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Old 12-03-2008, 08:20 PM   #16
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Gas Valve


I can't tell anything from the pic, can't magnify it.

The only advice I would give you further is the gas press should be checked.

The reason i say this is because you have an older furnace and if that new valve is maladjusted (passing too much gas) it might burn a hole in your heat exchanger. That's means Carbon Monoxide in the home. Deadly.

It should be set at 3.5'' WC. You need a manometer to measure this. The valve puts out up to 5"wc. If it's set at max you have to get it back in spec.

Hope you getting it going trouble free.
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Old 12-03-2008, 08:56 PM   #17
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Quote:
Originally Posted by hvaclover View Post
I can't tell anything from the pic, can't magnify it.

The only advice I would give you further is the gas press should be checked.

The reason i say this is because you have an older furnace and if that new valve is maladjusted (passing too much gas) it might burn a hole in your heat exchanger. That's means Carbon Monoxide in the home. Deadly.

It should be set at 3.5'' WC. You need a manometer to measure this. The valve puts out up to 5"wc. If it's set at max you have to get it back in spec.

Hope you getting it going trouble free.
I have the Essex SX242N on the unit now. Here is the web page I got the cross reference from: http://air-n-water.stores.yahoo.net/hovr21stpiga.html

I say it is set at 3.5" wc. You can check it and see if there is any other items I need to be aware of. I appreciate the help, this is my first stab at genuine furnace work, not worried but being careful to check for leaks and collect as much info I can before starting the job.
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Old 12-03-2008, 10:40 PM   #18
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Ok it looks alright as a generic replacement.

But rule number one in HVAC....DOUBLE CHECK ALL SAFETY SPECS.

Especially with stuff from EBAY
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Old 12-04-2008, 10:34 AM   #19
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Originally Posted by 1610 CUB View Post
Thats not the way to treat a DIY poster. The man is looking for a gas valve, if you cant help him stay at home, and going out on a social rant, is just wrong! Suggesting a new furnace is or should be a consideration is one thing but comparing your age to his furnace........... unbelieval
I think the point they were making is that the furnace has seen the end of it's life and needs to be replaced. A new controller would be easy to get and install but it would be like putting on a new set of tires on a car with a bad engine, transmission is slipping and the body is rusting badly. The tires will be worth more than the whole car and the car will be in the junkyard before the tires wear out.

The advice is sound in considering a new furnace. Gas prices will only go up and getting a 90+ will seem like a real good decision a few years from now.
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Old 12-06-2008, 01:46 AM   #20
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beenthere & hvaclover know the trade -- I will give my 2 cents --gas valves don't go bad --- they may get stuck from moisture --- the gas company wont tell you this because they sell you gas not water
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Old 12-06-2008, 02:30 AM   #21
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Fuzzybunny:

Pipe dope works well, but I really don't know if there's a special teflon tape that's made specifically for gas or not. It seems to me that ANY teflon tape should work on NPT threads because they're tapered and the tape gets squashed between the male and female threads as the joint is tightened, thereby sealing up any leakage around the threads.

BUT, after installing your valve, take a few minutes to mix some liquid dish washing detergent 50/50 with water and use a small brush to paint that solution onto every connection you made to install that gas valve. If there's gas leakage through any of those joints, it'll show up as bubbles being blown in the soap solution. That tells you ya got a leak, and ya gotta fix it to be safe.

PS: As regards the horsing around in here:
I think people gotta realize that no one's getting paid to hang around here and give advice. I think people also gotta realize that the original poster has to take what's said with a grain of salt. No one can see the furnace. No one in here can tell what condition the furnace is in. So, if people want to speculate on the condition of the furnace, it's fair for the original poster to take that at face value, which is exactly what it is... speculation. The original poster is not going to start replacing a furnace based on speculation by someone on the internet, they're going to wait until someone who's actually seen the furnace says there's a crack in the heat exchanger or something that warrants replacing the furnace.

But, I think it's appropriate for the so called "experts" in here (since not one of us know everything) to choose their words carefully so as not to cause alarm. That's good advice 24/7/52. The problem is that people that don't know anything might figure that talk about replacing the furnace cuz of it's age might wonder if it was even wise to seek advice on this board. Maybe let's stick to the questions and remember that it's easy to unintentionally scare the living $#!^ out of someone not prepared to start replacing their furnace for big bucks. And, from our perspective, scaring someone is not the least bit helpful or productive, nor is it what we spend our time on these DIY forums to do.

Last edited by Nestor_Kelebay; 12-06-2008 at 02:46 AM.
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Old 12-06-2008, 04:35 AM   #22
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Not all teflon tape is approved for gas.

Check the label before buying/using.
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Old 12-06-2008, 05:00 AM   #23
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Originally Posted by beenthere View Post
Not all teflon tape is approved for gas.

Check the label before buying/using.
Bingo.

Yellow tape is good for gas but the white tape is not and will fall apart over time.

The initial test will pass but it will not stay sealed and will start to leak gas.

You can't go wrong with pipe dope. It will work for everything. I especially like the teflon dope as it is very forgiving and seals even if there is water on the pipe. But don't get this stuff on anything other than the pipe. It will not wash out and make permanent stains on clothing and furniture.
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Old 12-06-2008, 08:39 AM   #24
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Quote:
Originally Posted by Marvin Gardens View Post
I think the point they were making is that the furnace has seen the end of it's life and needs to be replaced. A new controller would be easy to get and install but it would be like putting on a new set of tires on a car with a bad engine, transmission is slipping and the body is rusting badly. The tires will be worth more than the whole car and the car will be in the junkyard before the tires wear out.

