State Industries STC-074 User Manual

SBN 71120 through 85390 (A)
SERIES 100 Models

SBN Meets Low NOx Requirements of SCAQMD
Rules 1121 & 1146.2

Service

Handbook

For Self-Cleaning

Induced Draft

Multi Flue Commercial

Gas Water Heaters

Part No. STC-074

For propane inputs and other more detailed information,

$20.00 Printed in the U.S.A. 0204

visit www.statewaterheaters.com to view or download Specification Sheets.

2

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

TABLE OF CONTENTS

SBN Service Handbook Introduction ................................................2-3

Installation Considerations ...................................................................4

Clearances .......................................................................................4

Exterior Clearance............................................................................ 5

Air Supply .........................................................................................6

Contaminated Air.............................................................................. 9

Flammable Items .............................................................................. 9

Gas Valve ....................................................................................... 10

Outlet View ..................................................................................... 11

Venting ........................................................................................... 12

Technical Data Venting ..............................................................13-14

Sequence of Operation........................................................................15

Top View .........................................................................................15

Front View....................................................................................... 16

White Rogers Control .....................................................................17

HSI Board .......................................................................................18

Wiring Diagram............................................................................... 20

Electrical Sequence .......................................................................21

Pre-Service Checklist...........................................................................22

Control Board Diagnostic LED Interpretation and Troubleshooting

120 VAC Check to Heater ...............................................................23

Polarity Check ................................................................................ 24

Continuity Check of High Limit ....................................................... 25

Upper Temperature Probe Check ................................................... 26

Inducer Check ................................................................................ 27

Blower Prover/Low Gas Pressure Circuit Check ............................ 28

HSI Voltage and Continuity Check ................................................. 29

Igniter and Gas Valve Circuit Check ...............................................30

Gas Valve Coil Continuity Check.................................................... 31

Flame Prover Check ....................................................................... 32

Water Temperature Circuit Check ................................................... 33

Technical Training Department ©2003

Ashland City, Tennessee

1

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

TABLE OF CONTENTS

Troubleshooting - Conditions .............................................................34

LED Troubleshooting...........................................................................36

Parts List ...............................................................................................38

General Questions and Answers ........................................................ 41

Electrical Information ...........................................................................44

Draft Proving (Pressure) Switch T able................................................44

SB

N Service Handbook Introduction

This service handbook is a supplement to the SBN Installation and Operation Manual.
The handbook provides information on servicing and troubleshooting State Industries
SBN water heaters in the field. While this handbook is not intended to be all inclusive, it
contains:

• step-by-step procedures with illustrations to verify proper installation, operation,
and troubleshooting

• quick reference data to assist in servicing the product line

• answers to common questions encountered in the operation of the product
line

The handbook is intended to be used by licensed plumbing professionals. Reference
should be made to the installation manual accompanying the product. If you are
experiencing a problem not covered in this handbook, please contact the State
Industries Technical Information Department at 1-800-527-1953 or your local State
Industries representative for further assistance.

No duplication or reproduction of this book may be made without the expressed
written authorization of the State Industries.

©2003

2

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

Qualifications

Installation or service of this water heater requires ability equivalent to that of a
licensed tradesman in the field involved. Plumbing, air supply, venting, gas supply and
electrical testing skills are required.

Tools Required

• Phillips head screwdriver

• standard screwdrivers

• 3/8 and 7/16 inch open end wrench

• set of marked drill bits

• electrical multimeter tester capable of measuring continuity, AC voltage and DC
voltage

• gas pressure gauge or manometer (gauge - pt. no. 8099-2)

• water pressure gauge (pt. no. 4798)

• thermometer (pt no. 4870 - range 0 - 220 degrees F)

• 1/2 inch socket with extension for removal of the clean out cover

• 1-1/16 inch socket with extension for anode removal

Custom Commercial Storage Tank Model Number Break Down

U G V 66 01500 V A

V = Vertical

H = Horizontal

100# or 125# or 150# or 160#

A = ASME

U = Unjacketed
J = Jacketed

G = Glass-Lined
E= Epoxy
B = Black Steel
C + Cement

V = 5 Year

Warranty

Gallon Capacity

Diameter

SPECIAL NOTE: All model number appearing on rating plate and carton labels will
be compressed. Example: UGV6601500VA125

Technical Training Department ©2003

Ashland City, Tennessee

3

1 2 5

ASME Pressure Rating =

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

g

SERVICE HANDBOOK

INSTALLATION CONSIDERATIONS

This portion of the handbook reviews some often overlooked installation considerations
—clearances, air supply, gas pressure requirements, and venting—taking note
of necessary installation requirements for SBN . The installation manual
covers most of these items in detail.

Clearances

A 24-inch clearance for all serviceable parts is recommended. Clearances may vary
between models. See instruction manual or the label on the heater for clearances
applicable to your specific model.

Top and Front Views of Minimum Clearances To Combustibles

Minimum Clearances To Combustibles

Model "A" Right

Side
SBN 71-120NE, SBN- 81-154NE, SBN 81-180NE, SBN 100-199NE 2" 2" 2" 12"
SBN 100-250NE(A), SBN 100-275NE(A), SBN 85-310NE(A) 3" 3" 3" 12"
SBN 85-366NE(A) 6" 6" 6" 6"
SBN 85-390NE(A) 4" 4" 4" 4"

"B" Left Side "C" Back "D"

Ceilin

A, B, and C clearances to non-combustibles is “0” inches - a 12 inch clearance to cover
remains unchanged.

©2003

4

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

Exterior Clearance

The illustration below shows the required clearances for venting units using
natural draft venting.

Required Exterior Clearances

“Copyright by the American Gas Association. Used by permission of the copyright holder”.

The vent must extend at least 3 feet above the highest point where it passes through
a roof of a building and at least 2 feet higher than any portion of a building within a
horizontal distance of 10 feet (for vents of 12 inches in diameter or less).

References: NFPA 54 ANSI Z 223.1 SEC 7.5.2a and Sec 7.6.2a may allow reduction
to 8 feet with a “listed vent cap.”

Technical Training Department ©2003

Ashland City, Tennessee

5

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

Air Supply

Stoichiometric or theoretical complete combustion requires 10 cubic feet of air per
1,000 BTUH of gas supplied. The National Fuel Gas code also recommends an
additional 2.5 cubic feet of “excess” air.
For information on minimum make-up air opening sizes for various building installations,
refer to the National Fuel Gas Code NFPA 54, ANSI Z223.1, Sec. 5.3.

