Gree D Series - Page 51

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D Series Modular Air-cooled Scroll Chillers
Service Manual
Step 3: Open the valves at both the high-pressure and low-pressure sides and then start the vacuum pump
until the gage reading is below -1bar. After that, let the vacuum pump lasts for another 0.5~1.0 hour.
Step 4: Close the valves and stop the vacuum pump. Note that only the valves have been closed can the
vacuum pump be stopped, otherwise air is possible to go into the system again.
Step 5: Take the leakage test. Be sure the vacuumed system keeps a pressure no higher than 80Pa and
keeps little pressure rise in half an hour.
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Adding
Hi-pressure gage
Low-pressure gage
Pipeline
Pipeline
Manifold gage
Refrigerant charge
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Step 1: Weigh the refrigerant tank with an electronic scale and connect the refrigerant tank with the
pressure gage through the pipeline.
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and then tighten the connector.
Step 3: Return the electric scale to zero by energizing it again.
Step 4: Open all valves between the refrigerant tank and the unit to charge refrigerant as per the amount
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the refrigeration capability and result in poor lubrication and high discharge temperature etc. Note that only
refrigerant vapor can be charged into the system at the low-pressure side when the unit is in operation.
However, it is highly recommended to charge refrigerant at the hi-pressure side when the unit is shut down,
otherwise it would cause slugging during startup.
(2). Air Purge
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vacuumed.
a. Connect the manifold gage.
b. Vacuum the system with a vacuum pump.
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d. The refrigerant charge will be affected by the ambient temperature. When the charge is under the
required amount, it is allowed to add refrigerant vapor after starting the water pump and the unit.
ТОО "Everest climate" г. Алматы, Варламова 1а, тел.+7 727 230 00 10, e-mail: info@aircon.kz, сайт:www.aircon.kz