Filter System; Hood Relay System; Chapter 3: Component Troubleshooting; Probe - Pitco ME14S-C/MFD Service Manual

Filter System:

Opening the RED Return Valve Handle will cause
the Pump On Relay to be energized and the pump
will begin to pump. Closing the Return Valve Handle
will de - energize the Relay and the Pump will stop
pumping.

Hood Relay System:

There is one Hood Relay (K15) per "battery" of fry-
ers, it is wired in parallel to every computer (both
sides of a split vat). When any side of any computer
is turned ON this Relay (K15) will energize and will
stay energized until all of the computers are turned
OFF.
Chapter 2: COMPONENT
TROUBLESHOOTING:

Probe:

The resistance of the probe will change as the tem-
perature changes. The resistance will decrease as the
temperature rises. The lower the temperature the
greater the resistance change will be per degree of
temperature change, as the temperature approaches
the working range of the probe, the resistance change
will become more linear.
If the probe is suspect, check its resistance and the
oil/air temperature at which it was taken. Compare
these values on the chart below.
TEMP RESISTANCE
°F Ohms
60 139055
80 84644
100 53146
120 34328
140 22755
160 15446
180 10716
200 7586
210 6427
220 5470
240 4013
260 2991
280 2262
300 1734
320 1347
325 1267
If the probe returns an open circuit or O Ohms read-
ing it should be replaced. If the resistance varies more
than 20 Ohms when being checked between 325-
375°F the probe will give a false temperature read-
ing on the computer and should be replaced. How-
ever, it will continue to operate at a slightly higher
or lower temperature. Allow the oil to cool and check
the probe resistance at a lower temperature. As can
be seen from the chart a greater degree of offset can
be allowed at a lower temperature.
5
TEMP RESISTANCE
°F Ohms
330 1192
335 1123
340 1058
345 998
350 942
355 890
360 841
365 795
370 752
375 712
380 675
385 640
390 607
395 576
400 547