Description of functions
5. Control section
The ON/OFF SWITCH is the switch for mains
power supply to the compressor. Mains
power is connected to the mains power
fuses in the 3.11 ELECTRICAL INTER-
CONNECTION terminal and then routed, via
internal cabling, to the on/off switch.
Operating time meter
The OPERATING TIME METER shows the
cumulative total of the number of hours that
the Compressor Compact has been in
operation. The range of the meter is 1/100 of
an hour up to 10,000 hours and it cannot be
reset to zero.
Electrical control functions
The ELECTRICAL CONTROL FUNCTIONS
are located on a PC board in the control
section. This PC board controls the:
• Temperature alarm and pressure alarm
• Timing circuits for the solenoid valves 1
and 2 including RL2
• Standby functions including RL1 and RL3.
The test button, the indicator lamps and the
buzzer are mounted on this PC board.
The purpose of the TEST BUTTON is to
make it possible to check the alarm indicator
lamps and the audible alarm.
When this button is held depressed, the
indicator lamps for temperature alarm and
pressure alarm will light up. The audible
alarm buzzer will also be activated.
Mains power lamp
The green MAINS POWER LAMP is supplied
from the 12 V DC circuit. This means that the
mains power lamp indicates that mains
power as well as 12 V power is on.
Temperature alarm lamp
The temperature alarm is activated if the air
temperature at the 1.3 TEMPERATURE
SENSOR exceeds 70°C ±3°C (158°F ±5°F).
This alarm is indicated by the red TEMPE-
RATURE ALARM LAMP and the ALARM
The alarm lamp will stay on until the alarm is
The temperature alarm is deactivated at a
temperature below 55°C ±6°C (131°F ±11°F).
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