Search:

Type: Posts; User: synergy

Page 1 of 3 1 2 3

Search: Search took 0.01 seconds.

  1. Replies
    7
    Views
    1,020

    oil return

    The unit will bring back the oil in about a weeks run time. Best load at over 60%. Make sure your oil return drier and low side line are isulated as this helpes keep the oil suspended in the...
  2. Replies
    18
    Views
    1,613

    apposed force

    The face of the damper blade has equal forse above and below the pivot point. If you can open it easy by hand then you answered the first question. 3.7 in static is high but not unherd of. It may be...
  3. Thread: Hawaiian hvac?

    by synergy
    Replies
    20
    Views
    1,691

    second choise

    If you dont take the job, please forward the details to my e mail.
  4. Replies
    18
    Views
    3,437

    its all the same

    Just bigger nuts. Dont be intimadated. Company's like young go getters as they can beat you up a little. Us old guys are to grummpy and set in our ways.
  5. Replies
    4
    Views
    635

    Yes, the inrush currant of a coil is much like a...

    Yes, the inrush currant of a coil is much like a motor, 5 to 6 times that of operating currant. A transformer can be sized to small if many loads come on at the same time. If the loads are staggard a...
  6. Replies
    4
    Views
    340

    Refrigerant level

    As the coil temperature drops the specific volume of the gas increases, this causes less pounds per minute to be circulated by the fixed volume of the compressor. The mass flow- refrigeration effect...
  7. Replies
    7
    Views
    1,671

    I would like to know what a gravity condenser...

    I would like to know what a gravity condenser coil is, though.
  8. Find the main harness that goes to the economiser...

    Find the main harness that goes to the economiser option and disconnect. ?Trace out the y1 wire and jump it back to the main compressor control circuit.
  9. Replies
    58
    Views
    4,774

    Your reasons all are sound, but I have replaced...

    Your reasons all are sound, but I have replaced maybe 5 heat exchangers in 25 years and if it is common occurance on your units it may be a design issue. Most failures I have seen are on the U bends...
  10. Replies
    1
    Views
    489

    I know a lot of guys like those analog type...

    I know a lot of guys like those analog type vacume gages, but I never could trust them. The pressure changes with any type of movement of the thermistor. I have gone to a micron gauge and put it...
  11. Replies
    2
    Views
    941

    simulate an RTD sensor

    Probably a dumb question but can I use a potentiometer to simulate a temperature to a controller. Is there a tool for just this type of thing.
  12. Replies
    11
    Views
    2,634

    Time will tell

    There in lies the rub i have not seen the this system run in all possible conditions. Thanks for your interest though as this unit has been the most challanging thermodynamic system I have worked on...
  13. The basics

    Oil anaylsis, cut the oil filter apart, vibration anaylsis, check thrust if applicable.
  14. Thread: LLSV

    by synergy
    Replies
    17
    Views
    1,829

    Buy Sporlan

    Piped in new sporlan LLSV, no problems, works as it should. The alco valve removed is shiney, clean, no appartent damage of any kind. I will go out of my way to buy Sporlan in the future.:cheers:
  15. Thread: Duct Problems

    by synergy
    Replies
    18
    Views
    1,467

    Static

    Static pressure should be at its higest at the fan exist and at its lowest at the end of the run, this is due to friction loss through the duct. The duct internal area and the number of exits need...
  16. Replies
    5
    Views
    406

    Is it dripping and tripping?

