Search:

Type: Posts; User: ceng

Page 1 of 2 1 2

Search: Search took 0.00 seconds.

  1. Replies
    5
    Views
    1,907

    we are trying to get input from BAS, if the...

    we are trying to get input from BAS, if the nozzals are the right size. Thanks for all the input. I will get all of you posted.
  2. Replies
    5
    Views
    1,907

    Hi, we have 2 2-cells bac 1500 cooling towers,(...

    Hi, we have 2 2-cells bac 1500 cooling towers,( total 4 cells). each cell 1125 gpm, 3 tower pumps, each 1500 gpm. Right now, one pump with all cells are fine. When we turned the last two cells one,...
  3. Replies
    13
    Views
    3,314

    mechdesigner4controls, thanks for all the input....

    mechdesigner4controls, thanks for all the input. They are very helpful. For my system, we have both economizer and wheel. So I am not sure if we'll have such a complex whell control. We won't have...
  4. Replies
    13
    Views
    3,314

    Thanks for all of you. It seems we are on the...

    Thanks for all of you. It seems we are on the right track. We have the filters on both oa and return and we have the by-pass damper on both the path of the wheel. Once again appreciate all of your...
  5. Replies
    13
    Views
    3,314

    why if we shut down the wheel, we'll ruining the...

    why if we shut down the wheel, we'll ruining the wheel? I am not good at wheel at all. Is this for freeze?
  6. Replies
    13
    Views
    3,314

    For Ahus serving classroom, gym, offices under...

    For Ahus serving classroom, gym, offices under north ohio public school systems, it requires those units have both heat wheel and economizer. Any one familiar with those? How those are controled?...
  7. Replies
    10
    Views
    1,072

    we had the same problem on a 150 Carrier chiller...

    we had the same problem on a 150 Carrier chiller before. The second loop won't be on. It turns out there was a thermostat on this circuit was dead. As I am not expert on chiller, I don't know exact...
  8. Replies
    13
    Views
    2,889

    i heard lon has to use some special chips....

    i heard lon has to use some special chips. Backnet is just a potocol, which is very open. I do see Backnet has more market share now. But we use Lon more THe reason is we deal with lots of building...
  9. Replies
    25
    Views
    9,902

    I don't think it is very hard to write a standard...

    I don't think it is very hard to write a standard control sequence. You can find them either in books or by the contruction document. I do believe the start up, trouble shooting part is the key....
  10. Thread: BIG DILLEMA

    by ceng
    Replies
    79
    Views
    5,551

    i am not sure if you have a bigger pie of the...

    i am not sure if you have a bigger pie of the bussiness in your town than the other guy. If this is the case, let things go seems make sense. We don't want people to be desperate, do we? If you are...
  11. Replies
    8
    Views
    777

    i have done this calc. to size the expansion...

    i have done this calc. to size the expansion tank. basically you should have a chart, which tells for every size of pipe, how much volumn is there per foot. you should be able to find the chart in...
  12. Replies
    8
    Views
    777

    i have done this calc. to size the expansion...

    i have done this calc. to size the expansion tank. basically you should have a chart, which tells for every size of pipe, how much volumn is there per foot. you should be able to find the chart in...
  13. Replies
    11
    Views
    7,567

    Thank you for all of your input. I have been...

    Thank you for all of your input. I have been confused by this for long time..
  14. Replies
    11
    Views
    7,567

    please advise what's the difference between those...

    please advise what's the difference between those two control valves. Thanks!
  15. Replies
    9
    Views
    801

    ashrea publishes a rule for places like church,...

    ashrea publishes a rule for places like church, if it is just used for less than 2 hours, and your turn unit on and off one hour before and after, you can cut the oa 50%.
  16. i have seen no guideline for different velocity...

    i have seen no guideline for different velocity on supply and return. it really relates with where you put ductwork(ceiling, shaft?) which kind of system you have(high low pressure) and the function...
  17. If you don't have a discharge section, your...

    If you don't have a discharge section, your discharge opening would be around the same size of the centrifugal fan discharge. Centrifugal fan needs the velocity to generate the pressure. That might...
  18. Replies
    9
    Views
    1,300

    Taco has a new system generating software and...

    Taco has a new system generating software and they are giving our free demo. cd. you might give a try. depends on your system, you might have good amount of accessories to add on.
  19. Thread: Need your advice!

    by ceng
    Replies
    3
    Views
    799

    ashrae on-line library has a good amount of books...

    ashrae on-line library has a good amount of books you can use. for the drawings, i don't know where you can get. most companies see it as a copy right. If you have friend working in this field, she...
  20. Thread: Gas piping chart

    by ceng
    Replies
    4
    Views
    1,681

    most of the stuff I bought are made in China,...

    most of the stuff I bought are made in China, that helps prevents me from red check book..
  21. Thread: boiler piping

    by ceng
    Replies
    2
    Views
    892

    seems you have secondary and primary loop. If I...

    seems you have secondary and primary loop. If I pictured what you are seeing right. did the design provide you a flow diagram to follow?
  22. Replies
    3
    Views
    2,038

    this is airlock i normally see in my projects....

    this is airlock i normally see in my projects. corridor, airlock and lab. airlock has two doors, one to corridor and one to the lab. see if the lab is controled to be negative(-), the corridor is...
  23. Replies
    3
    Views
    2,038

    psu104, I am not sure what you are doing. When I...

    psu104, I am not sure what you are doing. When I am balancing an airlock, normally, we will count the doors connected with the airlock, rule of thumb, one door 100 cfm. If this is a positive airlock,...
  24. Thread: mixed air stat

    by ceng
    Replies
    10
    Views
    899

    I don't think this sensor is a mixing air stat....

    I don't think this sensor is a mixing air stat. it is more likely to be discharge. the engineer might want to modulate the damper and the dx coil stage to get the desired discharge temp. Are there...
  25. Replies
    17
    Views
    14,792

    triton99: if gladstone is asking the flow rate,...

    triton99: if gladstone is asking the flow rate, it is 3 gpm/ton,what I said 3 gallon/ton is for column. YOu have to have enough volumn in a chilled water system for the chiller control function...
Results 1 to 25 of 41
Page 1 of 2 1 2
Comfortech Show Promo Image

Related Forums

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