10 CU.

FT.

COMB.

1,000

BTU

AIR

2.5 CU.
FT.

EXCESS

AIR

Insufficient make-up air is a major cause of combustion problems.

Insufficient Make-Up Air - Backdraft

One common example is in a restaurant installation where exhaust vent equipment was
not considered in sizing make-up requirements. This condition may result in air being
backdrafted by the restaurant exhaust equipment through the heater causing the draft
proving switch to open and/or erratic heater shutdown.

©2003

6

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

A fresh supply of make-up air for combustion can be supplied to the heater through
make-up air ducts, which directly communicate with the outdoors.

Make-Up Air – Direct Communication

(Not Direct Vent)

Two openings are required: one within 12 inches of the top of the enclosure and one
within 12 inches of the bottom of the enclosure. Each opening must have a free area
of not less than 1 square inch per 4,000 BTUH of the total input of all appliances
within the enclosure.
The lower opening primarily provides combustion air. The upper opening provides
vent dilution air and acts as a relief opening for flue gases should the vent become
obstructed or a downdraft condition occur. Additionally, when the heater is installed in
a confined space and communicating with the outdoor air, one permanent opening,
beginning within 12 inches (30 cm) of the top of the enclosure, must be permitted
where the equipment has clearances of at least 1 inch (2.5 cm) from the sides and
back, and 6 inches (16 cm) from the front of the appliance. The opening must directly
communicate with the outdoors and must communicate through a vertical or
horizontal duct to the outdoors or spaces (crawl or attic) that freely communicate with
the outdoors, and must have a minimum free area of a) 1 square inch per 3,000 BTUH
(7cm2 per kW) of the total input of all equipment located in the enclosure and b) not
less than the sum of the areas of all vent connectors in the confined space.

Technical Training Department ©2003

Ashland City, Tennessee

7

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

Often, it is more practical to install vertical make-up ducts to the outdoors.

Make-Up Air - Vertical Ducts

Again, two openings are required: one within 12 inches of the top of the enclosure
and one within twelve inches of the bottom of the enclosure. Each opening must
have a free area of not less than 1 square inch per 4,000 BTUH of the total input of
all appliances within the enclosure.

Make-Up Air - Horizontal Ducts

When the heater is installed in an interior room with no roof access for vertical ducts,
horizontal make-up air ducts should be installed. When using horizontal ducts, two
openings are required - one within 12 inches of the top of the enclosure and one within
12 inches of the bottom of the enclosure. Each opening must have a free area of not
less than 1 square inch per 2,000 BTUH of the total input of all appliances within the
enclosure.

©2003

8

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

Along with adequate make-up air, the quality of the air is important.

Contaminated Air

RustRust

Rust

RustRust

ChipsChips

Chips

ChipsChips

Contaminants in combustion air can lead to premature heater failure. Vapors from
bleaches, soaps, waxes, salts, etc. are drawn into the combustion chamber with the
make-up air and, once fired, mix with water vapor in the gases to form extremely
corrosive hydrochloric or hydrofluoric acid and other corrosive by-products.

Air for Combustion – Flammable Items

Flammable items, pressurized containers or any other potentially hazardous articles
must never be placed on or adjacent to the heater. Open containers of flammable
material should not be stored or used in the same room with the heater.

Technical Training Department ©2003

Ashland City, Tennessee

9

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

The supply gas pressure is
normally measured at the gas
valve inlet gas pressure tap,
if available, when the gas is flowing.
The manifold gas pressure
is measured at the manifold
pressure tap of the gas valve
when the gas is flowing.

Gas valves used are 24 volt AC
combination-step opening gas
valves. They incorporate the
main valve and gas pressure
regulator into one body. The
Low Gas Pressure Switch, the
Supply Gas Inlet, and the
Supply Gas Pressure Tap are
shown in the Inlet View to the
right.

Gas Valve

Inlet View

Top View

The top view of the gas valve,
shown on the right, shows the
Main Gas Regulator, Manifold
Pressure Tap, Top Knob, and the
Limited Bleed Vent Port. The main
gas regulator is found under the
silver cap screw. It is factory preset
to 3.5 inches W.C. and
adjusts gas pressure output
from 3.0 to 5 inches water
column. Caution: Always test
the manifold pressure at the
outlet when the gas is flowing.

©2003

10

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

The outlet view of the Gas
Valve, shown on the right,
shows the Manifold Gas
Outlet Connection, the two
24 volt Main Valve (MV)
Solenoid connections, and
the Manifold Pressure Tap.
The two yellow wires from
the 12-pin plug on the
Ignition Board attach to the
MV terminals.

SERVICE HANDBOOK

Outlet View

Technical Training Department ©2003

Ashland City, Tennessee

11

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

Venting

All SBN water heaters are classified by ANSI as Category I (non-condensing,
negative pressure venting) appliances. They are approved for type B vent. The draft
inducer does not pressurize the exhaust.

Venting – Atmospheric Multiple Heaters

For larger applications, SBN water heaters can be common vented together,
either in a tapered manifold or constant size manifold. Follow the National Fuel Gas
Codes requirements for sizing and installation of fan-assisted products.
SBN Models may be common vented only with other Category I appliances. See the
Venting Section in the National Fuel Gas Code.

©2003

12

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

A

A

SERVICE HANDBOOK

When vents are combined, the area of the com­bined vent should be equal to area of the largewst
single vent, plus 50% of area of all others joining.

EXAMPLE: To combine two 6” vents with

an 8” vent, the area of a
combined vent should be
one half area of two 6 inch
vents (14 + 14) plus area of 8 inch vent (50)
or 78 sq. inches. Referring to char, 78
sq. inches require 10” diameter vent.

NINE RULES FOR

GOOD VENTS

rea in

Vent Size

5" 20 10" 79
6" 28 12" 113
7" 38 14" 154
8" 50 16" 201
9" 64 18" 254

Square Inches Vent Si ze

rea in

Square Inches

1. The vent pipe should ALWAYS
be the same size as the outlet of
the draft diverter or factory
supplied vent reducer.

• Model SBN 120 are
supplied with a 6” to 5”
reducer.

