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How do i connect air conditioning outside unit to the inside unit, can it be done with out a vacuum pump

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If you don't vac out the system, when you let the refrigerant into the system it will react with moisture that is in the gas pipes and form an acid, which over time will destroy the compressor. Putting a vacuum on the system also proves that you don't have any leak in the system.

Posted on Apr 24, 2010

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  • power_enterp Apr 27, 2010

    No worries. Have fun

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By the book no, However production is another thing, reality is, very few new homes are ever evacuated, if at all they are purged with refrigerant a bit, If me I would do it, if unable , purge a bit.

Posted on Apr 24, 2010

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How do I replace a outside central air conditioner


First you need to determine if it is a heat pump or straight cool condenser. The reason is the low voltage wiring is different. This is the correct way to install an outside unit.
1.Pad must be level and unit should be secured to withstand 140 mile uplift wind with tie down straps.
2. Make sure breaker size does not exceed max per data sticker on unit. The electrical whip should also be correct wiring size for breaker AMPS.
3. Remove the shard er core valve to prevent damage to it, protect king valve with wet cloth or thermal trap paste to avoid damage. Connect the liquid line small cooper pipe to unit by brazing. Then run through gauges Nitrogen at low psi to prevent shoot build up in line set, now start brazing the suction line large cooper pipe, once finished help cool with water cloth.Check visually for any missed spots and re braze. Once you are comfortable that braze is a good seal now it it pressure test time.
4. (The above procedure is assuming that the inside unit has already been installed correctly, including the line set to unit.)
Through gauges connect Nitrogen compressed gas tank and increase psi in the line set to 350 psi and let stand ten minutes. If pressure is still 350 on both gauges you have a good seal, release the nitrogen into the air and remove tank from hose. Once gauges read 0 psi on both sides high and low you can start the vacuum process. These pressures can differ per refrigerant ( R410A example).
5. Hook up the Vacuum pump to the middle hose from gauges making sure you have replaced the shard er core valve back into the ports.tighten all hoses to any connection on machine, gauges, and pump open gauges and turn on pump allow to run at lest 20 minutes or until you reach 100 microns in a vacuum.Shut, close gauges and shut off pump remove the hose from pump.connect this hose to refrigerant tank and purge to center hose at gauges ( minus) amount of purge.
6. Now you can open the king valve and let refrigerant flow out of the condenser into the line set and air handler otherwise you have to add the refrigerant, newer refrigerant has to be charged into unit in the liquid state not gas state. R410A older refrigerant can be charged in gas state R22.
7. Hook up electrical,breaker off check with volt meter, follow diagram on unit. Then hook up low voltage, for straight cool depends on t-stat and unit witch colors they use follow schematics. I have found that Goodman use blue as common and yellow for cool, make sure that the same colors are used in the air handler to provide the 24 volts to outside contact coil.
If this seams difficult, well it is unless you have the correct training incorrectly done can cause damage to unit and to personal health ..
8. Or call a professional HVAC tech.

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Sep 20, 2014 | Goodman Heating & Cooling

1 Answer

Air conditional water drip


That happened to us. It was a broken pump, pump was up in attic. attached to our inside air-con unit. We had it fitted on an inside wall of the house, and so a pump must be installed to take away the condensed water to the outside of the house. Hindsight being 20/20 I would never buy one that needed a pump to get the condensed water out of the house. We would have put it an outside wall where the water goes straight outside, no pump needed. Our First pump lasted just over 2 years so warranty was expired. Cost us over NZ$500 to have new pump installed. Never again. Only attach your unit to an outside wall, even it looks prettier on the wall where it would need a pump. Bottom line:- Don't touch a pump. Pump was cheap but labor cost for serviceman astronomical! Bet of luck.

Apr 20, 2014 | Sanyo Split System Air Conditioner

1 Answer

Heat pump problems


Some heat pumps have high and low pressure swiches installed to keep compressor from running when unsafe conditions occur that can damage the compressor. If the outside fan is not turing on, the unit is cycling on high pressure, if you see ice forming on the big refrigerant line coming from the air handler, then the compressor is shutting down on low pressure. Low pressure can be cause by lack of air flow through air handler or from a low refrigerant charge.

