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SUF Service Handbook
TABLE OF CONTENTS
STC-077
Introduction . . . . . . . . . . . . . . . . . . . 2
Troubleshooting (continued)
Blower . . . . . . . . . . . . . . . . . . . . . . . 25
Pressure Switch Performance . 26 – 27
120 VAC to Ignitor . . . . . . . . . . . . . . 28
Ignitor Resistance. . . . . . . . . . . . . . . 29
Gas Valve Test . . . . . . . . . . . . . . . . . 30
Gas Pressure Check . . . . . . . . . . . . 31
Installation
Clearances . . . . . . . . . . . . . . . . . . . . . 3
Gas Requirements . . . . . . . . . . . . . . . 3
Venting . . . . . . . . . . . . . . . . . . . . . 4 – 8
Air Requirements . . . . . . . . . . . . 9 – 11
Contaminated Air . . . . . . . . . . . . . . . 12
Flammable Items . . . . . . . . . . . . . . . 12
Multiple Unit Piping. . . . . . . . . . . . . . 13
Condensation . . . . . . . . . . . . . . . . . . 14
Component Information
Orifice Tables . . . . . . . . . . . . . . . . . . 32
Pressure Switches . . . . . . . . . . 33 – 34
Operation
Wiring Diagrams . . . . . . . . . . . . . . 35
Sequence of Operation . . . . . . . . . . 15
Controls . . . . . . . . . . . . . . . . . . . . . . 16
Circuit Boards. . . . . . . . . . . . . . . . . . 17
Service Aids . . . . . . . . . . . . . . . . . . 36
SUF Muffler . . . . . . . . . . . . . . . . . . . 37
Questions & Answers . . . . . . . . . . 38
Error Codes. . . . . . . . . . . . . . . . . . . 39
Service Checklist . . . . . . . . . . . . . . 40
Parts Lists
Troubleshooting
Pre-Service. . . . . . . . . . . . . . . . . . . . 18
120 VAC to Control. . . . . . . . . . . . . . 18
Transformer . . . . . . . . . . . . . . . 19 – 20
ECO Check . . . . . . . . . . . . . . . 21 – 22
Temperature Probe. . . . . . . . . . . . . . 23
Pressure Switch Continuity . . . . . . . 24
Models 100 – 150, 100 – 199,
and 100 – 240 . . . . . . . . . . . 41 – 43
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S U F
S E R V I C E
H A N D B O O K
I N T R O D U C T I O N
INTRODUCTION
This service handbook is designed to aid in servicing and troubleshooting State SUF 150, 199 and 240 water heaters.
No duplication or reproduction of this book may be made without the express written authorization of the State Water
Heaters Company.
The following text and illustrations will provide you with a step by step procedure to verify proper installation, operation
and troubleshooting procedures. Additional quick reference data is included to assist you in servicing this product.
The information contained in this handbook is designed to answer commonly faced situations encountered in the oper-
ation of the SUF product line and is not meant to be all inclusive. If you are experiencing a problem not covered in this
handbook, please contact the State Technical Information Department at 1-800-365-0577 or your local State Represen-
tative for further assistance. This handbook is intended for use by licensed plumbing professionals and reference
should be made to the instruction manual accompanying the product. This handbook contains supplemental informa-
tion to the SUF instruction manual.
Qualifications: Installation or service of this water heater requires ability equivalent to that of a licensed tradesman in
the field involved. Plumbing, venting, gas supply and electrical testing skills are required.
Tools Required:
• Phillips head and flat tip screw drivers
• Set of marked drill bits
• Electric multimeter tester
• Gas pressure gauge or manometer (gauge — part number 8099-2)
• Water pressure gauge (part number 4798)
• Digital manometer or draft gauge
• Thermometer (part number 4870 — range 0 thru 220°F)
1
1
•
/2”, 1” and 1 /8” sockets
• Pipe wrench for union disconnect
NOTE Also, have a copy of the instruction manual for the model and series SUF that you are servicing.
Technical Training Department
STC-077
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S U F
S E R V I C E
H A N D B O O K
I N S T A L L A T I O N
INSTALLATION
CLEARANCES
This portion of the handbook will review
often overlooked installation require-
ments. The installation manual covers
these items in detail. SUF water heaters
are approved for installation on com-
bustible flooring. The minimum clear-
ance to combustibles or non-
combustibles is 0 inches from the sides
and rear, 0 inches from vent piping, and
1.5 inches from the top cover. A 24 inch
clearance for all serviceable parts is
recommended. Clearances may vary
between SUF models. See installation
manual or the label on the heater for
your specific model.
GAS REQUIREMENTS
N O T E : Pressure without capacity will result in lockout. Follow the piping guidelines in the
installation manual. The supply gas pressure is normally measured at the dirt leg or at the inlet gas
pressure tap on the gas valve. This reading must be measured with ‘flowing’ gas.
The manifold gas pressure is measured at the manifold pressure tap on the gas valve when the
gas is flowing. The gas valves used on all SUF water heaters are 24 VAC combination step open-
ing gas valves. They incorporate the main valve and pressure regulator into one body.
REGULATED GAS SUPPLY LINE
PRESSURE REGULATOR
ADJUSTMENT
(COVER SCREW)
GAS VALVE ON/OFF
MAIN GAS
SHUTOFF VALVE
TH & TR TERMINALS
(MAIN VALVE)
INLET PRESSURE
TAP
DIRT LEG TEE
PIPE CAP
MANIFOLD
PRESSURE TAP
GAS INLET
GAS OUTLET
SUF 240
SUF 150 & 199
SUF 150 & 199
PROPANE GAS
GAS SUPPLY SPECIFICATIONS
NATURAL GAS
NATURAL GAS
12.0 (3 kPa)
7.0 (1.75 kPa)
5.5 (1.37 kPa)
4.0 (1 kPa)
12.0 (3 kPa)
7.0 (1.75 kPa)
4.5 (1.12 kPa)
3.5 (0.8 kPa)
14.0 (3.45 kPa)
11.0 (2.74 kPa)
11.0 (2.74 kPa)
10.0 (2.5 kPa)
Max
. Gas Supply Pressure Inches W.C.
Inches
Nominal Gas Supply Pressure
Minimal Gas Supply Pressure
W.C.
W.C.
Inches
Inches
Manifold Pressure
W.C.
