Daikin Comfora FTXP20~71L2V1B, Service Manual

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1 Troubleshooting
Service manual
15
ATXP20~3 FTXP20~7 ARXP20~3
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
1.6.4 Operating noise and vibrations
Check Detail
Check the installation conditions
(specified in the installation
manual). ▪ Use general vibration
prevention where needed.
▪ If the mounting wall is too thin,
you must use cushion material
or rubber, or change the
installation place.
▪ Refrigerant piping is too short;
is the length within specified
range?
▪ Due to bad installation or
general conditions there may
be deformation of the unit.
▪ Are all the screws installed and
tightened properly?
▪ Is all piping secured, fixed and
supported by inserting a
cushion material where
needed?
▪ Install piping weights or correct
by hand if any piping is in
contact with other parts.
▪ Is the fan in contact with other
parts? If so separate the fan
from the other parts.
Check refrigerant charge. ▪ Is the unit filled with the
specified refrigerant volume?
▪ Is there a flushing noise, due
to refrigerant shortage?
▪ Is there air in the system?
Check the expansion valve. If a passing sound is heard from
the pressure reducing valve,
apply sound insulation sheets of
putty to reduce the valve noise.
1.6.5 Abnormal high pressure
In cooling mode
Check item Detail
Does the outdoor unit fan run
normally? Visual inspection
Is the outdoor unit heat
exchanger clogged? Visual inspection
Is there clogging before or after
the expansion valve (capillary)? ▪ Check if there is a temperature
difference before and after
expansion valve (capillary).
▪ Check if the main valve unit of
expansion valve operates (by
noise, vibration).
Is the High Pressure Switch
normal? Check continuity by using a
tester.
Is the outdoor unit installed under
such conditions that short circuit
easily occurs? Visual inspection
Is the piping length ≤5 m? Visual inspection
Does air enter the refrigerant
system? Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
Is the refrigerant overcharged? Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
In cooling mode
Check item Detail
Does the indoor unit fan run
normally? Visual inspection
Is the indoor unit heat exchanger
clogged? Visual inspection
Is the indoor unit installed under
such conditions that short circuit
easily occurs? Visual inspection
Is there clogging before or after
the expansion valve (capillary)? ▪ Check if there is a temperature
difference before and after
expansion valve (capillary).
▪ Check if the main valve unit of
expansion valve operates (by
noise, vibration).
Is the High Presure Switch
normal? Check continuity by using a
tester.
Is the minimum piping length
respected? Visual inspection
Does air enter the refrigerant
system? Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
Is the refrigerant overcharged? Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
1.6.6 Abnormal low pressure
Abnormally low pressure level is mostly caused by the evaporator
side. The following contents are provided based on field checking of
service engineer. Further, the number is listed in the order of degree
of influence.
In cooling mode
Check item Detail
Does the outdoor unit fan run
normally? Visual inspection
Is the indoor unit heat exchanger
clogged? Visual inspection
Is there clogging before or after
the expansion valve (capillary)? ▪ Check if there is a temperature
difference before and after
expansion valve (capillary).
▪ Check if the main valve unit of
expansion valve operates (by
noise, vibration).
Is the check valve clogged? Check if there is a temperature
difference before and after check
valve. If YES, the check valve is
caught.
Is the indoor unit installed under
such conditions that short circuit
easily occurs? Visual inspection
Is the refrigerant gas short? Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
In cooling mode
Check item Detail
Does the outdoor unit fan run
normally? Visual inspection
Is the outdoor unit heat
exchanger clogged? Visual inspection
Is the outdoor unit installed under
such conditions that short circuit
easily occurs? Visual inspection