John Wood 120 Series User manual

1
Instruction Manual
PRINTED 0817 100282883_2000542785_Rev. D
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS
PURCHASED. IF YOU ARE UNSUCCESSFUL, PLEASE WRITE TO THE COMPANY LISTED ON THE RATING PLATE ON THE WATER HEATER.
RESIDENTIAL GAS WATER HEATERS
• For Your Safety •
AN ODORANT IS ADDED TO THE GAS USED
BY THIS WATER HEATER.
POWER VENTED GAS MODELS W/HOT SURFACE IGNITION
NOT FOR USE IN MANUFACTURED (MOBILE) HOMES
120 SERIES MODELS
CANADIAN MANUAL
LOW LEAD
CONTENT

2
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.
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.
WARNING
CAUTION
CAUTION
DANGER
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.
IMPORTANT DEFINITIONS
• Gas Supplier: The Natural Gas or Propane Utility or service who supplies gas for utilization by the gas burning
appliances within this application. The gas supplier typically has responsibility for the inspection and code approval of
gas piping up to and including the Natural Gas meter or Propane storage tank of a building. Many gas suppliers also
offer service and inspection of appliances within the building.
APPROVALS
LOW LEAD
CONTENT

3
GENERAL SAFETY INFORMATION
Fire Hazard
For continued protection against risk
of fire:
• Do not install water heater on
carpeted floor.
• Do not operate water heater if any
part has been exposed to flooding
or water damage.

4
GENERAL SAFETY INFORMATION
at least 18" (45.7cm) above the floor. This
will reduce, but not eliminate, the risk
Improper installation, use and service may result
in property damage.
• Do not operate water heater if any part has been exposed
to flooding or water damage.
• Inspect 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
Breathing Hazard - Carbon Monoxide Gas
•
Install vent system in accordance with codes.
•
Do not operate water heater if any part has been
exposed to flooding or water damage.
•
High altitude models should be installed at elevations
above 5,300 feet ( 1,615 m ). For operation above 10,100
feet (3,079 m), a high altitude orifice must be installed.
•
Do not operate if soot buildup is present.
•
Do NOT elevate any portion of the field supplied
drain line beyond the 1/2” adaptor above the
adaptor. This must be true for the entire length
of the drain line including the exit into an
appropriate drain.
•
Condensate lines must be free and clear of debris
and must not allow back flow through the hose.
The condensate lines must be able to flow freely
to an appropriate drain.
•
Do not obstruct water heater air intake with
insulating jacket.
•
Do not place chemical vapor emitting products
near water heater.
•
Do not allow condensate lines to become
crimped closed.
•
Analyze the entire vent system to make sure
that condensate will not become trapped in a
section of vent pipe and therefore reduce the open
cross sectional area of the vent.
•
Gas and carbon monoxide detectors are available.
•
No vent damper installation is compatible with
this power vented water heater.
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.

