2920 1390 02
5
Instruction book
Fan control switch (S3) starts fan motor (M2) as soon as the
condenser pressure reaches the upper set point of the switch
and will stop the fan motor when the condenser pressure
decreases to its lower set point.
High pressure shut-down switch (S7-Fig. 1.1) stops the
compressor motor when the pressure in the refrigerant circuit
reaches the upper set point of the switch. After tripping, it
must be reset manually by pressing its reset knob.
The compressor motor has a built-in thermic protection. If the
compressor motor stops without apparent reason, it will
probably be the thermic protection which has tripped. In such
case, the compressor will restart when the motor windings have
cooled down, which may take up to 2 hours.
C1. Start capacitor
C3. Run capacitor
F0. Main fuses, local installation
(customer's installation)
H1. Indicator lamp, VOLTAGE ON
H2. Indicator lamp, DEWPOINT
ALARM (optional)
K1. Timer (optional)
M1. Compressor motor
M2. Condenser fan motor
R. Resistor
R1. Temperature sensor, dewpoint
(optional)
S0. Main switch (customer's
installation)
S1. Button, ON-OFF
S3. Fan control switch
S4. Electronic thermostat with
display (optional)
S7. High pressure shut down switch
T1. Transformer (optional)
Y1. Solenoid valve, interval drain
(optional)
Fig. 1.3 Electrical diagram of FD90 up to FD130
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