State Water Heaters SUF 130 400 How to use

1
PRINTED 0509198152-002
COMMERCIAL GAS WATER HEATERS
FOR MODELS:
 • SUF60120
 • SUF100150
 • SUF100199
 • SUF100250
 • SUF130300
 • SUF130400
SERVICE HANDBOOK
HIGH EFFICIENCY
COMMERCIAL GAS SERIES

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 1 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
TABLE OF CONTENTS
INTRODUCTION...............................................................2
QUALIFICATIONS............................................................2
TOOLS REQUIRED.........................................................3
GENERAL INFORMATION................................................4
GAS PRESSURE SPECIFICATIONS ................................4
INSTALLATION QUICK TIPS – SUF 120 and 150 GAS
PRESSURE .....................................................................5
ADJUSTMENT PROCEDURE: .........................................5
GAS PRESSURE .............................................................5
SUF120 AND 150 MODELS..............................................5
HIGH ALTITUDE INSTALLATIONS ...................................5
SUF 120 - 150 .................................................................5
INSTALLATION QUICK TIPS - SUF 199 AND 250 GAS
PRESSURE .....................................................................6
ADJUSTMENT PROCEDURE:..........................................6
GAS PRESSURE .............................................................6
SUF 199 AND 250 MODELS ............................................6
HIGH ALTITUDE INSTALLATION......................................6
INSTALLATION QUICK TIPS - SUF 300, 400 GAS
PRESSURE......................................................................7
ADJUSTMENT PROCEDURE:..........................................7
GAS PRESSURE..............................................................7
SUF 300,400,....................................................................7
HIGH ALTITUDE ADJUSTMENT ......................................7
SUF 300,400,....................................................................7
INSTALLATION TIPS - SUF 300, 400 ...............................8
VENTING TABLES SUF 120 – 250....................................9
VENTING TABLES SUF 300,400,.....................................9
VENTING - ALL MODELS – SINGLE PIPE POWER VENT –
USING ROOM AIR..........................................................10
VENTING – ALL MODELS – TWO PIPE DIRECT VENT –
USING OUTSIDE AIR.....................................................11
VENT TERMINATION – DIRECT VENT – ALL MODELS. .12
DIRECT VENTING – ALL MODELS.................................13
CONTROL OVERVIEW ..................................................14
CONTROL OVERVIEW – ALL MODELS..........................14
ADJUSTING TANK TEMPERATURE – OPERATING SET
POINT - DIFFERENTIAL.................................................15
CHANGING THE DISPLAY UNITS..................................16
FAULT AND WARNING CONDITIONS – ADVANCED
DIAGNOSTIC INFORMATION.........................................17
ACCESS TO THE CURRENT FAULT OR WARNING.......18
VIEWING THE FAULT HISTORY - VIEWING
INFORMATION ABOUT THE HEATER............................19
CONTROL SEQUENCE (TYPICAL ALL MODELS).........20
CONTROL SEQUENCE FLOW CHART...........................21
CONTROLS – CENTRAL CONTROL BOARD – CCB ......22
CONTROLS – GAS VALVE SUF 120...............................23
CONTROLS – GAS VALVE SUF 150...............................23
CONTROLS – GAS VALVE SUF 199 and 250..................24
ADJUSTMENT PROCEDURE:........................................24
GAS PRESSURE ...........................................................24
SUF 199 AND 250 MODELS ..........................................24
CONTROLS – GAS VALVE SUF 199 and 250..................25
CONTROLS – GAS VALVE , ORIFICE CHART–
SUF300,400,...................................................................26
CONTROLS – PRESSURE SWITCHES – ALL MODELS..27
CONTROLS – PRESSURE SWITCHES – SUF 120 through
250.................................................................................28
CONTROLS – PRESSURE SWITCHES – SUF 300,400,. .29
CONTROLS – CONNECTIONS, IGNITER, FLAME
SENSOR, SIGHT GLASS, POWERED ANODES.............30
HOT SURFACE IGNITER / FLAME SENSOR / CONTROL
TIMING...........................................................................31
BLOWER SPEED CONTROL SUF 199 AND 250.............32
VARIABLE FREQUENCY DRIVE – SUF 400...................33
VARIABLE FREQUENCY DRIVE - BLOWER SPEED AND
PRESSURE READINGS..................................................34
WIRING DIAGRAM – SUF 120 – 300 ..............................35
WIRING DIAGRAM – SUF 400,.......................................36

