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Инструкция по эксплуатации Страница: 192

Gree HOME GMV Инструкция по эксплуатации онлайн [192/367] 48267

Dc Inverter VRF plus Water Heater Solution Service Manual INSTALLATION

188

Operating Steps:

◆ Pressurization

Use nitrogen to add pressure from Freon nozzle of the gas and liquid pipe on outdoor unit side:

Step 1: Increase the pressure to 0.3MPa and wait for 3 minutes or longer

Step 2: Increase the pressure to 1.5MPa and wait for 3 minutes or longer

The step 1 and 2 are focused on checking the significant leakage point. If any, reweld immediately

or repair the leakage point.

Step 3: Increase the pressure to 2.5MPa and keep it for approx. 24 hours to check the small

leakage.

Though the pressure is increased to 2.5MPa, it cannot be guaranteed to find out the small leakage

if the waiting time is too short. Therefore, the pressure in Step 3 must be kept for 24 hours.

Note: During pressure maintaining after nitrogen is filled, the pressure gauge shall not be

dismantled, because activities of dismantling or mounting pressure gauge would affect pressure

change.

◆Check pressure drop

Criteria for Inspection eligibility:

※ Except for temperature influences (pressure changes about 0.01MPa for temperature change

of 1 ), if pressure drop is not more than 0.02MPa within 24h, the system will be eligible. For ℃

example, nitrogen is filled to reach 2.5MPa at 30 ; after 24 hours, when temperature becomes ℃

25 , the system will be eligible if pressure is over 2.43 MPa and ineligible below 2.43 MPa.℃

※ If ineligible, leak sources must be located. After leak sources are found, re-welding or repair

welding is necessary. Then, the above procedures shall be repeated. Nitrogen is filled,

pressurized and maintained until pressure drop remains within required range.

◆Leak check

[Check 1] When pressure drop is found, leak hunting shall be performed in the ways as follows:

a. By ears…….to listen voices related to leakage

b. By hands……to sense whether leakage is existent at connecting parts

[Check 2] If no leakage is found using the above methods, nitrogen shall be discharged and

refrigerant shall be filled in to reach 0.5MPa.

a. By soap and water……soap bubbles will show leakage positions if any.

b. Detector (such as halide detector) can be used for leak hunting

Using the above methods, check all possible leak sources.

If leakage still fails to be located, sectional check shall be taken for refrigerant piping that would be

divided into multiple check portions for locating leak source in a certain section.

2） Pressure maintaining and leak hunting of the system（with refrigerant piping in

connection with indoor unit and outdoor unit）

When refrigerant piping is to be installed, pressure maintaining and leak hunting is required for the

piping. After refrigerant piping is in connection with indoor unit and outdoor unit, pressure

maintaining and leak hunting is also required. The purpose of the test is to check whether any leak

is existent at threaded connection of indoor unit and outdoor unit and at new welded points.

Steps:

◆Nitrogen is charged to reach 2.5MPa and remains at the pressure for 24h (nitrogen shall be

filled from refrigerant filling nozzles at the big valve as well as the small valve using a pressure

gauge; during pressure maintaining after nitrogen is charged, the pressure gauge shall not be

dismantled.)

◆Observe whether pressure changes in 24 hours. (for eligibility criteria, see pressure maintaining

and leak hunting of refrigerant piping in 5.5.2)

◆If any leakage, please check threaded connections and new welded spots of indoor unit and

outdoor unit. Repair welding shall be performed immediately. Afterwards, pressure maintaining is

repeated until eligibility is reached.

10.10 Heat Preservation of Refrigerant Piping

Gree HOME GMV Инструкция по эксплуатации онлайн [192/367] 48267

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