3. tools, 4. recharging of refrigerant – Toshiba CARRIER RAV-SP300AT2-UL User Manual

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6-3. Tools

6-3-1. Required Tools

Refer to the “4. Tools” (Page 8)

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


(OUTDOOR unit)


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
–101 kpa (–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

refrigeration 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