Frymaster BIPH52/55, MPH52/55 SERIES

iii

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