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5 Installation
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.
Adding glycol to the water circuit reduces the maximum allowed
water volume of the system. For more information, see the manual
of the expansion vessel.
Freeze protection by freeze protection valves
When no glycol is added to the water, you can use freeze protection
valves to drain the water from the system before it can freeze. To do
so, install the following parts:
b2
a
*
b1
a+b1+b2
Protection for the outdoor unit (*: there are 2 possibilities
to connect b2; see below)
b3+b4
Protection for the field piping
c
Isolation of water inside the house when there is a power
interruption
Part
a+b1+b2
(Mandatory – Delivered as accessory).
a Connection piece for b1
b1 Freeze protection valve (for water drainage)
b2 Vacuum breaker (head-up for air supply)
These parts are necessary to protect the piping inside
the outdoor unit against freezing.
Note: These parts do NOT protect the field piping
against freezing.
Installation manual
14
b3
c
b4
c
b3
b4
Description
Part
b3+b4
Use AFVALVEHY2.
It is the installer's responsibility to protect the field
piping against freezing. One possibility is to install
freeze protection valves at all lowest points of the field
piping. If you do so, always install the freeze protection
valves in pair:
b3 Vacuum breaker (head-up for air supply)
b4 Freeze protection valve (head-down for water
drainage)
c
c Normally closed valves
(Recommended – Field supply).
Normally closed valves can prevent that all water from
the system is drained when the freeze protection valves
open.
▪ When there is a power interruption: The normally
closed valves close and isolate the water inside the
house. If the freeze protection valves open, only the
water outside the house is drained.
▪ In other circumstances (example: when there is a
pump failure): The normally closed valves remain
open. If the freeze protection valves open, the water
from inside the house is also drained.
To connect a+b1+b2
2
2×
2×
a
Connection piece for b1
b1
Freeze protection valve (for water drainage)
b2
Vacuum breaker (head-up for air supply)
1 Open the top plate.
2 Open the front plate.
3 Open the rear plate.
4 Connect a+b1 as follows:
Daikin Altherma H Hybrid – Heat pump module
Description
b3
b4
2×
1
3
4×
4 (a+b1)
5 (b2)
EJHA04AAV3
4P530607-1D – 2020.02
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