Mitsubishi Electric SUZ-SM35VA Technical & Service Manual page 20

MAX. REFRIGERANT PIPING LENGTH
Service ref.
SUZ-SM35VA.TH
SUZ-SM50VA.TH
SUZ-SM60VA.TH
MAX. HEIGHT DIFFERENCE
ADDITIONAL REFRIGERANT CHARGE (R32: g)
Service ref.
SUZ-SM35VA.TH
Service ref.
SUZ-SM50VA.TH
SUZ-SM60VA.TH
Pumping Down
When relocating or disposing of the air conditioner, pump down the system by following the procedure below so that no
refrigerant is released into the atmosphere.
1 Turn off the power supply (circuit 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 Supply power (circuit breaker).
5 Perform the refrigerant collecting operation (cooling test run).
• For the PAR-4xMAA ("x" represents 0 or later), select "Service" → "Test Run" from the main menu to start the test run, and then
select the cooling mode.
• For details or for other information about starting the test run when using remote controllers, refer to the installation manual
for the indoor unit or the remote controller.
6 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/cm²) and quickly stop the air conditioner.
• Push the "ON/OFF" button on the remote controller to stop the air conditioner.
Note:
When the extension piping is very long with a large refrigerant amount, it may not be possible to perform a pump down
operation. In this case, use refrigerant recovery equipment to collect all of the refrigerant in the system.
7 Turn off the power supply (circuit breaker), remove the gauge manifold valve, and then disconnect the refrigerant pipes.
.Warning: When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
• If the refrigerant pipes are disconnected while the compressor is operating and the stop valve (ball valve) is open,
the pressure in the refrigeration cycle could become extremely high if air is drawn in, causing the pipes to burst,
personal injury, etc.
• Do not perform pump down work when there is a gas leak. The intake of air or other gases causes abnormally high
pressure in the refrigeration cycle, which may cause explosion or injury.
OCH779
Refrigerant piping: m
Max. Length A
20
30
Indoor
unit
* Max. Height
difference
B
Refrigerant piping length (one way)
Outdoor unit
precharged 7 m
900 0
Calculation: Xg=20g/m×(Refrigerant piping length(m)−7)
Outdoor unit
precharged 7 m
1,200 0
1,250 0
Max. Height difference B
12
30
Max. Length
A
Outdoor unit
10 m 15 m
60 160
Refrigerant piping length (one way)
10 m 15 m
60 160
60 160
Calculation: Xg=20g/m×(Refrigerant piping length(m)−7)
20
Piping size O.D: mm
Gas Liquid
9.52
12.7 6.35
15.88
* Height difference limitations are binding
regardless of the height position at which
either indoor or outdoor is placed higher.
20 m
260
20 m 25 m
260 360
260 360
30 m
460
460