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  1. #1
    Join Date
    Jan 2019
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    What model is this thermostat

    Hello. Need to replace some thermostats, and cannot for the life of me track down a model number for some our existing ones. This is a commercial system. We have four units, each with a separate thermostat. Two of the thermostats are Siemens 540-660A, but the other two I cannot identify, and they have no clear model number marked on them (all of the numbers that I find pull up nothing similar in an internet search). Pictures attached.

    They are marked outside as "Powers," and inside as "Landis & Gyr Powers, Inc." They are definitely electric, not the almost identical looking Siemens pneumatic ones (192-254). Various numbers inside mostly don't match up from one to another, other than 535-998 stamped in one place on both. Stickers on one say 819 and A.T. 967, and on the other 132 and A.T. 173. They have a copyright date of 1989.

    Any help would be greatly appreciated.

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  2. #2
    Join Date
    Aug 2002
    Southold, NY
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    Your controls contractor can get them

  3. #3
    Join Date
    Jan 2004
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    Looks like it may be part of a BAS. If so, you might want to call your control contractor, as it may not be plug and play.
    Contractor locator map


    How many times must one fix something before it is fixed?

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