Daikin EWAA0 DAV3P Series Installer's Reference Manual page 66

8 | Piping installation
Installer reference guide
66
Installation
height
(a)
difference
≤7 m No pre-pressure adjustment is
required.
>7 m Do the following:
▪ Increase the pre-pressure
according to the required
installation
difference. The pre-pressure
should increase by 0.1 bar
for each metre above 7 m.
▪ Check if the water volume
does
maximum
volume.
(a)
This is the height difference (m) between the highest point of the water circuit and the
outdoor unit. If the outdoor unit is at the highest point of the installation, the installation
height is 0 m.
(b)
The maximum water volume is 200 l in case the circuit is only filled with water, and 120 l in
case the circuit is filled with water and glycol.
Minimum flow rate
Check that the minimum flow rate (required during defrost/backup heater
operation (if applicable)) in the installation is guaranteed in all conditions.
If operation is...
Cooling
Heating/defrost when outdoor
temperature is above –5°C
Heating/defrost when outdoor
temperature is below –5°C
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.
Water volume
(b)
≤200/120 l
Do the following:
▪
▪
The expansion vessel of the
outdoor unit is too small for
the installation. In this case, it
is recommended to install an
height
extra vessel outside the unit.
NOT exceed the
allowed water
Then the minimum required flow rate
(b)
>200/120 l
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
maximum allowed water
volume.
is...
20 l/min
22 l/min
EWAA011~016DA + EWYA009~016DA
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P620242-1 – 2020.06
the