20°C 25%
–25°C 30%
EBLQ+EDLQ011~016CA3V3+W1 + EK(2)CB07CAV3
Daikin Altherma low temperature monobloc
4P538847-1 – 2018.05
The types of glycol that can be used depend on whether the system
contains a domestic hot water tank:
The system contains a domestic
hot water tank
The system does NOT contain a
domestic hot water tank
Prevent from
freezing
15%
25%
35%
—
—
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.
▪ In case of a power supply failure or pump failure, and
NO glycol was added to the system, drain the system.
▪ When water is at standstill inside the system, the
system is very likely to freeze and get damaged.
If...
Only use propylene glycol
You can use either propylene
glycol
(a) Propylene glycol, including the necessary inhibitors,
classified as Category III according to EN1717.
WARNING
Ethylene glycol is toxic.
NOTICE
Glycol absorbs water from its environment. Therefore do
NOT add glycol that has been exposed to air. Leaving the
cap off the glycol container causes the concentration of
water to increase. The glycol concentration is then lower
than assumed. As a result, the hydraulic components
might freeze up after all. Take preventive actions to ensure
a minimal exposure of the glycol to air.
NOTICE
▪ If overpressure occurs, the system will release some of
the liquid through the pressure relief valve. If glycol was
added to the system, take adequate measures so as to
safely recover it.
▪ In any case, make sure that the flexible hose of the
pressure relief valve is ALWAYS free to release
pressure. Prevent water from staying and/or freezing
up inside the hose.
7 Installation
Then...
(a)
(a)
or ethylene glycol
Installer reference guide
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