The combination gas valve explained

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Disassembly of the combination gas valve. The control is compared to the gas chain control illustrated on an earlier video. This valve is used in many gas appliances. I show how the thermocouple works and how it is used to keep the unit from running without a pilot flame. I also discuss the regulator and how to adjust it.
This video is part of the gas furnace series of training videos made to accompany my website: www.grayfurnaceman.com to pass on what I have learned in many years of service and repair. If you have suggestions or comments they are welcome.
If you are a homeowner looking to repair your own appliance, understand that the voltages and fuels used can be lethal and can cause a fire or explosion. Know your limits.

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9 июл 2024

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Комментарии : 363

@totalchaos444 2 года назад

10 years later and it is still a useful video.

@hjc4604 5 лет назад

Thanks for the great explanation of the combination valve. Nothing beats seeing things taken apart and explained.

@subarutruck1 10 лет назад

Had the identical unit and this was a big help in helping me understand the operation!! You the man!!!!! Heater back up and running! Thankls a million!!!

@Nick-fv1hd 4 года назад

Well done. It is always a pleasure listening to a dissertation from a tradesman who knows what he’s talking about.

@CBrown07696 Год назад

I had never touched a floor furnace until recently. A company I do so subcontracting for took over an apartment complex with over 40, 4 unit buildings. I am amazed these things are still in use! I told them I didn’t know anything about them but they assumed since I do HVAC troubleshooting for them I could figure it out. Thanks for this old video!

@CarlosHernandez-gv5wb 9 лет назад

The way you explained makes me easy to understand, thank you very much for the video.

@realuniversechannel1 6 лет назад

This is one of the best videos explaining how a gas valve operates, period.

@grayfurnaceman 6 лет назад

Thanks for the support. GFM

@anthonyhitchings1051 6 месяцев назад

A while back I replaced the combination gas valve on our 1964 furnace. Thereafter, I noticed that the burners made a whistling sound (most likely from the gas orifices on the manifold). Eventually, using a water manometer, I dialed the manifold pressure down from 3.5" to 2.75", and the whistling was weaker. Fast forward to today, and using a digital manometer I fiddled with manifold gas pressure again. It would not go above 3.5", and would not go below about 2.66". At around 2.85" the whistling became quieter. Later today, while on our daily walk, my wife comments that the furnace always whistled!

@grayfurnaceman 6 месяцев назад

Gotta listen to the expert. GFM

@jeffkreft9872 5 лет назад

Great video, thank you for taking the time to explain these type of gas valves. Although not used in modern furnaces, you still find these in gas operated hot water heaters.

@grayfurnaceman 5 лет назад

Welcome GFM

@cedricpod 10 лет назад

This is a marvelous set of views of the inside. Thanks so much. Any additional explanation you can provide will be as useful I suspect. I direct people to your video.

@niner_six_echo 8 лет назад

Solid information. Thanks for posting your videos. I'm going to R&R the gas valve in my fireplace today. Watched your video on that, too.

@grayfurnaceman 8 лет назад

+Mike Florey Welcome GFM

@Mancavedweller1 8 месяцев назад

Fantastic video, thank you very much. I always love knowing how things like this work.

@mostlikelywedoitservices6926 2 года назад

Really enjoyed your presentation. I work with them all the time. Never took one apart due to possible leaks and you can't rebuild them. So I just throw them out and get replacement.

@johnjacobsen1915 5 лет назад

been wondering about this valve... thanks!

@jacklam5658 5 лет назад

very good video that explain this valve ! Thank you so much !

@dragonlordship Год назад

Thank you for teaching . 🎉 there are not lot of people explaining this very well like you

@BobDiamondRPhNC 10 лет назад

Thank you, GFM. This is exactly what I needed. I've been working on an older ventless gas fireplace log in my home and couldn't figure out the regulator system. You are a good teacher. -- Bob

@Parabellum-X Год назад

Sir, thank you so much for producing this highly educational video! You have no idea the trouble I have been having these past two weeks trying to fully grasp this simple concept of how a combination gas valve works! I've read the five or six pages in my college text book (Refrigeration & Air Conditioning Technology, Ninth Edition, by Eugene Silberstein) numerous times; but I just couldn't get a clear understanding of it until I watched this video!

@grayfurnaceman Год назад

Glad it helped. GFM

@nicholasceea4109 9 лет назад

Great video, I always wondered what was inside of these.

@Rayram555 3 года назад

The best explanation I have seen . Thank you.

