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  1. Replies
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    The loops don't really enable each other, they...

    The loops don't really enable each other, they just disable each other...Same thing I guess. Through the simulator i have tried about 50 times playing with the supply air and they never end up...
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    784

    Thanks, what i ended up doing was taking the...

    Thanks, what i ended up doing was taking the output of each of the AIA's for cooling/heating(I am using Spyders) and running them into a compare block. For now i have it set at 20% with an off...
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    784

    Control logic for supply air set point?

    How would some of you go about tackling control of a supply air temp with niagara logic?

    The unit is 100% OA and i am going to be using compartive enthalpy when i transfer these over to the new...
  4. Closed Loop cooling tower night set back?

    A question regarding a closed loop cooling tower loop for about 400 water source heat pumps, in which about 95% of them go unoccupied after 6pm. Would there be any savings in raising the supply...
  5. I am using 3.7.106.1 with spyder tool 6.0, no...

    I am using 3.7.106.1 with spyder tool 6.0, no issues
  6. Thanks, I understand about the deficiencies,...

    Thanks, I understand about the deficiencies, and also trial and error. The old school method you mentioned was what the instructor went over very briefly at the training thing i went to at Johnson...
  7. Are there any decent loop tuning courses around that you have been to?

    Looking for a loop tuning course later in the year to go to possibly, preferably 3-4 day one. Have any of you been to one that you recommend or to stay away from?

    Thanks
  8. 3 Way Valve Dual Actuator Setup...Install?

    Hi,

    We only have a few set's of 10" 3 way valves on a few of our loops that I am responsible for. I have never had to install from scratch a new dual actuator setup. What what be the correct...
  9. You can pretty much do same with the Spyder...

    You can pretty much do same with the Spyder pallet as you can with the Niagara stock pallet logic blocks. Some blocks can do multiple things where some of the stock ones in Niagara are geared for...
  10. When i say unoccupied i am talking about the heat...

    When i say unoccupied i am talking about the heat pumps that conditiion the space, the radiation heat was never on a schedule other than enable at 40dF and is completely seperate from the scheduled...
  11. Yes i am only using exterior perimeter offices...

    Yes i am only using exterior perimeter offices for the average, all office are 95% the same size and exterior walls except for the corners. I am using the 1st floor as the basis for everything as...
  12. Thanks, The system is based off OAT reset,...

    Thanks,

    The system is based off OAT reset, but that max supply set point is what i am changing during occ and unocc.

    I am not talking about lower the boiler water temp. Our boiler temp is...
  13. Scheduling OAT reset max supply temps for occupied/unoccupied hours..

    I have come up with a system where during unoccupied hours or weekends that will lower the hot water supply temps to whatever i choose. Instead of let's say having a max 140dF supply temp in a...
  14. Thanks, Yes i am using DDC...

    Thanks,

    Yes i am using DDC controllers/Niagara. This whole project is coming up in a few weeks, everything is being set up now. It was all designed by our in house engineers. The VFD's are not...
  15. Pump Control - Closed loop & VFD Control Strategy?..

    For a closed water loop with a couple pumps/vfd's what would be the ideal control strategy?

    1.
    - try to maintain a certain system pressure?
    - try to maintain a certain differential pressure?
    -...
  16. Replies
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    I would still like to get these easy io's up and...

    I would still like to get these easy io's up and going again to add something else to my arsenal. I have about 8 of them sitting here that I never ended up using. I do have a few places I could use...
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    I was mainly thinking after the flow valves were...

    I was mainly thinking after the flow valves were replaced, but even now, if the branches off the supply line are now restricted with circuit setters, wouldn't the water move faster through the main...
  18. Replies
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    thanks, The discussion came about because I...

    thanks,

    The discussion came about because I would like to swap these 407c units for 410a units that have built in bacnet controls so i can plug them directly into our network. This would...
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    407c/410a.....Tower water temps..

    Hi,

    We had this discussion today regarding the condenser water temps and the relation to using 410a or 407c when replacing our R22 units(100s of them)

    There has been a tech that has been...
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    Yes! That was happening a lot. The relay would...

    Yes! That was happening a lot. The relay would close that first time, and then now that i think of it i checked it a few times afterwards during all this mess and i remember it staying closed and...
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    Wow there is a lot more to this than i thought! ...

    Wow there is a lot more to this than i thought!

    So i finally had a chance to play with everything for awhile today for a decent amount of time.

    1. I noticed when no wires are connected at all...
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    So the dry contact pulsing did not work for...

    So the dry contact pulsing did not work for whatever reasons. The equipment i am pulsing to accepts 5-15vdc inputs for also, Couldn't i just drop a resistor cross the 24vdc pulse outs on my meter...
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    Thanks, I was definitely going to go with a...

    Thanks, I was definitely going to go with a solids state relay unless there were other recommendations here.

    I guess finding one with lowest opening and closing time would be what I want
  24. Interested in this as well in case it ever...

    Interested in this as well in case it ever happens. Not sure of the replace thing your talking about either.
  25. Replies
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    Pulsing question ..relays

    I have not done much with pulsing at all but have quick job I need to get done soon.

    It's a totalizer that I will configure to pulse out to turn some equipment on after so many pulses have...
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