Zanotti un0 010, Workshop Manual

Page: 76 / 248

65
3.6 CPR Crankcase Pressure
Regulation Valve
Cooling Circuit
(i)
i Clean pipe ends with a special
brush and flow with dry nitrogen.
CAUTION
!
Never flow with
normal air, it contains too much
humidity.
(j)
Braze new CPR valve in position.
CAUTION
!
Wrap CPR valve in a
wet rag, which must be warmer than
ambient avoiding moisture
condensation.
(k)
Reinstall evaporator service ports
valves.
(s)
CAUTION
!
Lubricate valve
gaskets before.
(l)
Vacuum contaminated part of cooling circuit from LP service port.
(m)
Test installation for leaks with a vacuum gauge.
(n)
Reinstall valve support brackets.
(o)
Charge unit with refrigerant 3.2.4 Section.
Regulate CPR valve 3.6.1 Section.