Need help reading this wiring diagram - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: August 28, 2018, 09:05:14 am
content: I have to figure out how to turn on my air conditioner from the unit located up in the attic. Unfortunately the owner of the house I live in has totally lost his mind and will turn the heat on instead of turning the air conditioner off lock his door and leave for the day. Yes there are people on this earth who are so stupid they don't understand how to use a thermostat at 60 years old. He also turns the light switch off on the wall to turn it off. It used to be every time he wanted the a/c or heat set he would ask me to do it. I almost feel bad for the guy since he more then likely has alzheimers but he lies cheats and steals every chance he gets. Anyways...This diagram is too small for me to read or when I zoom I lose track of what I'm looking for.I just need to locate a point where the thermostat comes into the attic unit or find a point where I can jump the wire inside the machine. Or know what color the wires are The attic is filled with the blow in insulation so everything is under a foot of it complicating things.Then when he's not home I will just turn on the a/c manually and unhook the wires when it cools off.Thanks in advance living here has turned into a real nightmare everyone moved out but me and one other so we are grateful!https://www.trane.com/Commercial/Uploads/Pdf/997/bcxc-svx01a-en%200902%20blower%20coil%20iom.pdf

author: Beamin
author_rank: Super Contributor
timestamp: August 28, 2018, 09:07:33 am
content: page 58 of the pdf its too large to upload.Or if I can find the wire coming from the therm which color wires to tie together to turn on the a/c?

author: Beamin
author_rank: Super Contributor
timestamp: August 28, 2018, 10:51:15 am
content: OK I found two wires they look like a bundle of wires so these must go to the therm it comes up from the floor of attic and goes into unit then an identicl wires comes out at te same sopt and is zip tied to a copper Freon pipe. This must be the wirethat goes to the outside fan/condenser to turn it on.So if I strip this bundle of wires open I should have access to the wires to control fan, a/c, heat. How or where on that diagram do you find which color does which? Also which of those configuration works for my AC I'm not seeing a correlation between my pics of the label on the side of the unit with the number of the unit in the diagram. But I might just not be able to see which one is which.If I'm measuring these wires out they will have 24VAC on them and I need to find a common ground to connect the fan or a/c wire to?To turn on the AC is there an a/c wire and a fan wire that are tied together in the mercury switch so I need to connect the a/c wire and the fan wire to get it to work?Or just a/c wire and the box in the attic is smart enough to turn the fan on too?Getting hot.

author: Beamin
author_rank: Super Contributor
timestamp: August 28, 2018, 11:16:01 am
content: so which wires are tied together? I cant make sense of the wiring diagram.There should be one ground and one wire for each function? I know if you just start crossing wires it blows the fuse so trial and error isn't an option.

author: Beamin
author_rank: Super Contributor
timestamp: August 28, 2018, 01:07:32 pm
content: OK I almost have this figured out:There is 24volts and to turn someting on you connect thet 24v to the appropriate terminal: So to turn the fan on you connect R(24v) to Green which goes to the fan?But to turn on the a/c do you put 24v to O-cool G-fan and Yellow-compressor?X2 - Black - Emergency HeatO - Orange - Cool (Change Over)G - Green - FanY - Yellow - CompressorT - Tan (Brown) - Thermistor (Outside)R - Red - 24 VAC HotW - White - Aux HeatU - No Conn. - Jumped to W below terminalsF - No Conn.B - Blue - 24VAC Common

author: MarkF
author_rank: Super Contributor
timestamp: August 28, 2018, 02:25:35 pm
content: I was able to find a manual for the replacement thermostat. In it Figure 5 appears to be the closest to yours.As for the low voltage cables, my heat pump has a cable from the outdoor unit to the indoor blower unit and a second cable from the thermostat to the indoor unit. The cable you posted with the insulation opened my go to the outdoor unit instead of to the thermostat. Something to trace down.

author: Beamin
author_rank: Super Contributor
timestamp: August 28, 2018, 02:31:23 pm
content: Quote from: MarkF on August 28, 2018, 02:25:35 pmNo I traced this cable goes into the floor right above where the thermostat is.Do you think that would work hooking up these three colored wires at the same time to the red 24vac wire? I just don't understand what "cool" is unless it controls valves and things to the compressor and don't know why you would want that separate.I wish I had access to the fuse then I could just keep trying until it worked or ran out of fuses.

