State Industries SUF100150, SUF100199 User Manual

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COMMERCIAL GAS WATER HEATERS

SERVICE HANDBOOK

HIGH EFFICIENCY

FOR MODELS:

 • SUF60120

 • SUF100150

 • SUF100199

 • SUF100250

 • SUF130300

 • SUF130400

COMMERCIAL GAS SERIES

PRINTED 0509 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

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

Servicing should only be performed by a Qualified Service Agent 198152-002

INTRODUCTION

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

The service handbook is designed to aid in servicing and trou bleshooting S tate W ater Heaters Ultra Force SUF commercial water heaters i n t he f ield. No duplication or reproduction of t his bo ok m ay be m ade without the ex press w ritten authorization o f State Water Heaters .

The fol lowing tex t and i llustrations w ill provide you with a step by step procedure to verify pr oper i nstallation, opera tion, and troubleshooting procedures. Additional quick reference da ta i s i ncluded to ass ist you in servicing these products.

The information contai ned i n this handbook is designed to answer co mmonly face d situations enc ountered in the ope ration of this product l ine and is not meant to be all

QUALIFICATIONS

inclusive. If you are experiencing a problem not covered in this handbook, please contact State Water Heaters Technical Information at 1-800-365-0024, by e mail at

help@statewaterheaters.com

or your local State Water Heater representative for further assistance.

Our website:www.statewaterheaters.com

is also a resource for installation and service information. Thi s handbook i s i ntended for use by licensed plumbing professionals and reference should be made to the installation manual accom panying the prod uct. This handbook contains supplemental information to the produ ct’s i nstallation and ope ration manual.

ANSI Z223.1 Sec 3.3.83

"Qualified Agency"

"Any individual, firm, corporation or company that ei ther i n person o r through a representative i s e ngaged i n an d i s responsible for (a) the installation, testing or replacement of g as p iping or (b) the connection, i nstallation, testing, re pair or servicing of appliances and equipment; that is experienced i n such work; that is familiar with all precautions required; and that has complied w ith al l the re quirements o f the authority having jurisdiction."

Service of this water heater requires ability equivalent to th at of a Qual ified S ervice Agent (l icensed t radesman) i n the fi eld involved. Installation skills such as plumbing, air supp ly, vent ing, gas s upply, e lectrical supply are r equired i n addition to electrical testing ski lls. S ome pro ducts m ay requ ire combustion testi ng equipment and certification. If you do not possess these skills or do not h ave the pr oper t ools y ou should not attem pt to serv ice thi s w ater heater.

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

TOOLS REQUIRED

● ELECTRICAL MULTIMETER CAPABLE OF MEASURING CONTINUITY/ OHMS, AC

& DC VOLTS, AMPERES, MICROAMPERES, MILLIVOLTS, and FREQUENCY(Hz)

○ UEi Model DL289 or equivalent

● DIGITAL MANOMETER + 60” W. C. in .01” increments

Note: A digital manometer is required for testing pressure switches and can replace a gas pressure gauge, draft gauge or slack tube manometer for checking gas pressure.

○ UEi model EM200 or equivalent

● WATER PRESSURE GAUGE w/ LAZY HAND AND HOSE BIBB CONNECTION

● THERMOMETER

● 1-1/16 INCH SOCKET WITH EXTENSION FOR ANODE REPLACEMENT

● SET OF NUMBERED DRILL BITS

WATER PRESSURE

TEST GAUGE W/ LAZY

HAND AND HOSE BIBB

CONNECTION

DIGITAL MANOMETER

DIGITAL MULTIMETER

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

GENERAL INFORMATION

INSTALLATION REQUIREMENTS FOR THE COMMO NWEALTH OF MASSACHUSETTS

For al l side w all terminated, hor izontally vented power v ent, direct vent, and power direct v ent gas fueled w ater heat ers installed i n ev ery dwelling, building or structure used in w hole or i n p art for residential pur poses, including t hose ow ned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied:

INSTA LLATION OF CARBON MONOXIDE DETECTORS

At the time of installation of the side wall horizontal vented gas fueled equipment, the installing plumber or gas fitter s hall observe that a hard wired carbon monoxide detector with an alarm and battery backup is in stalled on t he f loor le vel wh ere t he g as equipment is t o b e i nstalled. In add ition, t he installing plumber or gas fitter shall obs erve t hat a battery operated or har d w ired carbon monoxide detector w ith an al arm i s i nstalled on eac h additional level of the dwelling, building or structure served by the sidewall horizontal vented gas fueled equipment. It s hall b e the re sponsibility o f the property owner to secure t he services of q ualified licensed pr ofessionals for the i nstallation of har d wired carbon monoxide detectors. In the event that the s ide wall hor izontally v ented gas fueled

equipment is installed i n a c rawl space or an attic, the hard wired carbon monoxide detector with alarm and battery back-up may be installed on the nex t adjacent f loor l evel. I n t he e vent t hat the requirements of this subdivision can not be met at the t ime of c ompletion o f i nstallation, t he ow ner shall have a period of thirty (30) days to comply with the a bove requirements p rovided t hat dur ing said thirty ( 30) day p eriod, a bat tery op erated carbon monoxide detector with an alarm shall be installed

APPROVED CARBON MONOXIDE DETECTORS

Each carbon monoxide de tector as r equired in accordance with the above provisions shall comply with N FPA 720 and be AN SI/UL 20 34 listed and CSA certified.

