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I hook my gauges to the condensing unit on the A/c I'am working on. The problem I am trying to solve is: High side pressure is going up and down from 300 to 400 every 10 seconds. This system dose not have exspansion valves. what is going on?

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Im thinking you might be over charged...too much gas..it will pop off on high head if over 400...other wise no airflow through the condenser will cause this

Posted on Jul 13, 2009

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Your question was somewhat confusing. It sounds like you may have a set of gauges that you hooked up to your high or low side? Without a proper set of gauges to read the pressures it would be hard to properly assess the problem. A/C is all about pressure/tempeture Depending on the age of your car, you have r-12 or post 90' or so 134-a. Whatever the temperature is that day your pressures should be within a range . If it's too hi or low would indicate a problem. In the mean time it never hurts to clean your coils in a car you're probably only going to be able to clean the condenser. So I guess I would have to need to know what refrigerant you have and what were the pressure readings. You did say that when you turned on your AC the compressor was working?

Jun 06, 2016 | AC Cars & Trucks

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What causes high pressure on the low pressure side of the a.c. unit


Low side and high side pressures are high. Usually indicates an over charged system. do you have a charging guage! if not, go to any auto parts store to get one. advanced auto, auto zone ETC, this guage will tell you the correct amount of freon to put in it, on the low side only.

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1 Answer

COMPRESSOR ON & OFF FREON LEVEL OK


You need to hook up a gauge and read the pressures on the low and high side. It will cut out if the pressure drops too low or goes too high. If it was properly evacuated and charged I would assume it is probably high pressure cut out which would be indicative of a plugged orifice tube or restriction in the system (line, condenser, evaporator.

Jul 06, 2011 | Chevrolet Colorado Cars & Trucks

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I have the correct Manifold Gauges for checking the low and high side of the heat pump. How do I read the gauges to ensure that my system has the right charge? Outside ambient temperature is 85.4.


In order to know if you have the correct charge you must measure the subcooling since it is a txv unit. The outside unit will have the proper subooling you need printed on the data plate. Hook up you gauges and let thebunit run for 10 minutes, after 10 minutes check the high side pressure, that high side pressure will correspond to a saturation temp, write that number down then measure the temp of the liquid line and subtract the saturation temp from the liquid line temp, it should be the same as printed on tjhe data plate if it is higher than that add refrigerant untill you get whtas printed on tne data plate. Is there is no data plate use 12 degrees of subcooling.

May 27, 2011 | Heating & Cooling

1 Answer

Hi, I need to relocate the split air conditioner, but I don't know the first step and next steps. Thank you,


If you are not a service technician you probably won't have the tools you will need to accomplish the move. Here is what it takes, step bye step. 1. Pull the fuses or turn off the electrical breaker in the house. 2. Hook up a gauge manifold to the Condensing unit ports for the liquid and suction lines. 3. Hook up a Refrigerant recovery machine to the manifold. 4. Recover the refrigerant into recovery tanks down to a trace, no vacuum. 5. Disconnect the electrical whip and control wiring from the condenser. 6. Close off the service valves on the liquid and suction lines at the condenser. 7. Slowly unscrew the copper line connections to the condensing unit to relieve any pressure that may exist from Refrigerant boiling out of the oil in the compressor and quickly cap them. 8. Move the unit to your new, firm and level location. 9. Remove the old electrical disconnect and whip and move it to the condenser. 10. Buy a new line set of the proper length or extend the old one with Refrigeration copper and couplings preserving the condenser couplings. 11. Replace the liquid line drier and reconnect the copper lines to the condensing unit. Replace the "O" Rings if needed to insure a good seal. 12. Hook up a vacuum pump to your gauge manifold. 13. Open the isolation valves on the condenser. Depending on the oil type in the system, evacuate to 250 Microns. 13. Charge system with 50 pounds of Nitrogen and a little Refrigerant for a trace test. 14. Watch your gauges for a drop in pressure indicating a leak. 15. Check all fittings and any splices with a good Halogen gas detector. 16. Evacuate the system again to the point of vaporization of the oil in the compressor being careful not to boil it off. 17. Close off all ports on your manifold and install a small drier to your Refrigerant line. 18. Re-install the recovered Refrigerant, running it through the small drier on your manifold. 19. Re-check for leaks. 20. Install the electrical whip on the contacter and the control wires on the contacter coil. 21.Start the AC and check the running amps against the name plate Full Load Amps (FLA) or Regular Load Amps (RLA) and check the Refrigerant charge against the units chart. Either in your owners manual or glued to the electrical access cover.
Method 2 = Instead of recovering the refrigerant, you can pump it into the condensing unit. With your gauge manifold tied in, close the liquid line isolation valve. Run the compressor till the compound gauge reads 1 pound and close the suction line isolation valve. Doing it this way will eliminate the need for the recovery machine and heavy tanks. All else remains the same.
Special tools needed = Compound gauge (meaning it reads both pressure and vacuum). High pressure gauge, gauge manifold and at least 3 hoses, a vacuum pump, leak detector (or soap bubbles) and an amp probe. Please rate this response. Thanks for asking!

