Not with alternating current. When working with direct current the red lead is positive and black is negative. Direct current (DC) voltage is produced by batteries mainly.
@@AIRMANHVAC thanks! So when testing the transformer, you're just touching one of the probes (no matter which) to each of the 2ndary outputs and looking for a 24V reading? (I couldn't see from the video where you're attaching the other probe).
From Hammond transformer company. You must hook up the dual windings type transformer in phase or you will burn out the unit. In transformers with dual primaries and secondaries, do I need to hook up both? YES, The unit was designed to run both and if you use just one it will overheat and voltage regulation will be poor. In dual winding transformers, how do you hook windings up "IN PHASE"? To hook the windings in parallel, always hook the dot to the dot. To hook the windings in series, always hook the dot to no dot. This applies to primary and secondary windings.
Hi I’m a diy i checked my AC’s transformer i took it out from the air handler it doesn’t smell or look burn! And the multimeter bipped, does that mean it’s good? Do I still have to test it if its Getting proper voltage? Trying to fix my AC that won’t turn on . It’s a 35 yr old Bryant no fuse , no circuit board, it was working before until I bypassed the thermosthat, I must have stuck the other end of the jumperwire to a wrong one and it short circuited something. If it’s not the transformer , what will u suggest the next part I should check?
Hey Rick, assuming that you have a transformer that converts 120 Volt or 240 volt to 24 volts and the transformer is installed....first, you need to confirm that the correct voltage is being supplied to the transformer (either 120 or 240). Second, confirm that the transformer is generating 24 volts between your secondary wires (which is the wires that were hooked up to your thermostat wiring. If you have voltage coming in but not coming out, the transformer is bad.
Check the voltage coming out of the board.. if you have voltage coming out of the Transformer and you have it going into the board then most likely you don't have it coming out the board which would be a bad board
Whats odd is orig transformer was no 24v...i replaced and all was good for 3 days...then transformer catch on fire...and tripped gfci...main board fuse ok.
Hey Progress, that’s a great question. Unfortunately I don’t have a solid answer for you. All transformers are going to have different resistances based on voltages and their VA ratings. What I do when there’s no power is check the resistances across the secondary side and primary primary side of a new transformer that’s similar to what needs to be replaced and compare it to the transformer in question.
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Looks like you atrached the black multimeter probe to the yellow, rather than the red. Does it matter?
Not with alternating current.
When working with direct current the red lead is positive and black is negative. Direct current (DC) voltage is produced by batteries mainly.
@@AIRMANHVAC thanks! So when testing the transformer, you're just touching one of the probes (no matter which) to each of the 2ndary outputs and looking for a 24V reading? (I couldn't see from the video where you're attaching the other probe).
@@KeenaTurnerAndHooch correct
@@AIRMANHVAC thanks, bud.
From Hammond transformer company. You must hook up the dual windings
type transformer in phase or you will burn out the unit. In transformers
with dual primaries and secondaries, do I need to hook up both? YES,
The unit was designed to run both and if you use just one it will
overheat and voltage regulation will be poor. In dual winding
transformers, how do you hook windings up "IN PHASE"? To hook the
windings in parallel, always hook the dot to the dot. To hook the
windings in series, always hook the dot to no dot. This applies to
primary and secondary windings.
What would you consider to low of a voltage for a 24v Transformer?
Hi I’m a diy i checked my AC’s transformer i took it out from the air handler it doesn’t smell or look burn! And the multimeter bipped, does that mean it’s good? Do I still have to test it if its Getting proper voltage? Trying to fix my AC that won’t turn on . It’s a 35 yr old Bryant no fuse , no circuit board, it was working before until I bypassed the thermosthat, I must have stuck the other end of the jumperwire to a wrong one and it short circuited something. If it’s not the transformer , what will u suggest the next part I should check?
Hey Rick, assuming that you have a transformer that converts 120 Volt or 240 volt to 24 volts and the transformer is installed....first, you need to confirm that the correct voltage is being supplied to the transformer (either 120 or 240). Second, confirm that the transformer is generating 24 volts between your secondary wires (which is the wires that were hooked up to your thermostat wiring. If you have voltage coming in but not coming out, the transformer is bad.
It’s an old Bryant unit no circuit board no 3 amp fuse . If the transformer is good any suggestion what part you might think is causing the no start ?
Hey Rick, you get it figured out?
Check the voltage coming out of the board.. if you have voltage coming out of the Transformer and you have it going into the board then most likely you don't have it coming out the board which would be a bad board
Hi air ...whst could cause a gas furnace 24vac transformer to catch fire / mrlt on the 110v side ?
Probably a short to ground somewhere
Whats odd is orig transformer was no 24v...i replaced and all was good for 3 days...then transformer catch on fire...and tripped gfci...main board fuse ok.
The control board
it ended up being a bad neutral wire coming from the meter outside.
Good
How can you test the transformer with no power? Do I check continuity or resistance and what should the resistance be? Thanks in advance.
Hey Progress, that’s a great question. Unfortunately I don’t have a solid answer for you. All transformers are going to have different resistances based on voltages and their VA ratings. What I do when there’s no power is check the resistances across the secondary side and primary primary side of a new transformer that’s similar to what needs to be replaced and compare it to the transformer in question.
If you have a Milli ohm meter that's the way they are tested. It's measures very low ohms. It will also measure less than on ohm accurately.
how do you know the yellow is 24v ??
It is indicated on the transformer’s label that yellow is 24 volts.
Jesus …I fell asleep 5 seconds in