Gree Ultra Heat GMV-V72W/A-F, Service Manual

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Ultra Heat GMV VRF Technical Service Manual MAINTENANCE
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25°C(77°F) and pressure decreases to 2.43MPa(352PSIG) accordingly. The system is regarded
qualified despite the pressure decrease.
Step 12: 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.
Fill amount is determined by two factors: the number of compressors replaced and the draw
amount from each part. For replacement of one compressor, 1.35 L lubricant should be added. The fill
amount should be equal to or a little larger than the draw amount.
Examples:
One compressor is replaced; lubricant that is drawn from the gas separator is 1L and lubricant that
is drawn from the oil separator is 0.7L.Then, the total required amount is 1.35L+1L+0.7L=3.05L. You
should add 3.05L lubricant into the system.
Specific procedure is as follows:
(1) Ultra Heat GMV series units use FV50S 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 low-pressure measurement 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 low-pressure measurement valve. The lubricant will be
pressed into the low pressure side of units.
(5) If the lubricant is added portion by portion, close the low-pressure measurement 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.
Note: Lubricant is of great importance to the normal running of compressors. You should follow
Gree’s requirement to add qualified lubricant of the specified trademark and ensure properness of fill
amount.
Gas pipe
Liquid pipe
Low pressure
check valve
Extract air through all
valves. In the course of oil
filling, keep on extracting
action.