State Water Heaters
Ashland City, Tennessee © 2004
Technical Training Department
STC-077
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S U F
S E R V I C E
H A N D B O O K
I N S T A L L A T I O N
VENTING
Equivalent Feet of Pipe Intake or Exhaust
VENT LENGTH TABLE
NUMBER OF 90°
ELBOWS
3” MINIMUM
PIPE (FEET)
3” MAXIMUM
PIPE (FEET)
4” MAXIMUM
PIPE (FEET)
7
7
7
7
7
7
45
40
35
30
--
115
110
105
100
95
ONE (1)
TWO (2)
THREE (3)
FOUR (4)
FIVE (5)
SIX (6)
--
90
4-inch PVC may be used for a MAXIMUM intake of ONE HUNDRED TWENTY (120) EQUIVALENT
FEET and a MAXIMUM exhaust of ONE HUNDRED TWENTY (120) EQUIVALENT FEET. The
maximum number of 90° elbows with the 4-inch venting is six (6) on the intake and six (6) on the
exhaust. A 90° elbow is equal to five (5) equivalent feet of pipe. One (1) 90° elbow is equal to two
(2) 45° elbows. Any venting configuration using less than 50 equivalent feet should use 3-inch vent-
ing. See Vent Length Table.
The 3-inch venting terminals (provided) must be used with the 4-inch venting by adding 4 x 3
reducing coupling at the venting terminals. A reducing coupling is also needed immediately after
the condensate elbow (exhaust) and immediately before the 3-inch blower adapter (intake) if direct
venting is installed. See Vent Length Table.
DIRECT VENTING
The air intake provided on the unit contains a mesh screen (see Figure below) to prevent large par-
ticles from entering the unit.
3” (7.6CM) 45° PVC ELBOW WITH MESH SCREEN
WARNING WHEN THE UNIT IS TO
BE SETUP AS A DIRECT VENT, THE
MESH SCREEN MUST BE REMOVED.
THE INLET VENT PIPE MAY THEN BE
GLUED TO THE AIR INTAKE (see follow-
ing Figure) PROVIDED ON THE UNIT.
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STC-077
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S U F
S E R V I C E
H A N D B O O K
I N S T A L L A T I O N
VENTING CONFIGURATIONS
SEALED DIRECT
VENT SIDEWALL
INDOOR CONVENTIONAL
VERTICAL
INDOOR CONVENTIONAL
SIDEWALL
SEALED DIRECT
VENT VERTICAL
SEALED DIRECT VENT
HORIZONTAL INTAKE
VERTICAL EXHAUST
SEALED DIRECT VENT
VERTICAL INTAKE
HORIZONTAL EXHAUST
SEALED DIRECT VENT
W/ CONCENTRIC VENT
VERTICAL TERMINA-
SEALED DIRECT VENT
W/ CONCENTRIC VENT
HORIZONTAL TERMINATION
VENTING MATERIALS
This unit can be vented using only PVC (Class 160, ASTM D-2241; Schedule 40, ASTM D-1785; or
Cellular Core Schedule 40 DWV, ASTM F-891), Schedule 40 CPVC (ATSM F-411), or ABS (ASTM
D-2661) pipe. The fittings, other than the TERMINATIONS should be equivalent to PVC-DWV fit-
tings meeting ASTM D-2665 (Use CPVC fittings, ASTM F-438 for CPVC pipe and ABS fittings,
ASTM D-2661/3311 for ABS pipe. If CPVC or ABS pipe and fittings are used, then the proper
cement must be used for all joints, including joining the pipe to the Termination Tee (PVC Material).
PVC Materials should use ASTM D-2564 Grade Cement; CPVC Material should use ASTM F-493
Grade Cement and; ABS Materials should use ASTM D-2235 Grade Cement.
For water heaters in locations with high ambient temperatures (above 100°F) and/or insufficient
dilution air, it is recommended that CPVC or ABS pipe and fittings (MUST USE SUPPLIED VENT
TERMINAL) be used.
State Water Heaters
Ashland City, Tennessee © 2004
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S U F
S E R V I C E
H A N D B O O K
I N S T A L L A T I O N
CONCENTRIC VENT TERMINATION
The concentric vent termination kit, Part No. 9003910005 can be used on SUF 150 – 240 Ultra
Force water heaters. It adds zero equivalent feet to the vent system. Below are some general appli-
cation and installation guidelines for the concentric vent kit. Refer to the accompanying literature
and the water heater installation manual for complete venting installation instructions.
This concentric vent termination kit may be used with 3 or 4 in. diameter pipe systems. When con-
necting to a 4 in. diameter pipe system a 3 x 4 in. field supplied reducer is to be installed at the
intake and exhaust connection of the concentric vent termination kit. See water heater installation
and operation manual for venting specification
1
1
Dimension 21 /8 in. may be lengthened to 60 in. maximum. Dimension 21 /8 in. may also be short-
ened by cutting the pipes, provided in the kit, to 12 in. minimum. Dimension 39 will change accord-
1
ingly as dimension 21 /8 in. is lengthened or shortened
Horizontal
Installation
Vertical Installation
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S U F
S E R V I C E
H A N D B O O K
I N S T A L L A T I O N
VENTING CLEARANCES
This illustrates the exterior clearances for these SUF units when installed as direct vent heaters.
N O T E : 24 inches between inlet and outlet is a MINIMUM. Greater distance is recommended.
In colder climates increasing the 24” minimum to a maximum practical distance will reduce the
possibility of frost over from side winds blowing exhaust vapors into the air intake.
SUF MODEL 150 – 199
SUF MODEL 240
State Water Heaters
Ashland City, Tennessee © 2004
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S U F
S E R V I C E
H A N D B O O K
I N S T A L L A T I O N
EXTERIOR SIDEWALL CLEARANCES
Horizontal Vent (Using Room Air for Combustion)
Horizontal Direct Vent (Using Outdoor Air for Combustion)
When multiple units are directly vented through a wall, all intake vent terminals must be no lower
than the highest exhaust vent terminal.
CAUTION DO NOT TERMINATE THE VENTING WHERE NOISE FROM THE EX-
HAUST OR INTAKE WILL BE OBJECTIONABLE. THIS INCLUDES LOCATION CLOSE TO
OR ACROSS FROM WINDOWS AND DOORS. AVOID ANCHORING THE VENT AND
INTAKE PIPES DIRECTLY TO FRAMED WALLS, FLOORS OR CEILINGS UNLESS RUB-
BER ISOLATION PIPE HANGERS ARE USED. THIS PREVENTS ANY VIBRATIONS
FROM BEING TRANSMITTED INTO THE LIVING SPACES.
