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  1. Replies
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    It will more or less fire immediately in stage 2.

    It will more or less fire immediately in stage 2.
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    I would still tell you to get an outdoor temp...

    I would still tell you to get an outdoor temp sensor...
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    Only initially when the stat is "adjusted" to 2...

    Only initially when the stat is "adjusted" to 2 degrees or more above the current set temp will aux heat come on. once it reaches the set point, it will not use aux heat very often, only if the stat...
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    First of all, I would highly suggest installing...

    First of all, I would highly suggest installing an outdoor temp sensor, as that will eliminate all of your issues. I know it has been said before on this thread, but that is truly the only way for...
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    Honeywell doesn't offer anything like that...

    Honeywell doesn't offer anything like that...
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    3,104

    Everything internally to the stat will take care...

    Everything internally to the stat will take care of the CPH, that isn't causing this. when you set your CPH to 3, the stat knows how much time is required to maintain the +/-1 (if you search rog09,...
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    Please post all of your settings pertaining to...

    Please post all of your settings pertaining to Dual Fuel. If it is setup correctly for Dual Fuel and it is set for balance point only, it will not call the Aux for any reason above that if the 2...
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    The stat does not have a slab sensor and using...

    The stat does not have a slab sensor and using the existing indoor air sensor won't work as a slab sensor (different algoritms, type of sensor, etc is needed)
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    The VP IAQ hum sensor is "spec'ed" to +/- 5%, but...

    The VP IAQ hum sensor is "spec'ed" to +/- 5%, but in reality it typically is +/- 1%. There is a calibration in the product if there are differences throughout a home (e.g. the stat is located in a...
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    Vp Iaq Led

    In VP IAQ, the L terminal is only an input. Therefore, the only time you will see the red LED illuminate is when there is 24V on the line (e.g. a HP monitor that senses a fault condition and closes...
  11. Thread: Thermostats

    by rog09
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    1,135

    has anyone ever thought about making a sticky out...

    has anyone ever thought about making a sticky out of this two-stage furnace and single stage stat issue? Then each time a homeowner or contractor asks we could just forward them to that area where...
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    RE: sensor location It is very important where...

    RE: sensor location

    It is very important where you locate the remote sensor. The best bet is to find a place out of the sun where it can get some of the breeze. Typically, the best place to...
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    As mentioned above, the overcooling can be...

    As mentioned above, the overcooling can be adjusted. It can be set to overcool by 1, 2 or 3 degrees. Or, as indicated above, it can be set to 0 degrees and it will simply lower the blower speed...
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    Not exactly an anticipator setting, as it uses...

    Not exactly an anticipator setting, as it uses P+I control for staging. However, for longer run times, the CPH could be turned down and/or the "heat aggressiveness" could be turned up, but that will...
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    The VP IAQ (or VisionPRO 9000) requires only an...

    The VP IAQ (or VisionPRO 9000) requires only an outdoor temperature sensor to control all of the dual fuel capabilities. It makes installing the heat pump easier (it is a two piece solution that...
  16. Thread: Honeywell T4600?

    by rog09
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    690

    The stat will handle up to 4 stages of heat and 2...

    The stat will handle up to 4 stages of heat and 2 stages of cool...plus humidification, dehumidification and ventilation. The controls for dual fuel are also better than anything on the market, so...
  17. As already suggested, the VisionPRO is a superior...

    As already suggested, the VisionPRO is a superior stat to the 9715i. Depending on the install you are doing, I would highly recommend getting the VisionPRO IAQ (p/n YTH9421C1002). The stat will...
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    vibration - if you read through this thread and...

    vibration - if you read through this thread and search for "CPH" or "cycles per hour" you will find an in-depth discussion of what it does
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    dhh ...

    dhh

    http://customer.honeywell.com/Techlit/pdf/68-0000s/68-0287.pdf

    Go to page 32. That is the most we can legally say about P+I control and there is a diagram that better explains how it...
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    If you had a good contractor you wouldn't have...

    If you had a good contractor you wouldn't have had to worry about asking questions b/c he would have done it right the first time...hence why we are here to attempt to help. The more of the industry...
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    I talked with a guy that now works for us that...

    I talked with a guy that now works for us that used to install Carrier and he said he knew nothing about those heat pumps that would preclude you from installing a new VP IAQ or some other newer...
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    "wires" is referring to the number of wires that...

    "wires" is referring to the number of wires that came in the "bundle". in your case, five.

    what are the four wires connected to? you should have...

    power
    cool
    heat
    fan
    common - it is...
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    You're gonna love this one... "Facts" 1-5 1....

    You're gonna love this one...

    "Facts" 1-5
    1. untrue from how it controls it. that is how 'droop' stats work, not droopless. true that there is no 'mystery' behind how it works...unless you call...
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    When the defrost cycle runs, the unit goes into...

    When the defrost cycle runs, the unit goes into cooling mode...

    In very simplistic terms (not actually how it works but general concept), when the cool is on, the unit takes heat (and moisture)...
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    if you already own both, the functionality is...

    if you already own both, the functionality is going to be somewhat similar. the 6220 will get you a 5 year warranty and tech help from professionals, whereas the retail version will require help...
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    [/B] Yup. Lots of great theory on how...

