Expansion Valve; Expansion Valve Adjustment - Zanotti Zero Series Installation Manual

Refrigeration unit
Series Zero Direct-Drive
Z200 | Z250 | Z350 | Z380
Z380 Multi

3.17 Expansion valve

The thermostatic expansion valve regulates the injection of refrigerant
into the evaporators.

3.17.1 Expansion valve adjustment.

To regulate the expansion valve, operate as follows:
Connect a pressure gauge to the evaporator output line
•
Operate the unit in cold mode
•
Measure the temperature near the valve probe
•
Turn clockwise to increase the overheating, or anticlockwise to decrease it.
•
CAUTION
If overheating in the evaporator is too high, this may be due to low supply of liquid
refrigerant, therefore a low charge of refrigerant.
NOTE
For the default value, turn 3 turns clockwise from the closed position.
rev.01
INSTALLATION MANUAL
Figure 71 - Pressure and temperature measurement
65