The primary purpose of the P-trap in a plumbing system is to form an isolation seal between that system and the sanitary sewer, thereby preventing sewer gases and other contaminants from entering the building. The drain seal on the condensate drain line of a draw-through hvac system has an entirely different purpose..
In this manner, does an AC unit need AP Trap?
Your a/c system needs to have two drain lines. As you can see on the main drain line, there is a P-trap and the vent pipe is after the P-trap allowing for proper air and water flow. The secondary drain line needs to be pointing downward toward the drain pan, but other than that, it is properly installed.
Likewise, does a condensate drain need AP Trap? If fan is located upstream of coil, fan will pull water up drain line counter to water flowing down drain. A P-trap is needed to block air and allow condensate to drain properly. If there is a trap tell them tho clean it all the time because it'll clog and when it does they might call you. If there is no trap…
Regarding this, what is the purpose of a condensate trap?
The primary purpose of a condensate trap is to prevent air from moving in or out of the coil box or air handler during operation. Traps must be installed in a manner that will stop the air from passing through, but still allow the condensate to drain from the condensate pan. Without a trap, this doesn't happen.
Why is AP Trap needed?
A P-trap is a plumbing fixture that has several purposes. It traps debris that has drained from the sink and prevents it from forming a clog deep within the plumbing system, and to stops sewer gases from passing into the home.
Related Question Answers
Where do I run my AC condensate drain line?
Every central air conditioner has a condensate drain line that runs from the indoor air handler to the outside of the home. Look for a white PVC pipe that's located near your outdoor unit.What is an AC trap?
The same thing applies to our air conditioner, but in our case, the purpose of the P-Trap is to prevent outside air from being drawn through the A/C unit. The weight of the water in the trap is enough to prevent this, while still allowing condensation to flow freely. Another key component of a P-Trap is an air vent…How often should you pour bleach in your AC?
Using Bleach in Your AC DrainBe sure to use a minimum of 2 cups once or twice per year. Be advised, however, some newer units no longer recommend bleach or vinegar due to oxidation/degradation concerns. In these cases, boiling water is recommended.Does a condensate drain need a vent?
As long as the condensate drain is connected to the home's plumbing, a trap is needed to prevent the sewer gas from entering the space. The trap could be plumbed in such a way that a vent is unneeded, but depending on the layout it may be easier to connect a vent for that trap to a plumbing vent.Do I need a condensation trap?
Ductwork that is insulated to the required level should not require a Condensation Trap, but if it is deemed desirable to fit one as a belt and braces solution, then the trap and the condensate drain pipe will need to be insulated as well, if it is located in the cold space.Should the condensate trap be full of water?
These traps form a seal which prevents poisonous combustion gases passing out of the boiler along the condensate drain pipe. If the trap is removed for cleaning it should always be refilled with water when it is fitted, before running the boiler.Is AC condensate corrosive?
Condensate that comes off the cooling coil is from the air, and will not be particularly acidic at all.Why is my AC drip pan overflowing?
A clogged condensate drain pipe can make your AC system's drain pan overflow. This is probably the most frequent cause of water leakage from a central AC system, bringing many service calls to HVAC professionals as summer temperatures rise. Drain lines can become clogged with dirt, rust, algae and other debris.How should a condensate pipe be installed?
The condensate pipe should be run internally as far as possible before going externally and the pipe diameter should be increased to a minimum of 30mm ID (typically 32mm OD) before it passes through the wall.Why does a 90 furnace condensate?
To squeeze 90% or more of the heat energy out of a gas flame, you have to condense the water vapor out of the exhaust into liquid form and recover the heat of evaporation from it. It turns out, however, that when you condense out the water vapor, the nitrogen products — the NOX — come along with it.Why is there ap trap for condensate drain?
The primary purpose of the P-trap in a plumbing system is to form an isolation seal between that system and the sanitary sewer, thereby preventing sewer gases and other contaminants from entering the building. The drain seal on the condensate drain line of a draw-through hvac system has an entirely different purpose.Does a furnace drain need a trap?
All condensate drains go into a trap. The condensate trap is absolutely mandatory for a high-efficiency gas furnace. Since the drain taps into the exhaust system, leaving it open to the air would allow for a potential exhaust/flue gas leak in the living space, which is a big no-no.Should there be water in AC drip pan?
However, when it comes to your air conditioner's drip pan, also known as the drain pan, the presence of water is perfectly normal… but only if it's flowing out of the pan. When not taken care of promptly, a clogged drainpipe can cause serious mechanical problems for your air conditioner.Where is the condensate drain pan?
Condensate drain pans are a part of most central air conditioning systems. These pans sit below the cooling coils in the air handler portion of the system. As the warm air passes over the cooling coils, moisture accumulates on the coils and drips down into the condensate pan.What is condensate drain pipe?
Enter: the condensate line. Your condensate line is essentially a drain line. It's typically made out of plastic (commonly PVC) or sometimes metal, although plastic is preferable. It connects directly to the HVAC unit then leads outdoors, often through an exterior wall.Do I need a condensate pump on my furnace?
If you have an air conditioning system with an indoor unit, or you use a high efficiency furnace, then you definitely need to have a condensate pump to remove the vapor and other condensate that will accumulate when the system runs.How does AC drain work?
The AC condensate drain line removes the water released when the evaporator in your AC unit converts refrigerant from a liquid to a gas. (Learn more about your HVAC system here). Over time, algae and other muck can build up. This may lead ot an AC drain line clog if you don't maintain your AC unit regularly.Why is an S trap illegal?
The purpose of a trap is to prevent sewer gases, and possibly vermin, from coming in to the home. Back to “S” traps – The reason “S” traps aren't allowed is because they have the potential to suck, or 'siphon', water out of the trap as the water flows down the drain.Can two sinks share a trap?
Speaking from personal experience, only use one trap in a dual sink bathroom. With two traps, you can get air pockets blocking one or the other's drain. Normally, these double tees are used for adjoining bathrooms, so you can have a sink on each side of the wall, and share the same stack. 
Jackson Reed 
