EWLP012~065KBW1N
Condenserless water-cooled water chillers
4PW61665-1 – 07.2010
Installation manual
5
C
HECKING
THE
WATER
CIRCUIT
The units are equipped with a water inlet and water outlet for connec-
tion to a chilled water circuit. This circuit must be provided by a
licensed technician and must comply with all relevant European and
national regulations.
Before continuing the installation of the unit, check the following
points:
■
Additional components not delivered with the unit
1
A circulation pump must be provided in such a way that it
discharges the water directly into the heat exchanger.
2
Drain taps must be provided at all low points of the system to
permit complete drainage of the circuit during maintenance or in
case of shut down.
3
Vibration eliminators in all water piping connected to the chiller
are recommended to avoid straining the piping and transmitting
vibration and noise.
■
Additional water piping delivered with the unit
All additional water piping must be installed on the system according
to the piping diagram as mentioned in the operation manual. The
flowswitch must be connected as described on the wiring diagram.
See also chapter
4
A flowswitch must be installed in the water outlet pipe of the
evaporator to prevent the unit from operating at a water flow
which is too low.
A terminal (X65A) is provided in the switch box for the electrical
connection of the flowswitch (S10L).
5
Shut-off valves must be installed at the unit so that normal
servicing of the water filter can be accomplished without
draining the complete system.
6
Air purge valves must be provided at all high points of the
system. The vents should be located at points which are easily
accessible for servicing.
7
The water filter must be installed in front of the unit for removing
dirt from the water to prevent damage to the unit or blockage of the
evaporator. The water filter must be cleaned on a regular base.
W
ATER
QUALITY
SPECIFICATIONS
A = corrosion
B = scale
C
ONNECTING
THE
WATER
CIRCUIT
The evaporator is provided with GAS female pipe thread connections
for the water inlet and outlet (refer to the outlook diagram).
Evaporator water connections are to be made in accordance with the
outlook diagram, respecting the water in- and outlet.
If air, moisture or dust gets in the water circuit, problems may occur.
Therefore, always take into account the following when connecting
the water circuit:
1.
Use clean pipes only.
2.
Hold the pipe end downwards when removing burrs.
3.
Cover the pipe end when inserting it through a wall so that no dust
and dirt enter.
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.
2x Ball valve
1x Water filter
1x Air purge
1x T-joint for air purge
2x Flowswitch pipe
1x Flowswitch
+
1x T-joint
It is very important to install the flowswitch as shown in the
figure. Observe the position of the flowswitch in relation to
the direction of the water flow. If the flowswitch is mounted
in an other position, the unit is not protected properly
against freezing.
evaporator water
circulating
water
supply water
tendency if
out of
criteria
[<20°C]
Items to be controlled
pH
at 25°C
6.8~8.0
6.8~8.0
A + B
Electrical
conductivity
[mS/m]
at 25°C
<40
<30
A + B
Chloride ion
[mg Cl
–
/l]
<50
<50
A
Sulfate ion
[mg SO
4
2–
/l]
<50
<50
A
M-alkalinity (pH 4.8)
[mg CaCO
3
/l]
<50
<50
B
Total hardness
[mg CaCO
3
/l]
<70
<70
B
Calcium hardness
[mg CaCO
3
/l]
<50
<50
B
Silica ion
[mg SiO
2
/l]
<30
<30
B
Items to be referred to
Iron
[mg Fe/l]
<1.0
<0.3
A + B
Copper
[mg Cu/l]
<1.0
<0.1
A
Sulfide ion
[mg S
2–
/l]
not detectable
A
Ammonium ion
[mg NH
4
+
/l]
<1.0
<0.1
A
Remaining chloride
[mg Cl/l]
<0.3
<0.3
A
Free carbide
[mg CO
2
/l]
<4.0
<4.0
A
Stability index
—
—
A + B
■
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.
■
The exterior of the water pipes must be adequately
protected against corrosion.
4PW61665-1_digital_EN.book Page 5 Friday, August 27, 2010 2:13 PM
