Question
Which furnace is a better brand?  What problems if any would I expect from
either furnace.

I live in West Virginia so I will probably be using it 7 or 8 months out of
the year.

Any input would be greatly appreciated.  Thanks.

Answers
Purchase what is prevalent in your area.. You know!!
One that has instant service …parts on hand…24 hour
everyday emergency service… Will do an A-1 installation.
Will be in business tommorrow and next year and the year
after. Williamson and Armstrong are inexpensive units…
but there isn’t a dealer/service on every corner…Check
your area out for dealers..

Associated Williamson Oil Furnace Question: bought an williamson oil furnace,m#wlbo-10ar.need to find the wire diagram to put the power to the unit.?

• Answer:http://en.allexperts.com/q/Heating-Air-Conditioning-696/Williamson-Oil-Saver-Furnace.htm

Associated Williamson Oil Furnace Question: my williamson oil furnace is only blowing out cool air whats my problem?

• Answer:The burner is probably locked out for some reason. Should be a reset button on the burner. If it runs after resetting but locks out again there is some problem, do not keep resetting because fuel may accumulate in the chamber if there is an ignition problem. Call a tech for service. Its blowing cold air because your blower is probably operated by a timed control that starts when the heating cycle is suppose to start.

Associated Williamson Oil Furnace Question: Looking for the filter on a Williamson Therm flow oil furnace?

• Answer:some are in the door some are in a slide in box on the side , do you have an up flow or a down flow furnace / some are on top

Associated Williamson Oil Furnace Question: fan keeps blowing on house furnace?
have a williamson temp-o-matic oil burning furnace. recently ran it out of fuel oil and had to bleed the line, got the furnace going but now the fan runs constantly and shortly after the heating cycle stops it blows cold air into the house since it is in the basement. shut the power off to furnace in hopes of it resetting itself, didnt work my other option is to shut fan off completely.

• Answer:It sounds like the thermostat fan switch is set to ON instead of AUTO. If not then hopefully you have a wiring diagram and can trace the point that is supposed to be open to kill the fan and then can determine the failure.

Associated Williamson Oil Furnace Question: Loss of hot water! Please help!!?
I have a williamson fuel oil furnace that also heats my hot water. A couple of weeks ago it quit. I had a tech come out and look at it. The nozzle was plugged and the electrodes were a little wore. He replaced the nozzle and re-gapped the electrodes. He also replaced the in line fuel oil filter. He made some adjustments to get me from 66% efficiency to 82%. The aqua stat was set at 180 lo & 180 hi with a diff. of 10. He changed it to 170 lo & 190 hi keeping the diff. at 10. The furnace heats the house good but doesn’t heat the hot water good anymore. You only have about 3 mins. of hot water for the shower and then it gets luke warm for about 2 mins and then gets cold and doesn’t ever get any warmer than luke warm again (no other appliances were running). When the shower was cold I ran hot water at the kitchen sink for a few minutes and it was also cold. It doesn’t matter what temp you set the aqua stat to the same thing happens every time. The furnace will kick on at 160 and kick off at 165 when it’s heating the water (current settings 170 lo 190 hi diff. 10). Is there a problem with the aqua stat? Or is it something else? I had a problem with low water pressure a couple of years ago. We had a tech come out and do an acid flush for our system. It worked very well. He said that we had a high concentration of calcium in our water and we should have our system flushed every couple of years. The water pressure is ok now. Is it possible the heating performance of the coils in the furnace is somehow hindered by the calcium in the water? Can anyone help me?

• Answer:Get the hot water coil flushed again. If you have hard water or allot of mineral in the water, this will attach itself to the inside of the hot water coil, insulating it for heat transfer. normal settings for a hot water furnace are 160 low, 180 high and the diff set at 10.

Question
Does anyone have any references for actual numbers for this argument,
i.e. how many calories expended at different ‘Zones’..rough estimates
would be fine? My intuition would tell me that if an active athlete
was
interested in losing weight, then they are going to have low glycogen
stores. Therefore if they want to lose weight and they exercise at a
higher level, then they are going to need supplemental carbs. However,
if they exercise in the ‘FAt Burning Zone’ then they don’t need
carbohydrate during exercise, and yes, while they will burn fewer
calories during their bout of exercise…then they are more likely to
lose weight.

