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  1. Replies
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    Poll: Numbers game

    As I'm sure you have already heard, a lot of things affect SEER ratings and the actual "delivered efficiency". At the end of the discussion the only thing that really matters is how long will it take...
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    Rated at 13, may be as high as 14 or as low as 8...

    Rated at 13, may be as high as 14 or as low as 8 depending on the blower it is attached to. AC systems are just that, systems. They are more than just the condensing unit or air handler.
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    Ac system may be too large, not running long...

    Ac system may be too large, not running long enough. Or fan speed may be too high, not removing enough moisture while running. Or refrigerant charge may be off, again affecting moisture removal. ...
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    Unless you have some crazy ordinance that says...

    Unless you have some crazy ordinance that says you cant put it on the ground, put it on the ground, with a slab at least 2" larger that the unit in all directions. Don't run the slab up against the...
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    Unless you have an EPA certification to handle...

    Unless you have an EPA certification to handle refrigerant and "do this stuff" daily, I would advise against engineering your own system. Contact a reputable service company in your area that can...
  6. Step 1: Ask each contractor about Manual J heat...

    Step 1: Ask each contractor about Manual J heat gain calculations. Any that say "you don't need that, is all bs any way..." tell them thank you and have a nice day. Knowing how large (or small)...
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    As someone who also lives in a hot/humid...

    As someone who also lives in a hot/humid environment (Charleston, SC) I can say with certainty that humidity sucks!

    I have a 3300 sf house that I have installed 2 2 ton systems in and a whole...
  8. With a quick search I was able to locate the...

    With a quick search I was able to locate the attached pdf that shows the control board in your air handler's lowest setting is for a 2 ton system. Also listed are the other settings and their...
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    I was also thinking that any heat put into the...

    I was also thinking that any heat put into the water and not the house balances with the electric heat in the unit. I mean electric heat is electric, right? If the desuperheater takes enough out of...
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    Haven't actually done it, but was thinking the...

    Haven't actually done it, but was thinking the same thing about winter operation. I don't see why a relay couldn't be installed by the contractor installing the recovery unit, wire it to only run...
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    422

    Not sure of the calculations that you are trying...

    Not sure of the calculations that you are trying to get to, but a constant in a math problem is constant. What does C/W represent?
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    Replacing a duct board trunk with metal pipe, if...

    Replacing a duct board trunk with metal pipe, if all other factors are equal, will get better air flow through the duct. Keep in mind though that the air handler only moves so much air. If you make...
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    As for the root of the question, I would try to...

    As for the root of the question, I would try to isolate the conditions that are most likely to cause the noise, then schedule a service visit during that time.

    Turn on the indoor blower and let...
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    1,200

    True of today's coils, but not coils from the...

    True of today's coils, but not coils from the past. Since we have no idea of the age or model number of the existing coil, I'm guessing not rated for 300#.
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    DOE minimum at that time was 10 SEER, not 8.5. ...

    DOE minimum at that time was 10 SEER, not 8.5.

    Ruud was making 13 SEER systems at that time, I had one.

    Just because a system is 15 - 17 years old does not mean it is "due for replacement"! ...
  16. Replies
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    1,200

    You need a coil that is heat pump rated and large...

    You need a coil that is heat pump rated and large enough for the condensing unit that you are trying to use.

    Pressure rating is the main difference between hp and ac coils. Higher SEER heat...
  17. Replies
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    1,900

    After seeing the second pic, disregard the first...

    After seeing the second pic, disregard the first part of the previous answer, either location would work. I still recommend asking the installer though.
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    Leave the air handlers in the pantry, and add...

    Leave the air handlers in the pantry, and add pantry space in the garage. Placing the air handlers in the garage could introduce auto exhaust fumes and chemicals into the house.

    With the air...
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    4,307

    Kitra, there are many things we do because they...

    Kitra, there are many things we do because they are considered "best practice". Nitrogen purge is one of those things. Does that mean that a system put in without performing that practice will...
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    3,421

    Broken return spring on a 10 year old Honeywell...

    Broken return spring on a 10 year old Honeywell damper is not a cause for alarm, replace the motor when you have the $$.

    As for the failed one you have now, since the motor is removed the damper...
  21. Replies
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    4,307

    If the system is in and running, pay the bill....

    If the system is in and running, pay the bill.
    Worst case, you will have issues later that can be corrected.
    Is there a labor warranty with the new system?

    I, and many others, strongly agree,...
  22. Replies
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    Staying on topic, the system you have put...

    Staying on topic, the system you have put together is not a rated heat pump system and will not work efficiently or effectively in both the heating and the cooling modes. It can be made to work...
  23. Replies
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    2,462

    Abandoned chimney is ok, I would probably...

    Abandoned chimney is ok, I would probably recommend a permanent cap on the chimney as well, just in case someone tries to use it later.
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    9,550

    This one turned out to be dirty sensors. Didn't...

    This one turned out to be dirty sensors. Didn't realize that the metal separates form the plastic on both the water level sensor and ice thickness sensor. You have to get all of the pieces apart...
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    9,550

    Scotsman Prodigy codes

    A customer's ice machine is acting out again. Prodigy series air cooled unit mounted on a soda dispenser/ice bin. The last two errors are code 2, max harvest and code 8, short freeze. The tech...
  26. According to my duct calculator, 4 4x8 registers...

