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  1. VisionPRO IAQ w/ Y8150/W8150 Fresh Air System

    I have a new 2-story house in Florida. It has two Bryant single-stage heat pump systems (one per floor) with each system having a Honeywell Y8150/W8150 fresh air ventilation system and basic...
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    As a rule of thumb, from an operating and comfort...

    As a rule of thumb, from an operating and comfort standpoint, it is always better to have more smaller systems. Initial installation will be more expensive, however you get the reliability of two...
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    Appears to be a very thorough bid! Two things I...

    Appears to be a very thorough bid! Two things I would inquire about: using a heat pump instead of a straight cool unit. This will give you a "dual-fuel" unit. And unless you specifically didn't want...
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    How much heat do I need to accommodate for in the...

    How much heat do I need to accommodate for in the load calcs from these ventilating dehumidifiers?
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    3,960

    What is the fresh air ventilation capacity of the...

    What is the fresh air ventilation capacity of the Ultra-Aire XT150H? How many cfm's?
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    3,960

    I think I am going to take your advice and...

    I think I am going to take your advice and seriously look at a whole house ventilating dehumidifier. For 3700 sq. feet, should I look at using one Ultra-Aire XT150H for the whole house or should I...
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    House will be 3700 sq. feet, two story. Total of...

    House will be 3700 sq. feet, two story. Total of 3 baths (one downstairs, two up). Was going to install ERV on upstairs system. I was originally thinking about using a 200 cfm ERV so I could...
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    Using Ebay as a guide, a whole house dehumifier...

    Using Ebay as a guide, a whole house dehumifier appears to roughly 2x the cost to of an ERV. You then still have to install bath fans.
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    I was actually planning on using a 200 cfm ERV...

    I was actually planning on using a 200 cfm ERV with 100 cfm each from two bathroom. Florida Mech. Code requires a minimum of 50 cfm of exhaust per toilet and shower.
    I like the idea of using a...
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    Nice looking install. Good looking metal work...

    Nice looking install. Good looking metal work too! How does the Lennox Icomfort stat compare to the Carrier Infinity stat?
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    This is exactly what I want. Is this level of...

    This is exactly what I want. Is this level of control available with the Carrier ERV's? I am planning on having a Carrier Infinity air handler with the Inifnity controls.
  12. Forgot to mention that I am planning on having...

    Forgot to mention that I am planning on having (budget permitting) a 200cfm ERV for the 2nd floor with the exhaust from the bathrooms.

    I originally wanted a 2-stage system for the 1st floor but...
  13. I've been over and over the inputs for the 2nd...

    I've been over and over the inputs for the 2nd floor and the Bonus room and every things seems correct. And though the 2nd floor is almost twice the sq. footage, both areas have the same number of...
  14. New Construction A/C size recommendation

    I downloaded HVAC Calc and ran the loads on my new house which is currently under design. It is a two story Craftsman style house in Tampa. Concrete block construction on first floor, 2x6 wood frame...
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    Why are the proposed Trane systems 3 tons each...

    Why are the proposed Trane systems 3 tons each while the Carriers are 2 tons each? would be interesting to see each of the contractor's Manual J calculations to compare.
  16. I'm in Florida too and we had one helluva hot...

    I'm in Florida too and we had one helluva hot summer. My electric bills were higher than they have ever been. That being said, what was the SEER on your old system? I'm guessing it was either 10 or...
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    Working with my house designer, she recommended...

    Working with my house designer, she recommended using 20" deep floor joists to give us plenty of room to route ductwork. Does anybody know how large of a duct will fit through the webs on a 20" deep...
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    Best way to control ERV

    In the planning stages of designing a new home in Florida. Will be using heat pumps with VS air handlers (possibly Carrier Infinity system). Would like to install an ERV for fresh air. I am a...
  19. You will definitely want to "oversize" compared...

    You will definitely want to "oversize" compared to a ducted return air system to keep your pressure drops down. The easiest solution, if you have a grid type lay-in ceiling system, is to just use...
  20. Thanks for the update. I just checked Carrier's...

    Thanks for the update. I just checked Carrier's website and it appears you are correct. The programmable version of the Edge thermostat does control humidity by using the variable speed fan in the...
  21. If you go with the Performance system, use the...

    If you go with the Performance system, use the Carrier "Thermidistat" in lieu of the "Edge" thermostat. The Thermidistat will work with the variable speed air handler to control humidity. I have a...
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    Thanks for the good ideas on designing the floor...

    Thanks for the good ideas on designing the floor trusses with leave-outs for ductwork.

    I believe the Florida mechanical code already requires a "balanced return air" which means return air drops...
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    Thanks for the feedback. I guess I could have...

    Thanks for the feedback. I guess I could have clarified a bit more. This will be a slab on grade home, no basement (Florida). The initial thought is to use spray foam attic insulation and install the...
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    Duct routing on 2-story home

    We are in the planning stages of building a new 2-story home in Florida. We will probably go with heat pumps, one system per floor. The house will most likely be concrete block construction for the...
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    Yes, that is the "magic" with a two-speed system....

