| Before you have opened the system | | | | or locking nut screw tap assembly into adapter so |
| Beware | | | | sealing gasket is fully seated against the can top. |
| When discharging air conditioning system, use only | | | | Turn tap inward to pierce the can and close the |
| approved refrigerant recovery recycling | | | | tap. DO NOT open tap until ready to purge the |
| equipment make sure you make every attempt | | | | service hose or dispense refrigerant into the |
| to avoid discharging refrigerant into the | | | | system. |
| atmosphere. | | | | Be certain tap handle is turned fully inward to the |
| DISCHARGING THE A/C SYSTEM | | | | closed position. Check that locking base is turned |
| The EPA indicates that R-11, R-12 and R-113 are | | | | to its outer limit. Securely engage locking lugs |
| very harmful to the Earths Ozone layer. Make | | | | over the can flange. Turn entire tap assembly |
| sure you make every attempt possible to avoid | | | | downward into the locking base to pierce the can. |
| discharging R-11, R-12 or R-113 into the | | | | DO NOT open tap until ready to dispense into |
| atmosphere. | | | | system. |
| 1. Remove service valve and install gauges. For | | | | DO NOT open high side hand valve while air |
| high side gauge hose, Adapter must be used to | | | | conditioning system is in operation. This high |
| connect to high side service valve. | | | | pressure could rupture can or fitting at safety can |
| 2. Slightly open low side gauge valve and let | | | | valve, resulting in damage and personal injury. |
| refrigerant escape slowly without loosing | | | | CONNECTING LINES & FITTINGS |
| refrigerant oil. | | | | A new "O" ring should be used in all instances |
| 3. When system is nearly discharged, using | | | | when connecting lines and fittings. Always use two |
| approved refrigerant recovery recycling | | | | wrenches to avoid twisting or distorting lines and |
| equipment, open high side gauge valve to release | | | | fittings, tighten coupling nuts securely. |
| any pressure trapped in compressor. Close valves | | | | PLACING SYSTEM IN OPERATION |
| immediately after discharging to prevent entry of | | | | 1. Evacuate the system using a vacuum pump. |
| moisture. | | | | 2. Charge the system with new R-12 according to |
| DISCONNECTING LINES & FITTINGS | | | | each individual vehicle to Refrigerant Capacity. |
| 1. After system is discharged, using approved | | | | 3. Leak test the system, with particular attention |
| refrigerant recovery recycling equipment, carefully | | | | to all new connections and components. |
| clean entire area around coupling nut to prevent | | | | 4. Make a performance test of the system. |
| dirt entering system. Always use two wrenches | | | | COMPRESSOR REMOVAL INFORMATION |
| to avoid twisting or distorting lines and fittings | | | | On systems which have compressors equipped |
| 2. Cap or plug all LINES and FITTINGS | | | | with stem-type service valves, it is possible to |
| immediately to prevent entry of air and moisture | | | | isolate the compressor for removal. |
| into system. Do not remove these caps until | | | | Turn both high and low pressure manual valves to |
| connections are being made make sure you make | | | | extreme clockwise position. Loosen cap on high |
| every attempt to avoid discharging refrigerant | | | | pressure manual valve connection to compressor |
| into the atmosphere. | | | | and allow gas to escape until compressor is |
| COMPONENT REPLACEMENT | | | | relieved of pressure. |
| When components are replaced, system oil level | | | | COMPRESSOR REMOVAL INFORMATION - |
| must be adjusted. Add refrigeration oil to | | | | DISCHARGE METHOD |
| replacement component. See Compressor oil | | | | This procedure is to be used on vehicles which |
| Check article, as well as, Component Oil | | | | have compressor equipped with Schrader valves. |
| Replacement Quantities" chart under "A/C | | | | In these cases, the compressor cannot be |
| SYSTEM SPECS" article in this HEATER AND AIR | | | | isolated and the system must be discharged, using |
