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    Hard to find refrigerant leak

    So I have this hard to find refrigerant leak on a residential unit and I have used the leak detector and soap bubbles and wow where I thought I would normally find the leak I cannot locate. Looked at...
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    What is Admonition?? Did they mean Warning?? Jeez...

    What is Admonition?? Did they mean Warning?? Jeez talk about translation
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    Thanks crabmaster I did see this online and it is...

    Thanks crabmaster I did see this online and it is different than the frequency drive I am working on. I am speaking with the rep in china that sold the frequency drives and am getting a translated...
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    Thanks orion I actually downloaded the google...

    Thanks orion I actually downloaded the google translator app and it has helped.
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    It's made by LIPU model is LP-A2000

    It's made by LIPU model is LP-A2000
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    VFD Question

    I have an issue at a jobsite where the motor is programmed in parallel low voltage and for some reason the VFD is reading 2 legs of amperage instead of 1 and is going on out on amperage overload...
  7. PROBLEM SOLVED- So today I was able to finally...

    PROBLEM SOLVED- So today I was able to finally figure out what was going on with the Trane Unit constantly going into Supply Fan Fault. What was happening was that the auxiliary contact next to the...
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    See what options your BAS system provides you. Do...

    See what options your BAS system provides you. Do you have morning warmup from the package units with gas heat? Maybe. You really need to invest the time to learn your new building. People can help...
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    I would see if you have a night setback option on...

    I would see if you have a night setback option on your BAS system and set that setback to 80 degrees. If your VAV's were balanced properly they should provide the correct CFM based on temperature...
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    And yes the 2 of the pumps were designed already...

    And yes the 2 of the pumps were designed already with a toggle switch and contractor/overload to start them that is how it was made by the manufacturer. I just added a 3rd for the meantime. I enjoy...
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    Just to clarify what happened. The owner of a...

    Just to clarify what happened. The owner of a business went ahead and bought a process pump/tank systemthat is used off of EBAY without consulting with anyone apparently he was looking for a process...
  12. Hvac69 thanks for the help your post makes the...

    Hvac69 thanks for the help your post makes the most sense I checked the airflow proving switch wires at the RTM for continutity when I lumped it and it did give. I will check for voltage when the...
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    KontrolphreAk this is not a DIY it is some...

    KontrolphreAk this is not a DIY it is some assitance from other professionals here on hvac-talk on a specific wiring configuration on a vfd issue. There has been clarity on how this vfd was wired....
  14. I'll check that

    I'll check that
  15. No not on a VFD on a rooftop package unit with 4...

    No not on a VFD on a rooftop package unit with 4 stages of cooling and heat exchanger. Lots of control boards on the controls side with the Intellipak controller LCD display
  16. So bwood what do you mean about the tube? The...

    So bwood what do you mean about the tube? The tube is going through that tension cup that you squeeze through. Not sure what you mean.
  17. What do you mean by sensor installed in the...

    What do you mean by sensor installed in the correct position? The tube is being fed from the bottom of the sensor to the access hole. The unit has worked for years just fine and now suddenly "Supply...
  18. I used a jumper cable to jump the proving switch...

    I used a jumper cable to jump the proving switch and make the contact be closed at all times and it is still turning off randomly. I think the RTM is bad.
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    ABB Wiring Diagram

    Attached is the diagram for the VFD wiring I am working on. And it is wire 2 and 6 that I guess send the run command to the VFD and if you look between 2 and 6 you will see CR1 which is contact relay...
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    So what I am understanding is that since the VFD...

    So what I am understanding is that since the VFD makes 24 volts from 480 provided than the 24 volt wire is feeding to the cube relay instead of from the cube relay? I guess so but where does the...
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    I swear looking at it it looks like a wire from...

    I swear looking at it it looks like a wire from the 120 volt relay cube is wired to the 24+ terminal on the VFD. I see where the 480 is coming in and 480 going to the motor but on the control...
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    The control voltage from the pump control panel...

    The control voltage from the pump control panel is 120 volts and it is feeding to the VFD which says on the terminal 24+ volts. Someone here said the VFD makes its 24 volts from the 120 prvided to it...
  23. Trane rooftop unit intellipak on Supply Fan Fault

    Here's a tough question, one of my Trane rooftop units intellipak is reading "Supply Fan Fault" status constantly, the unit shuts down and needs a manual reset. I read on the diagnostic manual that...
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    Pricing on an install

    Guys so I still run into issues with pricing correctly. Sometimes I will price a bit under and not make as much money as expected on the job. Any advice how y'all price when infront of the customer...
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    Also everyone the process pump tank system...

    Also everyone the process pump tank system actually has 3 pumps - A process pump/standby pump/ and recirculating pump and believe it or not 2 of the pumps are on a relay toggle switch with an...
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    Well everyone the big mystery has been figured...

