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  1. #1
    Join Date
    Mar 2014
    Location
    Toronto
    Posts
    47
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    Climate master Heat pump

    Hi guys, first post in awile. Its my first time working on a system like this.
    Climate master Heat pump-Tranquility-model#TTH072BGDC0Trps, Its fed off a Closed loop water system-which also feeds other HP units throughout the store.

    The fault, when i got the call was the HI head pressure switch opened in cooing mode, i reset system it operated very well the time i was there cooling the area. These are the readings i got:
    My delta T between water in and out was 15deg water supply temp was 80*F, and return 95*F. My suction pressure was 120psi and head was 380psi -(R410a)

    The other units around have been operating ok, so I dont think its the main Geo- system loop. The problem is likely within this unit.
    I checked back on the fault history and it had been faulting on same issue. I talked to owner who said this has been the same problem even in heat mode-through last winter. He said it runs well for awile then faults. Intermitant problem

    Has anyone experienced something similar to this intermittent issue with these systems?

    Thanks

  2. #2
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    5,967
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    If I had to guess I would say low water flow, 15 rise across the coax is above normal, usually around 10. Check the pressure drop across the coax and compare that to the water flow chart to see how much water you are actually moving through the unit.

  3. #3
    Join Date
    Feb 2008
    Location
    Western Wa.
    Posts
    3,667
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    I don't do any Geo thermal stuff but I do work on water source heat pumps all the time. As kls said 15degrees is to high 8 to 10 degrees more ideal. Does it have a strainer? Maybe back flush the heat exchanger and clean the strain then adjust the circuit setter if it has one.
    UA Proud

    "Phfft! Facts. You can use them to prove anything." Homer Simpson

  4. #4
    Join Date
    Jun 2013
    Location
    Lee's Summit, MO
    Posts
    10
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    We have 50+ of the ground Loop units in our hotel. In zone 3 they are not ideal for heating but seem to work OK (when they work) haha! Multiple problems with these rascals. Low flow alarms (4 code). Is the most popular. Staying on top of closed water loop maintenance is paramount. Regularly check glycol levels. Backflushing coax, and here lately. We've noticed corrosive buildup at the outlet valve assembly causing restrictions. Don't get me wrong we have to occasionally drop a unit and replace expansion valves too. But water flow is the key to keeping these little boogers happy!

  5. #5
    Join Date
    Jan 2014
    Posts
    73
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    Waterflow? Does the unit have its own flow center or is it a solenoid? Or is it twinned with a relay and paired with another pump. Pull off the spade terminals on the hipres switch and replace them with new. Ive seen quite a few spades where the insulation was crimped instead of bare wire. Thats a ****ing headache. The twinning boards solder joints crack, fix is to resolder with good solder, new boards will crack again. List goes on these are the simple fixes.
    Picture of the relays.
    http://www.google.com/search?q=flow+...63SkzPELAsD8M:

  6. #6
    Join Date
    May 2016
    Location
    Toronto, CAN
    Posts
    121
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    If it has a zone valve it's probably not opening. I have a building with 150 of them and the zone valves suck. There is also an end switch on them so they won't start until made.

  7. #7
    Join Date
    Jan 2014
    Posts
    73
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    Read this again and decided to do the math. If the system is operating normally than he is getting roughly 10 gpm which is on the low side but still within spec. If we take our HOE formula,
    (Gpm) (fluid delta T) (fluid transfer number). For methanol its 485 at 15f freezing point.
    Water deltaT 15f GPM 485 = 72000btu/hr
    Divide 72000 by 15, then again by 485 and you will get the gpm, about 9.9.
    Looking at the tt series pressure drop tables 9.9 gpm would give you 1.65gpm/ton, which is low but within spec. 320 head pressure is right in range with the 80ewt at that flow rate, the suction is actually low unless the entering air is 65 or cooler and might have slight undercharge in the circuit which would not give a hi pressure fault.
    Anthing outside of waterflow or refrigerant is the problem.
    Last edited by crispE; 07-04-2017 at 05:09 PM. Reason: Confusing statement 15f delta t vs 15f freezing point

  8. Likes Juan Madera liked this post

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