7 EVACUATING
Valve unit
Handle
Pull out the handle and using cutting pliers, etc. turn it counterclockwise by 90˚. (Open fully)
Charge port
Flare nut
Valve unit
Push in handle.
Charge port
Flare nut
Handle position
Handle
Opened fully | Closed completely |
*1. Use the vacuum pump, vacuum pump adapters,
and gauge manifold referring to the manuals attached to each tool before using them. For the vacuum pump, check oil is filled up to the specified line of the oil gauge.
*2. While the air is purged, check again that the connecting port of charge hose, which has a projection to push the valve core, is firmly con- nected to the charge port.
Valve handling precautions
•Open the valve stem or the handle until it strikes the stopper. It is unnecessary to apply further force.
•Securely tighten the cap with a torque wrench.
•Cap tightening torque
| Ø6.4 | 14 to 18N•m (1.4 to 1.8kgf•m) |
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Valve | Ø9.5 | 33 to 42N•m (3.3 to 4.2kgf•m) |
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size | Ø12.7 | 33 to 42N•m (3.3 to 4.2kgf•m) |
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| Ø15.9 | 20 to 25N•m (2.0 to 2.5kgf•m) |
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Charge port | 14 to 18N•m (1.4 to 1.8kgf•m) | |
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Additional refrigerant
1.The amount of refrigerant put into the outdoor unit at the factory is sufficient to fill up to 20m of refrigerant piping work.
2.If the length of the refrigerant piping work is 20m or less, addition of refrigerant at the installation site is unnecessary.
3.If the length of the piping work exceeds 20m, extra refrigerant must be added. Refer to the outdoor installation manual for details of the extra amounts.
4.Overcharge or undercharge of refrigerant in the outdoor unit may cause malfunction of the compressor.
Add Only R410A Refrigerant to These Units
Heat insulation
1.Provide heat insulation on the refrigerant piping on both the liquid side and gas side separately, and ensure that all joints in the insulation are compleatly sealed (without gap).
2.Since the temperature of the piping on the gas side increases during heating operations, the heat insulating material used must be able to withstand temperatures of more than 120°C.
3.Use the pipe insulation supplied in the accessory pack to insulate the piping connecting section on the indoor unit side.
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