| CONDITIONING | | | | approved refrigerant recycling equipment. |
| SYSTEM PRECAUTIONS | | | | USING R-12 REFRIGERANT. |
| Before you have opened the system | | | | 1. Always wear eye protection when around air |
| BE AWARE | | | | conditioning systems and R-12. The system's high |
| When discharging air conditioning system, use only | | | | pressure can cause severe injury to eyes and |
| approved refrigerant recovery recycling | | | | skin if a hose were to burst. R-12 evaporates |
| equipment make sure you make every attempt | | | | quickly when exposed to atmosphere, freezing |
| to avoid discharging refrigerant into the | | | | anything it contacts. |
| atmosphere. | | | | 2. Use care when handling refrigerant containers. |
| DISCHARGING THE A/C SYSTEM | | | | DO NOT drop or strike containers or expose |
| The EPA indicates that R-11, R-12 and R-113 are | | | | refrigerant containers to excessive heat. |
| very harmful to the Earths Ozone layer. Make | | | | Containers must never be heated more than |
| sure you make every attempt possible to avoid | | | | (52°C) 125°F. Never expose R-12 |
| discharging R-11, R-12 or R-113 into the | | | | directly to open flame. |
| atmosphere. | | | | CAUTION: When R-12 is exposed to an open |
| 1. Remove service valve and install gauges. For | | | | flame, drawn into a running engine, or detected |
| high side gauge hose, Adapter must be used to | | | | with a Halide leak tester, poisonous phosgene gas |
| connect to high side service valve. | | | | is formed. Keep work areas ventilated. |
| 2. Slightly open low side gauge valve and let | | | | INDIVIDUAL R-12 CANS |
| refrigerant escape slowly without losing refrigerant | | | | Disposable refrigerant cans have a flat type seal |
| oil. | | | | or a screw type seal, and proper can tap must |
| 3. When system is nearly discharged, using | | | | be used for each type. Be sure sealing gasket on |
| approved refrigerant recovery recycling | | | | can tap is in good condition. A proper safety can |
| equipment, open high side gauge valve to release | | | | tap will prevent refrigerant from flowing back into |
| any pressure trapped in compressor. Close valves | | | | open can, as tap has a one-way flow control. |
| immediately after discharging to prevent entry of | | | | MULTI-CAN DISPENSING VALVES |
| moisture. | | | | A multi-can dispensing valve allows attachment of |
| DISCONNECTING LINES & FITTINGS | | | | several cans of refrigerant, and is a good |
| 1. After system is discharged, using approved | | | | substitute when a bulk container is not available |
| refrigerant recovery recycling equipment, carefully | | | | each leg has its own can tap cans are installed |
| clean entire area around coupling nut to prevent | | | | onto each leg of multi-can dispensing valve in the |
| dirt entering system. Always use two wrenches | | | | same manner as the individual cans. |
| to avoid twisting or distorting lines and fittings | | | | CAN TAP INSTALLATION FLAT TYPE SEAL |
| 2. Cap or plug all LINES and FITTINGS | | | | CANS |
| immediately to prevent entry of air and moisture | | | | Recent findings by the EPA indicate that |
| into system. Do not remove these caps until | | | | refrigerant is harmful to the Earth's protective |
| connections are being made make sure you make | | | | Ozone layer. When discharging refrigerant avoid |
| every attempt to avoid discharging refrigerant | | | | allowing refrigerant to enter the atmosphere. |
| into the atmosphere. | | | | Refrigerant recovery system should be used |
| COMPONENT REPLACEMENT | | | | when discharging the system. |
| When components are replaced, system oil level | | | | First turn the handle outward to the fully open |
| must be adjusted. Add refrigeration oil to | | | | position. Securely engage locking lugs over the can |
| replacement component. See Mercedes oil Check | | | | flange, and lock them in place by turning cam lock |
| article, as well as, Component Oil Replacement | | | | or locking nut. Screw tap assembly into adapter |
| Quantities chart under "A/C SYSTEM SPECS" | | | | so sealing gasket is fully seated against the top. |