@isonlynameleft Год назад

That is awesome! I have worked with these valve's for years but did not want to take one apart because they can be pretty expensive, also time. Thanks!

@Whelessry 3 года назад

I finally figured out whats wrong with my gas fireplace!!! Thanks to you. Couldn't find info on it anywhere

@grayfurnaceman 3 года назад

Glad you got it going. GFM

@MrCarltonjoe48 9 лет назад

I love your videos ever since I started in this field 7 years ago. I have a huge textbook which pairs nicely with your videos thanks so much for the teachings. im a maint. supervisor at an apartment complex and I recommend your videos to new techs to see the correct way of doing things and principles behind proper operation.

@grayfurnaceman 9 лет назад

Carlton Joe Thanks for the support. GFM

@hennygirmawi3898 2 года назад

Thank you for helping me understand how a gas valve work.

@crazeygrazey 10 лет назад

For a long time I have wantes to know how the gas valve operated in a device unattached to the mains electricity supply and no battery. Wikipedia was useless, only explaining how thermocouples worked which I knew already. The thermocouple-operated miniature solenoid came as a surprise as I would have thought that the thermocouple would not be able to operate a solenoid under its own power, but it does. A great explanation and a great series. Thank you.

@sidneycook8031 7 лет назад

crazeygrazey

@aquabono 4 года назад

Gotta love these simple units with the steady pilot light lit all the time. For about 2 cents a day in fuel, it keeps draft up the chimney and reduces bugs wasps and the moisture levels.

@andystitt3887 3 года назад

.60 a month.

@hongvietnguyen2313 Год назад

Thank you for your showing, really helpful.

@angelarroyo8248 7 лет назад

Thank you Sir, I think you are absolutely wonderful, thank you for all your educational videos.

@grayfurnaceman 6 лет назад

Welcome GFM

@r.t.7925 11 лет назад

Thank you for sharing your knowledge :)

@howardtoob 7 лет назад

This is a great explanation. Many thanks

@grayfurnaceman 7 лет назад

Welcome GFM

@karlparsons2031 4 года назад

Thanks for your efforts. Very helpful ! Keep it up !

@grayfurnaceman 4 года назад

Welcome GFM

@markeldamgaard 3 года назад

We are learning about these in school and this helped me out allot thanks.

@grayfurnaceman 3 года назад

Welcome, good luck in the business. GFM

@markdionne 10 лет назад

The video is great, but it leaves out one important thing: the second solenoid, which was not shown and sits under the electric terminals, routes a small amount of pressurized gas to the bottom of the big diaphragm which effectively operates the main outlet valve (and also regulates the pressure). Gas pressure is used as the operating force for the main valve. This is important on "millivolt" versions of this valve, where a bigger 700 millivolt thermopile provides all the electricity to operate both solenoids. The thermopile would have to be very large to provide enough power to operate the main gas valve all by itself. 190055joe asked how 20 mv can operate the solenoid. The voltage does not "pull in" the solenoid, it just holds the solenoid in its fully-in position. That takes less current/voltage. The solenoid is "pulled in" when the Pilot button is pressed in by the person lighting the pilot.

@grayfurnaceman 10 лет назад

Actually I did mention that it is pilot operated. I did not explain the operation of that part of the valve because this video is more about how the pilot safety works than how the gas is used to open the valve. Perhaps I should do one on how a pilot valve works. Thanks for the thoughts. GFM

@dtrrtd774 6 лет назад

That's the key part of the system that I was wondering about; this video cleared it up as the pull in current for any kind of useful solenoid would be far too high for a thermopile to drive, but since it's the human operator that supplies the force to pull it in, only a small amount of current is needed to maintain it above the drop out voltage of the solenoid coil. Your further description of a gas pressure operated relay completes the system, as the main gas actuation has to be done without human intervention.

@vemlacduong1954 8 лет назад

You are the best instructor in HVAC . I wish you have an happy thanks giving to you and your family .God bless you .

@grayfurnaceman 8 лет назад

+quang nguyen Thank you and the same to you. GFM

@brizzx32 7 лет назад

GFM I think you left out an important part of the valve Solenoid. Thermostat is suppose to switch the heater on. Come across where not enough voltage on the micro thermostat and does not switch the valve on. Pilot is on but therm does not turn on valve.

