DISCHARGING, EVACUATING, CHARGING AND CHECKING — Charging Refrigerant (Cont'd) / Setting of Flow Meter
HA-19prose procedureCharging Refrigerant (Cont'd)
Setting of charging cylinder (continued)
- 4Slowly 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).
RHA678B - 5Close inlet valve and upper vent valve of charging cylinder.
- 6Turn 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 (10.30 bar, 10.5 kg/cm², 150 psi). (If pressure rises above this level, turn off the heater.) The pressure in the charging cylinder can be measured by upper pressure gauge.
RHA679B
Setting of flow meter
- 1Rotate charging cylinder main body until scale for R12 is at the correct position on sight glass.
RHA580B - 2Read charging cylinder pressure gauge.
- 3Rotate charging cylinder so that scale of charging cylinder agrees with pressure value indicated on pressure gauge.