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PROTECTOR
®
SERIES GAS FRYERS
TABLE OF CONTENTS
CAUTIONARY STATEMENTS........................................................................................................ i
CHAPTER 1: Service Procedures
1.1 Functional Description ......................................................................................................1-1
1.2 The Electronic Ignition System......................................................................................... 1-1
1.3 Interface Board.................................................................................................................. 1-2
1.4 Thermostats ....................................................................................................................... 1-4
1.5 Accessing Fryers for Servicing ......................................................................................... 1-4
1.6 Cleaning the Gas Valve Vent Tube................................................................................... 1-5
1.7 Checking the Burner Manifold Gas Pressure.................................................................... 1-5
1.8 Measuring Flame Current.................................................................................................. 1-7
1.9 Replacing Fryer Components............................................................................................ 1-7
1.9.1 Replacing the Controller or the Controller Wiring Harness............................... 1-7
1.9.2 Replacing the Temperature Probe or High-Limit Thermostat ........................... 1-8
1.9.3 Replacing the Interface Board............................................................................ 1-8
1.9.4 Replacing an Ignition Module............................................................................ 1-9
1.9.5 Replacing an Ignitor Assembly.......................................................................... 1-9
1.9.6 Replacing or Cleaning a Combustion Air Blower............................................ 1-10
1.9.7 Adjusting the Air/Gas Mixture.........................................................................1-11
1.9.8 Replacing a Gas Valve ..................................................................................... 1-12
1.9.9 Replacing a Burner Assembly.......................................................................... 1-13
1.9.10 Replacing the Filter Motor, Filter Pump, or Filter Pump Solenoid Valve .......1-14
1.9.11 Replacing the Frypot ........................................................................................ 1-14
1.9.12 Replacing Frypot Insulation and/or Upper Burner Rails.................................. 1-16
1.10 Troubleshooting and Problem Isolation .......................................................................... 1-19
1.10.1 Ignition Failure................................................................................................. 1-19
1.10.2 Improper Burner Function................................................................................1-20
1.10.3 Improper Temperature Control ........................................................................ 1-21
1.10.4 Computer Malfunctions.................................................................................... 1-22
1.10.5 Filtration Malfunctions.....................................................................................1-22
1.10.6 Leakage ............................................................................................................ 1-24
1.10.7 Basket Lift Malfunctions..................................................................................1-24
1.11 Troubleshooting Guides .................................................................................................. 1-26
1.11.1 Troubleshooting the 24 VAC Circuit ...............................................................1-26
1.11.2 Troubleshooting the Gas Valve........................................................................ 1-28
1.11.3 Troubleshooting the Temperature Probe.......................................................... 1-28
1.12
Probe Resistance Chart.................................................................................................... 1-29
1.13 ATO (Automatic Top-Off) Service Procedures.............................................................. 1-29
1.13.1 ATO (Automatic Top-Off Troubleshooting.....................................................1-30
1.13.2 ATO (Automatic Top-Off) Board Positions and Harnesses ............................ 1-31
1.13.3 Replacing the ATO Board or Transformer....................................................... 1-32
1.13.4 Replacing the ATO Pump or Solenoid............................................................. 1-32
1.14 CM7 Computer Service Procedures................................................................................1-32
1.14.1 CM7 Computer Troubleshooting ..................................................................... 1-32
1.14.2 CM7 Useful Codes and Passwords .................................................................. 1-35
1.14.3 CM7 Menu Summary Tree............................................................................... 1-36
1.14.4 CM7 Board Pin Positions and Harnesses......................................................... 1-37