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What would Dennis do
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Добавлен 30 июн 2013
Refrigeration and Air Conditioning info
From my whatwoulddennisdo website and community pages
check out www.whatwoulddennisdo.com
From my whatwoulddennisdo website and community pages
check out www.whatwoulddennisdo.com
Fixing the Head Pressure (S.C.T)
Hi all
Yes this is me, people for years going, who are you?
In this vid, lets consider whether fixing the head control or "Saturated Condensing Temperture" is a good idea.
Well for conventional Thermostatic expansion valve systems, its sometimes very necessary for low ambient issues.
Since TXV's work on pressure drop vs capacity , they need to be selected for optimum pressure drop at design ambient and refrigerant conditions in the evaporator.
Yet if we do fix head pressure by floating the head on a fan VSD or reverse acting high pressure control... we fix the compression ratio for life reducing the ability for a system to benefit from low ambient conditions which can reduce power input and re...
Yes this is me, people for years going, who are you?
In this vid, lets consider whether fixing the head control or "Saturated Condensing Temperture" is a good idea.
Well for conventional Thermostatic expansion valve systems, its sometimes very necessary for low ambient issues.
Since TXV's work on pressure drop vs capacity , they need to be selected for optimum pressure drop at design ambient and refrigerant conditions in the evaporator.
Yet if we do fix head pressure by floating the head on a fan VSD or reverse acting high pressure control... we fix the compression ratio for life reducing the ability for a system to benefit from low ambient conditions which can reduce power input and re...
Просмотров: 900
Видео
Split system higher function check
Просмотров 2463 года назад
Well we talked about communication issues and LEDS on indoor pcbs. So what about the rest of the indoor? Inverter split system use DC perrmanent magnet motors on the indoor unit, they have a DC rectifier inbuilt on the pcb and the fan motor is converting that to a three phase signal. Fan only mode on some split systems allows for operation of the indoor fan motor without a command signal to the...
Split System LED's
Просмотров 2363 года назад
Well another cheesy vid but , it gets you thinking. Are we paying attention to the LED monitor lights in air-conditioning systems? They tell us much more than just that the microprocessor is healthy. Yet sometimes they are hiding the truth about our system in plain sight.
Product Load Calculations
Просмотров 1,3 тыс.3 года назад
Info on product load calculations. There are more loads , like Wall, Air change and miscellaneous that goes with a full heat load calculation. After which you calculate the required capacity based on pull down time. The product part is of interest to many on how it is calculated.
Electronic expansion valve
Просмотров 12 тыс.5 лет назад
Lets have a brief look at a more common type of electronic refrigerant flow control expansion device. The 4 phase linear pulse valve is very basic in its design but offers much needed flexibility and precise superheat control. This stepping motor type is now seen on both air conditioning and refrigeration systems. Many are apprehensive about working on or servicing them, the idea of this video ...
Why do motors rotate?
Просмотров 3286 лет назад
Ok, im not going to go into the full dynamics of phase shift and phase vectors, or show you the mathematics behind motor theory. This has been covered on youtube very well already. All you need to know is that magnetic fields which fire in phase do not create a rotational magnetic field to turn a motor. They just pulse . An out of phase fired motor will create a rotational magnetic field. Rotat...
PWM & Solid State relay
Просмотров 9 тыс.6 лет назад
Filmed in controlled safe conditions.... Here we are having a look at PWM and a solid state relay. Unlike an inductive contactor the solid state relay can switch at higher speeds by semiconductor operation using PWM input. Using a trigger input from the PWM the relay can operate to a duty cycle arrangement controlling the output energy without changing the applied source voltage. I also demostr...
Phase control motor position sensor
Просмотров 2,3 тыс.6 лет назад
Here we are testing a phase control motors hall effect position sensor. The position signal is mapped at 120 degree angles which allows 3 signals back to the PCB per rpm. Each on and off signal is occuring at differing rotor position in time so it is technically a phase shift between rotor and signal. You can see the square wave signals forming on the cro and lead/lag. The indoor PCB regulates ...
The Evaporation Process
Просмотров 2916 лет назад
This is an introductory level for new apprentices based on suggestions given to me by followers. The process begins with heat absorbtion and that process can seem complicated. Remember, Conduction, Convection and Radiation form the basis of heat transfer. Refrigerants are the heat absorbtion mechanism while compressors are the heat pumps to transport it around the system.
