Industrial cold water machine add refrigerant system requirements

industrial chillers system after vacuum test qualified, can use in the system of vacuum refrigerant filling work.

a, refrigerant charging

the new installed system, refrigerant can be added by the high pressure side, the operation method is as follows:

1) Open the condenser cooling water system, the valve when the vacuum test condition in the system.

2) With west 14 mm x 2 mm seamless steel tube ( When the filling freon with copper tube) Will be connected with refrigerant cylinders. Bottle mouth downward sloping, the cylinder into 30 ° Angle with the ground, or will the cylinder tail pad high of about 200 ~ 300 mm.

3) Open valve filling agent. When the system reaches a certain pressure ( Ammonia is 0. 1 to 0. 2MPa; Freon system is zero. 2 to 0. 3MPa) , suspending refrigerants, filling in each joint and the welding place again check the sealing of a system, such as no leakage, can continue to charge people refrigerants.

4) Close the receiver on the valve of produced liquid, to continue filling the refrigerants, when the cylinder pressure and pressure balance in the receiver, the you should open the liquid valve on the receiver.

5) Starting refrigerator, the refrigeration unit into operation, while continuing to charge refrigerants. When there is frost cylinder bottom, said liquid refrigerant is close to filling the bottle, then can close steel cylinder valves and valve filling agent, continue filling in the bottle.

6) Unless the outside temperature is very low, generally do not need to adopt when filling the refrigerant pressure pouring hot water on a cylinder in order to improve the cylinder, because it not safe to do so. If you want to speed up the filling speed, hot water temperature shall not exceed 50 ℃ and yan, disable other methods on the cylinder heating.

7) Freon filling must be set on special over dry filters, to reduce the possibility of moisture into the system. Using high pressure period of filling, must not starting the compressor, and pay attention to the exhaust valve can not leak, otherwise it will produce liquid impact.

8) Filling refrigerant charge dose of 90%, can temporarily stop filling work, carries on the system of the test run, to see if system dose has meet the requirements of operation, to avoid excessive filling agent and cause unnecessary trouble. For old refrigeration system, to add refrigerant, should by filling the low pressure side.

2, after filling the leak detection of

( 1) Test leak detection method with phenolphthalein commonly test on the system of joint, flange, threaded the place such as interface for leak detection. Will close to the client after test paper wet place, such as red indicates that the ammonia leakage ( Pay attention to avoid paper with soap and water on the pipeline contact illusion) 。 Can also be used in ammonia blue litmus paper.

( 2) Halogen lamp, halogen leak detection method burner is the common use of the freon refrigeration system leak detection tool, homebred halogen lamp as shown in the figure below, using method is as follows:

1, add alcohol: 1 unscrew first base, add to the inside barrel purity is not less than 99. 5% of anhydrous alcohol, but the injection volume shoulds not be too much, just full of lamp tube volume can be 1/2 to 3/4, then should tighten speed will base.

2, the fire: the hand wheel to the right, 2 shutoff valve core, then the glass filled cup, then lit, make the lamp tube and the upper burner heating, heating a little, check whether torch gas leakage.

3, ignition: stay inside the beaker alcohol close to burn down the handwheel 2 left turn a circle, in the circle of flame lit within 4 nozzles of alcohol volatile, at this time of halogen lamp suction hose is indeed a gas suction sounds, you can start using light leak detection.

4, use: test the suction hose nozzle close to 6 tested is investigated, and slowly move, freon gas leakage, if any, in the flame namely decomposition, the red orange glow of the fire will turn into a green, flame color changes with freon leakage quantity is different, the deeper the color shows that the more serious the freon leak.

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