Daikin Altherma 3 H HT F Series, Installation Manual

4 Piping installation

Installation manual

8

ETVH/9W(G)

Daikin Altherma 3 H HT F

4P586454-1 – 2019.07

3

Route the recirculation piping through the grommet and connect
it to the recirculation connector.

4

Reattach the top panel.

4.2.3

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.

4.2.4

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  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.

Add glycol according to the table below.

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%

—

–30°C

35%

—

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.