SERVICING
39
Checking Compressor
WARNING
Hermetic compressor electrical terminal
venting can be dangerous. When insulating
material which supports a hermetic compressor
or electrical terminal suddenly disintegrates
due to physical abuse or as a result of an
electrical short between the terminal and
the compressor housing, the terminal may be
expelled, venting the vapor and liquid contents
of the compressor housing and system.
If the compressor terminal PROTECTIVE COVER and
gasket (if required) are not properly in place and secured,
there is a remote possibility if a terminal vents, that the
vaporous and liquid discharge can be ignited, spouting
flames several feet, causing potentially severe or fatal
injury to anyone in its path.
This discharge can be ignited external to the compressor
if the terminal cover is not properly in place and if the
discharge impinges on a sufficient heat source.
Ignition of the discharge can also occur at the venting
terminal or inside the compressor, if there is sufficient
contaminant air present in the system and an electrical arc
occurs as the terminal vents.
Ignition cannot occur at the venting terminal without the
presence of contaminant air, and cannot occur externally
from the venting terminal without the presence of an
external ignition source.
Therefore, proper evacuation of a hermetic system is
essential at the time of manufacture and during servicing.
To reduce the possibility of external ignition, all open
flame, electrical power, and other heat sources should be
extinguished or turned off prior to servicing a system.
If the following test indicates shorted, grounded or open
windings, see procedures for the next steps to be taken.
Resistance Test
Each compressor is equipped with an internal overload.
The line break internal overload senses both motor
amperage and winding temperature. High motor
temperature or amperage heats the disc causing it to open,
breaking the common circuit within the compressor on
single phase units.
Heat generated within the compressor shell, usually due to
recycling of the motor, high amperage or insufficient gas to
cool the motor, is slow to dissipate. Allow at least three to
four hours for it to cool and reset, then retest.
Fuse, circuit breaker, ground fault protective device, etc.
has not tripped.
WARNING
High Voltage!
Disconnect all power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
1. Remove the leads from the compressor terminals.
WARNING
See warnings before removing compressor
terminal cover.
2. Using an ohmmeter, test continuity between terminals
S-R, C-R, and C-S, on single phase units.
Testing Compressor Windings
If either winding does not test continuous, replace the
compressor.
NOTE: If an open compressor is indicated, allow
ample time for the internal overload to reset before
replacing compressor.
Summary of Contents for ASXC16
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