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In our company there is ductatble AC unit having capacity of 10 Ton which catert the AC requirement of two office rooms. This AC unit is installed in passage above false sealing and duct is extened to both offices. Since installing these AC unit is having problme of sweating on false sealing area below the unit and near by area. Drain line of the condensate is checked and it is in dechoked condition. Supply line of unit is already insulated and return from the room is from open passage. What are the caused of sweating ? and what remediy is to be done.

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Hi, this is a 10 ton a/c unit, more then likely has 2 stages of cooling. You say the copper suction line is wrapped with insulation already, and the problems continue? What you need to do next as the evaporator coils are in the ceiling, is to have a condensation pan made to cover the bottom of the unit to catch any moisture that drips from the suction line and evaporator coils and have a 3/4" drain that will drain into existing condensate line. You can't prevent the suction line from sweating has thee cold temperatures are reaching its dew point and will always drip. The line should be wrapped with a black cork type insulation that has a sticky back that is made for this suction line. All you can do is have a sheet metal pan made to put under this unit to catch the moisture and let it drain or evaporate if its not real bad. I have seen this many times with units that are in the ceiling, which will destroy the tiles. Keep in mind that the suction line will reach temperatures of 40*F and will drip condensation when it is cooling so they should have put a pan under this unit when it was installed. This will solve the problem, and that's about all that you can do. Please don't forget to rate me as I know you will be kind. I wish I had other ways to solve this, but this is the only way, and the way it should have been done to begin with.
Sincerely, Shastalaker7
A/C, Heating, & Refrigeration Contractor

Posted on Sep 04, 2010

Testimonial: "Dear Sir, Thanks for prompt reply. Solution will be useful to us. The drain collection pan is already provided and insu. already supply duct."

  • Robert Horton
    Robert Horton Sep 04, 2010

    Thank you for the great rating, so, you do have a pan and the suction line is probably not over this pan to catch the moisture. Try picking up a roll of this cork tape to go back over the lines. I wish that I was there as I would have a better picture of what and where the water is coming from to help you more.Make sure the drain line stays open by using a portable air tank you can pick up at any auto parts store with a nozzle and you can blow through it.If the copper suction line is the main problem, all that can be done is have a tech come out to pump down the unit and relocate this line in a way that it will not condense over the tiles. This is a bad situation I know, and can be difficult to solve, but they should have taken all of this into consideration when they installed it. I wish you the best on this. Thank you for using me here at FixYa.com.
    Shastalaker7

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Hello sir,I wan a AC for the 150 sft office.how much tone AC required for this much big room and wat wil be the cost of it.


the tonnage is found by taking the wattage of all equiment in the room to include the lighting utilising a formula to equate to btus. take this run a t-24 calc figuring all the factors window r factor, insullation, shading roof compasition, room facing direction etc. what system are you wishing a ductless split? motel unit? bard? split? heat pump? room unit? also electrical needs to be ran. figure a $1000 per ton contractor installed plus the electrical $500-750.

Mar 03, 2011 | Heating & Cooling

1 Answer

I am looking to buy a mini split ac/heating 1 ton unit. I want to know how high from the floor does the unit have to be to cool and heat a 10 x 20 room?


Hi, when you buy your split system, the indoor unit will mount on your wall off off the floor a distance that the factory has made it for. With an 8' to 10' ceiling, it would be about 7' off the floor. This all depends on the refrigeration plumbing coming from the outdoor condenser to the indoor unit. It will tell you all of this on the installation kit for this unit, as the plumbing for the freon pipes are already pre-made for a certain height. A 1 ton, (12,000 btu) unit will have no trouble cooling a room of this size, so check with the manufacture on the height it will be.
Shastalaker7
A/C, & Heating Contractor

Jan 04, 2011 | Goodman Heating & Cooling

2 Answers

I have a Goodman GSC130361DE it is too small for a 2100sq ft home


Well you have a 3 ton system, it might be a tick small depending on windows and insulation in the house. Make sure you set it at one temp and leave it. Zoneing would also help.

Jul 17, 2010 | Goodman CLQ30AR32 Air Conditioner

1 Answer

Can I mix brands/tons when installing AC unit to existing coils?


First off - the 'rule of thumb' is 600' per ton of Air Conditioning. In other words your old unit is a 2 ton unit. So - 2 tons x 600' = 1200'. As you can see if you install the 2.5 ton unit - you will be installing a AC that 'could' cool a 1500 sq ft house (2.5 x 600' =1500 sq ft.). Slightly more than what you need; and the 3.5 ton unit is 'way to big,' (3.5 x 600' = 2100 sq ft.).

Note: fyi - many in the AC business will sometimes refer to tonnage in btu's, i.e. 1 ton = 12000 btu - hence a '2 ton unit' can also be referred to as a 24000 btu unit and vice versa.