@grayfurnaceman 7 лет назад

What the heck are you saying? GFM

@brizzx32 7 лет назад

I see this problem alot, on wall heaters were pilot is on and thermostat is not letting the gas flow. Checked at the thermostat, jumped and gas valve turns on just fine. I believe this is a problem with solenoid but I could be wrong. On a milivolt system

@brizzx32 7 лет назад

I guess I should rephrase my comment in a form of a question. When th pilot light is lit but the milivolt thermostat does not turn on gas valve. But thermostat is checked and working fine also on top of that wires being jumped at the Thermostat and then the Heater fires up just fine. I don't know what causes this problem. Is there 2 soleniod valves 1for the Thermopile and another for the main valve when switched at the Thermostat that turns on heater? Sorry for the dyslexic comments before this one.

@jimedgar6789 8 месяцев назад

Freaking brilliant explanation! I am wiring my millivolt gas fireplace to a WiFi module for Alexa to turn off/on cause the girlfriend is lazy. Needed to understand how to the valves worked and where I needed to set the transistor-controlled switch to give the 700mV to the main valve.

@gdeangelkick 6 лет назад

Great explanation. This type of valve is on a lot of builder drop-in fireplace units. I was getting mixed up about where to check the thermocouple voltage, now I understand why there is no terminal for it, it's that copper line into the solenoid. Thanks! Unfortunately I still don't know why my fireplace won't light... I got voltages that now check out after cleaning the thermopile -- when it initially failed the voltage was too low and they were fithy. But it still won't light. The troubleshooting things says one other test beside the thermocouple -- to check a the continuity from a safety magnet to ground -- which I can't find. I guess I'll have to replace the whole valve assembly.

@boomer-ms9im 7 лет назад

thanks, video took out that intimidation factor and i replace the valve myself

@vincentpadalino8003 8 лет назад

Another great video

@grayfurnaceman 8 лет назад

+Vincent Padalino Thanks for the support. GFM

@imkrane 5 лет назад

Awesome video, love the detail, I just learned all there is to know about it in 8 minutes, how great is that??? Thank you...

@InternetDude 5 лет назад

Great video! When I light my pilot the button doesn’t pop up quickly, rather it takes almost a minute to pop up high enough to move it to ON. Should I be concerned? 1977 Lennox (I have a video on my channel). There is no screw on the button or I would try to put a drop of oil where the screw goes. I don’t see a way to lube it...

@somap8380 2 года назад

Thank you Gary. 🙏🏾❤️

@ScientificSolutions 3 года назад

Thanks so much for saving me the trouble of curious disassembly! I run an electronics lab and was curious as to how a ~30mV signal could hold a solenoid open without extra amplification circuitry. It's also nice to see the thermocouple solenoid come out so easily; a couple of additional pointers may have been helpful such as: can you simply take out the thermocouple solenoid while the gas is switched off? and can you generally purchase the thermocouple solenoids by themselves or must you purchase an entire combination valve?

@hg2. 4 года назад

Great video - thanks!

@onelectriccarsandtheenviro9383 4 года назад

Welcome GFM

@czar1177 5 лет назад

Great video, do you know if I can buy the thermopile magnetic valve anywhere. Thanks

@antoniokarrillo5853 4 года назад

Super helpful, thank you

@grayfurnaceman 4 года назад

Welcome GFM

@grayfurnaceman 12 лет назад

It is a gas pressure regulator for the manifold. It is a flame safety control (thermocouple flame safety). It is a manual shut off valve. It is an electrically operated solenoid valve. Hope that helps.

@AP-bo1if 6 лет назад

question. I took apart a thermostat (KKTB type model), for a convection oven (gas stove burners and electric oven). has baking (BA), broil (BR) and C(convection?). when i turn the knob for oven the heat element won't go on (I never used the oven after years and this is like the first time I used the oven function - so it can be considered first time). the oven at first came on very high temperature and then after wouldn't come on again. i took it apart to diagnose what the problem could be. the oven part is mostly hardwired, thermostat -> relays -> heat element (bottom and/or top). when i took off the thermostat the parts inside imploded, i put it back together but it seems that the 2 leads (+ and -) going to thermostat to control whether on or off connection is made are always connected state. the springs holding the bracket regardless of whether they are pressed or depressed, a connection (continuity) is always present. this is the only logical way i could find to assemble it back yet it doesn't seem to be correct. there is two brackets, one braket moves kind of up and down to connect to the leads. the other has a spring attached which goes back to the first bracket. then there is the second half of the box which has a round metal piece which is connected to the thermostat sensor, this goes on top of the first bracket. any idea about this type of thermostat?

@lubime10 5 лет назад

Excellent !!!

