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  1. #1
    Join Date
    Feb 2012
    Location
    VA
    Posts
    109

    self charge control board

    I went to class on communicating heat pumps from trane and they try to sell me a self charge tool to plug in to the control board for 100.00 and i so I made my own myself with a solenoid valve and two spade,s and two taps same thing they are selling in a fancy black box,,

  2. #2
    Join Date
    Jan 2012
    Location
    PAC-NOR
    Posts
    46
    The infamous "Charge assist" crap. Pump to the ID, recover, weld in a REAL suction port, and charge by SH/SC. They made the ChargeAssist to be a hookup, run, unhook. Amb temps have to be... above 70 If I recall correctly, and we've sent back all CA boards. I'd suggest NOT posting any diags

  3. #3
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,902
    just hook up your guages to the suction port push the button and and add refrigerant untill the led changes to charged then turn off the guage i always monitor the superheat and subcooling also ,as for the charge assist the boss *****ed to the tm untill he gave us 2 of them at no charge

  4. #4
    Join Date
    Feb 2012
    Location
    VA
    Posts
    109
    Quote Originally Posted by catmanacman View Post
    just hook up your guages to the suction port push the button and and add refrigerant untill the led changes to charged then turn off the guage i always monitor the superheat and subcooling also ,as for the charge assist the boss *****ed to the tm untill he gave us 2 of them at no charge
    Yes you can do that . If your not paying attion you can over shoot it . But any way I like hooking it up and go and do other things and that saves me time.

  5. #5
    Join Date
    Feb 2012
    Location
    VA
    Posts
    109
    Quote Originally Posted by LsT-Heating View Post
    The infamous "Charge assist" crap. Pump to the ID, recover, weld in a REAL suction port, and charge by SH/SC. They made the ChargeAssist to be a hookup, run, unhook. Amb temps have to be... above 70 If I recall correctly, and we've sent back all CA boards. I'd suggest NOT posting any diags

    Yes if its AC. I believe heat pumps can be cbarged in heat . I will get the ansewr soon I have not worked on alot of theese systems yet. I went to class I think they said any temp ill chech

  6. #6
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,902
    Quote Originally Posted by pressordrop1 View Post
    Yes you can do that . If your not paying attion you can over shoot it . But any way I like hooking it up and go and do other things and that saves me time.
    you should still monitor the charge with your thermometer to verify the thermistors and eev are working properly

  7. #7
    Join Date
    Feb 2012
    Location
    Virginia
    Posts
    34
    I've done several of these, and you cannot charge in heat with the charge assist. Only in AC mode with ODA above 70 degrees.

  8. #8
    Join Date
    Feb 2012
    Location
    VA
    Posts
    109
    Quote Originally Posted by JPJ13 View Post
    I've done several of these, and you cannot charge in heat with the charge assist. Only in AC mode with ODA above 70 degrees.
    Thanks i forgot about that, then the self charge is not all that great, most of the trouble we run into is low ambi charging, its a shame they don't come up with some thing that works below 70 F , the tool they are selling is just a solenoid valve .

  9. #9
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,483
    on the XL20i you can use charge assist if ID temp is in the 70* range and outdoor temp is 55* and above.

  10. #10
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,483
    also these charge assist boards have pretty accurate transducers and thermistors. they are most likely way more accurate then your normal gauges.

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