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STC-077
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S U F
S E R V I C E
H A N D B O O K
I N S T A L L A T I O N
AIR REQUIREMENTS
MINIMUM AIR FOR COMBUSTION
10 Cubic Feet of Air Per 1000 BTUH
Stoichiometric or theoretical complete combustion requires 10 cubic feet of air per 1000 BTUH of
gas input. The National Fuel Gas Code also recommends an additional 2.5 cu.ft. of “excess air”.
This 12.5 cu.ft. minimum supply air per 1000 BTUH input applies to natural and propane gas mod-
els.
The National Fuel Code also specifies minimum make-up air opening sizes for various building
installations (Ref: NFPA 54, ANSI Z223.1, sec 5.3).
MAKE-UP AIR
Direct Vent Installation
This model is approved for direct venting either horizontally or vertically or conventional venting
horizontal or vertical. Direct venting avoids using room air for combustion and eliminates the need
for additional air intake ducts.
State Water Heaters
Ashland City, Tennessee © 2004
Technical Training Department
STC-077
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S U F
S E R V I C E
H A N D B O O K
I N S T A L L A T I O N
MAKE-UP AIR
Direct Communication
A fresh supply of make-up air for combustion can be supplied to the heater through make-up air
openings, which directly communicate with the out of doors. 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 shall have a free area of not less than 1 square inch per 4000 BTUH of the total input
of all appliances within the enclosure.
The lower opening is primarily providing combustion air. The upper opening is providing vent dilu-
tion air and acts as a relief opening for flue gases should the vent become obstructed or a down
draft condition occur.
MAKE-UP AIR
Vertical Ducts
Often it is more practical to install vertical make-up air ducts to the outdoors. Again, two openings
are required — within 12 inches (30 cm) of the top of the enclosure and one within 12 inches (30
cm) of the bottom of the enclosure. Each opening shall have a free area of not less than 1 square
inch per 4000 BTUH of the total input of all appliances within the enclosure.
Technical Training Department
STC-077
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S U F
S E R V I C E
H A N D B O O K
I N S T A L L A T I O N
MAKE-UP AIR
Horizontal Ducts
When the heater is installed in an interior room with no roof access for vertical ducts, horizontal
make-up ducts should be installed. When using horizontal ducts, two openings are required —
within 12 inches (30 cm) of the top of the enclosure and one within 12 inches (30 cm) of the bottom
of the enclosure. Each opening shall have a free area of not less than 1 square inch per 2000
BTUH of the total input of all appliances within the enclosure.
INSUFFICIENT MAKE-UP AIR
Backdraft
Insufficient make-up air is a major cause of combustion problems. One common example is in a
restaurant installation where exhaust vent equipment was not considered in sizing make-up air
requirements. This may result in air being backdrafted by the restaurant exhaust equipment
through the heater causing flue gas spillage, flame roll out, improper combustion, inconsistent pilot
operation, and/or erratic heater shutdown.
A possible solution to this situation would be to use a SUF with direct venting.
A less common service issue associated with a backdraft or negative pressure room would be the
opening or closing of air pressure switches. This may result in erratic or no heater operation.
State Water Heaters
Ashland City, Tennessee © 2004
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S U F
S E R V I C E
H A N D B O O K
I N S T A L L A T I O N
CONTAMINATED AIR
RUST
=
CHIPS
Along with adequate make-up air, the quality of the air is important. Contaminants in combustion air
can lead to premature heater failure. Vapors from bleaches, soaps, salts, etc. are drawn into the
combustion chamber with the make-up air and, once fired, mix with water vapor in the gasses to
form extremely corrosive hydrochloric or hydrofluoric acid and other corrosive by-products. Dust
drawn in may build up on the blower or clog the main burner ports. Also, be certain to examine the
exterior area around the air intake of a direct vent installation for the contaminants.
FLAMMABLE ITEMS
Flammable items or 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 or in the area of the exterior air intake of a direct vent
installation. Direct venting does not eliminate the need to remove flammable or corrosives from the
area surrounding the heater.
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S U F
S E R V I C E
H A N D B O O K
I N S T A L L A T I O N
MULTIPLE UNIT — WATER PIPING
NOTES APPLY TO ALL SYSTEMS:
*ADD GATE VALVES TO INLET AND OUTLET OF EACH
UNIT FOR ISOLATION FLEXIBILITY. LOCATE AT THE
SAME POINT FROM TEE.
** ADD THERMAL EXPANSION TANK TO COLD WATER
SUPPLY IF NECESSARY.
CONDENSATION HOSE MUST BE ALLOWED TO DRAIN.
NOTE: T&P VALVES MUST BE PIPED TO OPEN DRAIN OR
PER LOCAL CODE
State Water Heaters
Ashland City, Tennessee © 2004
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S U F
S E R V I C E
H A N D B O O K
I N S T A L L A T I O N
CONDENSATION
The average dewpoint of natural gas flue products is 127° F. Propane flue products is 119° F. With
70° F ambient air temperature and 180° F stored water temperature, exhaust gas will be approxi-
mately 140° F. Recommended starting point for water storage is 120° F.
The extra high thermal efficiency of the SUF will result in condensation in the flue passage. The fol-
lowing answers common questions about this condensation.
CAN I DRAIN THIS CONDENSATION TO A FLOOR DRAIN? The “Corrosion Resistance of Cast
Iron Soil Pipe” by the Ductile Metals Association (formally the Cast Iron Soil Pipe Institute) states
that:
“Internal corrosion of cast iron soil pipe and fittings can be caused by strong acids or other reagents
having an acidity of pH 4.3 or less if allowed to contact cast iron pipe for an extended period of time
without sufficient dilution to raise the pH valve about 4.3. By avoiding low pH discharges, internal
corrosion problems can be limited or eliminated, assuring the owner many years of service.”
WHAT ABOUT THE pH VALUES OF CONDENSATE AND SODA POP? The pH of the SUF con-
densate average 4.5 which is approximately 4 times less concentrated than the limit of 4.3 recom-
mended by the DMA. Any water flow in the drain rapidly dilutes the condensate even more. A can
of leading carbonated cola drink measured a pH of 2.5 which is 300 times more concentrated than
the SUF condensate.
WHAT DOES THE pH SCALE MEAN? The pH value is a measure of acidity of alkalinity. A pH of
7 is neutral. Numbers from 7 to 1 indicate increasing acidity and numbers from 7 to 14 indicate
increasing alkalinity. The pH scale is similar to the Richter scale used to measure earthquakes.
Each number indicates a change of 10 times the concentration of the previous value. A pH 6 is 10
times more concentrated than a pH 7, a pH 5 is (10x10) 100 times pH 7 and pH 4 is (10x10x10)
1,000 times pH 7, etc.