5
Thank You for purchasing this water heater. Properly installed and
maintained, it should give you years of trouble free service.
Abbreviations Found In This Instruction Manual:
• CSA - Canadian Standards Association
• ANSI - American National Standards Institute
• NFPA - National Fire Protection Association
• ASME - American Society of Mechanical Engineers
• AHRI - Air Conditioning, Heating and Refrigeration Institute
• UL - Underwriters Laboratories Inc.
This gas-red water heater is design certied by Underwriters
Laboratories Inc. under American National Standard/CSA Standard
for Gas Water Heaters ANSI Z21.10.3 • CSA 4.3 (current edition).
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 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: “Qualified 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 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.
PREPARING FOR THE INSTALLATION
1. Read “General Safety Information” section, page 3 and 4 of
this manual rst and then entire manual carefully. If you don’t
follow safety rules, the water heater will not operate properly.
It could cause DEATH, SERIOUS BODILY INJURY AND/OR
PROPERTY DAMAGE.
This manual contains instructions for installation, operation,
and maintenance of the gas-red water heater. It also contains
warnings throughout the manual that you must read and be
aware of. All warnings and all instructions are essential to proper
operation of the water heater and your safety. Since we cannot
put everything on the rst few pages, READ ENTIRE MANUAL
BEFORE ATTEMPTING TO INSTALL OR OPERATE THE
WATER HEATER.
2. The installation must conform with these instructions and local code
authority having jurisdiction. In absence of local codes, installation
must comply with current editions of CAN/CSA-B149.1, the Natural
Gas and Propane Installation Code and CSA C22.1, Canadian
Electrical Code. All documents are available from Canadian
Standards Association, 8501 East Pleasant Valley Road, Cleveland,
OH 44131.
3. The water heater when installed must be grounded in accordance
with the local codes, or in the absence of local codes: the Canadian
Electrical Code (C22.1).
4. If after reading this manual you have any questions or do not
understand any portion of the instructions, call the local gas utility or
the manufacturer whose name appears on the rating plate.
5. Carefully plan the place where you are going to put the water heater.
Correct combustion, vent action, and vent pipe installation are
very important in preventing death from possible carbon monoxide
poisoning and res, see Figures 1 and 2.
Examine the location to ensure the water heater complies with the
“Locating the New Water Heater” section in this manual.
INTRODUCTION
TABLE OF CONTENTS
SAFE INSTALLATION, USE AND SERVICE................................................ 2
APPROVALS ................................................................................................2
GENERAL SAFETY INFORMATION.........................................................3-4
TABLE OF CONTENTS................................................................................ 5
INTRODUCTION.......................................................................................... 5
Qualied Installer or Service Agency ................................................... 5
Preparing for the Installation................................................................ 5
TYPICAL INSTALLATION..........................................................................6-8
Mixing Valves ....................................................................................... 8
LOCATING THE NEW WATER HEATER ................................................9-12
Facts to Consider About Location ...................................................9-10
Insulation Blankets............................................................................. 10
Air Requirements .......................................................................... 10-11
Unconned Space ............................................................................. 11
Conned Space ................................................................................. 11
Fresh Air Openings for Conned Spaces .......................................... 11
Outdoor Air Through Two Openings .................................................. 11
Outdoor Air Through One Opening ............................................... 11-12
Outdoor Air Through Two Horizontal Ducts ....................................... 12
Outdoor Air Through Two Vertical Ducts............................................ 12
Air from Other Indoor Spaces ............................................................ 12
INSTALLING THE NEW WATER HEATER ...........................................13-26
Chemical Vapor Corrosion ................................................................. 13
Water Piping ...................................................................................... 13
Space Heating & Potable Water System ........................................... 13
Closed Water Systems ......................................................................13
Thermal Expansion............................................................................ 14
Temperature-Pressure Relief Valve ..............................................14-15
High Altitude Installation .................................................................... 15
Gas Piping ....................................................................................15-16
Sediment Traps.................................................................................. 16
Filling the Water Heater ................................................................16-17
Vent Pipe Assembly ........................................................................... 17
Venting ............................................................................................... 17
Vent Pipe Termination........................................................................ 17
Planning the Vent System.................................................................. 19
Polypropylene Installations ................................................................ 20
Condensate .......................................................................................20
Blower Assembly Installation .............................................................21
Installation of Vent System ................................................................ 21
Vent Terminal Installation, Sidewall.................................................... 21
Installation of Vent System, Sidewall ................................................. 23
Installation of Vertical Vent System.................................................... 23
Vent Pipe Preparation ........................................................................ 24
LIGHTING & OPERATING LABEL ............................................................. 26
TEMPERATURE REGULATION ................................................................ 27
FOR YOUR INFORMATION....................................................................... 28
Start Up Conditions............................................................................ 28
Operational Conditions ...................................................................... 28
PERIODIC MAINTENANCE....................................................................... 28
Venting System Inspection ................................................................ 28
Burner Operation and Inspection....................................................... 29
Burner Cleaning................................................................................. 29
Housekeeping.................................................................................... 29
Anode Rod Inspection .......................................................................29
Temperature-Pressure Relief Valve Test............................................ 30
Draining and Flushing........................................................................ 30
Service............................................................................................... 31
LEAKAGE CHECKPOINTS........................................................................ 31
REPAIR PARTS LIST .................................................................................32
TROUBLESHOOTING GUIDELINES....................................................33-35
NOTES ..................................................................................................36-37

6
TYPICAL INSTALLATION
* CAUTION HARNESS HAS 120 VAC. IN OPERATION.
** See “PLANNING THE VENT SYSTEM”, “CONDENSATE” and “BLOWER ASSEMBLY INSTALLATION” for more
information.
***The side recirculation loop connections may not be used as the primary water inlet and outlet connections.
For your convenience, plugs are installed in these ttings at the factory. Remove these plugs if needed for
your specic installation. Otherwise (as with all connections) check for leaks while lling the tank with water
and after completing the installation. FIGURE 1.
VACUUM RELIEF
VALVE
*INSTALL PER
LOCAL CODES
Q Rating Plate
R Insulation
S Vent Terminal
T Drain Valve
U Igniter And Main Burner
V Drain Pan
W Gas Control Valve
X Temperature Probe Harness
Y Control Harness*
Z Temperature Probe
AA Motor & Blower
CC Condensate Fitting
(4 Places Shown)**
DD Plastic Top
EE On/Off Switch
FF Exhaust Tee
GET TO KNOW YOUR WATER HEATER - GAS MODELS
A Vent Pipe
B Anode
C Hot Water Outlet
D Outlet (120 VAC)
F Gas Supply
G Main Manual Gas Shuttoff Valve
H Ground Joint Union
J Sediment Trap
K Outer Door
L Union
M Inlet Water Shuttoff Valve
N Cold Water Inlet
O Inlet Dip Tube
P Temperature & Pressure
Relief Valve
GG Elbow
H H Bushing
II Nipple
J J Condensate Tee
K K Adapter
LL Plug
MM Vent Pipe Assembly #1
N N Vent Pipe Assembly #2
OO Vent Pipe Assembly #3
PP Side Recirculation Loop
Inlet***
QQ Side Recirculation Loop
Outlet*** (not shown)
RR Vent Sound Silencer
(Optional)
SS Access Door
CONDENSATE ASSEMBLY
(U) NATURAL GAS MAIN BURNER
WITH IGNITER ASSEMBLY
SIDE VIEW
REPLACEMENT PARTS AND DELIMING
PRODUCTS
Replacement parts and recommended delimer may be ordered through
authorized servicers or distributors. When ordering parts, provide complete
model and serial numbers (see rating plate), quantity and name of part
desired. Standard hardware items may be purchased locally.
TEMPERATURE INDICATORS
(W)