Answers
W/o going into a lot of detail, let me just say that the author of the
article you quote has it exactly right: total energy expenditure
increases linearly with increasing exercise intensity (power output),
whereas the percentage of energy from fat tends to fall slightly at
first and then more precipitously at higher levels
(approaching/exceeding ‘threshold’). The *absolute* rate of fat
oxidation is the product of these two, and thus is generally maximal at
a higher exercise intensity than what most people consider “the fat
burning zone”. So, the first mistake that is commonly made is limiting
the exercise intensity to maximize the *percentage* of calories
coming from fat, when in fact that absolute rate of fat oxidation is
greater at a higher intensity. Of course, what really matters is not the
rate of fat oxidation, but the overall rate of energy expenditure: as
you would expect from simple energy balance considerations/the laws of
thermodynamics, and as borne out by research, changes in body
composition with exercise training are related to the total energy
expenditure, not the relative or absolute rates of fat oxidation.

There are, of course, other considerations when it comes to exercise
prescription, esp. for a competitive endurance athlete vs someone who is
simply trying to maintain a healthy body weight. But the idea that there
is some magic ‘fat burning zone’ that is ideal even for achieving the
latter goal is a complete and utter myth.

Associated What Is The Fat Burning Furnace Program Question: what are some of the intense resistance techniques from the Fat Burning Furnace program?
I really need to know these! it won’t let me buy the actual program and I want to know how to work out properly help!

• Answer:Try the Lil jack workout http://www.youtube.com/watch?v=TKCGe2Ezris it really works

Associated What Is The Fat Burning Furnace Program Question:How does the Fat Burning Furnace program work?
I have been battling obesity for 10 years now. I do not eat much at all. And I am now beginning to have health issues arise. I have 2 beautiful children that I need to be able to play with. I have tried everything and none of it really works. I seriously NEED to lose 98 pounds. I have been seeing a doctor for 6 months about this issue. When I started, I was 113 pounds overweight. I have lost only 15 pounds in 6 months. Now they are talking about surgical procedures. I do not want to do this if I don’t have to. When I found the Fat Burning Furnace page online, I wanted to check it out. Can anyone help me? Does it work? What do you do? PLEASE HELP!!!!

• Answer:I used it and it work wonders for me.

Associated What Is The Fat Burning Furnace Program Question: Has anyone heard of the Fat Burning Furnace weight loss program?Does it really work? Is it worth the $40.00 and or what is the so called “trick”. Thanks

• Answer:You can find some answers in a web search for “fat burning furnace diet reviews”.

Associated What Is The Fat Burning Furnace Program Question:What’s up with the Fat Burning Furnace?
I’m not old enough to go out and by all these books and whatever, nor will my mother let me. What exercises are used in the program? What about the diet part? I’m WAY too overweight (honestly, about sixty pounds) and I’m hoping this plan really is different. What do they do in it?

• Answer:The core idea behind Fat Burning Furnace is doing High Intensity Interval Training (HIIT). This isn’t a new idea, but FBF takes it to a whole new level and helps get you the most results for the minimum amount of time. The basic idea behind HIIT is to push your body to it’s limit with just a few intense reps. This breaks down your muscles, and as they rebuild themselves, they burn away a lot of calories and eat up all your fat deposits. It’s really quite effective. FBF gives you few different HIIT workouts that you can use based on your fitness level and whether or not you have access to a gym, so it’s not a one-size-fits-all workout program. There’s also some information on diet, which is pretty useful, but isn’t quite as spot-on as the HIIT exercises.

Associated What Is The Fat Burning Furnace Program Question:What are exercises that boost your metabolism?
I’m 16 years old, and looking to lose some weight. I’ve read about the exercise/diet plan for Fat Burning Furnace, but my parents won’t buy me the product/book and I don’t have a credit card to buy it myself. I’m wondering if anyone that’s using the program could forward me some of the exercise routines Rob Polous includes in the book? Thanks!

• Answer:I can’t forward you the book, but I’ll tell you that the exercises are what they call “High Intensity Interval Training” (HIIT) exercises. These aren’t a new idea or anything, so you can look up a few HIIT workouts if you can’t afford the book. The book streamlines the whole process and makes it so that you can minimize your time in the gym or working out. But you can just as easily make your own workouts on your own.. These exercises will basically break down your muscles and as they rebuild themselves, they will consume calories and tap into your fat reserves (causing you to lose weight). Don’t worry about becoming some kind of freakish body builder with huge muscles though; you really can’t do that to yourself unless you really try to. I think the diet portion of the Fat Burning Furnace book is good, but it’s not really my thing. It can basically be described as “eating healthy” and portion control. I’m sure it would work, but I’ve never really liked watching what I eat that much. LOL! Hope this helps.

