Daikin VRV Inverter K Series Manual page 328

SI-05C.BOOK Page 314 Monday, November 6, 2000 4:13 PM
Troubleshooting
3.18 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 Troubleshoot the outdoor unit for which the HWL is lit in accordance with the following flow chart.
314
Out of gas or refrigerant system clogging (incorrect piping)
Defect of thermistor (R2T, R4T) of INV outdoor unit
Defect of low pressure sensor of INV outdoor unit
Defect of outdoor unit PC board of INV outdoor unit
YES
Cooling
NO
(3) on both sides of outdoor
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 is
YES
Out of gas or refrigerant system is
1.0 kg/cm² (0.098 MPa)
or less. clogged. Requires check of
refrigerant system.
NO
The
voltage of
X21A pins (2) and
YES
Replace outdoor unit PC board.
unit PC board (A1P)
is 0.8 VDC
or less.
NO
Replace low pressure sensor.
Out of gas or refrigerant system is
clogged. Requires check of
refrigerant system.
Replace the thermistor.
Replace the outdoor unit PC board :
A1P
: http://splitoff.ru/tehn-doc.html
Troubleshooting PLUS Series
SiE-05C
(VF152)