    [/B][/QUOTE]

    Yup. Lots of great theory on how a generic 'stat might work, sort of. But still no hard facts regarding how exactly CPH is dealt with.

    The TH6110 is clearly not a simple on/off...
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    calster1... your question of lower CPH = greater...

    calster1... your question of lower CPH = greater energy efficiency is true. theoretically, it takes some amount of time for the furnace to heat up...this means that you will be wasting some amount...
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    dhh - do you still have questions of how a HON...

    dhh - do you still have questions of how a HON stat determines when to turn on and off?
  29. Replies
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    Whether you need to replace the outdoor stat...

    Whether you need to replace the outdoor stat depends on what you have outside, as you have mentioned that your contractors have installed multiple stats inside and out (which is odd that they put in...
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    is this a dual fuel system or is it heat pump w/...

    is this a dual fuel system or is it heat pump w/ elec aux?
  31. Replies
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    Honeywell makes a product called DH90 that is a...

    Honeywell makes a product called DH90 that is a 90 pint dehumidifier that also has a 70 cfm ventilator built in...you can't "balance" (set your house so that the amount of air coming in matches the...
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    I would certainly suggest getting away from the...

    I would certainly suggest getting away from the 1F78 stat. This is an "economy" stat and you are certainly not installing an "economy" furnace. I agree with BaldLoonie that using a VisionPRO IAQ...
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    Just got a callback from a colleague of mine who...

    Just got a callback from a colleague of mine who stated that there is no "logic" built into the Evolution module...when using the non-Evolution control it is simply a 'dumb' terminal and a...
  34. Replies
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    I would start a new post for this and talk about...

    I would start a new post for this and talk about the current operation of the system. Scrap this CPH heading and say something like "Bryant Evolution Furnace running for 16 minutes with 10 degree...
  35. Replies
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    Let me understand exactly what you are saying......

    Let me understand exactly what you are saying...

    On the stat display, you see the setpoint and the current temp as exactly the same, and the system still runs for how long?

    Also, what is the...
  36. Replies
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    Sorry...missed the EAC portion, you should be...

    Sorry...missed the EAC portion, you should be covered (assuming you keep the pre-filter replaced and clean the EAC 1-2x/yr)...

    Pressure drop shouldn't be an issue...certainly does sound like too...
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    You definitely need the static pressure checked. ...

    You definitely need the static pressure checked. Also, if you do add the Evolution control and the static pressure isn't correct (e.g. too much pressure drop as it sounds like you have with your 1"...
  38. Replies
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    Two things... 1. I do not know what the...

    Two things...

    1. I do not know what the Bryant has built into its control module as far as PI/PID...you will have to find a Bryant expert (most likely at the manufacturer level or one of the...
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    I completely agree that we are both right, as...

    I completely agree that we are both right, as 'other' stats work exactly as you explained with the temperature differential between the stages and the timing.

    I would disagree with you about...
  40. Replies
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    This is going to be interesting, as I am going to...

    This is going to be interesting, as I am going to attempt to draw a curve on this thing...CPH is the vertical axis and load is the horizontal axis.


    CPH
    3xxoooooooooooooooXXoooooooooooooooo
    ...
  41. Replies
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    This is to DeltaT's post...I agree with most of...

    This is to DeltaT's post...I agree with most of the above, except the "waiting" time for the next call. How the Honeywell stat works (I am not speaking for all stats here), it that there is no...
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    If the guys don't know what product to look for,...

    If the guys don't know what product to look for, tell them the part number is YTH9421C1002.

    There are three wires that go from the equipment to the t-stat. Then, from the equipment, there is a...
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    I think the Infinity/Evolution system works on...

    I think the Infinity/Evolution system works on four wires, but I am not positive of that.
  44. Replies
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    Alright, I am not replying again for a few...

    Alright, I am not replying again for a few minutes until I see any of your responses propagate through the board...it does sound like you understand single stage/multistage Honeywell stats. I...
  45. Replies
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    Not exactly a simple PID as you indicate, but the...

    Not exactly a simple PID as you indicate, but the concept is the same. In the single stage stat, the P+I, CPH and house characteristics allow the Honeywell stat to control temperature at a much more...
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    Hopefully my last post will answer these...

    Hopefully my last post will answer these questions. There is no communication between the stat and the furnace...the stat is making a call and the furnace is upstaging based on time.

    In reference...
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    This is a debate with many professionals. A 90%+...

    This is a debate with many professionals. A 90%+ furnace should always be 3, as the warm up time makes it inefficient to run at 5. An 80% furnace can operate at either setting...5 will give you...
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    Final one on the t-stat... A portion of your...

    Final one on the t-stat...

    A portion of your issue is that you have a single stage stat attached to a multi-stage system as mentioned before in this post. If you upgrade the TH6110 to the TH6220,...
  49. Replies
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    Now, from a staging perspective... Setting the...

    Now, from a staging perspective...

    Setting the system to 6 CPH is essentially 'solving' the high speed issue as at 50% load, the system would only run a maximum of 10 minutes (at different loads...
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    Alright, to start from the beginning...multiple...

    Alright, to start from the beginning...multiple postings

    CPH (heat cycles) should be set to 3 for your system. Running the system at 6 is considerably too much cycling for a 94% efficient system...
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