WHAT ABOUT CONDENSATE NEUTRALIZERS? Condensate neutralizers are usually not nec-
essary. A condensate neutralizer is easy to make by filling a short length of 2” or 3” PVC pipe with
landscape marble chips, capping it and installing it in series with the condensate drain of the equip-
ment. Most commercial neutralizers are off the market because of poor demand for the product.
Condensation from the exhaust vent piping and tank internal flue way must be allowed to drain. A
“blocked flue” indication will often be your first indication that condensate is not draining.
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STC-077
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S U F
S E R V I C E
H A N D B O O K
O P E R A T I O N
OPERATION
SEQUENCE OF OPERATION
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S U F
S E R V I C E
H A N D B O O K
O P E R A T I O N
CONTROLS
NORMAL INDICATIONS / READINGS / SETTINGS
During Call for Heat
• On/Off switch in the “on” position
DISPLAY PANEL (CONTROL PANEL)
• Water Temperature F° — current average
tank water temperature displayed
• 120 VAC LED light on
• 24 VAC LED light on
• High Limit/Vent Switch LED light on
• Blower (while blower is running) LED light
on
• Air Pressure Switch (while blower is
running) LED light on
• Control Status LED light on
• Gas Valve (during ignition period and
heating cycle) LED light on
The water temperature inside the tank must be below the current temperature setting to activate a
call for heat. Pressing the Set/Reset button approximately 4 – 6 seconds after powering up the
water heater will reveal the current temperature setting. See the instructions below for how to view
or change temperature settings.
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S U F
S E R V I C E
H A N D B O O K
O P E R A T I O N
CIRCUT BOARDS
DISPLAY CIRCUIT BOARD
IGNITION CIRCUIT BOARD
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STC-077
S U F
S E R V I C E
H A N D B O O K
T R O U B L E S H O O T I N G
TROUBLESHOOTING
PRE-SERVICE TIPS
CHECK THAT:
• Insure 120 VAC power supply has correct polarity — check neutral
(white) wire to ground with volt meter. It should read “0” volts.
• Tank is full of water
• Exhaust and intake vent do not exceed allowable limits
• All plugs into boards are secure
• Condensate hose is drained and open
• Proper (natural or propane) gas is supplied
SUF SERVICE HANDBOOK
120 VAC TO CONTROL
STEP 1 120 VAC TO CONTROL BOARD
STEP 1: CHECK FOR 120 VAC TO CONTROL BOARD CN1 TERMINAL.
Condition:
• Disconnect plug from CN1 terminal.
• On/Off switch is on.
Check for 120 VAC black wire terminal white wire on plug.
IF…
THEN
check On/Off switch, turn switch on, replace On/Off switch if defective, restore
power to the water heater.
120 VAC is not present
120 VAC is present
reconnect CN1 plug, continue to Step 2.
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S U F
S E R V I C E
H A N D B O O K
T R O U B L E S H O O T I N G
TRANSFORMER
STEP 2 120 VAC TO TRANSFORMER
STEP 2: CHECK FOR 120 VAC TO TRANSFORMER FROM PIN 1 AND 2 ON CONTROL
BOARD CN4 TERMINAL.
Condition:
• Disconnect CN4 plug from control board.
• On/Off switch is on.
Check for 120 VAC between pin 1 and 2 at CN4 on the control board as illustrated above. Perform
this test with the CN4 plug disconnected and the On/Off switch turned on.
IF…
THEN
check CN1 plug connection
replace control board if Step 1 has been performed and results were successful.
120 VAC is not present
120 VAC is present
reconnect CN4 plug to control board, continue to Step 3.
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S U F
S E R V I C E
H A N D B O O K
T R O U B L E S H O O T I N G
TRANSFORMER (CONTINUED)
STEP 3 24 VAC FROM TRANSFORMER
STEP 3: CHECK FOR 24 VAC AT TRANSFORMER CN4 PLUG ON CONTROL BOARD.
Condition:
• CN4 is plugged into control board.
• On/Off switch is on.
Insert meter probes into back of CN4 plug on pins 3 and 4 (blue and yellow wires) with CN4
plugged in and power on.
IF…
THEN
24 VAC is not present
24 VAC is present
replace transformer if Steps 1 and 2 were performed and results were successful.
continue to Step 4.
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S U F
S E R V I C E
H A N D B O O K
T R O U B L E S H O O T I N G
ECO CHECK
STEP 4 24 VAC TO ECO
STEP 4: CHECK FOR 24 VAC BETWEEN PIN 4 ON CONTROL BOARD TERMINAL CN3 AND
GROUND.
Condition:
• Disconnect CN3 plug from control board.
• On/Off switch is on.
Check for 24 VAC between pin 4 of the CN3 terminal on the control board and ground.
IF…
THEN
replace the control board if Steps 1, 2, and 3 have been performed and the results
were successful.
24 VAC is not present
24 VAC is present
continue to Step 5.
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S U F
S E R V I C E
H A N D B O O K
T R O U B L E S H O O T I N G
ECO CHECK (CONTINUED)
STEP 5 24 VAC FROM ECO
STEP 5: CHECK FOR 24 VAC BETWEEN PIN 1 ON CN3 PLUG AND GROUND.
Condition:
• Reconnect CN3 plug to control board.
• On/Off switch is on.
Insert one meter probe into the back of CN3 plug pin 1, check for 24 VAC between here and ground
with CN3 plugged in and power on. (See illustration above for pin number locations.)
IF…
THEN
make sure water temperature in tank is below 160° F, press Set/Reset button on
display panel, replace upper temperature/ECO probe if tank water temperature is
below 160 and Step 4 has been performed and results were successful.
24 VAC is not present
24 VAC is present
continue to Step 6.
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TEMPERATURE PROBE
STEP 6 TEMPERATURE PROBE RESISTANCE
UPPER
LOWER
TEMPERATURE
PROBE PLUG
TEMPERATURE
PROBE PLUG
STEP 6: CHECK RESISTANCE OF THERMISTOR IN UPPER AND LOWER TEMPERATURE
PROBES.
Condition:
• Disconnect CN3 and CN8 plugs from control board.
• On/Off switch is off.
• Multimeter is set to lowest ohms scale above expected resistance.
Check resistance between black wire connects on CN3 and CN8 plugs as shown in illustration
above.
IF…
THEN
ohm reading does not approximately correspond to table at given replace temperature probe if thermistor is open.
temperatures
shorted, or resistance value is off significantly.
continue to Step 7.
ohm reading does approximately correspond to table at given
temperatures
NOTE: The upper and lower temperature probes contain
thermistors which are heat sensitive resistors. The control
board interprets changes in thermistor resistance as
changes in water temperature.
