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Type: Posts; User: jack marcotte

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  1. Accutherm Therma-Fusers any Field Experience Good or Bad?

    I am looking at Therma-Fuser installations that serve conference room (s). It does not work well and many occupant/user complaints. The Conference rooms are relatively small and have about four to...
  2. You are right. Nothing has changed. Thanks for the reply.

    The Accutherm Therma Fuser seems to have caught on because of the "Green Movement". They (designers) see them as the ultimate VAV box for very small zones, thus creating high levels of comfort for...
  3. Jack Marcotte

    thanks for the reply. If we correct the problems we will take the themafusers out. It is a brand new installation and the incompatibility of the thermafusers with the HVAC objectives have become...
  4. Accutherm's Thermafusers? What is going on?

    We are having negative experience with the Thermafusers and the way they operate as a "VAV" system. The obvious need for just .250 inches of sp within the duct creates some obstacles. Does anyone...
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    Expansion Tank Air control vs Air Elimination

    Don't waste money on putting in a plain steel tank. Review the values and benefits of a Bladder tank on pump efficiency and pipe corrosion protection. You want to eliminate air not control it. ...
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    Hydrotherm KN Boilers, Feedback

    Anyone had experience with the KN boilers by Hydrotherm? I would be interested in any comments from the field on these condensing boilers. Good or Bad. Thanks.
  7. N30?. Has no sensor inputs! That information is...

    N30?. Has no sensor inputs! That information is coming from other network devices such as a DX 9100. If the information is bad you would have to at least check the controller that it is coming...
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    Hydrotherm KN Boilers, Feedback

    Does anyone have experience with the Hydrotherm KN series condensing boilers. Good and or Bad experience I am interested in hearing about it. Thankyou.
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    Gasmaster

    The Gasmaster GMI 4M may have serveral "kinks" . Gasmaster modified the Riello burners on some of their models predating '05. Consequently the "Riello" burners are not Riello but a modified burner....
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    Gasmaster, Slim

    Yes, it is a water tube, low mass condensing boiler. It also has a direct flame impingement design on the water tubes that are stainless steel. That would/could promote tube cracking and I believe...
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    Jack Marcotte

    Have experienced burner problems with the Riello burners with component failure. Riello, however does not accept the problem as a warranty problem because the components that were failing were...
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    What's impossible?

    :)

    Knowing what you know or not knowing what you think you know. Both are possible.

    Yep, its jack from cj.
  13. Burner Pressure Fault?

    You don't have enough info---but this is a WAG. Look at the stack height and see if during morning start up or during the night if set back occurs the draft in the chimney will be lost when the...
  14. Domestic Water pressure

    Rip out the clayton valves, put in a check valve, install a VSD on the pump. Put in a single point PID controller with pressure transducer. Make a large P value and a small I value, and do not use...
  15. DDC control optimization of part load performance...

    DDC control optimization of part load performance on an existing 350 Ton Centravac Chiller with R123. I am looking to control this chiller to optimize part load performance efficiency. I will be...
  16. Looking for suggestions on optimazation of...

    Looking for suggestions on optimazation of control of a 350 Ton Centravac Chiller with R123 (approx 10 years old) . What are some of the most efficient control schemes that will work for this...
  17. I want to interface a DDC controller output to a...

    I want to interface a DDC controller output to a Trane 30 Ton Voyager RTU . I understand that I should be able to get a discharge air temp. reset with return air temp. by using a resistance imput in...
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    Tridi--? Going Going Gone

    I am starting to see the handwriting on the wall. The controls industry will soon be over run by the IT industry and it will be dominated by Web Services and XML. 10 years from now we won't even...
  19. I want to integrate some JCI controls with an...

    I want to integrate some JCI controls with an Automated Logic front end. Are their any Automated Logic experts out there that can get me going in the right direction. I am specifically looking for...
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    We have taken some Staefa Smart II VAV box...

    We have taken some Staefa Smart II VAV box controllers off a job site. Other than the local staefa dealer who wants to steal them does anyone know who is in the market for used Staefa DDC Controls. ...
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    We are renovating a older Staefa VAV Box DDC...

    We are renovating a older Staefa VAV Box DDC control system and have about 34 Staefa Plenum rated Smart II VAV box control modules along with the sensors. The Staeffa system was about 15 years old....
  22. Additional comments: a 135 Ohm slide wire...

    Additional comments: a 135 Ohm slide wire controller requardless of make or model should be able to be controlled with a 4-20 ma control signal and two properly sized resistors. Keep in mind the ma...
  23. OK, thanks for the comments I do have a solution...

    OK, thanks for the comments I do have a solution and I will send it (The Schematic) when I get done with the job. Just wondered if anyone had a better solution. Mine costs less than 5 bucks in...
  24. Does anyone know what the wiring scheme with...

    Does anyone know what the wiring scheme with resistors is to convert a 4-20 ma signal to a 135 ohm slide wire control to control a 135 Ohm actuator. I know a converter can be bought but I would like...
  25. re Thermo: Thanks for some good practical info. ...

    re Thermo: Thanks for some good practical info. I will
    probably have to use it.
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