State Water Heaters SBD85500PE User manual

500 Tennessee Waltz Pkwy
Ashland City, TN 37015
COMMERCIAL GAS WATER HEATERS
Instruction Manual
PRINTED 0211 318298-001
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
Thank you for buying this energy efcient water heater.
We appreciate your condence 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
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.
•
•
•
•
ASME CRN Low Lead Content

2
Outdoor Air Through Two Vertical Ducts ........................................ 17
Air From Other Indoor Spaces ....................................................... 17
Technical Data Venting ..................................................................18
WATER HEATER INSTALLATION ...................................................... 19
Water Line Connections ................................................................ 19
T&P Valve Discharge Pipe ............................................................. 19
Installation Diagrams - Top Inlet/Outlet Usage .............................. 20
Code Restrictions .......................................................................... 20
Heater Wiring ................................................................................. 21
Gas Piping .....................................................................................22
Purging ..........................................................................................22
Gas Pressure Regulator ................................................................ 22
OPERATION ....................................................................................... 23
General .......................................................................................... 23
Filling .............................................................................................23
SEQUENCE OF OPERATION ........................................................... 23
Lighting & Operation Label ............................................................24
Check Venting ...............................................................................25
Check 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
Recommended Procedure for Periodic Removal of Lime Deposits
from Tank Type Commercial Water Heaters .................................. 28
Deliming Solvents .......................................................................... 28
Tank Cleanout Procedure .............................................................. 28
Deliming Using Flo-Jug Method ....................................................28
Ignition Module System ................................................................. 30
System Diagnostics ....................................................................... 30
SERVICE ............................................................................................ 30
Electrical Servicing ........................................................................ 30
FOR YOUR INFORMATION ............................................................... 30
Start Up Conditions .......................................................................30
Operational Conditions .................................................................. 30
Sequence of Operation Flow Chart ............................................... 32
OPERATIONAL CHECKLIST ............................................................. 33
WATER PIPING DIAGRAMS .............................................................. 34
MANIFOLD KITS ................................................................................49
LIMITED WARRANTY ........................................................................ 50
NOTES ............................................................................................... 51
TABLE OF CONTENTS
SAFE INSTALLATION, USE AND SERVICE........................................ 3
APPROVALS ........................................................................................ 3
GENERAL SAFETY INFORMATION .................................................... 4
Precautions ......................................................................................5
Grounding Instructions ....................................................................5
Hydrogen Gas Flammable ............................................................... 5
INTRODUCTION ..................................................................................6
Abbreviations Used .........................................................................6
Qualications ...................................................................................6
FEATURES AND COMPONENTS .......................................................7
The Hydro Cannon (self-cleaning system) ...................................... 7
High Limit Switch ............................................................................. 7
Electronic Ignition Control ................................................................ 7
Exhaust Inducer (blower assy.)........................................................ 7
Uncrating .........................................................................................7
INSTALLATION CONSIDERATIONS ................................................... 8
Rough In Dimensions ...................................................................... 8
Recovery Capacities ........................................................................ 8
Gas and Electrical Characteristics ................................................... 8
Locating the Water Heater ............................................................... 9
Clearances ......................................................................................9
Installation On Combustible Flooring ............................................. 10
Insulation Blanket ..........................................................................10
Hard Water .................................................................................... 10
Circulation Pumps .........................................................................10
High Altitude Installations .............................................................. 11
Propane Installations ..................................................................... 11
Natural Gas Installations ............................................................... 11
INSTALLATION REQUIREMENTS ....................................................12
Gas Pressure Requirements ......................................................... 12
Supply Gas Regulator ...................................................................12
Power Supply ................................................................................12
Water Temperature Control and Mixing Valves.............................. 12
Dishwashing Machines .................................................................. 13
Closed Water Systems ..................................................................13
Thermal Expansion ........................................................................ 13
Temperature-Pressure Relief Valve ............................................... 13
Contaminated Air ...........................................................................14
Air Requirements ........................................................................... 14
Unconned Space .........................................................................15
Conned Space .............................................................................15
Vent Adapter .................................................................................. 15
VENTING INSTALLATION .................................................................15
Venting ........................................................................................... 15
Multiple Heater Manifold ................................................................ 16
Fresh Air Openings For Conned Spaces ..................................... 16
Outdoor Air Through Two Openings .............................................. 16
Outdoor Air Through One Opening ................................................16
Outdoor Air Through Two Horizontal Ducts ...................................16

