State Water Heaters SBD85500NE User manual

COMMERCIAL GAS WATER HEATERS
Instruction Manual
PRINTED IN THE U.S.A. 0510 318298-000
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
Thank you for buying this energy efficient water heater.
We appreciate your confidence in our products.
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.
MODELS SBD85500NE &
SBD85500PE
SERIES 120/121
INSTALLATION - OPERATION - SERVICE
- MAINTENANCE - LIMITED WARRANTY
ANSI / NSF 5
ASME CRN
WARNING: If the information in these
instructions is not followed exactly, a fire
or explosion may result causing property
damage, personal injury or death.
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS:
Do not try to light any appliance.
Do not touch any electrical switch; do
not use any phone in your building.
Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
If you cannot reach your gas supplier,
call the fire department.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
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500 Tennessee Waltz Pkwy
Ashland City, TN 37015

2
Water Line Connections .................................................................. 19
Water (Potable) Heating and Space Heating............................................19
Thermometer (Not Supplied) ....................................................................19
Water Piping Diagrams.............................................................................19
T&P Valve Discharge Pipe............................................................... 19
Installation Diagrams ....................................................................... 20
Code Restrictions ............................................................................ 20
Heater Wiring................................................................................... 21
Gas Piping ....................................................................................... 22
Purging ............................................................................................ 22
Gas Pressure Regulator .................................................................. 22
OPERATION......................................................................................... 23
General............................................................................................ 23
Filling ............................................................................................... 23
Adjustments..................................................................................... 23
SEQUENCE OF OPERATION ............................................................. 23
Lighting & Operation Label .............................................................. 24
Checking Venting............................................................................. 25
Checking the Igniter Assembly ........................................................ 25
Igniter Assembly .............................................................................. 25
Main Burner ..................................................................................... 25
Gas Valves....................................................................................... 25
Checking the Input........................................................................... 26
MAINTENANCE ................................................................................... 26
Venting System................................................................................ 26
Remote Storage Tank Temperature Control .................................... 26
Temperature-Pressure Relief Valve Test ......................................... 26
Hot Water Odor................................................................................ 27
Anode Rod Inspection ..................................................................... 27
Draining and Flushing...................................................................... 27
To Drain the Water Heater Storage Tank..................................................27
To Flush the Water Heater Storage Tank..................................................27
Recommended Procedure for Periodic Removal or Lime Deposits
from the Tank Type\ Commercial Water Heaters ............................. 28
DeLiming Solvents........................................................................... 28
Tank Cleanout Procedure ........................................................... 28-29
Ignition Module System ................................................................... 29
SERVICE.............................................................................................. 29
Electrical Servicing .......................................................................... 29
FOR YOUR INFORMATION................................................................. 30
Start up Conditions .......................................................................... 30
Operational Conditions .................................................................... 30
"Air" in the Water Faucets.........................................................................30
High Water Temperature Shut off System ................................................30
Sequence of Operation Flow Chart ................................................. 31
Operational Checklist ...................................................................... 32
WATER PIPING DIAGRAMS........................................................... 33-47
WARRANTY ......................................................................................... 48
TABLE OF CONTENTS
SAFE INSTALLATION, USE AND SERVICE.......................................... 3
GENERAL SAFETY INFORMATION................................................... 4-5
Precautions........................................................................................ 4
INTRODUCTION.................................................................................... 6
Qualifications ..................................................................................... 6
FEATURES AND COMPONENTS ......................................................... 7
The Eliminator (Self Cleaning System).............................................. 7
High Limit Switch ............................................................................... 7
Electronic Ignition Control.................................................................. 7
Exhaust Inducer (blower Assy.) ......................................................... 7
Uncrating ........................................................................................... 7
INSTALLATION CONSIDERATIONS ................................................ 8-11
Rough In Dimensions ........................................................................ 8
Recovery Capacities.......................................................................... 8
Gas and Electrical Characteristics..................................................... 8
Locating The Water Heater................................................................ 9
Leveling ............................................................................................. 9
Clearances ........................................................................................ 9
Installation on Combustible Flooring ............................................... 10
Insulation Blanket ............................................................................ 10
Hard Water ...................................................................................... 10
Circulation Pumps ...................................................................... 10-11
INSTALLATION REQUIREMENTS ................................................. 11-14
Supply Gas Regulator ......................................................................11
Power Supply ...................................................................................11
Mixing Valves....................................................................................11
Dishwashing Machines.................................................................... 12
Closed Water Systems .................................................................... 12
Thermal Expansion.......................................................................... 12
Temperature-Pressure Relief Valve ............................................ 12-13
Contaminated Air ............................................................................. 13
Air Requirements............................................................................. 13
Unconfined Space ........................................................................... 14
Confined Space ............................................................................... 14
Exhaust Fans............................................................................................14
Louvers and Grilles...................................................................................14
Vent Reducer................................................................................... 14
VENTING INSTALLATION .............................................................. 14-18
Venting............................................................................................. 14
Multiple Heater Manifold.................................................................. 15
Fresh Air Opening for Confined Spaces .......................................... 15
Outdoor Air Through Two Openings ................................................ 15
Outdoor Air Through One Opening.................................................. 15
Outdoor Air Through Two Horizontal Ducts ..................................... 15
Outdoor Air Through Two Vertical Ducts.......................................... 16
Air From Other Indoor Spaces......................................................... 16
Technical Data Venting ............................................................... 17-18
WATER HEATER INSTALLATION................................................... 19-22

3
SAFE INSTALLATION, USE AND SERVICE
The proper installation, use and servicing of this water heater is extremely important to your safety and the safety of others.
Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and
others of a potential injury hazard. Read and obey all safety messages and instructions throughout this manual. It is very important
that the meaning of each safety message is understood by you and others who install, use, or service this water heater.
All safety messages will generally tell you about the type of hazard, what can happen if you do not follow the safety message, and
how to avoid the risk of injury.
The California Safe Drinking Water and Toxic Enforcement Act requires the Governor of California to publish a list of substances
known to the State of California to cause cancer, birth defects, or other reproductive harm, and requires businesses to warn of
potential exposure to such substances.
This product contains a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm. This
appliance can cause low level exposure to some of the substances listed in the Act.
DANGER
WARNING
CAUTION
CAUTION
DANGER indicates an imminently
hazardous situation which, if not avoided,
will result in injury or death.
This is the safety alert symbol. It is used to alert you to
potential personal injury hazards. Obey all safety
messages that follow this symbol to avoid possible
injury or death.
WARNING indicates a potentially hazardous
situation which, if not avoided, could result
in injury or death.
CAUTION indicates a potentially hazardous
situation which, if not avoided, could result in
minor or moderate injury.
CAUTION used without the safety alert
symbol indicates a potentially hazardous
situation which, if not avoided, could result in
property damage.
ASME CRN ANSI / NSF 5
APPROVALS

