Search:

Type: Posts; User: DreamCar

Search: Search took 0.00 seconds.

  1. Replies
    23
    Views
    7,215

    How do you recommend controlling a VAV unit,...

    How do you recommend controlling a VAV unit, where the unit must discharge around 55 to 60 deg F whenever its running if not by discharge air temp?

    Most equipment manufacturers (applied units, not...
  2. Replies
    13
    Views
    1,362

    The main question is - are the VAV's change over?...

    The main question is - are the VAV's change over? Do they recognize (or do you tell them) when there's hot air in the duct vs cold air in the duct.

    A true VAV system is cooling air only. One...
  3. Thread: Wgx 9100

    by DreamCar
    Replies
    6
    Views
    1,281

    Yes, configuring and commissioning.

    Yes, configuring and commissioning.
  4. Replies
    13
    Views
    1,384

    Up here in the great white north... On our...

    Up here in the great white north...

    On our MUA's you definitely need to not open heating wide all night. Open / close is fine, maintain a plenum temp of some kind at about 60 or 70.

    Forget...
  5. Thread: NCE Info

    by DreamCar
    Replies
    5
    Views
    729

    Yes, it can have graphics on the "NAE" portion of...

    Yes, it can have graphics on the "NAE" portion of the NCE that display collected N2 data.
  6. Replies
    12
    Views
    1,347

    Yes, this can be done, I can do this on my other...

    Yes, this can be done, I can do this on my other laptop. If you need more than one side loop, or want to put a UNT program into a VAV, there is I think 2 fields to change in one of the dbase files. ...
  7. Replies
    16
    Views
    1,911

    I only use GPL for steam 3 way valves...

    I only use GPL for steam 3 way valves...
  8. Replies
    6
    Views
    1,202

    The N2 on board the McQuay chiller is of no use...

    The N2 on board the McQuay chiller is of no use for remote accesss, its purely for reading slave io boards. JCI made the OEM controllers for McQuay, so it had an N2 on it.

    Your best bet for...
  9. Thread: VMA1420

    by DreamCar
    Replies
    9
    Views
    791

    Right you are, I should have checked before...

    Right you are, I should have checked before posting. It was late & I wasn't at my work laptop. Just lazy!

    This is however an open forum for discussion, and I for one would rather know the...
  10. Thread: VMA1420

    by DreamCar
    Replies
    9
    Views
    791

    If my recollection is sound (a big if...) you...

    If my recollection is sound (a big if...) you can't download a pressure dependant sequence into a VMA-1420.
  11. Replies
    7
    Views
    1,251

    If you want the valve open at 100% at 25psi, 0%...

    If you want the valve open at 100% at 25psi, 0% at 10psi, just use a PI loop, with setpoint of 10, prop band of 15 (10+15 = 25psi full open).

    If you want more accurate control to a specific number...
  12. Thread: VMA1420

    by DreamCar
    Replies
    9
    Views
    791

    I didn't think the CZA supported pressure...

    I didn't think the CZA supported pressure independant control. Haven't used it in a while though, so I'm not really sure.
  13. Replies
    9
    Views
    2,588

    Try "State Transition Table" in Wikipedia. Its...

    Try "State Transition Table" in Wikipedia. Its the basis for the FEC programming, and if you're used to following a program from input - to logic - to output, this will be a real switch.
  14. I did a test setup once as a demo. Never...

    I did a test setup once as a demo. Never actually sold it though. It did work & I was able to read / write to the NAE. Schedules came up fairly nicely too. Any specific questions?
  15. Replies
    10
    Views
    2,824

    The NAE likely supplies all the data for either...

    The NAE likely supplies all the data for either the OWS or your remote laptop. Remote Access Software is not required, it just makes the process faster.

    Go to JCI public document site & search...
  16. Replies
    23
    Views
    2,744

    One PID or 2 doesn't change the rest of your...

    One PID or 2 doesn't change the rest of your sequencing, just how it tunes. You still need to do all the rest - ie make sure it doesn't spend too much time below say 10%, and open very slowly on...
  17. Replies
    23
    Views
    2,744

    If you have trouble tuning with a single PID loop...

    If you have trouble tuning with a single PID loop on both valves, try a pair of PID loops - one for each valve. Simply lock them at 0 or 100% according to your sequence. That way you get separate...
  18. Replies
    14
    Views
    2,258

    That's the downside of most heat pump systems -...

    That's the downside of most heat pump systems - no air side economizer available. Interior zones, or server rooms etc need their compressorized cooling year round.
  19. Replies
    14
    Views
    2,258

    Absolutely right, the only thing that might want...

    Absolutely right, the only thing that might want an outdoor air lockout would be the spray pump to prevent it coming on in freezing weather when the sump is likely drained.

    Other than that, just...
  20. Replies
    6
    Views
    680

    Well, its probably the UNT or the current sensor....

