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ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 1 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
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
ADJUSTMENT PROCEDURE: .........................................5
GAS PRESSURE .............................................................5
SUF120 AND 150 MODELS..............................................5
HIGH ALTITUDE INSTALLATIONS ...................................5
SUF 120 - 150 .................................................................5
INSTALLATION QUICK TIPS - SUF 199 AND 250 GAS
PRESSURE .....................................................................6
ADJUSTMENT PROCEDURE:..........................................6
GAS PRESSURE .............................................................6
SUF 199 AND 250 MODELS ............................................6
HIGH ALTITUDE INSTALLATION......................................6
INSTALLATION QUICK TIPS - SUF 300, 400 GAS
PRESSURE......................................................................7
ADJUSTMENT PROCEDURE:..........................................7
GAS PRESSURE..............................................................7
SUF 300,400,....................................................................7
HIGH ALTITUDE ADJUSTMENT ......................................7
SUF 300,400,....................................................................7
INSTALLATION TIPS - SUF 300, 400 ...............................8
VENTING TABLES SUF 120 – 250....................................9
VENTING TABLES SUF 300,400,.....................................9
VENTING - ALL MODELS – SINGLE PIPE POWER VENT –
USING ROOM AIR..........................................................10
VENTING – ALL MODELS – TWO PIPE DIRECT VENT –
USING OUTSIDE AIR.....................................................11
VENT TERMINATION – DIRECT VENT – ALL MODELS..12
DIRECT VENTING – ALL MODELS.................................13
CONTROL OVERVIEW ..................................................14
CONTROL OVERVIEW – ALL MODELS..........................14
ADJUSTING TANK TEMPERATURE – OPERATING SET
POINT - DIFFERENTIAL.................................................15
CHANGING THE DISPLAY UNITS..................................16
FAULT AND WARNING CONDITIONS – ADVANCED
DIAGNOSTIC INFORMATION.........................................17
ACCESS TO THE CURRENT FAULT OR WARNING.......18
VIEWING THE FAULT HISTORY - VIEWING
INFORMATION ABOUT THE HEATER............................19
CONTROL SEQUENCE (TYPICAL ALL MODELS).........20
CONTROL SEQUENCE FLOW CHART...........................21
CONTROLS – CENTRAL CONTROL BOARD – CCB ......22
CONTROLS – GAS VALVE SUF 120...............................23
CONTROLS – GAS VALVE SUF 150...............................23
CONTROLS – GAS VALVE SUF 199 and 250..................24
ADJUSTMENT PROCEDURE:........................................24
GAS PRESSURE ...........................................................24
SUF 199 AND 250 MODELS ..........................................24
CONTROLS – GAS VALVE SUF 199 and 250..................25
CONTROLS – GAS VALVE , ORIFICE CHART–
SUF300,400,...................................................................26
CONTROLS – PRESSURE SWITCHES – ALL MODELS..27
CONTROLS – PRESSURE SWITCHES – SUF 120 through
250.................................................................................28
CONTROLS – PRESSURE SWITCHES – SUF 300,400,..29
CONTROLS – CONNECTIONS, IGNITER, FLAME
SENSOR, SIGHT GLASS, POWERED ANODES.............30
HOT SURFACE IGNITER / FLAME SENSOR / CONTROL
TIMING...........................................................................31
BLOWER SPEED CONTROL SUF 199 AND 250.............32
VARIABLE FREQUENCY DRIVE – SUF 400...................33
VARIABLE FREQUENCY DRIVE - BLOWER SPEED AND
PRESSURE READINGS..................................................34
WIRING DIAGRAM – SUF 120 – 300 ..............................35
WIRING DIAGRAM – SUF 400,.......................................36