Daikin Altherma 3 H HT ECH2O ETSH16P30D Guide De Référence Installateur page 30

3 Set-up and installation
Fig. 3-49 Filling the heating circuit
1 Filling hose with non-return valve (and pressure gauge
2 Combined filling and draining valve
3 Heater ball valve inflow
4 Heater ball valve return flow
5.1 Valve drive
5.2 Unlocking key of the drive lock
6 Water tap
7 Automatic vent valve
8 Pressure gauge
3UV DHW 3-way distribution valve (distribution valve, hot water/heat-
ing/heating support)
3UVB1 3-way distribution valve
MAG Diaphragm expansion vessel
Protecting 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 guaran-
tee protection. It is therefore recommended to add glycol to the wa-
ter circuit. The required concentration depends on the lowest expec-
ted 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 protects the
pipes against bursting, but does NOT protect the fluid
in the pipes against freezing.
▪ Protection against freezing: the glycol protects the fluid
in the pipes against freezing.
(1)
if not already installed in the heating system
Installer reference guide
30
Lowest anticipated
outside temperature
-5 °C
-10 °C
-15 °C
-20 °C
-25 °C
Tab. 3-4 Required glycol concentration
CAUTION
▪ The required concentration may vary 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 require-
ments set by the glycol manufacturer.
▪ The added concentration of glycol must NEVER ex-
ceed 35%.
▪ If the fluid in the system is frozen, the pump CANNOT
start. Mind that if you only prevent the system from
bursting, the liquid inside might still freeze.
▪ If NO glycol has been added to the system and a power
failure or a pump failure occurs, drain the water from
the system.
▪ When the water inside the system is stationary, it can
easily freeze and thus damage the system.
CAUTION
Use only propylene glycol including the required inhibitors,
classified as category III as per EN 1717.
CAUTION
(1)
)
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.
CAUTION
▪ If overpressure occurs, the system releases some of
the fluid through the pressure relief valve. If glycol was
added to the system, take adequate measures so as to
safely recover it.
▪ Under all circumstances, make sure that the hose of
the pressure relief valve is ALWAYS free to release the
pressure. Prevent water from staying and/or freezing
up inside the hose.
Heat pump (indoor unit) with integrated heat accumulator
Protection against Protection against
bursting freezing
10% 15%
15% 25%
20% 35%
25%
30%
Daikin Altherma ETS(X/H)(B)-D
008.1447299_00 – 06/2019 – EN