4
GENERAL SAFETY INFORMATION
Fire Hazard
Do not install water heater on
carpeted floor.
Do not operate water heater if
flood damaged.
For continued protection against
risk of fire:
Fire or Explosion Hazard
Read instruction manual before
installing, using or servicing
water heater.
Avoid all ignition sources if you smell gas.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
Use only the gas shown on the water heater rating label.
Keep ignition sources away from faucets after extended
periods of non-use.
Maintain required clearances to combustibles.
Do not expose water heater controls to excessive gas
pressure.
Do not obstruct water heater air intake
with insulating blanket.
Gas and carbon monoxide detectors
are available.
Install water heater in accordance with
the instruction manual.
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.
Breathing Hazard - Carbon Monoxide Gas
Property Damage Hazard
All water heaters eventually leak.
•
Do not install without adequate drainage.
•
CAUTION
Fire and Explosion Hazard
Leak test before placing the
water heater in operation.
Disconnect gas piping and main
gas shutoff valve before leak
testing.
Install sediment trap in
accordance with NFPA 54.
Use joint compound or Teflon tape
compatible with propane gas.
Fire and Explosion Hazard
Turn off gas lines during installation.
Contact a qualified installer or service
agency for installation and service.
Excessive gas pressure to gas valve can
cause serious injury or death.
Do not use water heater with any gas
other than the gas shown on the rating
label.
Turn off power to the water heater
before performing any service.
Electrical Shock Hazard
•
Label all wires prior to disconnecting
when performing service. Wiring errors
can cause improper and dangerous
operation.
•
Verify proper operation after servicing.
•
Failure to follow these instructions can
result in personal injury or death.
•
Jumping out control circuits or components can
result in property damage, personal injury or death.
Service should only be performed by a qualified service
agent using proper test equipment.
•
Altering the water heater controls and/or wiring in any way
could result in permanent damage to the controls or water
heater and is not covered under the limited warranty.
•
Any bypass or alteration of the water
heater controls and/or wiring will result
in voiding the appliance warranty.
Altering the water heater controls and/or wiring in any way
could result in altering the ignition sequence allowing gas to
flow to the main burner before the hot surface igniter is at
ignition temperature causing delayed ignition which can
cause a fire or explosion.
•

5
PRECAUTIONS
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN
UNDER WATER. Immediately call a qualified service agency
to inspect the appliance and to make a determination on what
steps should be taken next.
If the unit is exposed to the following, do not operate heater
until all corrective steps have been made by a qualified
service agency.
External fire.1.
Damage.2.
Firing without water.3.
GROUNDING INSTRUCTIONS
This water heater must be grounded in accordance with the
National Electrical Code and/or local codes. These must be
followed in all cases.
This water heater must be connected to a grounded metal,
permanent wiring system; or an equipment grounding conductor
must be run with the circuit conductors and connected to the
equipment grounding terminal or lead on the water heater, see
Figure 20.
HYDROGEN GAS FLAMMABLE
Hydrogen gas can be produced in a hot water system served
by this appliance that has not been used for a long period of
time (generally two weeks or more). Hydrogen gas is extremely
flammable. To reduce the risk of injury under these conditions, it
is recommended that a hot water faucet served by this appliance
be opened for several minutes before using any electrical
appliance connected to the hot water system. If hydrogen is
present there will probably be an unusual sound such as air
escaping through the pipe as the water begins to flow. THERE
SHOULD BE NO SMOKING OR OPEN FLAME NEAR THE
FAUCET AT THE TIME IT IS OPEN.
GENERAL SAFETY INFORMATION
Verify the power to the water heater is turned off before performing any service procedures.
Explosion Hazard
Flammable hydrogen gases
may be present.
Keep all ignition sources away
from faucet when turning on
hot water.
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or
showering.
Temperature limiting devices such as
mixing valves must be installed
when required by codes and to
ensure safe temperatures at fixtures.
Explosion Hazard
Overheated water can cause
water tank explosion.
Properly sized temperature and
pressure relief valve must be
installed in the opening provided.
Improper installation, use and service may result
in property damage.
Do not operate water heater if flood damaged.
•
Inspect and anode rods regularly, replace if damaged.
•
Install in location with drainage.
•
Fill tank with water before operation.
•
Properly sized thermal expansion tanks are required on all
closed water systems.
•
Refer to this manual for installation and service.
CAUTION
GENERAL SAFETY INFORMATION

6
Thank You for purchasing this water heater. Properly installed
and maintained, it should give you years of trouble free service.
ABBREVIATIONS USED
Abbreviations found in this Instruction Manual include :
ANSI - American National Standards Institute•
ASME - American Society of Mechanical Engineers•
GAMA - Gas Appliance Manufacturer’s Association•
NEC - National Electrical Code•
NFPA - National Fire Protection Association•
UL - Underwriters Laboratory•
CSA - Canadian Standards Association•
QUALIFICATIONS
QUALIFIED INSTALLER OR SERVICE AGENCY
Installation and service of this water heater requires ability
equivalent to that of a Qualified Agency (as defined by ANSI
INTRODUCTION
below) in the field involved. Installation skills such as plumbing,
air supply, venting, gas supply and electrical supply are required
in addition to electrical testing skills when performing service.
ANSI Z223.1 2006 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.”
If you are not qualified (as defined by ANSI above) and licensed
or certified as required by the authority having jurisdiction
to perform a given task do not attempt to perform any of the
procedures described in this manual. If you do not understand
the instructions given in this manual do not attempt to perform
any procedures outlined in this manual.

7
THE ELIMINATOR (SELF-CLEANING SYSTEM)
These units include The Eliminator (Self-Cleaning System)
installed in the front water inlet, See Figure 1. The Eliminator
must be oriented correctly for proper function. There is a marked
range on the pipe nipple portion of the Eliminator, that must be
aligned with the top of the inlet spud. A label above the jacket
hole has an arrow that will point to the marked portion of the pipe
nipple if the orientation is correct. If the arrow does not point
within the marked range on the pipe nipple, adjust the pipe nipple
to correct. A pipe union is supplied with the Eliminator to reduce
the probability of misaligning the Eliminator accidentally while
tightening the connection to the inlet water supply line. Improper
orientation of the Eliminator can cause poor performance of the
heater and can significantly reduce outlet water temperatures
during heavy draws.
Note: The inlet tube may have 1, 3 or 7 cross tubes.
FIGURE 1
For proper function, the Eliminator must be oriented correctly.
There is a marked range on the pipe nipple that must be aligned
with the top of the inlet spud (check for label on the appliance)
to assure proper operation. Please check to confirm that
the marked range is in alignment with the top of the spud. A
pipe union is supplied with the Eliminator to help eliminate
the possibility of changing the orientation by accidentally
overtightening the inlet supply. Improper orientation of the
Eliminator may cause temperature buildup issues or spells of
colder than usual water temperatures.
HIGH LIMIT SWITCH
The digital thermostat (Figure 2) contains the high limit (energy
cutoff) sensor. The high limit switch interrupts main burner gas
flow should the water temperature reach 203°F (95°C).
In the event of high limit switch operation, the appliance cannot be
restarted unless the water temperature is reduced to approximately
120°F (49°C). The high limit reset button on the front of the control
then needs to be depressed.
Continued manual resetting of high limit control, preceded by
higher than usual water temperature is evidence of high limit
switch operation. The following is a possible reason for high limit
switch operation:
• A malfunction in the thermostatic controls would allow the gas
valve to remain open causing water temperature to exceed the
thermostat setting. The water temperature would continue to
rise until high limit switch operation.
Contact your dealer or service agent if continued high limit switch
operation occurs.
DIGITAL THERMOSTAT
FIGURE 2
ELECTRONIC IGNITION CONTROL
Each heater is equipped with a ignition module. The solid sate
ignition control (Figure 3), ignites the main burner by utilizing a
silicone nitride ignitor. The silicone nitride ignitor shuts off during
the heating cycle and the main burner flame is sensed through
a remote flame sensor integral to the silicone nitride ignitor
assembly.
The ignition control will try to ignite the main burner three times
before lockout. Then it waits one hour before trying again to ignite
the main burners. This is a continuous cycle.
IGNITION CONTROL BOARD
FIGURE 3
EXHAUST INDUCER (BLOWER ASSY.)
The SBD85500NE/SBD85500PE models are equipped with an
exhaust inducer. The inducer assists in drawing in fresh air to the
unit for combustion and then assists in dispensing the combustion
by-products into the venting leading outside.
The exhaust inducer is equipped with a gravity controlled damper
to reduce the amount of heat loss through the flue, improving
efficiency.
EXHAUST INDUCER
FIGURE 4
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN
SERIOUS PERSONAL INJURY OR DEATH.
UNCRATING
The heater is shipped with the inducer already installed. The
wiring conduit runs from the thermostat to the inducer. Before
turning unit on, check to make sure the wiring conduit is securely
plugged into the inducer.
FEATURES AND COMPONENTS

