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Usually do not add any. If the system is flushed, then all old oil is out. The new compressor should have enough oil for a complete system. They basically want you to measure what came out of the old compressor and have that same amount in the new one. But you must have more than that because some oil is going to be in the evaporator, condenser and the drier. about 3 oz should do it. be sure to replace the drier.
Without more info I will have to give you several things to look at. Typically during the hot months rotary units experience temperature shut downs due to the following. Dirty oil coolers. Blowing them out with air my help some but ideally they need to be washed using a degreaser solution. Location. during the hot months poor air flow/ air removal may let heat from the compressor build up in or under the cover or room. This hot air gets drawn in by the compressor and raises the compressor temperature. The cycle continues until the compressor shuts down on high air temp. Maintenance. Poor maintenance on rotary screw compressors leads to shut downs on high temp, high air temps then play havoc on dryers which causes moisture in the air system. Maintenance items that need replacing regularly ( about 2000 hrs) oil filter, air filter, Depending on type of oil used change 2000 to 8000 hrs, seperator @ 8000 hrs. Also the amont element will cause high temps if bad. It is located where the three oil lines come together. There should be 4 screws that hold the cover on. the cover also has a hose connected to it and located close to the oil cooler. This amont element acts like the thermostat in your car. it lets oil bypass the oil cooler or causes more oil to go thru the cooler. the cooler oil and bypass oil mixes and maintains a certain temp. air end temp should run about 195 F and injected temp about 165 F. hope this helps. if you can give more detailed info I can get you closer to your problem.
Does the motor rotate the compressor or just set there and hum? How old is this unit? Overload heaters may be to small or unit may be single phaseing. Is there air pressure in the tank when this happens.
Check your safety valve is closed
by pulling it out and releasing it. You can use a mixture of dishwashing soap
and water to drip on the valve to see if it makes bubbles identifying a leak.
Next make sure the petcock valve on the bottom of the tank is closed and not
leaking by using the soapy water again. If you cannot close or fix the valve
replace it. The next trouble shooting will require checking the air input to
the tank but be careful since the tubes could be hot.
make sure oillevel is ok
make sure cooler is clean
make sure air is going trough cooler(fan works)
also means doors and panels closed.
if that is all correct, there have to come out a lot of hot coolingair out of the machine.
otherwise the thermostatic 3 way valve doesnt function
open for about 1/2 inch or replace
It's just too hot. Blow out the radiator weekly. There is an oil temp switch that might need replaced but the radiator is the most common problem with screw compressors. You can check the settings in the control panel, where you turn it on and off. It should be set for a high temp of 185°.
Check to see if your compressor is running. Thre are 5/16 screws on either side of the unit holding it to the case. Take those out and you can get to the cpmpressor. These are not complicated units but you may have to have a service tech look at it for you. I do sell a lot of these PTAC units so if your compressor is running you have leak or bad compressor. Russ
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