7
TYPICAL INSTALLATION
CONDENSATE HOSE AND DRAIN PAN
FIGURE 1 (continued).

8
TYPICAL INSTALLATION
FIGURE 2.
MIXING VALVE / THERMAL EXPANSION TANK USAGE AND SPACE HEATING
MIXING VALVES
DANGER
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 1 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 lowest possible temperature setting that satises
demand of application a Mixing Valve should be installed at water
heater (see Figure 3) or at 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 1.
Water Temperature °F Time for 1st Degree Burns
(Less Severe Burns)
Time for Permanent Burns
2nd & 3rd Degree
(Most Severe Burns)
110 (normal shower temp.)
116 (pain threshold)
116 35 minutes 45 minutes
122 1 minute 5 minutes
131 5 seconds 25 seconds
140 2 seconds 5 seconds
149 1 second 2 seconds
154 instantaneous 1 seconds
(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15, 1978)
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 3.

9
FACTS TO CONSIDER ABOUT THE LOCATION
Carefully choose an indoor location for the new water heater, because
the placement is a very important consideration for the safety of the
occupants in the building and for the most economical use of the
appliance. This water heater is not for use in manufactured
(mobile) homes or outdoor installation.
Whether replacing an old water heater or putting the water heater
in a new location, the following critical points must be observed:
1. Select a location indoors as close as practical to the vent terminal or
location to which the water heater vent piping is going to be connected,
and as centralized with the water piping system as possible.
2. Selected location must provide adequate clearances for servicing
and proper operation of the water heater.
Installation of the water heater must be accomplished in such a manner
that if the tank or any connections should leak, the ow will not cause
damage to the structure. For this reason, it is not advisable to install
the water heater in an attic or upper oor. When such locations cannot
be avoided, a metal drain pan should be installed under the water
heater. Drain pans are available at your local hardware store. Such
a drain pan must have a clearance of at least 1.0” (2.5cm) greater
than any point on the water heater’s outer jacket and must be piped
to an adequate drain. The pan must not restrict combustion air ow.
For example, if a circular pan is used, it must be a minimum of 27”
(69cm) in diameter. See Figure 1.
Water heater life depends upon water quality, water pressure and
the environment in which the water heater is installed. Water heaters
are sometimes installed in locations where leakage may result in
property damage, even with the use of a drain pan piped to a drain.
However, unanticipated damage can be reduced or prevented by
a leak detector or water shuttoff device used in conjunction with a
piped drain pan. These devices are available from some plumbing
supply wholesalers and retailers, and detect and react to leakage
in various ways:
• Sensors mounted in the drain pan that trigger an alarm or turn off the
incoming water to the water heater when leakage is detected.
• Sensors mounted in the drain pan that turn off the water supply to
the entire building when water is detected in the drain pan.
• Water supply shuttoff devices that activate based on the water
pressure differential between the cold water and hot water pipes
connected to the water heater.
• Devices that will turn off the gas supply to a gas water heater while
at the same time shutting off its water supply.
INSTALLATIONS IN AREAS WHERE FLAMMABLE LIQUIDS
(VAPORS) ARE LIKELY TO BE PRESENT OR STORED
(GARAGES, STORAGE AND UTILITY AREAS, ETC.): Flammable
liquids (such as gasoline, solvents, propane (LP or butane, etc.) and
other substances (such as adhesives, etc.) emit ammable vapors
which can be ignited by a gas water heater’s hot surface igniter or
main burner. The resulting ashback and re can cause death or
serious burns to anyone in the area.
Also, the water heater must be located and/or protected so it is not
subject to physical damage by a moving vehicle.
LOCATING THE NEW WATER HEATER
Fire Hazard
For continued protection against risk
of fire:
• Do not install water heater on
carpeted floor.
• Do not operate water heater if any
part has been exposed to flooding
or water damage.
This water heater must not be installed directly on carpeting.
Carpeting must be protected by metal or wood panel beneath the
appliance extending beyond the full width and depth of the appliance
by at least 3” (7.6 cm) in any direction, or if the appliance is installed

