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13. PUMP DOWN

 WARNING

Never touch electrical components such as the terminal blocks except the 

button on 

the display board. It may cause a serious accident such as electric shock.
During the pump-down operation, make sure that the compressor is turned off 

before you remove the refrigerant piping.  

Do not remove the connection pipe while the compressor is in operation with valves 

open. This may cause abnormal pressure in the refrigeration cycle that leads to 

breakage and even injury.

 CAUTION

Perform the pump down operation before disconnecting any refrigerant pipe or 

electric cable.
Collect refrigerant from the service port or the 3-way valve if pump down cannot be 

performed.
In case of a group control system installation, do not turn the power off pump down is 

completed in all outdoor units.

(Group control system installation described in “SPECIAL INSTALLATION 

METHODS” in the installation manual of the indoor unit.)
Please check the refrigerant circuit for any leaks before starting the pump down 

operation.

Do not proceed with the pump down operation if there is no refrigerant left in the 

circuit due to bent or broken piping.

• 

Operate “PUMP DOWN” button on the display board in the manner described 
below.

6:

6:

6:

6:

6:

LED display part

Button part

13.1. Preparation for pump down

•  Confirm that the power is off, and then open the service panel.

13.2. Pump down procedure

(1)  Check the 3-way valves (both the liquid side and gas side) are opened.
(2)  Turn the power on.

POWER/ 

MODE

ERROR

PUMP  

DOWN

LOW 

NOISE

PEAK 

CUT

(L1)

(L2)

(L3)

(L4)

(L5)

(L6)

Sign “

”: Lights off, “

”: Lights on

(3)  Press “PUMP DOWN” button for 3 seconds or more after 3 minutes after power on.

POWER/ 

MODE

ERROR

PUMP  

DOWN

LOW 

NOISE

PEAK 

CUT

(L1)

(L2)

(L3)

(L4)

(L5)

(L6)

Sign “

”: Lights off, “

”: Lights on

LED display lights on as shown in the above figure, and the fans and the 

compressor start operating.

• 

If the “PUMP DOWN” button is pressed while the compressor is operating, the 
compressor will stop, then start again in about 3 minutes.

(4)  LED display will change as shown below about 3 minutes after the compressor 

starts. Fully close the 3-way valve on the liquid pipe side at this stage.

POWER/ 

MODE

ERROR

PUMP  

DOWN

LOW 

NOISE

PEAK 

CUT

(L1)

(L2)

(L3)

(L4)

(L5)

(L6)

Sign “

”: Lights off, “

”: Lights on

• 

If the valve on the liquid pipe side is not closed, the pump down cannot be 

performed.

(5)  When LED display changes as shown in the below figure, close the 3-way valve on 

the gas pipe side tightly. 

POWER/ 

MODE

ERROR

PUMP  

DOWN

LOW 

NOISE

PEAK 

CUT

(L1)

(L2)

(L3)

(L4)

(L5)

(L6)

Sign “

”: Lights off, “

”: Lights on

•  If the valve on the gas pipe side is not closed, refrigerant may flow into the piping 

after the compressor stops.

Step (5)

Closing direction

Step (4)

Hexagon wrench

Liquid pipe

Gas pipe

Closing direction

(6)  LED display changes after 1 minute as shown in the figure below.

POWER/ 

MODE

ERROR

PUMP  

DOWN

LOW 

NOISE

PEAK 

CUT

(L1)

(L2)

(L3)

(L4)

(L5)

(L6)

Sign “

”: Lights off, “

”: Lights on

Fans and compressor stop automatically.

• 

If the pump down is successfully completed (the above LED display is shown), the 

outdoor unit remains stopped until the power is turned off.

(7)  Turn the power off.

POWER/ 

MODE

ERROR

PUMP  

DOWN

LOW 

NOISE

PEAK 

CUT

(L1)

(L2)

(L3)

(L4)

(L5)

(L6)

Sign “

”: Lights off

PUMP DOWN is completed.

(Note)

• 

To stop pump down, press the “PUMP DOWN” button again.

• 

To start the pump down again after the compressor is automatically stopped due to an 

error, turn the power off and open the 3-way valves. Wait 3 minutes, turn the power on 

and start the pump down again.

• 

When starting the operation after completion of the pump down, turn the power off, 

and then open the 3-way valves. Wait 3 minutes, turn the power on and perform a test 

run in the “COOL” operation mode.

• 

If an error occurs, recover the refrigerant from service port.

9379069762_IM.indb   17

3/4/2016   09:03:55

Summary of Contents for 30RLXEH

Page 1: ...IT Français Español APPAREIL EXTÉRIEUR UNIDAD EXTERIOR INSTALLATION MANUAL For authorized service personnel only MANUEL D INSTALLATION MANUAL DE INSTALACIÓN Pour le personnel d entretien autorisé uniquement Únicamente para personal de servicio autorizado ...

Page 2: ...ofessional or improper installation of the product may cause serious accidents such as injury water leakage electric shock or fire If the outdoor unit is installed in disregard of the instructions in the installation manual it will void the manufacturer s warranty Do not turn on the power until all work has been completed Turning on the power before the work is completed can cause serious accident...

Page 3: ...ual To connect the indoor unit and outdoor unit use air conditioner piping and cables available locally as standard parts This manual describes proper connections using such installation set Do not use an extension cable Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation There is no extra refrigerant in the outdoor unit for air purging Using the same vacuum pum...

