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5) Vacuuming from liquid pipe and gas pipe at the same time.

Special vacuum dry procedure (this vacuum dry method is used if there s mois-

ture when  ushing the refrigerant pipe or rainwater may enter into the pipe):

1) Vacuum dry (for the  rst time) — connect the all-purpose detector to the inlet

of liquid pipe and gas pipe, and run the vacuum pump more than two hours (the

vacuum pump should be below –755mmHg).

2) Fill nitrogen to 0.5Kgf/cm

. Because nitrogen is for drying gas, it has vacuum

drying e ect during vacuum destroy. But if the moisture is too much, this me-

thod can t dry thoroughly. So, please pay more attention to prevent water entering

and forming condensation water.

3) Run the vacuum pump more than one hour (the vacuum pump should be

below –755mmHg). If the pump can’t achieve –755mmHg after pumping two

hours, repeat procedure 2 and 3.

4) Vacuum placement test: place 1 hour when it achieves –755mmHg, pass if the

vacuum watch shows no rising. If it rises, it shows there’s moisture or leakage

point.

7.3.4. Additional refrigerant charge

Refrigerant cannot be charged until  eld wiring has been completed.

Refrigerant may only be charged after performing the leak test and the vacuum

pumping.

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 is charged.

Always use protective gloves and protect your eyes when charging refrigerant.

The outdoor unit is factory charged with refrigerant. Calculate the added re-

frigerant according to the diameter and the length of the liquid side pipe of the

outdoor unit/indoor unit.

Table 7.3.4.

D(mm)

L(m)

∅6.4 ∅9.5 ∅12.7

Less than 5m — — —

Over 5 m 11 g/m 30 g/m 60 g/m

Remark:

L (m): The length of the refrigerant pipe (one-way)

D (mm): Liquid side piping diameter