HVACR Diag.
HVACR Diag.
Starbolin you are logical in looking at the single phase loads on board and noting where they are landed, but something is amiss here.
The Applied voltage should be the same as you have stated.
Does the fuse blow before any control loads are engaged?
When I have fuses blowing I generally sweep for ground faults right away.
Is the charge tainted?
Is everything really fine after the phase swap? By that I mean is everything on board running and working correctly.
That would mean:
The CCH is drawing normal current with the compressor OFF
The Running current of the compressor and ODF motors are correct with the system RUNNING
The System Gauge Pressures are correct
The measured voltages on the line are correct
The unit has not been miswired by past service procedures
By the diagram this is a split condensing unit and I have to assume that the problem was not always there, so something has changed that is not apparent or necessarily logical.
I have witnessed a number of electrical faults on HVAC eqipment that are not constant, but intermittent....but they are less common.
The problem description sounds very BINARY. Wierd.
Something is being missed. But not every diagnosis is straightforward and or fun. Some will no doubt run you around the bend depending on what day it is.....
On mechanical rotation.
Reciprocating compressors don't care which way they run. However, its better to leave them running the direction that they have been running.
Scrolls have to turn the right direction.
all the best