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
APPROVALS
Low Lead Content
California AB1953

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 qualied 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.
1. External re.
2. Damage.
3. Firing without water.
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
Explosion Hazard
Flammable hydrogen gases
may be present.
Keep all ignition sources away
from faucet when turning on
hot water.
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
ammable. 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 ow. 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.
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 Qualied Agency (as dened by ANSI
INTRODUCTION
below) in the eld 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: “Qualied Agency” - “Any
individual, rm, 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 qualied (as dened by ANSI above) and licensed
or certied 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 HYDRO CANNON (SELF-CLEANING SYSTEM)
These units include The Hydro Cannon (Self-Cleaning System)
installed in the front water inlet, See Figure 1. The Hydro Cannon
inlet tube can only be used in the front water inlet connection. Do
not install the Hydro Cannon inlet tube in either the top or back inlet
water connection. The Hydro Cannon must be oriented correctly for
proper function. There is a marked range on the pipe nipple portion
of the Hydro Cannon, 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 Hydro Cannon to reduce the probability of misaligning the
Hydro Cannon accidentally while tightening the connection to the
inlet water supply line. Improper orientation of the Hydro Cannon
can cause poor performance of the heater and can signicantly
reduce outlet water temperatures during heavy draws.
Note: The Hydro Cannon may have 1, 3 or 7 cross tubes.
FIGURE 1
HIGH LIMIT SWITCH
The digital thermostat (Figure 2) contains the high limit (energy
cutoff) switch. The high limit switch interrupts main burner gas ow
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 an ignition module. The solid state
ignition control (Figure 3), ignites the main burner by utilizing a
silicon nitride igniter. The silicon nitride igniter shuts off during
the heating cycle and the main burner ame is sensed through
a remote ame sensor integral to the silicon nitride igniter
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.)
All 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 ue, improving
efciency.
EXHAUST INDUCER
FIGURE 4
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
TOP VIEW
F
TOP
OUTLET
1 1/2” NPT
TOP
INLET
1 1/2” NPT
FIGURE 5
ROUGH IN DIMENSIONS
RECOVERY CAPACITIES
GAS AND ELECTRICAL CHARACTERISTICS
FRONT VIEW BACK VIEW
TABLE 2. RECOVERY CAPACITIES, based on 80% efciency
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)
A B C D E F
Gas
Inlet
G
H
Vent
Dia
I
JTop Front Back To p 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 1.50 812 857
SBD85500NE/
SBD85500PE 147 322 207 44 196 171 69 53 3 171 20 70 1.50 1.50 1.50 1.50 1.50 1.50 368 389
Model
Input Rate
Btu/Hr
Kw/Hr
Approximate
Tank Cap
G/L
Recovery Rating Capacities (GPH and LPH) at temperature rise indicated
30°F 40°F 50°F 60°F 70°F 80°F 90°F 100°F 110°F 120°F 130°F 140°F
17°C 22°C 28°C 33°C 39°C 44°C 50°C 56°C 61°C 67°C 72°C 78°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 Gas Type Gas Supply Pressure Gas Manifold Pressure Volts / Hz Amperes
Minumum Maximum
SBD85500NE/
SBD85500PE Natural 4.5" W.C. (1.12 kPa) 14" W.C. (3.48 kPa) 3.5" W.C. (0.87 kPa) 120/60 <5
SBD85500NE/
SBD85500PE Propane 11" W.C. (2.74 kPa) 14" W.C. (3.48 kPa) 10" W.C. (2.49 kPa) 120/60 <5
INSTALLATION CONSIDERATIONS

