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  1. Replies
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    Yes it is only a cooling tower set up, no...

    Yes it is only a cooling tower set up, no chiller. I would not plan on using the variable set point during the winter months for the reasons you said. In the late spring, early fall and winter...
  2. Replies
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    I am implementing wet bulb + approach control for...

    I am implementing wet bulb + approach control for our tours. During the summer months, it would be ideal to drive down the cooling tower temps as low possible since no heat pumps are in heating...
  3. It is used to measure sewerage level of a tank,...

    It is used to measure sewerage level of a tank, it is located between the tank and pumps.
  4. dunno, tried two different PC's and both show the...

    dunno, tried two different PC's and both show the pictures in the thread
  5. What is the middle piece between the flange and transducer?

    Any of you guys know what this piece between the transducer and flange is? Is it a snubber? I have not seen a transducer with this before. This setup is about 20-25yrs old.
    ...
  6. Replies
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    1,079

    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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    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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    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...
  9. 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...
  10. 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
  11. 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...
  12. 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
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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?
    -...
  21. Replies
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    6,035

    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...
  22. Replies
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    510

    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...
  23. Replies
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    510

    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...
  24. Replies
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    510

    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...
  25. Replies
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    1,012

    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...
  26. Replies
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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...
  27. Replies
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    1,012

    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...
  28. Replies
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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
  29. 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.
  30. 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...
  31. Replies
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    6,035

    I have a few EasyIO Bacnet 30p's i was going to...

    I have a few EasyIO Bacnet 30p's i was going to use/learn on another project but never got around to using them. I somehow got it working on my workbench laptop but for the life of me could not get...
  32. Replies
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    6,035

    Curious about your comment...I get the hint they...

    Curious about your comment...I get the hint they are not well liked around here? They are my preference actually.
  33. Which USB to DB9 Null Modem converter to buy?

    I am finding a ton of converters out there, but have been reading around that most of them do not work. My 10yr old laptop just died and the other two newer ones i use do not have the DB9 connector...
  34. Replies
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    Yes a two wire wattage i figured out, max...

    Yes a two wire

    wattage i figured out, max volts squared divided by resistor value = watts
  35. Replies
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    Using resistor to convert to 4-20ma to 1-5v

    When placing a resistor in the 4-20ma to convert it to voltage is it placed in series or parallel?

    When placing it in parallel i get no voltage at the inputs. I run the 4-20ma signal into the...
  36. Bacnet enabled packaged heat pump experiences?...Mcquay or other..

    For anyone here who is using the bacnet modules in there packaged heat pumps. Are you able to control the fan, valve or compressor on demand? We recently installed a new bacnet trunkline throughout...
  37. Thanks, ill give that a try. I did not even...

    Thanks, ill give that a try. I did not even bother to email them since i only saw that one on the website.
  38. Infrared sensor that can be intergrated with field controllers?

    I am looking for a infrared(or any other technology) that can I can read the surface temp of something say 30-50' away. I cannot use any wireless type of devices and no wires in between the...
  39. Mechanical air flow switch or current transducer for fan proof?

    For the last 30yrs or so here at our faciility they have used differential air flow switches to prove air flow/fan running. As i am going through and replacing the old equipment,sensors and controls...
  40. Anyone know of a portable gas heater with built in controller(bacnet?)

    We have an area here at work that has been using propane space heaters(250k btu's x 2) that are used during snowstorms or during extreme cold. The problem is here this is at a remote facility and...
  41. yeah man :D I found the problem..the damn...

    yeah man :D

    I found the problem..the damn thing was reading in HPA units, in "WC :whistle:

    restarting all test now :angel:
  42. The meter has a pressure port built into it, i am...

    The meter has a pressure port built into it, i am using the one off the meter.
  43. Thanks, numbers were very stable. I meant to...

    Thanks, numbers were very stable.

    I meant to bring an additional thermo couple home today when i left early but forgot,there are a couple slots on the meter for two temp readings on. And yes it...
  44. How close to the efficiency rating is close enough?

    I do mainly all commercial work in HVAC and have never really done any residential except for my own and friends of mine. Anyway..We got a fancy new combustion analyzer in at work that we are going...
  45. Replies
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    Munters dehumidifier icing up..

    We had a munters dehumidifier installed a couple years ago and it has been a nightmare from the get go. I was really only just starting to really get into the trade full time at that point and we...
  46. Anyone use a DSO Nano V2 for testing networks?

    Got one in and I am confused with all the settings as i have never used one of these before(or any oscilloscopes)

    Any help with settings and general ideas on using it would be appreciated!
    ...
  47. Replies
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    Actuator Torque Ratings...

    Hi

    I was using some of the online calculators from honeywell and JCI for actuator sizing and they in a range of around 15-25lbs or torque needed for the damper size, FPM and ductwork size.

    I...
  48. Sorry I meant each Jace would have around 150...

    Sorry I meant each Jace would have around 150 spyder controllers
  49. Jace 700...How many Spyder Controllers is it able to handle?

    I am trying to figure out how many Spyder controllers on a Jace 700 i could fit. I am going through my Spyder training manuals and it only states as high as a Jace 600 with a limit of 100 devices per...
  50. thanks for the suggestions... Any explanation...

    thanks for the suggestions...

    Any explanation of the original numbers in my first post would help also. It seems like it says you can pulse or use 4-20?

    100% = 350gpm , so i imagine i would...
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