MovinCool CM12 Service Manual - Manual (Page 44)

Repair Section
44
7.6 Inspection of Compressor
(1) Compressor motor
• Measure resistance across the terminals of the
compressor motor.
• Between terminals (at 77 °F (25 °C))
- R-C Approx. 0.49 - 0.8 ohm
- C-S Approx. 1.9 - 3.3 ohm
• If the measured resistance is not equal to the
standard values listed above, replace the
compressor. The compressor has an external overload relay. The overload relay should be
operational if the above resistance is obtained under normal temperature. For overload relay
specifications, see chart on page 27.
(2) Overload relay
• Check for continuity across two terminals of the
overload relay. At normal temperature, there
should be continuity across the terminals.
• If there is no continuity across the terminals,
replace the overload relay.
Operating Temperature
OFF (open contacts) ON (closed contacts)
302 °F (150 °C) 142 °F (61 °C)
I002770
C
R S
I001701