State Industries Water Heater SUF 100 THRU 250 User Manual

Service Handbook  
COMMERCIAL GAS HIGH EFFICIENCY WATER HEATERS  
MODELS: SUF 60 thru 120  
SUF 100 thru 250  
SUF 130 thru 500  
SERIES 100, 101 and 104.  
500 Tennessee Waltz Parkway  
Ashland City, TN 37015  
SERVICING SHOULD ONLY BE PERFORMED BY A QUALIFIED SERVICE AGENT  
PRINTED IN THE U.S.A. 0511  
198152-003  
Download from Www.Somanuals.com. All Manuals Search And Download.  
1
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
INTRODUCTION  
The service handbook is designed to aid in servicing and troubleshooting State Water Heaters Ultra Force  
SUF commercial water heaters in the field. No duplication or reproduction of this book may be made  
without the express written authorization of the State Water Heaters.  
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 these products.  
The information contained in this handbook is designed to answer commonly faced situations encountered  
in the operation 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 email at help@statewaterheaters.com, or your local State Water Heaters representative for further  
assistance. Our website at: www.statewaterheaters.com is also a resource for installation and service  
information. This handbook is intended for use by licensed plumbing professionals and reference should  
be made to the installation manual accompanying the product. This handbook contains supplemental  
information to the product’s installation and operation manual.  
QUALIFICATIONS  
ANSI Z223.1 Sec 3.3.83  
“Qualified Agency”  
“Any individual, firm, corporation or company that either in person or through a representative is engaged  
in and is responsible for (a) the installation, testing or replacement of gas piping or (b) the connection,  
installation, testing, repair or servicing of appliances and equipment; that is experienced in such work; that  
is familiar with all precautions required; and that has complied with all the requirements of the authority  
having jurisdiction.”  
Service of this water heater requires ability equivalent to that of a Qualified Service Agent (licensed  
tradesman) in the field involved. Installation skills such as plumbing, air supply, venting, gas supply,  
electrical supply are required in addition to electrical testing skills. Some products may require combustion  
testing equipment and certification. If you do not possess these skills or do not have the proper tools you  
should not attempt to service this water heater.  
2
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
TOOLS REQUIRED  
ELECTRICAL MULTIMETER CAPABLE OF MEASURING CONTINUITY/ OHMS, AC & DC VOLTS,  
AMPERES, MICROAMPERES, MILLIVOLTS, and FREQUENCY (Hz)  
UEi Model DL289 or equivalent  
DIGITAL MANOMETER + 60" W. C. in .01" increments  
Note: A digital manometer is required for testing pressure switches and can replace a gas pressure  
gauge, draft gauge or slack tube manometer for checking gas pressure.  
UEi model EM200 or equivalent  
WATER PRESSURE GAUGE w/LAZY HAND AND HOSE BIBB CONNECTION  
THERMOMETER  
1-1/16 INCH SOCKET WITH EXTENSION FOR ANODE REPLACEMENT  
SET OF NUMBERED DRILL BITS  
WATER PRESSURE  
TEST GAUGE W/LAZY  
HAND AND HOSE BIBB  
CONNECTION  
DIGITAL MANOMETER  
DIGITAL MULTIMETER  
3
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
GENERAL INFORMATION  
INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS  
For all side wall terminated, horizontally vented power vent, direct vent, and power direct vent gas fueled  
water heaters installed in every dwelling, building or structure used in whole or in part for residential  
purposes, including those owned 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 backup  
is installed on the floor level where the gas equipment is to be installed. In addition, the installing plumber  
or gas fitter shall observe that a battery operated or hard wired carbon monoxide detector with an alarm  
is installed on each additional level of the dwelling, building or structure served by the sidewall horizontal  
vented gas fueled equipment. It shall be the responsibility of the property owner to secure the services of  
qualified licensed professionals for the installation of hard wired carbon monoxide detectors. In the event  
that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the hard  
wired carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent  
floor level. In the event that the requirements of this subdivision can not be met at the time of completion  
of installation, the owner shall have a period of thirty (30) days to comply with the above requirements  
provided that during said thirty (30) day period, a battery operated carbon monoxide detector with an alarm  
shall be installed.  
APPROVED CARBON MONOXIDE DETECTORS  
Each carbon monoxide detector as required in accordance with the above provisions shall comply with  
NFPA 720 and be ANSI/UL 2034 listed and CSA certified.  
SIGNAGE  
A metal or plastic identification plate shall be 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.”  
GAS PRESSURE SPECIFICATIONS  
Natural  
120‑150  
Propane  
120‑150  
Natural  
199‑250  
Propane  
199‑250  
Natural  
300/400/500  
Propane  
300/400/500  
MODELS  
Maximum Gas  
Supply Pressure  
10.5" WC  
(2.59 kPa)  
14.0" WC  
(3.45 kPa)  
10.5" WC  
(2.59 kPa)  
14.0" WC  
(3.45 kPa)  
11.0" WC  
(2.74 kPa)  
14.00" WC  
(3.49 kPa)  
Nominal Gas  
7.0" WC  
11.0" WC  
7.0" WC  
11.0" WC  
7.0" WC  
11.0" WC  
Supply Pressure  
(1.74 kPa)  
(2.74 kPa)  
(1.74 kPa)  
(2.74 kPa)  
(1.74 kPa)  
(2.74 kPa)  
Minimum Gas  
Supply Pressure  
(Low Gas Press.  
