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57

Use an adapter for preventing vacuum pump oil from
flowing back to the gauge
manifold hose. ON/OFF operation of the vacuum pump
should be made by theS
adapter switch.
(1) Remove both valve shaft caps of the stop valves.
(2) Remove the service port cap of the stop valve (gas

side).

(3) Connect the gauge manifold hose to the service port

and the vacuum pump. Be sure that the hose end to
be connected to the service port has a valve core
pusher.

(4) Open the gauge manifold valve and operate the

vacuum pump for 10-15 minutes. Make sure the
compound gauge reads -0.1MPa(-76cmHg).

(5) Close the gauge manifold valve.
(6) Turn off the vacuum pump.
(7) Fully open the stop valve (liquid side) with hexagon

socket screw key. Turn all the way up to contact.

(8) Fully open the stop valve (gas side) with hexagon

socket screw key. Turn all the way up to contact.

(9) Disconnect the gauge manifold hose from the service

port.

(10) Replace the service port cap and both valve shaft

caps tightly. Turn until the torque suddenly increases.
Now tighten a 1/6-turn more.

Notes:
• Use a gauge manifold and hoses exclusive for R410A.
• After air removal, check the tube connections for gas
  leak using a leakage detector or soapy water. Regarding
  leakage detector, use high-sensitivity type designed
  specially for R410A.
• When opening the valve with a hexagon socket screw
   key, some refrigerant might be let out. This is not a
  system trouble.

4

mm

mm

Service port

Service port

Hexagon socket screw key

Hexagon socket screw key

Valve shaft cap

Valve shaft cap

OPEN

OPEN

Lo

Hi

Stop valve
(gas side)

Stop valve
(liquid side)

Vacuume pump adapter

Service port

Hose

Compound
gauge

Gauge manifold

(Pump down is adopted in the case of unit removal for re-
installation, abandonment, repair etc.)
Pump down is to collect the refrigerant into the outdoor
unit by control of the stop valves and the compressor.
(1) Turn the circuit breaker on.
(2) Check that all LED (AE-XM18CR:LED51,52 /

AE-XM24CR:LED50,51,52) on the display board unit
are flashing synchronously in a slow (one flash per
second) cycle.

(3) Stop the air conditioner operation and connect the

gauge manifold (compound gauge side) hose to the
service port of the stop valve (gas side).

(4) Remove the air in the hose by loosening screw a

shown in the figure below.

(5) Press the PUMP DOWN SWITCH (SW51) on the

display board unit for 5 seconds or more. The indoor/
outdoor unit will start operation in the pump down
mode. (the OPERATION lamp on the indoor unit will
flash and three BEEP will be emitted.)

(6) After 5 minutes, fully close the stop valve (liquid side)

by turning the hexagon socket screw key clockwise.

(7) Close the stop valve (gas side) to half closed position.
(8) Keep running the air conditioner for 40~60 seconds.

When the pressure of the compound gauge reads
0.05MPa(0.5kgf/cm 

2

), immediately close the stop

valve (gas side) fully.

(9) Press the PUMP DOWN SWITCH (SW51) on the

display board unit for 5 seconds or more.
The operation of indoor/outdoor unit will stop.

(10)Disconnect the gauge manifold hose from the service

port.

(11)Replace the service port cap and both valve shaft

caps tightly.

Notes:
•

Wait more than 90 seconds after finishing pump
down, and turn off the circuit breaker off.

•

If the air conditioner pressure drops below
0.05MPa(0.5kgf/cm

 

2

), indoor unit side becomes

negative pressure. As
a result, moisture or dust in the air will enter into the
indoor unit. Therefore, stop the air conditioner when
pressure is between 0.05~0MPa(0.5~0kgf/cm 

2

).

Max. piping length   A

Max. total piping length

of all unit

Max. level difference   B

AE-XM18CR

20m

30m

10m

AE-XM24CR

20m

40m

10m

B

B

TRAP

OUTDOOR 
UNIT

INDOOR UNIT

A

a. When the outdoor unit is placed at 
    a higher level than the indoor 
    units, provide a trap near the 
    hose’s lead-in port. 

58

Miswiring check must be performed after installation, re-
installation and service.
This multi-type air conditioner is designed with a WIRE
CHECK SWITCH on the outdoor unit, and miswiring of
unit-to-unit wiring will be self-corrected by microcomputer.
Miswiring check may not be performed when the outdoor
temperature is below 5˚C.
(1) Complete the unit-to-unit wiring/piping and perform the

air removing of the pipes. Turn the electrical circuit
breaker ON. Before turning the circuit breaker ON,
make sure no one is working on the indoor units
installation. Electrical shock or injury may occur.

(2) Check that all LED (AE-XM18CR:LED51,52/AE-

XM24CR:LED50,51,52) on the display board unit are
flashing synchronously in a slow (one flash per
second) cycle. If either one or more of all LED is/are
kept lighted on, check and correct the wrong wirings
among      , N, 1, 2, terminals so that all LED will flash
slowly, showing normal
condition.

(3) Press the WIRE CHECK SWITCH (SW50) on the

display board unit for 5 seconds or more. The flashing
of all LED will change. Miswiring (mispiping) check will
start and the indoor and outdoor units will start
operating. (The red operation lamp on the indoor unit
will flash, and three BEEP will be emitted. ) Miswiring
of unit-to-unit wiring will be self-corrected.

(4) Wrong piping works cannot be corrected, and will be

detected as an error. When an error is detected during
checking, all LED will show triple flash for eight times.
The indoor and outdoor operation will stop. Turn the
circuit breaker OFF and check and correct the
miswiring (mispiping)*. After correction, return to step
1 and repeat the miswiring (mispiping) check again. If
error is still detected, or other types of LED signal
should be indicated, please contact a service
technician. (Refer to wiring diagram attached inside
the outdoor unit cabinet for
self diagnosis signal.)

(5) All LED (AE-XM18CR:LED51,52/AE-XM24CR:

LED50,51,52) will flash synchronously in a slow (one
flash per second) cycle when miswiring (mispiping)
check is completed with no error detection (3~6
minutes), and the operation of indoor and outdoor
units will stop .(The red operation lamp flashing on
the indoor unit will go off.)

(6) Place the control box cover back in the reverse order.

*Correction points on error detection
1. Are all piping the total multi air conditioner system
connected?
2. Are the stop valves open?

AUX.

Lo

Hi

a

SW51

SW51

UNIT B

UNIT B

UNIT C

UNIT C

SW50

SW50

PUMP DOWN

PUMP DOWN

WIRE CHECK

WIRE CHECK

LED51

LED51

UNIT A

UNIT A

LED52

LED52

LED50

LED50

Stop valve
(gas side)

Stop valve
(liquid side)

Service port

Hose

Compound
gauge

Gauge manifold

SW51

SW51

UNIT B

UNIT C

SW50

SW50

PUMP DOWN

PUMP DOWN

WIRE CHECK

WIRE CHECK

(UNIT C : AE-X24CR only)

LED51

LED51

UNIT A

UNIT A

LED52

LED52

LED50

LED50

(1) Open the open panel to see the control section.
(2) Start the operation with the remote control.
(3) Press the " AUX. " button on the unit for 5 seconds or

more. A beep sound is heard and the OPERATION
lamp starts flashing. Now the system is in the cooling
test run mode.

(4) To put the system in the heating test run mode, start

the cooling operation and select the heating mode on
the remote control.

(5) Make sure the system runs well, and press the AUX.

button again to stop the operation

59

1. Open the opne panel, and remove 2 air filters.

2. Remove 4 screws fixing the front panel.

3. Remove the screw fixing the cord clamp.
Note :
During reassembly, install the holder after installing the
front panel. This will make it
easier to assemble the front panel.

4. Close the open panel. Pushing the nail of the front

panel.

5. Pull the front panel up.

6. Remove the unit-to-unit wiring from the terminal

board.

7. Remove a screw fixing the control box cover, and

remove it.

8. Remove 2 screws fixing the 2 ground wires and

terminal.

Note :
During reassembly, take care direction of the lead wires.

60

CN1

CN5

CN4

CN3

9. Remove 2 screws fixing the sensor holder, lead cover

A and lead cover B from the evaporator.

10-1.Cut off 2 fixing bands.

During reassembly, fix them by fixing bands as same
certainly.

10-2.Cut off 3 fixing bands.

During reassembly, fix them by fixing bands as same
certainly.

11. Remove 2 thermistors of the evaporator and the pipe.

12.Remove 4 conectors.

13. Pushing the 2 hooks of the holder, remove the display

board unit 3 from the holder.
And remove 2 screws fixing the cluster holder from the
drain pan.

14.Remove 3 screws fixing the LED HOLDER B

15. Remove the screw fixing the pipe holder.