    Well everyone the big mystery has been figured out with this ABB Drive. IT IS FAULTY. I spoke with ABB over the phone and they concluded that one of the boards is bad and to send the Drive to them to...
  27. BBeerme you hit the nail on the head in regards...

    BBeerme you hit the nail on the head in regards to my meter not reading correct resistance. The cube relays are very small and the meter is not reading any of them, which means it is the meter. I...
  28. Good advice thanks....

    Good advice thanks....
  29. Replies
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    smsmechanical the coil for the relay that...

    smsmechanical the coil for the relay that energizes the VFD control signal is a Siemens 120 volt cube relay and the frequency drive shows on the terminal board that it needs 24 volts. This unit was...
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    Thanks Jman2794 that makes a lot of sense I am...

    Thanks Jman2794 that makes a lot of sense I am going to look at the control relay and make sure those contacts are closed when unit is turned on. There is an emergency stop relay which is the first...
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    Hey Smsmechanical the motor is a 3phase 40HP 460...

    Hey Smsmechanical the motor is a 3phase 40HP 460 volt wired motor.
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    Hey Sms I don't have a lot of experience with...

    Hey Sms I don't have a lot of experience with programming or installing frequency drives just dealing with the usual Alarm 2021 start enable status but yes the relay coil is 120 volt but on the DC...
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    It is a 20 year old VFD Drive so I don't know if...

    It is a 20 year old VFD Drive so I don't know if age has anything to do with it. It has 3 pumps and the other 2 pumps is running from a toggle relay switch and only 1 od the pump motor is running...
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    It only says "drive is in fault" it doesn't give...

    It only says "drive is in fault" it doesn't give a specific fault status. That's what puzzles me the most. I also noticed the control transformer is 480 to 120 for the pump relays yet the drive is 24...
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    ABB VFD Drive Question

    So I went to a jobsite to help a business owner who's employee with very little technical knowledge tried connecting a process pump to run. What they accidentally did was send 208 3phase voltage to...
  36. I've been a building engineer for so long now on...

    I've been a building engineer for so long now on a commercial site I was sent to troubleshoot a control panel and it's been years. It came back to me after speaking with a few folks here to isolate...
  37. It was the socket but with the cube in the socket...

    It was the socket but with the cube in the socket across the coil terminals. (13 &14 in this particular cube relay)
  38. I checked the socket with the cube relay in it so...

    I checked the socket with the cube relay in it so I should have had some continuity since the cube was plugged in across the coil terminals.
  39. Good Point

    Good Point Smsmechanical I will check these tomorrow to isolate the short. It is rather difficult, no wiring diagram and a 30 year old control panel for a 3 motor configuration. Lots of relays,...
  40. Testing an ice cube relay for a short

    Hello so I have a question I have a control issue where the control fuse keeps blowing and I suspect it is the coil on the cube relay. I checked across the coil of the relay on the socket and did not...
  41. Charging a Trane Mode # SWUD Commercial Air Handler Unit

    Hello I recently became a building engineer (I was a residential service technician) and I have to charge a 15 ton compressor that holds 27lbs of refrigerant. This is new to me as I am use to...
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    Thanks for the info ControlsinMT I am actually in...

    Thanks for the info ControlsinMT I am actually in the process now and submitted my application for pro. Just waiting to hear back from the administrator.
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    Question about charging a unit

    I have a question about charging a large commercial hvac unit. I have now become a commercial building engineer at this point of my career (I was a residential hvac technician) and notice that these...
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    Removing filter drier properly

    Just a question about removing a filter drier. Do you techs think it is better to cut the filter drier off with tubing cutters or just unbraze it directly off the coupling? I have heard it is bad to...
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    Questions about NIULPE License

    I recently got my NIULPE Class 4 Power Engineer's license. Does it have any actual worth?? I'm trying to get my DC 3rd Steam Engineers License but I was wondering what you all think about NIULPE.
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    Well I finally figured out what this is....it is...

    Well I finally figured out what this is....it is a relief valve to prevent overcharging the system with refrigerant. This is a commercial Air Handler Unit and holds around 100 lbs of refrigerant (4...
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    Trane package air handler unit

    I have a question, I noticed my compressors in my air handler units have some type of relief valve connected to the hot gas discharge line leaving the compressor. It tee's off to another copper line...
  48. What does the 2nd TXV in a heatpump in heating mode do?

    I was wondering what the TXV going into the condenser does when the heatpump is in heating mode. I know the evaporation coil has hot gas and is subcooled by the cold it absorbs, so it returns to the...
  49. Question about removing acid from a system when a compressor burns out

    Hello I have a question about what is the best way to remove acid from an ac system. I usually install a suction line filter drier after replacing the acidic oil with fresh new oil and have to return...
  50. Question about Water Source Heatpumps

    Hello, I have a question about charging water source heatpumps. I have a lot experience charging air-source heatpumps but none with water source. My question is this: How do I know if I have a proper...
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