Switch Setting)  
4.8" WC  
(1.20 kPa)  
11.0" WC  
(2.74 kPa)  
4.8" WC  
(1.20 kPa)  
8.5" WC  
(2.12 kPa)  
5.2" WC  
(1.54 kPa)  
11.0" WC  
(2.74 kPa)  
4.0" WC  
(0.98 kPa)  
10.0" WC  
(2.49 kPa)  
0" WC  
(0 kPa)  
0" WC  
(0 kPa)  
4.00" WC  
(1.25 kPa)  
10.0" WC  
(2.49 kPa)  
Manifold Pressure  
4
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
INSTALLATION QUICK TIPS – SUF 120 AND 150 GAS PRESSURE  
ADJUSTMENT PROCEDURE: GAS PRESSURE SUF 120 AND 150 MODELS  
Main line gas pressure to the water heater for natural gas should be between a maximum of 10.5" w.c.  
(2.59 kPa) for natural gas, 14.0" w.c. (3.45 kPa) for propane and a minimum of 4.8 w.c. (1.18 kPa) for  
Natural Gas, and 8.5" w.c. (2.08 kPa) for Propane Gas. Also see gas pressure specification table on  
page 4.  
A supply gas pressure regulator (service regulator) must be installed on the gas supply line within  
10' (305 cm) of the unit.  
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 kPa) 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.  
1. Attach a pressure gauge (manometer) to the manifold pressure tap and refer to page 4 for correct  
pressure.  
2. 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 = ?  
5
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
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:  
3. 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. (2.5 kPa)  
on the propane models. Clockwise to increase gas pressure and input rate. Counterclockwise to  
decrease gas pressure and input rate.  
4. “Clock” the meter as in step (2) above.  
5. Repeat steps (3) and (4) until the specified input rate is achieved.  
6. 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.  
6
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
INSTALLATION QUICK TIPS – SUF 199 AND 250 GAS PRESSURE  
ADJUSTMENT PROCEDURE: GAS PRESSURE SUF 199 AND 250 MODELS  
IMPORTANT NOTE  
THE SUF 199 AND 250 MODELS INCORPORATE A NEW GAS CONTROL, WHICH OPERATES AT  
A MANIFOLD PRESSURE OF 0" w.c. (0 kPa) FOR BOTH NATURAL AND PROPANE GAS. SEE  
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. (2.95 kPa) 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.  
Venturi  
Gasket  
w/o Orifice  
Venturi  
Gasket  
w/LP Gas  
Orifice  
(.230")  
Brass  
Gas Control Without Orifice Natural Gas  
Gas Control with .230" LP Orifice  
A supply gas pressure regulator (service regulator) must be installed on the gas supply line within  
10' (305 cm) of the unit.  
7
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
INSTALLATION QUICK TIPS – SUF 300, 400, 500 GAS PRESSURE  
ADJUSTMENT PROCEDURE: GAS PRESSURE SUF 300, 400, 500  
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.  
Check gas line pressure with a manometer, adjust the gas supply line pressure Gas Pressure table on  
page 4.  
1. 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.  
(2.49 kPa) for LP gas.  
2. Cycle the burner on and off several times to check its operation.  
3. Check the operation of the limit and operating controls.  
4. Check the vent system seams and joints and ensure that there is no discharge of flue products into  
the room.  
5. Check the input rate as shown on page 6.  
HIGH ALTITUDE ADJUSTMENT SUF 300, 400, 500  
For high altitude adjustments, contact the help line on the front of the water heater or contact  
8
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
INSTALLATION QUICK TIPS – SUF 300, 400, 500  
SEE MANUAL FOR COMPLETE INSTALLATION INSTRUCTIONS & DETAILS  
9
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
INSTALLATION – VENTING CATEGORY AND MATERIALS  
ULTRA FORCE VENTING  
Category IV  
Positive pressure in vent, above atmospheric.  
These models will produce excessive condensate in vent.  
Vent system must not be combined with any other appliances.  
Flue gas temperatures less than 140°F.  
Condensing water heater, thermal efficiency of this product will produce condensate in  
the vent system, the heater is equipped with provision for draining condensate from vent  
system.  
PH of condensate approximately 3.59; within tolerance for cast iron drains.  
Type venting  
May be installed Direct Vent; draws all fresh air for combustion from and discharges flue  
gases to the outdoor atmosphere through 2 pipes.  
May be installed Conventional Vent; uses room air for combustion and discharges flue  
gases to the outdoor atmosphere through 1 pipe.  
Vertical and horizontal  
Vent materials  
Vent system can be terminated vertically or horizontally (side wall).  
PVC schedule 40.  
CPVC schedule 40.  
ABS schedule 40.  
Cellular Core PVC.  
Concentric Venting  
Concentric vent kits for all models.  
10  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
VENTING TABLES – SUF 120 ‑ 250  
Maximum equivalent feet of intake and vent pipe using 3" PVC is 50 feet (15.2 m). Equivalent feet must  
include any 90° elbows (two 45° elbows equal one 90° elbow). Three inch diameter 90° elbows are  
equivalent to 5' (1.5 m) of pipe.  
Maximum equivalent feet of intake and vent pipe using 4" PVC is 120 feet (36.6 m). Equivalent feet  
must include any 90° elbows (two 45° elbows equal one 90° elbow). Four inch diameter 90° elbows are  
equivalent to 5' (1.5 m) of pipe.  
Vent Length Table Equivalent Feet (Meters) 120 through 250  
Number of 90° Elbows  
ONE (1)  
3" Minimum Pipe (Ft./M.)  
3" Maximum Pipe (Ft./M.)  
4" Maximum Pipe (Ft./M.)  