• Models SBD 250, 251
and 275 are supplied
with a 8” to 6” reducer.

2. The diameter of a vent pipe
should NEVER be reduced, no
matter what the circumstances.

Technical Training Department ©2003

Ashland City, Tennessee

13

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

3. In some cases it may be
necessary to run a vent larger
than the draft diverter outlet.

SERVICE HANDBOOK

4. Take the maximum vertical
rise possible immediately
above the draft diverter.

5.

©2003

6. Horizontal pipe should be sloped
upward at a minimum of ¼” per foot.

7. Horizontal elements should be limited to
75% of the vertical rise of the vent above
the connection.

14

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

8. Flue gases must be kept hot for
proper venting.

9. Obstructions can cause down
drafts.

The vent pipe should be extended to
meet local codes.

Technical Training Department ©2003

Ashland City, Tennessee

15

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

TYPE B GAS VENT
Multiple Gas Fired Tank-Type Heaters

When venting multiple tank type heaters using Type
B vent pipe, follow the installation diagram (figure 4) and
tables below which give sizing and data based upon NFPA
54/ANSI Z223. 1992.

MODEL SBN 71-120NE
Input: 120,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 5 inches 6 8 10 15 20 30 50 100

Number of Combined Input

Heaters in Thousands of Btu/hr Manifold and Common Vent Diameter (Inches)

2 240,000 7 7 6 6 6 6 6 6
3 360,000 8 8 7 7 7 6 6 6
4 480,000 9 9 9 8 8 7 7 6

MODEL SBN 81-154NE
Input: 154,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100

Number of Combined Input
Heaters in Thousands of Btu/hr Manifold and Common Vent Diameter (Inches)

2 308,000 7 7 6 6 6 6 6 6
3 462,000 8 8 7 7 7 6 6 6
4 616,000 9 9 9 8 8 7 7 6

MODEL SBN 81-180NE, SBN 100-199NE
Input: 180,000, 190,000 and 199,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100

Number of Combined Input
Heaters in Thousands of Btu/hr Manifold & Common Vent Diameter (Inches)

2 380,000 7 7 7 6 6 6 6 6

3 570,000 7 6 6 6 6 6 6 6

4 760,000 6 6 6 6 6 6 6 6

Input Btu/hr Rise Vent Connector Diameter (Inches)

120,000 1 Ft. 6 6 5 5 5 5 5 5
120,000 2 Ft. 5 5 5 5 5 5 5 5
120,000 3 Ft. 5 5 5 5 5 5 5 5

Input Btu/hr Rise Vent Connector Diameter (Inches)

154,000 1 Ft. 6 6 6 6 6 6 6 6
154,000 2 Ft. 6 6 6 6 6 6 6 6
154,000 3 Ft. 6 6 6 6 6 6 6 6

Input Btuh/hr Rise Vent Connector Diameter (Inches)

180,000 1 Ft. 7 7 6 6 6 6 6 6
190,000 1 Ft. 7 7 7 6 6 6 6 6
199,000 1 Ft. 7 7 7 6 6 6 6 6
180,000 2 Ft. 6 6 6 6 6 6 6 6
190,000 2 Ft. 7 6 6 6 6 6 6 6
199,000 2 Ft. 7 7 6 6 6 6 6 6
180,000 3 Ft. 6 6 6 6 6 6 6 6
190,000 3 Ft. 6 6 6 6 6 6 6 6

199,000 3 Ft. 6 6 6 6 6 6 6 6

360,000 7 7 6 6 6 6 6 6

398,000 6 7 7 6 6 6 6 6
540,000 7 6 6 6 6 6 6 6

597,000 6 7 6 6 6 6 6 6
720,000 6 6 6 6 6 6 6 6

796,000 6 6 6 6 6 6 6 6

©2003

16

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

MODEL SBN 100-250NE TECHNICAL DA T A VENTING (Continued)

Input: 250,000 Btu/hr Total Vent Height (Feet)

Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100

Number Combined Input

of Heaters in Thousands of Btu/hr Manifold and Common Vent Diameter (Inches)

2 500,000 9 9 9 8 8 7 7 7
3 750,000 12 12 10 10 10 9 8 8
4 1,000,000 14 14 12 12 10 10 9 9

MODEL SBN 100-275NE

Input: 275,000 Btu/hr Total Vent Height (Feet)

Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100

Number of Combined Input

Heaters in Thousands of Btu/hr Manifold and Common Vent Diameter (Inches)

2 550,000 10 9 9 8 8 8 7 7
3 825,000 12 12 12 10 9 9 8 8
4 1,100,000 14 14 14 12 12 10 9 9

MODEL SBN 85-310

Input: 310,000 Btu/hr Total Vent Height (Feet)

Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100

Number of Combined Input

Heaters in Thousands of Btu/hr Manifold & Common Vent Diameter

2 620,000 10 10 9 9 8 8 7 7
3 930,000 14 12 12 12 10 9 9 8
4 1,240,000 14 14 14 12 12 12 10 9

MODEL SBN 85-366NE, SBN 85-390NE

Input: 366,000, 399,000 Btu/hr Total Vent Height (Feet)

Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100

Number of Combined Input

Heaters in Thousands of Btu/hr Manifold & Common Vent Diameter (Inches)

2 732,000 12 10 10 9 9 9 8 8

3 1,098,000 14 14 14 12 12 10 9 9

4 1,464,000 16 16 14 14 14 12 12 10

Input Btuh/hr Rise Vent Connector Diameter (Inches)

250,000 1 Ft 8 8 7 7 7 6 6 6
250,000 2 Ft 7 7 7 7 6 6 6 6
250,000 3 Ft 7 7 7 7 6 6 6 6

Input Btu/hr Rise Vent Connector Diameter (Inches)

275,000 1 Ft 8 8 7 7 6 6 6 6
275,000 2 Ft. 8 8 7 7 6 6 6 6
275,000 3 Ft 7 7 7 7 6 6 6 6

Input Btu/hr Rise Vent Connector Diameter (Inches)

310,000 1 Ft. 9 8 8 8 7 7 6 6
310,000 2 Ft. 8 8 8 7 7 7 6 6
310,000 3 Ft. 8 8 8 7 7 7 6 6

Input Btu/hr Rise Vent Connector Diameter (Inches)

