Low Pressure Drop Due To Refrigerant Shortage Or Electronic Expansion Valve Failure - Daikin VRV K Manual

SI-95.BOOK Page 102 Friday, March 31, 2000 10:59 AM
Troubleshooting
2.26 Low Pressure Drop Due to Refrigerant Shortage or Electronic Expansion
Valve Failure
U U U U 0 0 0 0
Remote Controller
Display
I Refrigerant shortage or refrigerant system clogging (incorrect piping)
Supposed Causes
I Defect of pressure sensor
I Defect of outdoor unit PC board
Troubleshooting
102
YES
Cooling
NO
The suction
YES
pipe temperature minus
coil temperature is 20 ˚C
or higher.
NO
Resistance
is normal when
measured with the
suction pipe thermistor
NO
(R4-1T, R4-2T) and coil
thermistor (R2-1T, R2-2T)
disconnected from
the outdoor
unit PC
board.
YES
Low pressure
YES
is 1.0 kg/cm² (0.098 MPa) or Out of gas or refrigerant system is
less.
clogged. Requires check of
refrigerant system.
NO
The voltage
of X21A pins (2)
and (3) on both sides of
YES
outdoor unit PC board (A1P) is
Replace outdoor unit PC board.
0.8 VDC or less.
(Pressure sensor
output
voltage)
NO
Replace pressure sensor.
Out of gas or refrigerant system is
clogged. Requires check of
refrigerant system.
Replace the thermistor.
Replace the outdoor unit PC
board.
Troubleshooting Inverter K Series
Si-95
(VF052)