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Type: Posts; User: sean88

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  1. Replies
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    I actually saw one explode last week.

    I actually saw one explode last week.
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    The return is for the second floor only, it's 10"...

    The return is for the second floor only, it's 10" not 8. There is a 14" round return serving the 1st floor, which didn't show up in the picture. The orginal system didn't even have balance dampers...
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    Here are the pictures..

    203

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    206

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    American Standard Change Out

    Here are some pictures of an old Rheem we changed out to an AS 80 MBH 2 stage 90 + gas furnace with a HP. Replaced duct board with hard duct and installed a Perfect Fit Air Cleaner.
  5. I too agree with doc. As an engineer we used to...

    I too agree with doc. As an engineer we used to "Parkerize" Carrier systems with Parker zone dampers. We didn't use by-pass dampers since the compressors could be damaged by low load conditions. ...
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    Just installed a brand new Trane 13 SEER heat...

    Just installed a brand new Trane 13 SEER heat pump. Lo and behold when I went to start it up, nothing happened. I found the HPS was bad. I'm a Trane dealer and haven't run into any problems with...
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    Double check your setup. In the configuration...

    Double check your setup.
    In the configuration code
    170 set to 7 2 heat/1 cool heat pump
    200 set to 1 fossile fuel is back up
    310 increase your deadband to 5 F
    340 set to 2 outdoor temp sens used...
  8. Thread: Load Calc

    by sean88
    Replies
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    968

    Use 1.5 watts/sqft for lights and 1 watt/sqft for...

    Use 1.5 watts/sqft for lights and 1 watt/sqft for equipment. You could look at the nameplate data for the equipment, sometimes they have the rate of heat rejection.
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    no magnet. first thing i checked

    no magnet. first thing i checked
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    I was called on to start a McQuay RDT075 RTU last...

    I was called on to start a McQuay RDT075 RTU last week. I get to the job and find the unit had sat for over 2 yrs! The building is spec office building and they finally leased out the space the RTU...
  11. Thread: Honeywell F50F

    by sean88
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    1
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    813

    I've got a Honeywell F50F electrostatic air...

    I've got a Honeywell F50F electrostatic air filter. I put a brand new cell in the unit 6 months ago. Went back for a PM to clean it, it's used in a heavy smoking area. I cleaned it with nu calgon...
  12. Thread: BacTalk

    by sean88
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    2,409

    I specify them on every commercial job I design. ...

    I specify them on every commercial job I design. Owners love it, very simple to use.

    The pro's are:
    good graphics
    easy to modify graphics and schedules

    con's
    trend logs are "weird" it...
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    YES, no matter how well you try to filter the...

    YES, no matter how well you try to filter the dust, it will collect on the coil. I see this all the time in commercial buildings. I've seen GC turn on the roof top unit before any windows are...
  14. Look at it this way, does your doctor give you an...

    Look at it this way, does your doctor give you an exam over the phone?

    Not to mention the liability factor. It is dangerous from a liability stand point to give advice over the phone.

    When...
  15. You don't think it's fair to pay a service guy...

    You don't think it's fair to pay a service guy $200 to flip a breaker?! Give us a break (no pun intended). Let me ask you, would you take off to drive 15-20 min during working hours, spend 30-45...
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    Did you contact the BBB? I don't know where you...

    Did you contact the BBB? I don't know where you are in VA but I just installed a system for the president of the local chapter of the BBB here in Richmond. He's a great guy and can help you out if...
  17. Who manufactured the equipment? I'd have to...

    Who manufactured the equipment?

    I'd have to agree with smokin68--sounds like problem is still there. I've seen a few units that trip because of a loose wire at the breaker.
  18. #10 blower relay on Goodman AHU. Went through...

    #10 blower relay on Goodman AHU. Went through the last five on my truck Friday.
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    Went to estimate a job this evening and found a...

    Went to estimate a job this evening and found a real antique. It's a Carrier Model number 38CC002300 cond unit and a 38F2-108 evaporator. These things were really neat, still running! Had, TXV's...
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    I can hardly wait for heating season to begin!

    I can hardly wait for heating season to begin!
  21. Thread: Coil Freezing

    by sean88
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    908

    22 F delta T 650 CFM... Replaced relay and...

    22 F delta T 650 CFM...

    Replaced relay and cap cycled the thing 10 times. With homeowner standing right there.
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    There's a simple method for calculating latent...

    There's a simple method for calculating latent cooling as well but it escapes me at the moment (there's no humidity our here).

    Irascible it's Total BTU=4.45 x cfm x (delta h enthalpy)
    ...
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    Check GE's website out. Varible speed motors are...

    Check GE's website out. Varible speed motors are ECM's electronically communicated motors. Here's the link, http://www.geindustrial.com/cwc/products?pnlid=4&famid=23&catid=118&id=ecm&lang=en_US
    ...
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    I've got a Lennox AHU I'm trying to figure out...

    I've got a Lennox AHU I'm trying to figure out the capacity of. It's CBH19-41-1P looks like a 3.5 ton with 10 KW strip.

    Any help would be appreciated.

    Thanks
  25. Thread: Coil Freezing

    by sean88
    Replies
    5
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    908

    I checked compressor amps they were ok. Didn't...

    I checked compressor amps they were ok. Didn't check blower amps. I'm going back out there this afternoon.
  26. Thread: Coil Freezing

    by sean88
    Replies
    5
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    908

    I've been working on Janitrol 1.5 ton heat pump...