10
in an alcove or closet, the entire oor must be covered by the panel.
Failure to heed this warning may result in a re hazard.
Minimum clearances between water heater and combustible
construction are 0 inch at the sides and rear, 5.5” (14.0 cm) from the
front and 12” (30.5 cm) from top. (Standard clearance.) If clearances
stated on the heater differ from standard clearances, install water
heater according to clearances stated on the heater.
Adequate clearance 24” (61.0 cm) for servicing this appliance should
be considered before installation, such as changing the anodes, etc.
A minimum clearance of 5.5” (14.0 cm) must be allowed for access
to replaceable parts such as thermostats, drain valve, relief valve
and condensate drain.
When installing the heater, consideration must be given to proper
location. Location selected should be as close to the wall as practicable
and as centralized with the water piping system as possible.
FIGURE 4.
A gas water heater cannot operate properly without the correct amount
of air for combustion. Do not install in a conned area such as a closet,
unless you provide air as shown in the “Locating The New Water
Heater” section. 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 death, serious bodily injury, or property damage.
Breathing Hazard - Carbon Monoxide Gas
Install water heater in accordance with
Instruction Manual and 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.
FIGURE 5.
If this water heater will be used in beauty shops, barber shops,
cleaning establishments, or self-service laundries with dry cleaning
equipment, it is imperative that the water heater or water heaters
be installed so that combustion and ventilation air be taken from
outside these areas.
Propellants of aerosol sprays and volatile compounds, (cleaners,
chlorine based chemicals, refrigerants, etc.) in addition to being highly
ammable in many cases, will also react to form corrosive hydrochloric
acid when exposed to the combustion products of the water heater.
The results can be hazardous, and also cause product failure.
INSULATION BLANKETS
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 standby heat loss
encountered with storage tank heaters. Your water heater meets or
exceeds the Energy Policy Act standards with respect to insulation and
standby loss requirements, making an insulation blanket unnecessary.
Should you choose to apply an insulation blanket to this heater, you
should follow these instructions (For identication of components
mentioned below, see Figure 1). 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 blower assembly.
• Do not cover the outer door, thermostat or temperature & pressure
relief valve.
• Do not allow insulation to come within 2” (5.1 cm) of the oor to
prevent blockage of combustion air ow to the burner.
• 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.
AIR REQUIREMENTS
Breathing Hazard - Carbon Monoxide Gas
Install water heater in accordance with
Instruction Manual and 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.

11
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 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.
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 should 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.
DIRECT VENT APPLIANCES
Appliances installed in a Direct Vent conguration that derive all
air for combustion from the outdoor atmosphere through sealed
intake air piping are not factored in the total appliance input Btu/hr
calculations used to determine the size of openings providing fresh
air into conned spaces.
EXHAUST FANS
Where exhaust fans are installed, additional air should 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 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 fresh air openings in instructions that follow do not
take in to account presence of louvers, grilles or screens in openings.
The required size of openings for combustion, ventilation and dilution
air should 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
should 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 should 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 should be xed in the open position.
FRESH AIR OPENINGS FOR CONFINED SPACES
The following instructions should 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 Installation of Vent System on
pages 18-27 for complete venting installation instructions.
OUTDOOR AIR THROUGH TWO OPENINGS
FIGURE 6.
The confined space should 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 should communicate directly with
the outdoors. See Figure 6.
Each opening should 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 should
not be less than 100 square inches (645 cm2).
OUTDOOR AIR THROUGH ONE OPENING
FIGURE 7.
Alternatively a single permanent opening, commencing within 12
inches (300 mm) of the top of the enclosure, should be provided. See

12
Figure 7. The water heater should have clearances of at least 1 inch
(25 mm) from the sides and back and 6 inches (150 mm) from the front
of the appliance. The opening should directly communicate with the
outdoors or should communicate through a vertical or horizontal duct
to the outdoors or spaces that freely communicate with the outdoors
and should have a minimum free area of the following:
1. 1 square inch per 3000 Btu/hr (700 mm2per 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 space.
OUTDOOR AIR THROUGH TWO HORIZONTAL DUCTS
FIGURE 8.
Conned space should be provided with two permanent horizontal
ducts, one commencing within 12 inches (300 mm) of top and one
commencing within 12 inches (300 mm) of bottom of enclosure. Horizontal
ducts should communicate directly with outdoors. See Figure 8.
Each duct opening should 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 should 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 should be not less than 3 inches.
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 Installation of Vent System on pages 18-27 for complete venting
installation instructions.
FIGURE 9.
The conned space should 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 should communicate directly with the
outdoors. See Figure 9.
Each duct opening should 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 should 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 should be not less than
3 inches.
AIR FROM OTHER INDOOR SPACES
FIGURE 9A.
The confined space should 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 9A.
Each opening should 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 should 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 should not be
less than 100 square inches (645 cm2).

