Daikin VRV Service Manual

Si30-408 Malfunction Tree Analysis (FTA)
Troubleshooting 101
4.5 Defective Lubrication of Compressor
Load under
Short circuit
Dirty evaporator
Dirty air filter
Faulty control
Gas leakage
Faulty lubrication
of compressor
Oil volume
too small
Faulty oil
feed
Run out of oil
film
(Viscosity
low)
Oil return
volume low
Oil
discharge
volume high
Forming on
start-up
Backflow of
accumulated
refrigerant
ilution of oil
Oil
temperature
drop
Oil temperature
rise
Deterioration of
oil
Clogged oil return
path
Abnormal piping
length
Refrigerant
circulation low
Wet
operation
Clogged feed oil path
(Feed oil pump
failure)
Excessive
compressor
stop / start
Wet
operation
Abnormal
overheat
operation
Moisture
mixed
Foreign matter
contamination
Clogged oil
return capillary
Clogged oil
separator
Refrigerant
charging low
Faulty
expansion
valve unit
Piping
connection with
the other way
Deformation of
piping
Faulty solenoid
valve unit
Foreign matters
caught
Faulty expansion
valve unit
Clogged
refrigerant filter
Shortage of gas
Faulty operation
of expansion
valve
(Closing direction)
Excessive of
defrost time period
Faulty crank case
heater
Refrigerant over
charging
Refrigerant over
charging
Evaporator
airflow shortage
Clogged
refrigerant system
Liquid injection
solenoid valve
leakage
Excessive
compressor start /
stop
Faulty actuation
of expansion
valve (Opening
direction)
Moisture
contamination ·
Foreign matter
contamination
Faulty control
Faulty control

Daikin VRV Specifications

General

Brand	Daikin
Energy Efficiency	High
Control	Centralized and individual zone control
Inverter Technology	Yes
Type	Variable Refrigerant Volume (VRV)
Cooling Capacity	Varies by model
Heating Capacity	Varies by model
Refrigerant	R-32 or R-410A
Application	Commercial buildings, large residential spaces
SEER	Varies by model
HSPF	Varies by model
EER	Varies by model
COP	Varies by model
Sound Level	Varies by model
Indoor Unit Options	wall-mounted, ducted