Friedrich FRESHAIRE PVH09K3FA, Руководство по обслуживанию и запасным частям, Страница: 77 / 109

77 PB
COMPONENT TESTING
Compressor Checks
Overloads
The compressor is equipped with either an external or internal overload which senses both motor amperage and winding
temperature. High motor temperature or amperage heats the overload causing it to open, breaking the common circuit within
the compressor. Heat generated within the compressor shell, usually due to recycling of the motor, is slow to dissipate. It may
take anywhere from a few minutes to several hours for the overload to reset.
Checking the Overloads
External Overloads
With power off, remove the leads from compressor terminals. If the compressor is hot, allow the overload to cool before
starting check. Using an ohmmeter, test continuity across the terminals of the external overload. If you do not have continuity;
this indicates that the overload is open and must be replaced.
Internal Overloads
The overload is embedded in the motor windings to sense the winding temperature and/or current draw. The overload is
connected in series with the common motor terminal.
Should the internal temperature and/or current draw become excessive, the contacts in the overload will open, turning off the
compressor. The overload will automatically reset, but may require several hours before the heat is dissipated.
Checking the Internal Overload
1. With no power to unit, remove the leads from the compressor terminals.
2. Using an ohmmeter, test continuity between terminals
C-S and C-R. If no continuity, the compressor overload is open and the compressor must be replaced.
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation.
All electrical connections and wiring MUST be
the National Electrical Code and all local codes
which have jurisdiction.
Failure to do so can result in personal injury or
death.
BURN HAZARD
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with a torch.
Failure to follow these procedures could
result in moderate or serious injury.
WARNING