TROUBLE DIAGNOSIS
Items | Precautions |
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4.Vacuum degassing. | Evaporator |
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| Suction pipe |
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| Compressor |
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| Drier |
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| Condenser |
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| 3 |
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| 2 | 1 | |
| Low |
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| pressure | High | |
| Blue | pressure | |
| Yellow |
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| Red | |
| Vaccum | KEYPOINTING | |
| Pump | ||
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| - If power is applied | |
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| during vacuum | |
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| degassing, vacuum | |
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| degassing shall be | |
Pipe Connection | more effective. | ||
- Operate compressor | |||
Connect a red hose to the high pressure side and a blue hose to the | |||
while charging | |||
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low pressure side. | refrigerant. (It is | ||
Vacuum Sequence | easier and more | ||
certain to do like | |||
Open , | valves and evacuate for 40 minutes. Close valve . | ||
this.) | |||
5.Refrigerant charging.
Charging sequence
1)Check the amount of refrigerant supplied to each model after completing vacuum degassing.
2)Evacuate bombe with a vacuum pump.
3)Measure the amount of refrigerant charged.
-Measure the weight of an evacuated bombe with an electronic scale.
-Charge refrigerant into a bombe and measure the weight. Calculate the weight of refrigerant charged into the bombe by subtracting the weight of an evacuated bombe.
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| Indicate the weight of | KEYPOINTING | ||
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| an evacuated bombe | - Be sure to charge | ||
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| the refrigerant at |
R134a |
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| around 25°C. | ||||||
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- Be sure to keep
Calculation of amount of refrigerant charged
the amount of refrigerant charged= a weight after charging - a weight before charging (a weight of an evacuated cylinder)
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