In which Refrigeration systems can I use Electronic expansion valves?

Pulsating electronic expansion valves can be used on following systems:

Refrigeration system Single Evaporator Multiple Evaporators
Conveni Pack No Yes
Single Zeas unit No Yes
Multi Zeas units No Yes
Booster unit (with Zeas or Conveni Pack) No Yes

 

Proportional electronic expansion valves can be used on following systems:

Refrigeration system Single Evaporator Multiple Evaporators
Conveni Pack Yes, with condition* Yes
Single Zeas unit Yes, with condition* Yes
Multi Zeas units Yes, with condition* Yes
Booster unit (with Zeas or Conveni Pack) Yes, with condition* Yes

* For Single Evaporator systems, Proportional type of expansion valves are allowed if the time between fully open to fully closed is less than 5 s!