Feb 13, 2014 | Intertherm Heating & Cooling

1 Answer

The air conditioning fan outside the house is showing frost on the coils, what is the problem


Are you using your Air conditioner as a Heat Pump (Making heat in the house)- or as an Air Conditioner (making COLD air in the house.)

If as a heat pump, then remember-- that the WARM coil is now inside the house-- and the COLD one is outside-- So, if it is COLD outside, there is not enough HEAT out there, to keep the coil from going below freezing-- The unit may have to be turned off, and allowed to defrost, if you want more heat from the Heat Pump-

Let me know if this helped

Mack B

Jan 15, 2011 | Ruud Heating & Cooling

1 Answer

I have a danby portable air conditioner with no manual. The picture shows two ducts going outside. My question is why does the intake go outside?


On a portable a/c unit the cooling is done by taking heat out of the air inside and dispensing it outside.

That's accomplished by washing air over the heat coil in the unit, then the air goes back outside to let the heat out there.

You'll need inlet air, and outlet air to accomplish that.

Inlet air is cooler as it comes in, then that air absorbs some of the heat inside the space you're cooling and turns around to go back out leaching heat outside.

Most likely scenario.

There may be another need for outside air revolving around positive pressure inside the conditioned space.

Let me know if that doesn't solve your situ.
Russini

Oct 30, 2010 | Danby Heating & Cooling

1 Answer

Iinstall a new 2.5 ton condenser unit, cooling coil and a 90,000 btu furnace in my condo. I have charged the system with R410 Refrigerant. The unit is not getting as cold as I suspected. Is there...


first, obtaining the correct charge is rather tricky .. it depends on inside and outside temperatures and humidity .. you need gages to measure both high side and low side pressures accurately and match those figures up to a chart that considers inside/outside temp and humidity ... in a new install you can calculate the required charge based on numbers given by the manufacturer modified by the length of connecting pipe set ... before charging, the system had to be vacuum pumped for an hour or more (unless the system came precharged) .. all vents in the house should remain open for air conditioning and the furnace blower speed chosen for a specific temperature drop across the cooling coil .. some AC repair people dont know how to do all that properly .. it takes a true professional to optimize the system .. if you can find someone that really knows how to do this then you might try to bargain for a good price for him to just trim you system ..

Aug 15, 2010 | Whirlwind FH-778 Air Conditioner

1 Answer

WATER LEAKING


Water should come out of the back of a wind unit when it is humid out, usually a drain hole. If water is leaking inside from a window unit, check that the outside drail hole is not clogged or maybe it is not tilted downward enough outside (Usually a very slight tilt down toward the outside to help the water drasin out the back outside). Also, if you have excess water forming, you may need to clean the coil. For central air units water should be drippng outside the home via a pipe or tubing and if the drain tube or pipe is clogged with scum that forms inside the pipe water will back up and overflow in the house near the heater/air conditioning unit. Also, some units have a pump to pump the water out and it may not be working.

Aug 07, 2010 | Heating & Cooling

2 Answers

Is it ok to replace outside unit of central air and heat and not the inside air handler ? The upstairs A/C( over 10 yrs old) is not keeping up with South Texas heat. The temp upstairs climbs to 84-86...


I'm assuming you have had a competent Air Conditioning contractor look your unit over.if you trust your A/C contractor, why don't you work with them towards an answer? I would get an air flow and sizing analysis, a full equipment service/performance check, and see if there is something simple causing this dilemma. Possibly low refrigerant charge,or you have a filter or coil restriction on the indoor unit. I've seen mold plug a coil solidly before. And due to new federal regulations on air conditioning efficiency and the phase-out of R-22, I would recommend that any replacement equipment be done in full, not part and parcel. The newer two stage energy star rated cooling and/or heat pump offerings are a fantastic solution for premium indoor comfort, and the government is offering powerful incentives right now if you're in the market.

Aug 18, 2009 | Heating & Cooling

1 Answer

Carrier Air Conditioner, cool air then runs luke warm air


Have you checked the freon level in this unit? If you are low or there is a leak it could be the problem. Hope this helps.

Jul 19, 2008 | Carrier 36KCARMS Air Conditioner

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