7/2.1  
7/2.1  
7/2.1  
7/2.1  
7/2.1  
7/2.1  
45/13.7  
40/12.2  
35/10.7  
30/9.1  
115/35  
110/33.5  
105/32  
100/30.5  
95/29  
TWO (2)  
THREE (3)  
FOUR (4)  
FIVE (5)  
SIX (6)  
90/27.4  
VENTING TABLES – SUF 300, 400, 500  
Vent Length Table Equivalent Feet (Meters) 300, 400, 500  
Number of 90° Elbows  
4" PVC Maximum  
Feet/meters of Pipe (Ft./M.)  
ONE (1)  
TWO (2)  
THREE (3)  
FOUR (4)  
FIVE (5)  
SIX (6)  
65'/19.7 m  
60'/18.2 m  
55'/16.7 m  
50'/15.2 m  
45'/13.6 m  
40'/12.1 m  
11  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
CONCENTRIC VENTING  
Concentric venting allows for a single wall penetration. For multiple water heater installation using this vent  
practice any additional vents of this type may be located 12" on centerline to either side of the first vent or  
12" on centerline vertically above the first vent. Concentric kits may be extended to a maximum allowable  
length of 5 feet (152 cm). Schedule 40 PVC pipe must be carefully measured and cut to the desired length.  
Do not use couplings when extending the length of a concentric termination. The use of couplings will  
restrict the flow through the termination and may cause improper combustion.  
SUF Concentric Vent for 120 through 300.  
SUF Concentric Vent for 400 through 500.  
Figure 1  
12  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
VENT CONDENSATION  
6” PIPE FIELD  
SUPPLIED  
6” x 4” REDUCER  
FIELD SUPPLIED  
4” PIPE FIELD  
SUPPLIED  
EXHAUST ELBOW  
VENT CONNECTION  
FACTORY INSTALLED  
VENT (EXHAUST) CONNECTION  
Failure to properly install the drain line on the condensate elbow will result in a water heater shut  
down and a “blocked exhaust” fault message.  
The average dew point 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 approximately 140°F.  
Q. CAN I DRAIN THIS CONDENSATION TO THE FLOOR DRAIN?  
A. 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.”  
Q. WHAT ABOUT THE PH VALUES OF CONDENSATE AND SODA POP?  
A. The pH of the SUF condensate average 4.5 which is approximately 4 times less concentrated than the  
limit of 4.3 recommended 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.  
Q. WHAT DOES THE PH SCALE MEAN?  
A. The PH value is a measure of acidity or 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.  
Q. WHAT ABOUT CONDENSATE NEUTRALIZERS?  
A. Condensate neutralizers are usually not necessary. 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 equipment. 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.  
13  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
VENTING – ALL MODELS – SINGLE PIPE DIRECT VENT – USING OUTSIDE AIR  
TERMINATION CLEARANCES SIDEWALL POWER VENT  
POWER VENT  
(using room air for combustion)  
EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION  
G
V
H
D
A
E
v
L
B
v
B
B
B
V
C
B
D
E
X
I
F
E
D
CLOSED  
E
X
I
OPERABL  
F
V
M
V
V
X
CLOSED  
V
E
X
OPERABL  
V
F
B
K
J
A
VENT TERMINAL  
AIR SUPPLY INLET  
AREA WHERE TERMINAL IS NOT PERMITTED  
V
X
Figure 2  
Vent terminal clearances for “Power Vent” installations. Power Vent configurations use room air for combustion.  
1
2
1
2
CANADIAN INSTALLATIONS  
US INSTALLATIONS  
CANADIAN INSTALLATIONS  
US INSTALLATIONS  
Clearance to each side  
of center line extended  
above meter/regulator  
assembly  
3 feet (91 cm) within a  
height 15 feet (4.5 m)  
above the meter/regulator  
assembly*  
Clearance above grade,  
veranda, porch, deck or 12 inches (30 cm)  
balcony  
3 feet (91 cm) within a height 15 feet  
(4.5 m) above the meter/  
regulator assembly  
12 inches (30 cm)  
A
B
H
I
6 inches (15 cm) for appliances up to  
10,000 Btu/hr (3 kW), 12 inches (30  
cm) for appliances between 10,000  
4 feet (1.2 m) below  
or to side of opening;  
Btu/hr (3 kW) and 100,000 Btu/hr (30 1 foot (30 cm) above  
kW), 36 inches (91 cm) for appliances opening  
above 100,000 Btu/hr (30 kW)  
Clearance to window  
or door that may be  
opened  
Clearance to service  
regulator vent outlet  
3 feet (91 cm)  
3 feet (91 cm)*  
6 inches (15 cm) for appliances up  
to 10,000 Btu/hr (3 kW), 12 inches  
(30 cm) for appliances between  
10,000 Btu/hr (3 kW) and 100,000  
Btu/hr (30kW), 36 inches (91cm)  
for appliances above 100,000 Btu/  
hr (30 kW)  
Clearance to a non  
mechanical air supply  
inlet into building or  
combustion air inlet to  
any other appliance  
4 feet (1.2 m) below or to  
side of opening; 1 foot  
(30 cm) above opening.  