Start capacitor used with CSR motor
Просмотров 5847 лет назад
Welll take two on this vid. Modified after being advised that the NTC is used to disable the start capacitor along with the current relay. I have seen other relay boxes with overload voltage protection with commutated motors to protect the electronics such as varistors. So thanks for keeping me on the straight path with that one. That aside , this vid was to show start capacitor saturation usin...
Split system BLDC motor position fail.
Просмотров 1,8 тыс.7 лет назад
Hello all, Here we revisit the brushless DC motor used in Split System air-conditioners. By creating a position fail on the motor you will see it speed up very fast before faulting. This is fairly typical with phase control and brushless dc motors using hall effect sensors. The indoor pcb tries to overcome a rotor pulse input loss by increasing command speed. Yes the vids are a bit shaky, but i...
Back EMF with potential relay operation
Просмотров 5 тыс.8 лет назад
A short video to show you the higher voltage created by the induction motor on the compressor to disengage the potential relay. Here we have interfaced the potential relay coil within the electrical box to show the back emf compared with source voltage in (please note Australian rated power supply)
Protection Module on Semi Hermetic
Просмотров 90 тыс.8 лет назад
This is the Lodam SEB1 (signal evaluation basic) used on Bitzer semi-hermetic compressor. Here we have created a simulation rig to show how it detects motor overheating. The compressor uses embedded PTC thermistors in the stator. With up to 9 in series , anyone can create an overload condition using a series looped total resistance signature R1 R2 R3 etc until the trigger resistance (equivalent...
Simple DC motor
Просмотров 2018 лет назад
Exactly 20 turns of laminated wiring to make the rotor. The pole ends are etched at 180 degrees to provide the short circuit for alternating commutation and reverse current flow. Using a permanent magnet and power supply from 6Vdc battery, see how magnetic field reversal affects the direction. Note that brushless DC motors do not use commutation and effectively arrest any sparks/ozone generatio...
Pressure Transducer testing on Air-Conditioner units.
Просмотров 20 тыс.8 лет назад
Firstly .. its a bit out of focus in places due to my camera auto focus system falling over. Sorry but will replace it with V2 when possible. This is a VRF air conditioner transducer modified to accommodate an external DC power supply interface. I have used a manual hand pump to increase pressure to manifold gauges to demonstrate the feedback voltage supplied to the AC micro-computer by the tra...
Split System AC main earth/neutral feedback (Australian power)
Просмотров 2928 лет назад
Split System AC main earth/neutral feedback (Australian power)
Split system air conditioner communication with ocilloscope
Просмотров 4,6 тыс.8 лет назад
Split system air conditioner communication with ocilloscope
Air Conditioner Communication testing using the Refco tool
Просмотров 35 тыс.8 лет назад
Air Conditioner Communication testing using the Refco tool
Inverter testing using the Refco Inverter checker
Просмотров 34 тыс.8 лет назад
Inverter testing using the Refco Inverter checker
Gracias por el vídeo desde Colombia ❤
Is that PTC replaceable?
@billyeddy6974 Lodam is a company owned by Bitzer that make the protection modules which are replaceable. The internal PTC thermistor array in the stator is fixed.
I added a Hard Kit that is a potential relay and a cap. I had some buzzing from my main breaker panel in the house so I fugued the kit would help. It helped, but not as much as I thought. But, I need to figure out how to size a fuse and where to connect it between. I don’t want the potential relay getting stuck closed. I’m having a hard time deciding where to put the fuse?
7:01 400kPa = 58 PSI
Thks!!
Sir hamari company me ye compressor me protection relay he jisme comman se no me power nahi aata he to kya problem hoga, ek bar relay bhi change Kiya he
All 6 lights blinking mean bad board?
Would this type of tool be necessary for residential diagnostics?
You can use it, but in terms of necessary, not really. Manufacturers have their flow charts and readings for tests like this in the service manuals. As I mentioned in the video, I did not find it conclusive.
Thanks Dennis
Can we make an esp32 controller to make a controller for the outdoor unit?
i see it only comunicates on postivite dc voltage
With ac or dc there are no positive or negative voltages , meters read negative voltages when they read opposing current flow from their designated polarity. If i reverse this tester, it will read opposite. I found this device not conclusive to what I do know about the unit I was testing.
