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Thread: No Access To Determine Txv Or Md
07-27-2008, 01:04 AM #27Professional Member
- Join Date
- Feb 2007
I always check the equalization time of system pressure. which works in most cases.
07-27-2008, 07:36 AM #28
Skippedover was just kidding when he said to take a rest on top of the condenser. He knows axial Propeller fans can overload the blower motor when the discharge air is blocked. Just use something lightweight that the intake-side will hold against the condenser fins guards.
Squirrel cage wheels with forward curved blades on residential systems unload when discharge air is blocked off too much & will overload when there is no static pressure. There is a preferable ESP range for each AH blower design, that ought to be listed on the blower; they vary at the point of serious unloading. If you amp-probe check enough of those blower motors, if the amp draw is too low according to its rating, you can begin to tell that the ESP is too high.
I lot of us (bad boys) used to set a nearly empty R-22 cylinder on top of a condenser to warm it a little. Back then fan motors had more HP & higher amp draws, therefore it didn't seem to cause any harm, just more noise.
Back in the 1960's & 1970's there were a far number of TXV metering devices & some table top condensers' that had the fan underneath blowing up through the coils. Well, where there were cottonwood trees or a lot of leaves or other debris under the unit, the fan motors would overload & burnout.
I don't understand the engineering genius of that moronic design.
However, on hot days & a heat-loaded E-Coil, You could move your wrist over the condenser from outlet up to inlet, & tell if the liquid was taking up too much area of the coils; an overcharged system. - udarrell
Last edited by udarrell; 07-27-2008 at 07:41 AM. Reason: Had a line in wrong order
07-27-2008, 09:27 PM #29
he was kidding about resting on it, i was ready to bring my pillow and set my alarm clock, if customer came out was going to say its the new way of checking charge , well guess that wont work hmmmm