Air Purging - Toshiba RAV-SM1603AT-E1 Installation Manual

Refrigerant Pipe Length
Single
Allowable pipe length (m)
Total length L
50
Pipe diameter (mm)
Gas side
Ø15.9
Simultaneous twin, triple
Allowable pipe length (m)
Distributed
Total length
pipes
• 1 + 2
System
• 2
• 1 + 3
• 3
• 1 + 4
• 4
Maximum
Maximum
TWIN 50 15
TRIPLE 50 15
System Main pipe
Gas side Liquid side
TWIN Ø15.9 Ø9.5
TRIPLE Ø15.9 Ø9.5
Figure of Single Figure of Simultaneous twin
Indoor Unit
Indoor Unit
Outdoor Unit Outdoor Unit
EN-25
Height difference (Indoor-outdoor H) (m)
Indoor unit: Upper Outdoor unit: Lower
30
Number of bent portions
Liquid side
Ø9.5
Height difference (m)
Distributed Indoor-outdoor H
pipes
• 3 – 2
Indoor unit: Outdoor unit:
• 4 – 2
Upper Upper
• 4 – 3
Maximum
10 30 30
10 30 30
Pipe diameter (mm)
Branching pipe
Gas side Liquid side
Ø15.9 Ø9.5
Ø12.7 Ø6.4
Figure of Simultaneous triple
Indoor Unit
Indoor Unit
Indoor Unit
Distributor
Outdoor Unit
2
3
2
1
1
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6

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
30
service port to the design pressure (4.15 MPa) to
conduct the airtight test.
After the airtight test is completed, evacuate the nitrogen
gas.
10 or less
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.
Indoor-indoor
• Use a vacuum pump to discharge the air (nitrogen,
(Δh)
etc.) that remains in the set. If air remains, the capacity
may decrease.
For the vacuum pump, be sure to use one with a
0.5
backflow preventer so that the oil in the pump does not
0.5 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
Number of bent
refrigeration cycle.)
portions
Compound pressure gauge
10 or less
–101 kPa
10 or less (–76 cmHg)
Handle Low
Charge hose
(For R410A only)
Indoor Unit
4
Charge port
(Valve core
3
(Setting pin))
Distributor
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
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 indicates –101 kPa (–76 cmHg). (*1)
Pressure gauge
Gauge manifold valve
Handle High
(Keep fully closed)
Leave the vacuum pump as it is for 1 or 2 minutes, and
Charge hose check that the indicator of the compound pressure
(For R410A only)
Vacuum pump
adapter for counter-
flow prevention
Open the valve stem or valve handle fully. (First, at
(For R410A only)
Vacuum
pump
Disconnect the charge hose from the charge port.
Packed valve at gas side
Tighten the valve and caps of the charge port securely.
charge port of the set.
Open Handle Low fully.
Turn ON the vacuum pump. (*1)
Retighten the flare nut.
Close Handle Low completely.
Turn OFF the vacuum pump.
gauge does not return.
liquid side, then gas side)
EN-26