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  1. #27
    Join Date
    May 2011
    Location
    Western, KY
    Posts
    3,118
    Quote Originally Posted by bmac View Post
    4 x 4 box with a toggle switch and a rotary speed control switch, like for a ceiling fan. Two wires with spade connectors to hook in series with the condenser fan motor. Adjust the dial to get the head pressure where you want it.
    So it's the power thief version of the ICM head pressure controls : ). Just don't dial down a sleeve bearing motor too far or it's bye bye.

    I still have a question, this will work on a txv system as you get the head pressure up to a "normal range" and assuming a decent load on the evap coil can confirm subcool and check that the txv is delivering superheat bbuuutttt.... It still doesn't work on fixed orifice if you want to do it right : / and that's still a lot of units. You need an actual measured outdoor temp with your indoor WB, unless I'm missing some crazy awesome superheat chart based off forced head pressure, very possible.

  2. #28
    Join Date
    Jun 2006
    Location
    Michigan
    Posts
    962
    We're not charging the units, just making sure they're in the ball park, on a maintenance check. We try to simulate the pressure of a 95 degree day. Old units might be 125 sat. temp, newer will be lower, depending on efficiency. Again, if something doesn't look right or charge needs adjusted, we put on a list to return when warmer.

    If we didn't do it this way, we couldn't get them all done in our relatively short summers.

  3. #29
    Join Date
    May 2011
    Location
    Western, KY
    Posts
    3,118
    Quote Originally Posted by bmac View Post
    We're not charging the units, just making sure they're in the ball park, on a maintenance check. We try to simulate the pressure of a 95 degree day. Old units might be 125 sat. temp, newer will be lower, depending on efficiency. Again, if something doesn't look right or charge needs adjusted, we put on a list to return when warmer.

    If we didn't do it this way, we couldn't get them all done in our relatively short summers.
    That makes sense.

  4. #30
    Join Date
    May 2009
    Location
    In the Hudson Valley of New York
    Posts
    1,872
    15 Degrees out this morning, I do not see March PMs happening here?

  5. #31
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    Quote Originally Posted by doc havoc View Post
    Set up a tent. Run the condenser in the tent until the ambient air (in the tent) is at the desired temperature. Then, perform your checks. It adds a bit of set up time, but will more accurately simulate a 90 degree day.
    I like this one. Leave it to someone in MN, to come up with a better solution. Probably since a 85F day only happens for about 6-8 weeks in late afternoon from July and August up there.

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