SIGNAGE

A m etal or p lastic i dentification plate s hall b e permanently mounted to the exterior of the b uilding at a minimum height of eight ( 8) feet ab ove grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment. The sign shall read, in print size no less than one-half (1/2”) inch in size,

“GAS VENT DIRECTLY BELOW. KEEP CLEAR

OF ALL OBSTRUCTIONS.”

GAS PRESSURE SPECIFICATIONS

MODELS

Maximum Gas Supply Pressure

Nominal Gas Suppl y Pressure

Minimum Gas Supply Pressure (Low Gas Press. Switch Setting)

Manifold Pressure

Natural

120-150

10.5” W C

(2.59kPa)

7.0”WC

(1.74kPa)

4.8”WC

(1.20kPa)

4.0”WC

(0.98kPa)

Servicing should only be performed by a Qualified Service Agent 198152-002

Propane

120-150

14.0“WC

( 3.45kPa)

11.0“WC

( 2.74kPa)

8.5“WC

( 2.12kPa)

10.0“WC

(2.49 kPa)

Natural

199-250

10.5“WC

(2.59kPa)

7.0“WC

(1.74kPa)

4.8”WC

(1.20kPa)

0“WC

( 0 kPa)

Propane

199-250

14.0“WC

( 3.45kPa)

11.0“WC

( 2.74kPa)

8.5“WC

( 2.12kPa)

0“WC

( 0 kPa)

Natural

300/400/500

11.0”WC

(2.74kPa)

7.0”WC

(1.74kPa)

5.2”WC

(1.54kPa)

4.00“WC

( 1.25kPa)

Propane

300/400/500

14.00”W C (3.49kPa)

11.0”WC

(2.74kPa)

11.0“WC

( 2.74kPa)

10.0“WC

( 2.49kPa)

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

INSTALLATION QUICK TIPS – SUF 120 and 150 GAS PRESSURE

ADJUSTMENT PROCEDURE: GAS PRESSURE SUF120 AND 150 MODELS

a. Attach a pressure gauge (manometer) to the manifold pressure tap and refer to page 4 for correct pressure.

Main line gas pressure to the water heater for natural

gas should be between a maximum of 10.5"W.C.

(2.59kPa) for natural gas, 14.0"W.C.(3.45kPa) for

propane and a minimum of 4.8W.C.(1.18kPa) for

Natural Gas, and 8.5"W.C. (2.08kPa) for Propane Gas.

A supply gas pressure regulator (service regulator) must be installed on the gas supply line within 10' (305 cm) of the unit.

Also see gas pressure specification table on page 4.

1.Check gas line pressure with a manometer.

2.Check manifold pressure gauge (manometer) connected to the manifold pressure tap on the gas control valve, If full rate adjustment is required, remove cover screw from top of the gas control valve. Using a small screwdriver, turn adjusting screw clockwise to increase or counterclockwise to decrease gas pressure to obtain 4.0" W.C.(1 K pa) for natural gas and 10.0" W.C. (2.5 kPa) for L.P. Gas.

3. Cycle the burner on and off several times to check its operation.

4. Check the operation of the limit and operating controls.

5. Check the vent system seams and joints and ensure that there is no discharge of flue products into the room.

6. Check the input rate.

HIGH ALTITUDE INSTALLATIONS SUF 120 - 150

For appliance installation locations with elevations

above 6,500 feet (1982 meters) consult the “High

Altitude Installation” section of the owners manual.

b. Use this formula to “clock” the meter. Be sure

other gas consuming appliances are not operating during this interval.

Btuh = 3600 X H/ T

T = Time in seconds to burn 1 cubic foot of gas. (With a stopwatch read the gas meter and measure the amount of time required for the heater to consume 1 cubic foot of gas.) H = Heating value of gas (in Btu’s per cubic foot of gas). Btuh = Actual heater input rate, in Btuh. EXAMPLE: (Using SUF-150 heater) T = 25.25 seconds H = 1050 Btu/ft.3 BTUH = ?

Compare result to the de-rated input required for the elevation at the installat ion location.

Should it be necessary to adjust the gas pressure to the burner, to obtain the full input rate, the steps below should be followed: c. Remove the pressure regulator cover screw and adjust the pressure by turning the adjusting screw with a small screwdriver. Do not exceed 4.0" (1 kPa) natural gas models and 10.0" w.c. (2.5kPa) on the propane models. Clockwise to increase gas pressure and input rate. Counterclockwise to decrease gas pressure and input rate. d. “Clock” the meter as in step (b) above. e. Repeat steps (c) and (d) until the specified input rate is achieved. f. Turn the manual gas valve to “OFF”. Replace the pressure regulator cover screw. Remove the pressure gauge or manometer from the manifold pressure tap. Replace the set screw in the manifold pressure tap. If the gas pressure regulator cannot be adjusted to give the full input rating with sufficient gas pressure at the valve, check to ensure the unit is equipped with the correct orifice.

