Daikin ETVH16SU23EA6V [12/44] To connect the recirculation piping
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Daikin ETVH16SU23EA6V [12/44] To connect the recirculation piping

Daikin ETVH16SU23EA6V [12/44] To connect the recirculation piping
5 Piping installation
Installation manual
12
ETVH16SU18+23EA6V
Daikin Altherma 3 H HT F
4P644729-1 – 2021.02
NOTICE
▪ All pipework and fittings must be flushed free of flux
and debris prior to installing the domestic hot water
tank kit. Failure to do this may cause irreparable
damage to the tank kit controls. Flush the system by
opening the hot water tap.
▪ The tundish pipework must be a 22mm metal pipe with
a minimal vertical length of 300mm below the tundish
before any elbows or bends in the pipework. All
pipework must have a continuous fall of 1 in 200
thereafter. Maximum permitted (equivalent) length of
22 mm pipework is 9 m. Each bend or elbow is
equivalent to 0.8m of pipework.
5.2.3 To connect the recirculation piping
Prerequisite: Only required if you need recirculation in your system.
1 Remove the top panel from the unit, see "4.2.1 To open the
indoor unit"[47].
2 Cut out the rubber grommet on top of the unit, and remove the
stop. The recirculation connector is placed below the hole.
3 Route the recirculation piping through the grommet and connect
it to the recirculation connector.
4 Reattach the top panel.
5.2.4 To fill the water circuit
To fill the water circuit, use a field supply filling kit. Make sure you
comply with the applicable legislation.
NOTICE
Make sure both air purge valves (one on the magnetic filter
and one on the backup heater) are open.
All automatic air purge valves must remain open after
commissioning.
5.2.5 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 such as water pipe freeze prevention and drain prevention
(see the installer reference guide) 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
About freeze protection by glycol
Adding glycol to the water lowers the freezing point of water.
WARNING
Ethylene glycol is toxic.
WARNING
Due to the presence of glycol, corrosion of the system is
possible. Uninhibited glycol will turn acidic under the
influence of oxygen. This process is accelerated by the
presence of copper and high temperatures. The acidic
uninhibited glycol attacks metal surfaces and forms
galvanic corrosion cells that cause severe damage to the
system. Therefore it is important that:
▪ the water treatment is correctly executed by a qualified
water specialist,
▪ a glycol with corrosion inhibitors is selected to
counteract acids formed by the oxidation of glycols,
▪ no automotive glycol is used because their corrosion
inhibitors have a limited lifetime and contain silicates
which can foul or plug the system,
▪ galvanized pipes are NOT used in glycol systems since
the presence may lead to the precipitation of certain
components in the glycol's corrosion inhibitor.
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.
Types of glycol
The types of glycol that can be used depend on whether the system
contains a domestic hot water tank:
If… Then…
The system contains a domestic
hot water tank
Only use propylene glycol
(a)
The system does NOT contain a
domestic hot water tank
You can use either propylene
glycol
(a)
or ethylene glycol
(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.

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