Zanotti un0 060, Workshop Manual

Page: 61 / 248

50
Cooling Circuit
3.3 Valves
Valve Test
(a)
Spray foam detection solution
on service port.
(b)
Check for foam or bubbles
presence.
CAUTION
!
Test gives better
re- sults with more than 10bar
(145psi) difference between line and
external pressure.
(c)
Inspect with electronic nose.
Valve Replacement
(a)
Recover Refrigerant 3.2.2
Section.
(b)
Unscrew valve (pos. 3) from
service port (pos. 2).
(c)
Screw new valve on service port.
CAUTION
!
Lubricate valve
gaskets with POE32 oil before
installation.
(d)
Vacuum unit 3.2.3 Section.
(e)
Respect a waiting time and check for leaks 3.2.5 Section.
(f)
Charge refrigerant 3.2.4 Section.