Questions tagged [transformer]

For questions about transformers, devices which convert alternating current from one voltage to another.

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1answer
1k views

Doorbell dings, dongs, but doesn't ding-dong

I'm replacing a doorbell chime unit. The old one worked, but the new one does not. If I connect the wire to the terminal labeled "front", it will ding. If I connect the wire to the terminal labeled ...
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2answers
637 views

Ring Doorbell w/ Digital Chime

I purchased a ring doorbell 2 for my sister for Christmas. I am pretty tech savvy and offered to install it for her last night. I went through the instructions several times but I was not able to get ...
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2answers
56 views

GFCI burned out during low transformer outage

About a year ago, we had a large low transformer fire on our block in Brooklyn, NY. That's according to ConEd response team. Before and during the fire which lasted few hours, voltage has been ...
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1answer
1k views

Is this my doorbell transformer?

Is this the transformer for my doorbell? It is located in the furnace room, but it looks like it is connected to the furnace. I am just wondering because I have been searching for the transformer and ...
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1answer
87 views

Why are leads of primary and secondary plugs in step down transformer shorted?

In the image above, one of the leads in the primary plug of the 220v-110v step-down transformer has continuity with all the leads in the secondary outlet lead using a tester (see arrow in blue). I'm ...
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2answers
613 views

Electric Garage heater contactor failure

I own a Fahrenheat FUH724 (7500 watts) electric heater for my 2 car, uninsulated garage. I installed this unit 12/2017 along with a Nest thermostat. An Aube rc840t-240 relay was used to step down the ...
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0answers
250 views

Extremely old doorbell transformer filled with black gunk?

I need to replace my doorbell transformer in order for my Ring video doorbell to consistently have sufficient power. After searching long and hard I finally located the transformer, which appears to ...
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1answer
216 views

Furnace getting power, but heat/AC not kicking on. LED on board is not lighting up. Thinking the transformer is gone

So far I've been successful in maintaining and repairing my own HVAC system in my house. First week we bought the house (we knew going into the purchase) I replaced the main board. It's been golden ...
1
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4answers
92 views

Would a transformer protect a 24V digital flow meter if it received 48V?

I purchased a new water softener for the house. It has a digital flow metering device. It worked great for a few days and then stopped working. Long story short, I finally figured out that the outlet ...
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2answers
142 views

Do they make 24v transformers that have individual terminals for up to 4 thermostats? [closed]

I have two ecobee 3 thermostats sharing a 24v transformer. I'm about to buy two more. Do they make 24v transformers that have separate pairs of terminals for each thermostat? This is not a question (...
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1answer
1k views

What is that burning smell in transformer?

When I plugged in a 250VA load to the left transformer. I can smell something burning and the case is super hot. What causes the burning smell? What part of transformer can produce burning smell? ...
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1answer
93 views

Temperature Increase of Sealed Enclosure

I have a sealed metal enclosure of size 20inches x 13 inches x12 inches. A 500W isolated transformer with about half the load producing constant 51 Celsius will be put inside. How do you compute ...
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1answer
214 views

How Hot is your Transformer?

I got this Hammond 500VA Isolated Transformer. It's 500W capacity.. and I'm only using 30W. How come the temperature already reaches 50 Celsius (122 Fahrenheit)? How about you? What temperature did ...
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3answers
5k views

Mounting 24v transformer?

I bought a standard 24v transformer and attached a plug to one end so I can plug it into a standard outlet. Can I just mount it to the wall by the outlet? Should I leave some space between the back ...
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1answer
1k views

Doorbell Wiring Problem

I live in a very old house. Up until recently, my doorbell worked fine, but at some point in the last couple months it stopped working. At the transformer, I see ~18V, so that appears to be ok, but it ...
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1answer
86 views

Stepping up 240v to higher voltage.