9
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.
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 ow.
CLEARANCES
This water heater is approved for installation on combustible
ooring (with NSF Leg Kit #9003425205) in an alcove when the
minimum clearance from any combustible construction is as
indicated in Figure 6 and Table 4.
In all installations the minimum combustible clearances from
vent piping shall be 6” (15.2 cm). Vent piping passing through a
combustible wall or ceiling must be a continuous run (no joints)
and retain the 6” (15.2 cm) clearance unless an approved reducing
thimble is used.
A service clearance of 24” (61 cm) should be maintained from
serviceable parts, such as relief valves, ue bafes, 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 cm)
5"
(12.7 cm)
5"
(12.7 cm)
20"
(50.8 cm)
TABLE 5
MINIMUM CLEARANCES TO NONCOMBUSTIBLE CONSTRUCTION
MODEL
"A"
RIGHT
SIDE
"B"
LEFT
SIDE
"C"
BACK
"D"
CEILING
SBD85500NE/
SBD85500PE 00012"
(30.5 cm)
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 oor shall
be covered by the panel. Also, see the DRAINING requirements
in MAINTENANCE Section.
THE HEATER SHALL BE LOCATED OR PROTECTED SO IT
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 identication of
components mentioned below. Failure to follow these instructions
can restrict the air ow required for proper combustion, potentially
resulting in re, 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 exhaust inducer.
• 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 ow to the burners.
• DO NOT allow insulation to come within 9 inches (23 cm)
of oor, (within 2 inches (5 cm) of bottom cover) to prevent
blockage of combustion air ow 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 ow.
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.
FIGURE 6
INSTALLATION ON COMBUSTIBLE FLOORING
The SBD85500NE/SBD85500PE is approved for installations
on combustible ooring when installed with NSF Leg Kit number
9003425205
FIGURE 7
1. Unit needs to be lifted in a way not to damage unit or laid
on it’s side to access the bottom of the legs.
2. Slide leg extension under leg and the bolt up through the
bottom hole located in the bottom of the leg.
3. Once in place, screw nut down and secure.
4. Front of leg should line up with front of leg extension as
shown in Figure 7 to make sure weight of unit is distributed
through the leg extension.

11
Breathing Hazard - Carbon Monoxide Gas
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.
Under no circumstances should
the input exceed the rate shown
on the water heater’s rating label.
Overfiring could result in damage to
the water heater and sooting.
Gas and carbon monoxide detectors
are available.
PROPANE INSTALLATIONS
INSTALLATIONS ABOVE 2000 FEET (610 METERS) REQUIRE
REPLACEMENT OF BURNER ORIFICES IN ACCORDANCE
WITH CURRENT EDITION OFTHE NATIONAL FUELGAS CODE
(ANSI Z223.1). FOR CANADIAN INSTALLATIONS CONSULT
CANADIAN INSTALLATIONS CODE CAN/CSA B149.1. FAILURE
TO REPLACE ORIFICES WILL RESULT IN IMPROPER AND
INEFFICIENT OPERATION OF THE APPLIANCE RESULTING
IN THE PRODUCTION OF INCREASED LEVELS OF CARBON
MONOXIDE GAS IN EXCESS OF SAFE LIMITS WHICH COULD
RESULT IN SERIOUS PERSONAL INJURY OR DEATH.
You should contact your gas supplier for any specic changes
which may be required in your area.
As elevation above sea level is increased, there is less oxygen
per cubic foot of air. Therefore, the heater input rate should
be reduced at high altitudes for satisfactory operation with the
reduced oxygen supply. Failure to make this reduction would
result in an over ring of the heater causing sooting, poor
combustion and/or unsatisfactory heater performance.
Ratings specied by manufacturers for most appliances apply for
elevations up to 2000 feet (610m). For elevations above 2000 feet
(610), ratings must be reduced at the rate of 4% for each 1000
feet (305m) above sea level. For example, if a heater is rated at
78,000 Btuh (22.9 Kwh) at sea level, to rate the heater at 4000 feet
(1219m), you subtract 4 (once for each thousand feet) x.04 (4%
input reduction) x 78,000 (original rating) from the original rating.
Therefore, to calculate the input rating at 4,000 feet (1219m): 4 x
.04 x 78,000 = 12,480 Btuh (3.7 Kwh), 78,000 (22.9 Kwh) - 12,480
(3.7 Kwh) = 65,520 Btuh (19.2 Kwh). At 6000 feet (1829m) the
correct input rating should be 59,280 Btuh (17.4 Kwh).
NATURAL GAS INSTALLATIONS
The natural gas red version of the water heater covered by this
manual is certied for use without modication for altitudes up to
10,100 feet.
For installations above 10,100 feet call the technical support
phone number listed on the back cover of this manual for further
technical assistance. Call the local gas or utility company to verify
Btu per cubic foot content before calling for technical assistance
and have that information available.
Note: The actual ring rate of the water heater must not exceed
the input rating on the water heater's rating label under any
circumstances.
Note: Due to the input rating reduction at high altitudes, the
output rating of the appliance is also reduced and should be
compensated for in the sizing of the equipment for applications.
See the Circulation Pump Wiring Diagrams (Figure 8, Figure
9) 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.
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.
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 8.
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.
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.
HIGH ALTITUDE INSTALLATIONS
Fire and Explosion Hazard
Gas and carbon monoxide detectors are
available.
Overfiring could result in fire or
explosion.
Under no circumstances should the
input exceed the rate shown on the
water heater’s rating label.

