Service Manual

Part Number: 000015430 Rev 02 5/20 169
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.
n
Warning
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.