65 © STULZ SpA . – all rights reserved EN/39B/06.2018
SAL
DANGER
ATTENTION: In case of main switch, the power supply cables between the connection terminals
of the customer and the main switch are always under voltage also if the main switch is open.
The supply cables are identified with the symbol below (high voltage).
11.5. Crankcase heater for compressor – CRA
This heating resistance, installed around compressor carter, operates when compressor is OFF,
to keep lubricating oil warm. This function assures constant lubricating performance of oil at the
compressor start. It's necessary only when outdoor temperature might go below -20°C.
Maintenance:
• Check every 6 months the proper operation of the crankcase heater.
11.6. Refrigerant R134a
With standard R407C the upper limit of external temperature is +50°C, while with R134a, units can
work at external temperatures up to +55°C. Since with R134a compressors have a lower efficiency
than with R407C, with this option a bigger compressor is installed to achieve roughly the same total
cooling capacity as with standard R407C refrigerant. In the following pages, the technical data
sheets of units with R134a.
INFORMATION
Refrigerant R134a is not available for SAL models A0 / A2 / A5 with 230/1/50 power supply
NOTES ON TECHNICAL DATA:
* Inclusive of power absorbed by evaporator fans. External temperature 35°C / Internal
temperature 30°C / Internal relative humidity 30%
** Sound pressure level at 2 m obtained from the measured sound power according to the EN ISO
96142 on normal condition of use and nominal operating condition.
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