Ohio New issue - E-4 low water temp common issue...

Discussion in 'Maintenance and Troubleshooting' started by don c, Feb 11, 2016.

  1. don c

    don c New Member

    well I guess I jinxed myself with the mystery antifreeze / system check up thread.

    I woke up today to a low temp fault on this unit.

    *** important note *** I recently ( last month and I believe I have not had low outdoor temp since install) had a new climatemaster programmable thermostat installed under warranty. My old themo - ( 2 years old) would loose all stored data whenever the power would go out.

    This is the exact same thermostat I had before ( of course with updated sorftware or battery to resolve the mentioned issue) I can post the model # when I get home - but this is the popular climatemaster brand unit.

    Since I have never had a low temp fault before - is it possible that there is a setting that was done incorrect by the installer ? I have read for instance, that the Delta T can be adjusted to allow more flow past the condensor / heat exchanger to help reduce the possibility of frost build up ?

    Another observation I noticed is that a LAT thermo that I have on a vent in the living room was showing just a bit higher temp ( 90 degrees vs a more common 88 degrees) which I thought was unusual for the 12 degree outdoor temp we are having currently. House is set at 68

    I now wonder if that may have indicated a slow flow rate thru the system ( longer exposure of coolant than should be ) .... sorry if I am going down a wrong path on this one... but thought the higher vent temp ( very unusual for my stage 2 heating to hit 90) was worth mentioning.

    in summary:

    could the new thermostat have had a setting or two incorrectly adjusted for my system ?

    The system is a 4 ton 2 stage tranquility closed pond loop.

    Has been running for 2 1/2 years with out issue.

    I am running marginal on antifreeze ( possible 24 degree protect ) per a previous post

    Last year running 31 EWT and 26.5 LWT ( have not yet checked this year )

    Looking to see if I should check the Delta T setting ( and I need the procedure to do so ) or any other setting that could cause the new fault to appear.

    Thanks a bunch !

    Don in Ohio
  2. Mark Custis

    Mark Custis Not soon. Industry Professional Forum Leader


    Your guessing instead of measuring is liable to cause tinkering, and that can cause frozen people and pipes.

    Get tools and learn how to use them or call a pro.

    I would be happy to help and I do not charge extra for weekends.

  3. don c

    don c New Member

    Hi Mark

    Thanks for the reply. I do have the installing company coming out tomorrow - just thought maybe the Delta was an easy area to take a look at - especially if that is an item that is typically changed in value with a system set-up like mine .... may have been worth a look.

    As mentioned - thermostat was replaced recently ... unit is a Climatemaster ATP32U03/4 and I know there is several installer set functions that can cause issues if input is incorrect.

    If they have trouble tomorrow identifying the issue I'll let you know - thanks for the offer.

  4. Mark Custis

    Mark Custis Not soon. Industry Professional Forum Leader

    I learned early on not to be what was then known as a tube tapper. They would come out to fix your vacuum tube what ever. They would tap one tube at a time until something changed. Replace that tube and start over.

    I bring real world test stuff.

  5. don c

    don c New Member

    **** update on the lower water temp fault ***

    my 2 - 1/2 year old B&D pump station with low pressure Grundfos pumps had a pump failure. system is up and running well at this time. Pump is covered under warranty.

    The new pump has what looks to be an adjustible setting for " Low Med High" - which installer set to the high position .... Does anyone know the reasoning for or circumstances where the setting should be changed ?

    Thanks as always for info and advice

  6. docjenser

    docjenser Well-Known Member Industry Professional Forum Leader

    Do you have 1 or 2 circulation pumps? I assume 2. You might be able to set it to a lower setting if you have enough flow. It might be that the pump is set to match the speed of the other pump. Any idea what your delta t (difference between incoming and outgoing water temperature) is?
  7. don c

    don c New Member

    Hi Doc - info as requested :

    this is the 2 pump system . I have not checked the delta with the new pump.... will check and update tonite, however last year I had EWT 31.5 and LWT about 26.5 in January.

    I do notice that the LAT at the vent I normally check was down a couple of degrees .... which does beg the question of flow rate ...

    I believe I read that Delta normal recommendation in the range of 5-7 degrees. This is a climatemaster 4 ton system with the low pressure B&D 2 pump system. I was getting apprx 22 - 24 degrees over ambient from the vent in the past ... last night after pump install was about 20-21 degrees.

    Can you supply what would be typical #'s for the delta and is it just a matter of moving the switch on the side of the pump to another setting - looks like just a flat blade to rotate the position of the switch.

    Also what to look for in delta if I were to change the pump to the medium setting.... ?

  8. Stickman

    Stickman Active Member Forum Leader

    I've got a 4 ton tranquility 27 split and a single 26-99 3-speed pump like your new one. I had the same thoughts on which setting (lo-med-hi) was best. Honestly, I still don't know. However, the attached is what I found that does provide some performance specs (for my equipment) related to this. I found it in the ClimateMaster Product Catalog. Maybe you can find it for your exact model on the CM site?

    Attached Files:

  9. don c

    don c New Member

    additional data -

    Measured EWT 34.8 LWT 29.3 today w/ a bit warmer weather in ohio - outside temp about 28 degrees right now.

    How does the delta of 5.5 sound for this system ?
  10. Mark Custis

    Mark Custis Not soon. Industry Professional Forum Leader

    Yes. 4 to 6.
  11. docjenser

    docjenser Well-Known Member Industry Professional Forum Leader

    Assuming that your refrigerant circuit is OK, which it seems, around 5 degree delta T is a good number.

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