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Oil-free Air Division Instruction book
On air-cooled dryers, fan control switch (S3-Fig. 4b) will start
fan motor (M2-Figs. 4) 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 (S2-Fig. 4b) stops the
compressor motor when the pressure in the refrigerant circuit
reaches the upper set point of the switch. The compressor motor
will automatically restart when the pressure drops to the lower
set point.
The motors have a built-in thermic protection. If the compressor
motor stops without apparent reason, it will most 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.
An electronic thermostat with display and alarm functions is
installed on the instrument panel (Fig. 10). Display (3-Fig. 11)
shows the pressure dewpoint temperature. The set point value,
i.e. the pressure dewpoint temperature at which the alarm
indicator lamp (H3-Fig. 10) lights up, can be checked by
pressing key (5-Fig. 11); the value will blink for 5 seconds on
the display. The differential value (∆t), i.e. the temperature
difference between alarm on and alarm off, can be checked by
pressing key (4-Fig. 11); the value will blink on the display for
approx. 5 seconds.
Altering the set point value (indicated "L1"):
- Press key (5); the current value blinks on the display.
- Press the up (1) or down (2) key until the desired value is
reached.
- To store the new value, press key (5) or wait a few seconds.
Fig. 4a. Side view of FD950
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