Question about LG LSC121PMA Split System Air Conditioner

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The best pressure of gas in a split ac in

The best pressure of gas in a split ac 9000btu 12000btu &18000 in the outdoor unit in different seasons and in differents temperature

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65 psi is the ideal pressure remember its not exceede from this pressure.
and it is valid for all season

Posted on Jun 09, 2013

  • zil e muhammad Jun 09, 2013

    note that it is only for R-22 gas in A/Cs

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Should be around 70 psi on the low suction side if R22 is being used.
Suggest you read up on Superheat and Subcooling.

Posted on Jun 05, 2010

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Posted on Jan 02, 2017

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Whatis ideal r22 gas pressure required in 1 ton split ac of BlueStar.


Doesn't matter how big the unit is, pressures remain the same. On a satisfied temperature, approximately 75 degrees, r22 should be around 65 psi. The hotter the house, the higher the pressure. Head pressure varies on outdoor temperature. 90 degrees outdoor temp, approximately 200 to 225 psi on high side.

Jun 05, 2017 | Heating & Cooling

1 Answer

What are color of wires that goes to the temperature line switch that controls the defrost cycle?


PDF]4HP13/14 SPLIT SYSTEM HEAT PUMP - Armstrong Air

www.armstrongair.com/_/.../Armstrong_4HP13L_Install_506318-01.pdf
4HP13/14 SPLIT SYSTEM HEAT PUMP .... indoor unit, outdoor unit contains system refrigerant charge for operation ... may be installed with up to 50 feet of line set (no more than ..... The defrost control incorporates 2 pressure switch .... Note: Sensor resistance decreases as sensed temperature increases. Pins/Wire. Color.Missing: tempstar

[PDF]RESIDENTIAL SPLIT HEAT PUMP SYSTEMS

icpindexing.toddsit.com/documents/086477/42808100101.pdf
This Manual Supports Split Heat Pump Units of The Above Series .... two groups is based on a difference in Defrost controls and/or the .... completes a circuit between µRµ ? µOµ in the the thermostat sub-base. 2. .... before connecting line voltage. ...Wire "S1" is the first stage of electric heat through the outdoor thermostat.

[PDF]Trane Installer's Guide Air Conditioner/Heat Pump 4TTZ0 ...


Jan 18, 2016 | Heating & Cooling

1 Answer

WHAT IS REFRIGERANT SUCTION PRESSURE OF MY 1 TON SPLIT AC?


R22= 70-80psig
R410a=120-130psig
Depending on many variables such as blower speed, coils clean, indoor/outdoor temps.

Aug 05, 2015 | AMVENT 18000 Btu 1.5 Ton Ductless Mini...

1 Answer

Soleus dual mini split KFMHP18 fault error F1


F1 error code is a communication failure between the outdoor and indoor units. Check all inter-connecting wires. They should be minimum 14g stranded wire. Make sure all electrical connections are tight. These units are manufactured by CHIGO, you may try to contact them.

Aug 10, 2013 | Soleus Ductless Mini Split 18000 Air...

2 Answers

I have a Mitsubishi heat pump that runs well but the outdoor unit does not defrost what could be the problem.


Why does my heat pump ice up in Winter?
Heat pumps naturally ice-up in the winter. It is normal for the entire coil to be covered in a white frost and even light ice, during cold weather conditions. However, it is bad for the entire unit to be encased in ice. This indicates ductless heat pump problems which should be addressed quickly to save energy and avoid serious damage to your ductless unit. These systems should periodically go into a defrost cycle. This keeps the unit running efficiently. If the coils are blocked by ice, proper heat transfer between the coil and the outside air will not occur.
How does the defrost mode work?
When the mini split heat pump goes into defrost, the reversing valve inside of the outdoor unit is energized, switching the system from heat to the air conditioning mode. The outdoor coil becomes the hot, the indoor coil becomes cold, and both - the outdoor and indoor fans shut off. This allows the outdoor coil to melt accumulated ice. When the built-in micro-computer analyzes that all ice have been melted, the heat pump heating system goes back to heating mode.
sanyo-mini-split-defrost.pngA cloud of water vapor may be seen rising over the outdoor unit and a "whoosh" sound can be heard as the refrigerant reverses direction. The entire process usually takes up to 10 minutes (depending on conditions).
How often does the system goes into defrost mode?
Ductless mini-split heat pumps have different ways of determining when to go into defrost. The built-in microcomputer determines outdoor temperature, refrigerant pressures, and several other factors. In colder temperatures the system will go into defrost more often than in warmer.
If a ductless mini split heat pump is severely iced-up in the winter it is possible that it isn't defrosting (though there could be many other causes). Let the manufacturer certified technician check your system

Oct 29, 2011 | Mitsubishi Mr. Slim MXZ30TN Air...

