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Want to know operating pressures on a 134a refrigerator low and high

Want to know operating pressure on a refrigerator low side and high side a ball park

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Maximum efficiency is achieved when there is the greatest difference between high side and low side provided the low side stays under 30 psi or so. The low side pressures must stay low enough to cause the refrigerant to change states in the evaporator. If you see frost on the compressor suction line, there's too much refrigerant, and you'll overload the compressor. The correct approach, if you have the equipment and it sounds like you must have a gauge set but you need recovery to do this right, is to evacuate the sealed system, (a tight system will hold a vacuum overnight, but an hour is a good test if you suspect any leaks) and refill with the exact amount of refrigerant (by weight) as indicated on the ID tag.. Any system that will not perform when filled to that specification has either a bad valve in the compressor, or a restriction caused by contamination. Contamination is usually from moisture (humidity) introduced into the system by improper servicing, but is usually relieved if the system is under vacuum long enough to boil out the moisture. If the compressor is the culprit, it's usually game-over.

Posted on May 31, 2009

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I have a true refrigerator that uses 134A an refrigeration technician did not have any 134 A gas and substitute with Freon 2I have a true refrigerator that uses 134A an refrigeration technician did not have any 134 A gas and substitute with Freon 2. What effects would this have on this refrigerator?

Posted on Jul 14, 2009

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Substitutes refrigerants have very similar pressures as originals or sometimes a little higher but in both cases they achieve the same results.

Posted on Jan 05, 2015

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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Code on 2010 Enclave about the cooling fans running all the time while engine is on.Code is refrigerant pressure sensor cicuit low voltage. # is P0532-00.Does anybody know where sensor is located


DTC P0532: Air Conditioning A/C Refrigerant Pressure Sensor Circuit Low Voltage
The sensor gets 5 volt ref. voltage from the ECM - engine control module . Three wire sensor , all wires are to an from the ECM .

Circuit/System Description
The engine control module (ECM) monitors the high side refrigerant pressure through the A/C refrigerant pressure sensor. The ECM supplies a 5-volt reference and a low reference to the sensor. Changes in the A/C refrigerant pressure cause the A/C refrigerant pressure sensor signal to the ECM to vary. When the pressure is low, the signal voltage is low. When the pressure is high, the ECM commands the cooling fans on. When pressure is too high or too low, the ECM will not allow the A/C compressor clutch to engage.

Circuit/System Testing
Ignition OFF, disconnect the harness connector at the A/C refrigerant pressure sensor.
Ignition OFF, test for less than 10 ohms between the low reference circuit terminal 1 and ground.
? If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 2 and ground.
? If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
? If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
Verify the scan tool A/C High Side Pressure Sensor parameter is less than 0.1 volts (1 psi).
? If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the ECM.
Install a 3A fused jumper wire between the signal circuit terminal 3 and the 5-volt reference circuit terminal 2. Verify the scan tool A/C Refrigerant High Side Pressure Sensor parameter is greater than 4.90 volts (425 psi).
? If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
If all circuits test normal, test or replace the A/C refrigerant pressure sensor.

A/C Refrigerant Pressure Sensor
In the engine compartment, on the high pressure refrigerant line

Do you know difference between high an low side lines ?
between alternator an the compressor

Feb 07, 2018 | Cars & Trucks

1 Answer

Where is the orifice tube located on 88 buick park avenue


Inspect/Test/Replace To raise pressure, there must be a restriction in the air conditioning system. The restriction divides the system into the high side and the low side. The terms high side and low side refer to the high pressure and low pressure within the system.
The flow control can be either an orifice tube or a metering device called an expansion valve. A thermostatic expansion valve controls the amount of refrigerant that is allowed to flow to the evaporator. A temperature sensing bulb on the evaporator inlet controls the expansion valve.
  • A bad expansion valve will cause low readings on both the low and high side.
  • Failure of the sensing bulb is the most common problem.
  • Sometimes the valve can become plugged with debris.
  • If the sensing capillary tube is warm, there is high pressure that pushes on the diaphragm.
  • The sensing bulb checks the temperature of the outlet line of the evaporator.
  • If it is warm, it opens the valve.
  • Pressure on top of the diaphragm tries to push the valve open.
  • The operation of the expansion valve can be checked.
  • Some expansion valves can be cleaned, repaired or adjusted.
f73-15a.gif This system uses an expansion valve as it's flow control device. Some expansion valves are wrapped with insulation. When the sensing bulb is in the evaporator case, it does not need to be wrapped because it stays cold. When an expansion valve is packed in that type of system, it is only to silence the noise that the evaporator makes.

