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  1. Replies
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    Three-Phase small Commercial

    tankmdg

    In small Commercial, there are two types of three-phase power available.
    The first is the 208/120 volt, three-phase, four wire wye system.
    The second is the 240/208/120 volt high-leg,...
  2. For 2,000 cfm's to have enough return air, you...

    For 2,000 cfm's to have enough return air, you need two 20 x 25 return grills.
  3. Replies
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    Gan Why don't you try Atlas A/C & Electric. ...

    Gan

    Why don't you try Atlas A/C & Electric.
    They are looking for Technicians.
  4. Replies
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    895

    It could be considered to be South Texas. From...

    It could be considered to be South Texas.
    From San Antonio,Texas all the way down to McAllen,Texas in the Magic Rio Grande Valley.
  5. Thread: Cfm

    by conaire-one
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    This is the Formula: CFM = BTU/H divided by...

    This is the Formula:

    CFM = BTU/H divided by Temperature Rise x 1.08

    But to get the right answer need to multiply btu's by sensible heat factor.

    Sensible heat factor = calculated sensible...
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    And you guys have not mention the biggest factor ...

    And you guys have not mention the biggest factor coming up soon? The Court System of United States of America is going Green now!!
  7. Replies
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    3,437

    Agreed!!

    Agreed!!
  8. Replies
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    3,437

    Like somebody said it here in this Forum!! ...

    Like somebody said it here in this Forum!!

    Dupont patent of (R-12 and R-22) are over. Now they want the Billions of dollars of Profit, for the Patents of the newer Refrigerants. Specially of the...
  9. Replies
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    I am sorry too!! But the EPA card does not...

    I am sorry too!!

    But the EPA card does not qualify anybody to troubleshoot and or charge a system! Even if it is the neighbor.

    You are the one who is out of line by saying that because he is...
  10. Replies
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    7,644

    Is this a trick question??? Do you endorse...

    Is this a trick question???

    Do you endorse venting!!!

    Do you endorse any not qualified person playing with your expensive R-22 or R410A equipment. :p
  11. Replies
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    7,644

    RLetts The hack owner should report you too,...

    RLetts

    The hack owner should report you too, Because , as you said you are not qualified to be charging a system ( Superheat Method or not).

    So either get a Life or get a Job.
  12. Replies
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    In this case NO! the Industry has not changed. ...

    In this case NO! the Industry has not changed.

    Major Manufacturers in agreement with Goverment are pushing so hard for the Blend of R-410A.

    Why do you think they raise to 13 SEER, Mandatory....
  13. Replies
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    6,494

    Piston simply will not work with R-410A, since...

    Piston simply will not work with R-410A, since pistons are pressure dependent.

    Great! so let get rid of that high priced blend R-410A.
  14. Replies
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    Covering letter

    There are two simple rules which should apply in almost all circumstances:

    Never send an application without a covering letter;
    Never send the same letter twice.

    A well-written covering letter...
  15. Tim When you said, there are opportunities...

    Tim

    When you said, there are opportunities there in the assembly plant at Selma, TX Can you explain a little more about those opportunities.
  16. Carnak Why! do you have to pay membership? ...

    Carnak

    Why! do you have to pay membership?

    The one who really won the membership, is the inspector! :D

    How the local inspector interprets it;(Code) it usually the final say.
  17. Replies
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    3,572

    Resistance Heater Elements NEC Table 310.16 ...

    Resistance Heater Elements

    NEC Table 310.16

    15 KW's = 62.5 Amps ---6 Awg = 65 Amps (75 C- 167 F) 75 Amps (90 C- 194 F)
    10 KW's = 41.6 Amps ---8 Awg = 50 Amps (75 C- 167 F) 55 Amps (90 C- 194...
  18. Replies
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    3,572

    Wire size is determined by the overcurrent...

    Wire size is determined by the overcurrent (Breaker) size, which is determined by the Unit ampacity. The Unit should have a minimum and maximum circuit ampacity listed on its Nameplate.
  19. It seems that whenever idontgetit wants to getit!...

    It seems that whenever idontgetit wants to getit! he will completely knock-down the 50% that disagrees against him.:D :D
    And thats a fact!
  20. Replies
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    Yes, your Primary condensate drain is connected...

    Yes, your Primary condensate drain is connected at lavatory side of trap.
  21. Replies
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    2,225

    Formulas:

    CFM= BTUH divided by 1.08 x (db - leaving db)

    CFM= BTUH divided by Temperature Rise x 1.08

    Filter Sizing
    Square feet of filter area = CFM divided by 300
  22. Table 110.26(A)1

    Orlandtech here it goes!

    Provides requirements for clearances away from the equipment, based on the circuit voltage to ground and whether there are grounded or ungrounded objects in the...
  23. Sir I did not wrote the rules and regulations, I...

    Sir I did not wrote the rules and regulations, I only enforce them.
  24. IRC E3305.1. Working space and clearances. ...

    IRC E3305.1. Working space and clearances. Access and working space shall be provided and maintained around all electrical equipment to permit ready and safe operation and maintenance of such...
  25. IRC Definitions Equipment. A general term...

    IRC Definitions
    Equipment. A general term including materials, fittings, devices, Appliances, fixtures, apparatus, and the like used as a part of, or in connection with, an electical installations....
  26. BOCA, Illinois- ICBO,California- SBCCI, Alabama. ...

    BOCA, Illinois- ICBO,California- SBCCI, Alabama. Merge to become ICC-International Code Council. That is the reference books along with the NEC for Building Inspectors. Here in the Rio Grande...
  27. Well I am a License HVAC/R Contractor and a...