Clearance to  
permanently closed  
window  
12 inches (30 cm)*  
12 inches (30 cm)*  
C
J
Vertical clearance to  
ventilated soffit located  
above the terminal  
within a horizontal  
distance of 2 feet (61  
cm) from the center line  
of the terminal  
3 feet (91 cm) above if  
within  
10 feet (3 m) horizontally  
Clearance to a  
mechanical air supply  
inlet  
12 inches (30 cm)*  
12 inches (30 cm)*  
12 inches (30 cm)*  
12 inches (30 cm)*  
6 feet (1.83 m)  
7 feet (2.13 m)†  
D
E
K
Clearance above paved  
sidewalk or paved  
driveway located on  
public property  
Clearance to  
unventilated soffit  
7 feet (2.13 m)  
L
Clearance under  
veranda, porch, deck, or 12 inches (30 cm) ‡  
balcony  
Clearance to outside  
corner  
2 feet (60 cm)*  
2 feet (60 cm)*  
12 inches (30 cm) ‡  
F
M
Clearance to inside  
corner  
18 inches (45 cm)*  
18 inches (45 cm)*  
G
1 In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.  
2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.  
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.  
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.  
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.  
14  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
VENTING – ALL MODELS – TWO PIPE DIRECT VENT – USING OUTSIDE AIR  
TERMINATION CLEARANCES SIDEWALL DIRECT VENT  
DIRECT VENT  
(using outdoor air for combustion)  
EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION  
G
V
H
D
A
E
v
L
B
v
B
B
B
V
C
B
D
E
X
I
F
E
D
CLOSED  
E
X
I
OPERABL  
F
V
M
V
V
X
CLOSED  
V
E
X
OPERABL  
V
F
B
K
J
A
VENT TERMINAL  
AIR SUPPLY INLET  
AREA WHERE TERMINAL IS NOT PERMITTED  
V
X
Figure 3  
Vent terminal clearances for “Direct Vent” installations. Direct Vent configurations use outdoor air for combustion.  
1
2
1
2
CANADIAN INSTALLATIONS  
US INSTALLATIONS  
CANADIAN INSTALLATIONS  
US INSTALLATIONS  
Clearance to each side  
of center line extended  
above meter/regulator  
assembly  
Clearance above grade,  
veranda, porch, deck or 12 inches (30 cm)  
balcony  
3 feet (91 cm) within a height 15  
feet (4.5 m) above the meter/  
regulator assembly  
3 feet (91 cm) within a height  
15 feet (4.5 m) above the  
meter/regulator assembly*  
12 inches (30 cm)  
A
B
H
I
6 inches (15 cm)  
for appliances up to  
10,000 Btu/hr (3 kW),  
9 inches (23 cm) for  
appliances between  
10,000 Btu/hr (3 kW)  
and 50,000 Btu/hr (15  
kW), 12 inches (30 cm)  
for appliances above  
50,000 Btu/hr (15 kW)  
6 inches (15 cm) for appliances  
up to 10,000 Btu/hr (3 kW), 12  
inches (30 cm) for appliances  
between 10,000 Btu/hr (3 kW)  
and 100,000 Btu/hr (30 kW), 36  
inches (91 cm) for appliances  
above 100,000 Btu/hr (30 kW)  
Clearance to window or  
door that may be opened  
Clearance to service  
regulator vent outlet  
3 feet (91 cm)  
3 feet (91 cm)*  
6 inches (15 cm) for  
6 inches (15 cm) for appliances up  
to 10,000 Btu/hr (3 kW), 12 inches  
(30 cm) for appliances between  
10,000 Btu/hr (3 kW) and 100,000  
appliances up to 10,000  
Btu/hr (3 kW), 9 inches (23  
cm) for appliances between  
10,000 Btu/hr (3 kW) and  
50,000 Btu/hr (15 kW), 12  
inches (30 cm) for appliances  
above 50,000 Btu/hr (15 kW)  
Clearance to a non  
mechanical air supply  
inlet into building or  
Clearance to  
permanently closed  
window  
6 inches (15 cm)*  
6 inches (15 cm)*  
C
J
combustion air inlet to Btu/hr (30 kW), 36 inches (91 cm)  
any other appliance  
for appliances above 100,000 Btu/  
hr (30 kW)  
Vertical clearance to  
ventilated soffit located  
above the terminal within  
a horizontal distance of  
2 feet (61 cm) from the  
center line of the terminal  
Clearance to a  
mechanical air supply  
inlet  
3 feet (91 cm) above if within  
10 feet (3 m) horizontally  
12 inches (30 cm)*  
12 inches (30 cm)*  
12 inches (30 cm)*  
12 inches (30 cm)*  
6 feet (1.83 m)  
D
E
K
Clearance above  
Clearance to unventilated  
soffit  
paved sidewalk or  
paved driveway located  
on public property  
7 feet (2.13 m)†  
7 feet (2.13 m)†*  
L
Clearance under  
veranda, porch, deck,  
or balcony  
Clearance to outside  
corner  
2 feet (60 cm)*  
2 feet (60 cm)*  
12 inches (30 cm) ‡  
12 inches (30 cm) ‡*  
F
M
Clearance to inside  
corner  
18 inches (45 cm)*  
18 inches (45 cm)*  
G
1 In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.  
2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.  
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.  
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.  
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.  
15  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
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" (61 cm) from the vertical centerline of the exhaust vent  
terminal (see Figure below). In colder climates increasing this separation to atleast 48" (122 cm) 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.  
16  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
DIRECT VENTING – ALL MODELS  
The air intake provided on the unit contains a mesh screen to prevent large particles from entering the unit.  
WHEN THE UNIT IS TO BE SET UP AS A DIRECT VENT, THE BALANCE PLATE AND MESH SCREEN  
MUST BE REMOVED BEFORE GLUING PIPE TO THE CONNECTOR. THE INLET VENT PIPE MAY  
THEN BE GLUED TO THE AIR INTAKE PROVIDED ON THE UNIT.  
