Zanotti un0 010, Workshop Manual

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62
Cooling Circuit
3.6 CPR Crankcase Pressure
Regulation Valve
3.6 CPR Crankcase Pressure Regulation Valve
CPR Crankcase Pressure Regulation Valve is a protection device, which avoids compressor overload and liquid return, limiting
maximum suction pressure. It is useful at the end and during defrost or heating operations, under certain conditions, and also
at start with equilibrated circuit (e.g. after a long stop).
1)
Protective cap.
2)
Setting Screw.
3)
Main Spring.
4)
Stainless steel equalisation
bellows.
5)
Throttling assembly with
variable dampening brake.
Individual Protection Devices
Goggles, Gloves, Vest
CPR Regulating Procedure
(a)
Turn on-unit in road mode.
(b)
Connect low pressure gauge to
suction line by LP service port.
(c)
Start heat or defrost mode.
(d)
Run compressor at High Speed
(e)
Remove CPR cap (pos. 1)
unscrewing by hands.
(f)
Remove CPR inner locking nut
(8mm Allen key).