Max. Refrigerant Piping Length; Max. Height Difference; Additional Refrigerant Charge; Pumping Down - Mitsubishi Electric SUZ-M25VA Technical & Service Manual

MAX. REFRIGERANT PIPING LENGTH

Model
SUZ-M25VA(-ET)
SUZ-M35VA(-ET)
SUZ-M50VA(-ET)
SUZ-M60VA(-ET)
SUZ-M71VA(-ET)

MAX. HEIGHT DIFFERENCE

Indoor
unit
* Max. Height
* Height difference limitations are binding regardless of the height position at which either indoor or outdoor is placed higher.
ADDITIONAL REFRIGERANT CHARGE (R32: g)
Outdoor unit
Model
SUZ-M25VA(-ET)
SUZ-M35VA(-ET)
Outdoor unit
Model
SUZ-M50VA(-ET)
SUZ-M60VA(-ET)
Model
SUZ-M71VA(-ET)

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-3xMAA ("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.
OCH684
Refrigerant piping: m
Max. Length A Max. Height difference B
20
30
difference
B
Max. Length
A
Refrigerant piping length (one way)
precharged
7 m
650 0
900 0
precharged
7 m
1,200 0
1,250 0
Outdoor unit
precharged
7 m
1,450 0
12
30
Outdoor unit
10 m 15 m 20 m
60 160 260
60 160 260
Calculation: Xg=30g/m×(Refrigerant piping length(m)−7)
Refrigerant piping length (one way)
10 m 15 m
60 160
60 160
Calculation : Xg=20g/m×(Refrigerant piping length(m)−7)
Refrigerant piping length (one way)
10 m 15 m
120 320
Calculation : Xg=55g/m×(Refrigerant piping length(m)−7)
22
Piping size O.D: mm
Gas Liquid
9.52
6.35
12.7
15.88
9.52
20 m 25 m
260 360
260 360
20 m 25 m
520 720
30 m
460
460
30 m
920