@@whatwoulddennisdo7243 thanks for the explanation
No probs, thanks for commenting
Hello, greetings! We replaced the compressor module and when it starts, it shows a pulse at start-up, turns on, turns off and then turns on again. We tested it outside the compressor and it has the same behavior, it could be a factory defect in the module?
Hi, thanks for your comment. I suggest you take that up with the manufacturer with the behaviour of the module. Would be a good idea to check the total resistance of the internal sensor loop to ensure its not close to the trigger resistance.
Thanks for explaining sir 🙏
Hi friend i need semi hermitic compressor full wiring diagram plz make other one video
Thanks for the very valuable video . I came here after my compressor got heated and burned out. This safety device was untouched ,dnt known how this device ddnt worked.
Your comment on the saftety device being untouched is the exact reason I did the video. Indirect safety controls, which do not form part of the main power bus in can get ignored. Hopefully, everyone can appreciate the quality design of the protection symmetry within the stator that is offered.
Hi.. may I know if the connection or the diagram of SE-E1 and SE-B1 are the same?
How much cost and where it available please
I do not sell them, check with a Refco agent or dealer . Typically refrigeration wholsalers sell them
@@whatwoulddennisdo7243 thanks sir
Best explanation on youtube
Hello Dennis, I recently bought this device and when I try to check the data flow between idu and odu both data lights aren't flashing but they are just turned on. I've seen many videos but I still can't solve the problem. Any ideas on what's going on with my device?
Hi, thanks for your comment, I found my test a bit inconclusive based on what real info I know about the brand of unit I was looking at. Not all brands are the same and comms styles vary. Your looking at an analogue signal which can be detected both ac and dc on some multimeters It's a handy thing, too, since if you take a 2 wire wall controller, the signal is both a power supply to make it light up and function, and an AD signal to the indoor pcb. This is why many brand manufacturers provide their own comms tools with real-time read data. This tool is just pinging signals in voltages. I suggest checking with the brand manufacturer of the unit your servicing as I found this tool not compatible on the same maker's brand across other commercial models using the same interconnect.wiring between indoor and outdoor.
Hello, great video. I am a HVAC technician here in New Zealand and have been searching for a universal test tool just like this for troubleshooting heat pump system / dc fan motors. Any chance you could point me into the right direction? I see a few people on Oz using them. I cannot seem to find them anywhere.
Hi, this rig I built to interupt the signals to a dc permanent magnet motor so I could demonstrate fan harness to pcb driver testing positions. normally too difficult to test due to small test points. Many manufacturers use similar motors but voltages and pin references change so this one was made to a specific well known brand. I use it to train students in a safer manner. Check with your brand manufacturer and see if they have a comms tool that can display more motor telemetry. These days its all reverse bias resistance tests from given pin points.
IV been told that it's no big deal if you bypass them cause they are fitted with a overload on the contactor
Don't know these compressors come with supply contactors or not ,but mine does not have one. I had to install the contactor separately. I think not many contactors have thermal overload relays with them. Thermal overload relays need input from temperature sensors anyway. It's not a good idea to bypass this safety device ,in the first place.
Hi Dennis, many thanks for your super information and helpful video with clear explanations. My LG ducted split aircon ducted aircon (model B55AWYU362 with indoor unit B55AWYN7G5) has developed CH10 error recently. CH10 points to loss of indoor fan motor feedback signal for about 50 secs and shuts unit down. A reset on the breaker clears the error but similar error developed on restart. Some checks and troubleshooting: - checked fans near the indoor unit. Fans were running ok, without any abnormal vibrations or abnormal noise. - manually rotate both fans and both were spinning freely (nothing is seized) - cleaned motor driver pcb with isopropyl alcohol snd checked connections. Nothing abnormal visually. Started aircon but tripped on similar error - Suspected motor driver pcb to be faulty and replaced with a new pcb but aircon tripped in similar manner with CH10 error. - There is another pcb next to the motor driver pcb and assumed this to be healthy - with the above observations and after watching your video, I suspected the feedback signal from one of the 2 fan motors are faulty, causing the trip after around 50 secs. I’d appreciate your advice on the possible issue and next steps. I assume the pcb next to the motor driver board will not cause CH10 but not sure if this is correct. Thanks
