11.
11.
Other features & performance information
With the compressor placed in environments of low external airflow, such as behind transverse
mounted engines, adequate charge rates must be maintained to ensure adequate compressor
cooling by the refrigerant.
Restricted TX Valves/Orifice Tubes:
Will give the same conditions as above.
Inoperable or partially blocked valves/tubes may provide adequate flow under moderate heat load
conditions, but will starve the compressor under high heat load conditions when pump cooling is
most critical.
Poor condensing:
In addition to excessive pressure generation, poor condensing will result in vapour feed to the TX
Valve/Orifice Tube, causing excessive evaporator superheating under high heat loads.
Undersized suction line:
Creates inadequate flow of refrigerant back to the compressor and valuable cooling is not given
to the compressor under high heat load conditions. This can be diagnosed by determining if a
pressure drop is evident in the line. (Refer to section 7 for correct pipe size selection)
Contaminated refrigerants:
May result in loss of compressor cooling, particularly if air or other non condensables, such as
nitrogen, are present in the refrigerant stream.
Note: Excessive discharge line temperatures may be due to either excessive vapour superheating
(as described above) or to excessive discharge line pressures. Refer to the Unicla Service Manual for
further information to assist in diagnosis and rectification if required.
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