Hey im converting my 1566 from r12 to r134a and i have adapters that go on the compressor. both of them are the same size, so what side is high pressure and what side is low pressure. I have a red and a blue adapter. What one goes where, inside (closest to the motor), or outside (away from the motor). Also how many lbs of refrigerant does the system hold? Any other pointers would be great. thanks.
- Thread starter jdetig1
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Super-H-Mike
Member
High side or discharge line should go out to condensor in the front of the radiator. Low side or suction line goes out to the evaporator coil in or near the cab. I dont know the capacity of refrigerant. In automotive , I use Ester oil when converting systems. The pressures and performance is always slightly different than when the system had R12.
Super-H-Mike
Member
Red is high, blue is low.
glennster
Well-known Member
as far as charging, use about 80 % of r-134 as opposed to r-12. example if the system uses 2 lbs of r-12, 2 lb x .8 = 1.6 lbs of r-134. also, like super h mike said use ester oil. if you cant find the capacity of the system you can ball park it with charging gauges. low side pressure at about 80 degrees f should be around 45 to 48 psi. high side should be around 200 psi (roughly). evac the system with a vaccuum pump for about an hour, then let the vacccuum hold for another hour to see if there is a leak. (vaccuum will drop if leaking) generally about 28 inches of vaccuum is where we pull the system.
Super-H-Mike
Member
Good advice, I sometimes charge them by pressure and performance too when it is a modified or unknown system and you can get it to work fine that way. Those older systems sometimes took a lot of R12, wouldnt suprise me if a 1566 took 3-4 or more lbs. BUT, More is not better with AC, in other words dont overcharge it ! A gauge set would really help you get it right.
well both lines come off the compressor and go to the cab, both the evaporator and condenser are on the cab, so i cant tell which line goes where. One line is closer to the motor and the other line is close to the inside of the side hood. How do you get ester oil into the system and how much do you put in? I will use gauges to charge the system.
Super-H-Mike
Member
No "S" or "D" markings on compressor? Is one line larger than the other one?
Owen Aaland
Well-known Member
On the 66 series tractors the condenser is located on the back of the cab. The evaporator is inside the cab. If you still have the original York compressor there should S and a D cast into the compressor head. The larger hose hose will be the low side and the smaller hose the high side. You will also need to replace the oil with the correct oil for R134A. Charge the system to about 80% of the total capacity for R12 refrigerant.
R12 charge 71 to 80 ounces
Oil 6 to 12 ounces
Oil level 7/8 to 1-7/16
R12 charge 71 to 80 ounces
Oil 6 to 12 ounces
Oil level 7/8 to 1-7/16
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