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6-3. Tools

6-3-1. Required Tools

Refer to the “4. Tools”

6-4. Recharging of Refrigerant

When it is necessary to recharge refrigerant, charge the specified amount of new refrigerant according to the

following steps.

(INDOOR unit) (Liquid side)
Refrigerant cylinder
(With siphon pipe)
Check valve
(Gas side)
Open/Close valve
for charging
Electronic balance for refrigerant charging
Opened
(OUTDOOR unit)
Closed
Service port
Connect the charge hose to packed valve service port
at the outdoor unit’s gas side.
Recover the refrigerant, and check no refrigerant
remains in the equipment.
(For refrigerant charging, see the figure below.)
Connect the charge hose of the vacuum pump adapter.
Open fully both packed valves at liquid and gas sides.
Place the handle of the gauge manifold Low in the fully
opened position, and turn on the vacuum pump’s power switch.
Then, evacuating the refrigerant in the cycle.
When the compound gauge’s pointer has indicated
–0.1 Mpa (–76 cmHg), place the handle Low in the
fully closed position, and turn off the vacuum
pump’s power switch.
Keep the status as it is for 1 to 2 minutes, and
ensure that the compound gauge’s pointer
does not return.
Set the refrigerant cylinder to the electronic balance,
connect the connecting hose to the cylinder and
the connecting port of the electronic balance, and
charge liquid refrigerant.
1) Never charge refrigerant exceeding the specified amount.
2) If the specified amount of refrigerant cannot be charged, charge refrigerant bit by bit in COOL mode.
3) Do not carry out additional charging.
When additional charging is carried out if refrigerant leaks, the refrigerant composition changes in the refrigera-
tion cycle, that is characteristics of the air conditioner changes, refrigerant exceeding the specified amount is
charged, and working pressure in the refrigeration cycle becomes abnormally high pressure, and may cause a
rupture or personal injury.

Fig. 6-4-1 Configuration of refrigerant charging