8
ROUGH IN DIMENSIONS
FRONT VIEW
TOP VIEW
BACK VIEW
TABLE 2. RECOVERY CAPACITIES, based on 80% efficiency
F
TOP
OUTLET
1 1/2” NPT
TOP
INLET
1 1/2” NPT
TABLE 3. GAS AND ELECTRICAL CHARACTERISTICS
TABLE 1. ROUGH-IN-DIMENSIONS
Model
Input Rate
Btu/Hr
Kw/Hr
Approximate
Tank Cap
G/L
Dimensions in Inches/cm Connections Approx. Ship Weight
Inlet (NPT) Outlet (NPT)
ABCDEF
Gas
Inlet
GH
Vent
Dia
IJ
Top Front Back Top Front Back Std.
Lbs/
Kgs.
ASME
Lbs/
Kgs.
SBD85500NE/
SBD85500PE
500,000 85
81.50 17.50 77.25 67.50 27.13 21.00 1.00 67.50 8.00 27.75
1.50 1.50 1.50 1.50 1.50 1.50 745 857
SBD85500NE/
SBD85500PE
147 322
207 44 196 171 69 53 3 171 20 70
1.50 1.50 1.50 1.50 1.50 1.50 338 389
Model
Input Rate
Btu/Hr
Kw/Hr
Approximate
Tank Cap
G/L
Recovery Rating Capacities (GPH and LPH)
30°F 40°F 50°F 60°F 70°F 80°F 90°F 100°F 110°F 120°F 130°F 140°F
(-1)°C 4°C 10°C 15°C 21°C 27°C 32°C 38°C 43°C 49°C 54°C 60°C
SBD85500NE/
SBD85500PE 500,000 85 1616 1212 970 808 693 606 539 485 441 404 373 346
SBD85500NE/
SBD85500PE 147 322 6118 4588 3671 3059 2622 2294 2039 1835 1668 1529 1412 1311
Model Type of Gas Inches of W.C. kPA Volts/Hz Amperes
SBD85500NE/SBD85500PE Natural 3.50" 0.87 120/60 <5
SBD85500NE/SBD85500PE Propane 10.00" 2.48 120/60 <5
INSTALLATION CONSIDERATIONS
FIGURE 5

9
THE HEATER MUST NOT BE LOCATED IN AN AREA WHERE
IT WILL BE SUBJECT TO FREEZING.
LOCATE IT NEAR A FLOOR DRAIN. THE HEATER SHOULD
BE LOCATED IN AN AREA WHERE LEAKAGE FROM THE
HEATER OR CONNECTIONS WILL NOT RESULT IN DAMAGE
TO THE ADJACENT AREA OR TO LOWER FLOORS OF THE
STRUCTURE.
WHEN SUCH LOCATIONS CANNOT BE AVOIDED, A SUITABLE
DRAIN PAN SHOULD BE INSTALLED UNDER THE HEATER.
Such pans should be fabricated with sides at least 2” deep, with
length and width at least 2” greater than the diameter of the heater
and must be piped to an adequate drain. The pan must not restrict
combustion air flow.
LEVELING
If the unit is not level, insert the bolts which were used in crating
into the legs to correct this condition.
CLEARANCES
This water heater is approved for installation on combustible
flooring (with Installation on Combustible Flooring #9003425205)
in an alcove when the minimum clearance from any combustion
construction are followed as indicated in Figure 7 and Table 4.
In all installations the minimum combustible clearances from
vent piping shall be 6” (152mm). Vent piping passing through a
combustible wall or ceiling must be a continuous run (no joints)
and retain the 6” (152mm) clearance unless an approved reducing
thimble is used.
A service clearance of 24” (610mm) should be maintained from
serviceable parts, such as relief valves, flue baffles, thermostats,
cleanout openings or drain valves.
The units are approved for installation with side, rear and ceiling
clearances as indicated below:
TABLE 4
MINIMUM CLEARANCES TO COMBUSTIBLES IN INCHES (mm)
MODEL
"A"
RIGHT
SIDE
"B"
LEFT
SIDE
"C"
BACK
"D"
CEILING
SBD85500NE/
SBD85500PE
5"
(12.7 mm)
5"
(12.7 mm)
5"
(12.7 mm)
20"
(508mm)
TABLE 5
MINIMUM CLEARANCES TO NONCOMBUSTIBLE CONSTRUCTION
MODEL
"A"
RIGHT
SIDE
"B"
LEFT
SIDE
"C"
BACK
"D"
CEILING
SBD85500NE/
SBD85500PE
0 0 0 12"
(305 mm)
LOCATING THE WATER HEATER
Property Damage Hazard
All water heaters eventually leak.
•
Do not install without adequate drainage.
•
CAUTION
When installing the heater, consideration must be given to proper
location. Location selected should be as close to the stack or chimney
as practicable, with adequate air supply and as centralized with the piping
system as possible.
Fire or Explosion Hazard
Read instruction manual before
installing, using or servicing
water heater.
Avoid all ignition sources if you smell gas.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
Use only the gas shown on the water heater rating label.
Keep ignition sources away from faucets after extended
periods of non-use.
Maintain required clearances to combustibles.
Do not expose water heater controls to excessive gas
pressure.
THERE IS A RISK IN USING FUEL BURNING APPLIANCES SUCH AS
GAS WATER HEATERS IN ROOMS, GARAGES OR OTHER AREAS
WHERE GASOLINE, OTHER FLAMMABLE LIQUIDS OR ENGINE
DRIVEN EQUIPMENT OR VEHICLES ARE STORED, OPERATED OR
REPAIRED. FLAMMABLE VAPORS ARE HEAVY AND TRAVEL ALONG
THE FLOOR AND MAY BE IGNITED BY THE HEATER’S PILOT OR MAIN
BURNER FLAMES CAUSING FIRE OR EXPLOSION. SOME LOCAL
CODES PERMIT OPERATION OF GAS APPLIANCES IN SUCH AREAS
IF THEY ARE INSTALLED 18” OR MORE ABOVE THE FLOOR. THIS
MAY REDUCE THE RISK IF LOCATION IN SUCH AN AREA CANNOT
BE AVOIDED.
DO NOT INSTALL THIS WATER HEATER DIRECTLY ON A CARPETED
FLOOR. A FIRE HAZARD MAY RESULT. Instead the water heater must
be placed on a metal or wood panel extending beyond the full width and
depth by at least 3 inches in any direction. If the heater is installed in a
carpeted alcove, the entire floor shall be covered by the panel. Also, see
the DRAINING requirements in MAINTENANCE Section.
THE HEATER SHALL BE LOCATED OR PROTECTED SO IT IS NOT
SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.
FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY
OTHER POTENTIAL FIRE HAZARDOUS ARTICLES MUST
NEVER BE PLACED ON OR ADJACENT TO THE HEATER.
OPEN CONTAINERS OR FLAMMABLE MATERIAL SHOULD
NOT BE STORED OR USED IN THE SAME ROOM WITH THE
HEATER.
INSTALLATION CONSIDERATIONS