CAUTION
Only EPA-certified technicians can purchase R-12 refrigerant, since proper recovery and recycling techniques are required to prevent damaging the environment. Improper disposal of R-12 refrigerant can result in a fine.

Jun 06, 2012 | Buick Park Avenue Cars & Trucks

1 Answer

On an ac system how do i check the high & low preasure switches and what do these switches operate and what is the purpose of them?


If your 2003 Impala had a low pressure switch it would shut off the compressor if the low side pressure got to low. This would indicate that there is not enough refrigerant in the system an therefore not enough oil flow through the compressor so the compressor is shut down.

The high pressure switch, if your impala had one, would turn on the fan once the a/c pressure on the high side reached a certain pressure.

Switches are just that, they are either on or off. A low pressure is normally on and a high pressure is normally off (this can vary greatly depending on the car).

Your impala uses a pressure sensor. The sensor reports actual pressure data to the PCM which combines info from other sensor to determine what should be turned on and when.

Hope that helps. If you have any questions let me know and I'll see if I can answer them for you.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Oct 09, 2011 | 2003 Chevrolet Impala

1 Answer

Low side and high side readings


pressure readings vary depending on temperature, humidity, and other factors such as coil condition (inside and outside coils) ducting, other mechanical issues. The is no absolute readings for any one type of system, that said a ball park reading with an outdoor temp of 90deg and an indoor temp of 78deg it would be around 65 to 70 psi low side and 150 to 210 psi high side.

Sep 21, 2011 | Ruud Matching Split Air Conditioner

1 Answer

Would like to know if the 2 lines are both high pressure lines or is 1 high pressure and 1 low pressure this is on a 1993 chevy luminia car


  • 1 low side and 1 high side.
  • Here is a diagram of a standard car refrigerant operating system.
ironfist109_227.jpg


  • Hope this helps and thank you for using FixYa.
Regards, Tony

Aug 09, 2011 | 1993 Chevrolet Lumina

1 Answer

What the low and high side pressure for r410 freon


That depends upon the operating environment of the a/c system.The high side is directly related to the outside temperature and the low side depends upon the indoor temp, air flow across the evaporator coil, the relative indoor humidity and the static pressures of the duct system. There really is no rule of thumb to go by here but if all is operating properly then you should see something like this:

At 80° F the high should read from 277 psi to 295 psi with a clean condenser coil and the low will be about 116 psi to 130 psi or so if the blower and inside coil are functioning properly and the house temp is not too high or low.

*CAUTION*
If you are working with the high pressure of R410A refrigerant, also known by the trade name of Puron, then please take precautions to avoid accidental exposure of the face, eyes and exposed skin of the refrigerant and the POE oil it contains. Severe frostbite, lung damage and loss of eyesight may occur if exposure to raw refrigerant is experienced. Please consider calling a professional in your area to work on any refrigerant system.

Jun 16, 2011 | Goodman CKL42AR42 Air Conditioner

2 Answers

What should the pressures on the low and high side of the air conditioner read ?


low side should be about 30 psi at idle speed, high side 120 to 180 psi depending on ambient temp. higher temp, = higher pressure, as you increase engine rpm to say 1000 low side should drop to 10 to 15 psi & high side should increase about 30 psi. If high side goes over 280- 300psi you have contamination (air) in system or over charged with refrigerant. you will need to recover freon, evacuate & recharge system with proper amount of refrigerant. If the low side drops below 0psi or into vacuum then the refrigerant level is low, you will have to check for leaks , repair leaks & refill refrigerant.
Hope this helps
Paul T

Jun 01, 2011 | 1997 Chevrolet Suburban

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.

Jul 24, 2010 | Heating & Cooling

1 Answer

Need pressures for refrigerator


As long as you know you evacuated completely , then the high side doesn't matter too much . The low side should read about +10 , if your using R134 .

Sep 12, 2009 | Refrigerators

2 Answers

''does a new radiator need refrigerant added to it''


You need to replace the condensor, then take it to a shop to have the a/c system evacuated and recharged to purge moisture because the system was opened. That will cost around $150. You do not need to replace the receiver/dryer/suction accumulator even though they will tell you that you do.
go to car-part.com to find prices of condensor from salvage yards. Page with asterisk on it is the lowest priced part.

