Daikin VRV Inverter K Series Manual page 163

SI-05C.BOOK Page 149 Monday, November 6, 2000 4:13 PM
SiE-05C
3.26 Low Pressure Drop Due to Refrigerant Shortage or Electronic Expansion
Valve Failure
U U U U 0 0 0 0
Remote Controller
Display
Supposed Causes
Troubleshooting
Troubleshooting Inverter K Series
Out of gas or refrigerant system clogging (incorrect piping)
Defect of pressure sensor
Defect of outdoor unit PC board
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
NO
pipe thermistor (R4T) and
coil thermistor (R2T)
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.
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Troubleshooting
(VF052)
149