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vac atin

After the piping has been connected to the indoor unit, you can perform the

air purge together at once.

AI PU

Evacuate the air in the connecting pipes and in the indoor unit using a

vacuum pump. Do not use the refrigerant in the outdoor unit. For details,

see the manual of the vacuum pump.

Usin a vac

Be sure to use a vacuum pump with counter-ﬂ ow prevention function so that

inside oil of the pump does not ﬂ ow backward into pipes of the air conditioner

when the pump stops.

(If oil inside of the vacuum pump enters the air conditioner, which use R32,

refrigeration cycle trouble may result.)

1. Connect the charge hose from the manifold valve to the service port of the

packed valve at gas side.

2. Connect the charge hose to the port of the vacuum pump.

3. Open fully the low pressure side handle of the gauge manifold valve.

4. Operate the vacuum pump to start evacuating. Perform evacuating for

about 15 minutes if the piping length is 20 meters. (15 minutes for 20 meters)

(assuming a pump capacity of 27 liters per minute) Then conﬁ rm that the

compound pressure gauge reading is –101 kPa (–76 cmHg).

5. Close the low pressure side valve handle of the gauge manifold valve.

6. Open fully the valve stem of the packed valves (both gas and liquid sides).

7. Remove the charging hose from the service port.

8. Securely tighten the caps on the packed valves.

Compound pressure gauge

–101 kPa

(–76 cmHg)

Handle Lo

Charge hose

Connecting pipe

Packed valve at gas side

Service port (Valve core (Setting pin))

Packed valve at liquid side

CAU I N

•

P I P

P IN

(1) Take away dust and moisture (inside of the connecting pipes).

(2) Tighten the connections (between pipes and unit).

(3) Evacuate the air in the connecting pipes using a VACUUM PUMP.

(4) Check gas leak (connected points).

(5) Be sure to fully open the packed valves before operation.

Pressure gauge

Manifold valve

Handle Hi

(Keep full closed)

Charge hose

Vacuum pump adapter for

counter-ﬂ ow prevention

Vacuum

pump

PIPIN

Pac ed valve handlin

• Open the valve stem all the way out, but do not try to open it beyond the

stopper.

Pi e si e o Pac ed alve

12.70 mm and smallers

15.88 mm

• Securely tighten the valve cap with torque in the following table:

i e

H17 - H19

Valve Rod Cap

H22 - H30

H14

Service Port Cap

H17

Hexagon wrench

is required.

Service Port Cap

Valve Rod Cap

reca tions

i e o

e a on

rench

A = 4 mm

A = 5 mm

14~18 N·m

(1.4 to 1.8 kgf·m)

33~42 N·m

(3.3 to 4.2 kgf·m)

8~12 N·m

(0.8 to 1.2 kgf·m)

14~18 N·m

(1.4 to 1.8 kgf·m)