Daikin EWYQ007AAV3P [8/20] Connecting the water circuit
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Daikin EWYQ007AAV3P [8/20] Connecting the water circuit

Daikin EWYQ007AAV3P [8/20] Connecting the water circuit
Installation manual
6
EWAQ+EWYQ005~007AAV3P
Packaged air-cooled water chillers and
packaged reversible air to water heat pumps
4PW27339-1D
Checking the maximum allowed water volume
To determine the maximum allowed water volume in the entire circuit,
proceed as follows:
1 Determine for the calculated pre-pressure (Pg) the
corresponding maximum water volume using the graph below.
2 Check that the total water volume in the entire water circuit is
lower than this value.
If this is not the case, the expansion vessel inside the unit is too small
for the installation.
Example 1
A heat pump model unit is installed 5 m below the highest point in the
water circuit. The total water volume in the water circuit is 100 l
In this example, no action or adjustment is required.
Example 2
A heat pump model unit is installed 4 m below the highest point in the
water circuit. The total water volume in the water circuit is 190 l.
Result:
■ Since 190 l is higher than 170 l, the pre-pressure must be
decreased (see table above).
■ The required pre-pressure is:
Pg = (H/10 + 0.3) bar = (4/10 + 0.3) bar = 0.7 bar
■ The corresponding maximum water volume can be read from
the graph: approximately 200 l.
■ Since the total water volume (190 l) is below the maximum water
volume (200 l), the expansion vessel suffices for the installation.
Setting the pre-pressure of the expansion
vessel
When it is required to change the default pre-pressure of the
expansion vessel (1 bar), keep in mind the following guidelines:
■ Use only dry nitrogen to set the expansion vessel pre-pressure.
■ Inappropriate setting of the expansion vessel pre-pressure will
lead to malfunction of the system. Therefore, the pre-pressure
should only be adjusted by a licensed installer.
Connecting the water circuit
Water connections must be made in accordance with the installation
drawing delivered with the unit, respecting the water in- and outlet.
If dirt gets in the water circuit, problems may occur. Therefore, always
take into account the following when connecting the water circuit:
■ Use clean pipes only.
■ Hold the pipe end downwards when removing burrs.
■ Cover the pipe end when inserting it through a wall so that no
dust and dirt enter.
■ Use a good thread sealant for the sealing of the connections.
The sealing must be able to withstand the pressures and
temperatures of the system, it must also be resistant to the used
glycol in the water.
■ When using non-brass metallic piping, make sure to insulate
both materials from each other to prevent galvanic corrosion.
■ Because brass is a soft material, use appropriate tooling for
connecting the water circuit. Inappropriate tooling will cause
damage to the pipes.
= pre-pressure
= maximum water volume
0.3
0.5
1
1.5
2
2.5
10050
0
10
150 200 250 300 350 400 450
maximum water volume [l]
pre-pressure [bar]
EWAQ
EWYQ
Be careful not to deform the unit piping by using excessive
force when connecting the piping.
1 To secure the piping of the unit
2 To connect the shut-off valve
3 Water inlet
4 Water outlet
1
2
3
4

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