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Piping installation
Installer reference guide
72
EPRA08~W1 + ET9W
Daikin Altherma 3 H MT F
4P634887-1 – 2021.03
Installation
height
difference
(a)
Water volume
≤190 l
>190 l
≤7 m
No pre-pressure adjustment is
required.
Do the following:
▪
Decrease the pre-pressure
according to the required
installation
height
difference. The pre-pressure
should decrease by 0.1 bar
for each metre below 7 m.
▪
Check if the water volume
does
NOT
exceed
the
maximum allowed water
volume.
>7 m
Do the following:
▪
Increase the pre-pressure
according to the required
installation
height
difference. The pre-pressure
should increase by 0.1 bar
for each metre above 7 m.
▪
Check if the water volume
does
NOT
exceed
the
maximum allowed water
volume.
The expansion vessel of the
indoor unit is too small for the
installation. In this case, it is
recommended to install an
extra vessel outside the unit.
(a)
This is the height difference (m) between the highest point of the water circuit and the
indoor unit. If the indoor unit is at the highest point of the installation, the installation
height is 0 m.
Minimum flow rate
Check that the minimum flow rate in the installation is guaranteed in all conditions
on each zone separately. This minimum flow rate is required during defrost/backup
heater operation. For this purpose, use the overpressure bypass valve delivered
with the unit.
Minimum required flow rate
20 l/min
NOTICE
If glycol was added to the water circuit, and the temperature of the water circuit is
low, the flow rate will NOT be displayed on the user interface. In this case, the
minimum flow rate can be checked by way of the pump test (check that the user
interface does NOT display error 7H).
NOTICE
When circulation in each or certain space heating loops is controlled by remotely
controlled valves, it is important that the minimum flow rate is guaranteed, even if all
valves are closed. In case the minimum flow rate cannot be reached, a flow error 7H
will be generated (no heating or operation).
See the recommended procedure as described in
209].
Summary of Contents for Altherma 3 H MT F
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