EWWP014~065KAW1N
Packaged water-cooled water chillers
4PW30038-1
Installation manual
3
1
The 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).
2
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.
3
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.
4
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 or condenser. 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 and condenser are foreseen of GAS male pipe thread
for the water inlet and outlet (refer to the outlook diagram). Evaporator
and condenser 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.
W
ATER
CHARGE
,
FLOW
AND
QUALITY
To assure proper operation of the unit a minimum water volume is
required in the system and the water flow through the evaporator
must be within the operation range as specified in the table below.
P
IPING
INSULATION
The complete water circuit, inclusive all piping, must be insulated to
prevent condensation and reduction of the cooling capacity.
Protect the water piping against water freezing during winter period
(e.g. by using a glycol solution or heatertape).
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
condenser water
circulating
water
supply
water
circulating
water
supply
water
tendency
if out of
criteria
[<20°C]
[20°C~60°C]
Items to be controlled
pH
at 25°C
6.8~8.0
6.8~8.0
7.0~8.0
7.0~8.0
A + B
Electrical
conductivity
[mS/m]
at 25°C
<40
<30
<30
<30
A + B
Chloride ion
[mg Cl
–
/l]
<50
<50
<50
<50
A
Sulfate ion
[mg SO
4
2–
/l]
<50
<50
<50
<50
A
M-alkalinity
(pH 4.8)
[mg CaCO
3
/l]
<50
<50
<50
<50
B
Total hardness
[mg CaCO
3
/l]
<70
<70
<70
<70
B
Calcium
hardness
[mg CaCO
3
/l]
<50
<50
<50
<50
B
Silica ion
[mg SiO
2
/l]
<30
<30
<30
<30
B
Items to be referred to
Iron
[mg Fe/l]
<1.0
<0.3
<1.0
<0.3
A + B
Copper
[mg Cu/l]
<1.0
<0.1
<1.0
<0.1
A
Sulfide ion
[mg S
2–
/l]
not detectable
A
Ammonium ion
[mg NH
4
+
/l]
<1.0
<0.1
<0.3
<0.1
A
Remaining
chloride
[mg Cl/l]
<0.3
<0.3
<0.25
<0.3
A
Free carbide
[mg CO
2
/l]
<4.0
<4.0
<0.4
<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.
Minimum
water volume (l)
Minimum
water flow
Maximum
water flow
EWWP014
62
19 l/min
75 l/min
EWWP022
103
31 l/min
123 l/min
EWWP028
134
40 l/min
161 l/min
EWWP035
155
47 l/min
186 l/min
EWWP045
205
62 l/min
247 l/min
EWWP055
268
80 l/min
321 l/min
EWWP065
311
93 l/min
373 l/min
The water pressure should not exceed the maximum work-
ing pressure of 10 bar.
NOTE
Provide adequate safeguards in the water circuit to
make sure that the water pressure will never exceed
the maximum allowable working pressure.
