Fujitsu AOYG36LATT Installation Manual Download Page 9

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5.7. Additional charging

CAUTION

After vacuuming the system, add refrigerant.
Do not reuse recovered refrigerant.
When charging the refrigerant R410A, always use an electronic scales for refrigerant

charging (to measure the refrigerant by weight). Adding more refrigerant than the

specified amount will cause a malfunction.
When charging the refrigerant, take into account the slight change in the composition

of the gas and liquid phases, and always charge from the liquid phase side whose

composition is stable. Adding refrigerant through the gas pipe will cause a malfunction.
Check if the steel cylinder has a siphon installed or not before filling. (There is an

indication “with siphon for filling liquid” on the steel cylinder.)

Filling method for cylinder with siphon

R410A

Gas

Liquid

Set the cylinder vertical and fill with the liquid.

(Liquid can be filled without turning bottom up with the

siphon inside.)

Filling method for other cylinders

R410A

Gas

Liquid

Turn bottom up and fill with liquid.

(Be careful to avoid turning over the cylinder.)

Be sure to use the special tools for R410A for pressure resistance and to avoid mixing

of impure substances.
If the units are further apart than the maximum pipe length, correct operation can not be

guaranteed.
Make sure to back closing valve after refrigerant charging. Otherwise, the compressor

may fail.

Minimize refrigerant release to the air. Excessive release is prohibited under the Freon

Collection and Destruction Law.

5.7.1. For Pre-charge length

Refrigerant pipe size

Piping length (L) *Pre-Charge [m]

Standard

Size up (Liquid pipe)

5.7.2. If additional refrigerant is required

When the piping is longer than Pre-charge length, additional charging is necessary.

•

For the additional amount, see the table below.

•

Additional charging amount
Single type

L1 (*1) > Pre-charge length

Refrigerant pipe size

[mm (in.)]

Piping length

Standard

~30 m

40 m

50 m

60 m

70 m

g/m

Liquid

9.52 (3/8)

None

500 g

1,000 g 1,500 g 2,000 g 50 g/m

Gas

15.88 (5/8)

Size up

~30 m

40 m

50 m

g/m

Liquid

9.52 (3/8)

None

500 g

1,000 g

50 g/m

Gas

19.05 (3/4)

~15 m

25 m

35 m

g/m

Liquid

12.70 (1/2)

None

1,000 g 2,000 g

100 g/m

Gas

15.88 (5/8)
19.05 (3/4)

*1: Refer to “View” in the table of “4.3.1. Single type installation”.

Simultaneous operation multi type

Twin : L1+L2+L3 (*2) > Pre-charge length

Triple : L1+L2+L3+L4 (*3) > Pre-charge length

*2 : Refer to “View” in the table of “4.3.2. Simultaneous operation multi type installation.”
*3 : Refer to “View” in the table of “4.3.2. Simultaneous operation multi type installation.”

The additional charging amount for twin / triple type will be calculated as follows:

Additional charging amount (g)

= (A x 100) + (B x 50) + (C x 30) - 1,500
• A = Piping length (m) of liquid pipe [12.70 mm (1/2 in.)]

• B = Piping length (m) of liquid pipe [9.52 mm (3/8 in.)]

• C = Piping length (m) of liquid pipe [6.35 mm (1/4 in.)]

CAUTION

Use a clean gauge manifold and charging hose that were designed specifically for use

with R410A. Using the same vacuum equipment for different refrigerants may damage

the vacuum pump or the unit.

Do not purge the air with refrigerants, but use a vacuum pump to evacuate the system.

(1) Check that the valves are closed by removing the blank caps from the gas and

liquid pipes.