15
<Cautions on check operation>
• If the air conditioner is started within about 12 minutes after the
power of the indoor/outdoor unit is turned on, the H2P indicator lights
and the compressor does not run.
Confirm that the LED status is as shown in the table in (2) in
“9-1 Power on and check operation”
before starting the air condi-
tioner.
• The air conditioner may require about 10 minutes maximum until it
can start the compressor after start of operation.
This period of time is required to homogenize the refrigerant status,
and does not indicate any failure.
• The check operation does not provide any means of checking the
indoor units individually. For that purpose, perform the normal oper-
ation using the remote controller after finishing the check operation.
• The check operation is not available in any other mode such as the
recovery mode.
• Before running a check on the unit, changing the indoor remote con-
troller settings might cause the error code “UF” to be displayed and
prevent a proper check to be run.
9-2 Checks in normal operation
• After finishing the check operation, operate the air conditioner nor-
mally.
(Heating is not available if the outside air temperature is 75 °F or
more. Refer to the operation manual supplied together with the
unit.)
• Confirm that the indoor and outdoor units are operating normally.
(If a knocking sound is heard in the liquid compression of the com-
pressor, stop the air conditioner immediately and energize the crank-
case heater for a sufficient period of time, then start the operation
again.)
• Run the indoor unit one by one in turn, and confirm that the corre-
sponding outdoor unit is running.
• Check to see if cold (or hot) air is coming out of the indoor unit.
• Press the fan direction button and fan speed control button on the
remote controller to see if the fan is operating normally.
<Cautions for normal operation check>
• Once stopped, the compressor will not start for about 5 minutes even
if the
“ON/OFF”
button on the remote controller is pressed.
• When the system operation is stopped by the remote control, the
outdoor units may continue to operate for a further 3 minutes.
• If the system has not undergone the check operation by the test
operation button since it was first installed, a malfunction code “U3”
is displayed.
In this case, perform the check operation by referring to
“9-1 Power
on and check operation”
.
(Check a malfunction code in the remote controller connected to the
indoor unit.)
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
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.
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.
01_EN_3PN05597-5R.fm Page 15 Wednesday, September 14, 2005 8:35 PM