1 Answer

Gas pressure


It depends on the indoor and outdoor temperature and humidity. The low side pressure can be in the area of 135# to 145# with an indoor temperature of 80° and 50% relative humidity, and the outdoor pressure can be in the area of 300# to 330# on a 95° day depending on effeciency rating.
If your asking this to charge your a/c this is not how to charge your a/c.
Charging AC by superheat and subcool
First charging a unit by superheat, this is only for Acs with an orifice or capillary tube.
Optimum superheat is 12° to 15° at the compressor or suction line outside the unit.
Hook up your gages and put a thermometer on suction line (large line), start the AC. Measure the temperature of the suction line and read the pressure on your gages. Theres a temperature scale on your gages for R-22 or R-410A the needle will show you the pressure on the outer scale and if you follow it down to the R-22 or R-410a inner scale that is the saturation temperature for that refrigerant, (you can also use a temperature pressure chart), now read the thermometer, let’s say the suction temperature( the thermometer) is 67° and the saturation temperature (the gages or temp. press. Chart), is 55°, subtract the saturation temperature from the suction temperature, 67°- 55° = 12° superheat.
Charging by Subcooling, this is for Acs with a thermostatic expansion valve, it’s common to see a sight glass on the liquid line (on these units with a sight glass just clear it, when, indoor room is at approximate set point of the thermostat). Optimum sub cooling is 12° to 15° at the outdoor unit.
Hook up your gages and put a thermometer on liquid line (small line), start the AC. Measure the temperature of the liquid line and read the pressure on your gages. Theres a temperature scale on your gages for R-22 or R-410A the needle will show you the pressure on the outer scale and if you follow it down to the R-22 or R-410a inner scale that is the saturation temperature for that refrigerant,(you can also use a temperature pressure chart), now read the thermometer, let’s say the liquid temperature( the thermometer) is 100° and the saturation temperature (the gages or temp. press. Chart), is 114°, subtract the liquid temperature from the saturation temperature, 114°- 100° = 14° subcool.

Dec 25, 2009 | Heating & Cooling

1 Answer

Hi. I have a failed indoor controler on a hitachi ducted aircon. mod ras-5hz. inverter. can I replace it with other type. Unit 15 yrs old and parts not available. What is the control voltage between indoor...


Hi, the control voltage to both indoor and outdoor will always be 24 volts AC. If this is a heat-pump unit, the high voltage to the indoor and outdoor will be the same, 208/ 230/ 240/ 277. If it is a split unit with a gas fired unit, the outdoor will be 208 or higher and the indoor will be 120volts AC. I'm sorry, you have the inducer motor, so it is gas! My mistake. Yes, always the gas furnace will be 120 volts AC and the remote condenser will always be 208 and higher. As far as replacing the inducer motor with a different kind, it will have to be the same voltage, 120, and amps, R.P.M's, 60hz, and made to pressurize and be able to vent Hot gases also. It must fit and operate like the old one. They should make a replacement universal motor to fit? Check with some of the wholesale houses on this and they can locate a motor to fit. Keep me updated on this please Don.
Shastalaker7

Dec 18, 2009 | Hitachi Heating & Cooling

1 Answer

Samsung 1.0 ton(split) AC stops working during 36-37 degree C.


i believe you have a high pressure switch on your condenser that is going bad .it is a switch that has two red wires connected to it inside your outside unit

Feb 11, 2009 | Samsung Heating & Cooling

1 Answer

Regarding gas pressure


ok lets see how i can help you. If the units low on gas, suspect a refrigerant leak!! 2nd, what refrigerant it's using? I can't tell you operating pressures if you don't know the refrigerant. (usually the label on the indoor unit right side says refrigerant charge and type.) 3rd desired temperature for cooling is about 68-72 F that's about 20-22 Celsius.

id keep it on 21 C

Apr 22, 2008 | LG LSC091PMA Split System Air Conditioner

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