Question
Pardon me if this has been asked before:

I have a two-stage gas Arco furnace.  Every 3-4 months I am forced to
take out the burners and clean them out.  My theory is that the gas
can’t get through the dirty burners to come in contact with the glow
element.  The furnace tieos and tries to fire up but it can’t until I
clean them aluminum burners.  Or maybe too much dust is getting into the
intake, I have those crappy permanent foam-mesh filters.  Maybe it’s
that?

Or is my gas furance burning to rich?  Can this mixture of gas and air
be adjusted to make it burn cleaner so my burners stop from getting
plugged up all the time?

Answers
I think you should keep the area around the furnace clean and get a get a
pro to look at this.

Is it a down flow furnace by any chance?

Associated Down Flow Furnace Question: i am trying to convert up flow furnace in to down flow is that poss? can just turn the blower around ?
Content::ca i turn the blower around and install it that way?…is there a kit that could help me do that?….thank you.

• Answer:blower has to be before heat exchanger so you don’t cook motor. I haven’t ever tried but if there is not enough room for duct out top 2 floor and out bottom to return duct, then i suppose you can have a blower compartment made to set down draft blower on top then set evap. coil (if applicable) in old blower section. most heaters are multi position and you can set it up horizontally. good luck.

Associated Down Flow Furnace Question:Down flow gas furnace is acting up. All burners not fully lighting regularly?
The hot surface igniter glows red, gas valve opens and ignites gas in one of three chambers. After about 10 seconds, sometimes the “flame” travels to the other two chambers like it is supposed to. Sometimes the flame does not travel to the other two chambers and the furnace recycles and tries again. The flame sensor is in the chamber farthest from the chamber with the hot surface igniter that lights up first. The furnace is in a new home that is about 3 years old. I have also noticed that I have 3 cylindrical sensors in the burner area that appear to have reset buttons on the tops of them. I am guessing these are the flame “rollout” sensors. Does this sound like dirty burners or “crossovers”? Record cold temps are on their way and would really like to get the furnace operating correclty. Please help.

• Answer:sounds like dirty. if burners have air adjustments too much air mixing with gas. switches are safety for over heat and roll out. try shifting burners around and see if jump slot on burners are open

Associated Down Flow Furnace Question:what is the difference between a down-flow furnace and a up-flow furnace?

• Answer:downflows are usually put in attic and upflows are usually in the basement.

Associated Down Flow Furnace Question: How to install an a-coil in a down flow furnace for air conditioning?
I’m installing an a-coil in a down flow furnace, do I leave it the same orientation as installing up-flow, or do I flip the coil over so the air flow funnels through it, actually making this a v-coil? Doing this would leave me with the drip pan above, but I figured the air would flow better through it. I’m just sitting the a-coil in the box under the furnace so it’s there for the tech to hook up the lines. I’m not doing the soldering, just getting everything in place to save some money.

• Answer:Couple things, Central AC is not really a DIY project. but, if you insist, air will NOT flow better through your evaporator because you inverted it. also you might end up with an oil return problem which will destroy the compressor. and as you eluded to, the condensate drip pan HAS to be on the bottom. water leaking from it will rot the floor around your furnace. so please leave it in the same orientation as upflow. Further be sure to braze or silver solder the refrigerant lines as apposed to soft soldering like you would do with copper water pipes. if your system uses r-22 it will leak at these joints. if your system uses r-410 these joints could literaly blow apart not to mention the corrosive properties of soft solder flux. I highly recomend getting a pro to do this project for you. blower speed, location of the condensing unit, proper refrigerant charge, proper evacuation especially in the case of r-410 are all factors that could make or brake you on this project.

Associated Down Flow Furnace Question: Changing a gas furnace to an electric?
Ok here is the question the A core was on the bottom of the gas furnace(down flow) and all of the electric units I have seen the A core has been on top will it be safe to install the electric furnace( down flow) over the A core?

