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CHECK PARAMETERS
NOTE
(1) = version Y
161
THERMOMAGNETIC
SWITCHES FANS
16.2
THERMOMAGNETIC
SWITCHES COMPRESSORS
16.3
TRANSDUCERS
PRESSURE SWITCHES
KEY
PA
High pressure switch
PB
Low pressure switch
TRA
High pressure transducer
TRB
Low pressure transducer
All units are thoroughly tested in the
factory before shipping. Nonetheless,
it is always good practice to check all
control and safety systems after a
reasonable period of operation.
All the control operations must be
carried out by qualified personnel; the
wrong settings on the above devices
can cause serious damage to the unit.
16.3. 1 High pressure switch
The high pressure switch stops the
compressor (generating the relative
alarm) when the delivery pressure
exceeds the set value.
The control of its correct working can
be made by closing the air suction
on the exchanger (in cold mode) and,
keeping the high pressure gauge under
control, checking it intervenes upon
reaching the calibrated value.
28
CALIBRATION OF CHECK AND SAFETY
16
PARAMETERS
Cooling set point
Heating set point
Antifreeze intervention
Total differential
Autostart
0800
0900
n° Ventilatori
MTV 1
17 A
17 A
MTV 2
17 A
17 A
MTV 3
/
/
MTV 4
/
/
0800
0900
MTC1
53 A
57 A
MTC1A
53 A
57 A
MTC1B
53 A
57 A
MTC2
57 A
57 A
MTC2A
57 A
57 A
MTC2B
57 A
57 A
MTC3
/
/
MTC3A
/
/
MTC3B
/
/
MTC4
/
/
MTC4A
/
/
MTC4B
/
/
0800
PA cold
27
PA hot
H
27
PB
HL
2
TRA
27
TRB
1
WARNING
If the switch does not trip at the
calibrated value, stop the compressor
immediately and identify the cause.
Reset is manual and only enabled
once the pressure drops below the
differential value. (For the set and
differential values, see the technical
manual).
16.3.2 Low pressure switch
The low pressure switch stops the
compressor (generating the relative
alarm) when the suction pressure
drops below the set value. The control
of its correct working can be made
(after about 5 minutes of operation) by
slowly closing the tap on the liquid pipe
and, keeping the low pressure gauge
under control, checking it intervenes
upon reaching the calibrated value.
min.
standard
4 / -6 (1)
7 / -6 (1)
°C
°C
35
48
-9
3
°C
3
5
°C
1000
1250
1400
9 A
9 A
13 A
9 A
9 A
13 A
9 A
13 A
13 A
9 A
13 A
13 A
1000
1250
1400
53 A
53 A
57 A
53 A
53 A
57 A
/
/
/
53 A
53 A
57 A
53 A
53 A
57 A
/
/
/
53 A
57 A
57 A
53 A
57 A
57 A
/
/
/
53 A
57 A
57 A
53 A
57 A
57 A
/
/
/
0900
1000
1250
1400
27
27
27
27
27
27
27
27
2
2
2
2
27
27
27
27
1
1
1
1
WARNING
If the switch does not trip at the
calibrated value, stop the compressor
immediately and identify the cause.
Reset is manual and only enabled
once the pressure rises above the
differential value. (For the set and
differential values, see the technical
manual).
16. 1 .3 Anti-freeze control
The anti-freeze control, managed by
electronic regulation and by
the temperature probe at the
evaporator outlet, has the job
of preventing the formation of
ice when the water flow rate
is too low. The control of its
correct working can be made
by gradually increasing the anti-
freeze set until it exceeds the
max.
14
50
4
10
auto
1500
1650
1800
13 A
13 A
17 A
13 A
13 A
17 A
13 A
13 A
17 A
13 A
13 A
17 A
1500
1650
1800
57 A
53 A
53 A
57 A
53 A
53 A
/
53 A
53 A
53 A
53 A
57 A
53 A
53 A
57 A
53 A
53 A
57 A
57 A
53 A
53 A
57 A
53 A
53 A
/
53 A
53 A
53 A
53 A
57 A
53 A
53 A
57 A
53 A
53 A
57 A
1500
1650
1800
27
27
27
27
27
27
2
2
2
27
27
27
1
1
1
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