10
INSULATION BLANKET
Do not obstruct water heater air intake
with insulating blanket.
Gas and carbon monoxide detectors
are available.
Install water heater in accordance with
the instruction manual.
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.
Breathing Hazard - Carbon Monoxide Gas
Insulation blankets are available to the general public for external
use on gas water heaters but are not necessary with these
products. The purpose of an insulation blanket is to reduce the
standby heat loss encountered with storage tank heaters. The
water heaters covered by this manual meet or exceed the Energy
Policy Act standards with respect to insulation and standby heat
loss requirements, making an insulation blanket unnecessary.
Should you choose to apply an insulation blanket to this
heater, you should follow these instructions. See the Features
and Components section of this manual for identification of
components mentioned below. Failure to follow these instructions
can restrict the air flow required for proper combustion, potentially
resulting in fire, asphyxiation, serious personal injury or death.
DO NOT• apply insulation to the top of the water heater, as
this will interfere with safe operation of the draft hood.
DO NOT• cover the gas valve, thermostat or the Temperature-
Pressure Relief Valve.
DO NOT• allow insulation to come within 2” (5 cm) of the
burners, to prevent blockage of combustion air flow to the
burners.
DO NOT• allow insulation to come within 9 inches (23 cm)
of floor, (within 2 inches (5 cm) of bottom cover) to prevent
blockage of combustion air flow to the burners..
DO NOT• cover the instruction manual. Keep it on the side of
the water heater or nearby for future reference.
DO• obtain new warning and instruction labels from the
manufacturer for placement on the blanket directly over the
existing labels.
DO• inspect the insulation blanket frequently to make certain
it does not sag, thereby obstructing combustion air flow.
HARD WATER
Where hard water conditions exist, water softening or the
threshold type of water treatment is recommended. This will
protect the dishwashers, coffee urns, water heaters, water piping
and other equipment.
See the Maintenance Section in this manual for sediment and
lime scale removal procedures.
CIRCULATION PUMPS
A circulating pump is used when a system requires a circulating
loop or there is a storage tank used in conjunction with the water
heater. See Water Piping Diagrams in this manual for installation
location of circulating pumps.
See the Circulation Pump Wiring Diagrams in this manual for
electrical hookup information. Install in accordance with the
current edition of the National Electrical Code, NFPA 70 or the
Canadian Electrical Code, CSA C22.1.
All-bronze circulators are recommended for used with commercial
water heaters.
.
FIGURE 6
INSTALLATION ON COMBUSTIBLE FLOORING
The SBD85500NE/SBD85500PE is approved for installations
on combustible flooring when installed with leg kit number
9003425205.
FIGURE 7
Unit needs to be lifted in a way not to damage unit or laid1.
on it’s side to access the bottom of the legs.
Slide leg extension under leg and the bolt up through the2.
bottom hole located in the bottom of the leg.
Once in place, screw nut down and secure.3.
Front of leg should line up with front of leg extension as4.
shown to make sure weight of unit is distributed through the
leg extension.

11
Water heated to a temperature which will satisfy clothes washing,
dish washing, and other sanitizing needs can scald and cause
permanent injury upon contact. Short repeated heating cycles
caused by small hot water uses can cause temperatures at the
point of use to exceed the water heater’s temperature setting by
up to 20°F (11°C).
Some people are more likely to be permanently injured by
hot water than others. These include the elderly, children, the
infirm and the physically/mentally disabled. Table 6 shows the
approximate time-to-burn relationship for normal adult skin.
If anyone using hot water provided by the water heater being
installed fits into one of these groups or if there is a local code
or state law requiring a certain water temperature at the point of
use, then special precautions must be taken.
In addition to using the lowest possible temperature setting that
satisfies the demand of the application a Mixing Valve should be
installed at the water heater (see Figure 10) or at the hot water
taps to further reduce system water temperature.
Mixing valves are available at plumbing supply stores. Consult
a Qualified Installer or Service Agency. Follow mixing valve
manufacturer’s instructions for installation of the valves.
TABLE 6
Water Temperature Time to Produce 2nd & 3rd
Degree Burns on Adult Skin
180°F (82°C) Nearly instantaneous
170°F (77°C) Nearly instantaneous
160°F (71°C) About 1/2 second
150°F (66°C) About 1-1/2 seconds
140°F (60°C) Less than 5 seconds
130°F (54°C) About 30 seconds
120°F (49°C) More than 5 minutes
CIRCULATING PUMP WIRING DIAGRAM
DISHWASHER LOOP WITH TOGGLE SWITCH
FIELD SUPPLIED TEMPERATURE
CONTROL INSTALLED IN THE
CIRCULATING LOOP RETURN LINE
DISHWASHER
TOGGLE
SWITCH
CIRC
PUMP
MOTOR
L1 HOT
L2 NEUTRAL
120 VAC
POWER
NOTE: USE SEPARATE 120 VAC POWER
SUPPLY FOR PUMP CIRCUIT. DO NOT
SHARE POWER WITH APPLIANCE AS THIS
MAY CAUSE ELECTRICAL LINE NOISE AND
LEAD TO ERRATIC CONTROL SYSTEM
OPERATION.
FIGURE 9
Some circulating pumps are manufactured with sealed bearings
and do not require further lubrication. Some circulating pumps
must be periodically oiled. Refer to the pump manufacturer’s
instructions for lubrication requirements.
CIRCULATING PUMP WIRING DIAGRAM
STORAGE TANK OR BUILDING RECIRCULATION
FIELD SUPPLIED TEMPERATURE CONTROL
INSTALLED IN THE STORAGE TANK
OR CIRCULATING LOOP RETURN LINE
CIRC
PUMP
MOTOR
L1 HOT
L2 NEUTRAL
120 VAC
POWER
NOTE: USE SEPARATE 120 VAC POWER
SUPPLY FOR PUMP CIRCUIT. DO NOT
SHARE POWER WITH APPLIANCE AS THIS
MAY CAUSE ELECTRICAL LINE NOISE AND
LEAD TO ERRATIC CONTROL SYSTEM
OPERATION.
FIGURE 8
SUPPLY GAS REGULATOR
The water heater covered by this manual requires a supply gas
regulator to be installed in the supply gas line serving the water
heater for proper operation. Supply gas regulators are required
on high and low pressure gas supply systems.
NOTE: On multiple water heater installations each water heater
shall have its own dedicated supply gas regulator installed in the
supply gas line serving the water heater.
Supply gas regulators must be rated at or above the input Btu/
hr rating of the water heater they supply. Supply gas regulators
shall have inlet and outlet connections not less than the minimum
supply gas line size for the water heater they serve as shown in
Table 5. The Maxitrol 325-7L or equivalent is recommended.
See Supply Gas Regulator Installation on page 11.
POWER SUPPLY
The water heaters covered in this manual require a 120 VAC,
1Ø (single phase), 60Hz, 15 amp power supply and must also
be electrically grounded in accordance with local codes or, in the
absence of local codes, with the National Electrical Code, ANSI/
NFPA 70 or the Canadian Electrical Code, CSA C22.1.
MIXING VALVES
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or
showering.
Temperature limiting devices such as
mixing valves must be installed
when required by codes and to
ensure safe temperatures at fixtures.
INSTALLATION REQUIREMENTS

