10
Temperature Criteria
Ambient temperature
The compressors have been designed to operate in the following ambient temperatures (with forced
air cooling).
Comment:
For air conditioning applications operating in high ambient conditions, see our tropical range. These
products use R-134a and have an evaporating temperature range of –10°C to +30°C, and a condensing
temperature range of +30°C to +80°C for a temperature of 55°C.
Discharge temperature
The maximum discharge temperature is 127°C. This temperature can be measured by soldering a
thermocouple onto the discharge pipe 5 cm from the compressor and insulating it for 10 cm.
Motor temperature
All our single phase rotary compressors are supplied with an external overload protector. The maximum
permitted operating temperature is 130°C which is measured by the resistance variation method.
Resistance variation method: Leave the application switched off in a constant temperature
(temperature t
1
) for at least 8 hours. Measure the motor winding resistance R
1
at this temperature t
1
.
With three phase motors, measure the resistance between 2 electrical supply terminals to the compressor.
Run the application in the most difficult conditions foreseeable, switch off the machine and immediately
measure the new motor winding resistance (R
2
). With three phase motors, measure the resistance
between the 2 terminals used before.
The new temperature t
2
can easily be calculated using the following equation:
t
1
& t
2
are given in degrees Celsius.
Return gas temperature
A minimum superheat of 10K is necessary between the evaporating temperature and suction temperature
at the inlet of the compressor. However, it is necessary to control superheat to prevent exceeding the
maximum return gas temperature for the compressor and the compressor motor (see sections 3.2 and 3.3).
3
3.1
3.2
3.3
3.4
Air Conditioning
or Heat Pump
AMBIENT TEMPERATURE
46°C
43°C
Commercial Refrigeration
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