A cooler temperature switch (thermostat) is
connected to the Peltier element. The switch
detects the temperature at the cool side of
the element. To avoid formation of ice in the
thermoelectric cooler, this switch will cut the
power supply to the Peltier element if the
temperature drops below approx. +2°C
(+36°F). This thermostat is factory calibrated
and must not be adjusted.
The PC board RCD connected to the thermo-
stat is a spark arrestor. This PC board RCD
is included in the different versions of the
Compressor Compact with standby function
• 100 V/50 Hz: Serial No. 50001 or higher.
• 100 V/60 Hz: Serial No. 40001 or higher.
• 115 V/60 Hz: Serial No. 20531 or higher.
• 230 V/50 Hz: Serial No. 30530 or higher.
• 240 V/60 Hz: Serial No. 60013 or higher.
The PC board RCD must be connected with
correct polarity, refer to the Connection
Due to service interventions and recom-
mended updates, the PC board RCD can be
included also in Compressor Compact as
• Compressor Compact with standby
function with Serial No. lower than stated
in the list above. Exceptions: Units with
Serial No. 126 or lower.
• Compressor Compact 230 V/50 Hz without
standby function. Exceptions: Units with
Serial No. 469 or lower.
Note: A spark arrestor of a different design
(with components mounted onto the cables)
has been installed in the 115 V/60 Hz version
of Compressor Compact with Serial No.:
20498 – 20530. The PC board RCD must
not be installed in these units as long as the
spark arrestor with components mounted
onto the cables is installed.
E382 EH81E 061 01 03 02
Water separator 2
WATER SEPARATOR 2 is a standard
compressed air filter provided to filter the air
as well as to separate water from the air.
This water separator is connected to the
outlet of the 3.2 THERMOELECTRIC
COOLER, and it supplies compressed air to
the 4.1 COMPRESSED AIR RESERVOIR
(via the 3.6 STANDBY SOLENOID VALVE
in compressors with standby function).
Water separated from the air is collected in
the metal bowl. The water separator is
automatically drained at regular intervals by
one of the two 3.4 FILTER/SOLENOID
VALVES, and the water is collected in the
3.5 DRAINAGE BOTTLE.
Water separator 2 must be overhauled at the
8000 hour overhaul.
The two identical FILTER/SOLENOID
VALVES are designed for 12 V DC power
supply. The purpose of these valves is to
remove water collected in 3.1 WATER
SEPARATOR 1 and 3.3 WATER SEPARA-
TOR 2 at regular intervals.
The electrically controlled solenoid valves
are closed in non-activated condition. During
operation, the solenoid valves will be
activated (open) for approx. 0.5 seconds
twice every minute by the timing circuit in
5.3 ELECTRICAL CONTROL FUNCTIONS.
When the solenoid valves open, the water
collected in the water separators will be
transported to the 3.5 DRAINAGE BOTTLE
via solenoid valves.
The filter/solenoid valves must be
overhauled at the 8000 hour overhaul.
Description of functions