    Yes, that is the "magic" with a two-speed system. Think about how you drive your car. You accelerate up to a certain speed in low gears, then maintain your speed in high gears. When you need to...
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    How is the temperature in your house? Is the a/c...

    How is the temperature in your house? Is the a/c able to maintain the setpoint on the thermostat? It sounds like to me you have too much cfm for a 2-ton heat pump. Typically you see around 400 cfm...
  27. I'd inquire about using a Carrier 58CVA090-14...

    I'd inquire about using a Carrier 58CVA090-14 furnace. It has a 4-ton blower motor, but the furnace is much smaller at 90k btu input. Probably still oversized, but not to the degree the 58CVA135...
  28. Why is your installer using a 5-ton air handler...

    Why is your installer using a 5-ton air handler matched with a 3.5 ton condensing unit? I don't see the reason, especially since he is setting the dip switches for air flow at 3.5 tons. Why not just...
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    Typical indoor summer relative humidity levels in...

    Typical indoor summer relative humidity levels in Florida are around 55%. The 63% in your home seems high. Why do you have a 5-ton air handler with a 3.5 ton condensing unit? The larger coil is...
  30. Thread: WTF 2

    by florida pe
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    4,077

    The door to the closet is open and now can't be...

    The door to the closet is open and now can't be closed due to the air handler being in the way.

    By the way, that is not a stat wire running through the condensate line, that is the wiring for the...
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    The 4-ton system on the first floor seems to be...

    The 4-ton system on the first floor seems to be sized appropriately, however, the 2.5 ton system on the 2nd floor seems a bit oversized. However, keep in mind that the tonnage ratings on your systems...
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    Being in Florida, I can help answer some of your...

    Being in Florida, I can help answer some of your questions. I would install a humidistat in your A/C system to maintain a max RH of 60% when the home is unoccupied. I would let the humidistat drive...
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    I would keep it simple and go with two heat pump...

    I would keep it simple and go with two heat pump systems. One for the east areas of the house and one for the west areas. With a single story home, you won't experience the wide temperature...
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    I live in the Tampa area and have a gas furnace...

    I live in the Tampa area and have a gas furnace (neighborhood has natural gas). You will find it heats the house up rather quickly. This is due to it being quite oversized, which is common when you...
  35. Thread: SPIRAL DUCT

    by florida pe
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    Sometimes restaurants leave their exterior doors...

    Sometimes restaurants leave their exterior doors open and when the warm outside air hits the exposed cold ductwork, condensation can ensue. I've seen restaurants/bars with non-insulated spiral...
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    It appears to be a fresh air duct. Hopefully, it...

    It appears to be a fresh air duct. Hopefully, it is pre-treated (i.e. dehumidified in the summer, heated in the winter). I'm surprised it is not directly connected to your a/c system. Your condo must...
  37. I would imagine the heat pump costs include...

    I would imagine the heat pump costs include heating and cooling.
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    How is that piped? Variable speed primary? Or is...

    How is that piped? Variable speed primary? Or is there two loops there? Kind of hard to tell from the picture. How many tons? Looks to be about 60 or so.
  39. There is really no advantage to the Infinity...

    There is really no advantage to the Infinity furnace if you don't install the Infinity thermostat to match. I believe the Performance series still has a variable speed fan, which is the main...
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    It always amazes me how sheet metal ductwork is...

    It always amazes me how sheet metal ductwork is used in most homes up north. In Florida, we struggle to get sheet metal use on a light commercial project, much less a residence. All residences down...
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    A typical friction loss for a supply duct is...

    A typical friction loss for a supply duct is 0.08" per 100 feet while a return duct is lower at 0.06" per 100 feet. Are you going to be running a main trunkline the length of the your basement with...
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    That sub used to be here in Tampa. I toured it as...

    That sub used to be here in Tampa. I toured it as a kid. I don't recall if it had a/c then.
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    VTAC manufacturers

    I have the design of a 34-story condo project starting up and the initial design idea is to use VTAC units in the condos. It would eliminate refrigerant lines and also eliminate the use of a central...
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    I knew it sounded familiar. I work there,...

    I knew it sounded familiar. I work there, however, another engineer handled the design.
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    3,445

    It sounds familiar. Who was the engineering firm?

    It sounds familiar. Who was the engineering firm?
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    3,445

    What building in Brandon is that? I live in...

    What building in Brandon is that? I live in Brandon.
  47. Just curious, why does Trane list a "62" and a...

    Just curious, why does Trane list a "62" and a "65" model with the same capacities and dimensions?
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    Not sure where you are at, but here in Florida...

    Not sure where you are at, but here in Florida the minimum R-value for ducts installed in an attic (or any unconditioned space) is R-6. Was your ductboard existing and you added a zoning system? If...
  49. 16 guage metal straps at each corner. The straps...

    16 guage metal straps at each corner. The straps should be attached to the pad with 1/4" tap-cons and attached to the unit with tek screws.
  50. If you pour a slab, you can strap the unit to it...

    If you pour a slab, you can strap the unit to it for better wind resistance, which is required now in Florida.
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