@aftabex 4 года назад

Great video sir thank you

@grayfurnaceman 4 года назад

Welcome GFM

@medhaniemaashio3680 3 года назад

Thx man good video

@tcwphalanx3942 6 лет назад

Excellent job Thanx.

@grayfurnaceman 6 лет назад

Welcome GFM

@GraeneyMac 5 лет назад

Lovely! Thank you.

@grayfurnaceman 5 лет назад

Welcome GFM

@juliocv719 3 года назад

NICE DRILL OLD MAN

@wdhewson 10 лет назад

Thanks. That helps me understand why the regulator adjustment is so "insensitive", meaning that one screw rotation changes the pressure just a small amount. I guess the screw tensioning (or relaxing) that big weak spring centered on the diaphragm.

@meti903 6 лет назад

Hi i have a pitco frialator fryer and it works fine but right before the temp starts to drop and wants to turn back on i smell gas than it turns on and the smell goes away and i thought that the combi valve is bad and replaced it but still have the same problem thanks for your videos.

@javaidiqbal4143 4 года назад

good explained

@gquint194 4 года назад

Thank for you this video, it was very informative. So if my flames on my propane deep fryer are not blue but yellow, which way should I turn the regulator? I was told they should be blue so they’re burning at a high enough temperature.

@diegoreyna405 3 года назад

Turn the regulator Clockwise. There’s a reason why you’re not getting enough gas. A manometer should determine the w.c pressure. Should be 10-11 for LP and 3.5 for Natural gas.

@andrewprudente4294 2 года назад

Hi Mr. Gray: I have a ventless gas stove and I would like to convert the thermocouple to an external digital type. If it's possible, can you explain how that can be done?

@gyver471 4 года назад

Great video can you do a video explaining the terminals on the gas valve and what they do exactly? Thanks

@frankortolano5886 5 лет назад

Excellent

@Sanaa1artist350 5 лет назад

i have Rheem gas furnace the pilot light not sty on i change the thermocouple still not sty one i get 24v on gas valve . its possible the valve be bad ?

@Hvacmaniac97 9 месяцев назад

Thank you craig

@jaystern5936 7 лет назад

Very thorough videos. I installed a Williams Montery (wall furnace) that I bought used. Didn't work until I replaced the thermopile. (I disassembled everything except the burners and control to clean the furnace.) Then the pilot ignited just fine but the burners did not light. The troubleshooting guide said to replace the gas valve (Robertshaw 710-502) which I did. The furnace now works very well. I took apart the old valve to see what failed. Everything looked good. When I tested the various terminals for continuity, I had good results. There is a wire from (what I think is) the burner control solenoid over to the terminal block. I get continuity there too. Should there be continuity when the valve is not connected to a source of electricity? From your articles, I get the feeling that this is a short, leading to what some call a "stuck valve." Is that what it could be? I couldn't pull out the soleniod, but based on your article for "chain control," I suspect that it the problem. Please comment.

@BURNHOT26 7 лет назад

Williams Enclosed Hearth Heater model number 5001911. Pilot stays lit and main burner not firing up. Attempted to purge the air out of the line via the pilot tube but found minimal gas pressure in line. I heard no gas flow when opening the shut off valve to purge. Replaced integral twin stage regulator out by propane tank. Pressure is audible now and enough to purge line. Pilot light stays lit with blue flame Millivolt reading 30mV on thermocouple. Pilot knob is set to "ON" position. Problem: Turning the control valve to maximum, gas valve not opening. After shutting off pilot light, 180+ seconds later the "click" can be heard of solenoid disengaging from magnet in gas valve. Question: How can the solenoid open and there be no gas coming out to the burners? I'll cut and paste this same question on some of your other videos in hopes of getting it noticed.

@grayfurnaceman 7 лет назад

Your system is, I believe, a thermopile system. The thermocouple holds open the pilot solenoid. The thermopile operates the main solenoid. I would guess the thermopile is weak or there are loose connections. Hope this helps. GFM

@seansullivan2181 4 года назад

Great stuff GFM! Thanks fr putting forth the effort to help educate others!! Question... I have an older Empire Rh-65-1 space heater. This unit does not use any electricity. I had some problems that I think I've resolved. I've taken the burner and the main burner orifice out and cleaned them both to get rid of the loud resonating and yellow flame.. I have the primary air adjustment screw turned all the way in but still get some extinction popping and occasional resonating (but not nearly as bad as before cleaning). I notice a small yellow flame about 1"-1.5" at the main burner orifice when the pilot light is lit and no heat is being called for. The thermostat seems to be working fine as I can turn it up and it lights the main burner every time. But when the temp rises and the burner kicks off the flame is still at the orifice. I am concerned that the gas valve is bad? Empire sells a replacement valve R1624. I believe that is the Robertshaw 700-204? Its almost $300 through Walmart. Im not opposed to replacing it but don't want to spend the money if there's a cheaper fix. Any help here would be greatly appreciated!

