Panasonic 2WAY Multi U-16GE3E5 Manuel D'installation page 17

Pressure reducing valve
Pressure gauge
Refringerant
container
R410A
Weight scale
 When checking for air/vacuum tightness, do so at all service ports at the same time. (With all the valves to
the outdoor units closed.)
Always use nitrogen when performing air tightness checks.
(Oxygen, carbon dioxide or refrigerant may not be used)
When performing air tightness checks on the tubes between indoor/outdoor units, we recommend doing so
on the tubes independently, prior to connecting outdoor units.
 After the airtightness test is completed, apply vacuum of 667 Pa (-755 mmHg, 5 Torr) or below to the
indoor unit and tubing.
 Do not leave for a long period of time after the vacuum state has been reached.
There is a check valve at each service port.
* With a 3WAY Multi system, there will be 3 tubes. Treat each of the tubes in the same way.
3-5. Compressor oil charge
• When using in W Multi, add compressor oil when vacuuming.
• Insert compressor oil from the gas tube side that was mounted for vacuuming, and perform vacuuming
from the liquid tube side.
• After adding the specified amount of oil, close the valve on the gas tube side, and continue vacuuming.
Table 5
Type
45.0 kW
56.0 kW
71.0 kW
85.0 kW
• Perform before turning on the power of the indoor and outdoor units.
The expansion valve of the indoor unit will be closed.
• If the power is already turned on, perform Test Run Settings "V open" (
before adding the compressor oil.
3-6. Refrigerant charge
Calculation of amount of additional refrigerant charge
• Table 7 shows the refrigerant charge at factory shipping time. Additional refrigerant must be added
according to the size and length of the tubing. If a water heat exchanger unit is installed, provide an
additional refrigerant charge for the connecting line portion. (Use the values in Table 6 to calculate liquid
tube size and length.)
Siphon tube
Vacuum pump
Container for adding compressor oil
Fig. 17
Added compressor oil
amount (kg)
3.1
3.1
2.0
2.0
EN - 17
Liquid tube
Gas tube
) in Test Run item 13