5 Installation
Installation manual
13
EJHA04AAV3
Daikin Altherma hybrid monobloc – Heat pump module
4P530607-1B – 2018.10
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
outdoor
temperature
Prevent from
bursting
Prevent from
freezing
–5°C
10%
15%
–10°C
15%
25%
–15°C
20%
35%
–20°C
25%
—
–25°C
30%
—
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…
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.
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.
WARNING
Due to 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, refer to the
chapter "To check the water volume and flow rate" in the installer
reference guide.
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:
a
c
c
b4
b3
b2
b1
b4
b3
*
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
Description
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.