13
This water heater should not be connected to any heating systems
or component(s) used with a non-potable water heating appliance.
All piping components connected to this unit for space heating
applications should be suitable for use with potable water.
Toxic chemicals, such as those used for boiler treatment should not
be introduced into this system.
When the system requires water for space heating at temperatures
higher than required for domestic water purposes, a mixing
valve must be installed. Please refer to Figure 2 for suggested
piping arrangement.
This water heater cannot be used in space heating applications only.
SPACE HEATING AND POTABLE WATER SYSTEM
This appliance has been design certied as complying with
American National Standard/CSA Standard for water heaters and is
considered suitable for Water (Potable) Heating and Space Heating.
Your water heater is equipped with inlet/outlet connections for
use in space heating applications (see Figure 2). If this water
heater is to be used to supply both space heating and potable
(drinking) water, the instructions listed below must be followed:
• Be sure to follow the manual(s) shipped with the air handler or other
type heating system.
• This water heater is not to be used as a replacement for an existing
boiler installation.
• Do not use with piping that has been treated with chromates, boiler
seal or other chemicals and do not add any chemicals to the water
heater piping
• If the space heating system requires water temperatures in
excess of 120°F (49°C), a mixing valve must be installed per the
manufacturer’s instructions in the potable hot water supply to limit
the risk of scald injury.
• Pumps, valves, piping and fittings must be compatible with
potable water.
• A properly installed flow control valve is required to prevent
thermosiphoning. Thermosiphoning is the result of a continuous
ow of water through the air handler circuit during the off cycle.
Weeping (blow off) of the temperature and pressure relief valve
(T & P) or higher than normal water temperatures are the rst signs
of thermosiphoning.
• The hot water line from the water heater should be vertical past
any mixing valve or supply line to the heating system to remove air
bubbles from the system.
• Do not connect the water heater to any system or components
previously used with non-potable water heating appliances when
used to supply potable water.
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.
CHEMICAL VAPOR CORROSION
CORROSION OF THE FLUEWAYS AND VENT SYSTEM MAY
OCCUR IF AIR FOR COMBUSTION CONTAINS CERTAIN CHEMICAL
VAPORS. SUCH CORROSION MAY RESULT IN FAILURE AND
RISK OF ASPHYXIATION.
Spray can propellants, cleaning solvents, refrigerator and air
conditioning refrigerants, swimming pool chemicals, calcium and
sodium chloride (water softener salt), waxes, and process chemicals
are typical compounds which are potentially corrosive.
Do not store products of this sort near the heater. Also, air which is
brought in contact with the heater should not contain any of these
chemicals. If necessary, uncontaminated air should be obtained from
remote or outside 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).
WATER PIPING
DANGER
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 valves are
available.
Read instruction manual for safe
temperature setting.
HOTTER WATER CAN SCALD:
Water heaters are intended to produce hot water. Water heated to
a temperature which will satisfy space heating, clothes washing,
dish washing, cleaning and other sanitizing needs can scald and
permanently injure you upon contact. Some people are more likely
to be permanently injured by hot water than others. These include
the elderly, children, the inrm, or physically/mentally handicapped.
If anyone using hot water ts into one of these groups or if there is
a local code or state law requiring a certain temperature water at the
hot water tap, then you must take special precautions. In addition to
using lowest possible temperature setting that satises your hot water
needs, a means such as a mixing valve, should be used at hot water
taps used by these people or at the water heater, see Figure 2. Valves
for reducing point of use temperature by mixing cold and hot water are
also available:
Consult a Qualied Installer or Service Agency. Follow manufacturer’s
instructions for installation of valves. Before changing the factory setting
on thermostat, read “Temperature Regulation” section in this manual.
INSTALLING THE NEW WATER HEATER

14
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 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 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.
NOTE: To protect against untimely corrosion of hot and cold water
ttings, it is strongly recommended that di-electric unions or couplings
be installed on this water heater when connected to copper pipe.
All gas piping must comply with local codes and ordinances or with the
Natural Gas and Propane Installation Code (CAN/CSAB149.1). Copper and
brass tubing and ttings (except tin lined copper tubing) should not be used.
FIGURE 10.
Figure 10 shows typical attachment of water piping to the water heater.
The water heater is equipped with 3/4 inch NPT water connections.
NOTE: If using copper tubing, solder tubing to an adapter before
attaching the adapter to the water heater connections. Do not solder
the water lines directly to the water heater connections. It will harm
the dip tube and damage the tank.
T & P Valve and Pipe Insulation
1. Locate the temperature and pressure relief valve on the water heater
(also known as a T&P relief valve). See Figure 11.
2. Locate the slit running the length of the T&P relief valve insulation.
3. Spread the slit open and t the insulation over the T&P relief valve. See
Figure 11. Apply gentle pressure to the insulation to ensure that it is fully
seated on the T&P Relief Valve. Once seated, secure the insulation with
duct tape, electrical tape, or equivalent. IMPORTANT: The insulation
and tape must not block the discharge opening or hinder access to the
manual relief lever (Figure 11). Ensure a discharge pipe is installed into
the T&P valve discharge opening per the instructions in this manual.
4. Locate the hot water (outlet) & cold water (inlet) pipes to the water heater.
5. Locate the slit running the length of a section of pipe insulation.
6. Spread the slit open and slip the insulation over the cold water (inlet)
pipe. Apply gentle pressure along the length of the insulation to ensure
that it is fully seated around the pipe. Also, ensure that the base of
the insulation is ush with the water heater. Once seated, secure the
insulation with duct tape, electrical tape, or equivalent.
7. Repeat steps 5 and 6 for the hot water (outlet) pipe.
8. Add additional sections of pipe insulation as needed.
FIGURE 11.
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 cer ti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 plate.
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 12 inches (30.5 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