CH10 on an LG is a fan position lock fault. Simply put the DC fan is not sending back motor telemetry on rotation. This is either a fault with the pcbs ability to send a reference signal voltage to the motor or the motors ability to send back the hall effect signal in due time. Things like dry joints in harnesses or cable's can cause this too. The fan motor has a driver board, this is where command and response occurs. Smaller units are all integral to one outdoor pcb but some larger systems will have a separate fan driver. PS you cant spin a dc fan motor with a blade on it, as it will give weight ballast to faulty motors and make them seem OK.. Try it with the fan blade off and see if it feels notchy while unplugged from the board. This is a sign of internal issues mechanically. Good luck
@@whatwoulddennisdo7243 Thanks Dennis. I reviewed my troubleshooting steps and realised I have only 100% verified one of the 2 motions were spinning when aircon was switched on. The motor at the further hasn’t been verified. I did a check on this yesterday and found the fault - that motor wasn’t running at all (failed). Getting a spare motor now. Cheers
@@whatwoulddennisdo7243 does the pcb send a reference signal via the feedback wire or does the motor take voltage from the high DC voltage wire and send a little bit of it back to pcb via the feedback wire? Thank you
@@LC-qi5ff The single phase dc motors use Vcc control voltage and send motor position feedback via the hall effect ic to the pcb to give it a speed reference. All the pcb driver will do is increase or decrease command voltage until the speed reference or tach signal meets the programmed speed set by the designer. These motors have multiple operations going on at once. See the multimeters
Thank you for the demo. My Daikin fan motor of the outdoor unit not let the PCB start up. When I disconnect the fan plug the diagnostic LEDs go on. In the motor the blue and brown wires are shorted internally with each other. My question is if this motors can be repaired? ... You answered down in the other comments.... Not serviceable. Thank you.
hi, compressor se e1 gives an alarm in my system, could you help me?
Thanks for your video. I"m in la PAz B C S Mex . And I been working in a 27 hp bitzer compresor, I repair the compresor but I cant reset the int69. I replace the int69 and still show me a fail. You think is yhe resistence that is failing ?
An SSR will turn on with the control voltage. But it will not switch off until the AC voltage goes to 0 volts. Because there is a Triac (AC Thyristor) in there, not a transistor. But you can dim the power if you switch on synchronously to the AC wave or shifted to the AC.
With if your signal wire is reading 5 volts all the time no matter the pressure? Compressor will not engage on its own but i can command it on with a scan tool.
The command voltage is referenced typically under 4vdc and the operation of outputs is governed by logic rules not just voltage inputs
@@whatwoulddennisdo7243 so could i have an open or problem with the sensor or board? Just doesnt make sense why i can command the a/c compressor on with the scan tool but it wont come on under normal operation. I have 5 volts all the time on my signal and ref wire. Never changes. But i can pull the signal wire down to zero by jumping it to ground. To me that shows my circuit is good but the sensor isnt doing its job. Im still learning and your video is the only tbing ive found on 3 wire a/c pressure transducers. Im trying to figure out a good way to test it without just throwing parts at it. Thank you for your reply.
The only way I can test these is with the manufacturers pressure voltage graph, all other issues come down to connections or applied rules if operation
Wow. Nice tutorial sir. Thank you for the knowledge that you share ❤️
Thanks I'm working on a commercial AAON and couldn't figure out how to test the head pressure transducer 👌
Its simple analogue but you need reference chart's.
Can this test directly on the compressor?because I have a Fujitsu mini split inverter keep having faulty PCB board,some say because maybe the compressor has kind of sorting or something but when replaced the PCB the compressor running very smooth and very cold
The tester is designed to check the power transistor switching on the inverter pcb. The compressor test alone would be resistance based. Testing any insulation faults is a must on the compressor as the IGBT will fail quickly on compressir earth shorts. Find your manufacturer testing instructions for the compressor
Thank you Dennis!!!
Is common on a compressor neutral??