Question
Before I blow up the house…

This past summer, I scheduled an “annual” inspection by the gas company
(in quotes because it has been several years). The inspector found a
problem with the flue pipes and tagged the furnace.

I had the repair work done and called the gas company to send the
inspector back out. He came out, inspected, and removed the tag.
However, I discovered this evening, as the house finally got cold enough
for me to notice, that he neglected to turn the gas back on. I mean
there’s the gas pipe, and it’s got a valve on it, and the valve handle
is at 90 degrees to the line. So that pretty much tells me the gas to
the furnace is not turned on.

Okay, so here’s the stupid user question. Do gas furnaces still have
pilot lights that require lighting when the gas is turned on, or do they
have electric ignition and just need the valve opened to start working?

I should add that this is a Bryant Quietline furnace of unknown vintage
but at least a decade old, probably more like two decades, if that makes
a difference in answering the question.

If nobody here knows the answer, I’ll call the gas company tomorrow and
use extra blankets tonight. I don’t want to call them now and then have
to wait up all night for them to show up and tell me what an idiot I am.
Answers
Ok, a couple of things. First of all, you mentioned you couldn’t hear because of
the fan. Is your thermostat set to have the fan on ON, and not AUTO? If it isn’t
there already, set it to auto (mainly so it keeps quiet to aid troubleshooting).
I ask this because typically the blower fan doesn’t start until the plenum gets
hot or a set time after burner ignition. Or do you mean you hear the draft
inducer blower running? That’s a much smaller fan that blows the exhaust out of
the furnace, and yes that one should come on immediately after the call for heat.
Not all furnaces have an inducer fan, older ones would be less likely to have
this.

You mentioned (I think) there are two furnaces, side by side. For now, just pick
one and concentrate on that. Do both furnaces have a separate manual shut off on
the gas line?

If it has a pilot, the control knob I referred to would be on a valve unit inside
the furance. Just follow the gas line inside the furnace until you get to
something that looks like a valve. If it is electronic ignition, it will not have
a knob, if it is a pilot ignition, it will..

I assume your furnace is single stage. (i.e. it’s either on or off, no low or
high). I’m also assuming it is not a high efficiency furnace and the exhaust flue
is connected to a chimney.
If the furnace is electronic ignition, the sequence of events is controlled by a
circuit board and goes like this:
1.) Thermostat calls for heat (closes a 24 volt control circuit)
2.) Draft inducer fan (if equipped) starts and positive draft verified.
3.) Ignitor is energized, which gets extremely hot. (takes 10-30 seconds usually)

4.) When ignitor passes ready test, main gas valve opens, supplying the burner.
The hot ignitor ignites the gas.
5.) Positive burner ignition is detected and gas valve is permitted to remain
open. If not, a fault is detected (possibly recorded) and main valve is shut off.

6.) After a minute or two, furnace is hot enough to run the main blower, which
starts on its own thermostat or via a timer.

If it is pilot, it is much simpler.
1.) Thermostat calls for heat
2) Draft inducer fan starts (if equipped)
3.) Gas valve to burner opens. The burner lights immediately from the pilot.
4.) Blower fan turns on as above.

Do you know the model number of the furnace? Perhaps I can find better
information based on that.
Associated Furnace Gas Valve Question:how does a furnace gas valve work elactrical and trouble shooting it th tr where does – &+ for 24v?
my furnace has 4 burners two burners turn on but very lazy flame the other two do not and the furnace turns off i just need to know how to trouble shoot it check for pressure or tell me what the symbols mean it has TH TR and TH/TR terminal with screws i found a web site on the valves and seen how they work and i have a bad solenoid need to buy valve not opening all the way ignorance and not knowing is your worst enemy.

• Answer:You may need to have the burners cleaned. There’s nothing wrong with the gas valve if you’re getting any kind of flame. the cleaning should be done by someone who knows what they’re doing, a.k.a. a professional.

Associated Furnace Gas Valve Question:how do you manually open a furnace gas valve?
installing new 2 stage furnace, need to set hi lh propane pressures, how do i manually actuate each each seperately?

• Answer:I Agree with get pro help, but if you know which terminals operate which stage you can take a jumper (a wire with an alligator clip on each end ) and introduce 12 volts to the positive terminal on the valve, by clipping the one end to the R terminal where your thermostat wire comes in, and the other to the valve. That will make it open but make sure your ignition system is on other wise you will be letting raw gas into the chamber. if this is sounding to complicated for you DON”T DO IT call some one who can help

Associated Furnace Gas Valve Question:how to install a furnace gas valve?
I am wondering if there is anything tricky about ,just turning off the gas and changing it?

