Manitowoc indigo series Technician's Handbook page 195

PTCR
The PTCR allows current to flow through the start winding
at compressor startup. Current flow heats the ceramic
discs in the PTCR. The electrical resistance increases with
temperature and stops all except a trickle of current
flow through the start winding. The small flow of current
keeps the PTCR hot (260°F/127°C) and the start winding
out of the circuit.
The PTCR must be cooled before attempting to start the
compressor, otherwise the PTCR will heat up too quickly
and stop current flow through the start winding before
the compressor motor reaches full speed.
Disconnect electrical power to the entire ice machine
at the building electrical disconnect box before
proceeding.
NOTE: If a PTCR is dropped internal damage can occur
to the ceramic PTCR discs. The ceramic disc can chip and
cause arcing which leads to PTCR failure. Since there is
no way to open the PTCR in order to determine if the
ceramic disc is chipped or not, it must be discarded when
dropped.
Part Number STH025 11/16
Warning
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