Special Functions; System Control; Specifications - Mitsubishi Electric PUHZ-SW AA Série Manuel D'installation

9. Special Functions

9.1. Refrigerant collecting (pump down)
Perform the following procedures to collect the refrigerant when moving the indoor
unit or the outdoor unit.
1 Supply power (circuit breaker).
* When power is supplied, make sure that "CENTRALLY CONTROLLED" is not
displayed on the remote controller. If "CENTRALLY CONTROLLED" is dis-
played, the refrigerant collecting (pump down) cannot be completed normally.
* Start-up of the indoor-outdoor communication takes about 3 minutes after the
power (circuit breaker) is turned on. Start the pump-down operation 3 to 4
minutes after the power (circuit breaker) is turned ON.
* In the case of multi-units control, before powering on, disconnect the wiring
between the master indoor unit and the slave indoor unit. For more details
refer to the installation manual for the indoor unit.
2 After the liquid stop valve is closed, set the SWP switch on the control board of
the outdoor unit to ON. The compressor (outdoor unit) and ventilators (indoor and
outdoor units) start operating and refrigerant collecting operation begins. LED1
and LED2 on the control board of the outdoor unit are lit.
* Only set the SWP switch (push-button type) to ON if the unit is stopped. How-
ever, even if the unit is stopped and the SWP switch is set to ON less than 3
minutes after the compressor stops, the refrigerant collecting operation cannot
be performed. Wait until compressor has been stopped for 3 minutes and then
set the SWP switch to ON again.

10. System control

Set the refrigerant address using the DIP switch of the outdoor unit.
SW1 Function Setting
Refrigerant
SW1 Setting
address
ON ON
00
OFF OFF
3 4 5 6 7
ON ON
01
OFF OFF
3 4 5 6 7
ON ON
02
OFF OFF
3 4 5 6 7

11. Specifications

Outdoor model
Power supply V / Phase / Hz
Dimensions (W x H x D) mm
Sound Power Level *1
dB(A)
(Heating)
*1 Measured under rated operation frequency.
Refrigerant
SW1 Setting
address
03
3 4 5 6 7
04
3 4 5 6 7
05
3 4 5 6 7
PUHZ- PUHZ-
SW75VAA SW100VAA
230 / Single / 50
58 60
3 Because the unit automatically stops in about 2 to 3 minutes when the refrigerant
collecting operation is completed (LED1 off, LED2 lit), be sure to quickly close
the gas stop valve. If LED1 is lit and LED2 is off and the outdoor unit is stopped,
refrigerant collection is not properly performed. Open the liquid stop valve com-
pletely, and then repeat step 2 after 3 minutes have passed.
* If the refrigerant collecting operation has been completed normally (LED1 off,
LED2 lit), the unit will remain stopped until the power supply is turned off.
4 Turn off the power supply (circuit breaker).
* Note that when the extension piping is very long with large refrigerant amount,
it may not be possible to perform a pump-down operation. When performing
the pump-down operation, make sure that the low pressure is lowered to near
0 MPa (gauge).
Warning:
When pumping down the refrigerant, stop the com-
pressor before disconnecting the refrigerant pipes.
The compressor may burst if air etc. get into it.
Note:
a) Up to 6 units can be connected.
b) Select one single model for all units.
c) For Dip switch setting for indoor unit, refer to the indoor unit's installation
manual.
PUHZ- PUHZ- PUHZ-
SHW80VAA SHW112VAA SW75YAA
1050 x 1020 x 480
59 60
PUHZ- PUHZ-
SW100YAA SHW80YAA
400 / Three / 50
58 60 59
PUHZ-
SHW112YAA
60
13