• Answer:nothing tricky,shut off gas,shut off elec,break union,remove pipe inst valve using good pipe dope or teflon tape making sure the tape does not extend beyond the end of the pipe,make sure the arrow on the gas valve goes with the flo of gas,after inst valve turn on gas ,get spray bottle w/soapy h20 in it and spray fittings looking for bubbles,reconnect wires,turn on gas valve and test

Associated Furnace Gas Valve Question:I have a Carrier furnace. The gas valve works intermittently?
A 5 year old Carrier furnace, with HSI: The gas valve has worked intermittently for the last year. I would come out to the garage, cycle power to the furnace, and the unit would then work (sometimes) I’ve done the following: 1. I tested the connection from the PCB to the valve, both green two wire connection and the blue. No change. 2. The large solenoid clicks when the relay turns the valve on, but the small relay doesn’t seem to be working. 3. It tries three or four times, then locks out for three hours. 4. I’ve checked the PCB and no obvious heat or burn marks on the board. 5. I’ve made sure I have a good ground (I ran a jumper to a nearby water line to make sure) 6. The fuse on the PCB is fine. 7. The cycle is normal, (power-up, wait a few secs, the main blower blows for 2 min, the purge motor comes on for 10-15 sec, I hear the hsi relay , the hsi glows, the gas valve relay and the large solenoid clicks. Any option but to replace the gas valve?

• Answer:tighten all wire connections, check for any oxidizing on wires or terminals(boards). on valves put a screwdriver on top to make sure valve is working, try to pull screwdriver up off top it should have magnetism feel to it. if these are ok you will need to replace valve.

Associated Furnace Gas Valve Question:where can I find a knob for a gas valve for a furnace?
The name of the furnace is called Intertherm, the model # is 315984 and the gas valve is # 36c67. There is nothing wrong with the valve, do I have to replace the whole part?

• Answer:Just get a universal knob at the hardware store that has vice clamp in it, even a faucet knob.

Associated Furnace Gas Valve Question:I have a gas furnace, the pilot is not staying lit, and the gas valve won’t turn on..help?
It is a gas floor furnace. I have little the pilot numerous amounts of times, and it keeps staying on and then it goes out. The gas valve won’t turn on. Let me revise my question, the pilot light IS staying lit, but the when you go to turn it to the on position it goes out

• Answer:If the pilot light won’t stay lit, it may be the thermocouple. That is the metal tube that the pilot light keeps hot. It generates a small electrical charge that goes up the wire to the valve. They thermocouple usually will screw in to the valve and clip on to the pilot light. You can get a new one at most hardware stores, Home Deopt, Lowes, Coast To Coast, Ace Hardware, etc. If you’re a renter, the landlord should probably replace it.

Associated Furnace Gas Valve Question:natural gas furnace valve not opening?
I recently converted my furnace from l.p. gas to natural gas. It’s been maybe two weeks of me troubleshooting and replacing. I have a new gas valve and transformer in the furnace. There is 24v running to the valve and it clicks to open but no gas comes out. I have exhausted all my options with the mechanical/electrical components on the furnace. I have bled the valve to be sure that there was gas making it to the inlet side. Does anyone have an idea as to why the valve stopped opening once I converted it over? I have tripple checked to make sure that everything is installed correctly. another odd thing is that when the valve calls to be open (even though I shouldn’t) I can smack it and the gas flows. that made me think to change out what I have changed out. is it possible that too little or too much pressure to the valve would cause it not to flow gas?

• Answer:I realize this is probably a dumb question, but it has to be asked, just so everyone else won’t have to wonder. Are you dead sure you put the valve on in the right direction? I’m not a certified furnace installer or repair person, so I don’t actually know if it’s even possible to put a valve on backwards, so, the question. It certainly sounds like you’ve done everything that could be done, other than to take the valve off and try getting it to open while it’s off. If it’s opening, it should do it on a bench, with 24 volts going to it. You may have to take the transformer with it to be sure, and actually look up in the holes to see if you can spot the flap opening up for the gas to flow. You haven’t mentioned a pilot at all, so I have to wonder if this is an igniter type system? That would be my methodology of checking the valve and the transformer. If you can get it to open on the bench, then it certainly should open in place.

