20 Most Recent Whirlwind FH-778 Air Conditioner - Page 3 Questions & Answers

Here is a link to a site that explains the concept of how to read a chart. Their example is using R404A; however, the basic principles of reading a PH chart are the same. Assuming you have a R134A chart, you need only apply the principles to your chart.

Another site that may be helpful. This one is using a 134A chart for their example.

I hope you find this information helpful to you. Good Luck in your endeavor! :-)

Whirlwind FH-778... | Answered on Jun 14, 2011

System Inspection
Although the A/C system should not be serviced by the do-it-yourselfer, preventive maintenance can be practiced and A/C system inspections can be performed to help maintain the efficiency of the vehicle's A/C system. For A/C system inspection, perform the following: The easiest and often most important check for the air conditioning system consists of a visual inspection of the system components. Visually inspect the air conditioning system for refrigerant leaks, damaged compressor clutch, abnormal compressor drive belt tension and/or condition, plugged evaporator drain tube, blocked condenser fins, disconnected or broken wires, blown fuses, corroded connections and poor insulation.
CHECKING FOR OIL LEAKS Refrigerant leaks show up as oily areas on the various components because the compressor oil is transported around the entire system along with the refrigerant. Look for oily spots on all the hoses and lines, and especially on the hose and tubing connections. If there are oily deposits, the system may have a leak, and you should have it checked by a certified air conditioning specialist.
Fig. 1: Run your hand along the underside of all hose connections and check for leaks. If you find a leak, have it fixed by a certified air conditioning specialist.
check%20ac%20leak.jpg KEEPING THE CONDENSER CLEAR Periodically inspect the front of the condenser for bent fins or foreign material (dirt, bugs, leaves, etc.). If any cooling fins are bent, straighten them carefully. You can remove any debris with a stiff bristle brush.

Fig. 1: The position of the condenser in front of the radiator makes it particularly susceptible to collecting debris. Periodically, remove the accumulated bugs, leaves and other trash from the condenser. ac%202.gif
CHECKING THE REFRIGERANT LEVEL There are two ways to check refrigerant level. On vehicles equipped with sight glasses, checking the refrigerant level is a simple matter. Many late model vehicles, however, do not have a sight glass, and you have to check the temperature of the lines to determine the refrigerant level.
With Sight Glass The sight glass is normally located in the head of the receiver/drier. The receiver/drier is not hard to locate. It's a large metal cylinder that looks something like a fire extinguisher. Sometimes the sight glass is located in one of the metal lines leading from the top of the receiver/drier. Once you've found it, wipe it clean and proceed as follows:
  1. With the engine and the air conditioning system running, look for the flow of refrigerant through the sight glass. If the air conditioner is working properly, you'll be able to see a continuous flow of clear refrigerant through the sight glass, with perhaps an occasional bubble at very high temperatures.
  2. Cycle the air conditioner on and off to make sure what you are seeing is clear refrigerant. Since the refrigerant is clear, it is possible to mistake a completely discharged system for one that is fully charged. Turn the system off and watch the sight glass. If there is refrigerant in the system, you'll see bubbles during the off cycle. If you observe no bubbles when the system is running, and the airflow from the unit in the vehicle is delivering cold air, everything is OK.
  3. If you observe bubbles in the sight glass while the system is operating, the system is low on refrigerant. Have it checked by a professional.
  4. Oil streaks in the sight glass are an indication of trouble. Most of the time, if you see oil in the sight glass, it will appear as a series of streaks, although occasionally it may be a solid stream of oil. In either case, it means that part of the charge has been lost.
  1. Fig. 1: Oils streaks (A), constant bubbles (B) or foam (C) indicate there is not enough refrigerant in the system. Occasional bubbles during the initial operation are normal. A clear sight glass indicates a proper charge of refrigerant or no refrigerant at all, which can be determined by the presence of cold air at the outlets in the vehicle. If the glass is clouded with a milky white substance, have the receiver/dryer checked by a certified air conditioning specialist. ac%203.jpg