12
WATER TEMPERATURE CONTROL AND 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.
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
inrm 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 ts 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 satises 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 Qualied 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
GAS PRESSURE REQUIREMENTS
Natural gas models require a minimum gas supply pressure of
4.5” W.C. Propane gas models require a minimum gas supply
pressure of 11" W.C. The minimum supply pressure is measured
while gas is not owing (static pressure) AND while gas is owing
(dynamic pressure). The supply pressure (static and dynamic)
should never fall below the specied minimum supply pressure.
The supply pressure should be measured with all gas red
appliances connected to the common main ring at full capacity.
If the supply pressure drops more than 1.5” W.C. as gas begins
to ow to the water heater then the supply gas system including
the gas line and/or the gas regulator may be restricted or
undersized. See Supply Gas Regulator section and Gas Piping
section of this manual.
The gas valve on all models has a maximum gas supply
pressure limit of 14" W.C. The maximum supply pressure is
measured while gas is not owing (static pressure) AND while
gas is owing (dynamic pressure).
SUPPLY GAS REGULATOR
The water heater covered by this manual may require
the installation of a supply gas regulator. If the supply gas
pressure exceeds 14 inches W.C. a supply gas regulator must
be used. If the gas supply pressure exceeds 14" W.C. in a
multiple water heater installation, each water heater must
have its own supply gas regulator. If required, the supply gas
regulator shall be rated at or above the Btu/hr input rating of
the water heater it supplies.
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 9. The Maxitrol 325-7L or
equivalent is recommended.
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.
INSTALLATION REQUIREMENTS

13
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
DISHWASHING MACHINES
All dishwashing machines meeting the National Sanitation
Foundation requirements are designed to operate with water
ow 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 ow 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.
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 ow by throttling a full port ball valve installed in the
circulating line on the outlet side of the pump. Never throttle ow
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 ow 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 34.
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
certied combination Temperature-Pressure Relief Valve (T&P
valve) by the manufacturer. The valve is certied 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 certied 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 tting 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 oor 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.

14
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 ow 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 oor
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 13.
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 ue 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 insufcient 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
ame, causing sooting of the combustion chamber, burners and
ue tubes and creates a risk of asphyxiation.
Do not install the water heater in a conned space unless an
adequate supply of air for combustion and ventilation is brought
in to that space using the methods described in the Conned
Space section that follows.

15
through the water heater’s vent system causing poor combustion.
Sooting, serious damage to the water heater and the risk of re
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 specied.
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 xed in the
open position.
VENT ADAPTER
The SBD85500NE/SBD85500PE model is shipped with a 6" to
8" diameter vent adapter (Fig. 11). The vent adapter ts on top
of the installed blower exhaust. Use only vent adapters 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
Never obstruct the ow 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 re or explosion
and cause property damage, serious bodily injury or death.
UNCONFINED SPACE
An Unconned 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 unconned space.
Makeup air requirements for the operation of exhaust fans,
kitchen ventilation systems, clothes dryers and replaces shall
also be considered in determining the adequacy of a space to
provide combustion, ventilation and dilution air.
UNUSUALLY TIGHT CONSTRUCTION
In unconned spaces in buildings, inltration may be adequate
to provide air for combustion, ventilation and dilution of ue
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 Conned Space section that follows.
CONFINED SPACE
A Conned 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 conned spaces. The required size for
the openings is dependent on the method used to provide fresh
air to the conned 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, sufcient 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 page 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 is 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

