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If board is sending signal to valve but no gas coming out you either have a gas pressure issue or a bad valve.Make sure the switch on gas valve is ON position and gas cock is turned inline with gas pipe.
I am showing the VAL09029.
I like to check gas pressure first but would require a manometer or gas pressure gauge to do so. This particular valve is one of the less expensive valves, so unless you have one of the meters, may be cheaper to just replace the valve.
Not sure about the 7731.It may be an upgrade. But either valve should come with an instruction sheet and you can also come back here for guidance if you need help replacing.
Based on the info I have, the 9028 should be correct. The other valve may have been a previous replacement. Let me know if you need help and how it goes.
The pressure should be preset at factory.he natural gas furnace operates at 3.5" water column.Although it is adjustable you should not need to mess with this.This is done by removing a cap screw and loosening or tightening a screw which compresses or decompresses a spring, but again, you should NOT have to do this for the gas furnace you have.
It will only make the flame too low or too high.If you adjust too low, you may not get enough gas out to allow burners to touch flame sensor.If too high, flame may roll out tripping limit switch.
Personally I would not adjust as I do not feel this is going to have any effect on your issue since you are getting no gas through valve.
The Inlet pressure does effect the opening of the valve. If you had low inlet pressure, it may not be enough to actuate the diapraghm in the valve. That goes back to my saying I like to check with a manometer to verify gas in and out of valve before replacing.
The adjustment you are referring to is on the outlet side of valve.It adjusts where we send 2 to 5" of pressure out of valve, but will have no effect on how much pressure is coming in.
And as a rule you will hear the valve click when applying 24 volts. If you do not, the solenoid on the valve is most likely bad which means you would replace the valve as solenoid is considered part of the valve, not normally field replaced.
OK lets back up a minute an cover eveything again.
1. The gas valve should open as long as we have between 5"WC and 7.5" incoming gas pressure and we are getting 24 volts to the solenoid.
2.I like to check and make sure we have sufficient supply pressure to the valve before replacing.
3. If we are getting 24v to the solenoid you should here it click
4.Since you have stated that we are getting24v to the valve and we have no reason to suspect the gas pressure in is low, I would replace the valve.
5. No you can not check "OUT" pressure unless we get valve to open
Either valve should work on your furnace the current parts list I have is recommending the valve I told you to get. The VAL09029.
The 09029 can be used with either spark ignition or hot surface ignition. The 4858 is designed just for the hot surface ignition.
Either should work fine since you have hot surface
Istall the new valve and let's get some heat going.Let me know how it goes.
OK there will not be step by step instructions as they intend on a trained technician to be doing, but it is pretty simple.You will just remove the wire, disconnect the supply line and unscrew the valve from the manifold bar. I am going to attach you a generic video.Not exactly like your furnace but will give you the idea.
I am in Southern Alabama so would not be familiar with who to recommend there. My suggestion would be to go to Trane website and enter your zip code to find the nearest dealer.
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Position of the valve can be installed on an angle,That will not effect operation, but we realy don't want ot touching the doo and vibrating.
I personally would agree with you yes, but as a technician, I can only provide information as approved and recommended by the manufacturer.I have always said, I thing designing engineers should have to spend time in the field seeing how these things work in real life situations.I do not see you having any problems using the vale as long as you were able to get panel in place by removing the part, but yes ,it should not be necessary.
One of my most reliable source ,(Repair Clinic)shows the VAL09029 as the Trane OEM number
When searching for valve for furnace, Keith Specialty shoes the VAL09029
Shorty's shows same valve when searching my furnace model
Midwest Parts also shows same valve
Not sure why all of these would recommend it as correct replacement as they get their recommendations directly from Trane who manufactured your furnace.
I understand the frustration and would possibly consider contacting the source you purchased itt from if they also recommended . This is rare that such an issue arises to have several sources tell us the same valve and it be wrong. I can request a refund of your deposit if you are not satisfied with the service,and my apologies, but again I am relying on these sources which are usually very accurate.
No problem at all, We want your complete satisfaction,Sorry for the problems.
I have forwarded to administrators requesting refund.Thanks again