Apr 01, 2011 | Heating & Cooling

1 Answer

How do i replace ac condenser?


You will need a vacuum pump, manifold gauges, and new refridgerant. You will also need a recapture device to prevent your old stuff from going into the air. Remove the lines from the condenser. Remove the condenser. Draw down the system with the vaccum pump. Recharge the system using the manifold gauges to give the correct high side and low side pressures. This is not a do it yourself kind of job unless you work as a mechanic for a living.

Mar 15, 2011 | 2005 Pontiac Grand Prix

1 Answer

How do i hook my manifold gauges to my residental condensing unit to check pressures


The AC manifold gauges set have the three chambers: the low pressure chamber (left side), utility chamber (middle), and the high pressure chamber (right side).

When technicians connect the HVAC manifold gauge to the air conditioner units, he connects the low pressure side of air conditioner unit to low pressure gauge side.

If he wants to read the pressure in discharge line he connects the high pressure gauge hose to the air conditioner high pressure side.

The utility port (the middle chamber) is a place you connect the hose to vacuum pump, recovery units or add or remove refrigerant from AC units.

Air conditioning gauges is used to measure air conditioner units pressure within closed-system to evaluate or troubleshoot the AC units. Gauges manifold set is the most frequently used item when it comes to refrigerant or pressure.

Air conditioning gauge set allows the HVAC technician to check AC units operating pressures, transfer AC refrigerant, pressure test system, purge the system with nitrogen, and perform other necessary tasks.

The gauges manifold set includes the hoses, the manifold, the valves, the compound gauge (low pressure gauges) and high pressure gauge.

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1 Answer

Need air cindition recharge, don't have cash to take it someplace, can you help with instructions to do this


YOU NEED A R-134 GAUGE SET TO CHECK LOW PRESSURE SIDE AND HIGH PRESSURE SIDE.YOU ALSO CAN BUY A LITTLE CHEAPER GAUGE TO CHECK YOUR AC LOW BLUE SIDE AND HIGH RED SIDE AT ANY AUTO ZONE OR ADVANCE AUTO PARTS.WHAT YOU DO WHEN YOU GET YOUR GAUGE SET HOOK GAUGE TO LOW PRESSURE SIDE BLUE CAP PORT AND GAUGE TO HIGH SIDE PRESSURE RED CAP PORT.YOU CRANK CAR UP GET IT OPERATING TEMPERATURE.THEN TURN AC ON HIGH COOL LET RUN 3 TO 4 MINUTES.CHECK LOW SIDE GAUGE READING SHOULD BE 28 - 32 PSI. HIGH PRESSURE SIDE GAUGE SHOULD 199 - 228 PSI. THATS NORMAL CHARGE. SEE YOU CANT JUST RECHARGE AC SYSTEM UNTIL YOU CHECK IT FIRST YOU WILL DAMAGE SYSTEM .NOW YOU CAN GO TO AUTO ZONE PARTS BUY A CHARGE CAN WITH GAUGE AND HOSE.ATTACH TO IT.YOU NEED MORE THAN ONE CAN.WARNING MAKE COMPRESSOR IS RUNNING WHEN YOU TURN ON AC .BECAUSE IF COMPRESSOR NOT RUNNING CHECK FUSE AND AC COMPRESSOR RELAY.IF BOTH OKAY.YOU COULD HAVE OPEN CLUTCH COIL A FAULTY LOW PRESSURE SWITCH WILL CAUSE AC NOT TO WORK. IF LOW PRESSURE GAUGE BLUE SIDE PRESSURE IS 28 OR 30 YOU DONT NEED A CHARGE.PROBLEM SOME WHERE ELSE.BE SURE TO WEAR SAFETY GLASSES WHEN WORKING ON AC SYSTEM.

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2 Answers

For my thesis: 5 condenser problems and 5 solutions


Problem number one.

condenser fan won't come on. solution check the capacitor if good ohm out the fan to see if it is bad. If bad replace fan motor with new one.

2. compressor will not come on. solution check the contactor to see if engaging this applies to problem 1 also. If engages check the capacitor on the herm side if it is bad replace. If good check compressor to see if the compressor is bad. Should it be bad replace compressor.

3. High head pressure not cooling properly dirty condenser coils. Clean coils. With hose and water.

4. Low head pressure frosting accruing on suction line. Check freon levels. Also check inside air filter for being dirty.

5. Condenser unit is failing to come on. solution check the power source check the contactor should the main power be bad check main breaker and replace any slow blow fuses that are bad. Should the contactor be bad check transformer to ensure 24 volts going to secondary side on contactor. Inspect the two wire going to outside unit condenser. replace any broken wire any bad transformer or bad contactor.

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1 Answer

How to hookup refrigerent gauges to central air?


Outside in the condensing unit you'll see the two copper pipes coming from the valves in the condensing unit. atach the hose from the high pressure gauge to the port in the smaller copper pipe (liquid line) and the other hose to the port of the other line (suction line) in there you check the low pressure (68psi) and if is low you can rechrge it, in the high side you should have no much more than 250psi .This pressures are for R22.

Apr 25, 2009 | Heating & Cooling

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