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

INSTALLATION QUICK T IPS - SUF 199 AND 250 GAS PRESSURE

ADJUSTMENT PROCEDURE: GAS PRESSURE SUF 199 AND 250 MODELS

IMPORTANT NOTE

THE SUF 199 AND 250 MODELS INCORPORATE A NEW GAS CONTROL, WHICH OPERATES AT A MANIFOLD PRESSURE OF 0" W.C. (0 kPa) FOR BOTH NATURAL AND PROPANE GAS. SEE T HE GAS PRESSURE CHART ON PAGE 4. THESE MODELS ARE CONFIGURED PRIOR TO BEING SHIPPED FROM THE FACTORY AND NO ADJUSTMENTS ARE NECESSARY PRIOR TO STARTUP. THE CONTROLLER MONITORS T HE AIR FLOW AND MAKES ADJUSTMENTS TO THE FAN SPEED WHICH IN EFFECT CONTROLS THE AMOUNT OF GAS FLOW. THEREFORE, THE UNIT WILL SELF ADJUST TO ACQUIRE THE CORRECT AMOUNT OF INPUT.

"Supply gas pressure to the water heater must not exceed a maximum of 10.5" w.c. (295kPa) for natural gas, or 14" w.c. (3.45 kPa) for propane. The minimum supply gas pressure is 4.8" w.c. (1.20 kPa) for natural gas and 8.5" w.c. (2.12 kPa) for propane gas."

HIGH ALTITUDE INSTALLATION

The SUF 199 and 250 models are suitable for installation up to 10,100 feet above sea level with no adjustments.

GAS ORIFICE

The SUF 199 and 250 models do not have a natural gas orifice. A .230” orifice is used on LP gas models.

Venturi Gasket

w/o orifice

Gas Control Without Orifice

Natural Gas

Venturi

Gasket w/

LP Gas

Orifice

(.230”

Brass)

Gas Control with .230” LP Orifice

Once the unit is installed and filled with water and the inlet pressures confirmed, simply turn the switch "on" and observe operation. Cycle the unit "off" and "on" several times to ensure proper operation.

A supply gas pressure regulator (service regulator) must be installed on the gas supply line within 10' (305 cm) of the unit.

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

INSTALLATION Q UICK TIPS - SUF 300, 400 GAS PRESSURE

ADJUSTMENT PROCEDURE: GAS PRESSURE SUF 300,400,

A minimum dynamic gas suppl y pressure of

5.2" w.c. (1.29 kPa) for Natural Gas and 11" w.c. (2.74 kP a) for LP Gas is requir ed befo re making any adjustment to th e gas control pressure regulator. Attempts to adjust the

regulator during periods of low gas supply pressure could result in over firing of the water heater when the gas supply pressure returns to normal.

1. Check gas line pressure with a manometer, adjust the gas supply line pressure Gas Pressure table on page 4.

2. Check manifold pressure using a pressure gauge (manometer) connected to the manifold pressure tap on the gas control valve, If full rate adjustment is required, remove cover screw from top of the gas control valve. Using a small screwdriver, turn adjusting screw clockwise to increase or counter clockwise to decrease gas pressure to obtain 4.0" w.c. (0.996 kPa) for Natural Gas and 10" w.c. (2.49kPa) for LP gas.

3. Cycle the burner on and off several times to check its operation.

4. Check the operation of the limit and operating controls.

5. Check the vent system seams and joints and ensure that there is no discharge of flue products into the room.

6. Check the input rate as shown on page 5.

HIGH ALTITUDE ADJUSTMENT SUF 300,400,

For high altitude adjustments, contact the help line on the front of the water heater or contact help@statewaterheaters.com .

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

INSTALLATION TIPS - SUF 300, 400

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

VENTING TABLES SUF 120 – 250

Maximum equivalent feet of intake and vent pipe using 3” PVC is 50 feet (15.2m). Equivalent feet must include any 90° elbows (two 45° elbows equal one 90° elbow). Three inch diameter 90° elbows are equivalent to 5' (1.5m) of pipe.

Maximum equivalent feet of intake and vent pipe using 4” PVC is 120 feet (36.6m). Equivalent feet must include any 90° elbows (two 45° elbows equal one 90° elbow). Four inch diameter 90° elbows are equivalent to 5' (1.5m) of pipe.

Vent Length Table Equi valent Feet (Meters) 120 thro ugh 25 0

Number of 90°

Elbows ONE (1) 7/2.1 45/13.7 115/35 TWO (2) 7/2.1 40/12.2 110/33.5

THREE (3) 7/2.1 35/10.7 105/ 32

FOUR (4) 7/2.1 30/9.1 100/30.5

FIVE (5) 7/2.1 --- 95/29

SIX (6) 7/2.1 --- 90/27.4

3" Minimum

Pipe (Ft./M.)

3" Maximum

Pipe (Ft./M.)

VENTING TABLES SUF 300,400,

Vent Length Table Equivalent Feet (Meters) 300,400,

Number of 90°Elbows

ONE (1) 65' / 19.7 m

TWO (2) 60' / 18.2 m

Maximum Feet / meters of Pipe

4" PVC

4"Maximum

Pipe (Ft./M.)