The advice is sound in considering a new furnace. Gas prices will only go up and getting a 90+ will seem like a real good decision a few years from now.
Thank you for the goodwill Marvin. We can't be all things to all people, and sometime a strong opinion can be construed as "rude, crass", and other wise "ilmannered". Not the Case for me..

I
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Old 12-06-2008, 09:48 AM   #25
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Quote:
Originally Posted by hvaclover View Post
Tank you for the goodwill Marvin. We can't be all things to all people, and sometime a strong opinion can be construed as "rude, crass", and other wise "ilmannered". Not the Case for me..

I
I think everyone was looking out what was best for the OP.

Like you say, sometimes things are taken wrong even though they meant well.
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Old 12-06-2008, 09:55 AM   #26
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For the record, I was not offended or dissuaded, I knew that have an "ol beater" unit and would love to have one of those high fallutin' 90% efficient models but this unit really only takes care of one a half rooms and is going to only run at night and mornings for the most part. I just need heat so I can see my winky in the morning!!!
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Old 12-06-2008, 10:05 AM   #27
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Quote:
Originally Posted by Fuzzybunny View Post
For the record, I was not offended or dissuaded, I knew that have an "ol beater" unit and would love to have one of those high fallutin' 90% efficient models but this unit really only takes care of one a half rooms and is going to only run at night and mornings for the most part. I just need heat so I can see my winky in the morning!!!
Get a hair dryer for now and save the money for a new furnace.
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Old 12-06-2008, 10:17 AM   #28
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Quote:
Originally Posted by Fuzzybunny View Post
For the record, I was not offended or dissuaded, I knew that have an "ol beater" unit and would love to have one of those high fallutin' 90% efficient models but this unit really only takes care of one a half rooms and is going to only run at night and mornings for the most part. I just need heat so I can see my winky in the morning!!!
I ain't seen my winky in years. There is this huge tire blocking my view when I look down
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Old 12-06-2008, 10:29 AM   #29
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Quote:
Originally Posted by hvaclover View Post
I ain't seen my winky in years. There is this huge tire blocking my view when I look down
You what they say, when you have a tool that nice, you have to have a good shed over it!
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Old 12-06-2008, 10:39 AM   #30
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Quote:
Originally Posted by Nestor_Kelebay View Post
Fuzzybunny
:

Pipe dope works well, but I really don't know if there's a special
teflon
tape that's made specifically for gas or not. It seems to me that ANY
teflon
tape should work on NPT threads because they're tapered and the tape gets squashed between the male and female threads as the joint is tightened, thereby sealing up any leakage around the threads.

BUT, after installing your valve, take a few minutes to mix some liquid dish washing detergent 50/50 with water and use a small brush to paint that solution onto every connection you made to install that gas valve. If there's gas leakage through any of those joints, it'll show up as bubbles being blown in the soap solution. That tells you ya got a leak, and ya gotta fix it to be safe.

PS: As regards the horsing around in here:
I think people gotta realize that no one's getting paid to hang around here and give advice. I think people also gotta realize that the original poster has to take what's said with a grain of salt. No one can see the furnace. No one in here can tell what condition the furnace is in. So, if people want to speculate on the condition of the furnace, it's fair for the original poster to take that at face value, which is exactly what it is... speculation. The original poster is not going to start replacing a furnace based on speculation by someone on the
internet
, they're going to wait until someone who's actually seen the furnace says there's a crack in the heat exchanger or something that warrants replacing the furnace.

But, I think it's appropriate for the so called "experts" in here (since not one of us know everything) to choose their words carefully so as not to cause alarm. That's good advice 24/7/52. The problem is that people that don't know anything might figure that talk about replacing the furnace
cuz
of it's age might wonder if it was even wise to seek advice on this board. Maybe let's stick to the questions and remember that it's easy to unintentionally scare the living $#!^ out of someone not prepared to start replacing their furnace for big bucks. And, from our perspective, scaring someone is not the least bit helpful or productive, nor is it what we spend our time on these DIY forums to do.

BIG FYI FOR
DIYers
concerning furnace age.

When a furnace reaches 30 years a Pro will in most cases suggest replacement. The reason 30 years is the golden number (actually between 30 and 30 years depending on the brand and the maintenance of the furnace).

It is a proven statistic that by 30 the furnace heat exchanger is weakened to the point the point where the heat exchanger cell can open up like a clam shell and kill families why they sleep. There are always stories in the news about this.
To some who are not in the
hvac
biz it seems that a Pro is just trying to needlessly sell a new furnace. I won't say there aren't some shyster out there, but you won't find them here giving advice if they are not getting paid.

I have experienced two close calls where I wa the the second or third opinion on an obviously bad furnace. I would not repair it becase of it's age and other telltale signs of detirioration.

Later in the week I hear on the news of how a customer had afriend who handy fix the furnace. The people never woke up. The furnace was 30 years.
Had that been me I would not be able to sleep and i would probably be in jail.

My personal policy is to err on the side of safety and not repair a furnace that old.

Most pros think the same way.
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