45° PVC Elbow  
Remove the balance plate (SUF 400/  
500 only) and mesh screen before  
3" 120-250  
gluing intake air pipe to the fitting.  
4" 300-500  
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.  
17  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
CONTROL OVERVIEW  
Interaction with the water heater controller is 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.  
18  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
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 control is unable to initiate any further 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  
system) has asked the water 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 will  
not cause the water heater to discontinue further heating cycles, but  
does merit attention.  
19  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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:  
20  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
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:  
21  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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:  
22  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
ACTION:  
Press Update to accept the change or Cancel to reject it.  
DISPLAY:  
23  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FAULT AND WARNING CONDITIONS – ADVANCED DIAGNOSTIC INFORMATION  
This water heater control has the ability to monitor almost all aspects of the water heater’s operation. In the  
event of an undesirable or unsafe condition that occurs, the water heater control will detect this condition and  
determine the appropriate action. The water heater control will display the information on the desktop in plain  
text that accurately describes the condition and diagnostics information that can be used to correct the issue.  
There are two types of conditions that can occur during operation. These are Warnings and Faults:  
Warnings: This is a non-safety related condition that the control has detected that may cause the water  
heater to operate in a less than optimal condition, but does not pose a safety concern.  
Note: When these conditions occur, 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 found in the control. By pressing  
the Advanced button, detailed information can be found regarding diagnosing and resolving the problem.  
WARNING: Usage of the Advanced information requires ability equivalent to that of a licensed  
tradesman in the field involved.  
24  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
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.  
ACTION:  
To get to the current fault information screen, press Menu.  
DISPLAY:  
ACTION:  
Press the DOWN button for more information.  
DISPLAY:  
25  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
FAULT CODES  
All faults, warnings, and errors are given in plain English text. Some have a Code alpha/numeric value  
assigned. Please read the full English text and not the alpha/numeric value when calling for assistance.  
Following is a complete list of all faults, warnings, and errors for this commercial gas control.  
0x0D: AC Reversed  
0x45: Upper Probe Short  
0x46: Lower Probe Short  
0x47: Upper Probe Open  
0x48: Lower Probe Open  
0xB4: Flame Probe Short  
0xA9: Flame Detect Error  
0xA5: Energy Cut Out (ECO)  
0xA6: Low Gas  
0xA7: Blocked Air Intake  
0xA8: Blocked Exhaust Event  
0xAC: Blower Prover Failure  
0x1AC: Blower Prover Open  
0xAE: Igniter Current Error  
0x1AE: Low Igniter Current  
0xB2: Ignition Failure  
0xAA: Gas Valve Error  
0x1AA: Gas Valve Failure  
EEPROM Failure  
Hardware Failure  
RAM Failure  
UIM Screen  
Model Config Fail  
Power Supply Fail  
MCB Comm Error  
Communication Failure  
Low Anode Protection (Warning)  
0xD2: No Anode Current (Warning)  
0xD6: No Anode Voltage (Warning)  
26  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
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.  
27  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
CONTROL SEQUENCE (TYPICAL ALL MODELS)  
TYPICAL SEQUENCE  
1. When the control is powered it should display “waiting for connection” and “UIM v2.06”*. The  
manufacturer and unit model will be next. The next display will include water temperature,  
temperature setting and heater status.  
* This number may change as software revisions are made.  
2. The control performed selected system diagnostic checks immediately upon power up. This  
includes confirming the proper state of the air/gas switches and ECO limit device and powered  
anodes.  
3. If the control determines that the actual water temperature inside the tank is below the programmed  
temperature set-point less the differential, a call for heat is activated.  
4. If all checks are successfully passed, the combustion blower is energized for the pre-purge cycle.  
5. When the pre-purge cycle is complete, power is applied to the igniter element for the igniter warm-  
up period.  
6. At the conclusion of the igniter warm-up period, the gas valve will open, allowing gas to enter the  
burner chamber.  
7. The igniter will remain on for a short predetermined time period, then will be turned off.  
8. The control will monitor the flame sense probe to confirm a flame is present. If a flame is not verified  
within predetermined time period, the gas valve will immediately be closed, and the blower will  
continue to run for approximately 30 seconds inter-purge. The control will try for ignition two more  
times before lockout.  
9. If a flame is confirmed, the control will enter the heating mode where it will continue heating the tank  
water until the set point temperature plus differential is reached. At this point, the gas valve is closed  
and the control enters the post-purge cycle.  
10. The combustion blower will run for the duration of the post purge cycle to purge the system of all  
combustion gases. When the post purge cycle is complete, the blower is de-energized and will  
coast to a stop.  
11. The control will now enter the idle state while  
continuing to monitor the internal tank water  
temperature and the state of other system  
devices. If the temperature drops below the  
set-point value less differential, the control will  
automatically return to step 2 and repeat the  
entire operating cycle.  
28  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
CONTROL SEQUENCE FLOW CHART  
29  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
CONTROLS – CENTRAL CONTROL BOARD – CCB  
The Central Control Board or CCB is contained in the housing shown below. Access to the board and the  
wiring harness plugs can be accomplished by removing two Phillips screws holding the cover.  
Remove these  
screws to release  
cover  
The CCB is controlled by the settings given through the desk top menu (UIM). The CCB also monitors all  
pressure switches, the hot surface ignitor, tank temperatures, the gas valve, the anodes, and the flame  
sensor.  
The CCB directly controls blower speed on the SUF 199 and 250 models and indirectly controls blower  
speed on the SUF 400 and 500 by means of a Variable Frequency Drive (see page 43).  
Note: Improper operation may be the result of a loose connection. Please check all wiring connections and  
the power supply to the water heater.  
