No Refrigerant Circulation (Clogged Circuit); Air Mixed In The Circuit - Kubota KX080-3 Workshop Manual

WSM KX080-3 Service

6) No refrigerant circulation (clogged circuit)

Phenomenon
Negative pressure immediately shown
at low-pressure side if the circuit is
fully clogged. Gradual drop to negative
pressure at low-pressure side if the
circuit is partially clogged.
Temperature difference
between before and after a clogged
spot.

7) Air mixed in the circuit

Phenomenon
Too high pressure at both low-pres-
sure and high-pressure sides
Nothing cold at a touch of low-pres-
sure pipe
Bubbles appearing in the sight glass
Possible cause
Dust buildup or water freezing at the
small port of expansion valve or EPR,
which blocks the refrigerant flow.
generated
(1)
Possible cause
Air mixed in the refrigeration cycle
(1)
VI-S-16
Replace the receiver with new one
(replace the dryer and clean the
strainer). Do the complete vacuuming.
(2)
(1) Low-pressure side
(2) High-pressure side
Change the refrigerant for fresh one.
Do the complete vacuuming.
(2)
(1) Low-pressure side
(2) High-pressure side
VI Air Conditioner
Correction
Correction