Mitsubishi Electric PXZ-4F75VG Manual De Instalación página 17

5. 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.
When a Cylinder unit or Hydrobox is connected with the outdoor unit, select the asterisks (**) to deactivate the freeze stat function using a remote controller.
For the setting method of the freeze stat function, refer to the service manual of the Cylinder unit or the Hydrobox.
1) Turn off the breaker for outdoor unit and Cylinder unit / Hydrobox / DHW tank both.
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 2 for SW2.
5) Turn on the breaker for outdoor unit and Cylinder unit / Hydrobox / DHW tank both.
6) After confirming that all the indoor units have stopped for more than 3 minutes, press and hold the SW871 on the control board for 3 seconds.
• After pressing the SW871, the compressor starts operating, and the outdoor fan starts running.
• The connected indoor unit starts cooling. Also, the Cylinder unit / Hydrobox / DHW tank indoor unit starts cold-water operation.
• The LED on the control board shows pumping down function.
7) When the pressure gauge shows 0.05 to 0 MPa [Gauge] (approx. 0.5 to 0 kgf/cm
outdoor unit.
8) Press and hold the SW871 on the control board again for 3 seconds.
• After pressing the SW871, the compressor and the outdoor fan stop.
LED indication during pumping down:
LED1 LED2 LED3
(Red) (Yellow) (Green)
Not Lit Not Lit 3 times
* The air conditioner automatically stops when the maximum operation time elapses or abnormality occurs. If the air conditioner stops in the middle of the
work, perform the above procedure from 1) again.
* If too much refrigerant has been added to the air conditioner system, the pressure may not drop to 0.05 MPa [Gauge] (approx. 0.5 kgf/cm
tion.
If this occurs, use a refrigerant collecting device to collect all of the refrigerant in the system, and then recharge the system with the correct amount of
refrigerant after the indoor and outdoor units have been relocated.
9) Turn off the breaker for outdoor unit and Cylinder unit / Hydrobox / DHW tank both. Remove the pressure gauge and the refrigerant piping.
10) Turn off 2 for SW2. Restore other settings that have been changed.
This function does not operate when the outside temperature is 0°C or below.
When the refrigeration circuit has a leak, do not execute pump down with the compressor.
When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
If the refrigerant pipe are disconnected while the compressor is running and the stop valve is open, air
could be drawn in and the pressure in the refrigeration cycle could become abnormally high.
The compressor may burst and cause injury if any foreign substance, such as air, enters the pipes.
), fully close the stop valve on the gas pipe side of the
2
SW2
ON
1 2 3 4 5 6
WARNING
LED
SW871
en
), or the protec-
2
15