Dial a Charge question

[intellitech]

Gentlemen,

Here's my question, where can I find a conversion chart for a Thermal Engineering Dial a Charge model# 7005? The ones we use at our shop/service vans are applicable with R-12, 22 and 502. I know that the conversion factor for 404a (using the R-22 scale) is 1.14 and 134a is .99. But what about all the other refrigerants out there? I cannot seem to find this information....just want to know how to use the Dial a Charge with other gases such as: MP-39, Hot Shot, etc.

Thanks!

[wannafreeze]

I don't know the answer but I should say that I am surprised that someout out there is interested in dial a charge.A few years back I was asking questions about it here.I obtained one.It stayed in my truck doing nothing ,finally I got rid of it.The electronic scale makes it obsolite and time consuming to use it.But sometimes I still miss it,I used it at one of the companies I worked for in the very beginning.
Here I found that thread from 2006:
http://www.hvac-talk.com/vbb/showthread.php?t=97726

[r404a]

Not to make a fuss...but I thought that these went the way of mercury manometers...ILLEGAL to use.

not agreeing or disagreeing...just stating...


r404a

[intellitech]

r404a,

The Dial a Charge I am referring to is made by Thermal Engineering and is one of several still produced.....not sure what you meant by illegal.

These are great for charging small reach in units...which my shop works on quite extensively since we are in the light commercial refrigeration market.

They are so much easier to get a correct (for example) 9 oz. charge that a Delfield prep table requires and True which uses a coil mounted temp control and of course get the wrong charge and the unit won't get the correct temperature operating range.....

[r404a]

Sir,
I very possibly could be wrong on that. I thought epa wanted these things gone due to the glass breaking aloowing venting. i loved the small ones I could put r12 in and it had a plug for a heater.


r404a