Without Sight Glass On vehicles that are not equipped with sight glasses, it is necessary to feel the temperature difference in the inlet and outlet lines at the receiver/drier to gauge the refrigerant level. Use the following procedure:
  1. Locate the receiver/drier. It will generally be up front near the condenser. It is shaped like a small fire extinguisher and will always have two lines connected to it. One line goes to the expansion valve and the other goes to the condenser.
  2. With the engine and the air conditioner running, hold a line in each hand and gauge their relative temperatures. If they are the same approximate temperatures, the system is correctly charged.
  3. If the line from the expansion valve to the receiver/drier is a lot colder than the line from the receiver/drier to the condenser, then the system is overcharged. It should be noted that this is an extremely rare condition.
  4. If the line that leads from the receiver/drier to the condenser is a lot colder than the other line, the system is undercharged.
  5. If the system is undercharged or overcharged, have it checked by a professional air conditioning mechanic.
Fig. 3: Checking the refrigerant charge if the system has no sight glass. ac%204.jpg

Whirlwind FH-778... | Answered on Jun 07, 2011

If you have a set of gages all you have to do is hook up to the ports. Blue gage / line to the large tube. Red gage / line to the small tube. Hook up ports are usually right at the bottom of the unit where the tubes connect to the unit. On some, the ports are inside the unit in which case you have to remove the access panel in that location. First, clean the outside coil, you can use a water hose with not to much pressure and wash out any leaves, dirt, old grass clippings. Wash out the coil fins and pay attn. to the bottom area. The best way, to make sure your unit is full of freon, is to check the temp of the large line at the unit (while it is running w/ max load across inside coil) and check the saturated refrigerant pressure, looking for a differential of 15 to 20 dges. OR With a clean coil, running with about 225 psi on the red gage, you will want about 65 to 70 psi on the blue. These numbers are just for referencing only.You really need to check the temp. of the suction line and using a saturated R22 pressure to temp. chart. (found at any local refrigerant supply house) adjust pressures and temps until a desired temp. is achieved (15 - 20 ) called super heat at the compressor suction line. Hope this helps Fix Ya up.

Whirlwind FH-778... | Answered on Jun 01, 2011

Check to see if the condensate pipe is plugged. If you can blow some compressed air down the condensate pipe.

Whirlwind FH-778... | Answered on Jun 01, 2011


Here is a tip about troubleshooting your air conditioner...
There are many things that can cause your air conditioner not to cool...

AirConditioner Trouble - Review the Possibilities


Whirlwind FH-778... | Answered on May 11, 2011

I assume that you are talking about the pressures in the refrigeration system.
These pressures are affected by many variables. The type of refrigeration, the temperatures of the inside and outside air, the type of compressor and many other factors.
In short what I am saying is that it is impossible to give you the information you are looking for in this type of forum. Those can only be given once there is a full assessment of the situation.


Whirlwind FH-778... | Answered on Apr 18, 2011

Check to see if you have power at the outlet.

Whirlwind FH-778... | Answered on Oct 13, 2010

crush it!

Whirlwind FH-778... | Answered on Sep 28, 2010

dear sir

if you have some knowledge about air conditioner system then first connect hose with suction side of aircon pipe conector(valve) with Gage and second hose with cylinder and GAGE .during of this you must remember don,t forget to open valve before START this job then make your ac unit vacuum it should be 18-20 micron after vacuum fill freon (approxmatily 60-65 pci)
and check your aircon system,s evaporator all pipe has been cold not and any pipe is getting ice on it .if its reach pressure 60-65 psi AND YOUR AIRCON BLOWING COLD AIR then it,s good the close by cup nut on the connecting point and remove hose from connector and disconnect Gage from system .
(but please don,t do if you have not proper knowledge it can be dangour)
warning: if you don,t have knowledge to do this please don,t try

thank you
hope answer the question

Whirlwind FH-778... | Answered on Sep 25, 2010

Check the thermostat ( thermistor) wire. Compressor engaging latch/solenoid. Hope the gas has not leaked !!

