Cd59 Pump Down Logic

Cd59 allows operation of the pump down logic control. The display will flash
between “STArT PdN” and “PrESS EnTEr”.
Upon entering Cd59 the operator will be required to acknowledge that they want
to initiate the pump down control. The display will flash between “STArT P dN”
and “PrESS EnTEr”. Once the decision to continue is confirmed pump down logic
will begin, and will take complete control of the unit until pump down either
succeeds or fails. This operation can not be halted once it begins without power
cycling the unit.
After pump down logic has been initiated, the operator will be notified to close the
Liquid Line Valve, the display will flash between “CLOSE LLV” and “PrESS
EnTEr”. Once complete the display will read “P dN” to the left, and the current
suction pressure to the right.
If the automatic pump down logic succeeds within 20 minutes, the unit will turn itself
off, and the display will notify the operator that pump down is complete by
flashing between “P dN DOnE” and “SHUT OFF”. The operator must then shut
off the unit.
If the automatic pump down logic does not complete within 20 minutes, the unit
will drop out of Cd59 and return to its previous control condition.