    Well I am a License HVAC/R Contractor and a Master Electrician and ICC Certified as a Electrical and Mechanical Inspector. And also from Texas ;)

    Disconnect in Sight of Condenser IRC 4001.5 -- ...
  28. Degree Days

    Modern Refrigeration and Air Conditioning

    Chapter 19 Page 741 Section 19.6.1

    Chapter 27 Page 1050 Section 27.21

    Formula: 65 F - (high temperature + low temperature diveded by 2)
    ...
  29. Clearances around Service Equipment. 440.14...

    Clearances around Service Equipment.

    440.14 That's for the Location of Disconnect only.

    Disconnecting means: is a device or group of devices, by which the conductors of a circuit can be...
  30. Replies
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    I believe you are working with a 3-phase grounded...

    I believe you are working with a 3-phase grounded Delta; but I am not there, so here it goes.-- A grounded Delta will give 3-phase, 240v, two 120v lighting legs, and one 208v high leg to ground, and...
  31. Replies
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    My comments were about (Big) last sentences! ...

    My comments were about (Big) last sentences!
    There are no such a thing as a (High or Wild leg in one-Phase) that I know of? One hot wire 120v two hot wires 240v and ground. I am assuming that he...
  32. Replies
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    1,548

    Wire size is determinded by the overcurrent...

    Wire size is determinded by the overcurrent (Breaker) size, which is determined by the unit ampacity,.

    The unit should have a minimum circuit ampacity listed on its nameplate.

    NEC(2002)...
  33. Replies
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    1,636

    Compressor Failure? Single Phase current,...

    Compressor Failure?


    Single Phase current, two 120v hot wires and one grounded!

    3-Phase current, three phase wires carrying three currents differing in phase by 120 degrees, and one grounded...
  34. Replies
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    1watt(W)= 3.414 Btu/h 10Kw's * 3.414 = 34,140...

    1watt(W)= 3.414 Btu/h

    10Kw's * 3.414 = 34,140 Btu's
    20Kw's * 3.414 = 68,280 Btu's

    There is a difference in Wire Gauge to connect 10Kw and 20Kw
    Now with the cost of Copper wire so high!
  35. Replies
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    1,735

    A three phase transformers is constructed by...

    A three phase transformers is constructed by winding three single phase transformers on a single core.

    There are 4 possible transformers combinations:

    1. Delta to Delta- Industrial applications...
  36. Replies
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    And I repeat! If you do only visual inspections...

    And I repeat! If you do only visual inspections when doing Planned Preventive Maintenance, you are unethical to the customer, and to yourself. (Either Monthly or quarterly).
  37. Replies
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    A lot of People just does not understand the...

    A lot of People just does not understand the meaning of Planned Preventive Maintenance?

    It is a Service Agreement Proposal--A Business Contract.

    The Proposal must clearly described:

    The...
  38. Replies
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    Programmed Preventive Maintenance should be taken...

    Programmed Preventive Maintenance should be taken in a most serious way.

    It should not be considered an open door to be called upon when Equipment fails.

    The Field Supervisor should evaluate...
  39. Replies
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    Only if the Equipment is not following its...

    Only if the Equipment is not following its sequence of operation! (Is not doing its job! the way its suppose to).
    you check Subcooling, Superheat, and other Measurements.

    In Programmed Planned...
  40. Thread: I Am Angry

    by conaire-one
    Replies
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    2,096

    J3hall America so great, very doubt by...

    J3hall

    America so great, very doubt by everyday that passes, (soon to be turned in the next mexico).

    Why did you picked Mexico?

    Also notice in your Instant Messenger
    Press 1 for English...
  41. Replies
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    1,310

    Kvetko You said that Compressor was replace...

    Kvetko

    You said that Compressor was replace two times, and the problem that killed the compressors were electrical, and outside ambient temperature was 107-109 degrees, and you are from Arkansas....
  42. Replies
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    How can you get amp draw on a dead motor?

    How can you get amp draw on a dead motor?
  43. svceman Go to http://www.achrnews.com You...

    svceman

    Go to http://www.achrnews.com

    You will find very good information about Service Contracts there!
  44. Replies
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    So I guess what Munanee is really trying to say...

    So I guess what Munanee is really trying to say is this?

    The Matter is not, that if the Manufacturers were already making 13 Seer Equipment. But if the customer is really, really getting what the...
  45. Replies
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    How did you know is 1500 cfms too large? too...

    How did you know is 1500 cfms too large?
    too many cfms over
    did you made a heat load calculation.
  46. Replies
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    Walk-ins Monthly Preventive Maintenance Clean...

    Walk-ins Monthly Preventive Maintenance

    Clean condenser coils.
    Check condition of hot gas copper piping if applicable.
    Check evaporate drain pans condition.
    Check the drain piping is not clog....
  47. Thread: compressor

    by conaire-one
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    944

    Is it the overload or the low pressure control...

    Is it the overload or the low pressure control that turn off the compressor? Hot pull down situation!
  48. Replies
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    Stainless steel cold pan is design to hold...

    Stainless steel cold pan is design to hold pre-chilled (33F to 40f) Cold pan is not designed to reduce the temperature of the product. So do not place warm product (above 40F)in the cold pan.
  49. Replies
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    Low Pressure Control set too low.

    Low Pressure Control set too low.
  50. Replies
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    Yes low Refrigerant charge, or junk in the Valve

    Yes low Refrigerant charge, or junk in the Valve
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