Troubleshooting; Operating Problems; General Troubleshooting - Dean MF90 Series Installation & Operation Manual

MF90 SERIES PORTABLE FILTRATION SYSTEMS
CHAPTER 6: TROUBLESHOOTING

6.1 Operating Problems

Plugged lines and plugged filter paper account for over 90 percent of filtration system malfunctions.
Troubleshooting flowcharts included in this chapter, provide step-by-step instructions to assist the
operator in diagnosing common malfunctions.
A. Plugged Lines
1. To guard against plugged lines when using solid shortening, follow these guidelines:
a. At the end of the filtering cycle, let the filter bubble into the fryer through the flexible
hose for about 10-15 seconds. If it is blowing bubbles, air is moving through the lines
and the filter is less likely to be plugged.
b. When filtering is complete, disconnect the flexible line and hang it up to drain.
B. Plugged Paper
Improper use of the filter powder will cause a slow oil flow return rate. The first indication of paper
plugging is a surging, jerking movement of the hose. To correct this, review the instructions for the
correct use of filter powder, and change the filter paper more frequently. When filtering several
fryers prior to changing paper, ensure that excess sediment is scraped off the filter paper after
filtering each frypot. If plugged paper remains a problem, review the chart in section 6.2 for proper
diagnosis.

6.2 General Troubleshooting

The following chart contains information to assist the user in diagnosing the most common
malfunctions with portable filtration systems. Possible solutions and/or corrective actions are given
for each scenario.
If the malfunction cannot be diagnosed using the information in this section, contact your Factory
Authorized Service Agent for repairs.
Use extreme care when testing electrical circuits. Live circuits will be exposed.
Inspection, testing and repair of gas or electrical equipment should be performed by
DANGER
DANGER
qualified personnel.
6-1