8 | Piping installation
Installer reference guide
65
EWAA011~016DA + EWYA009~016DA
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P620242-1 – 2020.06
INFORMATION
In critical processes, or in rooms with a high heat load, extra water might be
required.
NOTICE
When circulation in each space heating/cooling loop is controlled by remotely
controlled valves, it is important that the minimum water volume is guaranteed,
even if all of the valves are closed.
a User interface (delivered as accessory)
b Individual room thermostat (option)
c Overpressure bypass valve (field supply)
d Shut-off valve (delivered as accessory)
M1...3 Individual motorised valve to control each loop (field supply)
Maximum water volume
NOTICE
The maximum water volume depends on whether glycol is added to the water
circuit. For more information on the addition of glycol, refer to "To protect the water
circuit against freezing"[470].
Use the following graph to determine the maximum water volume for the
calculated pre-pressure.
20
2.4
2.1
1.8
1.5
1.2
0.9
1
0.6
0.3
70 120 170
200
220 270
290
320
A
B
A Pre-pressure (bar)
B Maximum water volume (l)
Water
Water + glycol
Example: Maximum water volume and expansion vessel pre-pressure
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