copeland compressor curve with fan cycle
how do you use curve when condenser uses a fan cycle, and head pressure varies by 50 psi? do you just use average condensing temp, or does it not really work with fan cycle?
Originally Posted by kklobas
A compressor performance curve is really a "snapshot" in time.
It works best if you can get things to a steady state, or at least take your readings from a single set of conditions.
Let's try to put it into practice because I'm not sure I'm explaining it well.
We'll install our gauges and other instruments.
If we take our pressure readings just before the condenser fan cycles on and take our electrical readings just before the fan cycles off, our "snapshot" won't be very accurate, will it?
So, we try to take all of our readings at the same conditions or as close to the same conditions as possible.
Maybe it'd be easier to disable the fan cycle control, block off the condenser and let everything stabilize then take you "snapshot"?
Originally Posted by ryan1088
I usually use a pieceof cardboard and block off to maintain condensing saturation of 95 to 115*F