THREE (3) 55' / 16.7 m

FOUR (4) 50' / 15.2 m

FIVE (5) 45' / 13.6 m

SIX (6) 40' / 12.1 m

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

VENTING - ALL MODELS – SINGLE PIPE POWER VENT – USING ROOM AIR

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

VENTING – ALL MODELS – TWO PIPE DIRECT VENT – USING OUTSIDE AIR

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

VENT TERMINAT ION – DIRECT VENT – ALL MODELS

WHEN LOCATING THE TERMINALS ON A SIDEWALL, THE FOLLOWING SPECIFICATIONS PERTAINING TO TERMINAL LOCATION MUST BE FOLLOWED.

1. The intake vent terminal and the exhaust vent terminal must terminate on the same exterior wall and must be located at a minimum of 24" (61cm) from the vertical centerline of the exhaust vent terminal (see Figure 9). In colder climates increasing the 24" (61cm) minimum will reduce possibility of frost over from side winds blowing exhaust vapors to the air intake of the direct vent.

2. The horizontal centerline of the intake vent terminal may not be located

lower than the horizontal centerline of the exhaust vent terminal

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

DIRECT VENTING – ALL MODELS

The air intake provided on the unit contains a mesh screen to prevent large particles from entering the

unit. WHEN THE UNIT IS TO BE SET UP AS A DIRECT VENT, THE BALANCE PLATE AND MESH

SCREEN MUST BE REMOVED BEFORE GLUING PIPE TO THE CONNECTOR. THE INLET VENT PIPE MAY THEN BE GLUED TO THE AIR INTAKE PROVIDED ON THE UNIT.

45° PVC Elb ow

Remove the balance plate and mesh screen before gluing intake air pipe to the fitting.

3” 120-25 0

4” 300- 400

Two 3” or 4” 45° PVC elbows with mesh screens are provided with each unit. Both elbows are to be used in direct vent applications. The screens are provided to keep vermin and large debris from entering the intake air and exhaust vent runs.

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

CONTROL OVERVIEW

CONTROL OVERVIEW – ALL MODELS

Interaction with the water heater controller is done

through an LCD display called the Universal Interf a c e Mod ule (UIM).This screen is also referred to as the “desktop” or “desktop menu”. Up and down

buttons and three operation buttons allow navigation through the control menus and to make adjustments to the water heater. Operation of the three lower buttons is defined immediately above them on the screen.

While the water heater is operating, the user interface will display the desktop screen (if there are no active faults or warnings).

● An example of this screen is shown below.

● The first temperature on this screen is the

temperature of the water inside the tank.

● The second temperature on this screen is the

Operating Set Point.

● The Operating Set Point is the temperature at

which the water heater will maintain the water inside the tank.

● The third line on the screen is a text

description of the Operational State of the

water heater. The operating state of the water heater is also indicated graphically by status icons.

The table of status icons describes graphically operational details of the water heater. Below is a legend of all the status icons:

Status

Description

Icon

The t emperature o f the water in the tank has fallen and the water heater will now initialize a new heating cycle.

The t emperature o f the water in the tank has

reached the Operating Set Point.

The cont rol i s un able t o i nitiate any f urther heating cycles. This is usually caused by a fault condition detected by the control, but can also occur when an external system (like an energy management sys tem) has as ked t he w ater heater to discontinue any further heat cycles.

The blower is being energized.

The blower pressure switch has been made.

The igniter has been energized.

The igniter has been energized and sufficient curr ent for ignition has been detected.

The cont rol has requested that the gas valve be turned on.

The control has sensed flame in the burner.

The control has detected a fault condition. A fault condition will cause the water heater to discontinue operation.

OPERATION

BUTTONS

UP AND

DOWN

BUTTONS

Servicing should only be performed by a Qualified Service Agent 198152-002

The control has detected a warning condition. These conditions w ill not cause t he water heater to discontinue further heating cycles, but does merit attention.

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

ADJUSTING T ANK TEMPERATURE – OPERATING SET POINT - DIFFERENTIAL

The Operating Set Point of this water heater

determines the regulated temperature for the water in the tank. This parameter is adjusted in the desktop Temperature menu. Items in this menu allow you to monitor different temperature readings in the tank

along with adjusting the Operating Set Point and Differential.

ACTION: From the desktop screen, press Menu. DISPLAY:

ACTION:

Press Change then use the UP and DOWN buttons to

change the temperature Set Point.

DISPLAY:

Note: This procedure can also be used to change the

Differential. The tank Upper and Lower Temperatures

are not user changeable. They are determined by the temperature probes on the heater.

ACTION:

From the Main Menu, press Select to enter the

"Temperatures" screen.

DISPLAY:

ACTION:

Press Update to accept the change or Cancel to reset

it.

DISPLAY:

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

CHANGING THE DISPLAY UNITS

The desktop menu has the option of selecting between degrees Fahrenheit and degrees Celsius for temperature displays. This can be found in the “Display Settings” menu. Also in this menu, you may adjust how the back-light operates and the contrast of the LCD screen.

ACTION:

From the Main Menu, press the DOWN button to highlight "Display Settings" then press Select.

DISPLAY:

ACTION:

Press Update to accept the change or Cancel to

reject it.

DISPLAY:

ACTION:

Use the UP and DOWN buttons to highlight the desired setting. Then press Change. Again, use the UP and DOWN buttons to scroll through the options

for that setting.

