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
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GAS PRESSURE SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION QUICK TIPS – SUF 120 AND 150 GAS PRESSURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
INSTALLATION QUICK TIPS – SUF 199 AND 250 GAS PRESSURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
INSTALLATION QUICK TIPS – SUF 300, 400, 500. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
INSTALLATION – VENTING CATEGORY AND MATERIALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
VENT CONDENSATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
VENT TERMINATION – DIRECT VENT – ALL MODELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
DIRECT VENTING – ALL MODELS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
CHANGING THE DISPLAY UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
FAULT CODES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
CONTROL SEQUENCE FLOW CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
CONTROLS – CENTRAL CONTROL BOARD – CCB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
VARIABLE FREQUENCY DRIVE – SUF 400 AND 500. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
WIRING DIAGRAM – SUF 120 - 300. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
1
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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-
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.
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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
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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
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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 = ?
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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.
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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.
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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
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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.
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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
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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
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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:
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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:
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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:
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ACTION:
Press Update to accept the change or Cancel to reject it.
DISPLAY:
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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.
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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:
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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)
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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.
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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.
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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.
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This is the back of the UIM.
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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.
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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
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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.
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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"
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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"
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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.
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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
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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
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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
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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.
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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
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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
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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
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COMMERCIAL GAS HIGH EFFICIENCY WATER HEATERS
500 Tennessee Waltz Parkway
Ashland City, TN 37015
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