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  1. Replies
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    Condensor is to clean.

    Condensor is to clean.
  2. Replies
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    938

    Many guys may be sucked in by that "trick...

    Many guys may be sucked in by that "trick question" but if the same guys walked on a job and saw a flue connected to an electric furnace they would probably not be tricked. It would be posted in the...
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    257

    Check or replace all electrical connections,...

    Check or replace all electrical connections, dirty or poor connections on a MV system will cause this. Test the valve with a flashlight battery.
  4. Replies
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    4,206

    Even older standing pilot furnaces did that. Fan...

    Even older standing pilot furnaces did that. Fan switch sensed heat exchanger temp after burner shut down. Fan ran 1 or 2 minutes letting heat exchange cool down. A high % of systems do.
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    549

    What beenthere said. He means that if you can get...

    What beenthere said. He means that if you can get a two stage with a low fire of 40k but a single stage of 60k min it is probably worth getting the two stage. This is after loadcalc of course.
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    379

    Many drives have PIDs built into there...

    Many drives have PIDs built into there programming. A Static pressure sensor usually in the 0 to 5" range can be wired directly to the drive input and the drive programmed to control to the set point...
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    I would consider having someone engineer a...

    I would consider having someone engineer a condensing unit and evap coil for this application. I am not familiar with the requirements but sounds like you need a high humidity along with...
  8. Replies
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    209

    It looks as if the supply voltage is 575vac and...

    It looks as if the supply voltage is 575vac and the transformers change the voltage to 480 because all the motors in the unit are 480.
  9. Also, and this is just my understanding, the...

    Also, and this is just my understanding, the neutral should never be a voltage carrying wire. it carries current but no or very little voltage. again could be wrong about this.

    I don't believe...
  10. Replies
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    724

    FA= Forced Air, probably

    FA= Forced Air, probably
  11. What's unusual about that is you have no zone...

    What's unusual about that is you have no zone dampers and one system with ducting to both floors but you system can select which floor to heat or cool. Your system is magical. Please tell us your...
  12. Good. He will get his 24 bucks worth from them...

    Good. He will get his 24 bucks worth from them I'm sure then replace the thermostat then wonder about O but hook it up anyway then tell his friends about how he fixed his own system but can't...
  13. Replies
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    2,376

    There is a limit t2 I think that is an input to...

    There is a limit t2 I think that is an input to the ucp. If you jumpered before the limit you can get heat contactor even with open limit. Also I thought you said heat did not work through test mode,...
  14. If it's an apartment why are you responsible for...

    If it's an apartment why are you responsible for repairing it. Isn't it landlords responsibility. Yes the cartridge can be replaced but the air you introduce may end up in someone else's fan coil....
  15. If it's an apartment why are you responsible for...

    If it's an apartment why are you responsible for repairing it. Isn't it landlords responsibility. Yes the cartridge can be replaced but the air you introduce may end up in someone else's fan coil....
  16. Zone dampers are motorized dampers not the volume...

    Zone dampers are motorized dampers not the volume dampers located at each branch duct. If the stats are paralleled not sure how you ever achieved any level of comfort. That's why I suggested a pro...
  17. Replies
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    2,376

    Have you checked limits? I am not 100% familiar...

    Have you checked limits? I am not 100% familiar with the model that you are referring to but I believe there is a limit input to the UCP. Jumpering the ucp heat output may be bypassing the limit. I...
  18. What does the upstairs t'stat control? Do you...

    What does the upstairs t'stat control? Do you have a second unit for the second floor? Do you have zone dampers that may not be working? Along with those questions the "O" terminal is usually used...
  19. Sorry about the problems you are having. There is...

    Sorry about the problems you are having. There is a contractor locator on this site. Circuit setters automatically adjust flow to the heatpump. This does not mean that a strainer is not plugged or...
  20. Several people have asked what is the water temp...

    Several people have asked what is the water temp but no answer. The reason they asked is because your problem relates directly to source water temperature and or flow. Simply stating flow and...
  21. what type refrigerant

    what type refrigerant
  22. Replies
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    209

    You need some type of global controller to access...

    You need some type of global controller to access them. If you have the sevice tool you can connect through that or connect it to an existing system, 24 v and communication would all you need to hook...
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    You sound motivated but working for free probably...

    You sound motivated but working for free probably won't happen due to liability. Here anyway if you are on a job you must be covered by wokmans comp and an employee. Doesn't mean you still can't...
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    I had the same argument with someone I respected...

    I had the same argument with someone I respected and was quite knowledgeable. I didn't buy his argument but it was always in the back of my mind till I read this post. He claimed that vapor pressure...
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    You are right about the old gravity systems and...

