15
English
(Check a malfunction code in the remote controller connected to the
indoor unit.)
• There might be a problem with the connection or transmission
between the indoor unit and the remote controller.
Check connections, and check for wire breakage.
CAUTION
<To piping technician>
<To electrician>
•
After finishing the test run and before using the unit by cus-
tomer, confirm that the front panel and screws are attached
securely to the unit.
10. CAUTION FOR REFRIGERANT LEAKS
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 standards. 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 condi-
tioning facilities are installed in a room which is sufficiently 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
accordance 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./ft
3
( the weight in lb.
of the refrigerant gas in 1ft
3
volume of the occupied space).
Compliance to the local applicable regulations and standards for the
maximum allowable concentration level is required.
Pay a special attention to the place, such as a basement, etc.
where refrigerant can stay, since refrigerant is heavier than air.
Procedure for checking maximum concentration
Check the maximum concentration level in accordance with steps 1 to 4
below and take whatever action is necessary to comply.
1.
Calculate the amount of refrigerant (lb.) charged to each system
separately.
When a malfunction code is displayed in the remote controller
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 control-
ler was changed
before the check
operation.
Set the operation mode on all
indoor unit remote controllers to
“cooling.”
The refrigerant is
insufficient.
• Check whether additional
refrigerant charge has been
finished 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 sup-
ply 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.
Confirm that the piping and
wiring of the indoor unit are con-
nected correctly to the outdoor
unit.
The operation mode
on the remote control-
ler 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 transmis-
sion 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
amount of refriger-
ant in the unit
(amount of refrig-
erant with which
the system is
charged before
leaving the factory)
+
additional charging
amount (amount of
refrigerant added
locally in accordance
with the length or
diameter of the refrig-
erant piping and type
of indoor unit)
=
total amount
of refriger-
ant (lb.) in
the system
Direction of the refrigerant flow
Room where
refrigerant leak
has occurred
(outflow of all the
refrigerant from
the system)
01_EN_3PN07193-9P.fm Page 15 Tuesday, June 6, 2017 3:56 PM