    Well, its probably the UNT or the current sensor. UNT's typically have a default minimum on / off time, so if the current sensor flaked out for a second, the burner would likely turn off & stay off...
  21. Replies
    6
    Views
    680

    Any discharge temp sensor on the UNT? Could be...

    Any discharge temp sensor on the UNT? Could be cycling on a high limit if the sensor is bad (assuming it never actually gets any heat out of the burner).

    We've had some trouble with the UNT's...
  22. Replies
    6
    Views
    680

    you might want to verify that the controller is...

    you might want to verify that the controller is indeed turning the burner off. Try a pilot light in parallel with the call for heating. If the light stays on while the burner shuts off, its...
  23. Replies
    13
    Views
    1,022

    If that's really all it is, just add an...

    If that's really all it is, just add an "activity" to any one of the 3 columns (I would use output control column). View logic of that activity, add your 2 float inputs, one enum output (off/on),...
  24. Replies
    13
    Views
    1,022

    Thanks! Will keep in mind.

    Thanks! Will keep in mind.
  25. Replies
    6
    Views
    1,110

    I have no experience with the varitrac, but could...

    I have no experience with the varitrac, but could it be a tube for your static pressure sensor is nfg, pinched, or fallen off the controller?
  26. Replies
    2
    Views
    975

    The return controller is probably your best bet,...

    The return controller is probably your best bet, but would be idealy located at the mixed air location if possible (can be tough to sense here though). That way if the return is coming back at 65,...
  27. Replies
    13
    Views
    2,418

    The Daiken VRV is also something we've used, it...

    The Daiken VRV is also something we've used, it can be used for multi zone heating and cooling, much like a VVT system. You get better efficiency since you're using one larger set of compressors...
  28. Replies
    13
    Views
    2,418

    We use Aaon's, they're efficient, but doubtful...

    We use Aaon's, they're efficient, but doubtful that you'll see much savings in a gymnasium application where you're simply controlling based on the space temperature. Their real strength (with the...
  29. Replies
    4
    Views
    1,501

    I've got no technical info on the Stulz...

    I've got no technical info on the Stulz integration, but we've used field server several times & it has never been right based on field server's factory configuration. Your best bet will be to get...
  30. Replies
    12
    Views
    1,312

    FDA CFR 11 validated is available on MSEA, its a...

    FDA CFR 11 validated is available on MSEA, its a replacement or add on to the ADX package, no longer a cyborg / hybrid / bastardized / duct tape package. We haven't used it though.
  31. Replies
    13
    Views
    1,022

    BTW, I don't think the milwaukee course talks...

    BTW, I don't think the milwaukee course talks much about custom programming, except to touch on it. We're all self taught up here - the one guy that took the training doesn't do any programming.
  32. Replies
    13
    Views
    1,022

    FEC's are extremely powerful custom programming...

    FEC's are extremely powerful custom programming modules, but there is definitely a learning curve. If you have a very good programmer, I would recommend getting that person to develop modules that...
  33. Replies
    14
    Views
    1,601

    We made the evaluation a couple years back, and...

    We made the evaluation a couple years back, and in our area it seemed to make most sense to stick with JCI using the FX line, as we would still have access to the NAE's for our existing sites. You...
  34. Replies
    18
    Views
    2,191

    N2 isn't going anywhere any time soon, but it...

    N2 isn't going anywhere any time soon, but it obviously won't be developed, and your source of knowledgable service techs will be disappearing & their tool bags won't have the required upload /...
  35. Replies
    12
    Views
    1,312

    NCE is BACNet TCP/IP with field i/o points...

    NCE is BACNet TCP/IP with field i/o points through an embedded FEC controller.

    I'm not aware of server redundancy, but I do believe its on the wish list as they had it with the old NCM 350's. By...
  36. Replies
    7
    Views
    987

    Storing a few graphics on a 35 won't be a problem...

    Storing a few graphics on a 35 won't be a problem for performance, just keep the size reasonable. Use aliasing (one graphic tied to multiple VAV's say) to use less memory.
  37. Replies
    17
    Views
    3,788

    Make sure you only bypass the towers fully, or...

    Make sure you only bypass the towers fully, or fully flow to the towers. Open loop towers do not work well with partial flow. (Especially in colder climates - partial flow on a tower can freeze it...
  38. Replies
    6
    Views
    806

    We used a TrendNet USB adaptor, just don't...

    We used a TrendNet USB adaptor, just don't install the drivers that come with it. Just plug in & use. Dell internal bluetooths worked when they built laptops with XP, but when it all went to vista,...
  39. Replies
    20
    Views
    1,383

    If you have a spare AO, set one AO to 60%, the...

    If you have a spare AO, set one AO to 60%, the other to 20%, then use your BI to drive a relay (either through a spare BO or directly from the input device / switch). The relay will be form "C", one...
Results 1 to 39 of 39
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event