My ac system is 240V. I want to step it up to higher voltage to plug in some temporary equipment that needs at least 400-440 volts. If I use a 120v-240v step up transformer.. would it make my 240V ...
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2answers
68 views

Lifetime of an autotransformer

In your experience (and in the literature), how many years is the lifetime of typical step-down autotransformer before the primary winding shorts and the full voltage of the primary gets to the ...
1
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3answers
242 views

Using 230V-115V Transformer for 240V supply

What would happen if your ac power system uses 240V and you are using a 230V-115V step down transformer? Would it degrade the winding faster? Why is there a 230V-115V ac? what countries use it?
1
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1answer
40 views

Transformer core size and breaker size

Without an isolation (or step down) transformer. Your 20 ampere circuit breaker can happily trip when oven hot wires touches ground by using proper hot, neutral and grounding wire sizes. No problem ...
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2answers
214 views

Cables in attic with no power

There is one cable with exposed wires. A voltage tester does not detect anything. Another cable goes into a junction box for the doorbell transformer. The cable in the junction box also has no power. ...
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1answer
307 views

Is this a doorbell transformer? How to test if faulty?

My doorbell has stopped working. I am trying to test each of the components using a multi-meter. However, the wires seem to go through the ceiling etc, so I can't trace where they are going or what ...
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0answers
32 views

Box mounting point

What are the chances of this setup passing an inspection? 4x4 box is mounted on a stud, relay attached to the bottom 1/2 knockout, transformer will be mounted at the front of the box. This is in ...
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1answer
382 views

Transformer location

I've got a very basic question - I have a 120V to 24V transformer https://www.functionaldevices.com/products/building-automation/details/TR40VA040/ and on the transformer surface it calls out "install ...
2
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1answer
793 views

Changing old doorbell transformer

I'm replacing an old doorbell transformer. After removing the junction box, I have 3 exposed black wires. I have the new transformer with the typical White, Black, Green wiring, but I don't know which ...
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2answers
3k views

Doorbell Voltage Drops at Transformer

All, I replaced my doorbell transformer and got 22V (which was odd since it is supposedly a 16V transformer) with no wires connected to the transformer. As soon as I connect the wires to the ...
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0answers
450 views

Doorbell button wire low or no voltage

I have existing wiring for my doorbell that goes from the front door to a closet. No actual doorbell or chime is hooked up, just wiring. When I connect a 24v transformer to the closet end, I'm ...
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2answers
275 views

208x240 buck boost transformer putting out ~260v

I recently installed a buck-boost transformer in one of our buildings with 208Y/120v service to support a 1hp submersible well-pump rated for 230v single-phase. The transformer is a GE 9T51B0158 ...
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1answer
125 views

How can I ground an appliance with a CEE 7/7 plug plugged into a step-up transformer with a “universal” female outlet?

I'd like to use a European appliance (5A 208-240V 50/60Hz 900W) with a step-up transformer such as this one. The appliance has a CEE 7/7 Schuko-French hybrid plug. The transformer has a female ...
2
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2answers
272 views

Is it safe to remove this wall transformer?

I bought a house a bit ago and it came with this plugged into one of the walls. I'd like to remove it as I don't know what it does or if I need it and when thunder strikes the thing makes a noise like ...
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0answers
29 views

How well will a machine rated for 120 volts 60 hz work with 120 volts 50 hz?

Moving oversea wanting to know how well my Zaaz Vibration Platform Fitness Machine will work with a transformer that will step down 220 volts to 120 volts with 50hz?
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1answer
86 views

can i use a transformer to run an american steam cleaner ( 120v/60hz) on a 220v/50hz

i recently purchased a steam cleaner ( sienna Luna plus) willing to use it in Algeria, but it is designed to be used in the US , the only way i found to transform 220 v 50 hz to 110 v ( i think ...
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2answers
185 views

What is this unit attached to my house, and what do I replace it with?

I am trying to figure out what this thing is. I assumed it's a bell ring transformer but then it has four terminals on it. Any help is appreciated!
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2answers
2k views

Can 1 24v transformer support 2 smart thermostats.

I replaced my old thermostat with a lyric. My doorbell transformed was unused and 16 V. I replaced that with a 24 and wired it directly to my lyric. Everything works great. If I do an additional ...
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0answers
26 views

a non working single 10W MR16 in a recessed light (LED)

One of the bulbs is not lighting up. I tried a new bulb and replaced the ceramic bulb holder and that did not help. What am I missing? Could it be a transformer that suddenly went bad? If that is the ...
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0answers
2k views

Fixing constant humming from mechanical doorbell with video doorbell ringers (ring/skybell)

We have an old house with a neat mechanical doorbell. The bell is one of the hammer/bell kinds. I've installed 2 video doorbells which have been powered by this just fine. I tried to add a 3rd but ...
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2answers
532 views

Will transformer operate a door bell/chime 200ft away?

I want to install a doorbell with two bells and one button so it can be heard in two places. One location is within 25ft of the button. The other is about 200ft from the button. Will the transformer ...
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2answers
171 views

How can I measure the voltage of 40A transformer?

I need to power 10 meters of 5V LED strip, for which I bought a 40A transformer on AliExpress. Now, as much as I believe that cheap stuff bought from China can be okay quality, I'd like to make sure ...
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4answers
575 views

Wiring 24V foot mount transformer

I'm adding a 24V transformer for a powered damper for my HRV, which will run independently of the furnace. I picked up a suitable transformer, except it's foot mount and I only just learned I ...
1
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1answer
443 views

Is the control wiring for my boiler reversed?

I've been diagramming my boiler wiring so that I can understand it before installing a Tekmar 256 external reset. What's been throwing me for a loop is that it looks as if the 24v common is being fed ...
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1answer
766 views

Can I buy a 24v transformer with a dedicated common c-wire feed?

I have an oil furnace that feeds hot water to baseboard in four zones in my house and also to a hot water tank for tap water. There is a 24vac transformer with two output wires that feed power to the ...
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0answers
108 views

Does anyone know what this transformer block is for?

I have just moved into a new flat and mounted on the wall outside the bathroom is a white box. Inside the white box is a transformer and a circuit board. Can anyone help me identify what the purpose ...
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1answer
60 views

HVAC system electric diagram help

I am trying to revive an old three phase 5HP HVAC system so I took a look at the 25 years old electrical system digram and came across 3 three sections which I could not understand completely (I am ...
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1answer
2k views

Why is my control panel for AC/Furnace not working when the fuse is ok?

So a few weeks ago I replaced my thermostat with an ecobee3 smart thermostat. In the process of wiring the thermostat I blew the 3A fuse up in the attic and had to replace the fuse. The thermostat ...
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2answers
668 views

Why does my photo sensor activate during the day?

Our home has a Malibu 300 watt transformer for landscape lights. The lights are on during the day. I have checked the photo sensor and have replaced it but the lights keep coming on regardless of ...
2
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1answer
76 views

Can I convert a 12 volt DC device that uses a 240v transformer, back to 12 volt?

I have a small snack bar/kitchen trailer that I need to convert partly to 12 volt. There is a 12 volt dc water pump 5.2amp and an LED strip light 12volt 5.2 amp - both of these devices currently have ...
2
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1answer
3k views

Can I use a separate 24V transformer with an Ecobee 3 and an Aube relay?

I've purchased an Ecobee 3 Lite smart thermostat which requires 3.5 VA to operate but I'm using an Aube RC840T-240 electric heating relay with 24 V transformer which only provides 1.2 VA. Can I ...
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1answer
4k views

Bathroom light not working but extractor fan is

My bathroom light is not working but the extractor fan via the same cord fitting is. I replaced the cord fitting and checked there's current running through both wires when it is turned on. I then ...
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0answers
810 views

Replaced HVAC Transformer, still have no output voltage

My HVAC stopped working, no matter what state the thermostat is in there is no fan, no compressor, no heat, etc. Using a multimeter, I found that the output voltage on the transformer was 0V. ...
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1answer
2k views

Hook up a light designed for car into a wall socket or battery source [closed]

I'm attempting to hook up the Infrared LED LED Light Bar - 54W to either a wall socket or a battery source. I'd like to know what hardware and what wiring I need to accomplish this. Any embelishment ...
0
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1answer
668 views

How to connect transformer to outlet for humidifier

I purchased an aprilaire 700, and I plan to install a 15a electrical outlet on the furnace right where the electrical comes in. If I first feed hot wire to outlet, and then feed off outlet to furnace, ...