Handleiding
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Installation and operation manual
11
EWAQ016~064BAW + EWYQ016~064BAW
Packaged air-cooled water chiller
4PW70082-1E – 2016.12
figure "Maximum allowed water volume"
The default value of pre-pressure (Pg) responds to 7 m height
difference.
If the height difference of the system is lower than 7 m AND the
volume in the system is less than the maximum allowed value at
that pre-pressure (Pg) (see chart above), then NO pre-pressure
(Pg) adjustment is required.
Example 1
The unit is installed 5 m below the highest point in the water
circuit. The total water volume in the water circuit is 250 l.
In this example, no action or adjustment is required.
Example 2
The unit is installed at the highest point in the water circuit. The
total water volume in the water circuit (no glycol used) is 420 l.
Result:
Since 420 l is higher than 340 l, the pre-pressure must be
decreased (see table above).
The required pre-pressure is:
Pg=(H/10+0.3) bar=(0/10+0.3) bar=0.3 bar
The corresponding maximum water volume can be read from
the graph: approximately 490 l.
Since the total water volume (420 l) is below the maximum
water volume (490 l), the expansion vessel suffices for the
installation.
4 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 an installer.
8.9.3. Connecting the water pipes
Water connections must be made in accordance with all applicable
legislations and the outlook 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.
Make sure to provide a proper drain for the pressure relief valve.
Because brass is a soft material,
use appropriate tooling for
connecting the water circuit.
Inappropriate tooling will cause
damage to the pipes.
For correct operation of the
system, a regulating valve must
be installed in the water system.
The regulating valve is to be used to regulate the water flow in
the system (field supply).
8.9.4. Installing the shut-off valve kit
Refer to figure 10.
1 Adapter piece
2 Shut-off valve
8.9.5. Insulating the water pipes
The complete water circuit, inclusive all piping, must be insulated to
prevent condensation during cooling operation and reduction of the
heating and cooling capacity as well as prevention of freezing of the
outside water piping during winter time. The thickness of the sealing
materials must be at least 13 mm with λ=0.039 W/mK in order to
prevent freezing of the outside water piping at ambient temperature
of –15°C.
If the temperature is higher than 30°C and the humidity is higher than
RH 80%, then the thickness of the sealing materials should be at
least 20 mm in order to avoid condensation on the surface of the
sealing.
pre-pressure = pre-pressure
maximum volume = maximum volume (water or water + glycol)
A = System without glycol
B System with 30% ethylene glycol
C System with 40% ethylene glycol
D System with 30% propylene glycol
E = System with 40% propylene glycol
F =Default
(Refer to Caution: "Use of glycol" on page 12)
0
0,5
1
1,5
2
2,5
3
0 50 100 150 200 250 300 350 400 450 500 550 60
0
Maximum volume [l]
Pre-pressure [bar]
A
B
F
C
D
E
33
NOTICE
Be careful not to deform the unit piping by using excessive
force when connecting the piping.
NOTICE
The unit is only to be used in a closed water system.
Application in an open water circuit can lead to
excessive corrosion of the water piping.
Never use Zn-coated parts in the water circuit.
Excessive corrosion of these parts may occur as
copper piping is used in the unit's internal water
circuit.
4PWEN70082-1E_2016_12.book Page 11 Wednesday, December 7, 2016 2:18 PM
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Productinformatie
| Merk | Daikin |
| Model | EWYQ-BAWN |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 9272 MB |