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 2 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
INTRODUCTION
QUALIFICATIONS
ANSI Z223.1 Sec 3.3.83
"Qualified Agency"
"Any individual, firm, corporation or company
that ei ther i n person o r through a
representative i s e ngaged i n an d i s
responsible for (a) the installation, testing or
replacement of g as p iping or (b) the
connection, i nstallation, testing, re pair or
servicing of appliances and equipment; that
is experienced in such work; that is familiar
with all precautions required; and that has
complied w ith al l the re quirements o f the
authority having jurisdiction."
Service of this water heater requires ability
equivalent to th at of a Qual ified S ervice
Agent (l icensed t radesman) i n the fi eld
involved. Installation skills such as plumbing,
air supp ly, vent ing, gas s upply, e lectrical
supply are required in addition to electrical
testing ski lls. S ome pro ducts m ay requ ire
combustion testi ng equipment and
certification. If you do not possess these
skills or do not h ave the pr oper t ools y ou
should not attem pt to serv ice thi s w ater
heater.
The service handbook is designed to aid in
servicing and trou bleshooting S tate W ater
Heaters Ultra Force SUF commercial water
heaters i n t he f ield. No duplication or
reproduction of t his bo ok m ay be m ade
without the express written authorization of
State Water Heaters .
The fol lowing tex t and i llustrations w ill
provide you with a step by step procedure to
verify pr oper i nstallation, opera tion, and
troubleshooting procedures. Additional quick
reference da ta i s i ncluded to assist you in
servicing these products.
The information contained i n this handbook
is designed to answer co mmonly face d
situations enc ountered in the ope ration of
this product line and is not meant to be all
inclusive. If you are experiencing a problem
not covered in this handbook, please contact
State Water Heaters Technical Information at
1-800-365-0024, by e mail at
[e-mail] or your local
State Water Heater representative for further
assistance.
Our website:www.statewaterheaters.com
is also a resource for installation and service
information. Thi s handbook i s i ntended for
use by licensed plumbing professionals and
reference should be made to the installation
manual accom panying the prod uct. This
handbook contains supplemental information
to the produ ct’s i nstallation and ope ration
manual.

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 3 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
TOOLS REQUIRED
●ELECTRICAL MULTIMETER CAPABLE OF MEASURING CONTINUITY/ OHMS, AC
& DC VOLTS, AMPERES, MICROAMPERES, MILLIVOLTS, and FREQUENCY(Hz)
○UEi Model DL289 or equivalent
●DIGITAL MANOMETER + 60” W. C. in .01” increments
Note: A digital manometer is required for testing pressure switches and can replace
a gas pressure gauge, draft gauge or slack tube manometer for checking gas
pressure.
○UEi model EM200 or equivalent
●WATER PRESSURE GAUGE w/ LAZY HAND AND HOSE BIBB CONNECTION
●THERMOMETER
●1-1/16 INCH SOCKET WITH EXTENSION FOR ANODE REPLACEMENT
●SET OF NUMBERED DRILL BITS
DIGITAL MANOMETER DIGITAL MULTIMETER
WATER PRESSURE
TEST GAUGE W/ LAZY
HAND AND HOSE BIBB
CONNECTION

