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  1. Siemens TEC 540-505N vs. 540-505, what are the differences?

    I need to know what the differences are on the 540-505 vs. the 540-505N. I'm used to the one without the "N".

    I just installed a couple of them with the "N", and they don't do the same thing. I...
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    Merkas, It turns out that our TECs are the...

    Merkas,
    It turns out that our TECs are the 540-105N, unlike I thought... What does it do differently for figuring the switchover?
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    700

    Daramore, That seems exactly what it's doing,...

    Daramore,
    That seems exactly what it's doing, as the thermostat will reset itself to the DAY HTG or CLG setpoint without anyone touching it.

    What is the fix for this? Where would I find the...
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    It's 540-105 637921 Here's the current...

    It's 540-105

    637921

    Here's the current report (if this upload works). Only a snapshot of what's going on right now, which isn't much. Notice, though, that I have the HEAT.COOL point in OPER for...
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    Here is more frustration.... This morning, CTLT...

    Here is more frustration.... This morning, CTLT STPT was 73.0 deg. The HEAT.COOL was in the HEAT mode, and the heat pump was heating.

    It acted just like it's supposed to. At HTG LOOPOUT of 50%,...
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    The minimum is 68, and max is 76. The setpoint at...

    The minimum is 68, and max is 76. The setpoint at the time was 73.0, both at the thermostat and on the CTL STPT, so 73 was setpoint, HEAT.COOL mode was COOL, and ROOM TEMP (which is the same as the...
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    I mean that we have upgraded our panels from...

    I mean that we have upgraded our panels from MBC's/MEC's to PXCMs and PXCC's. So I'm curious if the newer equipment has the same sequence of going through the programs. We have a few PXCM's with 10...
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    Chugger95, We were under the impression that...

    Chugger95,
    We were under the impression that the newer PXCM and PXCC panels handled their programs differently than you describe--that older panels like MEC's were the ones that required only 1...
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    Siemens TEC application 2070

    I'm seeing an issue with the point (5) HEAT.COOL not changing from COOL to HEAT, and from HEAT to COOL. We're using a 540-105 TEC (Single Stage heat pump controller). Application 2070.

    I would...
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    We figured out our problems and got the panels...

    We figured out our problems and got the panels switched over and talking.

    What we were missing:
    - In Terminal Emulation, we needed to tell the field panel that its communication was ethernet. ...
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    I forgot to mention that we do not have a BACnet...

    I forgot to mention that we do not have a BACnet system.
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    Siemens change an RS-485 to Ethernet

    I've been attempting, with no luck, to update/upgrade a field panel from being on the RS-485 BLN to an Ethernet. I'll try to keep this understandable...

    We have a PXC100-PE.A that is on an RS-485...
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    That's what I thought. It's not connecting...

    That's what I thought.

    It's not connecting through hyperterminal, though... I'm guessing at this point that the cable we're using is not set up correctly. We updated to a bit newer of a laptop....
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    734

    Siemens PXC24 Startup

    Long story short... I've been to siemens training, but it's been a while. Not having used the training in the field, I'm not recalling enough.

    We're trying to startup and address/name a PXC...
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    Our supplier can't even find that TEC in their...

    Our supplier can't even find that TEC in their available pricing.

    Have you used the 550-538 or the 540-863J?

    The 550-538 is a heat pump TEC with extra DI and AI terminals, but I can't find the...
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    Siemens TEC questions

    Does anybody have experience using a 540-1028 TEC? If so, what applications can run on it? Can I run a 2070 heat pump application? How about a 2273?

    Our hospital uses geothermal heat pumps for...
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    Thanks. I feel like such a novice around here...

    Thanks. I feel like such a novice around here...
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    Siemens and VFD brands

    Can I put any brand of VFD in on our siemens apogee/insight system? We have typically used ABB, but we'll be trying an Allen-Bradley. It doesn't necessarily need any connection to the DDC system, but...
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    Thanks all for your help. I'll be checking with...

    Thanks all for your help. I'll be checking with our Siemens rep about things. I'm also looking in to the HRW option. It does look like it runs on P1, so it may fit what I'm looking for.
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    Is it not possible to write the P1 code from a...

    Is it not possible to write the P1 code from a Siemens TEC into a Scadapak?
    Thanks for the help so far.
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    Scadapak TEC on a Siemens system

    The buildings we monitor/control here at our Medical Center campus are all controlled by a Siemens APOGEE/Insight system.

    We have close to 200 geothermal heat pumps that condition their own...
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    Wow, is right, GT1980... I have no clue what you...

    Wow, is right, GT1980... I have no clue what you mean. Maybe elaborate (be more clear) on what it is you're trying to state there.
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    Thanks for setting me straight... What we deal...

    Thanks for setting me straight... What we deal with is geothermal heat pumps. Sorry for any confusion.
  24. Replies
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    Very well stated. Thanks!

    Very well stated. Thanks!
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    Wow, those are like the failure rates we've seen...

    Wow, those are like the failure rates we've seen with our Florida Heat Pump brand. I work at the local hospital, and we have over 200 geothermal heat pumps throughout our campus. I haven't seen that...
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    Right, 32 max. I understood that the intercept is...

    Right, 32 max. I understood that the intercept is more correct. Will the other work? If so, will it cause the system to slow down more than the intercept method would do?

    The longer story is that...
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    I have lots of experience with fixing and working...

    I have lots of experience with fixing and working on, and fixing again, and working on again....the florida heat pump brand. I work for our local hospital, and we've switched to the climatemaster...
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    I don't think there's any problem with a closed...

    I don't think there's any problem with a closed loop system placed in a body of water.

    To the OP, I would reccomend that you go ahead with floating the loop and fixing the leak. I know of one...
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    This is the Ask Our Pro's forum, and only Pro...

    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise, commentary, or ask questions of the OP here.

    You can find the rules for posting and...
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    Siemens FLN connection question

    Sorry if this seems like a dumb question... but if I'm adding devices to an FLN, do I need to intercept the FLN wire, or can I splice right into it? Please refer to the attached pics/diagrams.

    Or...
  31. Thread: Hospital IAQ

    by ClarkBP
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    1,070

    Hospital IAQ

    Recently, I've been trying to research the best option for our IAQ in our hospital and care facilities. I'm more wondering about UV lights and their effectiveness for health care facilities.

    I've...
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    New to this Forum.

    Hey all,

    I'm an HVAC Maintenance employee for the local hospital in Roosevelt, Utah.

    I've been designing, installing, selling, maintaining, troubleshooting, etc HVAC systems since about 1995....
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