This view shows the cover removed from the CCB.  
30  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
This is the back of the UIM.  
31  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
CONTROLS – GAS VALVE SUF 120  
The gas control valve on the SUF 120 has a built-in adjustable pressure regulator. The adjustment screw is  
accessed by removing the cap screw market regulator in the illustration.  
Inlet gas pressure may be read at the inlet pressure tap only if the manual shut off valve (gas cock) is in  
the “ON” position. Leaving the knob in the “OFF” position will not allow the burner to fire and will generate a  
fault code on the UIM (Universal Interface Module).  
CONTROLS – GAS VALVE SUF 150  
The gas control valve on the SUF 150 has a built-in pressure regulator. The regulator may be adjusted by  
removing the cap screw marked “regulator” in the illustration.  
Inlet gas pressure may be read at the inlet pressure tap only if the manual switch is set to the “ON”  
position.  
32  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
CONTROLS – GAS VALVE SUF 199 AND 250  
ADJUSTMENT PROCEDURE: GAS PRESSURE SUF 199 AND 250 MODELS  
IMPORTANT NOTE  
THE SUF 199 AND 250 MODELS INCORPORATE A NEW GAS CONTROL, WHICH OPERATES AT  
A MANIFOLD PRESSURE OF 0" w.c. (0 kPa) FOR BOTH NATURAL AND PROPANE GAS. SEE  
THE GAS PRESSURE CHART ON PAGE 4. THESE MODELS ARE CONFIGURED PRIOR TO BEING  
SHIPPED FROM THE FACTORY AND NO ADJUSTMENTS ARE NECESSARY PRIOR TO STARTUP.  
THE CONTROLLER MONITORS THE AIR FLOW AND MAKES ADJUSTMENTS TO THE FAN SPEED  
WHICH IN EFFECT CONTROLS THE AMOUNT OF GAS FLOW. 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. (2.95 kPa) for natural  
gas, or 14" w.c. (3.45 kPa) for propane. The minimum supply gas pressure is 4" w.c. (.98 kPa) for natural  
gas and 9" w.c. (2.22 kPa) for propane gas.”  
A supply gas pressure regulator (service regulator) must be installed on the gas supply line within  
10' (305 cm) of the unit.  
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.  
Venturi  
Gasket  
w/o orifice  
Gas Control without Orifice Natural Gas  
Venturi  
Gasket  
w/LP Gas  
Orifice  
(.230"  
Brass)  
Gas Control with .230" LP Orifice  
33  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
CONTROLS – GAS VALVE SUF 199 AND 250  
Pressure readings may be taken on the gas valve by connecting to the pressure ports on the valve. The  
manifold pressure on this valve is 0" WC (0 kPa) when the water heater is running. Refer to the gas  
pressure chart on page 4.  
Note: Tubing shown on pressure connections is installed for manometer connections. It is not supplied  
with the water heater.  
WARNING: Do not attempt adjustments on this gas valve unless you have a combustion analyzer.  
Contact the “help line” listed on the water heater for assistance.  
34  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
CONTROLS – GAS VALVE, ORIFICE CHART – SUF 300/400  
The gas control valve has a built-in field adjustable pressure regulator. The gas valve for the SUF Natural  
gas model is shown below. This is a 24V. solenoid operated gas valve.  
Low Gas  
Pressure  
Switch  
Refer to the replacement parts information at the back of this manual for part numbers for Natural and LP  
gas valves for all SUF 300 and 400 models.  
ORIFICE CHART – SUF 300, 400  
Model  
Natural  
LP  
300  
400  
.274"  
.189"  
.314"  
.219"  
35  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
CONTROLS – GAS VALVE, ORIFICE CHART – SUF 500  
The gas control valve has a built-in field adjustable pressure regulator. The regulator may be adjusted by  
removing the cap screw marked “regulator”. The adjustment screw is underneath. The gas valve for the  
SUF 500 Natural gas model is shown below. This is a 24V. solenoid operated gas valve.  
For Series 100 and 101:  
For Series 104:  
ORIFICE CHART – SUF 500  
Series  
Natural  
LP  
100/101  
.347"  
104  
No Orifice  
.241"  
.241"  
36  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
CONTROLS – PRESSURE SWITCHES – ALL MODELS  
All SUF models are provided with four pressure switches. These switches are essential to the safe and  
proper operation of the unit. The switches are wired to the central control board (CCB) individually and  
each is monitored individually. The (CCB) is set up to shut the unit down whenever there is a failure of any  
of the switches and declare a fault for each individual switch. It is important to understand the purpose of  
each switch.  
Low Gas Pressure  
Switch  
Pressure  
Switches  
BLOWER PROVING SWITCH  
The Blower Proving Switch is provided on the heater to verify that the fan is operating. It is a positive  
pressure switch whose electrical contacts are normally open. The blower proving switch electrical  
contacts will close on a rise in pressure as the blower increases the pressure in the burner. This switch  
is connected to the burner tap by a piece of Tygon (soft plastic) tubing. This tubing must be connected in  
order for the switch to close the electrical contacts. The controller requires that the electrical contacts on  
this pressure switch be open before it will allow the blower to come on. The control will declare a fault on  
the UIM if either condition occurs.  
BLOCKED OUTLET PROVING SWITCH  
The blocked outlet proving switch electrical contacts are normally closed. The blocked outlet proving  
switch electrical contacts will open on a rise in pressure. Check to see if the condensate is allowed to  
flow freely from the exhaust elbow and for obstructions in the exhaust venting and exhaust vent terminal.  
