Results 1 to 11 of 11
  1. #1
    Join Date
    Aug 2002
    Posts
    391
    When taking a amp. reading to set your heat anticipator on a T87 should the t stat be in or out of the circut. I am looking a a diagram of the procedure and it is not clear where they are taking the reading.
    Is the setting for a Taco zone valve .9
    The obvious is obvious

  2. #2
    Join Date
    Jun 2003
    Location
    Florida
    Posts
    9,548
    All the stat is is a switch, so I'd just measure it either way as long as the units running. Don't know about the Taco valve.
    If everything was always done "by the book"....the book would never change.

  3. #3
    Join Date
    Apr 2004
    Posts
    7,680
    you would jump R and W at the thermostat. On a t87, you cant do that with the stat connected to the subbase.

    Taco zone valves generally were .9 last time I did one.

  4. #4
    Join Date
    Jun 2003
    Location
    Florida
    Posts
    9,548
    Can't you take your reading at the furnace with the stat on? Seems to me it doesn't matter as long as it's running and drawing control voltage....
    If everything was always done "by the book"....the book would never change.

  5. #5
    Join Date
    May 2005
    Posts
    428
    1- remove red stat wire from r termenal
    2-put one end of ten loop on r term
    3- put other end of ten loop on w term
    4- furnace should start now
    5-now measure amp draw
    6-this will be your anticipater setting
    7-AND HAVE A NICE DAY

  6. #6
    Join Date
    Jun 2003
    Location
    New Hampshire
    Posts
    2,666
    Set the heat anticipator at .9 then you're done.
    I never check the current draw and don't have problems with them.

  7. #7
    Join Date
    May 2005
    Posts
    428
    check with stat out of circuit or you will fry the stat

  8. #8
    Join Date
    Feb 2004
    Posts
    2,458
    Originally posted by hvacguy1075
    check with stat out of circuit or you will fry the stat
    I've set hundreds and never smoked a tstat. Please explain. Done with tstat in circuit and out.

  9. #9
    Join Date
    Aug 2002
    Posts
    391
    I asked because a diagram that I saw was confusing and I was unable to locate any specific information on the net. I would think that if you measured with the t-stat in the loop the heat anticipator which is a resistor would affect the amp draw.
    The obvious is obvious

  10. #10
    Join Date
    Nov 2005
    Location
    BAKERSFIELD CA.
    Posts
    78
    get rid of the t87 and put in a good digital stat you wont have to worry about the heat anticapator setting and youll have a more accurate reading on the room temp. But if your gonna keep it just jump R to W at the subbase and get the reading there if you jump it at the unit you may not get the correct reading do to the resistance of the wire to the subbase not being measured

  11. #11
    Join Date
    Nov 2005
    Location
    BAKERSFIELD CA.
    Posts
    78
    get rid of the t87 and put in a good digital stat you wont have to worry about the heat anticapator setting and youll have a more accurate reading on the room temp. But if your gonna keep it just jump R to W at the subbase and get the reading there if you jump it at the unit you may not get the correct reading do to the resistance of the wire to the subbase not being measured and you really dont need a ten rap just a good meter

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