Pumping Down - Mitsubishi Electric MXZ-3C24NA3 Notice D'installation

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4-4. LO ERING THE OPERATION NOISE OF THE OUTDOOR UNIT

• Description of the function:

With this function, the operating noise of the outdoor unit can be lo ered by reducing the operation load, for example, during nighttime in COOL mode. Ho ever,

please note that the cooling and heating capacity may lo er if this function is activated.

* Changing the setting is required to activate this function. Please explain about this function to your customers and ask them hether they ant to use it.

Ho to lo er the operating noise

1) Be sure to turn off the main po er for the air conditioner before making the

setting.

2) Set the "5" of SW1 on the outdoor controller board to ON to enable this function.

3) Turn on the main po er for the air conditioner.

4-5. TEST RUN

• Test runs of the indoor units should be performed individually. See the installation manual coming ith the indoor unit, and make sure all the units operate properly.

• If the test run ith all the units is performed at once, possible erroneous connections of the refrigerant pipes and the indoor/outdoor unit connecting ires cannot be

detected. Thus, be sure to perform the test run one by one.

A b o u t t h e re s t a rt p ro t e c t i v e m e c h a n i s m

Once the compressor stops, the restart preventive device operates so the compressor ill not operate for 3 minutes to protect the air conditioner.

W i ri n g / p i p i n g c o rre c t i o n fu n c t i o n

This unit has a iring/piping correction function hich corrects iring and piping combination. When there is possibility of incorrect iring and piping combination,

and confirming the combination is difficult, use this function to detect and correct the combination by follo ing the procedures belo .

Make sure that the follo ing is done.

e n

• Pow er is supplied to the unit.

• Stop valves are open.

N o t e :

During detection, the operation of the indoor unit is controlled by the outdoor unit. During detection, the indoor unit automatically stops operation. This is not a mal-

function.

Procedure

Press the piping/ iring correction s itch (SW871) 1 minute or more after turning on the

pow er supply .

• Correction completes in 10 to 20 minutes. When the correction is completed, its result

is show n by LED indication. Details are described in the follow ing table.

• To cancel this function during its operation, press the piping/ iring correction s itch

(SW871) again.

• When the correction completed ithout error, do not press the piping/ iring correction

s itch (SW871) again.

When the result is "Not completed", press the piping/ iring correction s itch (SW871) again

to cancel this function. Then, confirm the iring and piping combination in a conventional

manner by operating the indoor units one by one.

• The operation is done hile the po er is supplied. Make sure not to contact parts other

than the s itch, including the P.C. board. This may cause electric shock or burn by hot

parts and live parts around the s itch. Contacting the live parts may cause P.C. board

damage.

• To prevent electronic control P.C. board damage, make sure to perform static elimination

before operating this function.

• This function does not operate hen the outside temperature is 32°F (0°C) or belo .

4-6. EXPLANATION TO THE USER

• Using the OPERATING INSTRUCTIONS, explain to the user ho to use the air conditioner (ho to use the remote controller, ho to remove the air filters, ho to

remove or put the remote controller in the remote controller holder, ho to clean, precautions for operation, etc.).

• Recommend the user to read the OPERATING INSTRUCTIONS carefully .

5. PUMPING DO N

When relocating or disposing of the air conditioner, pump dow n the sy s t em follow ing the procedure below so that no refrigerant is released into the atmosphere.

1) Turn off the breaker.

2) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit.

3) Fully close the stop valve on the liquid pipe side of the outdoor unit.

4) Turn on the breaker.

5 ) Start the emergency COOL operation on all the indoor units.

6) When the pressure gauge show s 0.1 to 0 psi [Gauge] (0.05 to 0 MPa), fully close the stop valve on the gas pipe side of the outdoor unit and stop the operation. (Refer

to the indoor unit installation manual about the method for stopping the operation.)

* If too much refrigerant has been added to the air conditioner sy s t em, the pressure may not drop to 0.1 to 0 psi [Gauge] (0.05 to 0 MPa), or the protection function

may operate due to the pressure increase in the high-pressure refrigerant circuit. If this occurs, use a refrigerant collecting device to collect all of the refrigerant in

the system, and then recharge the system ith the correct amount of refrigerant after the indoor and outdoor units have been relocated.

7) Turn off the breaker. Remove the pressure gauge and the refrigerant piping.

W h e n t h e re fri g e ra t i o n c i rc u i t h a s a l e a k , d o n o t e x e c u t e p u m p d o w n w i t h t h e c o m p re s s o r.

W h e n p u m p i n g d o w n t h e re fri g e ra n t , s t o p t h e c o m p re s s o r b e fo re d i s c o n n e c t i n g t h e re fri g e ra n t p i p e s .

T h e c o m p re s s o r m a y b u rs t i f a i r e t c . g e t i n t o i t .

WARNING

SW1

1 2 3 4 5 6

Low er the operating noise

LED indication during detection

LED3

LED1

LED2

(Red)

(Y ellow )

(Green)