@grayfurnaceman 4 года назад

The leaking by of the valve condemns it. I would not use the heater with that valve. The 700-204 is a hydraulic valve probably similar to the original. There could be some mounting issues if there is temp control rod mounted on the valve. GFM

@mark.r8900 3 года назад

does this valve works the same as those dual intermittent pilot gas valves that use with intermittent spark ignition module? i was working on a york RTU with two gas valves. the terminals on the gas valve were TR, TH/TR, TH. the TH/TR was connected to PV of ignition module. the TH was connected to MV of the module. the TR was connected to ground. if i were to measure from TH/TR to TR i should get 24vac to open the pilot gas correct? and if measured from TH to TR i should get 24vac to open main valve for burner correct? so does this mean this gas valve has two coils? one for pilot gas and one for main burner? thank you.

@jamesp.odonnelljr.7170 2 года назад

I just installed a new pilot assembly W010-0790 ( it has both a thermocouple and thermopile ) on an old Napoleon fire place. It has a Robertshaw/Grayson gas valve. My problem is that my gas valve doesn't have a port to thread in the single copper wire from the thermocouple. I think my gas valve has a wire coming out of it that used to go to a separate thermocouple control ( probably held mercury ) that they no longer make. Can you tell me how I could get this hooked up ? Thanks in advance !! Jim ODonnell

@mikepier1 9 лет назад

Great video , thanks. I recently had to change a bad RobertShaw gas valve on my Weil-McLain steam boiler. I have 2 questions: Is it possible to just replace the magnet part, and not the whole valve? Are all valves adjustable? I replaced mine with the exact replacement, and I did not adjust anything with regards to the regulator. It seemed the old one I took off, the adjusting screw was not removable, so I'm assuming it was fixed?

@grayfurnaceman 9 лет назад

Mike Pier Some OEM valves could not have the manifold pressure adjusted. If the new one is adjustable, it should be set to factory specs. Hope this helps. GFM

@veer77 5 лет назад

Great video! - the only one I could find that actually had this information. Easy question - does the control valve solenoid also control the pilot light line, or does that bypass the main gas outlet and solenoid controls? I seem to be getting no gas to the pilot..

@derrickanderson2783 2 года назад

Most likely the thermocouple...

@bpastorb 7 месяцев назад

Hey really appreciate the video! I was just wondering if you could explain what it means when the pilot nob does not spring back when released (in the pilot setting). For example, the pilot lights as normally during start up procedure, however once I let go of pressure on the knob, it does not spring back to the closed position. If I slightly tug on the nob it then shuts off.. In the owners manual for the unit, it specifically mentions if this happens then to shut it off immediately and call for a qualified service/maintenance provider. I have shut the unit off, just wondering if this is typical of a specific problem? I am sort of assuming it will need a whole new combination gas valve?

@grayfurnaceman 7 месяцев назад

If the knob does not pop back up when released, it is now a safety hazard. It must be replaced. GFM

@fredbowens1964 2 года назад

great video what would keep the pilot knob stuck at the pilot position. I won't turn on or off

@grayfurnaceman 2 года назад

The valves sometimes jam inside the valve. Means a new valve. GFM

@RB-nm3ko 4 месяца назад

While pressing PILOT, eventually the solenoid keeps the pilot light valve open. So what then does the ON setting do? I'm trying to follow how the ON valve is first but the pilot light valve opens first ? Thanks

@88s10Durango 4 года назад

Hi , I have one of these valves from my old 9,000 Btu camper furnace , Its a Honeywell version , could not find the model # ,, on miy valve the Pilot , on off knob will not turn anymore , its stuck in the Pilot position , I have taken it apart and cannot figure out why . Any ideas what could be stopping it from turning ?? It isa 1976 year model , thanks ..