366,000 1 Ft 9 9 9 8 8 8 8 8
399,000 1 Ft 10 9 9 9 8 8 8 8
366,000 2 Ft 9 9 8 8 8 8 8 8
399,000 2 Ft 9 9 9 8 8 8 8 8
366,000 3 Ft 9 8 8 8 8 8 8 8
399,000 3 Ft 9 9 8 8 8 8 8 8

798,000 12 12 10 10 9 9 8 8

1,197,000 14 14 14 12 12 10 10 9

1,596,000 16 16 16 14 14 12 12 10

Technical Training Department ©2003

Ashland City, Tennessee

17

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

(-)

(-)

(-)

SBN SEQUENCE OF OPERATION

Sequence

1. Thermistors (probes) call for
heat.

2. Inducer fan starts and
provides draft.

3. Hot surface igniter = 20 sec.
warmup.

4. Main gas valve opens 4 sec.
trial for ignition. (Maximum 5
trials.)

5. Main burner ignites and
proves.

6. Thermistors reach the
temperature setting.

7. Main burners “OFF”

- Auto restart after 60 min.

- 20 sec blower “interpurge”
between trials

SERVICE HANDBOOK

©2003

Top View

Draft Proving (Pressure) Switch Table

SBN Models Part No.

366 194411-0
275 194411-1

310 194411-2
120, 199, 250,
400

154, 180, 199 194411-4 (-) 2.60" ± .10"

18

194411-3 (-) 2.40" ± .10"

Technical Training Department

Ashland City, Tennessee

Pressure Setting To

Close Switch (Inches

W.C.)

1.60 ± .10"

2.00" ± .10"
1,75" ± .10"

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

FRONT VIEW OF WATER HEATER

Technical Training Department ©2003

Ashland City, Tennessee

19

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

WHITE ROGERS INTEGRA TED WA TER HEA TER CONTR OL

(PART NO . 194393-0) - ALSO CALLED “THERMOSA T”

©2003

20

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

HSI INTEGRATED IGNITION CONTROL BOARD

(PART NO. 194392)

E4

E1

Technical Training Department ©2003

Ashland City, Tennessee

21

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

LOWER FRONT VIEW OF SBN WATER HEATER

©2003

Notice that rods cross
main burner flame

.1 - .25”

HSI

Part Number 194405
Volts AC Nominal 80 VAC
Ohms Resistance 11.0 - 20.0 @ 77° F (25° C)

22

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

WIRING DIAGRAM

R

Upper ECO

{}

B

RB

Propane (series) models do not have a low gas presure switch.

Technical Training Department ©2003

Ashland City, Tennessee

23

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

ELECTRICAL SEQUENCE OF SBN WA TER HEA TER OPERA TION

120 VAC

Power to Heater

Green LED - On

Call for Heat

Green LED - On

Module Self Check

Closes -1.6 to -2.60 ± .10 W.C. depending on heater model

Variable Voltage

(80-120 VAC)

Low Gas Pressure

Switch is Closed

Draft Proving Switch

Is Open

High Limit is Closed

Inducer On

Blower Prover

Ignition Control Board –

120 VAC

HSI Warm Up

20 seconds

Gas Valve Open 3 Second Trial

HSI - Off

3 Seconds to Prove

Flame After HSI - Off

Flame Proves

Natural Gas Models Only

Minimum Millivolt for

4.25 seconds

©2003

Yes

Tank Heated to Set Temperature

Gas Valve – Off

Call for Heat LED - Off

60 Second Blower Post Purge

Blower Prover - Opens

Standby LED - On

No

20 Second Blower Purge

2 More Trials

To Prove Flame

Yes

Flash 8 Times On Diagnostic LED

Lock Out for 1 Hour

Yes

No

Then Retry

24

No

Flash 7 Times

1 Hour Auto Reset

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

PRE-SER VICE CHECKLIST

Use the following chec klist BEFORE y ou begin servicing the water heater.

1. Have you removed the cover from the controls?
____________________________________________________

Did you take notice of the status lights on the upper water
heater control?

____________________________________________________

Did you take notice of the red LED in the upper left corner of
the lower ignition control?

____________________________________________________

2. Did you note conditions of the room?
____________________________________________________

Where does the supply air come from?

____________________________________________________

Is the room clean?

____________________________________________________

What is stored with the heater?

____________________________________________________

How is the heater vented?

____________________________________________________

Are all water and gas shut-off valves open?

____________________________________________________

Are there room exhaust or air intake fans?

____________________________________________________

3. Did you note the condition of the water heater?
____________________________________________________

Is the ON/OFF switch “On”?

____________________________________________________

What is the temperature of the stored water? (T est at T&P valve
or nearby faucet.)

____________________________________________________

Is the thermal expansion tank installed?

____________________________________________________

4. Did you write down the complete model and serial numbers of
the water heater? If so, what are they?
____________________________________________________

5. Does the water heater have a good ground wire connection? If
not, the inducer will typically come on for a short time (3-5
seconds), then go off, and the red LED will flash 8 times.

Yes / No

Yes / No

Yes / No

Yes / No

Yes / No

Yes / No

Yes / No

Yes / No

Yes / No

Yes / No

Yes / No

Yes / No

Yes / No

Yes / No

Yes / No

Technical Training Department ©2003

Ashland City, Tennessee

25

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

p

SERVICE HANDBOOK

CONTROL BOARD DIAGNOSTIC LED INTERPRETATION AND

TROUBLESHOOTING

TEST 1 - 120 VAC CHECK TO WATER HEATER

Conditions:

 No Green display “Power” LED on.
 Plugs are in receptacles.
 Supply power breaker is not “open”
 On/Off heater switch is “On”.

Ignition Control

Board

Water Heater

Control

120 Vac Check To Water Heater On Switch

TEST 1

Check for 115-125 VAC black wire to ground



115 V check to E13 terminal and 2B receptical.

If… ...then

voltage
center black wire to ground
power
terminal

voltage

power

voltage
receptacle E2 black to ground

power is

©2003

is not present

is present

is not present

is present

is not present

resent

from on/off switch-

from center on/off

at E13 to ground

at E13

from heater control

at E2 green LED should be on.



check conditions above



check wiring from switch to break box
check power from on/off to ignition board term
E13.



check wiring from on/off. Left-outside terminal

to E13.



replace on/off switch.
check power from E14 to heater control E2
receptacle



check wiring from ignition control board E14 to

heater control receptacle E2.



replace ignition control board.