The way these compressors whould be wired is with the phase to the common via the thermal overload. This way phase is cut to the motor on a thermal overload fault. You can wire it with the common as a neutral feed out via the overload but in fault the compressor is still under a potential charge. Most systems I have seen bring phase to the overload and common providing you have the polarity right at the electrical box
Iv seen two different ways on wiring a potential relay. One where power starts from common and another where power Starts from the run winding and goes goes through common. Can you make a video showing how you wire one up
Yes i can make a vid, i have a relay case with all the components than can remote fire a CSR refrigeration motor . Now I have to go and make that for you. Thanks for viewing sir
I've been scratching my head, trying to better understand how the steady state back EMF can be higher than line voltage coming in. An intuitive first look sends a red flag, that our observation is trying to violate the first law of thermdynamics. In a single motor, back EMF from generator effects will naturally grow as rpm increases, to the point that there is an equal balance, with steady state rpm and low antegrade current overcoming mechanical resistance. I'm guessing that back EMF for a simple motor would only be higher during faster states of passive spin, such as regenerative braking of a vehicle where kinetic energy is converted back into stored energy in the battery. In these HVAC motors with dual windings, is this higher steady state voltage possible because antegrade current through the run winding overdrives the rotor, spinning so fast that the back EMF on the start windings exceed incoming voltage? Are potential relays ever used in motors that do not have dual windings?
Potential relays are used in refrigeration compressors that do not disengage the start winding. These are basically permanent split phase cspacitor motors thst use a capacitor start. The relay only disengages the start capacitor. I have not seen them anywhere else. They dont use current relays on high torque single phase compressors as this would add unwanted resistance to the run or main winding. Other than that most other types of older ac motors use centrifugal switch, like a pool pump or just simple split phase design. Thanks for asking
So blurry I can't watch it. Seems like a great video though
Yeh sorry, i did these in my lunch breaks
Hi Dennis, I am trying to run a motor just like this 325V, 1amp fan continuously without it being connected to a PCB fully (or bypassing the PCB logic) to use only the fan portion of the mini-split (I will circulate glycol/water through for air cooler application). I'm therefore wondering a few things: is the 325v always on such that I can use that from the PCB board output? Also, would I then just need to interrupt the 3v-6v "speed/on" control and input 6v from maybe an external AC to DC transformer? I guess I would keep the position sensor variable voltage going back to the PCB. Basically, is this mode of operation considered the heat-only mode, where it doesn't look for the coil T1 and T2 thermistor temperatures (ohms). Lastly, I was going to try to use another separate 12 or 24 V transformer for the 3rd S3 power input to the "evaporator" unit (Positive connection only since I don't know what to do with the common neg side). Any comments as to whether this could work before I buy/try stuff would be greatly appreciated! TY!
Wow that sounds like too much work to me, Have you considered a simple EC or electronically commutated motor that converts AC to DC operation and can also use a variable input. Dont try to circumvent manufacturer logic on an established system.These motors you see are made by common parts manufacturers and are setup by design speed needs by the aircon manufacturers. Once you try to bypass sensors on systems , they detect each other faulty or they cause other operation glitches. Whatever your planning, I suggest you come up with something new and independant. My vids show how the logic works to correct manfunctions
Very important video for me Dennis.. Thank you. May I have your contact? I have big problem about bitzer comp, coil engine tripped even comp just started.
I just installed a SSR on my AC heat bed of my 3d printer.I was wondering how the relay was working the output while having a PWM input signal on the control voltage side.Guess this helps little bit more of what is going on. The AC heat bed it 120vac 1600w and is doing just fine with mataining where i set temp at.. Thumbs up.. :)
It would be nice to see the output voltage of the load on the oscilloscope as it relates to the duty cycle changing, is it acting as a triac only changing states at the zero cross?
I've been looking for information on the performance of a dc-dc solid state relay when operating under PWM, and if this could be used to control a DC blower fan.
The fan would be an inductive load and I don't think you can pwm inductive loads - only resistance loads.
@@LarryKapp1 I used a mosfet array to do it for a while but it couldn't take the load of the fan. It worked, for a while, then broke down.
Que posibilidad esta instalación pero en español..
Esta concepción concepción pero en español. .el video
My A/C blows warm air at idle and when I’m driving it blows cooler?
How would u wire that relay using pwm ground? I have the same crydom relay and need to pulse ground.
Thank you. Thank you. Thank you. Other refer channels talk about these and assume you know what's presented in your video.
Your most welcome sir, thankyou for watching my channel
Thanks, but need a lapel mic.
True, these were done during my lunch break at work.
@@whatwoulddennisdo7243 Ok. Very good.
Very usefull
Shame that we cant mix and match different brands. Or even run stand alone via a pot free contact or something.
Hey well done.. The way manufacturers protect their intellectual property is to make communication time dates different. Always remember the hardware is the same but the software creates the brand.
Why you stop making new videos
I am sorry, I will be back soon
Amazing job , thanks for sharing
Brilliant and informative. Thanks
Thank you