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  1. Tsat control of fan speed on a single-stage, variable fan-speed system

    Just installed a new Rheem single stage cool/ dual stage heat system and Tstat upstairs - don't have specifics since I'm at work, but only need general advice.

    Currently, when cooling starts, fan...
  2. Do you mean the rertun filter(s) in the house, or...

    Do you mean the rertun filter(s) in the house, or is there a filter in the unit itself that requires changing?
  3. Anyone else have an opinion? I woud like to know...

    Anyone else have an opinion? I woud like to know if my picture looks like something that you professionals see regularly, and what you recommend to the homeowner to do about it, if anything. To be...
  4. How is the indoor air affected by the outer...

    How is the indoor air affected by the outer housing of the blower? Is air drawn across the blower housing? The evap coil looked fine - no mold.

    The access panels are removable with screws, so how...
  5. Does mold on the surface of an outdoor blower...

    Does mold on the surface of an outdoor blower necessarily mean that mold is also in the ducts, etc? Is it possible that the mold is just due to outdoor humidity, not indoor?

    What do you mean by...
  6. Mold on blower housing - is this a problem? (picture)

    This is a picture of the blower of my outdoor Trane duel-fuel unit. I live in NC. The unit is in our back yard. My HVAC tech says this is a concern and that a UV light thing would help control it....
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    Is this dirty sock syndrome? Please help.

    We have a Trane Dual-Fuel unit. When the heat pump runs, it gives off a sweet, musty smell. It only smells when the heat pump runs - once the gas heat kicks in, it's gone. I have tested this by...
  8. Anyone?

    Anyone?
  9. "Dirty Sock" in a dual-fuel unit - questions

    I have a two year old Trane XL14C dual-fuel package unit. Last year, I started getting the dreaded "dirty-sock" smell when the heat pump kicked-in in the fall. When the gas heat kicked in, no smell....
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    I purposely didn't post the actual price quotes...

    I purposely didn't post the actual price quotes of the warranties, just the difference in the price since it's relevant to the question. (Even that figure was not actual). That's not allowed?
    ...
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    Trane parts-only extended warranty.

    I have a Trane XL14c Dual-Fuel system - installed one year ago. Didn't buy an extended warranty then - considering it now.

    A 10 year parts-only warranty is about 1/3 the cost of the parts/labor ...
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    I'll try to get a photo today or tomorrow. I...

    I'll try to get a photo today or tomorrow. I don't have a pdf of the Service Facts, but it shows it right in there. If you have access to the Service Facts for the XL14c (4DCY) take a look at it.
    ...
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    100% sure - I took off the access panel and...

    100% sure - I took off the access panel and looked (didn't touch!). There are W1, W2, W3 terminals on the ECM Fan Control board. There is a white wire in both the W1 and W3, nothing in the W2. The W1...
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    Just for clarity, the three stages I refer to...

    Just for clarity, the three stages I refer to are:

    Stage 1: heat pump
    Stage 2: low fire gas (stage 1 gas)
    Stage 3: high-fire gas (stage 2 gas)

    As I understand it, the corresponding terminals...
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    Anyone willing to help me out? I'm meeting with...

    Anyone willing to help me out? I'm meeting with the tech on Monday, so hopefully he'll know, but he didn't inspire much confidence the last time he was here (tried to say everything was working...
  16. So for my crawl - 1700 sq ft, avg ht 3 feet, so...

    So for my crawl - 1700 sq ft, avg ht 3 feet, so 5100 su ft - would the Compact suffice? Humidity in July/August is about 75-80% down there.
  17. Thanks for taking the time to respond TB. I'm...

    Thanks for taking the time to respond TB. I'm going to go with the Santa Fe as it is a more proven product and worth the extra cost IMO.
  18. Replies
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    Trane Dual Fuel Wiring question (not DIY)

    I have a trane XL14c Dual Fuel unit with 3 stage heat (heat pump, low fire gas, high fire gas). It is wired to a Honeywell HZ432 zone panel (2 zones). I notice that the W1 wire is connected from the...
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    Thanks for the replies. I found it.

    Thanks for the replies. I found it.
  20. Replies
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    Service Facts for Trane XL14c (4DCY)?

    I'm trying to locate the Service Facts for the Trane XL14c (4DCY4036A). i've found many other Service Facts for other Trane models online (4WCY,4TCY, etc.) but can't seem to locate it for the 4DCY....
  21. Got the pint info from here:...

    Got the pint info from here: http://www.energystar.gov/index.cfm?c=dehumid.pr_basics_dehumidifiers

    Crawl space is currently over 80% RH.

    TB - I would like to know your opinion on the following...
  22. Opinion on Dri-CrawlSpace dehumidifier (vs. Santa Fe)?

    Posted this in Residential HVAC, but think it might better here:

    Can't find many reviews or opinions on this this thing except what's on their website: http://www.crawlspacedehumidifiers.com
    ...
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    Opinion on Dri-CrawlSpace dehumidifier?

