Mitsubishi Electric MFZ-KW25VG Notice D'installation page 11

4. TEST RUN
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 valves are fully closed and covered in caps in initial state.)
2) Connect gauge manifold valve and vacuum pump to service port of stop valve
on the gas pipe side of the outdoor unit.
*4 to 5 turns
Stop valve cap
(Torque 19.6 to
*Close
29.4 N•m, 200
*Open to 300 kgf•cm)
Hexagonal wrench
Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•cm)
Precautions when using the control valve
<R32>
A
Open
Body
Make sure to
Close
Control
replace the cap after
valve
the operation.
4-2. TEST RUN
Make sure the following is done.
• 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 opera-
tion indicator blinks every 0.5 seconds, inspect the indoor/outdoor unit connecting wire (A) for mis-wiring. After the test run, emergency
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 (10) 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.
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.)
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 representative to deactivate the function. Refer to the service manual for details.
4-4. EXPLANATION TO THE USER
• Using the OPERATING INSTRUCTIONS, explain to the user how to use the air conditioner (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.
5. PUMPING DOWN
When relocating or disposing of the air conditioner, pump down the system follow-
ing 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.)
Compound pressure gauge
–
0.101 MPa
(for R32, R410A)
–
( 760 mmHg)
Pressure gauge
(for R32, R410A)
Stop valve
for LIQUID
Gauge manifold valve
(for R32, R410A)
Handle
Low
Handle High
Charge hose
Stop valve for
(for R32, R410A)
GAS
Adapter for
preventing the
back flow Vacuum pump (or the vacuum
pump with the function to
prevent the back flow)
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.
When attaching the control valve to
the service port, make sure that the
Service port
valve core is in closed position, and
then tighten part A. Do not tighten
part A or turn the body when valve
Charge
core is in open position.
hose
3) Run the vacuum pump. (Vacuumize until 500 microns is achieved.)
4) Check the vacuum with gauge manifold valve, then close gauge mani-
fold valve, and stop the vacuum pump.
5) Leave as it is for one or two minutes. Make sure pointer gauge manifold
valve remains 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.
To avoid risk of fire, make sure that there are no flammable hazards
or ignition risks before opening the stop valves.
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
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
6) Stop the emergency COOL operation.
Press the E.O. SW several times until all LED lamps turn off. Refer to operating
instructions for details.
WARNING
When the refrigeration circuit has a leak, do not execute pump down with
the compressor. When pumping down the refrigerant, stop the compres-
sor before disconnecting the refrigerant pipes. The compressor may burst
if air etc. get into it.
WARNING
Emergency operation
switch (E.O. SW)
).
2
EN-10
EN