Question about Robinair Cool Tech 34700Z Recovery, Recycling, Recharging

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My 34700z will tell me i have 2 or 3 lbs of freon but when i try to charge even 1/2 it will say insuffecent. how do i reset the machine to get a true reading? thanks

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Your machine sound like normal to me! For charging to the vehical you should have minimum 3.30 lbs of refrigerant on ISV tank. However if you wish to re-calibrate the scal,please check with my other solution where i post detail information about scale calibration.
I wish this will help you to solve the problem.

Posted on Aug 26, 2010

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2 Answers

With a typical line set, how much R-22 should a ckl30-1 2.5 ton a/c need?


the refrigeranterant charge is stamped on the unit data plate in ounces of freon. take this number and multiply it by 16 and get the pounds and the decimal point will need to be converted back to ounces. example 138 ounces equals 8.625 lbs of freon which is about 8 lbs and 8 0r 9 ounces. this is for a 15 foot lineset. measure your lineset and substract 15 , then take this number and add .6 per foot. .6 ounces of freon per foot of refrigerant line over 15 feet. you will have to use a quality digital scale to weigh in this total charge

May 23, 2014 | Goodman CKL30AR30 Air Conditioner

1 Answer

34700z only charges about .5 lbs to 1.0lbs, asks to start engine to help draw freon in. still won't charge any more. where should i start


The machine requires a min amout of 6lbs to even charge. but if you are showing any amout charging it is not the machine its self. you are looking at may be bad hoses or couplers. it is common in the winter months to have charge issues if the unit is not above 70 degrees F. dont forget there are cars/trucks out there that no matter how hard you try you can not complete a charge on the high side and you must switch over to a low side charge

Aug 06, 2012 | Robinair Cool Tech 34700Z Recovery,...

2 Answers

Hi, my robinair ac375 wonot charge gas, gauge up arrow and down arrow wont move, we done filter and vaccum oil and reset. it is possible to get special way to reset gauge?


mhkamran.jpg Please check Charging solenoid (S3) in Solenoid manifold block, it may need to change solenoid coil or Rebuild. If charging solenoid is OK, then problem can be SCALE or MAIN CIRCUIT BOARD. See if the machine display show default charging weight 90 kg/lbs when you active CHARGE mode. If not then calibrate scale. But if default charging weight is shown then replace MAIN CIRCUIT BOARD. See attached picture to find solenoids. I wish this will help you to solve the problem. If so please vote for it for further assistance. Best of luck!

May 13, 2011 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

Can my Robinair 34700Z be set to recharge in ounces instead of pounds or pounds/ounces (EX. 2.4 lbs.)?


You can not use any Robinair machine in ounces to recharge refrigerant instead of LBS or KG. the software is not programed for count refrigerant in ounces!
Hope you get your answer

Dec 21, 2010 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

Over charges. machine seems to operate normal, but it over charges every time. I tried to recalibrate the scale. this didn't help.


It seems to be your last calibration was not correct!
For Robinair Model-34700z scal calibration follow as bellow:
Form the main menu go to ''CHANGE DEFAULT'' then press 5454 & YES key (passwoed to access default option).Once you enter to default menu,go to "SCALE CALIBRATION" & press YES key. now follow the on screen text.
NOTE:you should have 9KG/20LBS of weight for scale calibration. Do not change ''TANK TARE''. it must be on factory setup 16.30 lbs OR 7.40 kg.
Hope this will help you to solve thr problem & if my solution is useful to you please vote for it

Aug 15, 2010 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

Machine will not read scale or does not weigh freon . will evacuate but will not charge says tank needs fill but will not fill either


Most robinair units require the filter to be changed every so many uses. If the filter is not been changed, the unit will not work.

Aug 14, 2010 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

34700z will operate properly till it starts charging and it shoots freon into the oil recovery tank when charging. any help would be appiciated


Please check 1# OIL DRAIN solenoid, 2# OIL DRAIN switch, 3# OIL DRAIN CHECK valve. It sound like one of those are faulty.
Hope this will help you to solve your problem, if so please vot for my solution. Good luck!

Jul 30, 2010 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

How much freon does a 2001 gmc sierra take in lbs.


1.6 lb for front AC only & 2.5 lb for dual AC( front & rear)

Jul 06, 2009 | Robinair Cool Tech 34700Z Recovery,...

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