REFRIGERANT OIL
Only new, pure, moisture-free refrigerant oil should be used in the air conditioning system. This oil is highly refined and dehydrated to a point where moisture content is less than 10 parts per million. The oil container must be tightly closed at all times when not in use, or moisture will be absorbed from the air and introduced into the refrigeration system.
DISCHARGING SYSTEM
| CAUTION | When discharging air conditioning system, use only approved refrigerant recovery/recycling equipment. Make every attempt to avoid discharging refrigerant into the atmosphere. |
If compressor has stem-type service valves, it can be isolated and removed without discharging entire system. Otherwise, discharge system completely using approved refrigerant recovery/recycling equipment before loosening any fittings.
DISCONNECTING LINES & FITTINGS
After system is discharged, carefully clean area around all fittings to be opened. Always use 2 wrenches when tightening or loosening fittings to avoid twisting or distorting lines. Cap or plug all openings as soon as lines are removed. Do not remove caps until immediately before connections are made. This will keep entry of air and moisture to a minimum, reducing the chance of damage to components.
PLACING SYSTEM IN OPERATION
After component service or replacement has been completed and all connections have been made, evacuate system thoroughly with a vacuum pump. Charge system with proper amount of refrigerant and perform a leak test. Be sure to check all fittings that have been opened. After system has been leak tested, make a system performance check.
FS-6, 6E-171 & 6P-148 6-CYLS.
When inspecting the system to determine oil loss, check for signs of leaking (a wet, shiny looking spot on system components). If a component is removed after the system has been operated, some oil will remain in the component. If oil leak is noted or components replacement is required, oil will have to be restored to original level, as follows
DURING COMPRESSOR REPLACEMENT
Discharge system using approved refrigerant recovery/recycling equipment and replace components as necessary. A new compressor contains 10 ounces of new refrigeration oil. Prior to installing new compressor, drain 4 ounces of the oil from new compressor. This will maintain total system charge of 10 ounces.
DURING COMPONENT REPLACEMENT
When replacing components other than the compressor, oil must be added to new component to maintain system charge at 10 ounces. If evaporator is replaced, add 3 ounces; if the condenser is replaced, add 1 ounce.
If accumulator is to be replaced, remove accumulator. Drain oil from old accumulator and measure amount removed. Before installing new accumulator, add the same amount of oil plus 1 ounce.
COMPRESSOR FAILURE & SYSTEM CONTAMINATED
If either of these situations exists, discharge system using approved refrigerant recovery/recycling equipment and remove compressor, accumulator and orifice tube. Inspect orifice tube for contaminants. Clean and replace as necessary. Flush entire system. Install a new compressor (if necessary) and a new accumulator. New compressors are charged with proper amount of oil, 10 ounces. If reinstalling old compressor, add 10 ounces of new refrigeration oil through suction port. Evacuate and charge system.
10P15, 10P15C & 10PA20 10-CYLS.
To ensure that the Nippondenso 10-cylinder compressor has the proper amount of lubricating oil, discharge the system using approved refrigerant recovery/recycling equipment and remove the compressor. Remove the service valve assembly. Turn the compressor upside down and drain the oil from it. Once the oil has been drained, refill the compressor with 2.0-3.4 oz. of Denso oil 6, Suniso No. 5GS or equivalent compressor oil.
TECUMSEH HR 980, 4-CYLINDER
The Tecumseh 4-cylinder compressor system requires a refrigeration oil charge of 8 ounces. If a component is removed from the system, some oil is lost with that component. The procedures for replacing oil are as follows
A new compressor comes charged with 8 ounces of refrigeration oil. Before installing the compressor, drain out 4 ounces from the new compressor. This will maintain the system total charge within the 8 ounce limit.
When replacing the evaporator, add 3 ounces; for the condenser, add 1 ounce. If an accumulator is replaced, drain oil from accumulator through the pressure sensing switch fitting (Schrader valve removed). Measure the amount of oil removed, and add that amount plus 1 ounce to the new accumulator. No oil needs to be added to compensate for loss when valves or hoses are replaced.