    I've been working on Janitrol 1.5 ton heat pump with a piston metering device. The initial call was a no cooling/frozen coil. I squeezed them in inbetween calls since I was in the neighborhood. I...
  27. Thread: unloader

    by sean88
    Replies
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    1,503

    It depends on what your lowest load is. We've...

    It depends on what your lowest load is. We've struggled with this issue for the past year or so.

    Basically what I've come up with is calculating the lowest load the AHU will see during the...
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    Give the guy a break. It's a short between R and...

    Give the guy a break. It's a short between R and G.

    Disconnect R and G from unit and ohm out until you find short.
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    auto cad 2005

    auto cad 2005
  30. Replies
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    1,108

    Trane 700 is a good program for that type of...

    Trane 700 is a good program for that type of application. It's very flexible. It does take time to input all the data and you have to be careful when inputing the data. It can be a pain to find a...
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    Perhaps you should look at why are they opening...

    Perhaps you should look at why are they opening the windows in the first place.

    Does it feel stuffy inside? Are the units bringing in the code required amount of outside air?

    How are your...
  32. Thread: Return ducting

    by sean88
    Replies
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    832

    Your return duct could be 20x20 (900 FPM). Which...

    Your return duct could be 20x20 (900 FPM). Which will accomodate a 30x18. However, the return openings depending on how many you have should be sized for less than 500 FPM.

    A better description...
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    How can you condem a compressor based on one...

    How can you condem a compressor based on one pressure reading? If the compressor where not functioning both hi and low sides would be the same.

    Did you ohm out the compressor leads? A high...
  34. Replies
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    thanks karst. I've got 8 more of these units to...

    thanks karst. I've got 8 more of these units to do on Monday. I'm so excited to go up into that attic!
  35. Replies
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    Don't you also need to know where the OP lives,...

    Don't you also need to know where the OP lives, what design temperatures he desires, and the orientation of the various windows and doors? How about the number of fireplaces and the number of people...
  36. Replies
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    Does anyone know about Rudd A/C's with piston...

    Does anyone know about Rudd A/C's with piston metering devices.

    I'm doing a PM on a 4 ton Rudd A/C 10 SEER, all I could get off the name plate was 048.

    I checked the charge and got 225 psi...
  37. Replies
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    Roboteq-I see what your saying about a...

    Roboteq-I see what your saying about a restriction in the liquid line but wouldn't the head pressure be A LOT lower and the suction pressure lower too?

    I'm thinking like when you pump down a...
  38. Replies
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    If you have a sketch in pdf format with...

    If you have a sketch in pdf format with dimensions of walls and windows. I can run a load for you in 20 min.

    I also need to know what the walls are made of brick, insulation, gypboard, is there...
  39. Replies
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    Yes it would if you had a 3 ft plenum dropping...

    Yes it would if you had a 3 ft plenum dropping the ceiling height from 11 ft to 8 ft. All wall mesurements should be floor to floor with the plenum taken into consideration.

    It would not if you...
  40. Replies
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    1,717

    The difference may be in "block load" and "sum of...

    The difference may be in "block load" and "sum of peaks load". I'm not familiar with manual J, I use the Trane 700 load program.

    The block load is just that-the length and height of the walls are...
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    Goodman is builder grade at best. I said one out...

    Goodman is builder grade at best. I said one out of five I've installed I get a call back on.

    Varible speed is only for the fan motor it provides a variable volume of air flow. The compressor is...
  42. Replies
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    1,760

    Tech support for Goodman?! The stat is a...

    Tech support for Goodman?!

    The stat is a good ol' mecury stat. Nothing fancy. I didn't notice any black switches on the back of the stat when I installed it. It's a Goodman stat. Where...
  43. Replies
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    1,760

    There is something rotten in Goodman. Any...

    There is something rotten in Goodman.

    Any ideas on where to start looking?
  44. Replies
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    Lil Cat, I live in Richmond, VA. In response to...

    Lil Cat, I live in Richmond, VA. In response to your questiong about staging - it's nice and is the correct way to go to allow for maximum control, but it's not necessary. As other folks have said...
  45. Replies
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    Went on a no cooling call last night for a system...

    Went on a no cooling call last night for a system I installed this spring 1.5 heat pump. The owners says there is no air blowing from the indoor unit. I ask if the outdoor unit is running she says...
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    For type 2 appliances using HCFC-22 Before Nov...

    For type 2 appliances using HCFC-22

    Before Nov 15 1993 4" hg
    After Nov 15 1993 10" hg
    for systems containing 200 lbs

    High pressure appliances or isolated components nomally containing more...
  47. Replies
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    Here's a little chart we used in our engineering...

    Here's a little chart we used in our engineering firm

    5" 0 - 100 CFM
    6" 101 - 150 CFM
    8" 151 - 300 CFM
    10" 301 - 400 CFM
    12" 401 - 600 CFM
    14" 601 - 800 CFM
    16" 801 - 1200 CFM
    18" 1201 -...
  48. Replies
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    Wash it and hit it with some hair spray. The...

    Wash it and hit it with some hair spray. The hair will act as a tactant, i.e., it will grab dust/dirt as it goes by.

    An old air balancer told me that trick.
  49. Replies
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    I pulled all the wires from the capacitor. And...

    I pulled all the wires from the capacitor. And checked run, start and common to compressor case. Checked cap, it was good it had been replaced last year along with a hard start kit. I
  50. Replies
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    Went back to job yesterday evening, turned on...

    Went back to job yesterday evening, turned on unit started up fine.

    Cycled the unit-the unit started no problems.

    Checked start amps - they were within specs.

    SO I waited, waited, waited,...
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