    Can't find many reviews or opinions on this this thing except what's on their website: http://www.crawlspacedehumidifiers.com

    Wondering how it compares to the Santa Fe Advance for my 1700 sq ft...
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    I'll guess I'll see what the bypass does after...

    I'll guess I'll see what the bypass does after they fix the damper. I don't want to be a PIA to the tech unnecessarily, so for clarity - with both zones fully open, absolutely no movement of the...
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    So are you saying that the bypass damper...

    So are you saying that the bypass damper shouldn't move at all with both zones open? It moves literally about 5 degrees max (fully open being 90 degrees) - just a slight movement. Should I expect...
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    I believe damper is stuck partially open, since...

    I believe damper is stuck partially open, since it doesn't blow quite as hard at the registers in that zone. Bypass only opens very slightly right now - barely moves. Tech said that's normal.
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    The interesting thing is that one of the dampers...

    The interesting thing is that one of the dampers is defective (stuck open), so really the system is one big zone right now, meaning the plenums will be even colder when they fix the damper and the...
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    Wow - quick replies - thanks! It was leaking...

    Wow - quick replies - thanks!

    It was leaking from the pressure regulating duct (zoned system) where it connects to the supply plenum, but that was fixed. There MAY be a slight leak or two where...
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    Should I insulate my sweating supply plenum?

    My crawl space is averaging 72% humidity right now (Raleigh, NC). I don't see any mold or mildew on the joists, the floor insulation is dry, and there is no condensation anywhere - EXCEPT the supply...
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    I'm in North Carolina, so yep - pretty humid down...

    I'm in North Carolina, so yep - pretty humid down there right now. And yes - it is duct lined - 2 zone ducts, bypass duct, and return duct.

    Tech's coming next week - thanks for all the info and...
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    It's not just a little condensation - the whole...

    It's not just a little condensation - the whole plenum is covered with condensation, and there is actually a small pool of water under it now, though not a flood.
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    Is that a requirement? If so, I'll be sure to...

    Is that a requirement? If so, I'll be sure to advise the tech as such.
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    Don't know - how would I measure it? Of coil...

    Don't know - how would I measure it?

    Of coil is too cold, can that be adjusted on the AHU?
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    What are the consequences of consensation if I...

    What are the consequences of consensation if I don't insulate the plenum?
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    My plenum is sheet metal and is NOT insulated -...

    My plenum is sheet metal and is NOT insulated - should it be? Only the ductwork is insulated.
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    Yes, no, and not really. Maybe I'm dense, but...

    Yes, no, and not really.

    Maybe I'm dense, but just making sure - it is normal, correct?
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    How about on the plenum in a crawl space? Our new...

    How about on the plenum in a crawl space? Our new system has slot of condensation on the plenum. Is that normal?
  38. This is straight from the HX432 install manual: ...

    This is straight from the HX432 install manual:

    "The DS/BK terminal is used with a variable-speed fan. Connect the DS, BK, ODD, or DHUM terminal on the HVAC equipment to this terminal. When 1 zone...
  39. I didn't open or mess with anything. I just...

    I didn't open or mess with anything. I just looked at it. I think I'm entitled to do that after spending thousands of dollars.
  40. Variable speed fan wiring/settings questions ...

    System: VisionPRO IAQ t-stats, Trane XL14c Dual Fuel, Honeywell HZ432 TrueZONE Panel

    - The install instructions for the HZ432 say to wire the AHU to the DS/BK terminal. I've checked and nothing is...
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    Variable speed fan wiring questions...

    oops - wrong thread.
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    oops - double post.

    oops - double post.
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    I assume that means that I'm fine with that...

    I assume that means that I'm fine with that set-up? :)
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    Here's the link to the dtas manual:...

    Here's the link to the dtas manual: http://www.bayareaservice.com/Manuals/dats.pdf. I believe Fig. 2 shows the dtas installed in the bypass duct.

    The HX is actually in the AHU, correct? If so,...
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    I'm out of town this week - will post pics upon...

    I'm out of town this week - will post pics upon return.

    The manual for the dtas shows it installed in the bypass duct: will post manual link later.

    Why would you move it? Where is it normally...
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    What is the plenum? From razorwit's reply, it...

    What is the plenum?

    From razorwit's reply, it sounds like it hasn't been installed properly. What's the general consensus - is it an acceptable install or something I should insist be changed?
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    Supply plenum - that's the silver box, correct? ...

    Supply plenum - that's the silver box, correct?

    If so, then yes - both the bypass damper and the dtas, as well as the zone dampers, are all installed in the supply plenum. On the plenum, the...
  48. DOH! Should've read the manual first. Thanks!

    DOH! Should've read the manual first. Thanks!
  49. Replies
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    Bypass damper & DATS installed incorrectly?

    I noticed that the bypass damper on our new system (2 zone) is installed downstream of the zone dampers (only a foot or so after, but still after). The instructions say to install it upstream of the...
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    Okay, I think I just misunderstood. The M847D1012...

    Okay, I think I just misunderstood. The M847D1012 is a replacement for the m847d1004 if it needs replacing. The m847d1004 is still the actuator that comes with the ARD damper.
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