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IDX-OM-Y002
Chapter 5
Checks
, Maintenance and Adjustment
5.3
Adjustment
IDF190D/240D Series
5-8
(D) Replacement of the main valve (discharge valve)
Purchase the replacement kit of the main valve and replace it referring to the attached Replacement
Procedure. Replacement requires a specific tool. Replacement procedure must be followed to reuse the
product and prevent the parts from being damaged. Replacement kit for exhaust valve mechanism.
5.3
Adjustment
5.3.1
Capacity Control Valve
The capacity control valve is set to the value in Table 5.2 at the time of shipment.
Adjustment during operation is not necessary.
Description
Set value
Note
Capacity control valve
1 to 5
o
C (0.43 to 0.49)
Evaporation
thermometer
However, if the evaporation temperature is not in the range of Table 5.2 during low-load operation, adjust
the capacity adjustment valve to the value of the table. Make any adjustment based on the procedure of
Table 5.3 while the load is not being applied.
5.3.2
Sight glass (for IDF240D-3-W only)
Check the refrigerant condition in the refrigerant circuit with the table below
(a) Check for refrigerant amount
.
1)
Air bubbles may be generated if the refrigerant circuit on the upstream of the sight glass
is clogged and pressure drops occur even if the refrigerant amount is normal.
(b) Moisture in the refrigerant circuit (colour of the indicator)
Green (DRY) ---- Good
Yellow (WET) ---- Moisture is present in the refrigerant.
(Moisture in the circuit may deteriorate the compressor oil for refrigeration and cause malfunction of the
control equipment and shorten the service life.)
Table 5.2 Set value for capacity control valve
Table 5.3 Adjustment for the capacity control valve
Evaporation temperature
o
C
Adjustment method
1
o
C or less
Remove the capacity adjustment valve cover. Then rotate the 6mm
hexagon socket head cap screw clockwise
Note) It may take time for pressure to be stabilized. Rotate the capacity adjustment valve by 1/2
revolution. After about 5 minutes, when the value is stabilized, read the evaporation thermometer.
Indicator
Glass
Sight glass
(Refrigerant in the glass)
Condition
Filled with liquid
Correct
Air leaking positions
Correct
Bubbles keep coming
Refrigerant is insufficient
1
Liquid level and gas level are separated
Refrigerant