Technical information
1
Servicing should only be performed by a Qualied Service Technician
TABLE OF CONTENTS
INTRODUCTION ......................................................................2
QUALIFICATIONS .....................................................................2
TOOLS REQUIRED ....................................................................3
INSTALLATION CONSIDERATIONS .......................................................4
GAS AND ELECTRICAL CHARACTERISTICS ...............................................4
GAS PRESSURE – REQUIREMENTS .....................................................4
FEATURES AND COMPONENTS – ALL MODELS ............................................8
BLOWER AND BURNER ASSEMBLY ......................................................9
SPARK IGNITER, FLAME SENSOR, SIGHT GLASS .........................................11
VENTING ...........................................................................12
VENTING TABLES – TECHNICAL VENTING DATA ..........................................14
OPERATION AND SERVICE ............................................................16
DIAGNOSTIC SEQUENCE OF OPERATION – FLOW CHART .................................17
SEQUENCE OF OPERATION – FLOW CHART .............................................18
LIGHTING AND OPERATING LABEL .....................................................19
TROUBLESHOOTING .................................................................20
CONTROLS OVERVIEW - CONTROL BOX ASSEMBLY ......................................21
PRESSURE SWITCHES – ALL MODELS ..................................................22
HIGH LIMIT SWITCH/ DIGITAL THERMOSTAT .............................................23
CONTINUITY CHECK OF HIGH LIMIT (ECO)...............................................25
UPPER TEMPERATURE PROBE CONTINUITY CHECK ......................................26
LOWER TEMPERATURE PROBE CONTINUITY CHECK .....................................27
IGNITION CONTROL..................................................................28
START UP/ FLAME RECOVERY/ SAFETY LOCKOUT........................................29
VARIABLE FREQUENCY DRIVE – ALL MODELS ...........................................31
CHARACTERISTICS AND FUNCTIONS OF THE CONTROL TERMINALS ........................32
VFD – BLOWER SPEED AND FREQUENCY READINGS .....................................32
WIRING DIAGRAM – ALL MODELS.......................................................33