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Servicing should only be performed by a Qualied Service Agent
TABLE OF CONTENTS
INTRODUCTION ......................................................................2
QUALIFICATIONS .....................................................................2
TOOLS REQUIRED ....................................................................3
GENERAL INFORMATION...............................................................4
GAS PRESSURE SPECIFICATIONS ......................................................4
INSTALLATION QUICK TIPS – SUF 120 AND 150 GAS PRESSURE .............................5
INSTALLATION QUICK TIPS – SUF 199 AND 250 GAS PRESSURE .............................7
INSTALLATION QUICK TIPS – SUF 300, 400, 500 GAS PRESSURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
INSTALLATION QUICK TIPS – SUF 300, 400, 500............................................9
INSTALLATION – VENTING CATEGORY AND MATERIALS ...................................10
VENTING TABLES – SUF 120 - 250 ......................................................11
VENTING TABLES – SUF 300, 400, 500...................................................11
CONCENTRIC VENTING...............................................................12
VENT CONDENSATION ...............................................................13
VENTING – ALL MODELS – SINGLE PIPE POWER VENT – USING ROOM AIR ...................14
VENTING – ALL MODELS – TWO PIPE DIRECT VENT – USING OUTSIDE AIR ...................15
VENT TERMINATION – DIRECT VENT – ALL MODELS ......................................16
DIRECT VENTING – ALL MODELS.......................................................17
CONTROL OVERVIEW ................................................................18
ADJUSTING TANK TEMPERATURE – OPERATING SET POINT – DIFFERENTIAL.................20
CHANGING THE DISPLAY UNITS .......................................................22
FAULT AND WARNING CONDITIONS – ADVANCED DIAGNOSTIC INFORMATION ................24
ACCESS TO THE CURRENT FAULT OR WARNING .........................................25
FAULT CODES.......................................................................26
VIEWING THE FAULT HISTORY – VIEWING INFORMATION ABOUT THE HEATER................27
CONTROL SEQUENCE (TYPICAL ALL MODELS) ...........................................28
CONTROL SEQUENCE FLOW CHART ...................................................29
CONTROLS – CENTRAL CONTROL BOARD – CCB.........................................30
CONTROLS – GAS VALVE SUF 120......................................................32
CONTROLS – GAS VALVE SUF 150......................................................32
CONTROLS – GAS VALVE SUF 199 AND 250 ..............................................33
CONTROLS – GAS VALVE SUF 199 AND 250 ..............................................34
CONTROLS – GAS VALVE, ORIFICE CHART – SUF 300/400..................................35
CONTROLS – GAS VALVE, ORIFICE CHART – SUF 500 .....................................36
CONTROLS – PRESSURE SWITCHES – ALL MODELS ......................................37
CONTROLS – PRESSURE SWITCHES – SUF 120 THROUGH 250 .............................38
CONTROLS – PRESSURE SWITCHES – SUF 300, 400, 500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
CONTROLS – CONNECTIONS, IGNITER, FLAME SENSOR, SIGHT GLASS, POWERED ANODES ...40
HOT SURFACE IGNITER / FLAME SENSOR / CONTROL TIMING ..............................41
BLOWER SPEED CONTROL SUF 199 AND 250 ............................................42
VARIABLE FREQUENCY DRIVE – SUF 400 AND 500........................................43
VARIABLE FREQUENCY DRIVE – BLOWER SPEED AND PRESSURE READINGS................44
WIRING DIAGRAM – SUF 120 - 300......................................................45
WIRING DIAGRAM – SUF 400, 500 ......................................................46