WATER TEMP
OHMS RESISTANCE
°C
°F
3
21
40
70
26,435
11,974
These thermistors are very reliable and should only be
replaced when:
37.5
49
100
120
5,862
3,780
The resistance test indicates an “open” (infinite resistance)
or a “direct short” (no resistance) circuit.
54.5
60
130
140
3,066
2,503
The nature of the service problem is temperature control
and the resistance readings are significantly off when com-
pared to the values in the table here at the given tempera-
ture.
71
82
160
180
1,698
1,177
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PRESSURE SWITCH CONTINUITY
STEP 7 PRESSURE SWITCH CONTINUITY TEST
STEP 7: CHECK FOR CONTINUITY BETWEEN PRESSURE SWITCH TERMINALS WITH
WIRES REMOVED.
Condition:
• On/Off switch is off.
• All wires are disconnected from all pressure switches.
• Multimeter is set to lowest ohms scale.
IF…
THEN
blocked inlet switch does not show continuity
blocked inlet switch does show continuity
blower proving switch does show continuity
blower proving switch does not show continuity
replace switch.
continue.
replace switch.
continue.
check for minimum supply gas
pressure of
5.0” W.C. natural gas
9.0” W.C. LP gas
low gas pressure switch does not show continuity
replace switch if gas pressures
are above these minimums.
low gas pressure switch does show continuity
continue.
blocked outlet pressure switch does not show continuity
replace switch.
reconnect all wires to pressure
switches; continue to Step 8.
blocked outlet pressure switch does show continuity
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BLOWER
STEP 8
120 VAC TO BLOWER
STEP 8: CHECK FOR 120 VAC TO BLOWER FROM CN2 PLUG PIN 1 AND 2.
Condition:
• Reconnect all plugs to control board.
• On/Off switch is on.
• Call for heat is activated.
Insert meter probes into back of CN2 plug on pins 1 and 2 with CN2 plugged in, power on, and a
call for heat activated.
IF…
AND
THEN
120 VAC is not
present
replace the control board if call for heat is active and Step 7 has been
performed and results were successful — continue to Step 9A.
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PRESSURE SWITCH PERFORMANCE
STEP 9A TAKE AIR AND GAS PRESSURE READINGS.
Blower prover and blocked outlet pressure
Blower inlet pressure
STEP 9A: CHECK PRESSURE AT SENSING PORTS ON BURNER, BLOWER INLET AND GAS
VALVE.
Condition:
• All wires are reconnected to all pressure switches.
• On/Off switch is on.
• Call for heat is activated.
• Blower is running during trial for ignition.
Remove the air pressure sensing tubes from the sensing ports on the blower inlet and the burner.
Using a digital manometer take a pressure reading with the blower running during a call for heat at
both of these sensing ports. Take a supply gas pressure reading on the inlet side of the gas valve
as outlined in Step 13.
Record all 3 pressure readings and have them on hand. Continue to Step 9B.
AMBIENT ROOM AIR PRESSURE
N O T E : One side of the internal diaphragms on these pressure switches are vented to the
room atmosphere. Due to this construction a negative or positive room air pressure can cause
erratic switch operation and the water heater to shut down. If you suspect a pressure imbalance
between the equipment room and the outdoor atmosphere, “zero” or calibrate your digital
manometer to the equipment room ambient air pressure. With the manometer still on and
calibrated to the equipment room air pressure take the manometer outdoors. If the pressure
reading changes significantly you may have a pressure imbalance between the equipment room
and the outdoor atmosphere. This pressure imbalance may need to be corrected before the water
heater will operate properly.
Insure the combustion/make-up air openings into the equipment room are properly sized. Check for
leaks in ductwork on any nearby air handling equipment. If there is a kitchen vent hood installed in
the building, insure it is properly balanced. Missing or worn fan belts on make up air fans to vent
hoods can cause negative air pressure throughout the building.
Direct vent installations DO NOT eliminate this potential problem.
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PRESSURE SWITCH PERFORMANCE (CONTINUED)
STEP 9B PRESSURE SWITCH CONTINUITY TEST — OPERATIONAL
SUF 240
ONLY
Air pressure switches
Low gas pressure switch
STEP 9B: CHECK FOR CONTINUITY BETWEEN PRESSURE SWITCH TERMINALS WITH
WIRES REMOVED AND BLOWER RUNNING.
Condition:
• All wires are disconnected from all pressure switches — ends are taped off.
• On/Off switch is on.
• Call for heat is activated.
• Blower is running during trial for ignition.
• Multimeter is set to lowest ohms scale.
The wires disconnected are energized with 24 VAC from the control board. Do not allow these
wires to touch ground — use electrical tape to insulate wire connects during this test.
Check for continuity with an ohm meter between terminals on all pressure switches with the wires
removed and the blower running during a trial for ignition. Restart the water heater as needed.
The pressure switches are wired together in a “series” circuit. For the water heater to continue to
fire and satisfy a call for heat the control board must sense a closed pressure switch circuit.
IF…
THEN
continuity is not present between terminals on
one or more pressure switches — the switch
contacts are open.
if the pressure recorded in Step 9A is within the value shown in
the table for the switch contacts to remain closed — replace the
pressure switch.
compare the pressure reading recorded in Step
9A to the value given for that switch in the table
on page 34.
if the pressure recorded in Step 9A is not within the value shown
in the table for the switch contacts to remain closed — check for/
clear any restrictions in the vent and/or air intake piping, check
for an excessive number of elbows or equivalent feet of pipe
used in the vent and/or air intake piping.
compare to value for correct Model and Series
number in table.
check for/restore minimum supply gas pressure — Step13.
continue to Step 10.
continuity is present.
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120 VAC TO IGNITOR
STEP 10
120 VAC TO IGNITOR
STEP 10: CHECK FOR 120 VAC TO IGNITOR FROM PIN 1 AND 2 ON CONTROL BOARD
TERMINAL CN5.
Condition:
• Disconnect CN5 plug from control board.
• On/Off switch is on.
• Call for heat is activated.
• Perform test during ignitor warm up period.
IF...
THEN
replace the control board if Steps 7 through 9B have
been performed and results were successful.
120 VAC is not present
120 VAC is present
continue to step 11.
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IGNITOR RESISTANCE
STEP 11
IGNITOR RESISTANCE CHECK
STEP 11: CHECK RESISTANCE BETWEEN TWO WIRE CONNECTS AT CN5 IGNITOR PLUG
END.