author: MarkF
author_rank: Super Contributor
timestamp: August 28, 2018, 03:49:47 pm
content: Quote from: Beamin on August 28, 2018, 02:31:23 pmIn a word: NOIf you want to force the unit into cool mode, you will need to totally disconnect the thermostat and jump the correct wires together to force it to turn on. Here is a quick current flow through the thermostat while in COOL mode (Red=High, Yellow=Switched, Blue=Low). NOT WIRE COLORS.Not sure what you mean by "COOL". In the center of the circuit diagram are the two switches on the thermostat (i.e. Fan Switch and System Switch). Fan Switch: Auto, On and the System Switch: Emerg. Heat, Heat, Off, Cool. On the lower right of the diagram, "Cool Crossover Valve" is a reversing value to switch the coolant flow from "cool" to "heat" direction and "Compressor Relay" will turn the compressor ON.

author: MarkF
author_rank: Super Contributor
timestamp: August 28, 2018, 04:10:00 pm
content: This would be the major current flow in HEAT mode:

author: ignator
author_rank: Regular Contributor
timestamp: August 28, 2018, 08:25:02 pm
content: Quote from: MarkF onTodayat 10:49:47 am>Quote from: Beamin onTodayat 09:31:23 amIn a word: NOIf you want to force the unit into cool mode, you will need to totally disconnect the thermostat and jump the correct wires together to force it to turn on. Here is a quick current flow through the thermostat while in COOL mode (Red=High, Yellow=Switched, Blue=Low). NOT WIRE COLORS.Not sure what you mean by "COOL". In the center of the circuit diagram are the two switches on the thermostat (i.e. Fan Switch and System Switch). Fan Switch: Auto, On and the System Switch: Emerg. Heat, Heat, Off, Cool. On the lower right of the diagram, "Cool Crossover Valve" is a reversing value to switch the coolant flow from "cool" to "heat" direction and "Compressor Relay" will turn the compressor ON.__________________________________________Nice color coding of drawing MarkF.The name that is more common use to heat pumps is "4 way reversing valve". Physically 4 connections to reverse the evaporator with the condenser.Beamin: I think you could install a switch at the outdoor unit where I assume your photo is at the outdoor unit terminal board.I would use a 4 pole double throw, as one contact needs to be normally closed, and 3 normally open.To 3 of the poles, connect the R terminal, and the contacts when closed to the G, O, and Y. To disable the Auxiliary heater, the normally closed contact would interrupt this, so it would be wired between the W terminal and the White harness wire. The 4 pole switch would be just a 2 position, no center off needed. One position puts the wiring as per the diagram, the other opens the aux heat, and closes the fan, 4way valve, and compressor.Note the thermostat is fully defeated when switched. So a 4 pole DT relay could be used, with some sort of remote wireless circuit where a thermostat in your room will switch this.

author: BradC
author_rank: Super Contributor
timestamp: August 29, 2018, 01:30:42 am
content: Quote from: Beamin on August 28, 2018, 09:05:14 amSounds like you'd be better off learning to pick a lock.

author: MarkF
author_rank: Super Contributor
timestamp: August 29, 2018, 04:39:14 am
content: Quote from: Beamin on August 28, 2018, 09:05:14 amI don't understand how the light switch comes into play.But, how are you going to power the unit if he turns the light switch off?I'm afraid you are heading for a big repair bill, legal fees and eviction when he finds out.....

author: Ian.M
author_rank: Super Contributor
timestamp: August 29, 2018, 06:39:34 am
content: Typical Beamin!The sane thing to do if one was in the same situation, would be to report one's concern about the landlord's deteriorating mental state to an appropriate social services agency that deals with the elderly, + start looking for alternative accommodation in case the landlord is resistant to the social worker's recommendations, and offer to pay to have the HVAC zone controller moved to the hallway by a qualified HVAC technician.Beamin's first reaction is to hack the hardware without permission and incompetently, which when its discovered (and it will be) is likely to be construed as criminal damage or theft of service.I gave up on helping Beamin when I realised that their ethics (defrauding EBAY sellers and other suppliers and proud of it) were totally incompatible with my own.

author: Beamin
author_rank: Super Contributor
timestamp: September 03, 2018, 03:38:48 pm
content: Quote from: MarkF on August 28, 2018, 03:49:47 pmI'm so lost. That second picture I posted in the middle of the thread I found on the internet, so that might not be right.I cut the red yellow and green wires that are going into the floor of the attic and then tied them together on the unit side: they are no longer going to the thermostat. When I turned the breakers on after hooking these three wires together and I left it on for 10 minutes HOT air started coming out. I was so close. I have two more days here. The guy has left for the day so we are sweating. What a horrible person.So maybe the second picture is wrong. What else can I do? I don't want to just start guessing random wires as that will just blow the fuse. I don't really understand that second diagram.As far as I know there isn't a heat pump how would I check? This to me looks like exactly every other regular A/C unit I have ever seen.