--------------------------------------
The Refrigerant Cycle
During stabilized conditions (air conditioning system shutdown), the refrigerant is in a vaporized state and pressures are equal throughout the system. When the A/C compressor (19703) is in operation it increases pressure on the refrigerant vapor, raising its temperature. The high-pressure and high-temperature vapor is then released into the top of the A/C condenser core (19712).
The A/C condenser core, being close to ambient temperature, causes the refrigerant vapor to condense into a liquid when heat is removed from the refrigerant by ambient air passing over the fins and tubing. The now liquid refrigerant, still at high pressure, exits from the bottom of the A/C condenser core and enters the inlet side of the A/C evaporator core orifice (19D990).
The A/C evaporator core orifice is the restriction in the refrigerant system that creates the high pressure buildup in the A/C evaporator core (19860) and separates the high and low pressure sides of the A/C system. As the liquid refrigerant leaves this restriction, its pressure and boiling point are reduced.
The liquid refrigerant is now at its lowest pressure and temperature. As it passes through the A/C evaporator core, it absorbs heat from the passenger compartment airflow passing over the plate/fin sections of the A/C evaporator core. This addition of heat causes the refrigerant to boil (convert to gas). The now cooler passenger compartment air can no longer support the same humidity level of the warmer air and this excess moisture condenses on the exterior of the evaporator coils and fins and drains outside the vehicle.
The suction accumulator/drier (19C836) is designed to remove moisture from the refrigerant and to prevent any liquid refrigerant that may not have been vaporized in the A/C evaporator core from reaching the A/C compressor. The A/C compressor is designed to pump refrigerant vapor only, as liquid refrigerant will not compress and can damage the A/C compressor.
The refrigerant cycle is now repeated with the A/C compressor again increasing the pressure and temperature of the refrigerant.
The A/C cycling switch (19E561) interrupts compressor operation before the external temperature of the A/C evaporator core gets low enough to cause the condensed water vapor (excess humidity) to turn to ice. It does this by monitoring low side line pressure. It is known that a refrigerant pressure of approximately 210 kPa (30 psi) will yield an operating temperature of 0°C (32°F). The A/C cycling switch controls system operation in an effort to maintain this temperature.
The high side line pressure is also monitored so that A/C compressor operation can be interrupted if system pressure becomes too high.
The A/C compressor pressure relief valve (19D644) will open and vent refrigerant to relieve unusually high system pressure.
Clutch Cycling Orifice Tube Type Refrigerant System 75cc8eb.gif
Item Part Number Description 1 19E762 A/C charge valve port (low side) 2 19E561 A/C cycling switch 3 19C836 Suction accumulator/drier 4 19703 A/C compressor 5 19D644 A/C compressor pressure relief valve 6 19D594 A/C pressure cut-off switch 7 19E762 A/C charge valve port (high side) 8 19712 A/C condenser core 9 19D990 A/C evaporator core orifice 10 19860 A/C evaporator core 11 — Low pressure vapor 12 — High pressure vapor 13 — Low pressure liquid 14 — High pressure liquid

  1. Connect the R-134a A/C Refrigerant Center to the low- and high-pressure service gauge port valves.
  2. Evacuate the system until the low-pressure gauge reads at least 99.4 kPa (29.5 in-Hg) (vacuum) and as close as 101.1 kPa (30 in-Hg) as possible. Continue to operate the vacuum pump for a minimum of 45 minutes.
  3. Turn off the evacuation pump. Observe the low-pressure gauge for five minutes to make sure that the system vacuum is held. If vacuum is not held for five minutes, leak-test the system, service the leaks, and evacuate the system again.
  4. Correctly oil match the system to verify that the correct amount of refrigerant oil is present in the system. For additional information, refer to Refrigerant Oil Adding in this section.
  5. Charge the system with the specified weight of refrigerant and refrigerant oil.
  6. When no more refrigerant is being drawn into the system, start the engine and select MAX A/C operation. Set the blower motor speed to maximum and allow the remaining refrigerant to be drawn into the system. Continue to add refrigerant into the system until the specified weight of R-134a has been added. Close the charging cylinder valve and allow the system to pull any remaining refrigerant from the hose. When the suction pressure drops to approximately 207 kPa (30 psi), close the charging hose valve.

May 14, 2009 | 1995 Nissan Maxima

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