Gas and Oil Home Heating Furnaces - heating and ac

i have a split system with the air cirulator inside and the heat pump outside..... when i run the ac it leaks inside the pan under the unit and overflows onto the floor.... it is a Bryant system model number FB4ANF030 the drain line comes out of the unit and straight to the drain line.... should it have a trap in it? reason im asking is that teh ones at work have a trap in the line...... and mine doenst... I would apprecaite any help...... the system is on the 2nd floor and theres another unit underneath me and i want to prevent damage to it

Air Conditioning Evaporators will always put out water. A properly installed unit will allow that water to drain either to a sanitary drain or to some point outside the building. The first thing I would do is check for drain line obstructions. Check inside the unit and inside the drain line for a build up of sludge. Drain lines have a tendancy to clog just like sink drains. I've seen units with traps and I've seen units without traps. The trap helps keep the drain line smells from being distributed by the air conditioner. I will say this, if your drain line goes to a sanitary drain you should have a trap. You don't want to chance getting sewer gas pumped into your house by your air conditioner. I'm assuming that the pan that your referring to is the drain pan outside of the airhandling unit. If this is so, this is telling me that your evaporator drain is clogged. The drain pan out side the unit is a secondary drain and it should have it's own drain line. There is a float switch that can be installed into this pan. The purpose of this switch is to turn off the unit in the event that the pan's secondary drain line becomes clogged.

Most bryant/carrier equipment is negitive psi type drain and should have a P trap installed. They will drain without one, but not very well, then will flush when unit shuts down and psi equalizes. Install P trap, clean drain line and evaporator drain pan. Remember, water flows downhill.

If it is something is wrong.If the unit has been running for a couple years with no problem you need to check drain fittings and lines.PDF