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 4 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
GENERAL INFORMATION
GAS PRESSURE SPECIFICATIONS
INSTALLATION REQUIREMENTS FOR THE
COMMONWEALTH OF MASSACHUSETTS
For al l side w all terminated, hor izontally vented
power v ent, direct vent, and power direct v ent gas
fueled w ater heat ers installed i n ev ery dwelling,
building or structure used in w hole or i n p art f or
residential pur poses, including t hose ow ned or
operated by the Commonwealth and where the side
wall exhaust vent termination is less than seven (7)
feet above finished grade in the area of the venting,
including but not limited to decks and porches, the
following requirements shall be satisfied:
INSTALLATION OF CARBON MONOXIDE
DETECTORS
At the time of installation of the side wall horizontal
vented gas fueled equipment, the installing plumber
or gas fitter shall observe that a hard wired carbon
monoxide detector with an alarm and battery back-
up is in stalled on t he f loor le vel wh ere t he g as
equipment is t o b e i nstalled. In add ition, t he
installing plumber or gas fitter shall observe that a
battery operated or har d w ired carbon monoxide
detector w ith an al arm i s i nstalled on eac h
additional level of the dwelling, building or structure
served by the sidewall horizontal vented gas fueled
equipment. It s hall b e the re sponsibility o f the
property owner to secure the services of qualified
licensed pr ofessionals for the i nstallation of har d
wired carbon monoxide detectors. In the event that
the s ide wall hor izontally v ented gas fueled
equipment is installed in a crawl space or an attic,
the hard wired carbon monoxide detector with alarm
and b attery b ack-up m ay be installed on the next
adjacent f loor l evel. I n t he e vent t hat the
requirements of this subdivision can not be met at
the t ime of c ompletion o f i nstallation, t he ow ner
shall have a period of thirty (30) days to comply with
the above requirements p rovided t hat dur ing said
thirty ( 30) day p eriod, a bat tery op erated carbon
monoxide detector with an alarm shall be installed
APPROVED CARBON MONOXIDE DETECTORS
Each carbon monoxide de tector as r equired in
accordance with the above provisions shall comply
with N FPA 720 and be AN SI/UL 20 34 listed and
CSA certified.
SIGNAGE
A m etal or p lastic i dentification plate s hall b e
permanently mounted to the exterior of the building
at a minimum height of eight (8) feet above grade
directly in line with the exhaust vent terminal for the
horizontally vented gas fueled heating appliance or
equipment. The sign shall read, in print size no less
than one-half (1/2”) inch in size,
“GAS VENT DIRECTLY BELOW. KEEP CLEAR
OF ALL OBSTRUCTIONS.”
MODELS Natural
120-150 Propane 120-150 Natural 199-250 Propane 199-250 Natural 300/400/500 Propane 300/400/500
Maximum Gas Supply Pressure 10.5” W C
(2.59kPa)
14.0“WC
( 3.45kPa)
10.5“WC
(2.59kPa)
14.0“WC
( 3.45kPa)
11.0”WC
(2.74kPa)
14.00”WC
(3.49kPa)
Nominal Gas Supply Pressure 7.0”WC
(1.74kPa)
11.0“WC
( 2.74kPa)
7.0“WC
(1.74kPa)
11.0“WC
( 2.74kPa)
7.0”WC
(1.74kPa)
11.0”WC
(2.74kPa)
Minimum Gas Supply Pressure
(Low Gas Press. Switch
Setting)
4.8”WC
(1.20kPa)
8.5“WC
( 2.12kPa)
4.8”WC
(1.20kPa)
8.5“WC
( 2.12kPa)
5.2”WC
(1.54kPa)
11.0“WC
( 2.74kPa)
Manifold Pressure 4.0”WC
(0.98kPa)
10.0“WC
(2.49 kPa)
0“WC
( 0 kPa)
0“WC
( 0 kPa)
4.00“WC
( 1.25kPa)
10.0“WC
( 2.49kPa)

