Manitowoc Ice S1800 Checking the Ptcr, Manitowoc Ptcr, Model Manitowoc Cera-Mite Room

Section 6 Electrical System

There are other problems that may cause compressor start-up failure with a good PTCR in a new, properly wired ice machine.

•The voltage at the compressor during start-up is too low.

Manitowoc ice machines are rated at ±10% of nameplate voltage at compressor start-up. (Ex: An ice machine rated at 208-230 should have a compressor start-up voltage between 187 and 253 volts.)

•The compressor discharge and suction pressures are not matched closely enough or equalized.

These two pressures must be somewhat equalized before attempting to start the compressor. The harvest valve (and HPR valve on remotes) energizes for 45 seconds before the compressor starts, and remains on 5 seconds after the compressor starts. Make sure this is occurring and the harvest valve (and HPR solenoid) coil is functional before assuming that the PTCR is bad.

CHECKING THE PTCR

!Warning

Disconnect electrical power to the entire ice machine at the building electrical disconnect box before proceeding.

1.Visually inspect the PTCR. Check for signs of physical damage.

NOTE: The PTCR case temperature may reach 210°F (100°C) while the compressor is running. This is normal. Do not change a PTCR just because it is hot.

2.Wait at least 10 minutes for the PTCR to cool to room temperature.

3.Remove the PTCR from the ice machine.

4.Measure the resistance of the PTCR as shown below. If the resistance falls outside of the acceptable range, replace it.

Model	Manitowoc	Cera-Mite	Room
			Temperature
	Part Number	Part Number
			Resistance
S1800M	8504913	305C9	8-22 Ohms

SV1541

Manitowoc PTCR 8504913

Part Number 80-1634-3 6-17