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Type: Posts; User: leoxxl

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  1. Replies
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    No one knows?

    No one knows?
  2. Replies
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    435

    TA System 7 interfacing to Tridium WebAx?

    We are looking at a project that the old building has existing older TAC Zone II system. The new building will be a Niagra WebAX which is required to interface with the exisiting system.
    Does anyone...
  3. Thread: Fan Status

    by leoxxl
    Replies
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    1,583

    I actually prefer DP Flow switch as a feedback....

    I actually prefer DP Flow switch as a feedback. However, I was told that costs too much.
    For the job I am doing. I am not even hard wire the VSD enable and speed reference. All the points will be...
  4. Thread: Fan Status

    by leoxxl
    Replies
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    1,583

    Fan Status

    Hi Guys, I am not very much into VSDs. A quite simple question.

    One of the most common ways in picking Fan Status is to install the CT switches as digital inputs to the DDC controller.

    For fans...
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    Thanks again, Matrix I am pretty sure my...

    Thanks again, Matrix

    I am pretty sure my workbench does NOT have demo license. I can log into the platform but it wont run any station. I dont know what kind of license JCI provided.

    The...
  6. Replies
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    Thanks for the tips Matrix. I think I need to...

    Thanks for the tips Matrix.
    I think I need to get a Demo license then?

    Leo
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    Thanks for the information I know I can use...

    Thanks for the information

    I know I can use serial shell mode to reset the platform password.is there any way to get into the station without knowing the station login?

    Leo
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    Thanks matrix. What worries me is that if I...

    Thanks matrix.

    What worries me is that if I got the job, but I cannot access the station, I will be screwed, cause my quote will be based the existing station, not redo the whole thing.
    I may...
  9. Replies
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    Thanks a lot for your advice, Matrix The...

    Thanks a lot for your advice, Matrix

    The existing Jace is from Vykon. The DDCs are TAC Invensys. There is no supervisor on site.

    As it is an expansion job, it will be less hassel to just add...
  10. Replies
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    1,519

    existing old jace 2

    i am quoting a sports center expansion job which has got a jace 2. i think the jace version is before3.4. can i still use this jace and also keep the statio? i can get the station access.i currently...
  11. Replies
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    thanks for all the input. i finally logged in....

    thanks for all the input. i finally logged in. the login is jci, explorer. unlike HW Webs, here is a preloaded station in fx20.
  12. Replies
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    Surely I am gonna try it on Monday. Will keep...

    Surely I am gonna try it on Monday. Will keep everyone posted. Thanks a lot
  13. Replies
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    1,657

    it is a new jace uncommissioned. there is no...

    it is a new jace uncommissioned. there is no station running.
  14. Replies
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    1,657

    Cannot Log into Platform FX20

    Hi Guys. I ordered a new FX20 from JCI, but I couldnt open the platform
    1. I changed the IP address on my PC to 192.168.1.05, and subnet mask to 255.255.255.0.

    2. Connect FX20 via ethernet, and...
  15. Replies
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    3,029

    Is that version 4.8.8 for both?

    Is that version 4.8.8 for both?
  16. Replies
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    677

    Surely I will. Thanks for the tip

    Surely I will. Thanks for the tip
  17. Replies
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    677

    problem solved. It turned out I put in wrong...

    problem solved. It turned out I put in wrong domain name
  18. Replies
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    677

    Thanks Digo, Niagara platform management service...

    Thanks Digo,
    Niagara platform management service is running.
    User name cannot be changed due to the company policy

    MatrixTransform,
    I cannot log into the workbench, I got the login dialog box....
  19. Replies
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    Web Supervisor Platform Login Failed

    As we all know the login shall be the windows login. We have tried what we could, and couldnt get it work.

    The PC user is the admin user and there is no duplicated user names in this laptop.

    ...
  20. Thread: VAV K-Factor

    by leoxxl
    Replies
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    865

    VAV K-Factor

    Is there an equation between K-Factor and Velocity Pressure, or it varies with different VAV Manufactures?
  21. Replies
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    4,114

    Thanks GT The floating actuator is integrated...

    Thanks GT

    The floating actuator is integrated in the Honeywell VAV controller.
  22. Replies
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    4,114

    Thanks for all your inputs. I have to use...

    Thanks for all your inputs.

    I have to use Honeywell VAV Spyder, which has a floating actuator. I have problems in controlling the VAV damper, if I use PID percentage output to the damper position...
  23. Replies
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    4,114

    VAV damper actuator

    Modulating actuator or Floating actuator, which one is more common?
  24. Thread: VRV control

    by leoxxl
    Replies
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    779

    According to the specification, modulating...

    According to the specification, modulating dampers are required to control the supply air volume for fan coil units, which I think is not necessary in VRV system.

    The VRV is cooling only. There...
  25. Thread: VRV control

    by leoxxl
    Replies
    6
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    779

    VRV manufacturer is not specified. No matter...

    VRV manufacturer is not specified.

    No matter what brand it is, all VRV controls shall be in the whole package, right?
  26. Thread: VRV control

    by leoxxl
    Replies
    6
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    779

    VRV control

    We are tendering a small job with VRV. 7 in ceiling fan coil units, each one serves a single zone.

    Here is what the engineer specified:

    1.The zone supply air shall modulate to control the zone...
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    I will call the engineer. Just check with you...

