Before charging the refrigerant, please evacuate the refrigeration system firstly. Evacuation is an essential and important process before refrigerant charging in production, installation and maintenance. Because the air contains a large amount of nitrogen, oxygen and water and so on. These gases will cause harm to the operation of our refrigeration system.
Please click here for more details:
How to properly evacuate a refrigeration system? What is evacuation process?
How to Charge Gas in Refrigeration System?
R404a Refrigerant Charging Procedure:
- After evacuating the condensing unit refrigeration system, put the refrigerant bottle upside down on the electronic scale.
- At same time, open the high and low pressure valves of the pressure gauge to charge the refrigerant.
- The amount of the refrigerant charge can be refer to “ Recommendation of System Refrigerant Charging Amount”
- After Charging the Refrigerant, waiting for 15 minutes for pressure balance.
What is Important to Charge R404A Refrigerant Properly?
- Charge the LIQUID REFRIGERANT from high pressure side after evacuation. It is forbidden to charge the liquid refrigerant from low pressure side.
- If short of refrigerant, charge the gaseous refrigerant from low pressure side when the system is running. If the system is short of refrigerant, the temperature switch or the compressor motor thermostat will auto reset.
- The refrigerant system must run over 1 minute after charging refrigerant 15 minutes.
- Fill the refrigerant until no air bubbles in the sight-glass; and it should be not exceed the maximum amount. When the refrigerant charge volume is large, an receiver is required.
- The evaporator must be in the range of MAX. Refrigerant. If R404A refrigerant charge not enough, the liquid injection will be not enough. If overcharge, the oil will be diluted, causing damage to the sliding surface and liquid compression. For proper charging, must use a sight-glass to confirm.
Recommendation of System Refrigerant Charging Amount
System refrigerant charging amount=HP of condensing unit X 1.1~1.3
For example, 3 HP condensing unit refrigerant charging amount:
3 HP X 1.1~1.3=3.3~3.9KG
The actual refrigerant charge amount can be adjusted according to installation.
If you have any questions about the commercial refrigeration system charge, feel free to contact with us.
Commercial Refrigeration Condensing Unit Manufacturer
Glen Refrigeration is a leading manufacturer and supplier of commercial refrigeration condenser units in China. We are the only one manufacture of horizontal indoor condenser unit with Sanyo refrigerator compressor in China. From small condensing unit, indoor condensing unit and outdoor condensing unit, either air cooled or water cooled, we offer sustainable refrigeration condensing unit and systems which are eco-friendly, and energy saving.
Do You Have A Refrigeration Project We Can Help With?
Contact us by email info@greehvacr.com or Whatsapp 0086 15057108995 or fill out the contact form below. Let’s discuss how Glen Refrigeration can help you with complete commercial refrigeration system solutions!
We look forward to your inquiry!
