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  1. Replies
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    Automated logic ZN551 controller

    Hello, I'm trying to get heat to a classroom heat pump it runs off of automated logic. Problem is when I log onto WEBCTRL I'm getting question marks. I get a message that says download parameters,...
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    1,055

    Automated logic

    Hello I'm working at a high school that uses automated logic DDC, I cannot make any changes to setpoints, vav boxes etc... Or even monitor what's going on because all I'm getting are question marks....
  3. Thread: R22 drop in

    by etheric999
    Replies
    5
    Views
    529

    R22 drop in

    Hello, I've never used any of the r22 drop in replacements, what is the procedure any parts or oil to change in the retrofit, and what is the best one out there? Thanks
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    619

    Mcquay ALS Chiller problem

    Mcquay ALS chiller problem
    Working on a mcquay ALS Chiller,as i check alarm history, first I got an alarm saying no 5 vdc, then another alarm saying bad evap leaving water temp sensor, then another...
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    544

    Ice machine float valve

    Hello I got a call today for an ice machine not making ice. It's a Hoshizaki KM 500 MWE, I cleaned it really good and turned it on nothing happened, no water flowing. I checked the float valve seemed...
  6. Thread: AAON unit

    by etheric999
    Replies
    7
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    1,014

    AAON unit

    Hello, I'm working on an AAON rooftop unit model 66106, I've got a bad fan cycling switch it seems, the switch is a wilspec HS 300-28-0013. My question is are these switches schraedered, or am I...
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    504

    Honeywell Modutrol Motor

    Hello I have to replace a mod motor IV
    From what I hear its not just a simple drop in, you have to set these things up, any help on the that process would be helpful. Thank You
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    550

    Mcquay rooftop unit

    Had to check a mcquay rooftop unit model RPS, tries to start and goes out on flame failure. The maintenance guy says that it will only fire if he cover the inducer fan intake, anyone ever run into...
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    1,401

    Thank you

    Thank you
  10. Replies
    11
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    1,401

    Automated logic

    Hello, working at a school that has automated logic BMS. I've got a whole section of the building with no communication, the computer graphics show up but I get no input reading, just a bunch of...
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    757

    Thank you guys

    Thank you guys
  12. Replies
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    757

    TXV Problem?

    Good morning working on a rooftop split trane unit, pretty old piece of equipment. My partner changed two solenoid valves and 2 TXV's, problem is he sends me to charge it and I notice 1 of my TXV's...
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    659

    trane voyagers

    Hello, i have to change the high pressure switch on a trane YCD unit,are the hi side pressure ports on these units schradered ?
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    1,198

    The drive is bad, are the vfd's difficult to...

    The drive is bad, are the vfd's difficult to replace,ive seen it done working with a co worker,but not sure about setting the parameters, and everything?
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    1,183

    Swimming pool hvac

    Hello, I have a corroded air handler in a school for heating the pool area, it has to be replaced, any suggestions on equipment that can handle the chlorine, also I am thinking about putting some...
  16. Thread: Mcquay RPS

    by etheric999
    Replies
    4
    Views
    571

    Don't have the model # offhand but it uses...

    Don't have the model # offhand but it uses microtech controller
  17. Thread: Mcquay RPS

    by etheric999
    Replies
    4
    Views
    571

    Mcquay RPS

    Hello I have to change filter driers on a mcquay rooftop package unit, can I pump down, de energize the solenoid, close that valve at the corner, and hope the solenoid don't leak, I'll recover if I...
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    442

    Boilers, burners, combustion

    Hello, I'm trying to learn more about burners and combustion, any good classes in the nj/pa/ny area, any good books out there?
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    hvac problem or electrical ?

    i have a building with a ton of florida heat pumps,cooling tower, and heat exchanger,heat is rejected into the hot water loop from the heat pumps and the heat exchanger transfer the heated water into...
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    630

    Jumped out the TD the compressor started up,I'll...

    Jumped out the TD the compressor started up,I'll replace it tomorrow.
  21. Replies
    2
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    630

    Mcquay time delay

    Working on a mcquay rooftop package unit 4 stages of cooling calling but the compressor will not start. I checked voltage at the time delay I had no voltage going to terminal 2 or 1, terminal 3 is my...
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    2,767

    Liquid line sweating

    Working on a mr slim unit today and glanced over at the mcquay rooftop unit and noticed the liquid line sweating after the liquid line filter pass the solenoid, I'll check it out further tomorrow...
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    377

    Side by side whirlpool

    Hello I'm a hvac tech doing mother in law a favor checking out her fridge. Freezer is cold and there is cold air coming from the top vent in the fridge compartment. I noticed there is a vent closer...
  24. Thread: ice machine

    by etheric999
    Replies
    11
    Views
    805

    ice machine

    hello working on an ice machine scotchman prodigy modular cuber model #C0630SA-32A. Initially it was not getting water so, i changed the filter and and cleaned everything up.unit ran and produced ice...
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    1,487

    the boilers supply several air handlers, and...

    the boilers supply several air handlers, and supply two large storage tanks for domestic hot water.
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