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1
Installation of outdoor
1 - 8 Refrigerant piping
1 - 8 - 8
Additional refrigerant charge
C
AUTION
Refrigerant cannot be charged until field wiring has been completed.
Refrigerant may only be charged after performing the leak test and the vacuum drying.
When charging a system, care shall be taken that its maximum permissible charge is never exceeded, in view of the danger of liquid hammer.
Charging with an unsuitable substance may cause explosions and accidents, so always ensure that the appropriate refrigerant (R410A) is charged.
Refrigerant containers shall be opened slowly.
Always use protective gloves and protect your eyes when charging refrigerant.
•
This outside unit is factory charged with refrigerant and depending on pipe sizes and pipe lengths some systems require additional charging of
refrigerant.
•
Determine the amount of refrigerant to be added by referring to the table, write it down on the included "Added
Refrigerant" plate and attach it to the rear side of the front cover.
N
OTE
Refer to the example of connection for the amount to be added.
Additional refrigerant charge procedure (1)-normally
•
Charge the refrigerant to the liquid pipe in its liquid state. Since R410A is a mixed refrigerant, its composition changes if charged in a state of gas
and normal system operation would no longer be assured.
•
Make sure to use installation tools you exclusively use on R410A installations to withstand the pressure and to prevent foreign materials from
mixing into the system.
1
Before charging, check whether the tank has a siphon attached or not.
How to charge with a siphon attached tank.
Charge with the tank upright.
There is a siphon tube
inside, so there is no need to
turn the tank upside-down.
How to charge with other tank.
Charge with the tank upside-down.
2
After the vacuum drying is finished, charge the additional refrigerant in its liquid state through the liquid shutoff valve service port.
Taking into account following instructions:
•
Check that gas and liquid shutoff valves are closed.
•
Stop the compressor and charge the specified weight of refrigerant.
(If the outside unit is not in operation and the total amount cannot be charged, follow the Additional refrigerant charge procedure (2) shown
below.)
• Installation procedure
®
• VRV
Systems • Installation procedure
27
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