15
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.
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 12” (30.5 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.
CAUTION
• Temperature-Pressure Relief Valve discharge
pipe must terminate at adequate drain.
Water Damage Hazard
T&P Valve Discharge Pipe Requirements:
• Should not be smaller in size than the outlet pipe size of the valve, or
have any reducing couplings or other restrictions.
• Should not be plugged or blocked.
• Should not be exposed to freezing temperatures.
• Should be of material listed for hot water distribution.
• Should be installed so as to allow complete drainage of both the
Temperature-Pressure Relief Valve and the discharge pipe.
• Must terminate a maximum of 12” (30.5 cm) 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.
• Should not have any valve or other obstruction between the relief
valve and the drain.
DANGER
• Burn hazard.
• Hot water discharge.
• Keep clear of Te mperature-
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 14 and 15.
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.
HIGH ALTITUDE INSTALLATION
This heater is approved for operation up to 5,300 feet (1,615
m) without alteration. High altitude models are available from
the factory for elevations between 5,300 feet (1,615 m) and
10,100 feet (3,079 m). For elevations above 10,100 feet (3,079
m) the input rating should be reduced at the rate of 4 percent
for each 1,000 feet (305 m) above sea level which requires
replacement of the burner orifice. Contact your local gas
supplier for further information.
Failure to replace standard orifice with a high altitude orifice
when installed above 10,100 feet (3,079 m) could result in
improper and inefficient operation of the appliance, producing
carbon monoxide gas in excess of safe limits, which could
result in serious injury or death. Contact your gas supplier
for any specific changes which may be required in your area.
GAS PIPING
Fire and Explosion Hazard
Do not use water heater with any
gas other than the gas shown on
the rating plate.
Excessive pressure to gas control
valve can cause serious injury or death
Turn off gas lines during installation.
Contact qualified installer or
service agency.
Make sure the gas supplied is the same type listed on the model
rating plate. The inlet gas pressure must not exceed 14 inch water
column (3.5 kPa) for natural and propane gas (L.P.). The minimum
inlet gas pressure shown on the rating plate is that which will permit
ring at rated input.
All gas piping must comply with local codes and ordinances or with the
Natural Gas and Propane Installation Code (CAN/CSA B149.1).
Copper or brass tubing and ttings (except tin lined copper tubing)
should not be used.
If the gas control valve is subjected to pressures exceeding 1/2 psi
(3.5 kPa), the damage to the gas control valve could result in a re
or explosion from leaking gas.
If the main gas line Shuttoff serving all gas appliances is
used, also turn “off” the gas at each appliance. Leave all
gas appliances shut “off” until the water heater installation
is complete.

16
A gas line of sufficient size must be run to the water heater.
Consult the current edition of Natural Gas and Propane
Installation Code (CAN/CSA B149.1).and your gas supplier
concerning pipe size.
There must be:
• A readily accessible manual shuttoff valve in the gas supply line
serving the water heater, and
• A sediment trap ahead of gas control valve to help prevent dirt and
foreign materials from entering the gas control valve.
• A exible gas connector or a ground joint union between the shuttoff
valve and control valve to permit servicing of the unit.
Be sure to check all the gas piping for leaks before lighting the water
heater. Use a soapy water solution, not a match or open ame. Rinse
off soapy solution and wipe dry.
Use pipe joint compound or teon tape marked as being resistant
to the action of petroleum [Propane (L.P.)] gases.
The appliance and its gas connection must be leak tested before
placing the appliance in operation.
The appliance and its individual Shuttoff valve should be disconnected
from the gas supply piping system during any pressure testing of that
system at test pressures in excess of 1/2 pound per square inch (3.5 kPa).
It should be isolated from the gas supply piping system by closing its
individual manual Shuttoff valve during any pressure testing of the gas
supply piping system at test pressures equal to or less than 1/2 pound
per square inch (3.5 kPa).
Connecting gas piping to the gas control valve of water heater can be
accomplished by either of two methods shown in Figures 12 and 13.
FIGURE 12. GAS PIPING WITH
FLEXIBLE CONNECTOR.
FIGURE 13. GAS PIPING WITH ALL
BLACK IRON PIPE TO GAS CONTROL.
SEDIMENT TRAPS
Fire and Explosion Hazard
Contaminants in the gas lines can
cause fire or explosion
Clean all of the gas piping before
installation
Install the drip leg in accordance
with CAN / CSA-B149.1
A sediment trap should be installed as close to the inlet of the
water heater as practical at the time of water heater installation.
The sediment trap should be either a tee fitting with a capped
nipple in the bottom outlet or other device recognized as an
effective sediment trap. If a tee fitting is used, it should be
installed in conformance with one of the methods of installation
shown in Figures 12 and 13.
Contaminants in the gas lines may cause improper operation of
the gas control valve that may result in fire or explosion. Before
attaching the gas line be sure that all gas pipe is clean on the
inside. To trap any dirt or foreign material in the gas supply
line, a sediment trap must be incorporated in the piping. The
sediment trap must be readily accessible. Install in accordance
with the “Gas Piping” section. Refer to the current edition of the
Natural Gas and Propane Installation Code (CAN/CSA B149.1).
FIGURE 14.
FILLING THE WATER HEATER