Also check that the equivalent feet of vent pipe for the specific model has not been exceeded. Check the  
vent length tables on page 11.  
BLOCKED INLET PROVING SWITCH  
The Blocked Inlet Proving switch electrical contacts are normally closed. The blocked inlet proving switch  
electrical contacts will open when an increase in negative pressure (vacuum) occurs in the intake  
vent pipe. The switch is connected to the pressure tap on the PVC flange connected to the inlet of the  
blower. When this switch prevents the unit from igniting, most likely the intake is blocked by some means.  
Verify that the air intake pipe and air intake vent terminal are free of obstructions that may prevent air  
from entering the unit. Also check that the equivalent feet of vent pipe for the specific model has not been  
exceeded. Check the vent length tables on page 11.  
LOW GAS PRESSURE SWITCH  
The Low Gas Pressure Switch electrical contacts are normally open. The low gas pressure switch  
electrical contacts will close on a rise pressure. The contacts will open when the pressure falls below  
the fixed set point. If this happens during a heating cycle the burner will be shut down and a fault will be  
declared on the UIM.  
37  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
CONTROLS – PRESSURE SWITCHES – SUF 120 THROUGH 250  
Note: Check the website www.statewaterheaters.com for Technical Bulletin S023-06 “Air Pressure  
Switches” under “Literature/Service Handbooks”  
38  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
CONTROLS – PRESSURE SWITCHES – SUF 300, 400, 500  
Note: Check the website www.statewaterheaters.com for Technical Bulletin S023-06 “Air Pressure  
Switches” under “Literature/Service Handbooks”  
39  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
CONTROLS – CONNECTIONS, IGNITER, FLAME SENSOR, SIGHT GLASS,  
POWERED ANODES  
The connections for the hot surface igniter and the flame sense rod are shown below. Also shown is the  
burner sight glass. These features are typical for all models.  
Flame  
Sensor  
Hot Surface  
Igniter  
Mounting Bolts  
Burner sight glass  
The new Ultra Force commercial water heater is equipped with powered anodes. These anodes never  
need replacement. The CCB monitors the current through the anodes and will declare a fault if there is a  
disconnected wire or if there is no water in the tank.  
Powered anode connection  
40  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
HOT SURFACE IGNITER / FLAME SENSOR / CONTROL TIMING  
HOT SURFACE IGNITER  
This water heater is equipped with an electric hot surface igniter. The igniter material is silicone carbide and  
should not be handled with bare hands because of possible damage to the igniter.  
The normal ohm reading at 77°F is listed between 40 and 70 ohms. The minimum igniter current monitored  
by the CCB is 2.7 amps. Once this threshold is met a check mark will appear by the igniter icon in the UIM  
(display).  
FLAME SENSOR  
This water heater is equipped with an electronic flame sensor. The flame sensor senses flame by passing  
a small electric current through the burner flame. This type of flame sensing is also known as flame  
rectification. The CCB is looking for a minimum current of .7 micro amperes for the water heater to operate.  
Once this current is established the UIM will display a flame icon.  
CONTROL TIMING  
Pre-purge  
25 seconds  
17 seconds  
5 seconds  
Igniter Warm-up  
Trial for ignition Gas  
Control Open  
Inter/Post Purge  
30 seconds  
41  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
BLOWER SPEED CONTROL SUF 199 AND 250  
The input of the SUF 199 and SUF 250 is determined by blower. The input of the water heater may be  
determined by clocking the meter as shown on page 5 or by making sure the blower is receiving the proper  
signal. The blower rpm is controlled by the Central Control Board (CCB). The rpm of the blower may be  
measured by attaching a MULTIMETER that has a Hertz (Hz) setting as shown in the illustration below. If  
the Hz signal is within +/-5% of the numbers in the chart below the reading is normal.  
Model  
199 N  
High Speed Hz  
Low Speed Hz  
133  
133  
200  
266  
87  
87  
250 N  
199 LP  
250 LP  
156  
96  
Note: Removing the plug shown in the illustration will cause the blower to accelerate and the input of the  
water heater to increase to a much higher rate. This may cause damage to the water heater.  
Meter black lead is connected to ground (not shown) and the red lead is connected to an open terminal on  
blower speed control connection.  
Meter red probe  
connected to open  
terminal on plug  
42  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
VARIABLE FREQUENCY DRIVE – SUF 400 AND 500  
The Ultra Force SUF 400 and 500 models have a variable frequency drive (VFD) that controls the rpm  
of the blower motor. The VFD receives a signal from the central control board that instructs the VFD to  
transmit the proper frequency to the blower to produce the proper blower speed and proper input.  
Three conditions must be met for the frequency drive to start the blower:  
1. 120VAC must be supplied to the VFD 120VAC input.  
2. The ignition control board closes an enable circuit – terminals LI1 and +15V  
3. The ignition control board sends a 1-10VDC instruction – terminals 0V and AI1. See table on the  
next page for voltage and frequency information.  
43  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
VARIABLE FREQUENCY DRIVE – BLOWER SPEED AND PRESSURE READINGS  
The instructions for the VFD are sent from the CCB to in the form of a DC current. The chart below lists the  
current readings, the frequency signal displayed by the VFD, and the pressure switch settings needed for  
the CCB to let the burner operate. The frequency numbers displayed may vary slightly with slight variations  
in the DC voltage generated by the CCB. If the water heater exhibits poor run characteristics check the  
frequency display. If the frequency is more than 5% out of range, check the DC volt signal at the terminals  
shown on page 43.  