Condition:
• On/Off switch is off.
• Disconnect CN5 ignitor plug from circuit board.
• Multimeter is set to lowest ohms scale above 300 ohms.
IF…
THEN
replace the ignitor.
ohms reading taken is not between 50 – 300 ohms
ohms reading taken is between 50 – 300 ohms
reconnect CN5 plug, continue to Step 12.
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GAS VALVE TEST
STEP 12
24 VAC TO GAS VALVE
SUF 240 ONLY
STEP 12: CHECK FOR 24 VAC TO GAS VALVE DURING TRIAL FOR IGNITION.
Condition:
• All wires are reconnected.
• On/Off switch is on.
• Call for heat is activated.
• Perform test at end of ignitor warm up period.
Touch meter probes to wiring terminals on gas valve with wires from control board still connected
during the ignitor warm up period.
IF…
AND
THEN
replace control board if Step 9A and 9B have
been performed and results were successful.
24 VAC is not present to gas valve
24 VAC is present
gas does not flow to burner check for/restore supply gas;
check for/clear any restriction in the gas train;
replace the gas valve if the valve will not open
with 24 VAC applied.
24 VAC is present
gas does flow to burner
continue to Step 13.
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GAS PRESSURE CHECK
STEP 13 SUPPLY GAS PRESSURE TEST
SUF 150, 199
Propane
SUF 150, 199
Natural
SUF 240 Natural
Gas Valve
Gas Valve
STEP 13: CHECK AND ADJUST SUPPLY GAS PRESSURE.
Attach manometer or gas pressure gauge to pressure tap on gas valve or use adapter to check
pressure ahead of valve as near as possible to valve. All appliances being served by this gas sup-
ply line should be operating.
IF...
THEN
supply gas pressure is not between 5.0 and 14” W.C.
natural gas or 11.0 and 14” W.C. propane
adjust supply gas pressure (Recommended supply
minimum is 7.0” W.C. for natural gas models)
proper supply gas pressure is present
continue to Step 14.
STEP 14 MANIFOLD GAS PRESSURE TEST
STEP 14: CHECK AND ADJUST MANIFOLD GAS PRESSURE.
IF...
THEN
manifold gas pressure is not:
natural gas models
adjust manifold gas pressure to values given for model
and fuel type (within 0.3” W.C. tolerance)
if manifold gas pressure cannot be adjusted to
maintain values given (within 0.3” W.C. tolerance)
replace gas valve.
3.5” W.C. ± 0.3” – SUF 155 & 199
4.0” W.C. ± 0.3” – SUF 240
propane gas models
10.0” W.C. ± 0.3” – all propane gas models.
manifold gas pressure is within tolerances given above
ignition should occur.
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H A N D B O O K
C O M P O N E N T
I N F O R M A T I O N
COMPONENT INFORMATION
FLAME SENSING ROD
PART NUMBER
192478
FLAME SENSING CURRENT
COMMENTS
SUF 150, 199, & 240
0.7 Micro Amp (µ)
HOT SURFACE IGNITOR (HSI)
PART NUMBER
VOLTAGE
120 VAC
AMP
OHMS COLD
COMMENTS
192638
1.0
50 – 300
SUF 150, 199, & 240
ORIFICE TABLE
ORIFICE TABLE
MAIN BURNER
ORIFICE NO.
MAIN ORIFICE SIZE
INCHES
AIR ORIFICES
PT. NO.
AIR ORIFICE
SIZE — INCHES
SUF MODEL
150
199
192477-1
192477-0
192477-2
192477-5
192477-4
0.235
0.304
0.360
0.141”
0.166”
192450-1
192450-0
192450-2
192450-5*
192450-4*
0.875
1.031
1.196
0.872
1.150
240
150 Prop
199 Prop
* -4 and -5 stamped with “P” for Propane
N O T E : Hex head of main burner orifice is upstream end — gas flows out of tapered end.
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H A N D B O O K
C O M P O N E N T
I N F O R M A T I O N
PRESSURE SWTCHES
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C O M P O N E N T
I N F O R M A T I O N
PRESSURE SWITCHES (CONTINUED)
PRESSURE SWITCHES
†
PART NUMBER / ACTIVATION PRESSURE
Model
Blocked Inlet
Normally Closed
Opens on a fall
Blower Prover
Normally Open
Closes on a rise
Low Gas Pressure
Normally Open
Closes on a rise
Blocked Outlet
Normally Closed
Opens on a rise
SUF 150
193363-000 / -0.76”
193355-000 / -1.80”
193355-000 / -1.80”
193363-000 / -0.76”
193356-000 / -2.00”
193356-000 / -2.00”
193361-000 / -0.77”
194706-000 / +1.00”
194706-000 / +1.00”
194706-000 / +1.00”
194706-000 / +1.00”
194706-000 / +1.00”
194706-000 / +1.00”
194706-000 / +1.00”
N/A
193362-000 / +2.60”
193357-000 / +4.00”
193357-000 / +4.00”
193364-000 / +2.87”
193357-000 / +4.00”
193357-000 / +4.00”
193357-000 / +4.00”
N/A
N/A
SUF 199
N/A
N/A
N/A
SUF 240
191149-005 / +5.20”
†. Pressure values are given in inches of water column pressure (“W.C.).
Negative pressure values in this table are preceded by a “-” minus sign and indicate pressure below
atmospheric; in a vacuum. Positive pressures are preceded by a “+” plus sign and indicate pressure above
atmospheric.
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H A N D B O O K
W I R I N G D I A G R A M S
WIRING DIAGRAMS
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H A N D B O O K
A I D S
SERVICE AIDS
1. This type product is polarity sensitive. Be certain that your electrical supply wire neutral has
no voltage.
2. This unit will produce condensation — quite heavily at times. The outlet drain hose must be
allowed to drain. Exhaust Vent piping must also drain condensate. Code 11 error would imply
that these must be checked.
3. If the unit is located in a cold climate, take steps to ensure that exhaust vapors are not pulled
into the air intake. Terminate both pipes on direct vent installations in the same area, but max-
imize the distance between them.
4. Do not combine vent these units.
5. Pushing the reset button at random times may alter setting of the control. Note the sequence of
operation comments on when to push this button.
6. If you make a setting change, cycle the heater with this new setting to lock it into memory.
7. The first items to check on a service call
a. Correct venting installation
b. Drainage of condensate from hose and exhaust vent pipe
8. SUF models are certified to 6.800 ft. above sea level with the standard orifice — air and gas.
9. The temperature display board indicates average tank water temperature. If one tank sensor is
“open”, the indicator will display the active sensor temperature. (Because the top tank sensor
also contains the high limit-24V-sensor, disconnecting this from the control board results in an
error code (04).)