So... from the above - you can easily see that "2 tons" of Air conditioning is what is required to cool the 'average' home of 1100 sq ft. "roughly speaking."

Note: it is always best to have a professional 'size' your cooling/heating needs.

One of your questions was could you 'mix tonnage?'

The answer is 'usually you don't mix the tonnage of your outside/inside units.' However, professionals sometimes do (mix the tonnage) in certain situations, and installing a 2.5 ton outside unit with an existing 2 ton inside unit is often done, however, there are some 'tech issues' here and - I would "again" recommend that you call a Service Tech to help you with the sizing/mixing of your cooling/heating needs.

hope this has helped

Jun 20, 2010 | Carrier 38CKC036 Air Conditioner

1 Answer

Anybody there?


It depends on the room varables, If it has an attic, tile ceiling, what type of walls, where in the building is the room and so on? The biggest problems is all ways the power. Get a free estaimate from an A/C company. Everyone and myself needs to see the room before they give you an recomndation that can truly be applyed to your situation. But to give you some ideas, I would put a 2.5 ton - 3 ton unit just for over kill. Go with a straight cool package unit. If your company tight on cash just get a mini split system with a 30,000 BTU to 36,000 BTU cooling capacity. Cost for something thats going to last 20 years, avg. is $4,500- for the package unit and as low as $3,000 for the mini split.

Oct 17, 2009 | Frigidaire FAA055N7A 5200 BTU Room Air...

2 Answers

Voltage Stabilizer for LG 1.5 ton window type ac


You should have around 120-125 volts at the outlet. If you have less than 110 volts at that one outlet, you may need to have your house wiring checked. Go ahead and call your local power company and have the power coming into your house checked at their transformer. They should do this at no charge to you.

Aug 02, 2009 | Heating & Cooling

2 Answers

Is the Model #25HBA360A300 a 5 ton unit?


36k-car-ms Key Features AC Type: Split System Additional Features: Ductless Cooling Capacity: 36000 BTU/hr Electrical Requirements Voltage: 220It is a 3 ton aprox 550 sq feet per ton is required

May 01, 2009 | Carrier 36KCARMS Air Conditioner

1 Answer

In Dec 07 I had a complete Carrier AC/Gas Heating System installed in my home to replace my original system when my house was built in 1983.We upgraded the new system to 3-TON AC as the old AC was 2 and...


Air conditioning requires 400 cfm (cubic feet per minute) per ton of cooling so your old 2.5 ton system would have required 1000 cfm and your new 3 ton requires 1200 cfm. This is not a big change, but if your ductwork is too small it could cause problems. The best way to check to see if airflow is the problem is to check the temperature of the air going in to the system and then check it when it comes out. Take a temp reading with a reliable digital thermometer at the return grill ( the vent that is physically the closest to the furnace that is sucking air in). Then take a temperature reading at the vent that is physically closest to the furnace and that is blowing air out. The target range is for the air coming out to be 18-22 deg F colder that the air going in. If the air is coming out is more than 22 deg colder then there is not enough air moving through the system. If the air is coming out is less than 18 deg colder then the problem is with the system. Potential problems range from improper refrigerant charge or incorrect refrigerant metering to wrong coil/volume ratio which is essentially mis-matched equipment. It sounds to me like you have a company that doesn't really have much of a clue what they are doing. When the company I work for changes equipment in a house to a larger capacity, we always check the ductwork and do the math ahead of time to make sure that things will work rather that throwing things at problems later. Also, when you check your temps turn the system on and allow it to run for about 10-15 min first so that everything has a chance to stabilize and the ductwork has a chance to cool down.

Jun 30, 2008 | Carrier Heating & Cooling

1 Answer

Why the word ton used for airconditioner.


hi there..

this what i found for you...

The unit ton is used in refrigeration and air conditioning to measure heat absorption. Prior to the introduction of mechanical refrigeration, cooling was accomplished by delivering ice. Installing one ton of refrigeration replaced the daily delivery of one ton of ice.
  • In the United States, a standard ton of refrigeration = 12,000 BTU/h = 200 BTU/min ≈ 3,517 W. It is approximately the power required to cool 1 short ton of water by 1 °F every 10 minutes; or the power required to melt one short ton (2,000 lb) of ice at 0 °C in 24 hours.
  • A ton is also a unit of energy equal to that power for a period of a day, or 24 h × 12,000 BTU/h = 288,000 BTU ≈ 303.9 megajoules.
  • A less common usage is the power required to cool 1 long ton of water by 1 °F every 10 minutes = 13,440 BTU/h ≈ 3,939 W.
All the Best.

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Feb 24, 2008 | Heating & Cooling

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