State Industries SUF100150, SUF100199 manual Blower Speed Control SUF 199, Model

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ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

BLOWER SPEED CONTROL SUF 199 AND 250

The input of the SUF 199 and SUF 250 is determined by the blower. The input of the water heater may be determined by clocking the meter as shown on page 5 or by making sure the blower i s receiving the proper Hz signal. The blower rpm is controlled by the Central Control Board (CCB). The signal to the blower may be measured by attaching a MULTIMETER that has a Hertz (Hz) setting as shown in the illustration to the right. If the Hz signal is within +/

Meter black lead is connected to ground (not shown) and the red lead is connected to an open te rminal o n bl ower spee d con trol connection.

Model	Hz	Hz

199 N	133	87

250 N	133	87

199 LP	200	156

250 LP	266	96

Note: R emoving the plug show n in the illustration will cause the blower to accelerate and the input of the water heater to increase to a much higher rate.

Meter red probe

connected to

open terminal on

plug

State Water Heaters – Technical Training Department 32

Ashland City, Tennessee © 2009

Servicing should only be performed by a Qualified Service Agent

198152-002

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Contents Service Handbook Ultraforce Commercial GAS Water Heater Table of ContentsQualifications IntroductionDigital Multimeter Tools RequiredGeneral Information GAS Pressure SpecificationsHigh Altitude Installations SUF 120 Adjustment Procedure GAS Pressure SUF120 and 150 ModelsGAS Orifice High Altitude InstallationSUF 300,400 High Altitude Adjustment SUF 300,400Installation Tips SUF 300 Vent Length Table Equivalent Feet Meters 120 through Venting Tables SUF 120Venting Tables SUF 300,400 Vent Length Table Equivalent Feet Meters 300,400Venting ALL Models Single Pipe Power Vent Using Room AIR Venting ALL Models TWO Pipe Direct Vent Using Outside AIR Vent Termination Direct Vent ALL Models Direct Venting ALL Models Status Description Icon Control Overview ALL ModelsDisplay Adjusting Tank Temperature Operating SET Point DifferentialChanging the Display Units Fault and Warning Conditions Advanced Diagnostic Information Access to the Current Fault or Warning Viewing Information About the Water Heater Control Sequence Typical ALL Models Control Sequence Flow Chart Remove these Screws to release Cover Controls Central Control Board CCBControls GAS Valve SUF Important Note High Altitude Installation SUF 120 thru 400 Service Handbook Controls GAS Valve SUF 199Supply gas pressure Orifice Chart SUF 300,400 Controls GAS Valve , Orifice CHART- SUF300,400Blocked Outlet Proving Switch Controls Pressure Switches ALL ModelsTop View of Pressure Switches Blocked Inlet Pressure Switch Odel Pressure Controls Pressure Switches SUF 300,400Ultraforce Commercial GAS Water Heater HOT Surface Igniter / Flame Sensor / Control Timing Control TimingFlame Sensor Model Blower Speed Control SUF 199Ground HOT Neutral Blower Motor Wires Black White REDAI1 LI1 LI2 LI3 LI4Voltage Frequency Speed Instructions VFD Model Variable Frequency Drive Blower Speed and Pressure ReadingsSUF 400Wiring Diagram SUF 120 Wiring Diagram SUF Tennessee Waltz Parkway Ashland City, TN