Table of Contents
Advertisement
9 Installation
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.
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, 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:
Installer reference guide
38
Then...
(a)
Only use propylene glycol
You can use either propylene
(a)
glycol
or ethylene glycol
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.
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.
b3
c
b4
c
b3
b4
Description
b3
b4
EJHA04AAV3 + NHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P556861-1A – 2019.05
Advertisement
Table of Contents
