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1.1
General safety references
Use of the compressor protection device in combination with refrigerants classified as A3 (e.g. propane) and A2:
DANGER
Risk of explosion!
The supplied compressor protection device can ignite the refrigerant.
Mount the compressor protection device outside the hazardous zone, for example in a gas-tight switch cab-
inet.
WARNING
Risk of electric shock!
Before performing any work in the terminal box: Switch off the main switch and secure it against being
switched on again!
Close the terminal box before switching on again!
NOTICE
!
!
Compressor protection device may fail after too high voltage has been applied. Possible subsequent fault:
compressor failure.
The cables and terminals of the temperature control circuit must not come into contact with the control
voltage or operating voltage!
Mind label in terminal box cover. Observe the notes.
For work on the compressor once it has been commissioned
WARNING
The compressor is under pressure!
Serious injuries are possible.
Depressurise the compressor!
Wear safety goggles!
CAUTION
Surface temperatures of more than 60°C or below 0°C.
Risk of burns or frostbite.
Close off accessible areas and mark them.
Before performing any work on the compressor: switch it off and let it cool down or warm up.
2
Basic functions and terms
The standard scope of delivery of a BITZER compressor includes a compressor protection device, which is either
pre-installed in the compressor's terminal box or has to be installed externally, e.g. in the system's switch cabinet.
Electrical safety of the compressor according to EN12693 is ensured with all compressor protection devices as-
signed from BITZER. Any other electrical protection must be evaluated by the user for each individual case.
2.1
Temperature monitoring
Motor winding temperature, discharge gas temperature or oil temperature are monitored by PTC resistors. The
compressor protection device locks out immediately when the resistor in the temperature control circuit exceeds a
specified value.
• 3 or 6 PTC resistors are generally installed in the motor winding. According to DIN 44081/82 it is possible to use
up to 9 series-connected PTC.
CT-120-2 // PDF Download
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