DISPLAY:

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

FAULT AND WARNING CONDITIONS – ADVANCED DIAGNOSTIC INFORMATION

This w ater heat er c ontrol has t he abil ity t o m onitor almost all aspects of the w ater heater's oper ation. In the c ase t hat there i s an undes irable or uns afe condition t hat o ccurs, t he water heat er control will detect t his c ondition and de termine the appropriate action. T he w ater heat er c ontrol will di splay t he information on the desktop in plain text that accurately describes the condition and diagn ostics i nformation that can be used to correct the issue.

There are t wo t ypes o f c onditions t hat c an oc cur

during operation. These are Warnings and Faults: Warnings: This is a non-safety related condition that

the c ontrol has det ected t hat m ay c ause the w ater heater to operate in a less than optimal condition, but does not pose a safety concern.

NOTE: When t hese conditions oc cur, continued

heating cycles will continue and the heater will attempt

to regulate the water in the tank to the Operati ng Set

Point. Example of a Warning:

Faults: This is a safety related condition that has been

detected by the heater.

NOTE: W hen these conditions occur, the water heater WILL NOT CONTINUE any further heating cycles and

the water will no longer be heated until the condition is corrected and, in most cases, power has been cycled.

Example of a Fault:

Advanced Diagnostic Information

When a fault or warning has been declared, advanced information can be found in t he c ontrol. By pressing the A dvanced but ton, det ailed i nformation can be found regarding diagnosing and resolving the problem.

WARNING: Usage of the Advanced information requires ability equivalent to that of a licensed tradesmen in the field involved.

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

ACCESS TO THE CURRENT FAULT OR WARNING

When a fault or warning has been detected by the control it will automatically be displayed on the screen and the back light will blink. If you choose to leave the

current fault or warning by pressing the Back key, you

can always return to the fault through the display menu through the menu.

ACTION: Press the DOWN button for more information.

DISPLAY:

ACTION:

To get to the current fault information screen, press

Menu. DISPLAY:

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

VIEWING THE FAULT HISTORY - VIEWING INFORMATION ABOUT TH E HEATER

The controller for this water heater will store a history

of ten of the last Fault and Warning conditions that

occurred. This is stored in the Fault History. The information about the fault or warning will include diagnostic information as well as an estimate of how long ago the fault occurred.

ACTION: Press the SELECT button for more information.

DISPLAY:

Viewi ng Inf ormation A bout t he W ater Heater

The control for this water heater monitors many different aspects of the water to ensure safe and optimal operation. Much of the information monitored is available to view in two areas of the control. The

first is the "Heater Status" and; the second is "Heater Informatio n. "

These items can be selected through the desktop menu. In these menus, detailed information about the water heater and the current status of specific conditions can be found.

ACTION:

Press the DOWN key to scroll through the fault

history. If you select a specific fault or warning, you

may press the VIEW button to view details regarding

this fault.

DISPLAY:

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

CONTROL SEQUENCE (TYPICAL ALL MODELS)

TYPICAL SEQUENCE

1. When the control is powered it should display “waiting for connection” and “UIM v2.06”*. The manufacturer and unit model will be next. The next display will include water temperature, temperature setting and heater status. * This number may change as software revisions are made.

2. The control performed selected system diagnostic checks immediately upon power up. This includes confirming the proper state of the air/gas switches and ECO limit device and powered anodes.

3. If the control determines that the actual water temperature inside the tank is below the programmed temperature set-point less the differential, a call for heat is activated.

4. If all checks are successfully passed, the combustion blower is energized for the pre-purge cycle.

5. When the pre-purge cycle is complete, power is applied to the igniter element for the igniter warm-up period.

10. The combustion blower will run for the duration of the post purge cycle to purge the system of all combustion gases. When the post purge cycle is complete, the blower is de-energized and will coast to a stop.

11. The control will now enter the idle state while continuing to monitor the internal tank water temperature and the state of other system devices. If the temperature drops below the set-point value less differential, the control will automatically return to step 2 and repeat the entire operating cycle.

6. At the conclusion of the igniter warm-up period, the gas valve will open, allowing gas to enter the burner chamber.

7. The igniter will remain on for a short predetermined time period, then will be turned off.

8. The control will monitor the flame sense probe to confirm a flame is present. If a flame is not verified within predetermined time period, the gas valve will immediately be closed, and the blower will continue to run for approximately 30 seconds inter-purge. The control will try for ignition two more times before

Blow er icon

indicates

pow er to the

blow er

Check mark in the box

indicates the blow er

proving sw itch contacts

are made

Flame icon indicates burner is ignited and

that flame has been

sensed.

lockout.

9. If a flame is confirmed, the control will enter the heating mode where it will continue heating the tank water until the set point temperature plus differential is reached. At this point, the gas valve is closed and the control enters the post-purge cycle.

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

CONTROL SEQUENCE FLOW CHART

Power on

Control displays

model ,

temperat ure

setting and

st atus

If checks are not

passed the

control will

display an error

or warning .

The cont rol will

st ore an error

history to show

what fault occurred

and the time

elapsed since t he

fault.

The control

performs internal

system checks

and determines

tank temperat ure

is below s et point

If all checks are

passed and there is

a call for heat the

blower is ener gized

for a pre purge

cycle

When the pre

purge is complete

power is appl ied to

the i gnit er for

Warm-up.

