Operation Procedure For Refrigerant Charging
Operation Procedure for Refrigerant ChargingStep 1 - 2:
WARNING:
- Your eyes should not be exposed to refrigerant (liquid). Any liquid HFC-134a (R-134a) escaping by accident shows a temperature as low as approximately -6 �C (21.2 �F) below freezing point. Should liquid HFC-134a (R-134a) get into your eyes, it may cause a serious injury. To protect your eyes against such accident, it is necessary to always wear goggles. Should it occur that HFC-134a (R-134a) strikes your eyes, consult a doctor immediately.
- Do not use your hand to rub the affected eye(s). Instead, use quantities of fresh cold water to splash it over the affected area to gradually raise temperature of such area above freezing point.
- Obtain proper treatment as soon as possible from a doctor or eye specialist.
- Should the HFC-134a (R-134a) liquid come into contact with your skin, the affected area should be treated in the same manner as when skin is frostbitten or frozen.
- Refrigerant must not be handled near where welding or steam cleaning is performed.
- Refrigerant should be kept at a cold and dark place. It should never be stored where a high temperature is anticipated, e.g. where exposed to direct sun light, close to fire or inside vehicle (including trunk room).
- Avoid breathing fumes produced when HFC-134a (R-134a) is burned. Such fumes may be hazardous to health.
Recovery
When evacuating A/C system, always recover refrigerant by using equipment for refrigerant recovery and recycling equipment. Discharging refrigerant HFC-134a (R-134a) into atmosphere would cause adverse effect to environments.
NOTE:
- After recovering refrigerant from system, the amount of removed compressor oil must be measured for replenishing compressor oil.
- When handling recovery and recycling equipment, be sure to follow the instruction manual for the equipment.
Replenishing Compressor Oil
It is necessary to replenish specified amount of compressor oil to compressor (1) from compressor suction side hole (2) before evacuating and charging refrigerant.
When charging refrigerant only
When charging refrigerant without replacing any component part, replenish the same amount of measured oil when recover refrigerant (if not measure, replenish 30 cu.cm (30 cc) oil).
When replacing compressor
Compressor oil is sealed in each new compressor by the amount required for A/C system. Therefore, when using a new compressor for replacement, drain excess oil from it by the amount calculated as follows.
"C"="A"-"B"
"C": Amount of oil to be drained
"A": Amount of oil sealed in a new compressor
"B": Amount of oil remaining in removed compressor
NOTE: Compressor assembly supplied from factory is filled up with the following amount of oil.
Oil amount in compressor
100 cu.cm (100 cc)
When replacing other part
Replenish the following amount of oil to compressor.
Amount of compressor oil to be replenished
Replaced part: Amount of compressor oil
Evaporator: 25 cu.cm (25 cc)
Condenser: 15 cu.cm (15 cc)
Desiccant: 20 cu.cm (20 cc)
Hoses: 10 cu.cm (10 cc) each
Pipes: 10 cu.cm (10 cc) each
Evacuating of A/C System
CAUTION: Do not evacuate before recovering refrigerant in system.
NOTE: Whenever opened (exposed to atmospheric air), the A/C system must be evacuated by using a vacuum pump. The A/C system should be attached with a manifold gauge set, and then should be evacuated for approximately 15 minutes.
1. Connect high charging hose (1) and low charging hose (2) of manifold gauge set (3) respectively as follows:
- High charging hose (1) -> High pressure charging valve (4) on condenser outlet pipe
- Low charging hose (2) -> Low pressure charging valve (5) on suction pipe
2. Attach center charging hose (6) of manifold gauge set (3) to vacuum pump (7).
3. Operate vacuum pump (7), and then open discharge side valve (Hi) (8) of manifold gauge set (3).
If there is no blockage in the system, there will be an indication on high pressure gauge (9).
In this case, open the other side valve (Lo) (10) of the set and repair the system.
4. Approximately 10 minutes later, low pressure gauge (11) should indicate -100 kPa (-1.0 kg/sq.cm, -760 mmHg, -14.7 psi) providing no leakage exists.
NOTE:
- If the system does not indicate -100 kPa (-1.0 kg/sq.cm, -760 mmHg, -14.7 psi), close both valves, stop vacuum pump and watch movement of low pressure gauge.
- Increase in the gauge reading suggests existence of leakage. In this case, repair the system before continuing its evacuation.
- If the gauge shows a stable reading (suggesting no leakage), continue evacuation.
5. Evacuation should be carried out for at least 15 minutes.
6. Continue evacuation until low pressure gauge (11) indicates -100 kPa (-1.0 kg/sq.cm, 760 mmHg, 14.7 psi), and then close both valves (8), (10).
7. Stop vacuum pump (7), and then disconnect center charging hose (6) from pump inlet. Now, the system is ready for charging refrigerant.