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Thread: Larkin condensors
01-02-2013, 08:29 PM #14
Charge was calculated by size of receiver height and diameter. and mounting direction ( vertical or horizontal) We all have books and literature from united refrigeration and refrigeration research. That will give you the capacity of it. That is how our company and a few of the 20 plus year guys have always said to do it.
At my previous company I was always told to charge to a til glass.
I have been hesitant lately of over charging I had one case over the summer that I over charged by about 6lbs and got a call back on the WIF not holding temp. But that was charging til a clear glass and it bit me.
So now Ive been trying to use as literature as possible when charging. I also do agree with you guys that once ok but multiple times odds are that it is more than likely not a equipment issue. But everything was installed and charged to the letter so that is the part that makes it odd. and when a new headmaster is installed everything acts properly.
01-02-2013, 08:30 PM #15
And I believe Lennox owns HeatcraftLocal 597 Service Fitter
Metal Trade Journeyman
PAY ME NOW OR PAY ME LATER
It was working when I left...
01-02-2013, 08:34 PM #16
been in the trade over 30 years...... work on lots of refrigeration..... maybe changed 3 headmasters in my life...... they usually don't cause a problem......it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair
01-02-2013, 08:37 PM #17Regular Guest
- Join Date
- Feb 2012
Yes, Lennox owns Heatcraft. One brand that wasn't mentioned was Kysor/Warren, also under Heatcraft. Rumor has it that Lennox will roll out a Heatcraft Service soon, specializing in anything Com. Ref. What do you guys think? Was not the Service Experts and National Accounts Services businesses enough?!
01-02-2013, 09:29 PM #18
The only written info I ever seen on low ambient charge requirements for Heatcraft units with the HyperCore condenser coils is this FAQ bulletin (See p.6):
Heatcraft 1/2 - 6 HP Units with Hypercore FAQ
As you can see from this, 2-3 pounds is about it for even their larger units.
01-02-2013, 09:37 PM #19
01-02-2013, 09:42 PM #20
01-03-2013, 11:51 AM #21
01-03-2013, 05:54 PM #22Regular Guest
- Join Date
- Oct 2008
- Cleveland, Ohio
Weigh in charge until glass is full. Take that weight and figure out what 10% of that is and weigh that in. Heatcraft tech support told me that 12 years ago and I have done it ever since with out fail.
01-04-2013, 07:46 AM #23Regular Guest
- Join Date
- Jan 2005
01-04-2013, 10:05 AM #24
Re: Charging Heatcraft Condensing Units
Heatcraft's I & O manuals for their condensing units leave a lot to be desired regarding how to properly charge a system. In addition, their units' data tags don't indicate anything about either receiver capacity or winter charge requirement with a condenser flooding control like some other manufacturers do.
Just as I had to do some digging to find that PDF on the HyperCore flooding charge info, it took a bit of searching all of their published literature to find any mention of winter charging methods.
Here's a little ditty from a FAQ page which actually discusses it...in part (Scroll down to near the bottom under "Disadvantages":
FAQs - Flooded Condenser Using Headmaster
It states that after the sightglass is cleared add 15% of the initial weighed-in charge for operation down to 0ºF or an additional 30% for -20ºF.
Bear in mind that these guidelines were written before the advent of the microchannel designs and their vastly reduced coil volumes.
A more correct method for HyperCore units would be to clear the SG (while maintaining a condensing temperature above 105ºF by blocking airflow as necessary) and add the 2-3 lbs flooding charge as indicated in my previous link.
01-04-2013, 05:55 PM #25
What's all this talk about 90% receiver capacity?
I'll never charge a receiver to 90%.
01-04-2013, 07:42 PM #26