S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice
S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice
S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice
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Section 6 Electrical System<br />
There are other problems that may cause compressor<br />
start-up failure with a good PTCR in a new, properly<br />
wired ice machine.<br />
• The voltage at the compressor during start-up is too<br />
low.<br />
<strong>Manitowoc</strong> ice machines are rated at ±10% of<br />
nameplate voltage at compressor start-up. (Ex: An<br />
ice machine rated at 208-230 should have a<br />
compressor start-up voltage between 187 and 253<br />
volts.)<br />
• The compressor discharge and suction pressures<br />
are not matched closely enough or equalized.<br />
These two pressures must be somewhat equalized<br />
before attempting to start the compressor. The<br />
harvest valve (and HPR valve on remotes) energizes<br />
for 45 seconds before the compressor starts, and<br />
remains on 5 seconds after the compressor starts.<br />
Make sure this is occurring and the harvest valve<br />
(and HPR solenoid) coil is functional before<br />
assuming that the PTCR is bad.<br />
CHECKING THE PTCR<br />
! Warning<br />
Disconnect electrical power to the entire ice<br />
machine at the building electrical disconnect box<br />
before proceeding.<br />
1. Visually inspect the PTCR. Check for signs of<br />
physical damage.<br />
NOTE: The PTCR case temperature may reach 210°F<br />
(100°C) while the compressor is running. This is normal.<br />
Do not change a PTCR just because it is hot.<br />
2. Wait at least 10 minutes for the PTCR to cool to<br />
room temperature.<br />
3. Remove the PTCR from the ice machine.<br />
4. Measure the resistance of the PTCR as shown<br />
below. If the resistance falls outside of the<br />
acceptable range, replace it.<br />
<strong>Model</strong><br />
<strong>Manitowoc</strong><br />
Part Number<br />
Cera-Mite<br />
Part Number<br />
<strong>Manitowoc</strong> PTCR 8504913<br />
Room<br />
Temperature<br />
Resistance<br />
<strong>S1800</strong>M 8504913 305C9 8-22 Ohms<br />
SV1541<br />
Part Number 80-1634-3 6-17