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 5 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
INSTALLATION QUICK TIPS – SUF 120 and 150 GAS PRESSURE
ADJUSTMENT PROCEDURE:
GAS PRESSURE
SUF120 AND 150 MODELS
Main line gas pressure to the water heater for natural
gas should be between a maximum of 10.5"W.C.
(2.59kPa) for natural gas, 14.0"W.C.(3.45kPa) for
propane and a minimum of 4.8W.C.(1.18kPa) for
Natural Gas, and 8.5"W.C. (2.08kPa) for Propane
Gas.
Also see gas pressure specification table on page 4.
1.Check gas line pressure with a manometer.
2.Check manifold pressure gauge (manometer)
connected to the manifold pressure tap on the gas
control valve,
If full rate adjustment is required, remove cover screw
from top of the gas control valve. Using a small
screwdriver, turn adjusting screw clockwise to
increase or counterclockwise to decrease gas
pressure to obtain 4.0" W.C.(1 K pa) for natural gas
and 10.0" W.C. (2.5 kPa) for L.P. Gas.
3. Cycle the burner on and off several times to check
its operation.
4. Check the operation of the limit and operating
controls.
5. Check the vent system seams and joints and
ensure that there is no discharge of flue products into
the room.
6. Check the input rate.
HIGH ALTITUDE INSTALLATIONS
SUF 120 - 150
For appliance installation locations with elevations
above 6,500 feet (1982 meters) consult the “High
Altitude Installation” section of the owners manual.
a. Attach a pressure gauge (manometer) to the
manifold pressure tap and refer to page 4 for correct
pressure.
b. Use this formula to “clock” the meter. Be sure
other gas consuming appliances are not operating
during this interval.
Btuh = 3600 X H/ T
T = Time in seconds to burn 1 cubic foot of gas.
(With a stopwatch read the gas meter and measure
the amount of time required for the heater to consume
1 cubic foot of gas.)
H = Heating value of gas (in Btu’s per cubic foot of
gas).
Btuh = Actual heater input rate, in Btuh.
EXAMPLE: (Using SUF-150 heater)
T = 25.25 seconds
H = 1050 Btu/ft.3
BTUH = ?
Compare result to the de-rated input required for
the elevation at the installation location.
Should it be necessary to adjust the gas pressure to
the burner, to obtain the full input rate, the steps below
should be followed:
c. Remove the pressure regulator cover screw and
adjust the pressure by turning the adjusting screw with
a small screwdriver. Do not exceed 4.0" (1 kPa)
natural gas models and 10.0" w.c. (2.5kPa) on the
propane models. Clockwise to increase gas pressure
and input rate. Counterclockwise to decrease gas
pressure and input rate.
d. “Clock” the meter as in step (b) above.
e. Repeat steps (c) and (d) until the specified input
rate is achieved.
f. Turn the manual gas valve to “OFF”. Replace the
pressure regulator cover screw. Remove the pressure
gauge or manometer from the manifold pressure tap.
Replace the set screw in the manifold pressure tap. If
the gas pressure regulator cannot be adjusted to give
the full input rating with sufficient gas pressure at the
valve, check to ensure the unit is equipped with the
correct orifice.
A supply gas pressure regulator
(service regulator) must be installed on
the gas supply line within 10' (305 cm)
of the unit.

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 6 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
INSTALLATION QUICK TIPS - SUF 199 AND 250 GAS PRESSURE
ADJUSTMENT PROCEDURE:
GAS PRESSURE
SUF 199 AND 250 MODELS
THE SUF 199 AND 250 MODELS
INCORPORATE A NEW GAS CONTROL,
WHICH OPERATES AT A MANIFOLD
PRESSURE OF 0"W.C. (0 kPa) FOR BOTH
NATURAL AND PROPANE GAS. SEE THE
GAS PRESSURE CHART ON PAGE 4.
THESE MODELS ARE CONFIGURED
PRIOR TO BEING SHIPPED FROM THE
FACTORY AND NO ADJUSTMENTS ARE
NECESSARY PRIOR TO STARTUP. THE
CONTROLLER MONITORS THE AIR FLOW
AND MAKES ADJUSTMENTS TO THE FAN
SPEED WHICH IN EFFECT CONTROLS
THE AMOUNT OF GAS FLOW.
THEREFORE, THE UNIT WILL SELF
ADJUST TO ACQUIRE THE CORRECT
AMOUNT OF INPUT.
"Supply gas pressure to the water heater
must not exceed a maximum of 10.5" w.c.
(295kPa) for natural gas, or 14" w.c. (3.45
kPa) for propane. The minimum supply gas
pressure is 4.8" w.c. (1.20 kPa) for natural
gas and 8.5" w.c. (2.12 kPa) for propane
gas."
Once the unit is installed and filled with water
and the inlet pressures confirmed, simply
turn the switch "on" and observe operation.
Cycle the unit "off" and "on" several times to
ensure proper operation.
HIGH ALTITUDE INSTALLATION
The SUF 199 and 250 models are suitable
for installation up to 10,100 feet above sea
level with no adjustments.
GAS ORIFICE
The SUF 199 and 250 models do not have a
natural gas orifice. A .230” orifice is used on
LP gas models.
IMPORTANT NOTE
A supply gas pressure regulator
(service regulator) must be installed on
the gas supply line within 10' (305 cm)
of the unit.
Gas Control Without Orifice
Natural Gas
Venturi
Gasket
w/o orifice
Gas Control with .230” LP Orifice
Venturi
Gasket w/
LP Gas
Orifice
(.230”
Brass)