12
DISHWASHING MACHINES
All dishwashing machines meeting the National Sanitation
Foundation requirements are designed to operate with water flow
pressures between 15 and 25 pounds per square inch (103 kPa
and 173 kPa). Flow pressures above 25 pounds per square inch
(173 kPa), or below 15 pounds per square inch (103 kPa), will
result in improperly sanitized dishes. Where pressures are high,
a water pressure reducing or flow regulating control valve should
be used in the 180°F (82°C) line to the dishwashing machine
and should be adjusted to deliver water pressure between these
limits.
HOT WATER
OUTLET
TO TANK
INLET
CHECK
VALVE
MIXING
VALVE
COLD
WATER
INLET
TEMPERED WATER
OUTLET
12” TO 15”
(30-38 cm)
CHECK
VALVE
Figure 10
The National Sanitation Foundation also recommends circulation
of 180°F (82°C) water. Where this is done, the circulation should
be very gentle so that it does not cause any unnecessary
turbulence inside the water heater. The circulation should be just
enough to provide 180°F (82°C) water at the point of take-off to
the dishwashing machine.
Adjust flow by throttling a full port ball valve installed in the
circulating line on the outlet side of the pump. Never throttle flow
on the suction side of a pump. See Water Piping Diagrams in
this manual.
CLOSED WATER SYSTEMS
Water supply systems may, because of code requirements
or such conditions as high line pressure, among others, have
installed devices such as pressure reducing valves, check
valves, and back flow preventers. Devices such as these cause
the water system to be a closed system.
THERMAL EXPANSION
As water is heated, it expands (thermal expansion). In a closed
system the volume of water will grow when it is heated. As the
volume of water grows there will be a corresponding increase
in water pressure due to thermal expansion. Thermal expansion
can cause premature tank failure (leakage). This type of failure
is not covered under the limited warranty. Thermal expansion
can also cause intermittent Temperature-Pressure Relief Valve
operation: water discharged from the valve due to excessive
pressure build up. This condition is not covered under the limited
warranty. The Temperature-Pressure Relief Valve is not intended
for the constant relief of thermal expansion.
A properly sized thermal expansion tank must be installed on
all closed systems to control the harmful effects of thermal
expansion. Contact a local plumbing service agency to have a
thermal expansion tank installed.
See Water Line Connections on page 19 and the Water Piping
Diagrams beginning on page 33.
TEMPERATURE-PRESSURE RELIEF VALVE
Explosion Hazard
Temperature-Pressure Relief Valve
must comply with ANSI Z21.22-
CSA 4.4 and ASME code.
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
Can result in overheating and
excessive tank pressure.
Can cause serious injury or death.
This water heater is provided with a properly rated/sized and
certified combination Temperature-Pressure Relief Valve (T&P
valve) by the manufacturer. The valve is certified by a nationally
recognized testing laboratory that maintains periodic inspection
of production of listed equipment of materials as meeting the
requirements for Relief Valves for Hot Water Supply Systems,
ANSI Z21.22 • CSA 4.4, and the code requirements of ASME.
If replaced, the new T&P valve must meet the requirements
of local codes, but not less than a combination Temperature-
Pressure Relief Valve rated/sized and certified as indicated in
the above paragraph. The new valve must be marked with a
maximum set pressure not to exceed the marked hydrostatic
working pressure of the water heater (150 psi = 1,035 kPa) and
a discharge capacity not less than the water heater Btu/hr or kW
input rate as shown on the water heater’s model rating label.
NOTE: In addition to the factory installed Temperature-Pressure
Relief Valve on the water heater, each remote storage tank that
may be installed and piped to a water heating appliance must also
have its own properly sized, rated and approved Temperature-
Pressure Relief Valve installed. Call the toll free technical
support phone number listed on the back cover of this manual
for technical assistance in sizing a Temperature-Pressure Relief
Valve for remote storage tanks.
For safe operation of the water heater, the Temperature-Pressure
Relief Valve must not be removed from its designated opening
nor plugged. The Temperature-Pressure Relief Valve must be
installed directly into the fitting of the water heater designed for the
relief valve. Install discharge piping so that any discharge will exit
the pipe within 6 inches (15.2 cm) above an adequate floor drain,
or external to the building. In cold climates it is recommended
that it be terminated at an adequate drain inside the building. Be
certain that no contact is made with any live electrical part. The
discharge opening must not be blocked or reduced in size under
any circumstances. Excessive length, over 30 feet (9.14 m), or
use of more than four elbows can cause restriction and reduce
the discharge capacity of the valve.