@rickysantoro6225 7 лет назад

good video, thank you, just have a question, hope you still are around to respond, is it possible for debris to hold that big circular thin rubber vavle open, i constantly have a flow of gas from the out port as long as the pilot is on, or do you think that it has ruptured? also it didn't leak for the first 2 months of operation, and now makes a squeek sound when it closes

@grayfurnaceman 7 лет назад

Replace the valve. I have never repaired one and do not recommend any repair of these valves. GFM

@dfigueroa903 4 года назад

Do the solenoid ever go bad... if so, can it be replaced .... I’m thinking... yes, no????????? ...I’m working on a Honeywell V810A1210 gas valve and the price brand new is $365.00 .... haven’t tested yet( the thermocouple for DCmv) ... just want to cover my bases, as you know it’s a old furnace.....you showed in your video, the seloniod... trying to look for this part.... can you help me please....

@ferventheat 7 лет назад

thanks for video. I believe I have a combo gas valve. I foolishly took it apart and some of the oil(?) leaked from the thermocouple area. do you know what is the liquid in there? it looks like a light oil but I cant be sure.

@grayfurnaceman 7 лет назад

Its probably a hydraulic valve. I don't know what type of oil it is. GFM

@MrMetalhead0124 Год назад

the flow control adjustment that you shown in your video, is that for the pilot of the main gas flow control for the burner? I want to get a gas flow control valve that can have a wired thermostat that runs of a power pile. My existing heater is an old Coleman dual sided wall heater and it inconvenient to adjust the heat and a wired thermostat would solve that problem.

@grayfurnaceman Год назад

There are 2 flow controls on the gas valve. One is a set screw for the pilot adjustment and the other is a manifold pressure adjustment. Neither will work with a thermostat. However what you may have is a hydraulic valve that has a temp sensing bulb and an adjustment to change the gas flow to the burner. If it is a hydraulic valve there is no way to control except by adjusting the knob. GFM

@MrMetalhead0124 Год назад

@@grayfurnaceman I was planning on purchasing an entire Williams Monterey Plus gas valve, thermostat, stack senser, and pilot/power pile and removing my old gas valve to replace it with the Williams equipment. Thank you for your response!

@fredla7353 Год назад

Any advice on where the adjusting screw is for the pilot light flame on a Tiara II-B ? I replaced the Thermocouple Assy. with a new one from H+Home Tech. Tagged all wires, etc. and replaced as undone. Everything works, including the remote Themostat and control. However the pilot flame is 3" or 4"+ High and wide coming out of the pilot hood. Thx.

@grayfurnaceman Год назад

There is a pilot adjust slot head on top of the valve. Marked pilot. However, if the pilot is that high, you probably do not have an orifice installed in the pilot tube where it connects to the pilot assembly. GFM

@rayc1503 5 лет назад

Stay blessed always, clear and precise. Are these considered multi-function gas valves? Are they used in gas fireplaces?

@grayfurnaceman 5 лет назад

This type valve operates on 24 vac. It can be used on most pilot safety applications. There is a millivolt type that operates only on millivolts usually for fireplaces. GFM

@yu-iw2pw 3 года назад

thank you for your video.just wondering how the valve control the diagram shut on/off , the main gas stop supplying when the thermostat reach the set tepmture , how it work ?

@grayfurnaceman 3 года назад

The valve is a pilot operated one. A solenoid opens a small valve that allows the gas pressure to fill the diaphragm and open the main valve. Hope this helps. GFM

@yu-iw2pw 3 года назад

@grayfurnaceman thank you for your reply .Is that solenoid which hold the pilot? Gas keep coming in when the the pilot stay lit , is that mean the main gas keep pressure the thin diagram , but when we turn off the temp thermostat off , the pilot stay lit but the diagram shut off and the main gas stop. the millivolt drop when burner on (the thermostat on moment),millvolt back around 750 (the thermostat off), is this related?

@NOBOX7 5 лет назад

Thanks brother

@grayfurnaceman 5 лет назад

Welcome GFM

@NavidEstrada 12 лет назад

Hello, what are the 4 functions of that combination gas valve, if you would be so kind????

@cholin846 3 года назад

impecable 10 puntos

@ripj5301 4 года назад

I can’t figure this out anywhere. I’m using a patio heater with the Shaw pilot knob. I have been looking for an explanation as to how the knob assembly works. It’s supposed to turn easily from off to pilot, then you must press down to light the pilot and then it will continue to the full on position. You can manually hold the pilot knob down and turn it to on to ignite the burner of the thermocouple doesn’t work (it shuts off once you stop pushing the knob). I was fiddling with the knob and it seems as though it got reversed mechanically? Now I can’t turn it to the off position without pushing down on the knob, but it will turn right from off to on without pressing down. (The opposite of the proper mechanism behavior) I was trying to learn how that mechanism works to fix it but that wasn’t discussed here (or anywhere) have you heard of this happening?