26

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

FLASH CODES OF DIAGNOSTIC INDICATOR

Conditions:

 Power On
 Red, heater control “Call for Heat” LED – on
 Red, ignition control board diagnostic LED – Flashing
 Note LED Flash Code before resetting heater.

LED Status Indication

1 Flash System is in lo ck out.
2 Flashes Draft proving (pressure) switch failed to open within 5 seconds at the end of the last cycle.

3 Flashes Draft proving (pressure) switch failed to close ( -2.1 inches of water column pressure) within 5

seconds after the inducer was started.

The low gas pressure switch )closes at 5.2" ± .04" w.c.) may have remained open.
4 Flashes Open on high temperature limit switch (ECO).
6 Flashes 115-volt supply power connection is indicating reversed polarity.
7 Flashes Flame sensor reads a low flame signal for more than 4.25 sec.
8 Flashes No ignition sensed.
Continuous Flash Continuous flame sensed for more than 5 seconds without gas valve being energized.

Continuous ON Internal control board failure.
*Control system self adjusts to use a minimum voltage for ignition. Lower voltage results in lower igniter temperature
which results in longer igniter life. Igniter voltage may vary from Nominal 80 VAC.

TEST 2 - POLARITY CHECK

Conditions:

 No hot water
 Green “Power” LED is on.
 Tank is more than 5° F

below temperature dial
setting.

 Red ignition control board

diagnostic LED is flashing
6 times between pauses.

 Red, diagnostic “Call for

Heat” LED-OFF.

Display

LED’s

Continued on next page

Technical Training Department ©2003

Ashland City, Tennessee

27

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

p

g

SERVICE HANDBOOK

TEST 2 - POLARITY CHECK - continued

Polarity Check

TEST 2

Check from on/off switch center and white wire terminals to ground

If… ...then

115-125 VAC
voltage
ground

round

is present

but not

is not

black (center terminal) to

resent

white (right terminal) to

see Test 1.

reverse supply wire connections - polarity is
reversed.

TEST 3 - CONTINUITY CHECK

OF HIGH LIMIT (ECO)

Conditions:

 Power On – No Hot Water
 Red, heater control “Call for Heat”

LED – on

 Red, ignition control board

diagnostic LED – 4 Flashing

 Note LED Flash Code before

resetting heater.

 See Description of diagnostic

LED Flashes.

 Turn Power “Off”

Continued on next page

©2003

28

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

y

SERVICE HANDBOOK

TEST 3 - CONTINUITY CHECK OF HIGH LIMIT (ECO)-CONTINUED

TEST 3

Continuity check of ECO (energy cut-off, high limit)

Black to Black wires of upper probe. Power is off.

If… ...then

continuity

continuity

water is less than 120° F

is indicated

is not present

opens at 203° F; closes at 193° F. If water is
below 193° F, continuity is correct.
replace ECO sensor, if water temperature is
below 193° F.

•

reset status LED should be on.

•

replace heater control if control will not manually

reset.

TEST 4 - UPPER TEMPERATURE PROBE CONTINUITY CHECK

Conditions:

 Power On - Water below tempera-

ture set point.

 Red, heater control “Reset Status”

LED-OFF

 “Call For Heat” LED off.

Ohms Resistance Table

° F Ohms

70° 11,884
120° 3,759
140° 2,488
180° 1,169

TEST 4

Upper Temperature probe continuity check

Red wire to red wire - Turn supply power "Off" for this test

If… ...then

test indicates

continuity

Technical Training Department ©2003

Ashland City, Tennessee

no continuit

is indicated

replace probe.
probe should be okay (also verify Ohms
resistance for water temperature). (Reading will
be approximate.)

29

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

g

g

SERVICE HANDBOOK

TEST 5 - CALLING FOR HEAT – NO

INDUCER OPERATION

Conditions:

 Power on
 Plugs in Receptacles
 Red “ Call for Heat” LED-ON
 Inducer “Off”

Note flash code on ignition control board

diagnostic LED

Diagnostic
LED

Water Heater

Control

Display
LED’s

Ignition Control Board

E4

TEST 5

115-120 V Check to Inducer

Test on Ignition Board 4 Pin Receptacle E4

If… ...then

•

reset control by interrupting power - note

pin 1 to ground check

pin 1 to ground

pin 3 to ground

©2003

has volta

has no voltage

has no voltage

e

possible reasons for this from flashing LED code

•

replace i

proceed

•

check wiring harness and plugs

•

replace inducer

30

ntion board

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

TEST 6 - INDUCER ON-NO IGNITION

Conditions:

 Power on
 Plugs in receptacles
 Inducer operating
 No power to Hot Surface Igniter (HSI)
 Note flash code of LED

Draft Exhaust

Draft Proving Pressure
Switch

Low Gas

Pressure

Switch

24 VAC Check of Blower Prover/Low Gas Pressure Circuit

TEST 6

If… ...then

igntion board receptacles E1, Pin 7 to ground

no volta ge

E1, Pin 7
voltage check of each blower switch terminal to
ground

24V

has 24 Volt

sho w s vol ta ge

is present

from eac h switch terminal to ground.

to ground check wire connection to and from inducer

to only 1 terminal

sh o w s

replace Ignition board

switch is open - check for proper draft (should

•

also s ee LED 3 flash code)

chec k for blocked exhaust

•

chec k that blower outlet exhaust damper is open

•

replace blower (draft) proving switch

•

check wiring from blower switch to low gas

•

pressure switch

Optional Hot
Water Outlet

Exhaust

Outlet

Inducer

voltage check to each terminal of low gas pressure
switch and ground

term i nal

voltage
and ground

Technical Training Department ©2003

Ashland City, Tennessee

is present

show s only voltage on 1

to each pressure switch terminal

switch is open - test for a minimum of 5.2 ± "

•

W.C. Natural Gas or 10.5" Propane, flowing
supply gas pressure (should also see 3 Flash
LED code)

replace low gas pressure switch

•

check wiring from low gas pressure switch to
ignition board recetacles E1, Pin 10

31

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

g

p

g

SERVICE HANDBOOK

TEST 7 - INDUCER ON – PROVER SWITCH AND LOW GAS SWITCH

CLOSED – NO IGNITER OPERATION

Conditions:

