GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
225
system pressure up to4.0Mpa(580psi
）
for more than 12 hours. If the pressure remains unchanged, you
can extract all air. Otherwise, you should find the leakage points first.
While determining system pressure change, take temperature into consideration. For every 1°C (1.8
℉
) temperature change, pressure will change by 0.01 MPa (1.45psi) accordingly. Suppose that nitrogen
pressure reaches 2.5 MPa (362.5psi
）
at 30°C(86
℉
), 12 hours later, temperature decreases to 25°C (77
℉
) and pressure decreases to 2.43 MPa (352.4psi
）
accordingly. The system is regarded qualified
despite the pressure decrease.
Step 13: Fill lubricant.
Quantity of lubricant that is needed is subject to the total draw amount from compressors and parts.
The fill amount should be equivalent to the draw amount. If the draw amount is too little or too much,
clear all lubricant first and determine fill amount by referring to Appendix 1 (accessory list).
Fill amount is determined by two factors: the number of compressors replaced and the draw amount
from each part. For replacement of one compressor, 1.5 L lubricant should be added. The fill amount
should be equal to or a little larger than the draw amount.
Specific procedure is as follows:
1) GMV5 series units use FVC68D or FV-68H lubricant. Make sure to confirm the trademark of the
lubricant first. Lubricant of other trademarks is not allowed.
2) Open all valves and extract air for 30 minutes or longer.
3) Connect a rubber hose to the oil checking valve at one end. Open the container that holds
lubricant and pour lubricant into a measuring glass. If the glass is too small to hold the lubricant of a
required amount, measure the lubricant portion by portion. Record volume of each portion and then put
the other end of the rubber hose into the glass.
4) Keep on extracting air and open the oil checking valve. The lubricant will be pressed into the low
pressure side of units.
5) If the lubricant is added portion by portion, close the oil checking valve first and then measure
another portion of lubricant. In the course of repeated measuring and adding, keep the extraction action.
6) After a required amount of lubricant is added, close the oil checking valve to ensure tightness.
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