At t he conclusion

of the igniter

warm up the gas

valve w il l open for

4 seconds .

If the control

senses f lame the

water heater will

fire unti l the set

point is reached .

If the c ontrol fai ls

to see flame the

blower will continue to

run for a 30 s econd

Inter purge . There will

be 3 trials f or ignit ion

before a fault is

declared .

At the c onclusion

of t he inter purge

the i gnit er will

warm and the gas

valve will open.

At t he conclusion

of t he heating

cycle the blower

will enter a post

purge cycle and

the control will

enter an idle state .

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

CONTROLS – CENTRAL CONTROL BOARD – CCB

The Central Control Board or CCB is contained in the housing shown below. Access to the board and the wiring harness plugs can be accomplished by removing two Phillips screws holding the cover.

This view shows the cover removed from the CCB.

Remove these

screws to release

cover

The CCB is controlled by the settings given through the desk top menu (UIM). The CCB also monitors all pressure switches, the hot surface igniter, tank temperatures, the gas valve, the anodes, and the flame sensor.

The CCB directly controls blower speed on the SUF199 and 250 models and indirectly controls blower speed on the SUF 400 by means of a Variable Frequency Drive (see page 33).

Note: Improper operation may be the result of a loose connection. Please check all wiring connections and the power supply to the water heater.

This is the back of the UIM.

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

CONTROLS – GAS VALVE SUF 120

The gas control valve on the SUF 120 has a built i n adj ustable pre ssure regulator. T he adjustment screw is accessed by removing the cap screw m arket regulator i n t he illustration.

Inlet gas pressure may be read a t the inlet pressure tap only if the manual shut off valve (gas cock) i s in the “ON” position. Leaving the knob in the “OFF” position will not allow the bu rner to fi re an d w ill genera te a fault code on th e UIM ( Universal I nterface Module).

CONTROLS – GAS VALVE SUF 150

The gas control valve on the SUF 150 is has a built in pressure regulator. The regulator may be adjusted by removing the cap screw marked “regulator” in the illustration.

Inlet gas pressure may be read at the i nlet pressure tap only if the manual switch is set the “ON” position.

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

CONTROLS – GAS VALVE SUF 199 and 250

ADJUSTMENT PROCEDURE: GAS PRESSURE SUF 199 AND 250 MODELS

IMPORTANT NOTE

THE SUF 199 AND 250 MODELS INCORPORATE A NEW GAS CONTROL, WHICH OPERATES AT A MANIFOLD PRESSURE OF 0"W.C. (0 kPa) FOR BOTH NATURAL AND PROPANE GAS. SEE THE GAS PRESSURE CHART ON PAGE 4. THESE MODELS ARE CONFIGURED PRIOR TO BEING SHIPPED FROM THE FACTORY AND NO ADJUSTMENTS ARE NECESSARY PRIOR TO STARTUP. THE CONTROLLER MONITORS THE AIR FLOW AND MAKES ADJUSTMENTS TO THE FAN SPEED WHICH IN EFFECT CONTROLS THE AMOUNT OF GAS FLOW. THEREF ORE, THE UNIT WILL SELF ADJUST TO ACQUIRE T HE CORRECT AMOUNT OF INPUT.

Supply gas pressure to the water heater for natural gas should be between a maximum of 10.5" (2.59kPa for natural gas) W.C. (14.0"/3.45kPa for propane) and a minimum as shown on page 4: that is, for Natural Gas 4" (.98kPa) W.C. And 9.0" (1.97kPa) for Propane Gas. The inlet gas pressure must not exceed the maximum value.

Once the unit is installed and filled with water and the in let p ressures c onfirmed, s imply turn the switch "on" and observe operation. Cycle the unit "off" and "on" several times to ensure proper operation.

HIGH ALTITUDE INSTALLATION

The SUF 199 and 250 models are suitable for installation up to 10,100 feet above sea level with no adjustments.

GAS ORIFICE

The SUF 199 and 250 models do not have a natural gas orifice. A .230” orifice is used on LP gas models.

Venturi Gasket

w/o orifice

Gas Control Without Orifice

Natural Gas

Venturi

Gasket w/

LP Gas

Orifice

(.230”

Brass)

A supply gas pressure regulator

Gas Control with .230” LP Orifice

(service regulator) must be installed on the gas supply line within 10' (305 cm) of the unit.

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

CONTROLS – GAS VALVE SUF 199 and 250

Pressure readings may be taken on the gas valve by connecting to the pressure ports on the valve. The manifold pressure on this valve is 0”w.c. (0kPa) when the water heater is running. Refer to the gas pressure chart on page 4.

Note: Tubing shown on pressure connections is installed for manometer connections. It is not supplied with the water heater.

WARNING: Do not attempt adjustments on this gas valve unless you have a combustion analyzer. Contact the “help line” listed on the water heater for assistance.

Manifold

gas

Pressure

Supply

gas

pressure

0” WC

(0kPa)

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

CONTROLS – GAS VALVE , ORIFICE CHART– SUF300,400,

The gas cont rol va lve h as a bu ilt in field adjustable pressure regulator. The regulator may be adjusted by removing the cap screw marked “regulator”. The adjustment screw is underneath. The g as val ve for the SUF Natural gas model is shown above. This is a 24V. solenoid operated gas valve.