 Power on
 Plugs in receptacles
 Inducer on
 24V at ignition board

E1, Pin 10
 No Power to igniter
Note: Flash code of LED

Check E4 pin 4 to Ground

Continuity Test

E4 Plug

Check E1 pin 10

24V

Voltage check and continuity check of hot surface igniter circuit

TEST 7



Continuity check - Power off- Plug removed from E4 receptacles

Nominal 80 VAC check - Plug in E4- Power "On"

If… ...then



continuity
plug pin 2 to 4.

continuity

voltage is not present

to ground
volta
voltage
to

round

voltage

is not indicated

is present

e

is

resent

is not present

is present

between E4

between E4, Pin 2

between E4, Pin 4

check wiring and connection from E4 plug to

HSI receiving plug



replace HSI Assembly



resistance should be between 11 and 20 Ohms

at a temperature of 77°F



replace ignition board



continue



check wiring and plug connections to HSI



replace HSI



note igntion board, Flash code LED



HSI should work

Check E4 pin 2 to Ground

©2003

32

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

TEST 8 - IGNITER HEATS – NO MAIN BURNER

Conditions:

 Plugs in receptacle
 Igniter energizes (gets red)
 No main burner or main shuts off within 5 seconds.

Note flash code of LED.

Pin 9

24

E1 Plug, Pin 9
Plug in Receptacle

Test of Igniter and gas valve circuit

TEST 8

If… ...then

short heat up time of igniter

normal (Approximate 20 seconds)
warm up - no ignition

no voltage present

ground
24 Volt
12 to ground, but no main burner

was present

E4, Pin 12 to

from E1, Pin

•

check control box grounding

•

check for 24V from E1, Pin 12 to ground during 4

second trial.

- Yes - Continue

- No - Replace Igntion Board

replace ignition board

•

check that air has been purged from gas circuit

•

check that wiring and connections to gas valve and

E1, Pin 9 are correct

•

check for 24 VAC at E1, Pin 9 to ground during 4

second trial

Pin 12

24

E1 Plug, Pin 12
Plug in Receptacle

Technical Training Department ©2003

Ashland City, Tennessee

33

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

TEST 9 - IGNITER HEATS – NO MAIN BURNER

Conditions:

 Test 8 completed then:
 Turn off power
 Disconnect wires from gas valves

SERVICE HANDBOOK

TEST 9

Continuity Check Of Gas Valve Coil

If… ...then



check meter scale setting to read between 550

meter reads 0 or 1

meter indicates pilot and main coil

continuity

©2003

have

and 650 Ohms



replace Gas Valve



valve should be okay



still no gas to main burner, then coil may be

stuck - Replace Valve

34

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

TEST 10 - MAIN BURNER IGNITION FOR LESS THAN 5 SECONDS

Conditions:

 Power On – plug connected
 Main Burner ignites for approximately 5 seconds then goes out.
 Tests 8 and 9 completed
 Note flash code on ignition board LED.

Hot Surface Igniter

Pin 2

E1, Pin 2 - From Flame Proving Rod

TEST 10

Flame Prover Circuit Check

If… ...then
no extended

main burner igntion



check wiring and plug connections of HSI assembly

plug and ignition board receptacles E1, Pin 2



check that HSI assembly is not cracked or dirty



check that flame prover will be in main flame



replace HSI assembly

Main Burner

(Illustration of low NOx burner)

still no extended

Technical Training Department ©2003

Ashland City, Tennessee

main burner ignition replace ignition control board

35

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

TEST 11 - WATER HEATER SHUTTING OFF BELOW SETTING

Conditions:

 Main burner ignited
 Stored water is below temperature setting more than 5° F (Tank Average).
 Power off
 Plug disconnected from heater control board receptacle E3 and E4

Red

Black

Red

Water Temperature Circuit Check - Continuity

TEST 11

If… ...then

continuity check pin to pin of lower
temperature probe shows 1 or 0 (E4)

continuity check red wire pin to red wire pin
on upper temperature sensor shows 1 or 0
(E3)

all above checks are okay replace the water heater control.



see Test 4



check wiring and plug connections to heater

control board receptacle E4



replace lower temperature probe



see Test 4



check wiring and plug connections to heater

control board receptacle



replace upper temperature probe

©2003

36

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

DISPLAY LIGHTS ON INTEGRATED HEATER CONTROL

Red

Green

Red

Calling for heat

Calling for heat

The ECO (Energy Cut

The ECO (Energy Cut
Off) has opened.

Off) has opened.

Red

Action to be TakenIndicationLED Status

Action to be TakenIndicationLED Status

Normal status –

Normal status –
none

none

•Check for

•Check for

excessively hot

excessively hot
water (203° F or

water (203° F or
higher).

higher).

•Correct the

•Correct the

problem

problem
Check the breaker.No power

Check the breaker.No power

Tank is at a set

Tank is at a set
temperature of ± 2° F.

temperature of ± 2° F.

Tank has cooled

Tank has cooled
below 120° F

below 120° F
Preceded by “ECO

Preceded by “ECO
Open” indication

Open” indication

Technical Training Department ©2003

Ashland City, Tennessee

37

•Push the manual

•Push the manual

reset button.

reset button.

•Troubleshoot for

•Troubleshoot for

“why” the ECO

“why” the ECO
opened

opened

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

LED INDICATORS ON HOT SURFACE IGNITION (HSI)

USING FLASHING RED LED ON HSI (HOT SURFACE IGNITION)

LED STATUS INDICATION ACTION TO BE TAKEN

1 Flash

2 Flashes

3 Flashes

System is in lockout.

Draft proving
(pressure) switch
(closes at -2.10 +0.01
inches W.C. negative
pressure) failed to
open within 5 seconds
at the end of the last
cycle.

Draft proving
(pressure) switch
failed to close
within 5 seconds after
the inducer was
started.

Interrupt power to
reset. Heater had not
sensed the flame –
check gas supply and
igniter condition.

Test for defective
switch or a
pressurized room
condition that may be
forcing air through the
inducer.

Check the draft.
The low gas pressure
switch closes at 5.2 inches W.C.
may have remained open.
Verify the supply gas pressure
while the gas is flowing.

4 Flashes

6 Flashes

©2003

Open on high
temperature
limit switch
(ECO)

115-volt supply power
connection is
indicating reversed
polarity.

