Yueqing Yijin Electronics Co., Ltd.
The missing 24 V is not on this sheet
Not getting 24v to ac contactor is the reading people report when an HVAC coil stays open. The YJC1-63 page answers with 230 V.
The sheet does not print 24 V. The path that should have carried 24 V is a different object.
Missing control voltage is a path question
The useful first picture is two small control wires and a call for cool. The missing number lives on that path. The product sheet lives on another page.
From the field: On a Do-It-Yourself cooling thread, a reply said you should have the control volt between the two smaller wires going to the contactor when the thermostat is calling for cool.
Source: DoItYourself.com cooling-thread extract.
If those two wires are dark, stop before you blame the household frame. The path failed first. The sheet never promised to invent that path.
| What you brought | What can answer it |
|---|---|
| No 24 V on two small wires | A control-path check |
| A 230 V household spare | The printed working voltage |
| A buzz in the cabinet | A different page |
The coil family can be 24 V
A contactor is a type of relay with a high power rating. The class is wider than one printed voltage.
Coil voltages for contactors are often from 24 V AC/DC all the way up to 600 V AC. That sentence is about the family. It is not a line on the YJC1-63 sheet.
An outdoor condenser coil in that family can sit at the low end. A household module can sit at the printed end. Mixing the two into one spare is how a missing control volt gets blamed on the wrong body.
This sheet prints the household voltage
Life and close bands only belong next to the voltage the page describes. An HVAC coil from the low end of the class is not this spare, even if both click.
The YJC1-63 page prints a rated working voltage of 230 V at 50 Hz or 60 Hz and a rated working current of 63 A. The page says the product complies with GB17885 and IEC1095.
It names low-inductance loads and household motor loads. Conventional units are normally open. A normally closed unit is described as a custom build.
A household motor on that voltage is inside the story. A low-voltage coil without a matching sheet is outside it. The printed working voltage does not travel to the two small HVAC wires.
The page says the contactor can close at any voltage from 80% to 110% of the rated control supply. The page says the release voltage is neither higher than 75% of that supply nor lower than 20% of that supply.
Those lines are the control supply band for this body. They are not a 24 V promise.
A transformer is another part
A transformer is a passive component that transfers electrical energy from one electrical circuit to another circuit. It can change AC voltage levels. It is not the contactor.
If the control volt is missing before the two small wires, look at that source. The household sheet still only prints the working voltage above.
A transformer that sagged under a call is a source problem. A contactor that never saw the control volt is a path problem. Neither problem rewrites the printed working voltage.
A buzz is not a missing volt
Noise is a field complaint. A missing 24 V is a path reading. They can appear on the same afternoon and still answer different questions.
A later comment on the contactor talk page says contactors and large relays may hum or buzz when they are energized with AC power. That remark needs a coil that is already energized. It does not explain a dark pair of small wires.
Keep the buzz on the symptom page when you need that conversation. Keep this page for the missing-volt path.
The rail still only holds the body
A DIN rail is a metal rail of a standard type widely used for mounting circuit breakers and industrial control equipment inside equipment racks. The page names the TH35-7.5 rail.
The rail holds the body. It does not store 24 V.
A loose clip can rattle. Seat the clip before you treat the noise as a missing volt.
The altitude note says the installation is not over 2000 m. That line is a place limit, not a 24 V limit.
A breaker is a different ending
Unlike a fuse, which interrupts once and then must be replaced, a circuit breaker can be reset to resume normal operation. A contactor is a remote switch. It is not that reset.
A relay is an electrically operated switch. The contactor page is the high-rating case.
When the question is only “not getting 24 V,” stay with the path and the printed 230 V. When the question is a trip on overcurrent, open a breaker page instead.
The YJC1-63 modular AC contactor is the sheet with that working-voltage line. The contactor hub collects the other frames if the pole count is different.
| Printed line | How to use it |
|---|---|
| 230 V working voltage | Match the household load, not a 24 V coil |
| Close band | 80% to 110% of Us on this body |
| Release band | 20% to 75% of Us on this body |
Before you order an HVAC spare from this page, write two lines. Line one is the two small wires. Line two is the printed working voltage.
If line one is the job, stop. This sheet is the wrong body.
Say who measured the 24 V and where the cabinet is. An outdoor condenser and a household rail board can both click, and they are not the same spare.
Read the request aloud. You want the control path, then the printed working voltage, then the load. A request that only names the missing volt will come back as a guess if the body is unnamed.
Keep a spare note for the person who opens the cabinet next. Write the frame, the pole count, and whether the unit is the normal open build.
A custom closed unit is a different order, and the page says so. The missing 24 V still does not choose between them.
If the motor is a household load on the printed working voltage, stay with this sheet after the path is known. If the motor is an outdoor low-voltage coil, change the family.
A stores person can stock the household frame without inventing a low-voltage coil from the class range. Ask for the printed working voltage first. Leave the HVAC control volt on its own note.
Write the duty beside the voltage. A household pump on the printed working voltage is inside this story. A condenser that only ever saw the low control volt is not.
The sheet still only prints the working voltage. Your note has to carry the path.
If you already replaced a buzzing unit last season, do not reuse that story as a 24 V reading. The buzz page and this page stay separate.
One talks about noise. One talks about a missing control volt.
A buyer who only wants the control volt will push for one number. Answer with the two small wires first. Then read the printed working voltage.
Only after both are on the note should anyone open the YJC1-63 carton for that job.
A second person should find the rail without walking to the outdoor unit. Name the room and the board. If the only instruction is the missing control volt, that person will look for a condenser and miss the household frame.
Keep the HVAC family on its own shelf note when the two small wires are the only story anyone brought. This page is the household-voltage conversation.
The class range still does not rewrite the printed working voltage. Ask for the sheet first. Then ask for the path.
Frequently asked questions
These answers stay with the pages opened for this draft.
What did the forum ask about the two smaller wires?
A reply said that when the thermostat is calling for cool you should have 24v between the two smaller wires going to the contactor. That is a path question.
What working voltage does the YJC1-63 page print?
The YJC1-63 page prints a rated working voltage of 230 V at 50 Hz or 60 Hz and a rated working current of 63 A.
Which close band does that page print?
The page says the contactor can close at any voltage from 80% to 110% of the rated control supply. The page says the release voltage is neither higher than 75% of that supply nor lower than 20% of that supply.
What coil range does the encyclopedia name?
Coil voltages for contactors are often from 24 V AC/DC all the way up to 600 V AC. That range is the class, not this sheet.
What does a transformer do?
A transformer is a passive component that transfers electrical energy from one electrical circuit to another circuit. It can change AC voltage levels.
Why is a buzz a different complaint?
A buzz needs a coil that is already energized. A missing 24 V is a dark path.