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 7 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
INSTALLATION QUICK TIPS - SUF 300, 400 GAS PRESSURE
ADJUSTMENT PROCEDURE:
GAS PRESSURE
SUF 300,400,
A minimum dynamic gas supply pressure of
5.2" w.c. (1.29 kPa) for Natural Gas and 11"
w.c. (2.74 kPa) for LP Gas is required before
making any adjustment to the gas control
pressure regulator. Attempts to adjust the
regulator during periods of low gas supply
pressure could result in over firing of the water
heater when the gas supply pressure returns to
normal.
1. Check gas line pressure with a manometer,
adjust the gas supply line pressure Gas Pressure
table on page 4.
2. Check manifold pressure using a pressure
gauge (manometer) connected to the manifold
pressure tap on the gas control valve, If full rate
adjustment is required, remove cover screw from
top of the gas control valve. Using a small
screwdriver, turn adjusting screw clockwise to
increase or counter clockwise to decrease gas
pressure to obtain 4.0" w.c. (0.996 kPa) for
Natural Gas and 10" w.c. (2.49kPa) for LP gas.
3. Cycle the burner on and off several times to
check its operation.
4. Check the operation of the limit and operating
controls.
5. Check the vent system seams and joints and
ensure that there is no discharge of flue products
into the room.
6. Check the input rate as shown on page 5.
HIGH ALTITUDE ADJUSTMENT
SUF 300,400,
For high altitude adjustments, contact the
help line on the front of the water heater or
contact [e-mail] .

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 8 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
INSTALLATION TIPS - SUF 300, 400

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 9 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
VENTING TABLES SUF 120 – 250
Maximum equivalent feet of intake and vent pipe using 3” PVC is 50 feet (15.2m). Equivalent feet
must include any 90° elbows (two 45° elbows equal one 90° elbow). Three inch diameter 90° elbows
are equivalent to 5' (1.5m) of pipe.
Maximum equivalent feet of intake and vent pipe using 4” PVC is 120 feet (36.6m).
Equivalent feet must include any 90° elbows (two 45° elbows equal one 90° elbow). Four inch
diameter 90° elbows are equivalent to 5' (1.5m) of pipe.
VENTING TABLES SUF 300,400,
Number of
90°Elbows 4" PVC Maximum Feet / meters of Pipe
ONE (1) 65' / 19.7 m
TWO (2) 60' / 18.2 m
THREE (3) 55' / 16.7 m
FOUR (4) 50' / 15.2 m
FIVE (5) 45' / 13.6 m
SIX (6) 40' / 12.1 m
Vent Length Table Equivalent Feet (Meters) 300,400,
Number of 90°
Elbows 3" Minimum Pipe (Ft./M.) 3" Maximum Pipe (Ft./M.) 4"Maximum Pipe (Ft./M.)
ONE (1) 7/2.1 45/13.7 115/35
TWO (2) 7/2.1 40/12.2 110/33.5
THREE (3) 7/2.1 35/10.7 105/32
FOUR (4) 7/2.1 30/9.1 100/30.5
FIVE (5) 7/2.1 --- 95/29
SIX (6) 7/2.1 --- 90/27.4
Vent Length Table Equivalent Feet (Meters) 120 through 250

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 10 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
VENTING - ALL MODELS – SINGLE PIPE POWER VENT – USING ROOM AIR

