Daikin EWYA004D2V3P Installer's Reference Manual page 63

EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09
A
2,4
2,1
1,8
1,5
1,2
1
0,9
0,6
0,3
20 70
A Pre-pressure (bar)
B Maximum water volume (l)
Water
Water + glycol
Example: Maximum water volume and expansion vessel pre-pressure
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 185 l in case the circuit is only filled with water, and 105 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
120 170 220
105 150 185
Water volume
(b)
≤185/105 l
height
NOT exceed the
allowed water
Then the minimum required flow rate
8 Piping installation
|
270
B
(b)
>185/105 l
Do the following:
▪ Decrease the pre-pressure
according to the required
installation
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
volume.
The expansion vessel of the
outdoor unit is too small for
the installation. In this case, it
is recommended to install an
extra vessel outside the unit.
is...
10 l/min
6 l/min
Installer reference guide
height
the
water
63