    Is the oil on the floore from the drip, or is the real problem the oil trip. Does it drip befour it trips. Is there oil in the compressor. Define the "high pressure valve" and why is it restricted.
  17. Replies
    11
    Views
    848

    More info

    Closed loop system, or are you talking city water supply, ground water, ect. How could you use more water? Air will take up the effective surface area of the condenser and raise the head pressure....
  18. Replies
    14
    Views
    877

    Low air flow

    A 27 degree delta T across the evaporator is a problem. Air flow sounds low, check the fan amperage and compare to the other units that are running ok pressures. Depending on the coil arrangement,...
  19. Thread: LLSV

    by synergy
    Replies
    17
    Views
    1,829

    Stem down

    The valve will operate normally with a lower pressure differencial. At 225 psig head and a 60 psig suction it will close off, pump down like normal to 30 psig, compressor shuts off on low pressure...
  20. Thread: LLSV

    by synergy
    Replies
    17
    Views
    1,829

    Thanks

    Will replace, dissect, and report.
  21. Thread: LLSV

    by synergy
    Replies
    17
    Views
    1,829

    Sporlan sounds good

    I may have to go the Sporlan route, pain in the butt to replace at this point, but don't know what else to do. The alco valve has a little round diaphram and a spring. Not to sure on how it works....
  22. Thread: LLSV

    by synergy
    Replies
    17
    Views
    1,829

    In the right direction

    The arrow on the valve is pointed to the TXV, it is in the right way. Don't know what caused the original failure, but this problem is on my short list. It is like 200 PSI Diff is the maximum it can...
  23. Thread: LLSV

    by synergy
    Replies
    17
    Views
    1,829

    In the right direction

    The arrow on the valve is pointed to the TXV, it is in the right way. Don't know what caused the original failure, but this problem is on my short list. It is like 200 PSI Diff is the maximum it can...
  24. Thread: Duct Problems

    by synergy
    Replies
    18
    Views
    1,467

    No static man

    Sounds like you have no static pressure. Too many openings or too many air exits to allow for static pressure to build up and push the air out of the closest registors. Close down some of the dampers...
  25. Thread: LLSV

    by synergy
    Replies
    17
    Views
    1,829

    more info

    Water to water heat pump chiller, one of a kind I think, runs head pressure of 275Psig for hot water to the A/H of 105 degrees. Compressor had failed,after replacing I found the LLSV would at times...
  26. Thread: LLSV

    by synergy
    Replies
    17
    Views
    1,829

    LLSV

    Is there a maximum pressure differencial of a LLSV. Application runs 275 head 60 suction and the stinking solnoid valve sticks open unless the delta P is lower at around 225 head, 60 suction. Brand...
  27. Replies
    13
    Views
    1,122

    higher resistance

    Typically a lock out relay has a higer resistance than the control relay and is wired in parallel with the normally closed safty devices and control relay. This keeps the lock out relay from...
  28. Replies
    11
    Views
    2,634

    My chiller is a monster

    Two 15 ton scroll compressors on a water cooled reverce cycle chiller, that provides water heat to the A/H in winter, And cooling water to the air handler in summer. When the weather changes and the...
  29. Replies
    11
    Views
    2,634

    looks like I got me a one of a kind rig here....

    looks like I got me a one of a kind rig here. Nobody seems to have seen one of these. Water to water, reverse cycle, heat pump chiller. Just my luck.
  30. Replies
    14
    Views
    1,687

    Maybe clock the gas meter with just the oven on....

    Maybe clock the gas meter with just the oven on. Do the math. Boom.
  31. Replies
    11
    Views
    2,634

    Its looking bad

    Yep, both the engineer and the chiller manufacture are out of buisness. That should tell ya something. I have been doing a lot of math and going by the Copeland compressor information I could have 4...
  32. Replies
    11
    Views
    2,634

    Sorry, yea there are four 2 inch supply and 4 two...

    Sorry, yea there are four 2 inch supply and 4 two inch return lines coming out of the ground. They tie into a 5 inch header pipe and then to a 3 inch building loop supply and return.
  33. Replies
    11
    Views
    2,634

    Hellow... anybody out there. I realise now that...

