Zanotti un0 010, Workshop Manual

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44
Cooling Circuit
3.2 Operations
(a)
Connect refrigeration manifold.
(b)
Vacuum unit as in 3.2.3 Section
procedure.
(c)
Charge refrigerant according
Electrical Box Sticker.
(d)
Close refrigerant manifold
gauges and test unit.
UN0060 R404A 3
,
5
kg
(7
.
7
lb
)
UN0080 R404A 3
,
5
kg
(7
.
7
lb
)
UN0100 R404A 3
,
5
kg
(7
.
7
lb
)
UN0120 R404A 4
,
4
kg
(9
.
9
lb
)
Refrigerant leaks
Leaks can affect cooling system performance with refrigerant blow out or humidity penetration and contamination. Every
sealed system leaks because flaws exist. A flaw may be too small to compromise efficiency or to be detected, but given time,
vibration, temperature and operating stress, flaws become larger, and leak may become detectable.
Leakage Test
Individual Protection Devices
Goggles
Gloves
(a)
Recover Refrigerant 3.2.2 Section.
(b)
Vacuum unit.
(c)
Observe a waiting time of some hours.
(d)
Check with a vacuum gauge if pressure is rising or if the system can be considered sealed.