Associated Furnace Gas Valve Question:what is the maximum inlet pressure on a furnace gas valve?

• Answer:Typically it is 7in WC for a residential gas furnace. 3 1/2 inches is operating pressure at the valve, 13 inches in at the regulator. Street pressure is typically 2 psi.

Associated Furnace Gas Valve Question:What thermocouple controls the gas valve in this furnace?
I am in need of repair help with my motorhome furnace, since it’s being used this winter. The furnace is a “Suburban Model NT20A” in an old Explorer RV. Is a schematic available anywhere?

• Answer:take out the old one and take it to the store with you.

Associated Furnace Gas Valve Question:don’t know where the gas valve is to my tempstar furnace?
I have turned on the thermostat in my living room, programmed all the desired temperatures but nothing is happening. The directions on the furnace say it lights its self, but I’am thinking the gas may be off to it, but I can’t find the gas valve to it. Help………1st time home owners.

• Answer:Follow the gas line. It always leads to the gas valve near the furnace. If the valve is on, the lever will be in line with the pipe. If the valve is off, the lever will be perpendicular to the pipe. Also be sure all the emegency switces for tha ac power are ‘on’.

Question

I put in a 150k btu comfortmaker furnace last year for a friend.  Now the

furnace is shutting down on startup.  The Furnace uses a White Rodgers  model #

50A50-112 control module which provides an LED that “blinks” trouble codes.

The problem is it “blinks” six times and there are only trouble codes for

“blinks” of 1 to 5.  The module uses a “flame sensor that appears to be just a

piece of wire in the flame ( I assume it uses a plasma effect to detect the

flame).  Has anybody else had a similar problem?  Please E-mail at

if you have any ideas.

Answers

I saw this once before where there was no code for a 6 flash, it may be

something to do with neutral and hot mixed up where power comes into

control compartment or mixed up in conduit. Check and make sure neutral

is actually eventually connected to the neutral bar at your load center.

You may want to make sure that the furnace is grounded well.

I do know I had to call comfortmaker to help figure out what was

happening.

Associated Flow Furnace Question:

Carrier 3 stage furnace flow to all rooms evenly?

In my old house, one room got freezing cold when I switched to a 2 stage furnace. The duct was on an outer wall and furthest from the furnace. The old system heated the same room better. I dampened other ducts to give that room more air flow.

• Well, first stage supply temps on the 2 stage furnaces are lower than first stage of the standard forced air system. The btu output is about 30 percent lower or so on the 2 stagers supply, I’m guessing, 110 degree air instead of the standard’s 140 degree air. So, your colder room is getting lower temperature supplied to it. These kinds of furnaces perform the best in new construction or in condos where the insulation is even. I see them in those homes in gated communities and they are fine. But, the traditional furnaces that blast out the heat, i think, are still the best for the older homes. So what can you do about it ? You can’t go back, so you could insulate that run of duct to that cold room or the walls in it. That’s the only thing I can think of to make it warmer.

Associated Flow Furnace Question:Have little air flow coming from furnace through upstairs registers. Can I replace blower with larger blower?Have little air flow coming from furnace through upstairs registers. Can I replace existing blower with larger blower? The furnace is 20 yrs old, had this problem ever since I moved into the home last year.

• Answer:furnace may be too small, and old furnace fans only run 1725 rpm, newer ones run faster at 20 yrs its time for a new one, you can install duct booster fans [fits in the duct]

Associated Flow Furnace Question:

i am trying to convert up flow furnace in to down flow is that poss? can just turn the blower around ?

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 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 Flow Furnace Question:

why is my furnace over flow tube filling up with water now when the heat is on?

It used to only fill up in the summer with the air conditioner running.

• Answer:Is this a newer furnace? If so , is it a high efficient furnace? If it is it will have plastic venting and the water is due to the condensate produced from the low temperature flue gases. When gas burns one of the by products is water, ussually this makes it up and out the chimney when the flue gas is hot. On high efficient furnaces they absorb so much of the heat the flue gas temperature is much lower, and starts to drop the moisture out of the flue gas. Your venting is designed to slope back to the furnace and drain the water back to the drain. If the “flow tube” is overflowing then there is probably a problem with the drain line being plugged. At that point the heat exchanger can fill with water and the preasure switch for the venting will not work and the furnace will not run anymore. Water comming out is normal, water backing up into the furnace is not.

How can I increase the air flow from my furnace?

I have a dayton blower motor 6K778. It is 1/3 hsp and provides1725 rpm.

• Answer:You could get a Miltie speed replacement from A.O.Smith.