    Hellow... anybody out there. I realise now that my original post was kind of vague. I have learned alot in the last few days so let me run this by you. My vertical ground loop has 28 holes at 215...
  34. Replies
    11
    Views
    2,634

    New to the Geo thing

    Recently got a job with Geo thermal vertical ground loop system. It has 8 heat pumps in the 3 to 5 ton range and a 30 ton chiller all runnig off the cooling or heating affect of the ground loop. The...
  35. Replies
    9
    Views
    1,202

    update and a question

    So I finally make it back to look into this ground fault problem. Tore everything apart, meggered, wiggled, pulled ect. Put it all back together and ran the drive. As I am checking the amps it trips...
  36. Replies
    11
    Views
    2,062

    This was back in 1985 but unless things have...

    This was back in 1985 but unless things have changed, LA trade tech is a community college and they are free to any one who has lived in the state for over a year. The cold side is for HVAC service,...
  37. Replies
    11
    Views
    2,062

    Sorry did not meen to be confussing. The year I...

    Sorry did not meen to be confussing. The year I came in to the apprenticship there was a total of 65 brought in. That was on the cold side, there may have been many more that came in on the hot side....
  38. Replies
    11
    Views
    2,062

    I tried to get into the LA local for two years,...

    I tried to get into the LA local for two years, went to LA trade tech in the meen time. Then got in. 63 fellow apprentices turned out that fifth year.
  39. Replies
    14
    Views
    906

    His other return ducts going into the atic space...

    His other return ducts going into the atic space kind of through me off a little.
  40. Worked on couple of desert air units and I might...

    Worked on couple of desert air units and I might as well been woking on the space shuttle. They had a metasis controller and a remote interface panel. if I remember correctly you control to 2 degrees...
  41. Replies
    14
    Views
    906

    What does closed loop mean. Are they not ducted...

    What does closed loop mean. Are they not ducted back to plenum? They should be.
  42. Replies
    9
    Views
    1,202

    Going back this week customer said it tripped...

    Going back this week customer said it tripped three times then ran for three days straight with out a problem. Thought maybe moisture was an issue, took conduints apart in some places looked for...
  43. Replies
    7
    Views
    1,172

    To many resons to list. Could be moisture or...

    To many resons to list. Could be moisture or sludge from poor service. Could be motor windings comming off. But what ever it is you will be buying a new condensing unit soon. So at least that problem...
  44. Replies
    9
    Views
    559

    I keep saying it and I feel like I am preaching...

    I keep saying it and I feel like I am preaching but why not try the local union apprentiship.
  45. Replies
    21
    Views
    1,547

    The original post reports a 100 volt drop on...

    The original post reports a 100 volt drop on start up in bypass. Defently something wrong there. Hence my thought of the spinning motor being an issue. But your right i have seen many a motor start...
  46. Replies
    21
    Views
    1,547

    Maybe try stopping the return air fan from...

    Maybe try stopping the return air fan from spinning and then trying to start it in bypass. Could be some krazy back EMF thing caused by the generator effect of the spinning motor.
    I am hung up on...
  47. Replies
    21
    Views
    1,547

    What controls the speed signal to the return fan...

    What controls the speed signal to the return fan vfd. Where is the contactor for the return air vfd that is shutting off. Is it in the drive or external. You say the return fan will start in vfd with...
  48. Replies
    5
    Views
    675

    How about a make up air unit with a variable...

    How about a make up air unit with a variable speed drive. You could control it to building static pressure. Check out this web sight www.tcsbasys.co. It is a no thrills building static controller...
  49. Replies
    9
    Views
    1,202

    Toshiba ground fault

    This is a new drive model Q9440IER3 toshiba. The customer reports it trips out on ground fault though i have never seen it do it. All the line side and load side wiring has been meggered and is good....
  50. Replies
    2
    Views
    779

    Your resourses are a phycrometric chart a...

    Your resourses are a phycrometric chart a calculator an amprobe and some test and balance reading material. Your example is poor due to the unit malfuctioning.There are also to many variables in your...
Results 1 to 50 of 136
Page 1 of 3 1 2 3
Comfortech Show Promo Image

Related Forums

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