| article in this section. | | | | Turn tap inward to pierce the can and close the |
| USING R-12 REFRIGERANT. | | | | tap. DO NOT open tap until ready to purge the |
| 1. Always wear eye protection when around air | | | | service hose or dispense refrigerant into the |
| conditioning systemsair conditioning systems and | | | | system. |
| R-12. The system's high pressure can cause | | | | Be certain tap handle is turned fully inward to the |
| severe injury to eyes and skin if a hose were to | | | | closed position. Check that locking base is turned |
| burst. R-12 evaporates quickly when exposed to | | | | to its outer limit. Securely engage locking lugs |
| atmosphere, freezing anything it contacts. | | | | over the can flange. Turn entire tap assembly |
| 2. Use care when handling refrigerant containers. | | | | downward into the locking base to pierce the can. |
| DO NOT drop or strike containers or expose | | | | DO NOT open tap until ready to dispense into |
| refrigerant containers to excessive heat. | | | | system. |
| Containers must never be heated more than | | | | DO NOT open high side hand valve while air |
| (52°C) 125°F. Never expose R-12 | | | | conditioning system is in operation. This high |
| directly to open flame. | | | | pressure could rupture can or fitting at safety can |
| CAUTION: When R-12 is exposed to an open | | | | valve, resulting in damage and personal injury. |
| flame, drawn into a running engine, or detected | | | | CONNECTING LINES & FITTINGS |
| with a Halide leak tester, poisonous phosgene gas | | | | A new "O" ring should be used in all instances |
| is formed. Keep work areas ventilated. | | | | when connecting lines and fittings. Always use two |
| INDIVIDUAL R-12 CANS | | | | wrenches to avoid twisting or distorting lines and |
| Disposable refrigerant cans have a flat type seal | | | | fittings, tighten coupling nuts securely. |
| or a screw type seal, and proper can tap must | | | | PLACING SYSTEM IN OPERATION |
| be used for each type. Be sure sealing gasket on | | | | 1. Evacuate the system using a vacuum pump. |
| can tap is in good condition. A proper safety can | | | | 2. Charge the system with new R-12 according to |
| tap will prevent refrigerant from flowing back into | | | | each individual vehicle to Refrigerant Capacity. |
| open can, as tap has a one-way flow control. | | | | 3. Leak test the system, with particular attention |
| MULTI-CAN DISPENSING VALVES | | | | to all new connections and components. |
| A multi-can dispensing valve allows attachment of | | | | 4. Make a performance test of the system. |
| several cans of refrigerant, and is a good | | | | COMPRESSOR REMOVAL INFORMATION |
| substitute when a bulk container is not available | | | | On systems which have compressors equipped |
| each leg has its own can tap cans are installed | | | | with stem-type service valves, it is possible to |
| onto each leg of multi-can dispensing valve in the | | | | isolate the compressor for removal. |
| same manner as the individual cans. | | | | Turn both high and low pressure manual valves to |
| CAN TAP INSTALLATION FLAT TYPE SEAL | | | | extreme clockwise position. Loosen cap on high |
| CANS | | | | pressure manual valve connection to compressor |
| Recent findings by the EPA indicate that | | | | and allow gas to escape until compressor is |
| refrigerant is harmful to the Earth's protective | | | | relieved of pressure. |
| Ozone layer. When discharging refrigerant avoid | | | | COMPRESSOR REMOVAL INFORMATION - |
| allowing refrigerant to enter the atmosphere. | | | | DISCHARGE METHOD |
| Refrigerant recovery system should be used | | | | This procedure is to be used on vehicles which |
| when discharging the system. | | | | have compressor equipped with Schrader valves. |
| First turn the handle outward to the fully open | | | | In these cases, the compressor cannot be |
| position. Securely engage locking lugs over the can | | | | isolated and the system must be discharged, using |
| flange, and lock them in place by turning cam lock | | | | approved refrigerant recycling equipment. |