17
Never use this water heater unless it is completely full of water. To prevent
damage to the tank, the tank must be lled with water. Water must ow
from the hot water faucet before turning “ON” gas to the water heater.
To ll the water heater with water:
1. Close the water heater drain valve by turning handle to the right
(clockwise). The drain valve is on the lower front of water heater.
2. Open the cold water supply valve to the water heater.
NOTE: The cold water supply valve must be left open when the
water heater is in use.
3. To insure complete lling of the tank, allow air to exit by opening nearest
hot water faucet. Allow water to run until a constant ow is obtained.
This will let air out of the water heater and the piping.
4. Check all water piping and connections for leaks. Repair as needed.
VENT PIPE ASSEMBLY
There are three parts of the vent pipe assembly that connect the water
heater exhaust (located on lower back side of water heater) to inlet of the
blower assembly (mounted on top of water heater) as shown in Figure
1. These parts will need to be assembled according to the instructions
in the VENT PIPE PREPARATION section of this manual. These PVC
parts should be assembled with ASTM D-2564 grade cement.
Assemble Vent Pipe Assemblies #1, #2 and #3 (See Figure 1) prior
to cementing. The preferred orientation of Vent Pipe Assembly #1
(Condensate U-Assembly) is shown in Figure 16. However this
assembly may be rotated to a different orientation as needed for the
specic installation requirements. Note the rotational orientation of
each part by marking a line several inches long across the joints.The
long tube of Vent Pipe Assembly #2 should be approximately
vertical. If it is found that either of the two pieces of pipe in Vent
Pipe Assembly #2 are too long for proper t-up, then remove as
little material as possible to improve the t-up. Keep in mind that
the pipes will insert slightly further into the elbows when cement
is applied as it acts as a lubricating agent. The vertical distance
from the bottom of the Condensate U-Assembly to the oor that
supports the water heater should be approximately 0.25” (0.64 cm),
see Figure 16. Disassemble the parts and cement back together
using the alignment marks. After the cement dries, attach the
assembly to the blower and the water heater exhaust using the
supplied rubber boots and hose clamps.
A condensate trap is incorporated in the bottom of this vent pipe assembly.
See the CONDENSATE section of this manual for further details.
VENTING
Breathing Hazard - Carbon Monoxide Gas
•Install vent system in accordance with codes.
•
Do not operate water heater if exposed to flooding
or water damage.
•High altitude models should be installed at
elevations above 5,300 feet (1,615 m). For
operation above 10,100 feet (3,079 m), a high
altitude orifice must be installed.
•Do not operate if soot buildup.
•Do not obstruct water heater air intake with
insulating jacket.
•Do not place chemical vapor emitting products
near water heater.
•
Gas and carbon monoxide detectors are available.
•
Never operate the heater unless it is vented to the
outdoors
and has adequate air supply to avoid risks
of improper operation, fire, explosion or asphyxiation.
•
Analyze the entire vent system to make sure that
condensate will not become trapped in a section of
vent pipe and therefore reduce the open cross
sectional area of the vent.
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.

18
TERMINATION CLEARANCES SIDEWALL POWER VENT
FIGURE 15.
Vent terminal clearances for “Power Vent” installations. Power Vent congurations use room air for combustion.
VENT PIPE TERMINATION
The rst step is to determine where the vent pipe will terminate.
See Figures 15, 20 and 21. The vent may terminate through a
sidewall as shown in Figure 20 or through the roof as shown in
Figure 21.
The vent system must terminate so that proper clearances are
maintained as cited in local codes or the current edition of the
Natural Gas and Propane Installation Code (CAN/CSA-B149.1).
Instructions on proper installation through a sidewall are provided
in Figure 15.
Plan the vent system layout so that proper clearances are
maintained from plumbing and wiring.
Vent pipes serving power vented appliances are classified
by building codes as “vent connectors”. Required clearances
from combustible materials must be provided in accordance
with information in this manual under LOCATING THE NEW
WATER HEATER and INSTALLING THE WATER HEATER,
and with the Natural Gas and Propane Installation Code
(CAN/CSA-B149.1).

