Operating Noise And Vibrations; Abnormal High Pressure; Abnormal Low Pressure - Daikin Comfora FTXP20~71L2V1B Service Manual

1.6.4

Operating noise and vibrations

Check
Check the installation conditions
(specified in the installation
manual).
Check refrigerant charge.
Check the expansion valve.
1.6.5

Abnormal high pressure

In cooling mode
Check item
Does the outdoor unit fan run
normally?
Is the outdoor unit heat
exchanger clogged?
Is there clogging before or after
the expansion valve (capillary)?
Is the High Pressure Switch
normal?
Is the outdoor unit installed under
such conditions that short circuit
easily occurs?
Is the piping length ≤5 m?
Does air enter the refrigerant
system?
Is the refrigerant overcharged?
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
Detail
▪ 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
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.
▪ Is the unit filled with the
specified refrigerant volume?
▪ Is there a flushing noise, due
to refrigerant shortage?
▪ Is there air in the system?
If a passing sound is heard from
the pressure reducing valve,
apply sound insulation sheets of
putty to reduce the valve noise.
Detail
Visual inspection
Visual inspection
▪ 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).
Check continuity by using a
tester.
Visual inspection
Visual inspection
Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
In cooling mode
Check item
Does the indoor unit fan run
normally?
Is the indoor unit heat exchanger
clogged?
Is the indoor unit installed under
such conditions that short circuit
easily occurs?
Is there clogging before or after
the expansion valve (capillary)?
Is the High Presure Switch
normal?
Is the minimum piping length
a
respected?
Does air enter the refrigerant
system?
Is the refrigerant overcharged?
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
Does the outdoor unit fan run
normally?
Is the indoor unit heat exchanger
clogged?
Is there clogging before or after
the expansion valve (capillary)?
Is the check valve clogged?
Is the indoor unit installed under
such conditions that short circuit
easily occurs?
Is the refrigerant gas short?
In cooling mode
Check item
Does the outdoor unit fan run
normally?
Is the outdoor unit heat
exchanger clogged?
Is the outdoor unit installed under
such conditions that short circuit
easily occurs?
1 Troubleshooting
Detail
Visual inspection
Visual inspection
Visual inspection
▪ 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).
Check continuity by using a
tester.
Visual inspection
Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
Detail
Visual inspection
Visual inspection
▪ 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).
Check if there is a temperature
difference before and after check
valve. If YES, the check valve is
caught.
Visual inspection
Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
Detail
Visual inspection
Visual inspection
Visual inspection
Service manual
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