Manual Gas

Control Knob

ORIFICE CHART – SUF 300,400,

Model 300 400

Natural .27 4” .314”

LP .189” .219”

Low Gas Pressure

Switch

24V

Solenoid

connection

Refer to the replacement parts information at the back of this manual for part numbers for Natural and LP gas valves for all SUF 300, 400, and models.

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

CONTROLS – PRESSURE SWITCHES – ALL MODELS

All SUF models are provided with four pressure switches. T hese s witches ar e es sential to the safe an d pr oper op eration o f the uni t. T he switches are wired to the c entral control b oard (CCB) individually an d ea ch i s monitored individually. The (CCB) is set up to shut the unit down whenever there is a failure o f any of the

switches and declare a fault for each individual

switch. It is important to understand the purpose of each switch.

Low Gas Press ure

Sw itch

Pressure

Sw itches

BLOCKED OUTLET PROVING SWITCH

The blocked outlet proving switch electrical contacts

are normal ly clo sed. The blocked outlet proving switch el ectrical c ontacts w ill open on a rise in pressure. Check t o see i f t he c ondensate i s

allowed to f low f reely from the exhaust elbow and for obstructions in the exhaust venting and exhaust vent t erminal. Also c heck the t hat t he equivalent feet of vent pipe for the specific model has not been exceeded. Check the vent length tables on page 9

BLOCKED INLET PROVING SWITCH

The Blocked Inlet Proving switch electrical contacts

are normally closed. The bl ocked i nlet pr oving

switch el ectrical c ontacts w ill op en when an

increase in neg ative pressur e (vacuum ) occurs

in the intake vent pipe. The switch is connected to the pressure tap on t he PV C flange connected to the i nlet of the b lower. W hen this switch pr events the u nit f rom ig niting, most li kely the in take is blocked by s ome means. Verify that the air intake pipe and ai r i ntake v ent t erminal ar e f ree of obstructions that may prevent air from entering the unit. Also check the that the equivalent feet of vent pipe for the specific model has not been exceeded. Check the vent length tables on page 9

LOW GAS PRESSURE SWITCH

BLOWER PROVING SWITCH

The Blower Proving S witch i s pr ovided on t he heater t o v erify that t he f an i s op erating. It i s a positive pr essure s witch w hose electrical c ontacts

are normally open. Th e blower p roving switch electrical contacts will close on a rise in pre ssure

as the blower increases the pressure in the burner. This s witch i s c onnected t o t he b urner t ap b y a piece of Tygon (s oft pl astic) t ubing. This t ubing must b e connected in order f or the switch to close the el ectrical contacts. T he c ontroller requires that the el ectrical contacts on t his p ressure switch b e open before it will allow the blower to come on. The control w ill declare a f ault on the U IM if ei ther condition occurs.

Servicing should only be performed by a Qualified Service Agent 198152-002

The Low Gas Pr essure Switch electrical contacts

are normal ly open. The low gas pressure switch electrical c ontacts w ill close on a rise pressure.

The c ontacts w ill open w hen t he p ressure falls below the fixed set point. If this happens during a heating cycle a the burner will b e shut down and a fault will be declared on the UIM.

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

CONTROLS – PRESSURE SWITCHES – SUF 120 through 250

BLOCKED INLET

PRESSURE SWITCH

MODEL PRESSURE

All 0.85”WC

Normally Closed / Open on a Rise in

Pressure

Tolera nce +/- . 05” WC

LOW GAS PRESSURE

SWITCH MODEL PRESSURE Natural 4.0”WC LP 8.0”WC

Normally Open / Close

on a Rise in Pressure

Tolerance +/-.05”WC

BLOCKED OUTLET

PRESSURE SWITCH

MODEL SWITCH 120N +1.2”WC 150N +0.98”WC 199N +1.06”WC

250N +4.0”WC

120LP +1.3”WC

150LP +1.3”WC

199LP +4.0”WC

250LP +2.0”WC

Normally Close d /

Open on a Rise in

Pressure

Tolera nce +/- . 05” WC

BLOWER PROVER

PRESSURE SWITCH

MODEL PRESSURE

All +.075”WC

Norm ally Open / Close

on a Rise in Pressure

Tolerance +/-.05”WC

Top View of Pressure Switches

Note: Check the website www.statewaterheaters.com

for Technical Bulletin S023-06 “Air

Pressure Switches” under “Literature/Service Handbooks”

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

CONTROLS – PRESSURE SWITCHES – SUF 300,400,

BLOCKED INLET

PRESSURE SWITCH

MODEL PRESSURE 300 -.085”WC 400 -1.25”WC 500 -1.35”WC

Norm ally Closed/

Open on a Rise in

Pressure

Tolera nce +/- . 05” WC

LOW GAS PRESSURE

SWITCH

MODEL PRESSURE

Na tural +4.6”WC LP +9.0”WC

Norm ally Open/

Close on a Rise in

Pressure

Tolerance +/-.05”WC

BLOWER PROVER

PRESSURE SWITCH

MODEL PRESSURE

300 +1.0”WC 400 +2.5”WC 500 +4.5 'WC

Nor mally Open / Close on

a rise in Pressur e

Tolerance +/-.05”WC

BLOCKED EXHAUST

PRESSURE SWITCH

MODEL PRESSURE

300 +1.15”WC 400 +1.39”WC 500 +1.77”WC

Normally Close d /

Open on a Rise in

Pressure

Tolera nce +/- . 05” WC

Top View of Pressure Switches

SUF 300,400,

Note: Check the website www.statewaterheaters.com

for Technical Bulletin S023-06 “Air

Pressure Switches” under “Literature/Service Handbooks”

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

CONTROLS – CONNECTIONS, IGNITER, FLAME SENSOR, SIGHT GLASS, POWERED ANODES

The connections for the hot surface i gniter and the fl ame sense rod are shown below. Also shown is the burner sight glass. These features are typical for all models.