    I will call the engineer. Just check with you guys before I challenge him.

    The engineer also specified some of the condenser water valves to be modulating. I cannot figure out why use a modulating...
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    it is an office building. The diffusers are not...

    it is an office building. The diffusers are not motorized. There is no econimizer. A fixed OA air percentage is specified, I think it is even Ok to use a 2 position actuator rather than a more...
  29. Replies
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    Johnson's FX is Tridium Jace, which I think they...

    Johnson's FX is Tridium Jace, which I think they have developed a driver for their N2 bus.

    Honeywell has 2 channels as well, Comfortpoint system which is a part of EBI, and the WEBs AX is for...
  30. Replies
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    Thanks crab master, It is not mislabeled, as...

    Thanks crab master,

    It is not mislabeled, as the OAD is also listed as an AO. I just checked specs, the compressor type is scroll, but capacity control is not specified. Even it is a VFD scroll or...
  31. Replies
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    Control water cooled DX package unit

    Hi Guys,

    Have been involved in a job that has 35 water cooled DX package units, all of them have constant speed fan. And the engineer has done the I/O schedual in the specification, which the...
  32. Replies
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    Are you using Jace 6? I couldnt find Airflow...

    Are you using Jace 6?
    I couldnt find Airflow Alarm in the XL10's configuration. Havent got a chance to program a pressure reset, I would use the latter method you mentioned above. When Maximum...
  33. Replies
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    Yes, Outdoor Air for VAV systems, typically in...

    Yes, Outdoor Air for VAV systems, typically in VAV systems with pressure reset.
  34. Replies
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    Thanks for your inputs. Guys. Really Appreciate...

    Thanks for your inputs. Guys. Really Appreciate it.

    BTW, how do you manage OA? We normally use Dual OA damper position, unless it is specfied.
  35. Replies
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    We are gonna put in a NO valve + 3-10Psi...

    We are gonna put in a NO valve + 3-10Psi actuator, one of our guys thinks its gonna wokr, while I pretty much doubt. Will see how it goes.
  36. Replies
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    VAV Static Pressure

    Is there any rule of thumb in determine main duct static pressure setpoint?
  37. Replies
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    2,386

    Yes, there is a direct action damper actuator...

    Yes, there is a direct action damper actuator 5-10Psi. The thermostat is direct acting, a reversing relay and the original heat valve is a NC valve with 8-12psi spring. Now if I replace it with a NO...
  38. Replies
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    The model is VP534. Cannot see it quite clearly....

    The model is VP534. Cannot see it quite clearly. NC valves are easy to source, we cannot get the actuator in time, lead time is quite long.

    Yes, a positioner will be better, as I still have not...
  39. Replies
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    2,386

    Yes I have tried, and couldnt source from the...

    Yes I have tried, and couldnt source from the other suppliers
  40. Replies
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    Pneumatic Reheat Valve

    Recently had a job Pneumatic VAV with reheat, I am not a pneumatic guy. Hope someone here can help me.

    It uses a Honeywell direct acting pneumatic thermostat, the pneumatic reheat valve is a...
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    Downstream of the coil is normally the supply...

    Downstream of the coil is normally the supply line, right?
  42. Thread: TXV question

    by leoxxl
    Replies
    2
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    612

    If TXV is sized too big, it will cause problems,...

    If TXV is sized too big, it will cause problems, such as too low evaporating pressure. Does the TXV have a MOP charge
  43. Replies
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    Generally, a globle valve has better throtting...

    Generally, a globle valve has better throtting ability than a ball valve, A lot of manufactures now provide charactrized ball valves, enhancing the throtting capablity of ball valves. It wont make a...
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    A venturi valve(like pheonix) doesnt need a VFD....

    A venturi valve(like pheonix) doesnt need a VFD. One of the common pressurization using direct pressure control, and sometimes it is quite hard for a VFD & Exhaust fan to response to the pressure...
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    Fuzzy, Really appreciate your comments! What...

    Fuzzy,

    Really appreciate your comments!
    What if I use a Supply Air sensor (both temp and RH), and the supply air dry bulb is controlled by the reheating valve, and the supply air RH is controlled...
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    The above may make no sense to you guys. My...

    The above may make no sense to you guys. My background is not control, so my idea can be totaly not feasible. It will be appreciated if you guys can share your comments,

    My thought was, when...
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    Here is what I think, When dehumidification is...

    Here is what I think,

    When dehumidification is not required, coiling valve is modulated to maintain a SAT. When Return Humidity is above a setpoint which means dehumidification is required, Return...
  48. Thread: Bypass valve

    by leoxxl
    Replies
    2
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    666

    You are right, in 2-way valve systems, a bypass...

    You are right, in 2-way valve systems, a bypass valve in the bypass line needs to be a modulating valve to maintain the minimum flow of the chillers. A gate valve and butterfly valve is not...
  49. Thread: Bypass valve

    by leoxxl
    Replies
    2
    Views
    666

    Bypass valve

    In a constant flow 2-way valve + Bypass line chilled water system, the bypass valve normally needs to be a linear globe valve. However, I have seen that a lot of these valves are non-linear valves...
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    I think you are right, Spring is the for...

    I think you are right, Spring is the for determine the start pressure and pressure change required for full movement of the actuator from open to closed or from closed to open. It doesnt produce much...
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