1.MAINTENANCE DATA
1.1 Servicing
(1)Evacuation
The evacuation is a procedure to purge impurities, such as noncondensable gas, air, moisture from the refrigerant equipment by using a vacuum pump. Since the refrigerant R410A is very insoluble in water, even a small amount of moisture left in the refriger- ant equipment will freeze, causing what is called ice clogging.
Evacuation procedure |
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Make sure that the both service valves of gas and liquid line are fully opened. | Indoor unit |
(a) Check to ensure that there is no internal pres- |
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sure in the unit. If there is an internal pres- |
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sure, it should be relived through the service |
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port. |
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| Gus line |
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(b) Connect the charging hose of the gauge mani- |
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fold to the service port of the gas piping. |
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| Liquid line |
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Close high pressure valve 2 of gange mani- |
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fold. |
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| Gauge manifold |
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(c) Connect the charging hose A to a vacuum |
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pump. |
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| 1 | 2 | Handle Hi | |
Repeat evacuation in the following sequence. |
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| Charge hose A | |||
| Vacuumingcompleted |
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| Vacuum gauge check | Handle Lo |
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Please run the | No increase in the | Charge hose |
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vacuum pump for at | reading of the | (for R410A only) |
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least one hour after | vacuum gauge's |
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Charge valve | Vacuum | Refrigerant | |||||
the vacuum gauge | needle pointer. | cylinder | |||||
Vacuum adapter | |||||||
pump | |||||||
shows |
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beginsVacuuming |
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lower. |
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lower) |
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| Notes (1) Refer to the | |||
When the vacuum gauge's needle pointer creeps up, there is moisture left in the system or a leak. Pull air again after you have checked the system for a leak and rectified it. Use a reverse flow stop adapter to prevent the vacuum pump's lubricant oil from flowing into the refrigerant system.
Notes (1) Do not use the refrigerant pressure to expel air.
(2)Do not use the compressor for evacuation.
(3)Do not operate the compressor in a vacuum condition.
(2)When connecting of ther service valve, flare connection for both the indoor and outdoor unit.
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