1-20
Dip-pipe
Liquid withdrawal
Invert cylinder
without dip-pipe
The proper refrigerant charge should follow the volume as recommended by manufacturer and recommendation should be
followed by the installer.
Charging procedures – Single phase compressors
Evacuate the system to -760mmHg. To reduce evacuation time, use short, large diameter hoses and connect to unrestricted
service ports on the system. Quality of vacuum cannot be determined by time – a reliable vacuum gauge must be used.
(etc. electronic vacuum gauge)
Turn the refrigerant cylinder upside down, purge the charging hose and charge liquid through the liquid line charging port
until refrigerant no longer
fl
ows or until the correct charge has been weighed in. If additional charge is required start the
system and slowly bleed liquid into the suction side until the system is full.
It recommends charging liquid in a CONTROLLED manner into the suction side until the system is full
.
This recommendation does not hold true for reciprocating compressors where liquid charging into the suction side could
cause severe damage.
Carefully monitor the suction and discharge pressures – ensure that the suction pressure does not fall below 25 psig (1.7 bar)
at any time during the charging process.
1.
!
CAUTION
Manifold Gauge will show cylinder pressure rather than suction pressure if the cylinder valve and Manifold
valve “A” are both open.
•
A
There are many ways of charging liquid in a “controlled manner” into the
suction side:-
Use valve A on the manifold gauge set
Use the valve on the refrigerant cylinder
Charge through a Shredder valve
Use a hose with a Shredder valve depressor
Charge into the suction side at some distance from the compressor
All of the above
1.
2.
3.
4.
5.
6.
Charging procedures – Three phase compressors
The fundamental procedure is the same as for single phase models but the compressor can run in the wrong direction on
starting.
If this happens reverse any two phases and start again. Short term reverse rotation will not damage the compressor.
All Specter compressors have internal discharge temperature protectors which are very effective in preventing dangerously
high discharge temperatures during charging. The protection module will trip and lock the compressor out for 30 minutes.
It is not normally necessary to wait 30 minutes for the module to reset. When the compressor has cooled down the module
can be reset by breaking the power supply to the control circuit. Very often the serviceman does not understand why the
module tripped and uses a jumper wire to bypass it. He continues to charge the system and removes the jumper when
charging is complete. The compressor may or may not run with the protector back in the circuit but it is certain that the
compressor has been damaged and premature failure is inevitable.
2.
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