Associated Flow Furnace Question:

Can blockage of fan air flow from furnace cause carbon monoxide buildup? The A/C coil was plugged with debris.

The furnace tech got readings over 500 ppm of CO at the vent. He told us it was our heat exchanger that was leaking. As we were installing the new furnace, he discovered th A/C coil in the plenum was blocked with burned foil and insulation from the enclosure around the heat exchanger. The Heat exchanger seems okay, but has a scorch mark on it, as does the outside casing of the furnace (The furnace was suspended below and tight to a wood floor where this scorching occured). Was the furnace inspected properly, or was it a hasty call? They shut off our gas supply and told us we had to get a new furnace. Thanks.

• Answer:a stopped up evaporator coil will not affect the leaking of CO. on almost all furnaces/air handlers the fan draws air through the evaporator coil (A coil) and then blows it through the furnace heat exchanger. this is done for a reason. the induced draft blower creates a partial vacuum inside of the heat exchanger, by sucking the combustion air and gasses through it. if the return air supply was totally blocked (in your case it was only partially blocked) the inside of the heat exchanger would still have a lower pressure on it. when a heat exchanger fails enough to leak, it usually has a crack that most folks cant find. the reason it leaks is when the exchanger gets hot the crack opens up and creates a scoop that builds negative pressure on the down wind side of the crack. this scoop sucks out the combustion gasses into the surrounding air. if you have a saws all cut it apart and you will find a small crack that probably wont even be open when the unit is cool, but will gape when it was hot. the bottom line is, if you were getting 500 ppm CO out of a floor vent, you have a crack some where, and a bad one at that. Possum, HVAC guy ps… most 90+ efficiency furnaces can be installed zero clearance (touching) on all sides…so nothing to worry about there

Associated Flow Furnace Question:

When I replace my filter for the furnace, should the “air flow” arrows point towards the furnace itself or

towards the ductwork on the other side. Or to make it simpler, to the left or to the right. Thanks.

• Answer:you need to identify which ducts feed outward and which feed back into furnace. 1. find big vent in your house which is the feed going back into furnace 2. open the furnace door 3. locate duct feeding into furnace 4. and arrow of filter should be pointing opposite direction of feed vent

Associated 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 Flow Furnace Question:

Looking for the filter on a Williamson Therm flow oil furnace?

• Answer:some are in the door some are in a slide in box on the side , do you have an up flow or a down flow furnace / some are on top

Question

I’ve got a little Thermolyne oven (Thermolyne F-A1730, 1093C, 9″x8″x13,” 240v) that was built way back. The controller consists of a contactor (relay) that drives the elements and is switched on/off by a rheostat (labeled 0% to 100% time on) that drives a coil wrapped around a bi-metal strip that pushes a momentary contact switch when sufficiently heated. A meter (connected directly to the oven sensor and not part of the control circuit) shows the oven temperature (0C – 1200C) and reaches full scale with 70ma. I’d like to replace this with something a bit more up-to-date. I could probably duplicate its function with a timer circuit with variable on/off, but it would be nice
to have a thermostat mode that used the sensor to keep a constant temperature.

Anyone designed and built something like this? I’d love to get pointers to schematics, books, web sites, etc.

Answers
There are tons of fairly cheap, exceedingly reliable devices (many
multifunction/ramp ones under $500, some much cheaper, less than $200,
depending on the desired functionality).  There are on/off controllers
for even less.  The Omega company sells slightly overpriced products
using a very well written set of catalogs that explain things very
well.  There are many other vendors selling the same sort of things
(Dwyer is a pretty good discount vendor).  Surf over to
www.thomasregister.com and check out the listings under “controllers:
temperature” (don’t hesitate to register with them, Thomas Register is
_the_ industrial yellow pages, very well respected, and found in every
library.)  After the initial page of listings comes up, you can narrow
to your state using the selector on the bottom of the page.

You can also check out your local phonebook under “thermocouple”.
Those companies will probably send out a rep to your site to see your
set-up and recommend an item.  What you want to do is standard fair.

Basic controllers (<$150) just check the temperature and turn their
relay either on or off.  Middle range controllers ($200-$600) can hook
up to anything that gives them thermocouple or any other sensor
feedback and then control virtually anything through either built in
relays or proportioned outputs.  High end controllers (>$600) can put
your furnace through controlled ramp schedules, remember multiple
schedules, and interface with a computer for datalogging if you want.
It’s pretty much determined by the price you want to pay.