Flooded type water cooled screw chiller (PCB Control)
92
(3) Inspect whether there is alarm for trouble of the display screen. if there is, the trouble must be
corrected.
(4) Inspect the electronic expansion valve control module for alarm trouble.
(5) Inspect whether various temperature points displayed on the display screen are within the normal
range.
Before the operation of the unit, the showed temperatures of discharge and fin and the ambient
temperature are close to the current actual ambient temperature, and whether the entering and leaving
water temperatures are close to the water temperature at the user side. If there is any obvious deviation
of the above temperatures, inspect whether the temperature sensor is in normal condition and whether
the connection is firm and reliable.
(6) Inspect whether the flow in the water pump meets the requirements of the unit.
(7) Inspect whether the power supply of the unit is stable.
2) Parameters Inspections during Start-up and Operation
(1) The maximum range of parameters for normal operation of R134a refrigerant unit
See table 2 for the maximum range of performance parameters of R134a refrigerant:
[Table 2]
(2)Keep good record of unit data during commissioning.
Working Condition
Refrigeration
Discharge temp.
℃
40~50
℃
Suction temp.
℃
5~9
℃
Suction super-heating degree
℃
1~3
℃
Discharge super-heating degree
℃
10~15
℃
Discharge pressure MPa
0.8~0.9MPa
Suction pressure MPa
0.2~0.25MPa
Values of various
temperature
and
pressure
points
showed in the main
page of the unit.
Compressor oil
heater begins to
work when the
unit is electrified.
