I have a nearly-new Bryant heat pump (213BNA030-A ourdoor unit) installed at my house... works great so I'm not asking for fix-it help! I'm an engineer and I've been reading this site and just want to see if I understand what all these parts are in the outdoor unit.
Can you tell me if I have this right?
1- horizontal brass thing -- reversing valve (with orange wires leading to solenoid to actuate it)
2- pink wires -- to thermistor for determining when to defrost?
3- There seems to be 2 pressure switches -- one with blue wires (right on output of compressor) and one with yellow (right before liquid line exits unit) Why 2?
4- The pipe with the label "336530701" on it -- is that the piston metering device for when running in heat mode? (indoor coil has TXV)
5- black cylinder at bottom of pic (between reversing valve and compressor high-side I think). What is it? It looks like some sort of mini-accumulator but is much smaller than the thing I *know* is the accumulator on the top right of the pic.