16
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 Table 7 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 conned spaces. The
illustrations shown in this section of the manual are a reference
for the openings that provide fresh air into conned spaces
only. DO NOT refer to these illustrations for the purpose of vent
installation. See Venting Installation on page 15 for complete
venting installation instructions.
OUTDOOR AIR THROUGH TWO OPENINGS
FIGURE 14
The conned 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 mm2 per 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. 1 square inch per 3000 Btu/hr (733 mm2 per kW) of the total
input rating of all appliances located in the enclosure, and
2. Not less than the sum of the areas of all vent connectors in
the space.
OUTDOOR AIR THROUGH TWO HORIZONTAL DUCTS
FIGURE 16
The conned 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 mm2 per 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
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.
AIR FROM OTHER INDOOR SPACES
FIGURE 18
The conned 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 sufcient volume so that the combined volume of all
spaces meets the criteria for an Unconned Space.
Each opening shall have a minimum free area of 1 square inch
per 1,000 Btu/hr (2200 mm2 per 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 conned
spaces only.
DO NOT refer to these illustrations for the purpose of vent
installation. See Venting Installation on page 15 for complete
venting installation instructions.
FIGURE 17
The conned 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 mm2 per kW) of the aggregate input
rating of all appliances installed in the enclosure.

18
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 (gure 13) and tables
below which give sizing and data based upon NFPA 54/ANSI
Z223. 2006.
TABLE 7. TECHNICAL DATA VENTING
Model 500
Input: 500,000 btu/hr
Total Vent Height (Feet)
Vent connector size: 8 inches 6 8 10 15 20 30 50 100
Input (btu/hr) Rise Vent Connector Diameter (Inches)
500,000 1 Ft. - 10 10 10 9 8 8 7
500,000 2 Ft. 10 10 10 9 9 8 8 7
500,000 3 Ft. 10 10 9 9 9 8 7 7
Multiple Fan Assisted Water Heaters
Total Vent Height (Feet)
Number of 500
Heaters
Combined
Input (btu/hr)
6 8 10 15 20 30 50 100
Manifold and Common Vent Diameter (Inches)
2 1,000,000 14 14 12 12 10 10 9 8
3 1,500,000 16 16 14 14 14 12 12 10
4 2,000,000 18 18 16 16 14 14 12 12
Combination of Multiple Fan Assisted and Natural Draft Water Heaters
Total Vent Height (Feet)
Number of 500
Heaters
Combined
Input (btu/hr)
6 8 10 15 20 30 50 100
Manifold and Common Vent Diameter (Inches)
2 1,000,000 16 14 14 14 12 12 10 9
3 1,500,000 18 18 16 16 14 14 12 10
4 2,000,000 20 20 18 18 16 16 14 12

19
WATER HEATER INSTALLATION
This water heater is provided with a properly rated/sized and
certied combination temperature - pressure (T&P) relief valve
by the manufacturer. See Temperature-Pressure Relief Valve
on pages 13-14 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 oor 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 ow
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 oor
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.
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 34-48.
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 pages 34-48 are typical.
The discharge opening of the temperature and pressure relief
valve must be piped to an open drain and should not be subject
to freezing temperatures.
Install in accordance with all local codes.
WATER LINE CONNECTIONS
This manual provides detailed installation diagrams (see pages
34-48 of this manual) for typical methods of application for the
water heater(s).
WATER (POTABLE) HEATING AND SPACE HEATING
1. All piping components connected to this unit for space
heating applications shall be suitable for use with potable
water.
2. Toxic chemicals, such as those used for boiler treatment,
shall NEVER be introduced into this system.
3. This unit may NEVER be connected to any existing
heating system or component(s) previously used with a
non-potable water heating appliance.
4. When the system requires water for space heating at
temperatures higher than required for domestic water
purposes, a tempering valve must be installed. Please
refer to installation diagrams on pages 34-48 of this manual
for suggested piping arrangements.
THERMOMETERS (NOT SUPPLIED)
Thermometers should be obtained and eld 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 on page 34.
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 ow rate should be
slow so that there will be a minimum of turbulence inside the heater.
Adjust ow by throttling a full port ball valve installed in the
circulating line on the outlet side of the pump. Never throttle ow
on the suction side of a pump.
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.

20
INSTALLATION DIAGRAMS - TOP INLET/OUTLET USAGE
Use of the top inlet water connection requires installation of an
inlet dip tube (refer to gure 19). The tube is supplied in the
heater. Follow caution labels if applying heat to this tting. 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 lling with water.
TEMPERATURE SETTING SHOULD NOT EXCEED
SAFE USE TEMPERATURE AT FIXTURES. SEE WATER
TEMPERATURE CONTROL AND MIXING VALVE WARNING
ON PAGE 12. IF HIGHER PREHEAT TEMPERATURES ARE
NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT,
ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED
TO FIXTURES.