author: MarkF
author_rank: Super Contributor
timestamp: September 03, 2018, 04:21:17 pm
content: Tying the orange wire to the red wire switches the unit from 'heat' to 'cool'.red -> green turns on the fanred -> yellow turns on the compressorred -> orange sets the reversing value to 'cool'

author: Beamin
author_rank: Super Contributor
timestamp: September 03, 2018, 09:24:18 pm
content: Quote from: MarkF on September 03, 2018, 04:21:17 pmDo you leave it connected permenately for cool? And maybe use the -24 to switch it back to heat? IT was blowing out really hot air unlike the fan which blows warm air.Well since I'm out of here in a few days any going away mods I should leave for this guy? Like just wire the hot on all the time? I don't take kindly to people punching me for turning on the a c I fixed for basically free for him.I have a lock on my door and sole access to the attic. Nothing destructive but maybe just make it act funny.Like put diodes on the red wire and see if the unit will pulse making it cool but very slowly since it will only be on half phase or do something werid with the shaded coil in the relay?? Reverse heat with cool?

author: MarkF
author_rank: Super Contributor
timestamp: September 03, 2018, 10:40:57 pm
content: Quote from: Beamin on September 03, 2018, 09:24:18 pmNO. It's a heat jump. It has to both heat and cool.You forced it into heating mode. That's why it was blowing hot air.QuoteLIKE PUT IT BACK THE WAY YOU FOUND IT !!!YOUDID NOTDO HIM ANY FAVORS.HE WILL NEED TO PAY SOMEONE TO INSTALL A NEW THERMOSTAT WIRE AND CORRECT YOUR GAMES.

author: Beamin
author_rank: Super Contributor
timestamp: September 05, 2018, 09:10:15 am
content: Quote from: MarkF on September 03, 2018, 10:40:57 pmThis ind soul took everyones security deposits went to the casino lost all the money and told us to fuck off when we asked for it back. And when we first moved a family member let him borror the car gave him money to put gas in it, put diesel in didn't tell anyone until we tried to start the car. After a long time of cranking and being late to work the next day the car made a smoke cloud so big it was totally hazardous to drive to the shop. Since my family member owned a sop it cost over $1000 in parts alone to fix the engine and drain the tank which as full of diesel fuel, and to this day he will not admit to putting diesel in it. If that wasn't bad enough my former roommate who has passed away from cancer had all of his medication stolen by this man while he was at the hospital getting chemo. He was too weak to call the police and spend the last few days on this planet legally fighting tis guy. And that's not even part of the things I have seen him do while I was living here. Just yesterday he took some ones deposit ho moved a few days ago went to the casino again and lost it. This pile of shit is one of the worst human beings I have ever met. What would you do?

author: BradC
author_rank: Super Contributor
timestamp: September 05, 2018, 09:14:05 am
content: Quote from: Beamin on September 05, 2018, 09:10:15 amLeave and don't look back. Take the high road though and just walk away. Malicious damage just makes you look like a dick.

author: Beamin
author_rank: Super Contributor
timestamp: September 05, 2018, 09:21:15 am
content: Quote from: BradC on September 05, 2018, 09:14:05 amThat's more then likely what I will do. I just hate seeing these people just get away with this stuff... causing great pain so they can have extra when they already have more then they need.

author: ignator
author_rank: Regular Contributor
timestamp: September 05, 2018, 02:56:08 pm
content: Beamin, I hope you took photos of your apartment before you moved in. Make sure you take DETAILED photos on your way out. If the landlord refuses to give you back your security deposit, you take him to small claims court. If you win, he will have to pay your court filing fee, and statutory interest from date of your exit. Some states it's treble damages if he fails to send you a letter detailing damages. Also do a walk through with him. You may wish to video this. If you live in a state that requires the second party knows about recording, then inform him on the recording you are doing this. But photos is the only thing that can show you left it in clean condition. Normal wear and tear is not damage, but you must show you left it clean. If you painted any of the rooms, you must return them to their original state.If he fails to pay after you win the judgement, you file a mechanics lean against the property. He can not sell the property until the lean is cleared. So you may have to wait. As well depending on state or local laws, you may have to refile the lean per a time period.Don't just walk away thinking you have no recourse to your deposit. Unless you use it as last month, which is against the law, and he can then suit you for damages if you leave any. But make sure you take time stamped photos no matter what you do with any rental.