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  1. Thread: Deli case

    by firstmech
    Replies
    4
    Views
    713

    should of been does he have his meat wrapped.

    should of been does he have his meat wrapped.
  2. Thread: Deli case

    by firstmech
    Replies
    4
    Views
    713

    rule of thumb, the evap should be 10 to 15 degees...

    rule of thumb, the evap should be 10 to 15 degees below the case temp. not much you can do about the humidity, the refrigeration is going to take the moisture out of the air. does he have his meat....
  3. Replies
    1
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    681

    Yes this is comonplace. There is many...

    Yes this is comonplace. There is many manufactures of CO monitoring systems Armstong is one of the more popular

    http://armstrongmonitoring.com/

    Most systems use a sensor or multiple sensors...
  4. Where microprocessors are not used we typically...

    Where microprocessors are not used we typically find basic elecctromechanial circuits and relays with intergrated safety lockout circuits requring manual reset of the control or main power circuit...
  5. Replies
    19
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    3,302

    Operator, Regarding how to select the proper...

    Operator,
    Regarding how to select the proper fixed sheave generally to get you in the ball park if your system is operating within spec. note the belt type (A, B, 3L, 4L, ect.) this will give you...
  6. Yes and No, It all depends on the manufacture and...

    Yes and No, It all depends on the manufacture and the model. Microprocessor are more commonplace in the last few years especially on the higher end models. As for equipment price wars you will still...
  7. Replies
    19
    Views
    3,302

    I agree with rubobornot, our policy is to replace...

    I agree with rubobornot, our policy is to replace all adjustables with fixed. If you are into prevenatative maintenance agreements the new fixed sheaves will save you $$. Not to mention trying to...
  8. Replies
    49
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    3,575

    I agree with absrbrtek, stay with water cooled I...

    I agree with absrbrtek, stay with water cooled I am assuming your system has a cooling tower, therfore the most economical means of heat transfer is a water cooled condenser. we have used...
  9. Replies
    7
    Views
    1,496

    Hi welcome, simply do a search on this forum,...

    Hi welcome, simply do a search on this forum, both these topics are very popular and there has been multiple threads on both with good, accurate detail.
  10. Replies
    8
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    2,368

    I would definitely use a seperate time initiated...

    I would definitely use a seperate time initiated time termanated defrost clock, especially if you are running your box below 40 deg. (It will pay for itself if it reduces the need for 1 manual...
  11. Replies
    8
    Views
    956

    I am just recovering from major back surgery...

    I am just recovering from major back surgery spinal thoracic fusion (4 vertebrae removed and titanium cylinder inserted and attached with screws to my remaining vertebrae) this was all due to blowout...
  12. Been there also, I agree with the others as most...

    Been there also, I agree with the others as most probably caused by bacteria and condensate. We have cleaned the evaps and then followed up with a biocide rinse of the coil. This seems to have...
  13. Replies
    8
    Views
    2,368

    Yes there is a anti short cycle delay option (ASD...

    Yes there is a anti short cycle delay option (ASD in the menu) the delay is adjustable from 0 to 12 minutes. The delay begins when the unit is first powered up and then after an "on" cycle ends.
    ...
  14. Replies
    19
    Views
    1,611

    As you mentioned the compressor was replaced I...

    As you mentioned the compressor was replaced I think you should begin there. An incorrect undersized compressor would provide the conditions you stated. If that checks out you are back to refrigerant...
  15. Thread: R-500

    by firstmech
    Replies
    5
    Views
    782

    Sorry, I missfired should be 401 "b" nor "a" as...

    Sorry, I missfired should be 401 "b" nor "a" as icemeister pointed out.
  16. Thread: R-500

    by firstmech
    Replies
    5
    Views
    782

    The recommended replacemet as far as internm...

    The recommended replacemet as far as internm goes, would likely be MP66 (R-401a) depending upon your application you may not have to change the oil and if you do 1 compresor oil change to alkabenzene...
  17. Replies
    3
    Views
    809

    You did not state the subbase model or if the...

