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  1. #27
    Join Date
    Sep 2008
    Location
    Western PA
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    25,961
    Quote Originally Posted by EugeneTheJeep View Post
    Been working in cold climate for 30 years, so it is not my first. The unit is charged to receiver capacity.
    That's not necessarily the correct way to charge a headmaster.

    http://www.sporlanonline.com/90-30-1.htm

  2. #28
    Join Date
    May 2009
    Location
    In the Hudson Valley of New York
    Posts
    2,049
    Quote Originally Posted by jpsmith1cm View Post
    That's not necessarily the correct way to charge a headmaster.

    http://www.sporlanonline.com/90-30-1.htm
    The system has been charged this way for 5 years, I was the last one to recharge it over the summer, when the HP capillary snapped, it dumped its entire charge, and it is charged per Trenton specs.

  3. #29
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,335
    Im interested in hearing 30 years of experience , new ways of doing things , tricks of the trade , so how do You charge your systems with head masters in the summer ?

  4. #30
    Join Date
    Aug 2012
    Location
    willowick ,oh
    Posts
    261
    defrost termination? possibly the cause of a freeze-up every now and again. does it have one? what style if so. I have had a few run-ins with these irregular nuisance calls with frozen coils. Also, when you say frozen coil, what type of frozen, if you get my drift. Block of ice, or the kind of ice you wanna make a snow cone with while it defrosts.

  5. #31
    Join Date
    May 2009
    Location
    In the Hudson Valley of New York
    Posts
    2,049
    Quote Originally Posted by Snapperhead View Post
    Im interested in hearing 30 years of experience , new ways of doing things , tricks of the trade , so how do You charge your systems with head masters in the summer ?
    I charge it till I get a full site glass, then I add about 20% extra based on receiver size. I then do a pump down to make sure I am not over charged, and it does not raise the head pressure. I learned this by installing a unit years ago that recommended this method of additional charge on the receiver, I do not recall what brand it was? I never get a winter call back.

  6. #32
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,596
    Quote Originally Posted by EugeneTheJeep View Post
    I charge it till I get a full site glass, then I add about 20% extra based on receiver size. I then do a pump down to make sure I am not over charged, and it does not raise the head pressure. I learned this by installing a unit years ago that recommended this method of additional charge on the receiver, I do not recall what brand it was? I never get a winter call back.
    I'd be interested to see the Sporlan calculation vs your method and see if you come close to what is needed from doing the math.

  7. #33
    Join Date
    May 2009
    Location
    In the Hudson Valley of New York
    Posts
    2,049
    Well guys, it froze up again, on a very cold day in the teens, driving over I thought it has to be a headmaster charge problem, now that you had me over analyzing it , now I am going to have to eat crow at HVAC Talk! So I defrosted it, as I was hosing it down, strange enough the txv started hissing with the solenoid switch off? I thought maybe the solenoid is leaking by, but that stopped and it was late, I thought maybe just a pump down as the coils were thawing? System was running fine so I put it back together as it was late and dark on the roof. Follow up in the AM.

    Customer left a message over night that the alarm company called about the dairy case temp. I arrived in the morning, 2 degrees outside, and the case was running at 20 degrees, so it was a low temp alarm. So it is starting to look like solenoid or cold control. Of course by the time I get a ladder out and get to the solenoid, every thing is back to normal. So I pulled apart the solenoid (sporlan) and I could swear the small orifice towards the edge of the disc is partially clogged. So I blew it out, it looked better. Since they had product pulled from the case, I also changed the cold control.

    Now lets get to the charge on a 2 degree day, I had about 200 PSI high side and a clear site, so no problem with headmaster or charge.

    Wish me luck guys, cause ironically I got this customer 5 or 6 years ago, when the dairy case was giving him a problem at the old store, it was a night call, and his former service company would not call him back after multiple repeat calls and call backs. It was tripping out on low oil, and I fixed it by changing out crappy old TXVs, and became his hero.

  8. #34
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,335
    I assume you have checked the evap fans

    maybe a fan blade on upside down ....

    you want the cup of the blade facing the direction of air flow

  9. #35
    Join Date
    May 2009
    Location
    In the Hudson Valley of New York
    Posts
    2,049
    Quote Originally Posted by Snapperhead View Post
    ..

    you want the cup of the blade facing the direction of air flow
    Really??????????

  10. #36
    Join Date
    Feb 2007
    Location
    Georgia
    Posts
    167
    Better to eat crow with us than the customer! They make you eat the feathers too.

    Your doing what you should staying with the problem, I bet they will understand

  11. #37
    Join Date
    Jul 2011
    Location
    Lehigh Valley, PA
    Posts
    473
    I never worked or troubleshooted an open air case but I see plenty of older coolers and the like. When I find an issue with freezing evaporator, after checking the obvious, fan motors, blades, SH, I always test the thermostat using my Fluke 52 to see that the t-stat is accurately triggering on and off. I usually end up replacing those old Ranco's with the ETC-111 or the A-419. Both are very precise.

  12. #38
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,335
    Quote Originally Posted by EugeneTheJeep View Post
    Really??????????
    dude you'd be surprised how many people i worked with didnt know which way the friggin dip goes , or why it matters

  13. #39
    Join Date
    May 2009
    Location
    In the Hudson Valley of New York
    Posts
    2,049
    Quote Originally Posted by Snapperhead View Post
    dude you'd be surprised how many people i worked with didnt know which way the friggin dip goes , or why it matters
    Same here, I saw a lot of those fans going backwards in my day. I had a tech trying to sell another customer on a defrost timer for a sandwich unit with LP operation, it had worked this way since the early 70s, turns out he had one fan blowing in, and one out. Air was going in one fan, and out the other, never going through the coil.

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