Digital Inverter
Refrigerant Pipe Length
Simultaneous twin, triple
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| Allowable pipe length (m) |
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| Height difference (m) | ||||||
Outdoor | Total length | Branch piping | Branch piping |
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• | 1 + | 2 | • | 2 | • | 3 – | 2 |
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unit | • | 1 + | 3 | • | 3 | • | 4 – | 2 | Indoor unit: | Outdoor unit: | ||
(∍h) | ||||||||||||
| • | 1 + | 4 | • | 4 | • | 4 – | 3 | Upper | Upper | ||
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| Maximum | Maximum | Maximum |
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SM2244 |
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| 70 |
| 20 |
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| 10 | 30 | 30 | 0.5 | |
SM2804 |
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| 70 |
| 20 |
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| 10 | 30 | 30 | 0.5 | |
Outdoor |
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| Pipe diameter (mm) |
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| Number of bent | ||||
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| Main pipe |
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| Branch piping | |||||
unit |
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| portions | |||||
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| Gas side |
| Liquid side |
| Gas side | Liquid side | |||||
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SM2244 |
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| Ø28.6 |
| Ø12.7 |
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| Ø15.9 |
| Ø9.5 | 10 or less | |
SM2804 |
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| Ø28.6 |
| Ø12.7 |
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| Ø15.9 |
| Ø9.5 | 10 or less | |
Digital Inverter
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 service port to the design pressure (4.15 MPa) to conduct the airtight test.
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 |
Vacuum pump
As shown in the figure, connect the charge hose after the
manifold valve is closed completely.
L
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.
L
Open Handle Low fully.
L
Turn ON the vacuum pump. (*1)
L
–
Figure of Simultaneous twin
Indoor Unit
Indoor Unit
Outdoor Unit 
2 | 3 | H |
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1
Figure of Simultaneous triple
| Indoor Unit |
Indoor Unit | Indoor Unit |
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Outdoor Unit | 4 |
2 | 3 |
| 1 |
H
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.)
Loosen the flare nut of the packed valve (Gas side) a little to check that the air passes through. (*2)
L
Retighten the flare nut.
L
Execute vacuuming until the compound pressure gauge
indicates
L
103
Compound pressure gauge
Pressure gauge
Close Handle Low completely.
–
Simultaneous double twin
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| Allowable pipe length (m) |
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| Height difference (m) | ||||||
| Total length |
| Branch | Branch | Branch piping |
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| • ( | 4 + | 2) – ( | 5 + | 2) |
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| piping | piping |
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Outdoor | • | 1 + | 2 + | 4 | • ( | 4 + | 2) – ( | 6 + | 3) |
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• | 4 | • | 4 + | 2 |
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unit | • | 1 + | 2 + | 5 | • | 5 | • | 5 + | 2 | • ( | 4 + | 2) – ( | 7 + | 3) | Indoor | Outdoor | indoor |
| • | 1 + | 3 + | 6 | • | 6 | • | 6 + | 3 | • ( | 5 + | 2) – ( | 6 + | 3) | unit: | unit: | (∍h) |
| • | 1 + | 3 + | 7 | • | 7 | • | 7 + | 3 | • ( | 5 + | 2) – ( | 7 + | 3) | Upper | Upper |
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| Maximum |
| Maximum | Maximum | • ( | 6 + | 3) – ( | 7 + | 3) |
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| Maximum |
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SM2244 |
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| 70 |
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| 15 |
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| 20 |
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| 6 |
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| 30 | 30 | 0.5 |
SM2804 |
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| 70 |
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| 15 |
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| 20 |
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| 6 |
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| 30 | 30 | 0.5 |
Outdoor |
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| Pipe diameter (mm) |
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| Number of bent | ||||
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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
(For R410A only)
Vacuum
pump
L
Turn OFF the vacuum pump.
L
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.
L
Open the valve stem or valve handle fully. (First, at liquid
side, then gas side)
L |
Disconnect the charge hose from the charge port. |
L |
unit |
| Main pipe |
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| Branch piping |
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| portions | |||
Gas side | Liquid side |
| Gas side |
| Liquid side | |||||||
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SM2244 | Ø28.6 | Ø12.7 |
| 2, | 3: Ø15.9 |
| 2, | 3: Ø9.5 | 10 or less | |||
4, | 5, | 6, | 7: Ø12.7 | 4, | 5, | 6, | 7: Ø6.4 | |||||
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SM2804 | Ø28.6 | Ø12.7 |
| 2 to | 7: Ø15.9 |
| 2 to | 7: Ø9.5 | 10 or less | |||
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| Figure of Simultaneous double twin | Indoor Unit |
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| Indoor Unit |
| Indoor Unit |
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| Indoor Unit |
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| Outdoor Unit |
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| 4 |
| 5 |
| 6 |
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| 7 |
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| H |
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| 1 |
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Packed valve at gas side
| 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 |
*2 | of the oil gauge. |
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.
EN | 13 |
| 14 | EN |