10. Temperature and pressure relief valve operation. Weeping usually indicates thermal expan-
sion. Large volume discharge usually indicates excessively hot water operation.
11. SUF models are well within decimal level limits, but if you desire to lower the installation level
approximately 6 decibels a muffler (Part No. 195334) may be installed in the exhaust vent.
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A I D S
SUF MUFFLER
N O T E S :
1. Install muffler in vertical position only.
2. Muffler must be a minimum of 8” from top of condensate elbow.
3. The muffler inlet and outlet are 4” PVC. If venting with a 4” PVC, a 4” x 4” PVC coupling (field
supplied) must be cemented to each end of the muffler. If venting with 3” PVC, a 4” x 3” PVC
reducing coupling (field supplied) must be cemented to each end of muffler (see illustration
above.)
4. Cement muffler into a location using ASTM D-2564 grade cement.
5. Secure muffler to suitable structure.
6. Operate heater through 1 heat cycle to ensure there are no exhaust leaks and there is no
obstruction of exhaust flow.
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H A N D B O O K
A N S W E R S
Q U E S T I O N S
A N D
QUESTIONS AND ANSWERS
Q. How much electrical power is required for a SUF water heater?
A. The SUF models draw approximately 5.0 Amps Max.
Q. When should SUF’s be delimed?
A. Many variables affect the lime build up process including:
• Water temperature — the amount of lime accumulation during the same period of time will be
nearly 2 times great if water is stored at 140 degrees F than at 120 degrees F. A 180° setting
may accumulate seven times more lime — in a period of time — than at 140° setting.
• Volume of water — the more gallons flowing through the SUF, the more rapid the
accumulation.
• Hardness — the harder the water the quicker lime build up occurs. 1 to 3.5 grains per gallons
is “soft”, 3.5 to 7 grains per gallon is “moderate”, 7 to 10.5 grains per gallons is “hard” and
10.5+ grains per gallon is “very hard”. (An aspirin is about 5 grains. One grain is equal to 17.1
parts per million.)
A. Deliming should be done when a slight rumbling or popping sound is detected when the main
burner is on. Check for accumulation through the clean-out opening.
Q. What effect will lime build-up have on the SUF water heater?
A. One eighth inch of scale buildup on the heat exchanger may reduce efficiency as much as
22%; a ¼ inch buildup, as much as 38%.
Less efficient heat transfer means more heat exchanger expansion/contraction stress and pre-
mature leakage.
Because the heat transfer to the water is made through a (relatively) small diameter, coil type
exchanger tube, expansion and contraction as well as the shape of the exchanger greatly
reduces buildup on the heat transfer surface. The bottom of the tank should be checked for
dislodged accumulation.
Q. Anode rods (4) provide additional protection against corrosion. When should these be
replaced?
A. When large gouges or pits appear in the anodes, replace them.
Q. How often should the anodes be inspected?
A. Approximately every six months.
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E R R O R
H A N D B O O K
C O D E S
ERROR CODES
CODE INDICATION
00 This is normal operation, 00 is displayed each time the heater is powered up.
Indicates the pressure switch circuit was not open during the prediagnostic system
check when the proper state of the Draft Prover Switches are verified. The Blower
Prover Switch is normally open, the circuit should therefore be open during the
prediagnostic system check at the beginning of each cycle. Check Blower Proving
01
Switch for continuity with the blower off, there should be no continuity, check
pressure switch wiring.
02 Indicates the heater failed to light after 3 trials. Check ignitor, gas pressure.
Indicates the ECO is open. Check water temperature in tank, ECO will open at 202°
F and can be reset below 160° F.
04
Indicates a Temperature Probe is open. Check both probes for proper resistance
and continuity.
05
Indicates the Pressure Switch Circuit did not close after blower was energized.
Check normally open Blower Prover Switch operation, check normally closed
11 Blocked Outlet, Inlet, and Low Gas pressure (SUF 240 only) to ensure they remain
closed. Check for blocked vent pipe (s) or if equivalent feet venting limits have been
exceeded.
Indicates temperature sensed by probe(s) is out of bounds, reading is less than
30° F. Check resistance of temp probes, check water temperature in tank.
15
Indicates Ignition Relay failure. Should be off and it is on. Try resetting, turn power
off and on, if code remains, replace board.
22
Indicates temperature sensed by probe(s) is out of bounds. Reading is more than
220° F. Check resistance of temp probes, check water temperature.
25
Internal software or hardware errors, electrical line noise can cause erratic
CODE #S
ABOVE
199
operation and these error codes. Try adding a “line filter” (available from electrical
suppliers) to the 120 VAC power supply. If these errors codes persist or the control
cannot be reset, replace the control board.
All these errors cause a “soft” lockout with the exception of 04 -
ECO, which is a “hard” lockout. Soft lockouts will reset automati-
cally after 60 minutes or if the reset button is pushed at any time.
The ECO lockout, error code 04 will have to be manually reset by
pushing the rest button after water in the tank has cooled below
160° F.
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S E R V I C E
C H E C K L I S T
SERVICE CHECKLIST
This is not intended to be and all-inclusive list of the problem that the Service Agent may encounter. Any item checked “no” on
this list should be thoroughly investigated and corrective action taken, if required.
SERVICE AGENT:
MODEL NUMBER:
SERIAL NUMBER:
INSTALLATION DATE:
SERVICE DATE:
LOCATION ADDRESS:
PHONE
(
)
-
GAS
TYPE — CHECK ONE
NATURAL
PROPANE
YES
NO
PROPER GAS VALUE VERIFIED
CHECK CLEARANCE (CIRCLE ANSWER)
I.
A.
B.
Are exterior clearances adequate?
Are interior clearances adequate?
Comments:
yes
yes
no
no
II.
CHECK MAKEUP AIR REQUIREMENTS
A.
Is the quality of make-up air adequate?
Comments:
yes
yes
no
no
B.
Is the quantity of make-up air adequate?
Comments:
III.
GAS PRESSURE (FILL IN BLANK) — ALL UNITS ON.
A.
B.
Supply gas pressure __ inches of W.C. (flowing)
Manifold gas pressure (main burner) __ inches of W.C. (flowing)
Comments:
IV. VENTING (CHECK)
A.
B.
Acceptable equivalent footage
Proper material
yes
yes
yes
yes
no
no
no
no
C. Proper exterior installation
D. Condensate will drain
Comments:
V. WATER PIPING
Is the system properly sized?
