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DIFFERENTIAL MAGNETO-THERMAL SWITCH
Device that protects the machine from overloads, short circuits, and indirect contacts.
7.2 WHT Optional Features
HOUSING RESISTANCE
It heats the housing of the compressor before its start-up and keeps it warm during stoppage. The heat produced by the resistance
triggers the evaporation of any potential refrigerant in its liquid state found inside the compressor.
LOW PRESSURE SWITCH
It intervenes, stopping the machine, when the pressure in the suction circuit falls below the value at which it is calibrated, minus
the differential. This occurs as a consequence of a malfunction.
CONDENSER FAN SPEED VARIATOR
It adjusts the speed of the condenser fan in function of the condensation pressure, to the end of keeping it within the established
limits. It is connected to the high pressure circuit. The instructions for its use are attached to the documentation of the machine.
DIFFERENTIAL MAGNETO-THERMAL SWITCH
Device that protects the machine from overloads, short circuits, and indirect contacts.
DIFFERENT VOLTAGE
The last number in the initials of the model of the machine identifies the voltage, in accordance to the following outline:
8
.
S
e
a
r
c
h
f
o
r
8
.
S
e
a
r
c
h
f
o
r
The compressor does not start up and does not release a humming
A
sound
1
Lack of voltage. Start-up relay with open contacts.
2
Thermal protector is intervening.
3
Loose electrical connections or wrong electrical
connections.
The compressor does not start up (but releases a humming sound)
B
and the thermal protector intervenes
1
Wrong electrical connections.
2
Low voltage supply to the compressor.
3
Faulty start-up of the condenser.
4
The relay doesn't close.
5
The winding on the electrical motor is interrupted or in short
circuit.
The compressor starts up, but the relay doesn't open
C
1
Wrong electrical connections.
2
Low voltage supply to the compressor.
3
Relay blocked in closure.
1
2
3
4
5
6
8
1
2
3
4
5
6
8
M
a
l
f
u
n
c
t
i
o
n
s
M
a
l
f
u
n
c
t
i
o
n
s
POSSIBLE CAUSES
230/1/50 Hz
400/3/50 Hz
110/1/60 Hz
220/3/60 Hz
220/1/60 Hz
460/3/60 Hz
230/3/50 Hz
230/1/50 Hz
400/3/50 Hz
110/1/60 Hz
220/3/60 Hz
220/1/60 Hz
460/3/60 Hz
230/3/50 Hz
SOLUTIONS
1
Check the supply line or substitute the relay.
2
Check the electrical connections.
3
Tighten the connections or carry them out
again in compliance to the electrical wiring
diagram.
1
Re-do the connections.
2
Identify the cause and eliminate it.
3
Identify the cause and replace the condenser.
4
Identify the cause and substitute the relay if
necessary.
5
Substitute the compressor.
1
Check the electrical circuit.
2
Identify the cause and eliminate it.
3
Identify the cause and eliminate it.
WSH-WTH Pag. 54
REV. 01 04/14
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