Chariot Carriers Merci Installation Manual download pdf (Page 35)

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68-EN67-EN

Refrigerant pipe length

Single

Model

Allowable pipe length (m) Height difference (Indoor-outdoor H) (m)

Total length L Indoor unit: Upper

Outdoor unit: Lower

SM56 030303

SM80 030303

Model

Pipe diameter (mm)

Number of bent portions

Liquid side Gas side

SM56 ssel ro 017.21Ø4.6Ø

SM80 ssel ro 019.51Ø5.9Ø

Indoor unit

Outdoor unit

Figure of Single

Air purging

Airtight test

Before starting an airtight test, further tighten the

spindle valves on the gas side and liquid side.

Pressurize the pipe with nitrogen gas charged from the

service port to the design pressure (4.15 Mpa) to

conduct the airtight test. Perform gas leak checks using

a leak tester for the HFC refrigerant.

After the airtight test is completed, evacuate the

nitrogen gas.

Air purge

With respect to the preservation of the terrestrial

environment, adopt “Vacuum pump” to purge air

(Evacuate air in the connecting pipes) when installing

the unit.

 Do not discharge the refrigerant gas to the

atmosphere to preserve the terrestrial environment.

 Use a vacuum pump to discharge the air (nitrogen,

etc.) that remains in the set. If air remains, the

capacity may decrease.

For the vacuum pump, be sure to use one with a

backflow preventer so that the oil in the pump does not

backflow into the pipe of the air conditioner when the

pump stops.

(If oil in the vacuum pu

mp is put in an air conditioner

including R410A, it may cause trouble with the

refrigeration cycle.)

Vacuum pump

*1: Use the vacuum pump, vacuum pump adapter, and gauge

manifold correctly referring to the manuals supplied with each

tool before using them.

Check that the vacuum pump oil is filled up to the specified line

of the oil gauge.

*2: When air is not charged, check again whether the connecting

port of the discharge hose, which has a projection to push the

valve core, is firmly connected to the charge port.

Pressure gauge

Compound pressure gauge

–101 kPa

(–76 cmHg)

Handle Low

Charge hose

(For R410A only)

Charge port

(Valve core

(Setting pin))

Gauge manifold

valve

Handle High

(Keep fully closed)

Charge hose

(For R410A only)

Vacuum pump adapter

for counterflow

prevention

(For R410A only)

Vacuum

pump

Packed valve at gas side

As shown in the figure, connect the charge hose after the

manifold valve is closed completely.

Attach the connecting port of the charge hose with a

projection to push the valve core (setting pin) to the charge

port of the

set.

Open Handle Low fully.

Turn ON the vacuum pump. (*1)

Loosen the flare nut of the packed valve (Gas side) a little

to check that the air passes through. (*2)

Retighten the flare nut.

Execute vacuuming until the compound pressure gauge

indicates –101 kPa (–76 cmHg). (*1)

Close Handle Low completely.

Turn OFF the vacuum pump.

Leave the vacuum pump as it is for 1 or 2 minutes, and

check that the indicator of the compound pressure gauge

does not return.

Open the valve stem or valve handle fully.

(First, at liquid side, then gas side)

Disconnect the charge hose from the charge port.

Tighten the valve and caps of the charge port securely.

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Chariot Carriers Merci Installation Manual Page 35

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