I believe what you were seeing was voltage back fed from a snubber circuit in the board. Ghost voltage is usually just a few volts or millivolts. You will see a lot of transient voltages in commercial with the higher primary voltage and multiple circuits ran in the same conduit. Snubber circuits will measure the full voltage but when loaded up, will vanish. A snubber is connected in parallel around the switching points so that is why you will measure the full control voltage even when the output is not switched on. They are there to protect against transient voltage and spikes and they will lead you on a wild goose chase. Trane had a seminar years ago warning technicians about snubbers and misdiagnoses.
@@myHVAClife that's right, you want to measure for voltage while connected to the load device, that way the snubber is drained of that apparent voltage.
I Always hit like on your videos before I even watch it, I’ve learned so much from your videos, keep them coming. Just wanna thank you and wish you a Merry Christmas 🎉
Did you measure the 24v circuit under load? A bad connection somewhere (connection, thermostat) can drop voltage under load and not allow the relays to energize.
pull the thermostat, isolate the control wires, and check for cross talk between W1 and W2 on the thermostat wires. IF there is nothing apply 28v from the R to each wire and measure for any ghost voltages to isolate the control wire as the issue. if you are concerned with ghost voltage use the spare wires as drain and wire them all to the common, that will aid in giving the stray voltages a source to drain too.
Sorry about my rant about dip switches charles from the gree flex stuff I understand they were trying to explain what thier funtions were but it sounded like overly complicated mumbo jumbo that could lead a tech down a rabbit hole. They are set at those defaults for a reason. Like at the 3 ton or 5 ton defaults and standard defrost. Those do not need to be messed with blower fan setting speeds yes like jake porter went over in one of his videos. Hopefully you can do a video on that. With a trane or whatever product you feel like. The other thing that troubled me was they were overcomplicating the heat kits or heatcstrips they are, simple VS most heat kits with a simple plug harness no need to go into the old way or whatever. It's like the old saying Charles keep it simple stubid. Merry Christmas.
So, is the board actually bad, or is it the thermostat not energizing the second stage properly, resulting in the ghost voltage (e.g. the solid-state device that's supposed to drop to close to 0 ohms is actually only dropping to something much higher (a few hundred, perhaps) that puts a voltage on the line, but not enough current to do its job? Of course that doesn't explain why the board is dropping out...
Nice video charles keep those tranes stockpiled in the shop that so you have parts even if you at a certain point can't install those 410a any longer and I hope you are stockpiling 410a also before the prices go way up. Anyway maybe you can do videos on how to properly set fan blower speeds for proper balance between return and supply and calculating properly return supply ductwork. As today I watched a gree flex training video in my you tube feed but those guys were going over the condenser dip switch settings between the condenser but to me you should leave the tonnage at the factory default settings which is for 3 ton sytems the 3 ton system settimg same for 5 ton version the only thing you should be changing on those units is the blower fan speed of needed. As those units with the inverter technology are going to adjust the tonage automatically with the ramping up and down and fan speeds so why limit it. Happy Holladays charies and learning more.
So the ghost voltage was being generated by the original board? I've seen that issue on a Liebert unit once when the electrician ran control wires in same conduit with 480 power wires, but it was only millivolts. It was enough to give false signal to board from sensor for high pressure. They finally believed me when the tech support guy confirmed my suspicions.
I wouldn't sell a 2 stage 40,000 btu furnace not worth staging 40k btu's. The 2 stage is not going to save any gas, it just inflates the replacement parts costs.
I believe what you were seeing was voltage back fed from a snubber circuit in the board. Ghost voltage is usually just a few volts or millivolts. You will see a lot of transient voltages in commercial with the higher primary voltage and multiple circuits ran in the same conduit. Snubber circuits will measure the full voltage but when loaded up, will vanish. A snubber is connected in parallel around the switching points so that is why you will measure the full control voltage even when the output is not switched on. They are there to protect against transient voltage and spikes and they will lead you on a wild goose chase. Trane had a seminar years ago warning technicians about snubbers and misdiagnoses.
That's great info.
If you get the voltage to the wire connect back to the load and you will get zero
@@myHVAClife that's right, you want to measure for voltage while connected to the load device, that way the snubber is drained of that apparent voltage.
The comments here are right on the money... transient voltage is so common on large control panels.
I Always hit like on your videos before I even watch it, I’ve learned so much from your videos, keep them coming. Just wanna thank you and wish you a Merry Christmas 🎉
You are welcome! Glad you enjoy them.
Thanks for the video. Stay safe out there.
HOPE YOU AND YOUR FAMILY HAVE A MERRY CHRISTMAS/
@@myHVAClife You as well bud.
Did you measure the 24v circuit under load? A bad connection somewhere (connection, thermostat) can drop voltage under load and not allow the relays to energize.
pull the thermostat, isolate the control wires, and check for cross talk between W1 and W2 on the thermostat wires. IF there is nothing apply 28v from the R to each wire and measure for any ghost voltages to isolate the control wire as the issue. if you are concerned with ghost voltage use the spare wires as drain and wire them all to the common, that will aid in giving the stray voltages a source to drain too.
I'll add that to my troubleshooting list!
Thanks for the video 👍🇺🇸
You’re welcome!
Sorry about my rant about dip switches charles from the gree flex stuff I understand they were trying to explain what thier funtions were but it sounded like overly complicated mumbo jumbo that could lead a tech down a rabbit hole. They are set at those defaults for a reason.
Like at the 3 ton or 5 ton defaults and standard defrost.
Those do not need to be messed with blower fan setting speeds yes like jake porter went over in one of his videos.
Hopefully you can do a video on that. With a trane or whatever product you feel like.
The other thing that troubled me was they were overcomplicating the heat kits or heatcstrips they are, simple VS most heat kits with a simple plug harness no need to go into the old way or whatever.
It's like the old saying Charles keep it simple stubid.
Merry Christmas.
So, is the board actually bad, or is it the thermostat not energizing the second stage properly, resulting in the ghost voltage (e.g. the solid-state device that's supposed to drop to close to 0 ohms is actually only dropping to something much higher (a few hundred, perhaps) that puts a voltage on the line, but not enough current to do its job? Of course that doesn't explain why the board is dropping out...
Nice video charles keep those tranes stockpiled in the shop that so you have parts even if you at a certain point can't install those 410a any longer and I hope you are stockpiling 410a also before the prices go way up.
Anyway maybe you can do videos on how to properly set fan blower speeds for proper balance between return and supply and calculating properly return supply ductwork.
As today I watched a gree flex training video in my you tube feed but those guys were going over the condenser dip switch settings between the condenser but to me you should leave the tonnage at the factory default settings which is for 3 ton sytems the 3 ton system settimg same for 5 ton version the only thing you should be changing on those units is the blower fan speed of needed.
As those units with the inverter technology are going to adjust the tonage automatically with the ramping up and down and fan speeds so why limit it.
Happy Holladays charies and learning more.
Merry Christmas
So the ghost voltage was being generated by the original board? I've seen that issue on a Liebert unit once when the electrician ran control wires in same conduit with 480 power wires, but it was only millivolts. It was enough to give false signal to board from sensor for high pressure. They finally believed me when the tech support guy confirmed my suspicions.
I wouldn't sell a 2 stage 40,000 btu furnace not worth staging 40k btu's. The 2 stage is not going to save any gas, it just inflates the replacement parts costs.
For real
It is a 60k