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H50 SERIES GAS FRYERS
TABLE OF CONTENTS
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CHAPTER 1: Service Procedures
1.1 Functional Description.......................................................................................................1-1
The Electronic Ignition System..........................................................................................1-1
Interface Boards.................................................................................................................1-2
Thermostats........................................................................................................................1-5
1.2 Accessing Fryers for Servicing..........................................................................................1-5
1.3 Cleaning the Gas Valve Vent Tube....................................................................................1-5
1.4 Checking the Burner Manifold Gas Pressure.....................................................................1-6
1.5 Measuring Flame Current ..................................................................................................1-8
1.6 Replacing Fryer Components ............................................................................................1-8
1.6.1 Replacing the Controller or the Controller Wiring Harness ...............................1-8
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 ............................................................................1-9
1.6.5 Replacing an Ignitor Assembly.........................................................................1-10
1.6.6 Replacing or Cleaning a Combustion Air Blower ....................................................1-10
1.6.7 Replacing a Gas Valve......................................................................................1-13
1.6.8 Replacing a Burner Assembly...........................................................................1-14
1.6.9 Replacing the Frypot.........................................................................................1-15
1.6.10 Replacing Frypot Insulation and/or Upper Burner Rails ..................................1-16
1.7 Troubleshooting and Problem Isolation...........................................................................1-21
1.7.1 Ignition Failures................................................................................................1-21
1.7.2 Improper Burner Functioning ...........................................................................1-22
1.7.3 Improper Temperature Control.........................................................................1-24
1.7.4 Computer-Related Problems.............................................................................1-25
1.7.5 Filtration Problems............................................................................................1-26
1.7.6 Leakage.............................................................................................................1-29
1.7.7 Basket Lift Malfunctions ..................................................................................1-29
1.7.8 Interpretation of Digital Controller Lights........................................................1-32
1.8 Troubleshooting Guide ....................................................................................................1-32
Probe Resistance Chart ....................................................................................................1-37
1.9 Simplified Wiring Diagrams............................................................................................1-38
1.10 Principal Wiring Connections..........................................................................................1-43
1.11 Wiring Diagrams – Main ................................................................................................1-44
1.12 Wiring Diagrams – Transformer Boxes...........................................................................1-50
1.13 Wiring Diagrams – Basket Lifts ......................................................................................1-52
1.14 Wiring Diagrams – Filter Boxes......................................................................................1-55
1.14 Wiring Diagrams – Oil Return.........................................................................................1-56
CHAPTER 2: Parts List
2.1 Accessories ........................................................................................................................2-1