View Full Version : Charge R134 without a scale
Acrisoft
09-11-2011, 01:24 PM
Hi
I know that a scale can delivery a precise refrigerant charge.
However many of my students cannot afford for a scale.
I would like to improve a technique that I learnt years ago still in R12 times.
How can I charge R134 in a domestic fridge without a scale using only the manometer as a reference ?
Could anybody describe it step by step right after the vacuum step ?
Moises
AlexG
09-11-2011, 05:38 PM
Acrisoft, If u can mesure subcooling 5...8K I suppose it is correct. Sorry, I'm not domestic frige specialist...
charlie patt
09-11-2011, 08:39 PM
easier ways i find is sweating of suction pipe with a clampmeter testing comp run amps but on a domestic you could charge on a standing pressure or and dont laugh during my junior years mothers bathroom scales they lasted bloody years but not so good on a small difference my lastest set of scales is 1 gram acuracy i think the bathroom scales depended on time of day and no battery to change
install monkey
09-11-2011, 09:32 PM
use 1kg bottles and baking scales- rated for 2kg,small,cheap,and light too.
tonto33
09-11-2011, 10:06 PM
Get Scales from here >>> http://www.vulkan-lokring.de/fileadmin/lokring/Kataloge/Hausgeraete_und_Kleinkaelte_Bereich/VULKAN_LOKRING_l_Refrigeration_appliances__en_.pdf
nike123
10-11-2011, 07:02 AM
......................
nike123
10-11-2011, 07:26 AM
Hi
I would like to improve a technique that I learnt years ago still in R12 times.
How can I charge R134 in a domestic fridge without a scale using only the manometer as a reference ?
Could anybody describe it step by step right after the vacuum step ?
Moises
That is wrong technique and you cannot improve it.
You cannot correctly charge with manometers only. You need thermometers.
According to Danfoss service literature, you should charge to 4-7K of evaporator superheat.
http://i42.tinypic.com/34hvsph.jpg
nike123
10-11-2011, 07:36 AM
Acrisoft, If u can mesure subcooling 5...8K I suppose it is correct. Sorry, I'm not domestic frige specialist...
Charging to subcooling is only with TXV systems. Domestics are 99% cappilary tube and charging is done by superheat or by weight.
spimps
10-11-2011, 07:40 AM
Can you afford recovery machines,do you have them ?
Powered by vBulletin® Version 4.2.1 Copyright © 2024 vBulletin Solutions, Inc. All rights reserved.