1. The Step by Step Charging Techniques
Proper Charging Techniques are Vital to the Proper Operation, Safe, and Trouble Free System

2. Always Remember, Safety is #1 and Everyone’s Business!

3. Use Safety Equipment

4. Remove Jewelry

5. Lift and Move Correctly

6. High voltage is always dangerous.
Electric Shock
BE CAREFUL!
High voltage is always dangerous.
Even 40 volts can be lethal if skin is wet or damaged.

7. Upside Down or Right Side Up?

8. Recovery Cylinders

9. Charging by the Weigh In Method

10. Charging by the Weigh In Method

11. Subcooling Method For TXV’s

12. How To Find Subcooling?

13. System Setup

14. Example For Subcooling

15. Subcooling Method Continued

16. When To Add or When To Remove?

17. Step by Step Procedure for Proper Subcooling Method
Connect refrigerant manifold set to HVAC equipment.
Attach & insulate an electronic thermometer to the liquid line near the service access port. Run the equipment for 30 minutes to allow the system pressures and temperatures to stabilize.
Measure and record the liquid line temperature.
Monitor and record the liquid line pressure using the gauge manifold set.
Review the subcooling temperature located on the equipments nameplate.

18. Step by Step Procedure for Proper Subcooling Method
6. Convert the liquid line pressure gauge reading to the correct saturated condensing temperature (review with PT chart).
7. Record the saturated temperature and liquid line temperature.
8. Then subtract your liquid line temperature from your saturation temperature to calculate subcooling.
SATURATION TEMPERATURE
LIQUID LINE TEMPERATURE
SUBCOOLING

19. Where Do I Connect Up To For Suction Gas Superheat?

20. How Close Is Close on Charging?

21. How To Figure Suction Gas Superheat
*Note: Stabilize and run the system for at least 15 minutes

22. Here’s An Example

23. Our Example Continued

24. When To Add Or When To Remove?

25. Step by Step Procedure for Proper Superheat Method
Connect refrigerant manifold set to HVAC equipment.
Attach & insulate an electronic thermometer to the suction line near the service access port. Run the equipment for 30 minutes to allow the system pressures and temperatures to stabilize.
Measure and record the suction line temperature.
Monitor and record the suction line pressure using the gauge manifold set.

26. Step by Step Procedure for Proper Subcooling Method
5. Convert the suction line pressure gauge reading to the correct saturated suction temperature (review with PT chart).
7. Record the saturated temperature and suction line temperature.
8. Then subtract your liquid line temperature from your saturation temperature to calculate superheat.
SATURATION TEMPERATURE
SUCTION LINE TEMPERATURE
SUPERHEAT

27. Can Discharge Gas Superheat Be Used For A Charging Method?
NO, However…..

28. Discharge Gas Superheat Can Be Used As A Check Method
Use It As A Tool
Discharge Gas Superheat Can Be Used As A Check Method

29. Here’s How To Do It
Place your temperature probe onto the discharge line of the compressor
Take a discharge pressure reading
Convert your discharge pressure reading to temperature with your PT chart
Subtract the two and be within a range of 50 degrees to 90 degrees

30. What Is Superheat?
It’s the temperature above the saturation temperature of the vapor in the system.

31. What Is Subcooling?
It’s the temperature below the saturation temperature of the liquid in the system.

32. A Good Rule of Thumb
The amount of refrigerant quantity is related to subcooling.
The performance of the system is related to suction gas superheat.
Check both; subcooling & suction gas superheat.

33. It’s Time for Questions & Answers

34. Pass Up Your Business Cards

35. Thank You For Your Business for 2007!!