13
No valve or other obstruction is to be placed between the
Temperature-Pressure Relief Valve and the tank. Do not connect
discharge piping directly to the drain unless a 6” (15.2 cm)
air gap is provided. To prevent bodily injury, hazard to life, or
property damage, the relief valve must be allowed to discharge
water in adequate quantities should circumstances demand. If
the discharge pipe is not connected to a drain or other suitable
means, the water flow may cause property damage.
Water Damage Hazard
Temperature-Pressure Relief Valve discharge
pipe must terminate at adequate drain.
•
CAUTION
T&P Valve Discharge Pipe Requirements:
Shall not be smaller in size than the outlet pipe size of the•
valve, or have any reducing couplings or other restrictions.
Shall not be plugged or blocked.•
Shall not be exposed to freezing temperatures.•
Shall be of material listed for hot water distribution.•
Shall be installed so as to allow complete drainage of both•
the Temperature-Pressure Relief Valve and the discharge
pipe.
Must terminate a maximum of six inches above a floor•
drain or external to the building. In cold climates, it is
recommended that the discharge pipe be terminated at an
adequate drain inside the building.
Shall not have any valve or other obstruction between the•
relief valve and the drain.
Burn hazard.
Hot water discharge.
Keep clear of Temperature-
Pressure Relief Valve
discharge outlet.
The Temperature-Pressure Relief Valve must be manually
operated at least twice a year. Caution should be taken to ensure
that (1) no one is in front of or around the outlet of the Temperature-
Pressure Relief Valve discharge line, and (2) the water manually
discharged will not cause any bodily injury or property damage
because the water may be extremely hot. If after manually
operating the valve, it fails to completely reset and continues to
release water, immediately close the cold water inlet to the water
heater, follow the draining instructions in this manual, and replace
the Temperature-Pressure Relief Valve with a properly rated/sized
new one.
NOTE: The purpose of a Temperature-Pressure Relief Valve is
to prevent excessive temperatures and pressures in the storage
tank. The T&P valve is not intended for the constant relief of
thermal expansion. A properly sized thermal expansion tank must
be installed on all closed systems to control thermal expansion,
see Closed Water Systems and Thermal Expansion on page 12.
If you do not understand these instructions or have any questions
regarding the Temperature-Pressure Relief Valve call the toll
free number listed on the back cover of this manual for technical
assistance.
CONTAMINATED AIR
Breathing Hazard - Carbon Monoxide Gas
Install water heater in accordance with
the Instruction Manual and NFPA 54 or
CAN/CSA-B149.1.
To avoid injury, combustion and ventilation
air must be taken from outdoors.
Do not place chemical vapor emitting
products near water heater.
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.
Corrosion of the flue ways and vent system may occur if air for
combustion contains certain chemical vapors. Such corrosion
may result in failure and risk of asphyxiation.
Combustion air that is contaminated can greatly diminish the life
span of the water heater and water heater components such as
hot surface igniters and burners. Propellants of aerosol sprays,
beauty shop supplies, water softener chemicals and chemicals
used in dry cleaning processes that are present in the combustion,
ventilation or ambient air can cause such damage.
Do not store products of this sort near the water heater. Air which
is brought in contact with the water heater should not contain any
of these chemicals. If necessary, uncontaminated air should be
obtained from remote or outdoor sources. The limited warranty
is voided when failure of water heater is due to a corrosive
atmosphere. (See limited warranty for complete terms and
conditions).
AIR REQUIREMENTS
Breathing Hazard - Carbon Monoxide Gas
Install water heater in accordance with
the Instruction Manual and NFPA 54 or
CAN/CSA-B149.1.
To avoid injury, combustion and ventilation
air must be taken from outdoors.
Do not place chemical vapor emitting
products near water heater.
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.
For safe operation an adequate supply of fresh uncontaminated
air for combustion and ventilation must be provided.
An insufficient supply of air can cause recirculation of combustion
products resulting in contamination that may be hazardous to
life. Such a condition often will result in a yellow, luminous burner
flame, causing sooting of the combustion chamber, burners and
flue tubes and creates a risk of asphyxiation.
Do not install the water heater in a confined space unless an
adequate supply of air for combustion and ventilation is brought
in to that space using the methods described in the Confined

14
through the water heater’s vent system causing poor combustion.
Sooting, serious damage to the water heater and the risk of fire
or explosion may result. It can also create a risk of asphyxiation.
LOUVERS AND GRILLES
The free areas of the fresh air openings in the instructions that
follow do not take in to account the presence of louvers, grilles or
screens in the openings.
The required size of openings for combustion, ventilation and
dilution air shall be based on the “net free area” of each opening.
Where the free area through a design of louver or grille or screen
is known, it shall be used in calculating the size of opening
required to provide the free area specified. Where the louver and
grille design and free area are not known, it shall be assumed
that wood louvers will have 25% free area and metal louvers and
grilles will have 75% free area. Non motorized louvers and grilles
shall be fixed in the open position.
VENT REDUCER
The SBD85500NE/SBD85500PE model is shipped with a 6" to
8" diameter flue outlet adapter. Each adapter fits on top of the
installed blower exhaust. Use only vent reducers supplied with
the unit. The venting must comply with the NATIONAL FUEL GAS
CODE, ANSI Z223.1/NFPA 54 and for Canadian installations
consult the Canadian Installation Code CAN/CSA B149.1-00.
Figure 11
Space section that follows.
Never obstruct the flow of ventilation air. If you have any doubts
or questions at all, call your gas supplier. Failure to provide the
proper amount of combustion air can result in a fire or explosion
and cause property damage, serious bodily injury or death.
UNCONFINED SPACE
An Unconfined Space is one whose volume IS NOT LESS THAN
50 cubic feet per 1,000 Btu/hr (4.8 cubic meters per kW) of the
total input rating of all appliances installed in the space. Rooms
communicating directly with the space, in which the appliances
are installed, through openings not furnished with doors, are
considered a part of the unconfined space.
Makeup air requirements for the operation of exhaust fans,
kitchen ventilation systems, clothes dryers and fireplaces shall
also be considered in determining the adequacy of a space to
provide combustion, ventilation and dilution air.
UNUSUALLY TIGHT CONSTRUCTION
In unconfined spaces in buildings, infiltration may be adequate to
provide air for combustion, ventilation and dilution of flue gases.
However, in buildings of unusually tight construction (for example,
weather stripping, heavily insulated, caulked, vapor barrier, etc.)
additional air must be provided using the methods described in
the Confined Space section that follows.
CONFINED SPACE
A Confined Space is one whose volume IS LESS THAN 50 cubic
feet per 1,000 Btu/hr (4.8 cubic meters per kW) of the total input
rating of all appliances installed in the space.
Openings must be installed to provide fresh air for combustion,
ventilation and dilution in confined spaces. The required size for
the openings is dependent on the method used to provide fresh
air to the confined space AND the total Btu/hr input rating of all
appliances installed in the space.
EXHAUST FANS
Where exhaust fans are installed, additional air shall be provided
to replace the exhausted air. When an exhaust fan is installed
in the same space with a water heater, sufficient openings to
provide fresh air must be provided that accommodate the
requirements for all appliances in the room and the exhaust fan.
Undersized openings will cause air to be drawn into the room
VENTING INSTALLATION
VENTING
THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST
BE FOLLOWED TO AVOID CHOKED COMBUSTION OR
RECIRCULATION OF FLUE GASES. SUCH CONDITIONS
CAUSE SOOTING OR RISKS OF FIRE AND ASPHYXIATION.
Heater must be protected from freezing downdrafts.
Remove all soot or other obstructions from the chimney that will
retard a free draft.
Type B venting is recommended with these heaters. For typical
venting application see TECHNICAL DATA VENTING on pages
17 and 18.
This water heater must be vented in compliance with all local
codes, the current revision of the National Fuel Gas Code (ANSI-
Z223.1) and with the Category I Venting Tables.
If any part of the vent system are exposed to ambient temperatures
below 40°F it must be insulated to prevent condensation.
• Do not connect the heater to a common vent or chimney with
solid fuel burning equipment. This practice is prohibited by
many local building codes as is the practice of venting gas
fired equipment to the duct work of ventilation systems.
FIGURE 12
• Where a separate vent connection is not available and the
vent pipe from the heater must be connected to a common