@grayfurnaceman 4 года назад

I probably cannot be of help here. The only thing I know is that if the knob gets stiff, you are pretty much stuck with replacing the valve. GFM

@tonytony6912 2 года назад

Do you use a sealant when putting the valve back together? I opened an old valve to a wall heater and freed up the stuck diaphragm. But didn't reuse because I didn't know if a sealant was needed?

@grayfurnaceman 2 года назад

Under no circumstances do I repair and reuse the combination gas valve. Its just not safe. This video is for explanation only. GFM

@Altitude3 6 лет назад

If you could answer my ? i would be extremely greatful. i have been battling my furnace trying to get it to work for months because my family is freezeing. I have a duotherm gravity gas furnace model 714072 in a mobile home with this same combination valve. The pilot always lights but recently it has been windy and causes the furnace to go out even once its on. I can still get the pilot lit but now it will blow out before the furnace ever comes on. Inside the flame is heating but flickers alot until it goes out but it is no longer windy and i am stuck. I work on home appliances so i am handy but i am not sure what to do here. When i opened the pilot light window case it had a side of metal where i believe the burner lines go, the gas line in the middle but the other side (right side) is wide open with a similar piece of metal as the other side lying on the bottom. Ive tried propping it up like the other side because they are very similarly shaped but it still did not work. I would greatly appreciate some advice

@armandom.5299 5 лет назад

Call a pro

@mrstory6224 2 года назад

I have a garage furnace with a White Rodgers combo valve. The TC is making over 25mV. I think I have a bad TC connection to the solenoid, open solenoid coil or stuck solenoid. Is it possible to test the pilot solenoid coil resistance with the TC disconnected? Black meter lead to valve body and red to the solenoid connection? Thanks if you can help

@grayfurnaceman 2 года назад

What happens when the button is released? Pilot goes out? Stays lit? GFM

@francom6230 6 лет назад

Yup... You explained that beautifully. I hate New electronic ones.

@Freeze380 6 лет назад

This is exactly the system I have and even thought the thermal coupler was changed heater won’t stay ton for long time . I’ll hear a click and pilot is out. I can relight pilot light but when I turn to gas it goes out what to do ?

@grayfurnaceman 6 лет назад

The reasons for that type of failure are numerous. Is the pilot covering the thermocouple at least 3/8"? Is there any draft hood spillage? Is the thermocouple tightened reasonably? GFM

@cecilioesparza7368 3 года назад

My do some, whit red flame why?

@semuada 9 лет назад

Thanks for the video. My problem is the flame goes out after I let go of the knob (after successful ignition), so I suppose is the thermocouple's fault.

@grayfurnaceman 9 лет назад

SS Lee If the pilot flame is blue and covering the thermocouple, you probably have a bad thermocouple. GFM

@MrVisions 7 лет назад

Hi GFM, thanks for your very informative videos. I have to replace the gas valve on my old 1970's Lear Siegler mobile home furnace, and coincidentally it looks almost identical to the one you are working on here, except for where the adjustment screw is, mine has a selector for either LP or Nat. gas. My question is, where do you find the model number? mine only has an inked stamp that looks like a serial number. Can you still get a replacement for one of these? Or can you use a universal one? My furnace is a mid seventies Lear Siegler AGC-80 Type B furnace. Thanks beforehand for any help you can offer.

@grayfurnaceman 7 лет назад

If it is a standing pilot, most any of the general replacement valves will do. The biggest concern may be the piping locations. Check with White Rodgers or Honeywell. Hope this helps. GFM

@MrVisions 7 лет назад

Thanks

@kien905 7 лет назад

does the thermostat also control the gas valve? is there another valve somewhere in there control the gas to the burner?

@grayfurnaceman 7 лет назад

This depends on the age, make and model of the unit. Some very old units have the gas valves directly controlled by the thermostat. Newer ones are controlled by the control board which is then controlled by the thermostat. GFM

@thehorrifyinggamer5460 7 месяцев назад

Hi, is there a way to get a replacement solenoid for a gas valve?

@grayfurnaceman 7 месяцев назад

No. The valve parts are not replaceable. GFM

@path2049 Год назад

I have an old furnace. I tried to use this a few days ago. I turned the heater on via thermostat, and no warm air came out of the vent (but the fan was turning). I checked the pilot light and it was off. I re-lightened it (meaning gas was there). I turned the heater on again, with the same result. I checked the gas valve, TR and TH, 27V AC was there. Any suggestions?

