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6 --- Calibration
The water chiller has been already tested and calibrated by the manufacturer. The following setting values are suggested
in the field.
COMPONENT
Low pressure switch (LP)
High pressure switch (HP)
High pressure switch (HP)
Note 1: The second pressure switch must be set 0.5 bar lower than the indicated settings; both the pressure switches have a fixed differential equal to 4 bar.
Note 2: The value of the parameter "HP warning" to be set in the iCOM control must be 1,0 bar lower than the min. setting of the high pressure switch.
Therefore:
for the machines according to the European norms in standard version:
for the machines according to the European norms with HTD option:
The settings for the safety valves installed on the machine are indicated below:
SETTING
29 bar
17.3 bar
6.1 --- Setting thermostatic expansion valve
THIS OPERATION MUST BE PERFORMED BY AN
EXPERIENCED REFRIGERATION TECHNICIAN.
Before beginning this calibration be sure that the refriger-
ant charge is correct: this is obtained through the sub----
cooling (4- - 8°C, as specified in para. 5.1).
The valve has already been factory---set and should bere-
set (when the superheat is not between 5 and 8˚C), as fol-
lows:
1) Important:
Ensure that the instructions in par. 5.1 have been car-
ried out.
2) Allow the compressor to operate for 15 mins.
3) Measure the superheat as follows:
a) Connect a manometer to the Schraeder connection
located on the evaporator outlet tube, and read the
manometric temperature on the scale for the re-
frigerant used (for the units with R407C refer to
the pressure gauge scale indicated with the initials
D.P. = Dew Point).
b) Using a contact thermometer, measure the tem-
perature on the tube coming out of the evaporator,
next to the socket used for the manometer.
c) The superheat is the difference between the two
readings (b ---a).
4) The superheat must be 5---8
sion valve as follows:
SETTING
Operation with R407C/R22
(standard factory setting):
START
: 3.6 bar
DIFF.
: 0.8 bar
STOP
: 2.8 bar
Operation with R407C/R22
(standard factory setting):
STOP
: 24 bar
START
: 20 bar
DIFF.
: 4 bar (fixed)
Operation with R407C/R22 +
HTD (option):
STOP
: 26 bar
START
: 22 bar
DIFF.
: 4 bar (fixed)
SAFETY VALVE
o
C; if not, set the expan-
English
HP side
LP side
a) Remove the protective cover;
b) Turn the adjustment screw to return to the opti-
mum values, tightening it in a clockwise direction
to increase the superheat, or slackening it to reduce
the superheat.
c) Wait 10 minutes;
d) Measure the superheat and repeat the operation if
necessary.
N.B:
If the superheat is too low, there is a risk of poor lubrica-
tion and consequent breakage of the compressor as a re-
sult of pressure shock.
If the superheat is too high the output of the system is
limited and the compressor overheats.
6.2 --- Environment protection
A misuse or an incorrect calibration of the unit leads to in-
creased energy consumption, resulting in an economic and
environmental damage. Use the freecooling function, if
available.
NOTES
set
diff.
0.2 1.5
0.5
5
bar
bar
set
diff.
6
5
2
23
bar
bar
set
diff.
6
5
2
23
bar
bar
22.5 bar
24.5 bar
9
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