INSTALLATION MANUAL
Refrigeration unit
Zero Z120b
rev.01
3.14.1 Adjusting the CPR valve
To regulate the CPR valve, operate as follows:
• Turn on the unit in road mode.
• Connect low pressure gauge to suction line by LP service port.
• Start heat or defrost mode.
• Run compressor at High Speed
• Remove protective lid (1) unscrewing it by hand.
• Remove the inner locking nut with an 8mm Allen key.
• Regulate maximum suction pressure to 2, 2 barg (31.9psig) by turning CPR setting screw; 1 turn
clockwise to increase pressure value of 0.17bar (2.5psi) or in the opposite direction to decrease it
of same quantity.
Inside, under protection lid, remove the locking nut to operate the regulating screw.
Figure 43 - CPR adjustment valve
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