EarthLinked SCWD-024-1C, Quick Start Instructions

Page: 51 / 62

SCWD-QS (12/16) Page 51
Note: Cautiously and carefully feel the top of the compressor to see if it has overheated.
If it is hot, the internal overload may be open. You may have to wait several hours for it
to reset before proceeding.
If the compressor draws a high amperage and does not start (amperage is approximately
locked rotor amperage
– LRA (See Figure 7)), the compressor is locked mechanically
and should be removed from the system and replaced. Verify before removing!
7. Motor Circuit Testing
Using a digital volt-ohmmeter (VOM), measure the resistance across the compressor
windings terminals as shown in Figure 33. The power leads to the compressor must be
disconnected before taking an electrical measurement. A good rule of thumb for single
phase compressors is that start winding resistance (R
2
) is 3 to 5 times greater than run
winding resistance (R
1
).
Figure 33. Compressor Motor Circuit Testing