    You did not state the subbase model or if the second stage heat relay of the unit is actually being energized.
    Most Honeywell T300 series stats indicate power on the switched terminals (They call...
  18. Replies
    15
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    1,695

    Val, regarding rates I can't comment on central...

    Val, regarding rates I can't comment on central or western Canada but here in the Atlantic provinces HVAC charge out rates for most National contractors range from $60 to $85 per hour on average....
  19. Replies
    15
    Views
    1,695

    Just wondering how the rates compare in the US...

    Just wondering how the rates compare in the US for Refrigeration compared to Air Conditioning (don't post actual rates).Up here in Canada Refrigeration has always been around the $10.00 or less per...
  20. Thread: tutco vav

    by firstmech
    Replies
    9
    Views
    2,092

    I am not sure about Tutco elecrtic heaters but...

    I am not sure about Tutco elecrtic heaters but most others have air pressure diffential controls that are wired in series with the heater control circuit.
    Therfore disabling the heater in a low...
  21. Replies
    8
    Views
    896

    I think as the other members have mentioned most...

    I think as the other members have mentioned most suppliers have some margin of error incorporated into thier load calculations and equipment selections.
    Equipment capacities rarely exactly match...
  22. Hi ColdT, We have been using the Johnson...

    Hi ColdT,

    We have been using the Johnson Control MR series, the MR4 would fit the application you are decribing, Pretty much the same control as the Sporlan (as posted by icemeister).

    One...
  23. Replies
    10
    Views
    1,430

    One more thing you may want to check with the...

    One more thing you may want to check with the evaporator that is causing the ice build up problem is the condensate drain:
    - Makes sure it is not restricted.
    - Ensure it is trapped (outside the...
  24. Replies
    8
    Views
    805

    Not sure if this would be any help, but we had a...

    Not sure if this would be any help, but we had a similar problem estimatimg the water volume in a large building complex that sharred a common hot water heating loop.

    As the water quanity...
  25. Replies
    12
    Views
    2,053

    The bottom line is if the dehydration procedure...

    The bottom line is if the dehydration procedure is not performed completly and additional means of cleanup is not performed after the start up your customer is in for costly learning expierence.

    ...
  26. Replies
    8
    Views
    1,490

    Hi Jt65, not alot of information given, but from...

    Hi Jt65, not alot of information given, but from what you are saying, if it is a true vertical closed loop, sounds like your information is based upon the heating mode so:
    - Water pressure sounds...
  27. Replies
    3
    Views
    529

    Sounds like you have a good aproach, Up here in...

    Sounds like you have a good aproach, Up here in Canada (at least in our area) we see a lot of infloor radiant heat.
    Garages typically have high ceilings and are hard to heat with forced air.
    ...
  28. A past co-worker of mine had a similar situation,...

    A past co-worker of mine had a similar situation, his daughter had dropped a diamond ring down a vent in the kitchen floor ending up in ductwork above a finished basement ceiling.
    It had been...
  29. Thread: Vav systems

    by firstmech
    Replies
    3
    Views
    716

    Hi Skull, I dont recall the r78-2 number but I...

    Hi Skull, I dont recall the r78-2 number but I suspect the controllers are probally KMC take a look at the following links:

    General Link:
    ...
  30. Replies
    17
    Views
    1,501

    Typical design around here is the make up air...

    Typical design around here is the make up air system provides 85% make up compared to exhaust total. The remainder make up is through the hvac system ecnomizer. This can be as simple as ninimum...
  31. Replies
    6
    Views
    822

    I am not expierenced with your particular unit...

    I am not expierenced with your particular unit but I suspect the reason is for lubrication of the motor, you should see the oil lube ports at the top of motor in thevposition they are decribing. I...
  32. Replies
    17
    Views
    4,635

    Can you provide us with Manufacture, part#, ect....

    Can you provide us with Manufacture, part#, ect. of them mounts? Very nice idea and look like they would make a difference in the compressor noise/vibration.
  33. Replies
    5
    Views
    2,815

    We have a similar appliction (spray booth propane...