    You are right about the old gravity systems and one of the reasons the supplys were on interior walls was to keep the duct runs short. If the air cooled the less chimney effect and less heat into the...
  26. Replies
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    Commercial installations the air distribution is...

    Commercial installations the air distribution is from the ceiling. Attention must be paid to the throw of the diffuser.
  27. You said filter drier was in the discharge line?...

    You said filter drier was in the discharge line? Maybe it broke up and is plugging things.
  28. Is the bed room over a garage or conditioned...

    Is the bed room over a garage or conditioned space? Increased velocity is increase in cfm. Velocity x Area = CFM. The question remains how much cfm is actually required.
  29. Ask him for the patent number on his unique stat....

    Ask him for the patent number on his unique stat. Or the model I would love to see it.
  30. Percent retrofitted?

    Percent retrofitted?
  31. Replies
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    What do your local codes require? Why do you say...

    What do your local codes require? Why do you say old people don't get cold, I service and start up many retirement homes and they are always running at about 78f. Older folks need it warmer. The...
  32. My heart goes out to you Kefah. We hear about...

    My heart goes out to you Kefah. We hear about these things on the news but you made it very real. Keep in touch and stay safe.
  33. Thread: HVAC apps

    by ckartson
    Replies
    4
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    526

    Thanks, the narrative says good for ITunes and...

    Thanks, the narrative says good for ITunes and Iphone. I have a Samsung galaxyS4 do you think the refrigerant calculator will work with this phone? I am really really new to this or any smart one.
  34. Replies
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    Accumulated doesn't compensate for charge

    Accumulated doesn't compensate for charge
  35. Replies
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    1,626

    Use a bidirectional receiver

    Use a bidirectional receiver
  36. Thread: HVAC apps

    by ckartson
    Replies
    4
    Views
    526

    HVAC apps

    I am now in the twenty first century with a smart phone provided by the company I work for. I have been learning daily just basic functions. I know many of you use them and refer to apps in your...
  37. Static pressure should be .5"wc range. If you...

    Static pressure should be .5"wc range. If you have no static pressure control as was suggested then you will have no set point adjustment. I am unfamiliar with resi zoning systems but work...
  38. Control voltage that pulls in the contactor comes...

    Control voltage that pulls in the contactor comes from the AHU/Furnace not the condensing unit. Therefore opening the disconnect will not drop out the contactor. Power to the contactor and condensing...
  39. What type of static pressure control do you have?...

    What type of static pressure control do you have? Sounds like possibly to high causing noise through the damper. Try changing static set point (lower) see if that helps.
  40. Replies
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    95 psig suction is low for 410a. That's...

    95 psig suction is low for 410a. That's equivalent to a 29 coil Check air flow.
  41. Thread: Freezing Coil

    by ckartson
    Replies
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    2,567

    63F house is unreasonable based on normal...

    63F house is unreasonable based on normal design. As far as high side being 500 psig, what is the OAT? What subcooling do you have? During the design phase the Manual J requires indoor condition...
  42. Replies
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    Google Tinnerman nuts, they make them also.

    Google Tinnerman nuts, they make them also.
  43. Thread: Freezing Coil

    by ckartson
    Replies
    31
    Views
    2,567

    Why was the 1/4 line left in in the first place,...

    Why was the 1/4 line left in in the first place, pretty small for a three ton system. Any chance of some details besides everything seems fine. Everything isn't fine if you saw the plenum icing. Do...
  44. Replies
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    Nine year old system is not old. A system...

    Nine year old system is not old. A system properly maintained should last 20 years. A compressor replacement with all the proper safe guards like a suction filter with a follow up visit for testing...
  45. High sh, the above would give you low sh. Are you...

    High sh, the above would give you low sh. Are you sure the compressor is ok?
  46. Replies
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    606

    How many zones are you planning. 5 or less vav's...

    How many zones are you planning. 5 or less vav's is not worth it. VVT may be an option. There are many resi vvt controls systems out there.
  47. Replies
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    If the old unit was r22 and new unit is r410a...

    If the old unit was r22 and new unit is r410a then indoor coil should be replaced. That the only reason I would think it's required.
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    No double time on Sunday?

    No double time on Sunday?
  49. Replies
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    Yaskawa, they also have some excellent e learning...

    Yaskawa, they also have some excellent e learning modules on their website. Tech support is also very good.
  50. Replies
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    Both can be used for modulating application but...

    Both can be used for modulating application but yes they are different piping configurations. I was just answering the OPs question whether they can or cannot, and with a modulating actuator they...
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