Charging Refrigerant

Charging Cylinder:

SETTING OF CHARGING CYLINDER
1. Make sure that inlet and outlet valves of charging cylinder are closed.
2. Slowly open liquid line valve of refrigerant tank.
3. Slowly open inlet valve of charging cylinder.

The refrigerant will flow into the sight glass of charging cylinder as inlet valve is opened.

Charging Cylinder:

4. Slowly open upper vent valve to release pressure from charging cylinder. While doing so, continue charging until required amount of refrigerant is reached.

The refrigerant volume changes with temperature and pressure. It is necessary to charge refrigerant with a little more than required amount (indicated on sight glass).

5. Close inlet valve and upper vent valve of charging cylinder.

Pressure Gauge:

6. Turn on heater switch (charging cylinder is provided with a heater.)

The refrigerant charging time can be reduced by heating refrigerant to increase its pressure. In this case, do not allow the pressure in cylinder to rise higher than 1,030 kPa (10.5 kglcm2, 150 psi). (if pressure rises above this level, turn oft the heater.) The pressure in the charging cylinder can be measured by upper pressure gauge.

Flow Meter:

SETTING OF FLOW METER
1. Rotate charging cylinder main body until scale for R12 is at the correct position on sight glass.
2. Read charging cylinder pressure gauge.
3. Rotate charging cylinder so that scale of charging cylinder agrees with pressure value indicated on pressure gauge.

Refrigerant Tank:

CALCULATING CHARGING AMOUNT OF REFRIGERANT
1. Record the amount of refrigerant in the sight glass before charging.
2. Subtract the required amount of refrigerant (charge quantity specified for the vehicle) from the amount of refrigerant recorded in step 1. Charge refrigerant into the system until the remaining value equals to the value indicated on the sight glass.

Example:
Level in sight glass: 3 lb 8 oz
Charge specification: 2.0 - 2.4 lb.

Calculate charge quantity into lb and oz as follows: 1 lb = 16 oz, and 0.1 lb = 1.6 oz, so that 2.0 lb = 32 oz, 2.4 lb = 32 + (4 x 1.6) = 32 + 6.4 = 38.4, round off to 38.
Therefore our charge quantity will be between 32 and 38 oz, or 2 lb 0 oz to 2 lb 6 oz. Subtract 2 lb 6 oz from level in sight glass (3 lb 8 oz) = 1 lb 2 oz.

This will be our ending point.