    We have a similar appliction (spray booth propane propane fired) The Maxitrol valve does not have a high fire adjustment this is done through a seperate regulator up stream.
    Low fire is adjusted...
  34. Replies
    5
    Views
    873

    Try the fillowing link, you will need an account...

    Try the fillowing link, you will need an account to gain access, I have downloaded the info you are looking for from this site so I know it is there. If you are in a rush try your local carrier...
  35. Replies
    6
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    1,250

    Hey Kevin, most disply cases should be equipped...

    Hey Kevin, most disply cases should be equipped with a removalble perforated screen that snaps over the drain inlet to prevent large debris from getting lodged in the trap. You are correct about the...
  36. Replies
    31
    Views
    2,990

    Hey Norm, it took me a few minutes to find this...

    Hey Norm, it took me a few minutes to find this as it is not a very common control method.
    Check out Nailor Industries "Single Duct Terminals"
    pg. 16 "Control sequence 4EL Cooling with morning...
  37. Replies
    48
    Views
    3,794

    Val, keep in mind that you are closing allot of...

    Val, keep in mind that you are closing allot of doors behind you, doors that will not reopen so if the prospective job does not pan out your options are limited.
    Most employers spend alot of...
  38. Thread: Norm`s book

    by firstmech
    Replies
    10
    Views
    805

    Us guys up in Canada would like to be able to...

    Us guys up in Canada would like to be able to order this book as well, I went to the order link but it said they are not taking international orders (at this time), any reason for this?
    GB
  39. Replies
    14
    Views
    3,179

    Sorry I should add, my previous post is assuming...

    Sorry I should add, my previous post is assuming that the valve actuator operation has been verified to be normal.
  40. Replies
    14
    Views
    3,179

    Hi AC/DC, we have had similar expierence with...

    Hi AC/DC, we have had similar expierence with this style of valve, Actually repeat failures with the valve not seating properly, I called the Honeywell tech line to see if they had been expierencing...
  41. Replies
    18
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    1,787

    Thanks to all for your input. Seaboard's...

    Thanks to all for your input.
    Seaboard's observations raise some definte concerns. Sometimes the best way for a tech to learn and become more productive is to leave them alone and make them use...
  42. Replies
    18
    Views
    1,787

    This technology is comming to our area, I have...

    This technology is comming to our area, I have done some research on these phones and they sound good for our industry. Our company (commercial HVAC & R) have been using traditional cell phones and...
  43. Replies
    8
    Views
    1,098

    It should also be noted if a suction filter was...

    It should also be noted if a suction filter was added to the system for acid removal (which it should have) typically this requirement is verified by an acid test of the failed compressor oil. The...
  44. Replies
    5
    Views
    1,067

    Hey Bouncer, total system charge in theory: ...

    Hey Bouncer, total system charge in theory:
    Condensing unit Charge = 30.5 lbs.
    Air handler 4.5 lbs per circuit = 9.0 lbs.
    7/8 liquid 55 ft.@ 0.226 lbs/ft = ...
  45. Replies
    14
    Views
    1,688

    70 to 90 for boiler/cooling tower application, in...

    70 to 90 for boiler/cooling tower application, in some cases it depends upon the type of heat pump and the water flow through the heat pump I believe flow rates should be 3gpm per ton as standard and...
  46. Replies
    5
    Views
    888

    Yep, same problem. I know of at least 2 the...

    Yep, same problem. I know of at least 2 the second ended with the blade ripping through the condenser. We had Our failure covered under warranty by Carrier. With the amount of failures you are...
  47. Replies
    7
    Views
    1,182

    I would recommend the new Honeywell Vision Pro...

    I would recommend the new Honeywell Vision Pro series, our company likes to promote only thermostats that offer the features you are looking for. The Vision pro I believe offers 3 versions 1)...
  48. Replies
    11
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    1,141

    You may want to visit this site...

    You may want to visit this site http://www.arnegdml.com/english/produits.aspx
    We have used the Brema glass door cases and find them very compareable to the Hussman, Hill,ect. Good qulity, attractive...
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