Air Purging - Toshiba RAV-SM2244AT8-E Service Manual

Digital Inverter
Refrigerant Pipe Length
Simultaneous twin, triple
Allowable pipe length (m)
Branch piping
Total length
Outdoor • 1 + 2
• 2
unit
• 1 + 3 • 3
• 1 + 4
• 4
Maximum Maximum
SM2244 70 20
SM2804 70 20
Pipe diameter (mm)
Outdoor
Main pipe
unit
Gas side Liquid side
SM2244 Ø28.6 Ø12.7
SM2804 Ø28.6 Ø12.7
Figure of Simultaneous twin
Indoor Unit
Indoor Unit
Outdoor Unit
2
3
1
Simultaneous double twin
Allowable pipe length (m)
Branch Branch
Total length
piping piping
• 1 + 2 + 4
Outdoor
• 4 • 4 + 2
• 1 + 2 + 5
unit
• 5 • 5 + 2
• 1 + 3 + 6
• 6 • 6 + 3
• 1 + 3 + 7
• 7 • 7 + 3
Maximum
Maximum Maximum
SM2244 70 15
SM2804 70 15
Pipe diameter (mm)
Outdoor
Main pipe
unit
Gas side Liquid side
SM2244 Ø28.6 Ø12.7
SM2804 Ø28.6 Ø12.7
Figure of Simultaneous double twin
Indoor Unit
Outdoor Unit
4
EN
Height difference (m)
Branch piping Indoor-outdoor H
• 3 – 2
• 4 – 2
Indoor unit: Outdoor unit:
• 4 – 3 Upper Upper
Maximum
10 30 30
10 30 30
Number of bent
Branch piping
Gas side Liquid side
Ø15.9 Ø9.5
Ø15.9 Ø9.5
Figure of Simultaneous triple
Indoor Unit
Indoor Unit
Indoor Unit
Outdoor Unit
4
2 3
1
Height difference (m)
Branch piping Indoor-outdoor H
• ( 4 + 2) – ( 5 + 2)
• ( 4 + 2) – ( 6 + 3)
• ( 4 + 2) – ( 7 + 3)
Indoor Outdoor
• ( 5 + 2) – ( 6 + 3)
unit: unit:
• ( 5 + 2) – ( 7 + 3) Upper Upper
• ( 6 + 3) – ( 7 + 3)
Maximum
20 6 30 30
20 6 30 30
Number of bent
Branch piping
Gas side Liquid side
2, 3: Ø15.9 2, 3: Ø9.5
4, 5, 6, 7: Ø12.7 4, 5, 6, 7: Ø6.4
2 to 7: Ø15.9 2 to 7: Ø9.5
Indoor Unit
Indoor Unit Indoor Unit
5 6 7
2 3
1
13
Digital Inverter
6

AIR PURGING

Airtight Test
Before starting an airtight test, further tighten the spindle
valves on the gas side and liquid side.
Indoor-indoor
Pressurize the pipe with nitrogen gas charged from the
( h)
service port to the design pressure (4.15 MPa) to conduct
the airtight test.
0.5
After the airtight test is completed, evacuate the nitrogen
gas.
0.5
Air Purge
portions
With respect to the preservation of the terrestrial
10 or less environment, adopt "Vacuum pump" to purge air (Evacuate
air in the connecting pipes) when installing the unit.
10 or less
• 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)
Indoor-
indoor
( h)
0.5
0.5
Charge port
(Valve core (Setting pin))
Packed valve at gas side
portions
10 or less
10 or less
Vacuum pump
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.
Pressure gauge
Gauge manifold valve
Turn OFF the vacuum pump.
Handle High
Leave the vacuum pump as it is for 1 or 2 minutes, and
(Keep fully closed)
check that the indicator of the compound pressure gauge
Charge hose
does not return.
(For R410A only)
Vacuum pump adapter
for counter-flow
Open the valve stem or valve handle fully. (First, at liquid
prevention
(For R410A only)
side, then gas side)
Vacuum
pump
Disconnect the charge hose from the charge port.
Tighten the valve and caps of the charge port securely.
*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.
14 EN