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to start with it will be high vacuum reading as suction is low pressure
secondly it means that the system is vacant of any gas and is well below 0 psi
if it is a high discharge pressure ( after the ac compressor) it means that the condenser is not being cooled by the fan or you have excessive gas in the system or the tx valve is blocked
I strongly suggest that you seek the services of an accredited ac specialist shop as r134a gas runs at a lot higher pressure that the r12 or r22 gas before you do serious damage to the ac compressor and system
HFC-134a ? Critical pressure is 588.9 a . With a 93 LL temp and 575 head, I would suspect 1. Air in system or 2. Ref. has gone critical. With a 110 psig suction/85 deg.F and a LL temp of 93 deg.F/125 psig
134a,but you shouldn't be adding anything to the sealed system,if you have a leak you have to first find the leak,then evacuate the system,fix the leak,hook up the vacuum pump and clean out the system and then add the correct amount of 134a,you just can't start adding refrigerant into the machine not knowing how much is in there,to much or to little will affect the way it will run and it's like a 25,000 dollar fine if caught releasing the gas into the air
Your head pressure is a little high, depending on the ambient temp and your suction pressure is a little low. The suction pressure should be around 68 psig, the equivalent of a 40 degree coil. You can try adding a little refrigerant, check your compressor amp draw. If head pressure keeps going up and suction doesn't come up you may have a restricted metering device or filter dryer
An Ultimate G has lots of suction. If you turn on your vacuum and the bag immediately inflates - that is how you can tell if your Kirby is moving air (suction). There is a more modern brush that came out with the Ultimate G Diamond and the Sentria that has stiffer bristles that dig up pet hair better.
Another way to test the suction is to spread some baking soda onto a hard floor and vacuum it up - you can see how much suction your Ultimate G has, or take off the vacuum head and put on a hose and test the suction at the end of the tube.
Ways to increase your Ultimate G cleaning efficiency. Take off the vacuum head and remove the brush roller. Attach your hose attachment and **** vacuum out the head. Put on a new belt, and remove any hair and or string or threads that may be wrapped around the brush roller. Put the roller back on and on the ends of your roller you will see that the ends spin and have numbers on them. If your vacuum brushroll is original - you could have your bristles rather worn and so you can align the #3 on BOTH sides of the brushroller. This would be a good time to consider upgrading to the Sentria Brush. Remove the bag, and replace with the CLOTH Kirby bag. It has the best filtration and it has the best airflow (which increases what you are referring to as suction). If you want to go the cheap route - at least get the paper Micron Magic with HEPA filtration (but it has slightly less air flow) Remove the side mini emptor from the vacuum and check to see if there is anything clogged up on either the vacuum or the mini-emptor. If your engine is running and inflating the bag and you replace the belt, the brush roller and to the cloth dust bag - your vacuum should pretty much run like a brand new Sentria Vacuum. Your vacuum system is outstanding, but may benefit from a little TLC if you have been neglecting it.
God day, Some thoughts. 1. Are the evap fan motors running, and at full speed. That would give you abnormally low suction pressure. 2. Cap tube sized too small. or partial restriction in the dryer cap tube/dryer when brazing in the lines. 3. Low ambient. What's the temp the machine is running in. 4. Over sized compressor. 5. Moisture. God, 134A is touchy on that one. 6. Was original cap tube soldered to the suction line to create a heat exchanger. Needed on many apps. Definately would cause flash back on start up. 7. Superheat a little low, should be 12 to 15 degrees.
This could be the reuslt of a faulty expansion valve .This valve is where high pressure liquid is converted to a low pressure gas inside the evaporator housing.It has a nitrogen charged "power head" that controls the amount of refrigerant through this valve which could be the reason you have un-stable suction pressures.Important to draw a good vacuum on the system after replacement and install the correct amount of refrigerant.