38

Check temperature
control operation.

Verify that a neutral-to-ground
check results
in “0” volts and a hot-to­ground check
results in 115-125 VAC.

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

LED INDICATORS ON HOT SURFACE IGNITION (HSI)

USING FLASHING RED LED ON HSI (HOT SURFACE IGNITION)

LED STATUS INDICATION ACTION TO BE TAKEN

7 Flashes

8 Flashes

Flame sensor reads a
low flame signal for
more than 4.25 sec.

No ignition sensed

Verify that the main
burner flame is in contact
with the flame.

Check wiring and
connection to HSI
assembly.

Clean the flame sensor
rod of soot or metal
flakes.

Check igniter for lack of
voltage, cracks, or lose
connection. [11-20 Ohms
at 77° F (25° C) is “good”]

Check ground
connection.

Continuous
Flash

Continuous
ON

Technical Training Department ©2003

Ashland City, Tennessee

Continuous flame
sensed for more than 5
seconds without gas
valve being energized

Internal control board
failure.

39

Check that the gas valve
is not failing to close at
the end of a heating
cycle.

Replace ignition control
board.

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

PART LOCATIONS ON SBN SERIES 120,000 - 390,000 BTU/H INPUT

MODELS 120 THROUGH 400/A

©2003

www.stateind.com

40

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

120 154 180 199 200(A)

Blower Assembly:

3 Blower ................................................. 194408 ......... 194408 .......... 194408 .......... 194408 ......... 194408

4 Outlet Assembly, Exhaust .................... 194424 ......... 194424.......... 194424 .......... 194424 ......... 194424

6 Burner, Orifice Bracket, Main ................ 98044 ........... 98044 ............ 98044 ............ 98044 ........... 98044

7 Burner, Orifice, Main (N) SBN............ 76243-32 ..... 76243-30 .......76243-33 ....... 76243-32 ..... 76243-32

8 Burner Assembly, Main (N) SBN .........194648 ......... 194648.......... 194648 .......... 194648 ......... 194648

9 Burner w/Igniter Bracket, Main BTN .... 194760 ......... 194760.......... 194760 .......... 194760 ......... 194760

11 Gasket, Cleanout ................................. 99038 ........... 99038 ............ 99038 ............ 99038 ........... 99038

14 Control, Ignition Assembly ..................194392 ......... 194392 .......... 194392 .......... 194392 ......... 194392

17 Cover, Control Box ............................... 194395 ......... 194395.......... 194395 .......... 194395 ......... 194395

18 Cover, Inner ....................................... 194388-4 ..... 194388-4 .......194388-4 ......... 194388 ......... 194388

19 Cover, Jacket ....................................... 194389 ......... 194389.......... 194389 .......... 194389 ......... 194389

22 Ignitor, Flame Sensor .......................... 194405 ......... 194405.......... 194405 .......... 194405 ......... 194405

23 Insulation, Top ..................................... 194439 ......... 194439 .......... 194439 .......... 194439 ......... 194439

*39 Manual, Instruction-SBN .....................194403 ......... 194403.......... 194403 .......... 194403 ......... 194403

40 Plate, Mounting ................................... 193439 ......... 193439 .......... 193439 .......... 193439 ......... 193439

41 Probe/ECO, Upper Thermostat ..........194396 ......... 194396.......... 194396 .......... 194396 ......... 194396

42 Probe/Lower Thermostat ....................194397 ......... 194397 .......... 194397 .......... 194397 ......... 194397

43 Rod, Anode ...................................... 180618-42 ... 180618-42 ..... 180618-42 ..... 180618-42 ... 180618-42

44 Switch, Blower Prover ....................... 194411-3 ......194411-7 ....... 194411-4 ....... 194411-3 ....... 194411

45 Switch, Low Gas Pressure ............... 191149-5 ......191149-5 ....... 191149-5 ....... 191149-5 ...... 191149-5

46 Switch, Off/On ......................................193243 ......... 193243.......... 193243 .......... 193243 ......... 193243

47 Thermostat, Digital .............................194393 ......... 194393 .......... 194393 .......... 194393 ......... 194393

48 Tube, Inlet .......................................... 192626-1 ..... 192626-1 .......192626-1 ....... 192626-1 ..... 192626-1

49 Tube, Outlet ....................................... 192627-1 ..... 192627-1 .......192627-1 ....... 192627-1 ..... 192627-1

51 Valve, Gas - Natural SBN .................. 194536-1 ..... 194536-1 ........ 194536 .......... 194536 ......... 194536

BTI Valve, Gas - Propane .................. 194536-3 ..... 194536-3 .......194536-3 ....... 194536-3 ..... 194536-3

52 Valve, T&P ............................................192467 ......... 192467 .......... 192467 .......... 192467 ......... 192467

*53 Wire Harness - Control Nat. Gas ........ 194545 ......... 194545.......... 194545 .......... 194545 ......... 194545

*54 Wire Harness - Power ........................ 194398 ......... 194398.......... 194398 .......... 194398 ......... 194398

*Items not illustrated.

Part numbers underlined are recommended stock items for emergency replacement (consider gas used in your area only).

Request from Parts Department by giving all information such as model and series number, type of gas and specifications.

Technical Training Department ©2003

Ashland City, Tennessee

41

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

Item 250(A) 275(A) 310(A) 366(A) 400(A)

Blower Assembly:

3 Blower ....................................... 194408 ........ 194408 ......... 194408 ........ 194408 ....... 194408

4 Outlet Assembly, Exhaust .................. 194424 ........ 194424 ......... 194424 ........ 194424 ....... 194424

6 Burner, Orifice Bracket, Main .............. 98044 .......... 98044 ........... 98044 .......... 98044 ......... 98044

7 Burner Orifice, Main (N) SBN .......... 76243-30 ..... 76243-33 ...... 76243-31 ..... 76243-30 .... 76243-29

8 Burner Assembly, Main SBN ............. 194648 ........ 194648 ......... 194648 ........ 194648 ....... 194648

9 Burner w/Igniter Bracket, Main SBN .. 194383........ 194383 ......... 194383 ........ 194383 ....... 194383

11 Gasket, Cleanout ............................... 99038 .......... 99038 ........... 99038 .......... 99038 ......... 99038

