Check
SiUS331708EA
261
Service Diagnosis
5.5
Refrigerant Overcharge Check
In case of
VRV
Systems, the only way to judge as the overcharge of refrigerant is with operating
conditions due to the relationship to pressure control and electronic expansion valve control.
As information for making a judgment, refer to the information below.
Diagnosis of overcharge of refrigerant
1. High pressure rises. Consequently, overload control is conducted to cause insufficient cooling
capacity.
2. The superheated degree of suction gas lowers (or the wet operation is performed).
Consequently, the compressor becomes lower in discharge pipe temperature despite of
pressure loads.
3. The subcooled degree of condensate rises. Consequently, in heating, the temperature of
discharge air through the subcooled section becomes lower.
CHECK 6
Cooling
High pressure
Low pressure
Frequency
High pressure
gradually rises with
increase in
frequency.
Subcooling degree
becomes higher.
(Liquid connection
pipe temperature
lowers.)
Low pressure rises due
to decreased
compressor output.
High pressure
Low pressure
Frequency
Heating
The outdoor unit electronic expansion valve
is closed due to the overload control.
Frequency comes to
the minimum level.
(
High pressure
is maintained
at a constant level.)
Low pressure
rises
due to
decreased
frequency.
To maintain
high pressure
,
frequency
decreases
under the
capacity control.
High pressure
drops or rises
immediately after the overload
control is complete.
Low pressure
drops due to
closed outdoor unit
electronic expansion valve.
Hot gas bypass is activated
for
low pressure
protection,
i.e., hunting at
low pressure
.
Higher degree of overcharge
(Degree of overcharge)
Proper amount
To maintain low pressure, frequency
increases under the capacity
control.
Frequency comes to
the minimum level.
High pressure
dropping control
(Low pressure is
maintained at a
constant level.)
Содержание RXSQ24TAVJU
Страница 1: ...Service Manual SiUS331708EA RXSQ24 36 48 60TAVJU Heat Pump 60 Hz...
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Страница 291: ...SiUS331708EA Wiring Diagrams Appendix 278 RXSQ60TAVJU 3D109547A...
Страница 292: ...Wiring Diagrams SiUS331708EA 279 Appendix 1 2 Indoor Unit FXFQ07 09 12 15 18 24 30 36 48TVJU 3D086460B...
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