Is the system properly installed?
Are there any water leaks?
Does the installation have a recirculating system?
If so, is it operational?
yes
yes
yes
yes
yes
no
no
no
no
no
VI. SAFETY
A.
Air
yes
yes
no
no
If exhaust is blocked will unit lockout?
If air intake is blocked will unit lockout?
B.
Water Temperature
- Is the thermostat adjusted to the lowest acceptable temperature?
- Does the installation have a mixing valve?
yes
yes
yes
yes
no
no
no
no
- If so, is it operational?
- What is the outlet temperature of the mixing valve?
NOTE: To minimize the risk of scalding, the manufacturer recommends storing water at 120° F.
Is a properly rated temperature and pressure relief valve installed?
yes
yes
yes
no
no
no
Is there a properly installed expansion tank?
Should there be?
C. Electrical
Is the 120 VAC electrical powers supply properly wired? (including polarity)
Are all the SUF control covers in place?
Is the 120 VAC electrical power supply properly fused?
D. Flammables
yes
yes
yes
no
no
no
Are flammable materials located in the area of the water heater? or air intake?
Are flammable vapors located in the area of the water heater? or air intake?
Gas
yes
yes
no
no
E.
If the gas supply is reduced or turned off will the unit turn off?
Comments:
yes
no
[This service checklist may be photo copied to assist with SUF service calls.]
Technical Training Department
STC-077
State Water Heaters
Ashland City, Tennessee © 2004
40
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970 & 973 Series
STC-077
S U F
S E R V I C E
P A R T S
H A N D B O O K
L I S T
SUF SERVICE HANDBOOK
PARTS LIST
SUF MODELS 100 – 150, 100 – 199 AND 100 – 240
STATE WATER HEATERS
500 LINDHAL PARKWAY, ASHLAND CITY, TN 37015
PHONE: 1-800-821-2017 • FAX 1-800-644-9306
WWW.STATEWATERHEATERS.COM
State Water Heaters
Ashland City, Tennessee © 2004
Technical Training Department
STC-077
41
Download from Www.Somanuals.com. All Manuals Search And Download.
S U F
S E R V I C E
P A R T S
H A N D B O O K
L I S T
ULTRA FORCE SUF MODELS REPLACEMENT PARTS
SUF
100 150
SUF
100 199
SUF
100 240
SUF
100 150-LP
SUF
100 199-LP
ITEM DESCRIPTION
1 Anode
43817-53
181863
193354
192622-0
194114-1
192696
192806
191794-1
191746-72
193202
192473
192815
192478
192641-1
99038
43817-53
181863
193354
192622-0
194114
192696
192806
191794-1
191746-72
193202
192473
192815
192478
192641-1
99038
43817-53
181863
193203
192622-0
194114-2
192696
192806
191794-1
191746-72
193281
192473
192815
192478
192886-1
99038
43817-53
181863
193354
192622-0
194114-5
192696
192806
191794-1
191746-72
193202
192473
192815
192478
192886-1
99038
43817-53
181863
193354
192622-0
194114-4
1926964
192806
191794-1
191746-72
193202
192473
192815
192478
192886-1
99038
2 *Barb,Hose
3 Blower
4 Board,Display Panel
5 Burner Assembly
6 Clamp, 3
7 Clamp, Hose
8 Clamp,Hose,Nylon
9 Condensate Hose
10 *Direct Vent Kit
11 Elbow, 90 Degree
12 Exhaust Terminal
13 Flame Rod Assembly
14 Flange, Inlet
15 Gasket, C.O
16 Igniter Assembly
17 *Instruction Manual
18 Intake Terminal
19 Orifice, Gas
192638
195723
182167
192477-1
195721
99037
192638
195723
182167
192477
195721
99037
192638
195723
181762
192477-2
195721
99037
192638
195723
182167
192477-5
195721
99037
192638
195723
182167
192477-4
195721
99037
20 Panel,Front
21 Plate, C.O
22 *Screen, Exhaust
23 Press. Switch, Low Gas
24 Tube, Air
181662
- - - - -
181662
- - - - -
181662
191149-1
192469-10
26273-4
192454
192467
192331
195731
181662
- - - - -
181662
- - - - -
192469-10
26273-4
192797
192467
192331
195731
192469-10
26273-4
192797
192467
192331
195731
192469-10
26273-4
192454-1
192467
192331
195731
192469-10
26273-4
192454-1
192467
192331
195731
25 Valve, Drain
26 Valve, Gas
27 Valve, Relief
28 Gasket, Burner
29 Metal Cage Assy
Shaded parts are recommended stock items for emergency replacement. Consider gas used in your area only.
*Not illustrated.
Technical Training Department
STC-077
State Water Heaters
Ashland City, Tennessee © 2004
42
Download from Www.Somanuals.com. All Manuals Search And Download.
S U F
S E R V I C E
P A R T S
H A N D B O O K
L I S T
ULTRA FORCE SUF CONTROLS PARTS LIST
SUF
100 150
SUF
100 199
SUF
100 240
SUF
100 150-LP
SUF
100 199-LP
ITEM DESCRIPTION
1 Blocked Inlet Switch
2 Blocked Outlet Proving Switch
3 Blower Proving Switch
6 Cable to Control
193355
193362
193295
192623
193822
192622
196597
196598
193243
192608-1
192152
192024-3
192024-8
193363
193364
193295
192623
193822
192622
196597
196598
193243
192608-1
192152
192024-3
192024-8
193361
193357
193295
192623
193822
192622
196597
196598
193243
192608-1
192152
192024-3
192024-8
193355
193357
193295
192623
193822
192622
196597
196598
193243
192608-1
192152
192024-3
192024-8
193356
193357
193295
192623
193822
192622
196597
196598
193243
192608-1
192152
192024-3
192024-8
7 Control Board
8 Display Board
9 E.C.O./Upper Probe
10 Lower Temperature Probe
12 Switch-On/Off
13 Transformer
14 Tubing, Connector
15 Tubing, Pressure
16 Tubing, Pressure
Shaded parts are recommended stock items for emergency replacement. Consider gas used in your area only.
State Water Heaters
Ashland City, Tennessee © 2004
Technical Training Department
STC-077
43
Download from Www.Somanuals.com. All Manuals Search And Download.
S U F
S E R V I C E
P A R T S
H A N D B O O K
L I S T
N O T E S :
Technical Training Department
STC-077
State Water Heaters
Ashland City, Tennessee © 2004
44
Download from Www.Somanuals.com. All Manuals Search And Download.
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