Voltage – Frequency – Speed Instructions – VFD  
Model  
SUF 400  
SUF 500  
Instructions Volts DC  
Terminals OV and AI1  
0 - 10 VDC  
0 - 10 VDC  
Volts  
7.77  
7.53  
7.77  
Frequency  
150 Hz+/-2  
150 Hz+/-2  
150 Hz+/-2  
Pressure w.c. "  
5.85"  
Volts  
7.77  
9.10  
9.84  
Frequency  
150 Hz+/-2  
181 Hz  
Pressure w.c. "  
Purge Speed  
Ignition speed  
High speed  
5.85"  
7.2"  
5.3"  
5.85"  
196 Hz  
9.0"  
VFD Part Number  
197500-000  
Frequency is displayed  
in the red LED. 155 Hz  
44  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
WIRING DIAGRAM – SUF 120 ‑ 300  
LOW GAS  
PRESSURE SWITCH  
24 VAC  
GAS VALVE  
BLOCKED  
AIR INTAKE  
BLOWER  
PROVER  
BLOCKED  
EXHAUST  
1
13  
2
15  
4
14  
5
10  
6
7
8
11  
ENABLE/DISABLE CIRCUIT  
JUMPER WIRE BETWEEN PINS  
8 AND 11 ON J6 PLUG  
HOT SURFACE IGNITER  
1 BLACK  
2 WHITE  
FLAME SENSOR  
UPPER TEMPERATURE PROBE  
LOWER TEMPERATURE PROBE  
RED  
1 RED (ECO)  
2 BLACK  
3 BLACK  
4 RED (ECO)  
1 BLACK  
2 BLACK  
ANODE 1  
ANODE 2  
1 GREEN  
2 BLUE  
120 VAC 1 Ø POWER  
1
2
1 BLACK  
2 WHITE  
COMBUSTION  
BLOWER  
1
2 RED  
GREEN  
WHITE  
2
3
GREEN  
WHITE  
GROUND  
GREEN  
120 VAC NEUTRAL  
120 VAC HOT  
N
L
BLACK  
RED  
1 BLACK120 VAC HOT  
ON/OFF  
SWITCH  
BLACK  
WHITE  
3 WHITE 120 VAC NEUTRAL  
4 YEL 24 VAC  
4 YEL 24 VAC  
GROUND STRIP  
BURNER GROUND  
(BURNER BOLT)  
TRANSFORMER  
50VA  
INSIDE CCB  
ENCLOSURE  
45  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
WIRING DIAGRAM – SUF 400, 500  
LOW GAS  
PRESSURE SWITCH  
24 VAC  
GAS VALVE  
BLOCKED  
INTAKE AIR  
BLOWER  
PROVER  
BLOCKED  
EXHAUST  
1
13  
2
15  
4
14  
5
10  
6
7
8
11  
ENABLE/DISABLE CIRCUIT  
JUMPER WIRE BETWEEN PINS  
8 AND 11 ON J6 PLUG  
HOT SURFACE IGNITER  
FLAME SENSOR  
1 BLACK  
2 WHITE  
RED  
1 RED (ECO)  
2 BLACK  
3 BLACK  
UPPER TEMPERATURE PROBE  
LOWER TEMPERATURE PROBE  
4 RED (ECO)  
1 BLACK  
2 BLACK  
ANODE 1  
ANODE 2  
1 GREEN  
2 BLUE  
WHITE/BLACK  
AI1  
WHITE/GREEN  
0V  
WHITE  
WHITE/YELLOW  
NOTE: COMBUSTION BLOWER MOTORS  
ON 400,000 & 500,000 Btu/hr MODELS ARE  
THREE PHASE (3Ø) MOTORS.  
1
2
+15V  
L l1  
VFD  
VARIABLE  
FREQUENCY  
DRIVE  
BLACK, WHITE AND RED WIRES MUST BE  
WIRED AS SHOWN OR THE MOTOR WILL  
TURN BACKWARDS. THIS MAY CAUSE THE  
CONTROL SYSTEM TO LOCK OUT ON  
“BLOWER PROVER OPEN” FAULT.  
5
6
BLACK  
GREEN  
BLACK  
WHITE  
WHITE  
RED  
COMBUSTION  
BLOWER  
1
RED  
GREEN  
2
3
GREEN  
WHITE  
GREEN  
GROUND  
GREEN  
WHITE  
120 VAC NEUTRAL  
N
L
BLACK  
1 BLACK120 VAC HOT  
RED  
ON/OFF  
SWITCH  
BLACK  
120 VAC HOT  
WHITE  
3 WHITE 120 VAC NEUTRAL  
4 YEL 24 VAC  
4 YEL 24 VAC  
GROUND STRIP  
BURNER GROUND  
(BURNER BOLT)  
TRANSFORMER  
50VA  
INSIDE CCB  
ENCLOSURE  
46  
Servicing should only be performed by a Qualified Service Agent  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
COMMERCIAL GAS HIGH EFFICIENCY WATER HEATERS  
500 Tennessee Waltz Parkway  
Ashland City, TN 37015  
Download from Www.Somanuals.com. All Manuals Search And Download.  

Sierra Products Stove EF 4001B User Manual
SMSC Network Card EVB EMC1033 User Manual
Snapper Pressure Washer 1807 1 User Manual
Sony Clock Radio ICF C153L User Manual
Sony Crib XSP N1BT User Manual
Sony Security Camera SNCVM600 User Manual
Sony Speaker SA 32SE1 User Manual
Speed Queen Computer Monitor NX18 User Manual
StarTechcom TV Mount RK1219WALHM User Manual
SUPER MICRO Computer Network Card 6014P TR User Manual