@grayfurnaceman Год назад

Using your info, the gas valve has failed. GFM

@barbedstar6480 4 года назад

Have old Warm Morning heater that I love. It has fan that is not used. It has the same on/off/pilot valve as pictured. Tan, push down for pilot turn to on when It has started. Easy to start. It periodically starts roaring when running, nothing consistent. From quiet to softish steady roar. I jump up, turn it to low and it often stops the roar and I quickly turn it back up and it works fine with roar gone. One time I had to turn off the gas at the pipe and right back on when just turning it down did not stop it. Since there is no motor running - just the gas coming through the lines... is it air coming through with the propane? Sound old tank is half full. Old regulator? Smell no leaks. Went through a spat of this happening around 4 am on cold mornings, but that seems to have quit. Out of the blue, it just did it again this (cold outside) evening. Help!!! No one seems to know what I am talking about. Thank for any help.

@BigALNYC04 5 лет назад

I have a head scratcher. I smell gas when my boiler lights up and it takes longer (30sec) to ignite than before. Weil Mclain boiler, steam over gas system. Lit pilot. Has a robertshaw 7000erhc-s7c vale. Says it has slow opening feature for soft ignition. Any ideas before I replace the valve? Looks like the one in your vid. No complaints otherwise and everything looks visually good. Thanks for good vids.

@grayfurnaceman 5 лет назад

First, I would try cleaning the burners. GFM

@mr.q7455 3 года назад

Thanks for the video. What do you recommended if the knob will not turn while pressing down? Could it be grease caught in the valve (deep fat fryer). Thanks!

@grayfurnaceman 3 года назад

Actually, grease should make it easier to turn. These valves are designed so that the knob will break off if it gets too stiff to turn. Replace the valve. GFM

@mr.q7455 3 года назад

Ok thank you!!

@Depsoom 7 лет назад

I have a Superior direct vent gas fireplace, model # dt-600cmn. The pilot stays lit but go off whenever I turn the knob at the gas valve from Pilot to On. Thermopile reading is 374 to 380 millivolt, while the thermopile is reading about 80 millivolt. I unplugged both thermopile and thermocouple wires from the gas value but the pilot light still go off immediately when I turn the gas value to the On position. I would greatly appreciate if you can suggestion what else I can test to isolate where the problem is.

@grayfurnaceman 7 лет назад

Open circuit voltage should 500 mv. Closed circuit should be 125 mv. You are a bit low. Is the flame blue and covering the thermopile? Are the connection tight? GFM

@SS-br1kc 5 месяцев назад

I have this gas valve but with an ignition system pfg8. Keeps cutting on an off can it be the valve ? Should I change the pilot solenoid first ?

@grayfurnaceman 5 месяцев назад

The pilot solenoid is not replaceable on the gas valve. If the pilot safety was opening, it would not relight. I would be looking at the low voltage controls such as the thermostat or limit switch. GFM

@joseerivera5015 4 года назад

Help! I have standing flame furnace with a 36c53-418 gas valve. The pilot keeps going out after 1-2 hours. I've changed thermocouple and high temp sensor. There is no flame roll-out. Earlier today I reignited the pilot, set gas valve to on, thermostat clicked and burners roared and fan forced air... the thermostat reached temp and burners shut down but noticed a flame sputter at base of burner tubes (where they meet perpendicular to gas tube going into furnace chamber) leading into furnace - pilot remained lit. I raised the temp on thermostat and furnace went on normally and again sputtering at base of tubes leading into furnace when thermostat reached temp - pilot still lit ( nice fanned flame hitting thermocouple). On the 3rd sequence the thermostat sent signal for heat and boom like a backfire the pilot went out and I can hear the gas hissing. Shut off furnace and gas line. Can this be a faulty gas valve 36c53-418. Cold n almost blowup in NJ

@grayfurnaceman 4 года назад

The first thing I would do is clean and readjust burners. GFM

@mark.r8900 Год назад

Hi, i hear a clicking sound from gas valve when thermostat calls for heat. But the pilot is off. Does this clicking sound means that the gas valve is being energized and gas is going to burner even though the pilot is off? Thanks

@grayfurnaceman Год назад

The pilot safety valve is in series with the main gas valve. If either valve is closed, gas will not flow, either to the pilot or the main gas in virtually all gas valves. GFM