• Answer:A-Coil? Yes it will be perfectly fine. An A coil is placed on top of a furnace when it is an upflow, also the electric furnaces you have seen with the coil on top of a downflow furnace are called air handlers,they pull air across the coil through the return instead of blowing airacrosss the coil.

Associated Down Flow Furnace Question:Is there a big difference between a 125,000 BTU gas furnace and a 100,000 BTU??Please let me know. Thank You!?
I’m installing a down flow furnace and I don’t know which one is more convenient, if the 125,000BTU or the 100,000BTU. There’s a difference in price (about $125.00) but I’ll like to know which one is more convenient in the long run.Thank You for your reply….

• Answer: This Question has not been answered yet! Send us Your best down flow furnace Answer!

Associated Down Flow Furnace Question: Where do the wires go to slow down the motor on a furnace?
My furnace in the garage is very noisey because of the air flow. Sounds like a jet engine. Did some research and found out since i don,t use it for AC i can slow down the motor and reduce the noise. Have the owners manual but am not sure what wires are moved and to where on the IC board. It is a Thermal zone Model 120K 200S. Only about 4 years old. Can anyone help? Thank you Stan

• Answer:To adjust the blower speed trace the wires from the blower motor to the IC board. Normally the speed is set by plugging the red, black, or blue wire onto the board’s terminal strip. The remaining wires are put on “park” terminals that do not connect to circuits in the board. Turn the power to the furnace off before you start switching, of course. I can tell you that you are still going to have plenty of noise, especially if there is no return-air ductwork to help muffle the sound. It doesn’t help, of course, that the equipment is in the same area as yourself. Try locating the blower wires on the electric diagram. Sometimes this helps. Good luck.

Associated Down Flow Furnace Question:How can you quiet down a noisy furnace return.?
I have a small old house and the basement is really small so the return in the house is right by the furnace. It gets really noisy and no i can not move it because it already as a large hole in my hardwood floors. I read some where that you can add two 6 inch ducts to form a C shape to quiet the air flow would that work?

• Answer:About the best thing to do is see if you can add a 3 inch thick filter to that opening. This is done in large openings that are right above the furnace and the blower noise is reduced to zero by this method. You can go to Lowes and view just what they have available in the 3 inch thick filters.

Associated Down Flow Furnace Question:Gas furnace overheating?
I have a Tappan, older model down flow furnace. There is no A-coil. It fires up nicely and after about 10 minutes burners will cycle off cause it gets too hot. The air coming out of the vents is very hot and the vent itself is untouchable! Very hot! The burners will stay off for about 2 minutes or so then kick back on for a few, then off, then on, over and over cause it keeps getting too hot. Now, I have plenty of good intake air flow and the filter is brand new. The fan blades are free of dust. Plenty of air is coming out the vents so my ducts are not restricted. I suspect the motor may not be turning fast enough. Can a motor get slow in its old age? It acts a bit sluggish. I don’t know what else it could be. Help please. Oh, and the belt was really loose but I tightened it. Maybe it is not tight enough still cause by hand I can make the belt slip.

• Answer:- gas pressure from the manifold may be too high – may be a crack in the heat exchanger, causing the furnace to overheat and the excess air mixing in with the combustion causes the flue vent to be hotter as well. when the blower kicks on check the flame to see if it begins to waver.

Associated Down Flow Furnace Question: What is needed to switch over furnace?
I have a Lennox E16Q3-15-1P electric furnace/ heat pump that I would like to install in a mobile home to replace the gas furnace. It says UP FLOW OR DOWN FLOW ONLY which I am assuming it means it can be used for either, it is currently set up for UP FLOW, how do I go about changing it to DOWN FLOW?

• Answer:Usually that means you need some sort of coil drain pan conversion kit. Sometimes the coil can just be flipped without a downflow kit, but usually you need one. Also, if you’re switching from a gas furnace to an electric furnace, you are also going to have to make sure you change the circuit from 115v to 240v and make sure the wire size is big enough for the Kilowatt rating of your electric heaters.

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