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 11 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
VENTING – ALL MODELS – TWO PIPE DIRECT VENT – USING OUTSIDE AIR

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 12 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
VENT TERMINATION – DIRECT VENT – ALL MODELS
WHEN LOCATING THE TERMINALS ON A SIDEWALL, THE FOLLOWING SPECIFICATIONS
PERTAINING TO TERMINAL LOCATION MUST BE FOLLOWED.
1. The intake vent terminal and the exhaust vent terminal must terminate on
the same exterior wall and must be located at a minimum of 24" (61cm)
from the vertical centerline of the exhaust vent terminal (see Figure 9).
In colder climates increasing the 24" (61cm) minimum will reduce
possibility of frost over from side winds blowing exhaust vapors to the
air intake of the direct vent.
2. The horizontal centerline of the intake vent terminal may not be located
lower than the horizontal centerline of the exhaust vent terminal

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 13 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
DIRECT VENTING – ALL MODELS
The air intake provided on the unit contains a mesh screen to prevent large particles from entering the
unit. WHEN THE UNIT IS TO BE SET UP AS A DIRECT VENT, THE BALANCE PLATE AND MESH
SCREEN MUST BE REMOVED BEFORE GLUING PIPE TO THE CONNECTOR. THE INLET VENT
PIPE MAY THEN BE GLUED TO THE AIR INTAKE PROVIDED ON THE UNIT.
Remove the balance plate and mesh
screen before gluing intake air pipe
to the fitting. 3” 120-250
4” 300- 400
45° PVC Elbow
Two 3” or 4” 45° PVC elbows with mesh screens are provided with each unit. Both elbows are
to be used in direct vent applications. The screens are provided to keep vermin and large
debris from entering the intake air and exhaust vent runs.

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 14 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
CONTROL OVERVIEW – ALL MODELS
Interaction with the water heater controller is done
through an LCD display called the Universal
Interface Module (UIM).This screen is also referred to
as the “desktop” or “desktop menu”. Up and down
buttons and three operation buttons allow navigation
through the control menus and to make adjustments to
the water heater. Operation of the three lower buttons
is defined immediately above them on the screen.
While the water heater is operating, the user interface
will display the desktop screen (if there are no active
faults or warnings).
●An example of this screen is shown below.
●The first temperature on this screen is the
temperature of the water inside the tank.
●The second temperature on this screen is the
Operating Set Point.
●The Operating Set Point is the temperature at
which the water heater will maintain the water
inside the tank.
●The third line on the screen is a text
description of the Operational State of the
water heater. The operating state of the water
heater is also indicated graphically by status
icons.
The table of status icons describes graphically
operational details of the water heater. Below is a
legend of all the status icons:
Status
Icon Description
The temperature of the water in the tank has
fallen and the water heater will now initialize a
new heating cycle.
The temperature of the water in the tank has
reached the Operating Set Point.
The cont rol i s un able t o i nitiate any f urther
heating cycles. This is usually caused by a fault
condition detected by the control, but can also
occur when an external system (like an energy
management sys tem) has as ked t he w ater
heater to discontinue any further heat cycles.
The blower is being energized.
The blower pressure switch has been made.
The igniter has been energized.
The igniter has been energized and sufficient
current for ignition has been detected.
The control has requested that the gas valve
be turned on.
The control has sensed flame in the burner.
The control has detected a fault condition. A
fault condition will cause the water heater to
discontinue operation.
The control has detected a warning condition.
These conditions w ill not cause t he water
heater to discontinue further heating cycles, but
does merit attention.
CONTROL OVERVIEW
^
OPERATION
BUTTONS
UP AND
DOWN
BUTTONS