15
vent with an oil burning furnace, the vent pipe should enter the
smaller common vent or chimney at a point above the large
vent pipe.
MULTIPLE HEATER MANIFOLD
Figure 13 and tables on pages 17 and 18 should be used for
horizontally manifolding two or more heaters.
FIGURE 13
FRESH AIR OPENINGS FOR CONFINED SPACES
The following instructions shall be used to calculate the size,
number and placement of openings providing fresh air for
combustion, ventilation and dilution in confined spaces. The
illustrations shown in this section of the manual are a reference
for the openings that provide fresh air into confined spaces
only. DO NOT refer to these illustrations for the purpose of vent
installation. See Venting Installation on page 14 for complete
venting installation instructions.
OUTDOOR AIR THROUGH TWO OPENINGS
Figure 14
The confined space shall be provided with two permanent
openings, one commencing within 12 inches (300 mm) of the top
and one commencing within 12 inches (300 mm) of the bottom of
the enclosure. The openings shall communicate directly with the
outdoors. See Figure 14.
Each opening shall have a minimum free area of 1 square inch
per 4,000 Btu/hr (550 mm2per kW) of the aggregate input rating
of all appliances installed in the enclosure. Each opening shall
not be less than 100 square inches (645 cm2).
OUTDOOR AIR THROUGH ONE OPENING
Figure 15
Alternatively a single permanent opening, commencing within 12
inches (300 mm) of the top of the enclosure, shall be provided.
See Figure 15. The water heater shall have clearances of at
least 1 inch (25 mm) from the sides and back and 6 inches (l50
mm) from the front of the appliance. The opening shall directly
communicate with the outdoors or shall communicate through a
vertical or horizontal duct to the outdoors or spaces that freely
communicate with the outdoors and shall have a minimum free
area of the following:
1 square inch per 3000 Btu/hr (700 mm1. 2per kW) of the total input
rating of all appliances located in the enclosure, and
Not less than the sum of the areas of all vent connectors in the space.2.
OUTDOOR AIR THROUGH TWO HORIZONTAL DUCTS
Figure 16
The confined space shall be provided with two permanent
horizontal ducts, one commencing within 12 inches (300 mm) of
the top and one commencing within 12 inches (300 mm) of the
bottom of the enclosure. The horizontal ducts shall communicate
directly with the outdoors. See Figure 16.
Each duct opening shall have a minimum free area of 1 square
inch per 2,000 Btu/hr (1100 mm2per kW) of the aggregate input
rating of all appliances installed in the enclosure.
When ducts are used, they shall be of the same cross sectional
area as the free area of the openings to which they connect.
The minimum dimension of rectangular air ducts shall be not less
than 3 inches.

16
AIR FROM OTHER INDOOR SPACES
Figure 18
The confined space shall be provided with two permanent
openings, one commencing within 12 inches (300 mm) of the top
and one commencing within 12 inches (300 mm) of the bottom of
the enclosure. See Figure 18.
Each opening shall communicate directly with an additional
room(s) of sufficient volume so that the combined volume of all
spaces meets the criteria for an Unconfined Space.
Each opening shall have a minimum free area of 1 square inch
per 1,000 Btu/hr (1100 mm2per kW) of the aggregate input rating
of all appliances installed in the enclosure. Each opening shall
not be less than 100 square inches (645 cm2).
OUTDOOR AIR THROUGH TWO VERTICAL DUCTS
The illustrations shown in this section of the manual are a
reference for the openings that provide fresh air into confined
spaces only.
DO NOT refer to these illustrations for the purpose of vent
installation. See Venting Installation on page 14 for complete
venting installation instructions.
Figure 17
The confined space shall be provided with two permanent vertical
ducts, one commencing within 12 inches (300 mm) of the top and
one commencing within 12 inches (300 mm) of the bottom of the
enclosure. The vertical ducts shall communicate directly with the
outdoors. See Figure 17.
Each duct opening shall have a minimum free area of 1 square
inch per 4,000 Btu/hr (550 mm2per kW) of the aggregate input
rating of all appliances installed in the enclosure.
When ducts are used, they shall be of the same cross sectional
area as the free area of the openings to which they connect.
The minimum dimension of rectangular air ducts shall be not less
than 3 inches.

17
TYPE B GAS VENT
Multiple Gas Fired Tank-Type Heaters
When venting multiple tank type heaters using Type B vent
pipe, follow the installation diagram (figure 13) and tables
below which give sizing and data based upon NFPA 54/ANSI
Z223. 1992.
TABLE 7. TECHNICAL DATA VENTING
MODEL 120
Input: 120,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 5 inches 6 8 10 15 20 30 50 100
Input Btu/hr Rise Vent Connector Diameter (Inches)
120,000 1 Ft. 6 6 5 5 5 5 5 5
120,000 2 Ft. 5 5 5 5 5 5 5 5
120,000 3 Ft. 5 5 5 5 5 5 5 5
Number of Combined Input
Heaters in Thousands of Btu/hr Manifold and Common Vent Diameter (Inches)
2 240,000 7 7 6 6 6 6 6 6
3 360,000 8 8 7 7 7 6 6 6
4 480,000 9 9 9 8 8 7 7 6
MODEL 154
Input: 154,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100
Input Btu/hr Rise Vent Connector Diameter (Inches)
154,000 1 Ft. 6 6 6 6 6 6 6 6
154,000 2 Ft. 6 6 6 6 6 6 6 6
154,000 3 Ft. 6 6 6 6 6 6 6 6
Number of Combined Input
Heaters in Thousands of Btu/hr Manifold and Common Vent Diameter (Inches)
2 308,000 7 7 6 6 6 6 6 6
3 462,000 8 8 7 7 7 6 6 6
4 616,000 9 9 9 8 8 7 7 6
MODEL 180,199, 200
Input: 180,000, 190,000 and 199,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100
Input Btuh/hrRise Vent Connector Diameter (Inches)
180,000 1 Ft. 7 7 6 6 6 6 6 6
190,000 1 Ft. 7 7 7 6 6 6 6 6
199,000 1 Ft. 7 7 7 6 6 6 6 6
180,000 2 Ft. 6 6 6 6 6 6 6 6
190,000 2 Ft. 7 6 6 6 6 6 6 6
199,000 2 Ft. 7 7 6 6 6 6 6 6
180,000 3 Ft. 6 6 6 6 6 6 6 6
190,000 3 Ft. 6 6 6 6 6 6 6 6
199,000 3 Ft. 6 6 6 6 6 6 6 6
Number of Combined Input
Heaters in Thousands of Btu/hr Manifold & Common Vent Diameter (Inches)
360,000 7 7 6 6 6 6 6 6
2 380,000 7 7 7 6 6 6 6 6
398,000 6 7 7 6 6 6 6 6
540,000 7 6 6 6 6 6 6 6
3 570,000 7 6 6 6 6 6 6 6
597,000 6 7 6 6 6 6 6 6
720,000 6 6 6 6 6 6 6 6
4 760,000 6 6 6 6 6 6 6 6
796,000 6 6 6 6 6 6 6 6