    According to my duct calculator, 4 4x8 registers won't move enough air for 3.5 tons. They. We'd to be 10 x 10, at least. Other than that, the design sounds good.
  27. Nothing bad will happen. The heat will just go...

    Nothing bad will happen. The heat will just go to the ground loop.

    I have seen units with a relay controlled by reversing valve signal. When in heat mode desuperheat pump is not allowed to run.
  28. All other things being correct in the system i...

    All other things being correct in the system i would say no. Have the system inspected to make sure refrigerant lines are run correctly, and are sized correctly, the duct system is adequate and fan...
  29. Replies
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    As it was explained to me some years ago, the...

    As it was explained to me some years ago, the returns were put on the perimeter in a heating dominant environment so the furnace would draw the warm air toward the heating load, not from the heating...
  30. Replies
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    Unless the thermostat fan switch is set to on the...

    Unless the thermostat fan switch is set to on the fan should stop 1to 2 minutes after the outdoor unit. If the fan runs more than 2 minutes check the thermostat then have installer check the blower.
  31. Replies
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    1,091

    Dual fuel indicates that the heat is generated by...

    Dual fuel indicates that the heat is generated by two fuels. One is gas, the other is electric (through the heat pump). A conventional AC removes heat from the house and expels it into the yard. A...
  32. Replies
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    1,091

    The most important question to ask the potential...

    The most important question to ask the potential contractor: How will you determine the correct equipment size? Answer: ACCA approved manual J calculation.

    Research your area and find a...
  33. Replies
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    1,091

    The AC/HP coil will be placed in the duct after...

    The AC/HP coil will be placed in the duct after the furnace. The air will still be moved using the furnace blower through the AC coil and into the duct system.

    An air handler, or electric furnace...
  34. Replies
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    1,091

    Again keep in mind pricing is regional, but in my...

    Again keep in mind pricing is regional, but in my area where heat pumps are normal equipment, the installed cost difference between an ac unit and a heat pump unit is minimal. When adding a heat...
  35. Replies
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    Furnace sizing is not as critical, since an over...

    Furnace sizing is not as critical, since an over sized furnace won't cause moisture/mold/humidity issues like an over-sized air conditioner. An over-sized furnace will simply cycle on and off more...
  36. Replies
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    1,091

    The price you have listed (that will no doubt be...

    The price you have listed (that will no doubt be removed, as pricing is not supposed to be discussed) seems high for an install that does not include the furnace in my area. This is the reason that...
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    Would love to test it for you. I would have PM'd...

    Would love to test it for you. I would have PM'd as requested, but can't find a way to do it. Also would have emailed, put no public profile info!
  38. Having not installed a york system with that...

    Having not installed a york system with that controller, I can only pull from other dual fuel control systems that I have installed. In those, I had to set the balance point between heat pump and...
  39. Replies
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    According to Honeywell tech data, the TH6000...

    According to Honeywell tech data, the TH6000 series relies less on temperature difference and more on cycles per hour to determine staging. I usually use 3 CPH for the compressor, and 9 CPH for aux...
  40. Page 29 describes static pressure measurements. ...

    Page 29 describes static pressure measurements. Your unit can handle the filter, IF the filter and duct system is designed correctly and the new filter is not a significant pressure drop. Have the...
  41. I agree with 3 to 4 zones. And with forced air,...

    I agree with 3 to 4 zones. And with forced air, small zones are not as much a problem with proper by-pass and supply/return temp sensors. None of these should be optional in my opinion.
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    Is it possible that the temp sensor got moved? I...

    Is it possible that the temp sensor got moved? I would expect to see a 30* sensor on the leaving water line, but if it was moved to the inlet side, the coil would have to freeze and stop all flow...
  43. The foil bubble bubble foil set up is not going...

    The foil bubble bubble foil set up is not going to gain a lot. It is very similar to a product introduces to get r-8 insulation value on duct systems. In order to get that value, the product could...
  44. Replies
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    Smaller furnace has higher pressure drop across...

    Smaller furnace has higher pressure drop across furnace section?
  45. A quick search reveals that a Hart Cooley 406...

    A quick search reveals that a Hart Cooley 406 register has 32 square inches of free area, while a wood register from http://www.volko.com/oakbasevents.htm has only 24. Simple math (and it is not...
  46. Replies
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    Could be manufacturer specific requirements. Same...

    Could be manufacturer specific requirements. Same sequencer design is used by many OEM's and supplied by a 3rd party supplier.
  47. Replies
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    Is this a replacement system that is louder than...

    Is this a replacement system that is louder than the original? If so the original unit may have had reciprocating compressors. Scroll compressors are a different type of noise. Not necessarily...
  48. Replies
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    Code requirements are 6" per 1000 btuh or 72" per...

    Code requirements are 6" per 1000 btuh or 72" per ton. 144 would be great, as most of what I see here are smaller than the 72" requirement.

    Either way, return duct size will not cause a negative...
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    Though logical, it is wrong. All this indicates...

    Though logical, it is wrong. All this indicates is that there is an air leak at that location that the blower is able to pull from. Air will find its easiest path to travel. Even if you had 2x the...
  50. Replies
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    Any digital thermostat, programmable or not, that...

    Any digital thermostat, programmable or not, that is unit powered will need 3 wires unless it is a "power-robing" thermostat. A battery operated thermostat, programmable or not, can use the 2 wires.
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