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5.3.2
To provide drainage for the pressure relief
valve
NOTICE
If overpressure occurs, the system will release some of the
liquid through the pressure relief valve. The pressure relief
valve of the outdoor unit is designed to open at 3 bar.
If glycol was added to the system, take adequate
measures to safely recover it when the pressure relief
valve opens.
In any case, make sure that the flexible hose of the
pressure relief valve is ALWAYS free to release pressure.
a
Pressure relief valve
b
Flexible hose (drain)
1 Open the top plate, front plate, and rear plate. See
unit" [ 4 10].
open the outdoor
2 Make a cross-cut in the rubber grommet on the rear plate.
3 Route the flexible hose through the grommet.
4 Close the rear plate.
5 Pull the flexible hose with a light force to make sure that the
flexible hose slopes down. This prevents water from staying
and/or freezing inside the hose.
6 Close the front plate and top plate.
7 If glycol was added to the system, take adequate measures to
safely recover it when the pressure relief valve opens.
5.3.3
To protect the water circuit against
freezing
About freeze protection
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 in case of low
temperatures.
However, in case of a power failure, these functions cannot
guarantee protection.
Do one of the following to protect the water circuit against freezing:
▪ Add glycol to the water. Glycol lowers the freezing point of the
water.
▪ Install freeze protection valves. Freeze protection valves drain the
water from the system before it can freeze.
NOTICE
If you add glycol to the water, do NOT install freeze
protection valves. Possible consequence: Glycol leaking
out of the freeze protection valves.
Freeze protection by glycol
EJHA04AAV3
Daikin Altherma H Hybrid – Heat pump module
4P530607-1D – 2020.02
a b
"5.1.1 To
Adding glycol to the water lowers the freezing point of the water.
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%
–30°C
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.
▪ When water is at standstill inside the system, the
system is very likely to freeze and get damaged.
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.
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.
5 Installation
Prevent from
freezing
15%
25%
35%
—
—
—
Then...
(a)
Only use propylene glycol
You can use either propylene
(a)
glycol
or ethylene glycol
Installation manual
13
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