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BIPH52/55-MPH52/55
SERIES GAS FRYERS
TABLE OF CONTENTS
CHAPTER 1: Service Procedures
1.1 Functional Description ......................................................................................................1-1
1.1.1 The Electronic Ignition System.......................................................................... 1-1
1.1.2 Interface Board ................................................................................................... 1-2
1.1.3 Thermostats ........................................................................................................ 1-4
1.2 Accessing Fryers for Servicing ......................................................................................... 1-4
1.3 Cleaning the Gas Valve Vent Tube................................................................................... 1-5
1.4 Checking the Burner Manifold Gas Pressure .................................................................... 1-5
1.5 Measuring Flame Current.................................................................................................. 1-7
1.6 Replacing Fryer Components............................................................................................ 1-7
1.6.1 Replacing the Controller or the Controller Wiring Harness............................... 1-7
1.6.2 Replacing the Temperature Probe or High-Limit Thermostat ........................... 1-8
1.6.3 Replacing the Interface Board............................................................................ 1-9
1.6.4 Replacing an Ignition Module.......................................................................... 1-10
1.6.5 Replacing an Ignitor Assembly ........................................................................ 1-10
1.6.6 Replacing or Cleaning a Combustion Air Blower............................................ 1-11
1.6.7 Replacing a Gas Valve ..................................................................................... 1-14
1.6.8 Replacing a Burner Assembly.......................................................................... 1-15
1.6.9 Replacing the Filter Motor, Filter Pump, or Filter Pump Solenoid Valve ....... 1-16
1.6.10 Replacing the Frypot ........................................................................................ 1-17
1.6.11 Replacing Frypot Insulation and/or Upper Burner Rails.................................. 1-19
1.7 Troubleshooting and Problem Isolation .......................................................................... 1-25
1.7.1 Ignition Failure ................................................................................................. 1-25
1.7.2 Improper Burner Function................................................................................ 1-26
1.7.3 Improper Temperature Control ........................................................................ 1-28
1.7.4 Computer Malfunctions.................................................................................... 1-28
1.7.5 Filtration Malfunctions..................................................................................... 1-29
1.7.6 Leakage ............................................................................................................ 1-30
1.8 Troubleshooting Guides .................................................................................................. 1-31
1.8.1 Troubleshooting the 24 VAC Circuit ............................................................... 1-33
1.8.2 Troubleshooting the Gas Valve........................................................................ 1-35
1.8.3 Troubleshooting the Temperature Probe.......................................................... 1-35
1.9
Probe Resistance Chart.................................................................................................... 1-36
1.10 Principal Wiring Connections ......................................................................................... 1-37
1.11 Wiring Diagrams ............................................................................................................. 1-38
1.11.1 Main.................................................................................................................. 1-38
1.11.2 Transformer / Filter Boxes ............................................................................... 1-39
1.11.2.1 MPH152/155 ................................................................................. 1-39
1.11.2.2 BIPH252/255 and 452/455 Domestic............................................ 1-40
1.11.2.3 BIPH252/255 and 452/455 International ...................................... 1-41
1.11.2.4 BIPH352/355 Domestic ................................................................ 1-42
1.11.2.5 BIPH352/355 International ........................................................... 1-39