Zanotti un0 010, Workshop Manual

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43
3.2 Operations
Cooling Circuit
Individual Protection Devices
Goggles
Gloves
(a)
Access from unit cover door.
(b)
Open all unit valves (shut-off and solenoid ones).
(c)
Connect refrigeration mani- fold
to
LP and HPL .
CAUTION
!
More connection
points should reduce vacuum time
and increase vacuum quality.
(d)
Recover refrigerant.
RECYCLABLE Waste according local
dispositions.
(e)
Connect vacuum pump and start vacuum.
CAUTION
!
Ensure that all solenoid and shut-off valves are opened.
(f)
Wait that pressure decrease reaching a medium vacuum value of 0.65mBar, 500 MICRON , 66Pa or 0.0094psi inside
cooling circuit.
CAUTION
!
Usually a good vacuum requires 8 hours.
(g)
Close vacuum pump valve.
(h)
After evacuating end, observe a waiting time of some hours to check vacuum pressure.
a. In case of pressure rising, start Leak Search Procedure 3.2.5.2
b. In case of constant pressure, start refrigerant Charge
3.2.4
Refrigerant Charge
Individual Protection Devices
Goggles
Gloves