Page 4: ...th R410A are as shown in the table Never use copper pipes thinner than those indicated in the table even if they are available on the market Thicknesses of Annealed Copper Pipes R410A Pipe outside diameter in mm Thickness in mm 1 4 6 35 0 032 0 80 3 8 9 52 0 032 0 80 1 2 12 70 0 032 0 80 5 8 15 88 0 039 1 00 3 4 19 05 0 047 1 20 3 3 Protection of pipes Protect the pipes to prevent the entry of moi...

Page 5: ...eaker If children under 10 years old may approach the unit take preventive measures so that they cannot reach the unit Keep the length of the piping of the indoor and outdoor units within the allowable range For maintenance purposes do not bury the piping 4 2 Drain installation CAUTION In places where the outdoor temperature drops to 32 F 0 C or lower the drain water may freeze and may stop up the...

Page 6: ... the bottom hands or fingers may be pinched Carry slowly in the manner as shown on Fig B holding the handles Fig A in right and left sides Be careful not to touch with hands or objects Be sure to hold the handles on the sides of the unit Otherwise the suction grilles on the sides of the unit may be deformed Fig A Handle Suction grille Handle Suction grille Fig B Front view Rear view 4 5 Installati...

Page 7: ... Prevent mineral oil from getting into the system as this would reduce the lifetime of the units While brazing the pipes be sure to blow dry nitrogen gas through them The maximum lengths of this product are shown in the table If the units are further apart than this correct operation cannot be guaranteed 5 3 1 Flaring Use special pipe cutter and flare tool exclusive for R410A 1 Cut the connection ...

Page 8: ...nd cause damage or injury After the installation make sure there is no refrigerant leakage If the refrigerant leaks into the room and becomes exposed to a source of fire such as a fan heater stove or burner it produces a toxic gas Do not subject the pipes to strong shocks during the sealing test It can rupture the pipes and cause serious injury CAUTION Do not block the walls and the ceiling until ...

Page 9: ...does not include the concurrent use of other devices Do not start operation until the refrigerant is charged completely The compressor will fail if it is operated before the refrigerant piping charging is complete Transmission cable between indoor unit and outdoor unit is 240 V Be sure not to remove thermistor sensor etc from power wiring and connection wiring Compressor may fail if operated while...

Page 10: ... a protection sleeve for the conduits can be inserted at the knock out hole If you do not use a wire conduit be sure to protect the wires to prevent the edge of the knock out hole from cutting the wires It is recommended to apply anti rust paint to the edge of the knock out hole Knock out holes are provided for wiring Fig A Knock out holes are provided 2 each in the same size in front lateral and ...

Page 11: ...tion for using an insulation material with equal heat transmission rate or below 0 040 W m k Relative humidity in mm Insulation material Minimum thickness in mm 70 or more 75 or more 80 or more 85 or more Pipe diameter 1 4 6 35 5 16 8 13 32 10 16 32 13 21 32 17 3 8 9 52 11 32 9 7 16 11 18 32 14 23 32 18 1 2 12 70 13 32 10 15 32 12 19 32 15 3 4 19 5 8 15 88 13 32 10 15 32 12 5 8 16 25 32 20 If the ...

Page 12: ...uring abnormal air conditioner operation 3 PUMP DOWN L1 Orange Lights on during pump down operation 4 LOW NOISE MODE L2 L3 Orange Lights on during Low noise function when field setting is activated Lighting pattern of L2 and L3 indicates low noise level See page 13 5 PEAK CUT L4 L5 L6 Orange Lights on during Peak cut function when local setting is activated Lighting pattern of L4 L5 and L6 indicat...

Page 13: ...e PEAK CUT L4 L5 L6 Level 1 Blink Level 2 Blink Sign Lights off The noise of Level 2 is lower than the one of Level 1 6 Press ENTER button SW3 and fix it PEAK CUT L4 L5 L6 Level 1 Level 2 Sign Lights off Lights on 7 Return to Operating status display Normal operation by pressing EXIT button SW4 In case of missing how many times SELECT and ENTER button are pressed restart from the beginning of oper...

Page 14: ...ction 10 1 External input 10 1 1 Wiring of connector ON OFF of the Low noise mode and Peak cut mode functions can be enabled with an external field device When installing connection cable specified part optional parts must be used Refer to section 9 2 Table Settings List for the required function The function must be set for the external input to work Input Connector No Optional parts Low noise mo...

Page 15: ...ete the outdoor units and the connected indoor units will start operating Room temperature control will not activate during test operation continuous operation If a knocking sound can be heard in the liquid compression of the compressor stop the unit immediately and then energize the crank case heater for a sufficient length of time before restarting the operation 11 2 1 Setting method on outdoor ...

Page 16: ...r Heat sink temp sensor error 2 8 4 Current sensor error Current sensor 1 error stoppage permanently 2 8 6 Pressure sensor error High pressure switch 1 error 2 8 6 Pressure sensor error 2 9 4 Trip detection Trip detection 2 9 5 Compressor motor control error Rotor position detection error stoppage permanently 2 9 7 Outdoor unit fan motor 1 error Duty error 2 9 8 Outdoor unit fan motor 2 error Duty...

Page 17: ...D display lights on as shown in the above figure and the fans and the compressor start operating If the PUMP DOWN button is pressed while the compressor is operating the compressor will stop then start again in about 3 minutes 4 LED display will change as shown below about 3 minutes after the compressor starts Fully close the 3 way valve on the liquid pipe side at this stage POWER MODE ERROR PUMP ...

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