18
MODEL 250
Input: 250,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100
Input Btuh/hrRise Vent Connector Diameter (Inches)
250,000 1 Ft 8 8 7 7 7 6 6 6
250,000 2 Ft 7 7 7 7 6 6 6 6
250,000 3 Ft 7 7 7 7 6 6 6 6
Number Combined Input
of Heaters in Thousands of Btu/hr Manifold and Common Vent Diameter (Inches)
2 500,000 9 9 9 8 8 7 7 7
3 750,000 12 12 10 10 10 9 8 8
4 1,000,000 14 14 12 12 10 10 9 9
MODEL 275
Input: 275,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100
Input Btu/hr Rise Vent Connector Diameter (Inches)
275,000 1 Ft 8 8 7 7 6 6 6 6
275,000 2 Ft. 8 8 7 7 6 6 6 6
275,000 3 Ft 7 7 7 7 6 6 6 6
Number of Combined Input
Heaters in Thousands of Btu/hr Manifold and Common Vent Diameter (Inches)
2 550,000 10 9 9 8 8 8 7 7
3 825,000 12 12 12 10 9 9 8 8
4 1,100,000 14 14 14 12 12 10 9 9
MODEL 310
Input: 310,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100
Input Btu/hr Rise Vent Connector Diameter (Inches)
310,000 1 Ft. 9 8 8 8 7 7 6 6
310,000 2 Ft. 8 8 8 7 7 7 6 6
310,000 3 Ft. 8 8 8 7 7 7 6 6
Number of Combined Input
Heaters in Thousands of Btu/hr Manifold & Common Vent Diameter
2 620,000 10 10 9 9 8 8 7 7
3 930,000 14 12 12 12 10 9 9 8
4 1,240,000 14 14 14 12 12 12 10 9
MODEL 366, 400
Input: 366,000, 399,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100
Input Btu/hr Rise Vent Connector Diameter (Inches)
366,000 1 Ft 9 9 9 8 8 8 8 8
399,000 1 Ft 10 9 9 9 8 8 8 8
366,000 2 Ft 9 9 8 8 8 8 8 8
399,000 2 Ft 9 9 9 8 8 8 8 8
366,000 3 Ft 9 8 8 8 8 8 8 8
399,000 3 Ft 9 9 8 8 8 8 8 8
Number of Combined Input
Heaters in Thousands of Btu/hr Manifold & Common Vent Diameter (Inches)
2 732,000 12 10 10 9 9 9 8 8
798,000 12 12 10 10 9 9 8 8
3 1,098,000 14 14 14 12 12 10 9 9
1,197,000 14 14 14 12 12 10 10 9
4 1,464,000 16 16 14 14 14 12 12 10
1,596,000 16 16 16 14 14 12 12 10
TABLE 8. TECHNICAL DATA VENTING (Continued)

19
WATER HEATER INSTALLATION
T&P VALVE DISCHARGE PIPE
Explosion Hazard
Temperature-Pressure Relief Valve
must comply with ANSI Z21.22-
CSA 4.4 and ASME code.
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
Can result in overheating and
excessive tank pressure.
Can cause serious injury or death.
This water heater is provided with a properly rated/sized and
certified combination temperature - pressure (T&P) relief valve
by the manufacturer. See Temperature-Pressure Relief Valve
on pages 12-13 for information on replacement and other
requirements.
Water Damage Hazard
Temperature-Pressure Relief Valve discharge
pipe must terminate at adequate drain.
•
CAUTION
Install a discharge pipe between the T&P valve discharge opening
and a suitable floor drain. Do not connect discharge piping
directly to the drain unless a 6” (15.2 cm) air gap is provided.
To prevent bodily injury, hazard to life, or property damage, the
relief valve must be allowed to discharge water in adequate
quantities should circumstances demand. If the discharge pipe is
not connected to a drain or other suitable means, the water flow
may cause property damage.
T&P Valve Discharge Pipe Requirements:
Shall not be smaller in size than the outlet pipe size of the•
valve, or have any reducing couplings or other restrictions.
Shall not be plugged or blocked.•
Shall not be exposed to freezing temperatures.•
Shall be of material listed for hot water distribution.•
Shall be installed so as to allow complete drainage of both•
the Temperature-Pressure Relief Valve and the discharge
pipe.
Must terminate a maximum of six inches above a floor•
drain or external to the building. In cold climates, it is
recommended that the discharge pipe be terminated at an
adequate drain inside the building.
Shall not have any valve or other obstruction between the•
relief valve and the drain.
WATER LINE CONNECTIONS
This manual provides detailed installation diagrams (see pages
33-47 of this manual) for typical methods of application for the
water heater(s).
The water heater may be installed by itself, or with a separate
storage tank, on both single and two-temperature systems. When
used with a separate storage tank, the circulation may be either
by gravity or by means of a circulating pump. When a circulating
pump is used it is important to note that the flow rate should be slow
so that there will be a minimum of turbulence inside the heater.
WATER (POTABLE) HEATING AND SPACE HEATING
All piping components connected to this unit for space heating1.
applications shall be suitable for use with potable water.
Toxic chemicals, such as those used for boiler treatment,2. shall
NEVER be introduced into this system.
This unit may NEVER be connected to any existing heating3.
system or component(s) previously used with a non-potable
water heating appliance.
When the system requires water for space heating at4.
temperatures higher than required for domestic water
purposes, a tempering valve must be installed. Please refer
to installation diagrams on pages 33-47 of this manual for
suggested piping arrangements.
THERMOMETERS (NOT SUPPLIED)
Thermometers should be obtained and field installed as shown in
the installation diagrams.
Thermometers are installed in the system as a means of detecting
the temperature of the outlet water supply.
WATER PIPING DIAGRAMS
This manual provides detailed water piping diagrams for typical
methods of application for the water heaters, see Water Piping
Diagrams beginning 33.
The water heater may be installed by itself, or with a separate
storage tank. When used with a separate storage tank, the
circulation may be either by gravity or by means of circulating
pump. When a circulating pump is used, it is important to note
that the flow rate should be slow so that there will be a minimum
of turbulence inside the water heater storage tank.
Adjust flow by throttling a full port ball valve installed in the
circulating line on the outlet side of the pump. Never throttle flow
on the suction side of a pump. See the Water Piping Diagrams
beginning on page 33.
NOTE: In addition to the factory installed Temperature-Pressure
Relief Valve (T&P valve) on the water heater, each remote
storage tank that may be installed and piped to a water heating
appliance must also have its own properly sized, rated and
approved Temperature-Pressure Relief Valve installed.
Call the toll free technical support phone number listed on the
back cover of this manual for further assistance in sizing a T&P
valve for remote storage tanks.

20
INSTALLATION DIAGRAMS - TOP INLET/OUTLET USAGE
The type, size and location of the relief valves must be in
accordance with local codes. The locations of the relief valves
shown in the installation diagrams are typical. See pages 33-47.
The heater has a factory installed high temperature limit switch
and temperature and pressure relief valve.
Cold water lines to heater should be installed as shown in order
to minimize gravity circulation of hot water to building cold water
lines.
A listed temperature and pressure relief valve of adequate capacity
is installed on the heater. The locations shown in the installation
diagrams on the following pages are typical.
The discharge opening of the temperature and pressure relief
valve, located in front of the heater must be piped to an open drain
and should not be subject to freezing temperatures.
Install in accordance with all local codes.
Use of the top inlet water connection requires installation of an inlet
dip tube (refer to figure 19). The tube is supplied in the heater.
Follow caution labels if applying heat to this fitting. Do not allow
pipe dope to contact the plastic tube during installation.
TUBE INLET INSTALLATION
FIGURE 19
CODE RESTRICTIONS
Use of the top inlet water connection is not permitted on
installations in the state of North Carolina, due to the material of
the tube (Polypropylene). Where such code restrictions exist, use
only lower inlet tank connection. This may also require a heat
trap - check local codes. The “Top Outlet” connection may still be
used on these applications. Plug or cap all unused openings in
the tank before filling with water.
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE
TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE
CONTROL WARNING ON PAGE 11. IF HIGHER PREHEAT
TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE
BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT
WATER SUPPLIED TO FIXTURES.