17
English
When a malfunction code is displayed in the remote
controller
(Check a malfunction code in the remote controller connected
to the indoor unit.)
Malfunction
code
Cause
Solution
E3
The stop valves in
the outdoor unit
remain closed.
Open the stop valve on both the
gas and liquid lines.
The refrigerant is
overcharged.
Calculate again the required
amount of refrigerant to be charged
based on the piping length, recover
the refrigerant using the refrigerant
recovery device, then achieve
proper amount of refrigerant.
E4
F3
The stop valves in
the outdoor unit
remain closed.
Open the stop valve on both the
gas side and liquid side.
The operation
mode on the
remote controller
was changed
before the check
operation.
Set the operation mode on all
indoor unit remote controllers to
“cooling.”
The refrigerant is
insuffi cient.
Check whether additional
•
refrigerant charge has been
fi nished correctly.
Calculate again the required
•
amount of refrigerant to be
charged based on the piping
length, then charge additionally
proper amount of refrigerant.
F6
The refrigerant is
overcharged.
Calculate again the required
amount of refrigerant to be charged
based on the piping length, recover
the refrigerant using the refrigerant
recovery device, then achieve
proper amount of refrigerant.
U3
The check
operation has not
performed.
Perform the check operation.
U4
The power is not
supplied to the
outdoor unit.
Connect correctly the power supply
wiring of the outdoor unit.
UA
Improper type of
indoor unit is
connected.
Check the type of indoor unit
currently connected. If it is not
proper, replace it with proper one.
UF
The stop valves in
the outdoor unit
remain closed.
Open the stop valve on both the
gas and liquid lines.
The piping and
wiring of the
indoor unit are
not connected
correctly to the
outdoor unit.
Confi rm that the piping and wiring
of the indoor unit are connected
correctly to the outdoor unit.
The operation
mode on the
remote controller
was changed
before the check
operation.
Set the operation mode on indoor
unit remote controller to “cooling.”
UH
The transmission
wiring is not
connected
correctly.
Connect correctly the transmission
wiring to the F1 and F2 (TO IN/D
UNIT) terminals on the PC board
(A1P) in the outdoor unit.
When nothing is displayed in the remote controller
There might be a problem with the connection or transmis-
•
sion between the indoor unit and the remote controller.
Check connections, and check for wire breakage.
CAUTION
<To piping technician>
<To electrician>
After fi nishing the test run and before using the unit by
•
customer, confi rm that the front panel and screws are
attached securely to the unit.
CAUTION FOR REFRIGERANT LEAKS
10.
DANGER
Refrigerant gas is heavier than air and replaces oxygen. A
•
massive leak could lead to oxygen depletion, especially in
basements, and an asphyxiation hazard could occur leading
to serious injury or death.
(Points to note in connection with refrigerant leaks)
Introduction
The installer and system specialist shall secure safety
against leakage according to local regulations or stan-
dards. The following standards may be applicable if local
regulations are not available.
The Split System, like other air conditioning systems, uses
R410A as refrigerant. R410A itself is an entirely safe non-toxic,
non-combustible refrigerant. Nevertheless care must be taken
to ensure that air conditioning facilities are installed in a room
which is suffi ciently large. This assures that the maximum
concentration level of refrigerant gas is not exceeded, in the
unlikely event of major leak in the system and this in accor-
dance to the local applicable regulations and standards.
Maximum concentration level
The maximum charge of refrigerant and the calculation of the
maximum concentration of refrigerant is directly related to the
humanly occupied space in to which it could leak.
The unit of measurement of the concentration is lb./ft³ ( the
weight in lb. of the refrigerant gas in 1ft³ volume of the occu-
pied space).
Compliance to the local applicable regulations and standards
for the maximum allowable concentration level is required.
Direction of the refrigerant flow
Room where
refrigerant leak
has occurred
(outflow of all the
refrigerant from
the system)
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1/18/2011 9:27:30 AM
1/18/2011 9:27:30 AM