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 15 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
ADJUSTING TANK TEMPERATURE – OPERATING SET POINT - DIFFERENTIAL
The Operating Set Point of this water heater
determines the regulated temperature for the water in
the tank. This parameter is adjusted in the desktop
Temperature menu. Items in this menu allow you to
monitor different temperature readings in the tank
along with adjusting the Operating Set Point and
Differential.
ACTION:
From the desktop screen, press Menu.
DISPLAY:
ACTION:
From the Main Menu, press Select to enter the
"Temperatures" screen.
DISPLAY:
ACTION:
Press Change then use the UP and DOWN buttons to
change the temperature Set Point.
DISPLAY:
Note: This procedure can also be used to change the
Differential. The tank Upper and Lower Temperatures
are not user changeable. They are determined by the
temperature probes on the heater.
ACTION:
Press Update to accept the change or Cancel to reset
it.
DISPLAY:

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 16 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
CHANGING THE DISPLAY UNITS
The desktop menu has the option of selecting
between degrees Fahrenheit and degrees Celsius for
temperature displays. This can be found in the
“Display Settings” menu. Also in this menu, you may
adjust how the back-light operates and the contrast of
the LCD screen.
ACTION:
From the Main Menu, press the DOWN button to
highlight "Display Settings" then press Select.
DISPLAY:
ACTION:
Use the UP and DOWN buttons to highlight the
desired setting. Then press Change. Again, use the
UP and DOWN buttons to scroll through the options
for that setting.
DISPLAY:
ACTION:
Press Update to accept the change or Cancel to
reject it.
DISPLAY:

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 17 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
FAULT AND WARNING CONDITIONS – ADVANCED DIAGNOSTIC INFORMATION
This water heat er c ontrol has t he abil ity t o m onitor
almost all aspects of the water heater's operation. In
the c ase t hat there i s an undes irable or uns afe
condition t hat o ccurs, t he water heat er control will
detect t his c ondition and de termine the appropriate
action. T he w ater heat er c ontrol will di splay t he
information on the desktop in plain text that accurately
describes the condition and diagn ostics i nformation
that can be used to correct the issue.
There are t wo t ypes o f c onditions t hat c an oc cur
during operation. These are Warnings and Faults:
Warnings: This is a non-safety related condition that
the c ontrol has det ected t hat m ay c ause the w ater
heater to operate in a less than optimal condition, but
does not pose a safety concern.
NOTE: When t hese conditions oc cur, continued
heating cycles will continue and the heater will attempt
to regulate the water in the tank to the Operating Set
Point.
Example of a Warning:
Faults: This is a safety related condition that has been
detected by the heater.
NOTE: When these conditions occur, the water heater
WILL NOT CONTINUE any further heating cycles and
the water will no longer be heated until the condition is
corrected and, in most cases, power has been cycled.
Example of a Fault:
Advanced Diagnostic Information
When a fault or warning has been declared, advanced
information can be f ound i n the control. By pressing
the A dvanced but ton, det ailed i nformation can be
found regarding diagnosing and resolving the problem.
WARNING: Usage of the Advanced information
requires ability equivalent to that of a licensed
tradesmen in the field involved.

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 18 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
ACCESS TO THE CURRENT FAULT OR WARNING
When a fault or warning has been detected by the
control it will automatically be displayed on the screen
and the back light will blink. If you choose to leave the
current fault or warning by pressing the Back key, you
can always return to the fault through the display
menu through the menu.
ACTION:
To get to the current fault information screen, press
Menu.
DISPLAY:
ACTION:
Press the DOWN button for more information.
DISPLAY:

ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 19 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
VIEWING THE FAULT HISTORY - VIEWING INFORMATION ABOUT THE HEATER
The controller for this water heater will store a history
of ten of the last Fault and Warning conditions that
occurred. This is stored in the Fault History. The
information about the fault or warning will include
diagnostic information as well as an estimate of how
long ago the fault occurred.
ACTION:
Press the SELECT button for more information.
DISPLAY:
ACTION:
Press the DOWN key to scroll through the fault
history. If you select a specific fault or warning, you
may press the VIEW button to view details regarding
this fault.
DISPLAY:
Viewing Information About the Water Heater
The control for this water heater monitors many
different aspects of the water to ensure safe and
optimal operation. Much of the information monitored
is available to view in two areas of the control. The
first is the "Heater Status" and; the second is
"Heater Information."
These items can be selected through the desktop
menu. In these menus, detailed information about the
water heater and the current status of specific
conditions can be found.