14 Control, Ignition Assembly ................ 194392 ........ 194392 ......... 194392 ........ 194392 ....... 194392

17 Cover, Control Box ............................. 194395........ 194395 ......... 194395 ........ 194395 ....... 194395

18 Cover, Inner SBN ............................ 194388-4 ..... 194388-4 ...... 194388-4 ...... 194388 ....... 194388

19 Cover, Jacket ..................................... 194389 ........ 194389 ......... 194389 ........ 194389 ....... 194389

*22 Igniter, Flame Sensor........................ 194405 ........ 194405 ......... 194405 ........ 194405 ....... 194405

23 Insulation, Top ................................... 194439........ 194439 ......... 194439 ........ 194439 ....... 194439

*39 Manual, Instruction SBN ................... 194403 ........ 194403 ......... 194403 ........ 194403 ....... 194403

40 Plate, Mounting ................................. 193243 ........ 193243 ......... 193243 ........ 193243 ....... 193243

41 Probe/ECO, Upper Thermostat ........ 194396 ........ 194396 ......... 194396 ........ 194396 ....... 194396

42 Probe/Lower Thermostat .................. 194397 ........ 194397 ......... 194397 ........ 194397 ....... 194397

43 Rod, Anode .................................... 180618-42 ... 180618-42 .... 180618-42 ...180618-42 .. 180618-42

44 Switch, Blower Prover SBN ............. 194411-3 ..... 194411-8...... 194411-2 ...... 194411....... 19441-3

45 Switch, Low Gas Pressure ............. 191149-5 ..... 191149-5...... 191149-5 ..... 191149-5 .... 191149-5

46 Switch, Off/On .................................... 193243 ........ 193243 ......... 193243 ........ 193243 ....... 193243

47 Thermostat, Digital ........................... 194393 ........ 194393 ......... 194393 ........ 194393 ....... 194393

48 Tube, Inlet ..................................... 192626-1 .....192626-1 ...... 192626-1 .....192626-1 .... 192626-1

51 Valve Gas - Natural SBN ................. 194536-1 .....194536-1 ........194536 ........ 194536 ....... 194536

52 Valve, T&P ....................................... 192467 ........ 192467 ......... 192467 ........ 192467 ....... 192467

*53 Wire Harness - Control Natural ........ 194545 ........ 194545 ......... 194545 ........ 194545 ....... 194545

Wire Harness - Control Propane ...... 194399 ........ 194399 ......... 194399 ........ 194399 ....... 194399

*54 Wire Harness - Power ...................... 194398 ........ 194398 ......... 194398 ........ 194398 ....... 194398

*Items not illustrated.

Part numbers underlined are recommended stock items for emergency replacement.

Request from Parts Department by giving all information

such as model and series number, type of gas and specifications.

©2003

42

High Altitude Main Burner Orifice

Table (NEO)

Model Orifice Drill Size

120 37
154 42
180 37
250 32
275 38
310 36
366 32
390 31

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

(

)

SERVICE HANDBOOK

GENERAL QUESTIONS AND ANSWERS

Q: What is the effect of the draft inducer?

A: The draft inducer has several effects:

• minimizes the excess air through the heater—this often reduces the required
vent size

• reduces draft through the heater when it is off

• replaces the draft hood of comparable products

• does not pressurize the vent—common “B” vent materials and the familiar fuel
gas codes for venting Category I, fan-assisted, products still apply. Do not
combine vent with products that do create a positive pressure vent (Category III
or IV).

SBN

Induced

Draft

Model Vent

120 5 120 5

154-390 6 154-275 6

BTR

Atmospheric

Mocels

305-390 8

Vent Dia.

inches

Q: What is the significance of low NOx (nitrogen oxide)? (SBN Models)

A: Currently, only Southern California and Texas have adopted rules to reduce the NOx
emissions under Rules 1121 and 1146.2, but more of California and Texas are expected
to implement this requirement in 2001. Ground-level ozone from man-made pollution is
a major ingredient in smog. NOx is a contributor to this ground-level ozone formation.
The boilers and water heaters affected by Rule 1121 and 1146.2 release about 14 tons
of NOx emissions into the air each day. By comparison, approximately the same quantity
of NOx is emitted by 288,000 typical passenger vehicles daily. It is estimated that a full
implementation of this emissions rule will reduce NOx by about 11 tons daily.
These emission requirements are expected to be implemented by other cities and
states soon. The rules apply to natural gas water heaters and boilers.

Technical Training Department ©2003

Ashland City, Tennessee

43

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

Q: When should anode rods, whic h pro vide additional protection against
corrosion, be replaced?

A: Anode rods should be replaced when large gouges or pits appear in the anodes. It
is recommended that anodes be inspected every six months.

Q: Does the inducer motor require oiling?

A: No.

Q: What size breaker should be used?

A: The heater should draw less then 5 amps and there is a 3-amp car-type fuse on the
control board. This fuse protects the boards.

©2003

44

Technical Training Department

Ashland City, Tennessee

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

)

SERVICE HANDBOOK

Electrical Information

Part Name Number Voltage Amperes

Integrated Water
Heater Control
(Temperature Control
Board)
Inducer (Blower) 194408-0 120 VAC 1.7
ECO (Part of Upper
Temperature Sensor) 194396
Main Gas Valve 24 VAC 1.5
Inducer (Blower) 194408

Igniter 194405 120 VAC 2
OPT Power Venter 120 VAC 14.5 FLA

194393-0

XFMER Secondary 24 V 1.5

Field Output 24 V 11.5

24 V - Opens at 203° ±

5.4°F Closes ± 193° F 0.3

120 VAC

2.2 FLA

3.5 LRA

26.0 LRA

Draft Proving (Pressure) Switch Table

Pressure Setting To

Close Switch (Inches

SBN Models Part No.

366 194411-0 (-) 1.60 ± .10"
275 194411-1 (-) 2.00" ± .10"
310 194411-2 (-) 1.75" ± .10"

120, 200, 250, 390 194411-3 (-) 2.40" ± .10"

154, 180, 199 194411-4 (-) 2.60" ± .10"

- 194411-5 (-) 2.50" ± .10"

W.C.

Technical Training Department ©2003

Ashland City, Tennessee

45

For Additional Information

Contact

State Water Heater Technical Information

At

1-800-365-0577

Prepared By The Training Department

In Ashland City , Tennessee

Website: www.statewaterheaters.com