JIIIL Refrigerant Charge Calculator
This article explains how to use the JIIIL refrigerant charge calculation shown in the service calculator.
- Total refrigerant charge = Factory Charge (A) + Additional Pipe Charge (B)
- 1/4 in. pipe additional charge: 0.021 kg per metre
- 3/8 in. pipe additional charge: 0.058 kg per metre
- 1/2 in. pipe additional charge: 0.114 kg per metre
- Example model shown: AJY072LELALH
- Factory charge shown for AJY072LELALH: 7.0 kg
- Maximum system charge shown: 20 kg
Calculation Method
| Section | Description |
|---|---|
| A | Factory refrigerant charge for the selected outdoor unit model |
| B | Additional refrigerant required for the entered pipe lengths |
Total Refrigerant Charge (kg) = A + B
Step 1 - Select the Outdoor Unit
Select the applicable outdoor unit model in the calculator.
The calculator then provides the corresponding Factory Charge. This becomes Section A of the calculation.
Model: AJY072LELALH
Factory charge: 7.0 kg
Step 2 - Enter Additional Pipe Length
Enter the applicable pipe length in metres for each pipe size used in the system.
| Pipe Size | Additional Charge Rate | Calculation |
|---|---|---|
| 1/4 in. | 0.021 kg/m | Pipe length (m) x 0.021 |
| 3/8 in. | 0.058 kg/m | Pipe length (m) x 0.058 |
| 1/2 in. | 0.114 kg/m | Pipe length (m) x 0.114 |
Add the calculated refrigerant quantity for all three pipe sizes. This becomes Section B.
Step 3 - Calculate Total Refrigerant Charge
Add the factory charge and the additional pipe charge:
Worked Example
The following example demonstrates the calculation method only.
- Factory charge (A): 7.00 kg
- 1/4 in. pipe length: 20 m
- 3/8 in. pipe length: 25 m
- 1/2 in. pipe length: 10 m
1/4 in. pipe charge:
20 m x 0.021 kg/m = 0.42 kg
3/8 in. pipe charge:
25 m x 0.058 kg/m = 1.45 kg
1/2 in. pipe charge:
10 m x 0.114 kg/m = 1.14 kg
Total additional pipe charge (B):
0.42 kg + 1.45 kg + 1.14 kg = 3.01 kg
Total system refrigerant charge:
7.00 kg + 3.01 kg = 10.01 kg
Maximum System Charge
Always compare the final calculated refrigerant quantity with the maximum system charge shown by the calculator for the selected system.
Technician Checklist
- Select the correct outdoor unit model.
- Confirm the factory charge displayed by the calculator.
- Measure the applicable 1/4 in., 3/8 in. and 1/2 in. pipe lengths.
- Calculate the additional charge using the correct kg/m rate for each pipe size.
- Add all additional pipe charges together.
- Add the additional charge to the factory charge.
- Confirm the final system charge does not exceed the maximum shown in the calculator.
- Record the final refrigerant charge on the commissioning documentation.