Under Ceiling Type | Installation Manual |
4 REFRIGERANT PIPING AND EVACUATING
Refrigerant Piping
•The connecting sections of the refrigerant pipes are provided at the positions in the figure below.
Upper side | Rear side | * When using the drain |
pump kit sold separately, | ||
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Right |
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1.Use copper pipe with 0.03” (0.8 mm) or more thickness.
(In case pipe size is Ø5/8” (15.9 mm), with 0.04” (1.0 mm) or more.)
2.Flare nut and flare works are also different from those of the conventional refrigerant.
Take out the flare nut attached to the main unit of the air conditioner, and use it.
REQUIREMENT
When the refrigerant pipe is long, provide support brackets at intervals of 8’2” - 9’10” (2.5 - 3 m) to clamp the refrigerant pipe. Otherwise, abnormal sound may be generated.
CAUTION
1.Remove dust and moisture from the inside of the connecting pipes.
2.Tight connection (between pipes and unit)
3.Evacuate the air in the connecting pipes using
VACUUM PUMP.
4.Check the gas leakage. (Connected points)
Pipe size
Model |
| SP180 | SP240, SP300, | |
RAV- | SP360, SP420 | |||
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| Gas side | 1/2" | 5/8" | |
| (12.7 mm) | (15.9 mm) | ||
Pipe size |
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Liquid side | 1/4" | 3/8" | ||
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| (6.4 mm) | (9.5 mm) | ||
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Permissible Piping Length and Height Difference
They vary according to the outdoor unit.
For details, refer to the Installation Manual attached to the outdoor unit.
Flaring
•Cut the pipe with a pipe cutter. Remove burrs completely.
Remaining burrs may cause gas leakage.
•Insert a flare nut into the pipe, and flare the pipe. As the flaring sizes of R410A differ from those of refrigerant R22, the flare tools newly manufactured for R410A are recommended.
However, the conventional | B |
tools can be used by adjusting |
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projection margin of the |
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copper pipe. |
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▼Projection margin in
flaring: B (Unit: in (mm))
Rigid (Clutch type)
Outer dia. of | R410A tool used | Conventional | |||
copper pipe | tool used | ||||
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1/4” - 5/8” | 0 - 0.02” |
| 0.04” - 0.06” | ||
(6.4 - 15.9) | (0 - 0.5) |
| (1.0 - 1.5) | ||
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Outer dia. of copper pipe |
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1/4” (6.4) or 3/8” (9.5) | 0.06” - 0.08” (1.5 - 2.0) | ||||
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1/2” (12.7) or 5/8” (15.9) |
| 0.08” - 0.1” (2.0 - 2.5) | |||
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▼Flaring dia. meter size: A (Unit: in (mm))
Outer dia. of copper pipe | |
1/4” (6.4) | 0.36” (9.1) |
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3/8” (9.5) | 0.52” (13.2) |
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1/2” (12.7) | 0.65” (16.6) |
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5/8” (15.9) | 0.78” (19.7) |
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* In case of flaring for R410A with the |
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conventional flare tool, pull it out approx. |
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0.02” (0.5 mm) more than that for R22 to |
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adjust to the specified flare size. |
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The copper pipe gauge is useful for |
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adjusting projection margin size. |
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– 11 – |
