Air Purging - Toshiba RAV-SM304ATP-E Installation Manual

Refrigerant pipe length
■
Single
Allowable pipe length (m)
Model
Total length L
SM30 10
SM40 10
Model
Liquid side
SM30 Ø6.4
SM40 Ø6.4
19-EN
Height difference (Indoor-outdoor H) (m)
Indoor unit: Upper Outdoor unit: Lower
10
10
Pipe diameter (mm)
Number of bent portions
Gas side
Ø9.5
Ø12.7
Figure of Single
Indoor unit
Outdoor unit
6

Air purging

Airtight test
■
Before starting an airtight test, further tighten the
spindle valves on the gas side and liquid side.
10
Pressurize the pipe with nitrogen gas charged from the
10
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
10 or less
Air purge
■
10 or less
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 pump is put in an air conditioner
including R410A, it may cause trouble with the
refrigeration cycle.)
Compound pressure gauge
–101 kPa
(–76 cmHg)
Handle Low
Charge hose
(For R410A only)
Charge port
(Valve core
(Setting pin))
– 10 –
Vacuum pump
As shown in the figure, connect the charge hose after the
Attach the connecting port of the charge hose with a
projection to push the valve core (setting pin) to the charge
Loosen the flare nut of the packed valve (Gas side) a little
to check that the air passes through. (*2)
Execute vacuuming until the compound pressure gauge
Pressure gauge
Leave the vacuum pump as it is for 1 or 2 minutes, and
check that the indicator of the compound pressure gauge
Gauge manifold
valve
Handle High
(Keep fully closed)
Open the valve stem or valve handle fully.
Charge hose
(For R410A only)
Vacuum pump adapter
for counterflow
Disconnect the charge hose from the charge port.
prevention
(For R410A only)
Tighten the valve and caps of the charge port securely.
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.
Packed valve at gas side
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.
manifold valve is closed completely.
↓
port of the set.
↓
Open Handle Low fully.
↓
Turn ON the vacuum pump. (*1)
↓
↓
Retighten the flare nut.
↓
indicates –101 kPa (–76 cmHg). (*1)
↓
Close Handle Low completely.
↓
Turn OFF the vacuum pump.
↓
does not return.
↓
(First, at liquid side, then gas side)
↓
↓
20-EN