Flame

Sensor

Hot Surface Igniter

The new U ltra Force com mercial w ater heater i s eq uipped w ith pow ered an odes. These anodes never need replacement. The CCB monitors the cur rent th rough t he anodes and will declare a fault if there i s a disconnected wire or i f there is no water in the tank.

Powered anode connection

Burner Mounting

Bolts

Burner Sight Glass

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

HOT SURFACE IGNITER / FLAME SENSOR / CONTROL TIMING

HOT SURFACE IGNITER

This water i s eq uipped with an electric hot surface i gniter. The i gniter m aterial i s silicone carbide and sho uld not be handled with bare hands because of possible damage to the igniter.

The norm al ohm read ing at 77°F is listed between 40 and 70 ohm s. T he minimum igniter current monitored by the CCB is 2.7 amps. Once this threshold is met a check mark w ill a ppear by th e i gniter i con i n the UIM (display).

FLAME SENS O R

This water hea ter is eq uipped w ith an electronic f lame sensor. The flame sensor senses fl ame by passi ng a s mall electric current through the burner flame. This type of f lame s ensing is al so k nown a s fl ame rectification. T he CCB is l ooking fo r a minimum current of .7 micro amperes for the water heater to operate. Once this current is established the UIM will display a flame icon.

CONTROL TIMING

Pre-purge 25 seconds

Igniter Warm-up 17 seconds

Trial for ignition Gas Control Open

5 seconds

Inter/Post Purge 30 seconds

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

BLOWER SPEED CONTROL SUF 199 AN D 250

The i nput of the S UF 199 an d S UF 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 t he b lower i s rece iving 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 +/

Model Hz Hz

199 N 133

250 N 133

199 LP 200

250 LP 266

156

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 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.

Meter red probe

connected to

open terminal on

plug

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

VARIABLE FREQUENCY DRIVE – SUF 400

The Ultra Force SUF 400 model has a variable frequency drive (VFD) that controls the

rpm of the blower motor. The VFD receives a signal from the central control board that instructs the VFD to transmit the proper frequency to the blower to produce the proper blower speed and proper input.

Three conditions must be met for the frequency drive to start the blower:

1. 120VAC must be supplied to the VFD 120VAC input.

2. The ignition control board closes an enable circuit – terminals LI1 and +15V

3. The ignition control board sends a 1-10VDC instruction – terminals 0V and AI1. See table

on the next page for voltage and frequency information.

GROUND HOT NEUTRAL

R/L1 N

BLOWER MOTOR WIRES

BLACK WHITE RED

U/T1 V/T2 W/T3

NOTE: BE SURE TO MATCH WIRE

COLORS WHEN CONNECTING BLOWER

WIRES OR BLOWER MAY RUN

BACKWARD AND CAUSE A FAULT.

VARIABLE FREQUENCY DRIVE

155

RC RA 0V AI1 +5V DO LI1 LI2 LI3 LI4 +15V

1-10 VDC Speed Instruction Enable Disable Circuit

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

VARIABLE FREQUENCY DRIVE - BLOWER SPEED AND PRE SSURE READINGS

The instructions for the VFD are sent from the CCB to in the form of a DC current. The chart below lists the current readings, the frequency signal displayed by the VFD, and the pressure switch settings needed for the CCB to let the burner operate. The frequency numbers displayed may vary slightly with slight variations in the DC voltage generated by the CCB. If the water heater exhibits poor run characteristics check the frequency display. If the frequency is more than 5% out of range, check the DC volt signal at the terminals shown on page 33.

Voltage – Frequency – Speed Instructions - VFD Model SUF

400

Instruction Volts DC

Terminals 0V and AI1

Ignition (low speed) 7.53 150 Hz+/- 2 5.3”

Purge (high speed) 7.77 155 Hz+/- 2 5.85”

VFD Part Number 197500-000

0 – 10

VDC

Volts Frequency Pressure

W.C.”

155

Frequency is displayed

in the red LED. 155Hz

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

WIRING DIAGRAM – SUF 120 – 300

Servicing should only be performed by a Qualified Service Agent 198152-002

ULTRAFORCE COMMERCIAL GAS WATER HEATER

SUF 120 thru 400 SERVICE HANDBOOK

WIRING DIAGRAM – SUF 400,

Servicing should only be performed by a Qualified Service Agent 198152-002

500 Tennessee Waltz Parkway

Ashland City, TN 37015

www.statewaterheaters.com

State Industries SUF100150, SUF100199 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual