4-1. PURGING PROCEDURES AND LEAK TEST
1) Remove service port cap of stop valve on the side of the outdoor unit gas pipe. (The
stop valve will not work in its initial state fresh out of the factory, totally closed with
cap on.)
2) Connect gauge manifold valve and vacuum pump to service port of stop valve on
the gas pipe side of the outdoor unit.
5-1. PUMPING DOWN
When relocating or disposing of the air conditioner, pump down the system following
the procedure below so that no refrigerant is released into the atmosphere.
1) Connect the gauge manifold valve to the service port of the stop valve on the gas
pipe side of the outdoor unit.
2) Fully close the stop valve on the liquid pipe side of the outdoor unit.
3) Close the stop valve on the gas pipe side of the outdoor unit almost completely so
that it can be easily closed fully when the pressure gauge shows 0 MPa [Gauge] (0
kgf/cm
2
).
4) Start the emergency COOL operation.
To start the emergency operation in COOL mode, disconnect the power supply plug
and/or turn off the breaker. After 15 seconds, connect the power supply plug and/or
turn on the breaker, and then press the E.O. SW once. (The emergency COOL
operation can be performed continuously for up to 30 minutes.)
5) Fully close the stop valve on the gas pipe side of the outdoor unit when the pressure
gauge shows 0.05 to 0 MPa [Gauge] (approx. 0.5 to 0 kgf/cm
2
).
6) Stop the emergency COOL operation.
Press the E.O. SW twice to stop the operation.
Stop valve for
GAS
Stop valve cap
(Torque 19.6 to
29.4 N•m, 200
to 300 kgf▪cm)
Vacuum pump (or the vacuum
pump with the function to
prevent the back flow)
Gauge manifold valve
(for R410A)
Compound pressure gauge
(for R410A)
–
0.101 MPa
(
–
760 mmHg)
Handle
Low
Handle High
Adapter for pre-
venting the back
flow
Charge hose
(for R410A)
*Close
*Open
Hexagonal wrench
Precautions when using the control valve When attaching the control valve
to the service port, valve core may
deform or loosen if excess pressure
is applied. This may cause gas leak.
Service port
Charge hose
Body
Close
Open
Control valve
A
When attaching the control valve to
the service port, make sure that the
valve core is in closed position, and
then tighten part A. Do not tighten
part A or turn the body when valve
core is in open position.
Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•cm)
*4 to 5 turns
3) Run the vacuum pump. (Vacuumize for more than 15 minutes.)
4) Check the vacuum with gauge manifold valve, then close gauge manifold valve, and
stop the vacuum pump.
5) Leave as it is for one or two minutes. Make sure pointer gauge manifold valve re-
mains in the same position. Confirm that pressure gauge shows –0.101 MPa [Gauge]
(–760 mmHg).
6) Remove gauge manifold valve quickly from service port of stop valve.
7) After refrigerant pipes are connected and evacuated, fully open all stop valves on
both sides of gas pipe and liquid pipe. Operating without fully opening lowers the
performance and this causes trouble.
8) Refer to 1-3., and charge the prescribed amount of refrigerant if needed. Be sure to
charge slowly with liquid refrigerant. Otherwise, composition of the refrigerant in the
system may be changed and affect performance of the air conditioner.
9) Tighten cap of service port to obtain the initial status.
10) Leak test
Stop valve
for LIQUID
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN
Pressure gauge
(for R410A)
5. PUMPING DOWN
4-4. EXPLANATION TO THE USER
• Using the OPERATING INSTRUCTIONS, explain to the user how to use the air condi-
tioner (how to use the remote controller, how to remove the air filters, how to remove or
put the remote controller in the remote controller holder, how to clean, precautions for
operation, etc.)
• Recommend the user to read the OPERATING INSTRUCTIONS carefully.
Emergency
operation switch
(E.O. SW)
Caution:
• After test run or remote signal reception check, turn off the unit with the E.O. SW or the
remote controller before turning off the power supply. Not doing so will cause the unit
to start operation automatically when power supply is resumed.
To the user
• After installing the unit, make sure to explain the user about auto restart function.
• If auto restart function is unnecessary, it can be deactivated. Consult the service repre-
sentative to deactivate the function. Refer to the service manual for details.
4-3. AUTO RESTART FUNCTION
This product is equipped with an auto restart function. When the power supply is stopped
during operation, such as during blackouts, the function automatically starts operation in the
previous setting once the power supply is resumed. (Refer to the operating instructions for
details.)
4-2. TEST RUN
Make sure the following is done.
• The area around the damper is free of any objects, and the movement of the damper is not
blocked.
• Panel is installed correctly.
• Indoor and outdoor units are installed
correctly, and power is supplied.
1) Press the E.O. SW once for COOL,
and twice for HEAT operation. Test
run will be performed for 30 minutes. If
the left lamp of the operation indicator
blinks every 0.5 seconds, inspect the
indoor/outdoor unit connecting wire (A)
for mis-wiring. After the test run, emer-
gency mode (set temperature 24ºC) will
start.
2) To stop operation, press the E.O. SW several times until all LED lamps turn off. Refer to
operating instructions for details.
Checking the remote (infrared) signal reception
Press the ON/OFF button on the remote controller (12) and check that an electronic sound
is heard from the indoor unit. Press the ON/OFF button again to turn the air conditioner off.
• Once the compressor stops, the restart preventive device operates so the compressor
will not operate for 3 minutes to protect the air conditioner.
3-3. PIPE CONNECTION
• Fasten flare nut with a torque wrench as specified in the table.
• When fastened too tight, flare nut may break after a long period and cause refrigerant
leakage.
Indoor unit connection
Connect both liquid and gas pipings to indoor unit.
• Apply a thin coat of refrigeration oil (J) on the seat surface of pipe.
• For connection, first align the center, then tighten the first 3 to 4 turns of flare nut.
• Use tightening torque table below as a guideline for indoor unit side union joint sec-
tion, and tighten using two wrenches. Excessive tightening
damages the flare section.
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit in
the same manner applied for indoor unit.
• For tightening, use a torque wrench or spanner and use
the same tightening torque applied for indoor unit.
3-4. INSULATION AND TAPING
1) Cover piping joints with pipe cover.
2) For outdoor unit side, surely insulate every piping including valves.
3) Using piping tape (G), apply taping starting from the entry of outdoor unit.
• Stop the end of piping tape (G) with tape (with adhesive agent attached).
• When piping have to be arranged through above ceiling, closet or where the
temperature and humidity are high, wind additional commercially sold insulation to
prevent condensation.
WARNING
When installing the unit, securely connect the refrigerant pipes before starting
the compressor.
When pumping down the refrigerant, stop the compressor before disconnecting
the refrigerant pipes. The compressor may burst if air etc. get into it.
WARNING
