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  • Users: xnetfly
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  1. xnetfly

    1% of Full Scale

    So I have been reading specifications for some time now and the controls language still seems to baffle everyone. Can someone tell me what the exact meaning of 1% of full scale. Let's say I have a 50-100F temperature transmitter. If I measure 57 and the sensor is reading 55 that is a 2 degree...
  2. xnetfly

    Controls: Open or not? do we care!?

    Ok.. So I have had a number of controls contractors (Too many) coming in to my office pitching the idea of open protocol and different open market controllers. My question is.. is there really such thing as an OPEN PROTOCOL controller? My analogy : Linux Open Source OS, Windows OS ...
  3. xnetfly

    CV Terminal box with reheat/ Control Valve from thermostat

    We are looking at controlling a room with a CV terminal box (venturi) and trying to figure out how to most cost effectively control the reheat valve. From my surface level search it seems there are thermostats that provide a 4-20 mA signal to control a valve. What are the cost implications...
  4. xnetfly

    4160V Generator Marathon (MTU) Failed during start up

    From what I understand it seems that an eletrical sub provided a 4160V backup generator for the new addition at a hospital. When they performed the start up of the generator it failed electrically. It seems this generator was put together in phases by MTU. Fabricated the enclosure in Florida...
  5. xnetfly

    Building hot water system form central plant (Delta T)

    We are a large pharma company with a section of campus that is operating off of a central boiler hot water system. This is a secondary and primary loop situation. The boilers are producing 100 GPM of 175F water to the buildings. However, during the summer the building is not using (or very...
  6. xnetfly

    Cooling Tower Pressure Transmitter - Freeze Protection

    We have a situation at one of our plants where the cooling pressure transmitter sensing unit seems to be freezing. This has been an on going problem. The pressure transmitter is located on the cooling tower condenser header to the spray nozzles where it controls a valve to provided the needed...
  7. xnetfly

    AAON Heat Pumps HELP

    We are having some trouble with the rooftop units that were installed when the new facility opened a few years ago. The units are three AAON rooftop heat pumps. Two units are split, one is a package unit. All have dual compressors. The first stage compressor in each system has hot gas...
  8. xnetfly

    Building Pressurization FMA-900 Control??

    We currently own a building that uses a FMA-900 (omega) mass flow meter to control building pressurization. The documentation shows this meter as being bi-directional meaning that it will show the same number on the positive or negative side with no indication of negative building...
  9. xnetfly

    Emergency Generator Exhaust air fan... Wiring in power conduit?

    I am a design engineer working on a project that has been constructed. I have a question concerning the wiring for an exhaust fan in the emergenerator room. There is a control circuit coming from the emergency generator to the exhaust fan which is wired in the same conduit as the power wiring...
  10. xnetfly

    Refrigeration Systems

    Ok..Honestly I no nothing about Refrigeration systems but I would love to learn. I have a project coming up for a school that will have a refrigeration system involved. What are some of the things to look out for? Any lessons learned on Refrigeration systems that you guys think are need to...
  11. xnetfly

    Carbon Dioxide sensors....

    I would like to test the carbon dioxide sensors in my building. What would be the best way of going about this? What are the normal pratices for verifing a carbon monoxide sensor is working properly?
  12. xnetfly

    FCU Trane units

    I am working on a apartment complex that uses one FCU per room. The FCU's are TRANE FCU's with chilled water coil and hot water coil and two 2-pos control valves.The control stat just shows setpoint temp, speed of fan and on/off. There is no swap over from heating to cooling at all on the stat...

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