En-11
LED4
LED3
LED2
LED1
Hole
LED is on a reverse
side of the board.
Confirming the operation of indoor unit
88
88
Run the unit in a normal way, and confirm its operation. (Please end the test run first
before confirmation)
(1) Cold air (or warm air) must be discharged from the indoor unit.
(2) The indoor unit operates normally when air direction or air volume adjustment button
is pressed.
PUMP DOWN
98
PUMP DOWN OPERATION
To avoid discharging refrigerant into the atmosphere at the time of relocation or disposal,
recover refrigerant by doing the cooling operation or forced cooling operation according
to the following procedure. (When the cooling operation cannot start in winter, and so on,
start the forced cooling operation.)
(1) Do the air purging of the charge hose by connecting the charging hose of gauge
manifold to the charging port of 3 way valve (At lease one unit of connected units) and
opening the low pressure valve slightly.
(2) Close the valve stem of 2 way valve (All connected units) completely.
(3) Start the cooling operation or following forced cooling operation. (All connected
units) When using the remote control unit Press the TEST RUN button after starting
the cooling operation by the remote control unit. The operation indicator lamp and
timer indicator lamp will begin to flash simultaneously during test run. When using
the MANUAL AUTO button of the indoor unit (The remote control unit is lost, and so
on.) Keep on pressing the MANUAL AUTO button of the indoor unit for more than 10
seconds. (The forced cooling operation cannot start if the MANUAL AUTO button is not
kept on pressing for more than 10 seconds.)
(4) Close the valve stem of 3 way valve (All connected units) when the reading on the
compound pressure gauge becomes 0.05
～
0 MPa (7.3
～
0 psi).
(5) Stop the operation. (All connected units) Press the START/STOP button of the remote
control unit to stop the operation. Press the MANUAL AUTO button when stopping the
operation from indoor unit side. (It is not necessary to press on keeping for more than
10 seconds.)
CAUTION
During the pump-down operation, make sure that compressor is off before you remove
the refrigerant piping. Do not remove the connection pipe while the compressor is
in operation with 2 or 3 way valve open. This may cause abnormal pressure in the
refrigeration cycle that breakage and injury.
CUSTOMER GUIDANCE
118
Explain the following to the customer in accordance with the operating manual:
(1) Starting and stopping method, operation switching, temperature adjustment, timer, air
flow adjustment, and other remote control unit operations.
(2) Air filter removal and cleaning.
(3) Give the operating manual and installation instruction sheet to the customer.
TEST RUN
88
The test run method may be different for each indoor unit that is connected. Refer to the
installation instruction sheet included with each indoor unit.
CAUTION
Always turn on the power 12 hours prior to the start of the operation in order to ensure
compressor protection.
Make a test run in accordance with the installation Manual
88
18
for the indoor unit
(1) Indoor unit
1
Is operation of each button on the remote control unit normal?
2
Does each lamp light normally?
3
Do the air flow-direction louver operate normally?
4
Is the drain normal?
5
Is there any abnormal noise and vibration during operation?
(2) Outdoor unit
1
Is there any abnormal noise and vibration during operation?
2
Will noise, wind, or drain water from the unit disturb the neighbors?
3
Is there any gas leakage?
• Do not operate the air conditioner in the test running state for a long time.
• For the operation method, refer to the operating manual and perform operation check
Outdoor unit LED
88
88
When a malfunction occurs in the outdoor unit, the LED on the circuit board lights to
indicate the error. Refer to the following table for the description of each error according
to the LED.
Error contents
LED1
LED2
LED3
LED4
Serial Communication error
(Outdoor unit to Indoor unit A)
● 1 time
–
–
–
Serial Communication error
(Outdoor unit to Indoor unit B)
–
● 1 time
–
–
Serial Communication error
(Outdoor unit to Indoor unit C)
–
–
● 1 time
–
Serial Communication error
(Outdoor unit to Indoor unit D)
–
–
–
● 1 time
Discharge temp. sensor error
● 2 times
–
–
–
Outdoor unit Heat Ex. middle temp.
sensor error
● 3 times
–
–
–
Outdoor temp. sensor error
● 4 times
–
–
–
2-way valve temp. sensor error
(for Indoor unit A)
● 5 times
–
–
–
2-way valve temp. sensor error
(for Indoor unit B)
–
● 5 times
–
–
2-way valve temp. sensor error
(for Indoor unit C)
–
–
● 5 times
–
2-way valve temp. sensor error
(for Indoor unit D)
–
–
–
● 5 times
3-way valve temp. sensor error
(for Indoor unit A)
● 6 times
–
–
–
3-way valve temp. sensor error
(for Indoor unit B)
–
● 6 times
–
–
3-way valve temp. sensor error
(for Indoor unit C)
–
–
● 6 times
–
3-way valve temp. sensor error
(for Indoor unit D)
–
–
–
● 6 times
Compressor temp. sensor error
● 7 times
–
–
–
Heat sink temp. sensor error
● 8 times
–
–
–
High pressure switch 1 error
● 9 times
–
–
–
High pressure switch 2 error
● 10 times
–
–
–
Indoor unit capacity error
● 11 times
–
–
–
Trip detection
● 12 times
–
–
–
Compressor rotor position detection
error
● 13 times
–
–
–
Trip terminal L error
● 14 times
–
–
–
Outdoor unit fan motor error
● 15 times
–
–
–
Outdoor unit PCB microcomputer
communication error
● 17 times
–
–
–
Discharge temperature error
● 18 times
–
–
–
Compressor temperature error
● 19 times
–
–
–
4-way valve error
● 20 times
–
–
–
Outdoor unit PCB model information
error
● 21 times
–
–
–
Active filter error, PFC circuit error
● 22 times
–
–
–
● : flashing – : Off
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