Whirlwind FH-778... | Answered on Sep 24, 2010

dear sir/madam

please try to check first airconditioner,s comressor, its working or not if it,s working and not getting cold then it can be low gas problem andf it,s need to refill freon gas ,i will leave it,s up to you for contact to a/c technician for refill gas or refill by yourself ( if you know how to refill gas)

thank for using fixya for your air conditioner,s problem
hope answer the question
please vote!

Whirlwind FH-778... | Answered on Sep 16, 2010

dear sir /madam
please do every week clean your split type a/c,s filter it,s main coz who responsible for block the drain water line and after that split indoor drain ac unit drain water from inside of the unit , try to find out the drain water line of indoor unit of air conditioner the make clean it and also check it i mean keep some fresh water for make test its drain line it have been open or not if water is going easily then ,it,s ok
it,s up tp you if you think you can do it or contact to it,s technician for do solve this problem.

thank you for using fixya for get solution
hope answer the question
please vote!

Whirlwind FH-778... | Answered on Sep 16, 2010

dear sir /madam
please make sure first your air conditioner unit is clean and it,s out side i mean hot ( condenser )side fan motor is working and it,s getting same result then it can be low gas problem ,it,s need to refill the gas so please contact to trained technician for refill the gas.

hope answer the question
thank you
please vote!

Whirlwind FH-778... | Answered on Sep 16, 2010

dear sir /madam

please check first your a/c is heat/cold model or not if it,s then please make it on cool mode by remote controllar coz it can be work on both mode by one valve .and if it,s only cool type of air conditoner unit and it,s copressor is working then there can be low gas problem ,i leave up to you to take decision for refill gas by yourself or contact to maintenance personnel for find out the lekage and brazing it after refill the refrigarant gas.

thanks for using fixya for solution of your a/c problems.

hope answer the question
thank you
please vote!

Whirlwind FH-778... | Answered on Sep 16, 2010

first you have to have a EPA certification too purchase, and to handle Refrigerant. in order to stop the leak first it must be located and in most cases soldered shut depending on the leaks location if the leak is in the tube sheet of the coils it my be better to replace the leaking coil. if the leak can be repaired the refrigerant must be removed from the system, leaving it in a vacuum then bring it up to atmospheric pressure (0 psi) using dry nitrogen. then the leak can be repaired, after leak has been repaired pressure test system at 120 psi for 20 min. watching gauges to see if pressure drops. If pressure holds, release nitrogen then evacuate system with vacuum pump. most manufactures require a 500 micron of less vacuum to ensure no moisture is in system then charge system according Manufactures Specification. charging and service ports are normally located at outdoor condensing unit where copper piping connects too condenser, charging manifolds are a necessary tool for this repair. I would highly recommend having a HVAC contractor preform this repair, amount of refrigerant that goes into the system is critical to performance of heat pump operation.

Whirlwind FH-778... | Answered on Sep 16, 2010

Hi, just to let you know and to be honest to you on this problem, if you are not a certified service tech, and certified through the E.P.A with your card, you can't even buy any type of refrigerant other then what they sell for your auto now the R-134a. You are going to have to have this done for you. R-407 comes only in 30lb. jugs from a/c wholesale only places for certified contractors, and we must show our certification card that we have been through school for safe handling of all freon. This law went into affect in 1992, so I am sorry to give you this news. If you know this is the problem for sure, make some calls to a/c repair companies to see what they will charge you to check this out for you. I wish you the best of luck on this, but this has been the law for a lot of years. The R-134a that you can buy is ozone friendly, so you can buy it but no other kind as there are over 100 different types of freon on the market. Best of luck to you on this.
A/C, Heating & Refrigeration Contractor

Whirlwind FH-778... | Answered on Aug 27, 2010

No.... they are totally different gases and if you mix them you are really in trouble.... only use the specified gas and NEVER mix gases!!


Whirlwind FH-778... | Answered on Aug 27, 2010

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