19
PLANNING THE VENT SYSTEM
Plan the route of the vent system from the discharge of the blower
to the planned location of the vent terminal. Water heaters covered
by these instructions are Category IV appliances.
1. Layout total vent system to use a minimum of vent pipe and elbows.
Water heaters covered by these instructions are Category IV appliances.
2. This water heater is capable of venting ue gases equivalent to
25’ (7.6 m) of 2” pipe, 65’ (19.8 m) of 3” pipe, or 128’ (39.0 m) of
4” pipe as listed in Table 2.
TABLE 2.
Number of 2” Maximum 3” Maximum 4” Maximum
90° Elbows Pipe - ft. (m) Pipe - ft. (m) Pipe - ft. (m)
1 20 (6.1) 60 (18.3) 120 (36.6)
2 15 (4.6) 55 (16.8) 112 (34.1)
3 10 (3.0) 50 (15.2) 104 (31.7)
4 -- 45 (13.7) 96 (29.3)
5 -- 40 (12.2) 88 (26.8)
6 -- 35 (10.7) 80 (24.3)
The minimum vent lengths for each of the pipe sizes is one
90° on top of the unit plus 2′ (61cm) of straight pipe and the
appropriate termination.
NOTE: The equivalent feet (m) of pipe listed above are exclusive
of the termination. That is, the termination, with an installed
screen, is assumed to be in the system and the remainder of the
system must not exceed the lengths discussed above.
3. The blower discharge adapter is made to accept only straight
sections of 2″ pipe. To start, a minimum of 2 inches (5.1 cm) of 2″
pipe must be attached to the blower discharge, see Figure 17.
If using 2” inch vent pipe:
A minimum of 2 inches (5.1 cm) must be attached to the blower
before the rst elbow. After the rst elbow add the additional
venting required for the installation. The total system cannot
exceed the lengths discussed above, where each elbow is equal
to 5 feet (1.5 m) of straight pipe. The SS2 tting, if used, counts
as being one 90 degree elbow.
If using 3” or 4” inch vent pipe:
Two inches (5.1 cm) of pipe must be attached to the blower
discharge before adding a reducer to acquire the desired pipe
diameter. An appropriately sized 45 degree schedule 40 DWV
elbow (field supplied) vent terminal must be obtained with an
equivalent screen (supplied in the vent kit). The total system
cannot exceed the equivalent pipe lengths discussed above
where each elbow is equal to 5 feet (1.5 m) of straight pipe
(3” vent pipe) or 8 feet (2.4 m) of straight pipe (4” vent pipe).
The SS2 fitting, if used, counts as one 90 degree elbow.
Approved vent pipe materials:
Approved vent pipe materials that must be used in Canada:
• ULC S636 PVC / CPVC
• ULC S636 Polypropylene - See page 21
Approved intake air pipe materials that must be used in Canada:
PVC pipe materials:
• DWV ASTM-D2665 or CSA B181.2
• Schedule 40, 80, 120 ASTM-D1785 or CSA B137.3
• SDR Series ASTM-D2241 or CSA B137.3
CPVC pipe materials:
• CPVC 41 ASTM-D2846 or CSA B137.6
• Schedule 40, 80 ASTM-F441 or CSA B137.6
• SDR Series ASTM-F442
Polypropylene - See page 21
• M & G Duravent PolyPro vent system
• Centrotherm InnoFlue vent system
NOTE: The use of cellular core PVC (ASTM F891), cellular core
CPVC, or Radel® (polyphenolsulfone) in non-metallic venting
systems is prohibited. Covering non-metallic vent pipe and ttings
with thermal insulation is prohibited.
PVC Materials should use ASTM D-2564 Grade Cement; CPVC
Materials should use ASTM F-493 Grade Cement.
If water heater is being installed as a replacement for an existing
power vented heater in pre-existing venting, a thorough inspection
of existing venting system must be performed prior to any
installation work. Verify that correct material as detailed above
has been used, and that minimum or maximum vent lengths and
terminal location as detailed in this manual have been met. Carefully
inspect entire venting system for any signs of cracks or fractures,
particularly at joints between elbows and other ttings and straight
runs of vent pipe. Check system for signs of sagging or other
stresses in joints as a result of misalignment of any components
TABLE 3.
M&G Duravent Polypro
Nominal Pipe
Diameter
Flue Outlet
Adapter
Adapter
Connector
Ring
Connector 45° elbow 90° elbow Adapter to PVC Adapter
Connector
2” 2PPS-AD PPS-PAC 2PPS-LB 2PPS-E45 2PPS-E90 2PPS-AD-PVC PPS-PAC
3” 3PPS-AD PPS-PAC 3PPS-LB 3PPS-E45 3PPS-E90 3PPS-AD-PVC PPS-PAC
4” 4PPS-AD PPS-PAC 4PPS-LB 4PPS-E45 4PPS-E90 4PPS-AD-PVC PPS-PAC
TABLE 4.
Centrotherm InnoFlue
Nominal Pipe
Diameter
Flue Outlet
Adapter
Adapter
Connector
Ring
Connector 45° elbow 90° elbow Adapter to PVC Adapter
Connector
2” ISAGL 0202 IAFC02 IANS02 ISELL0245 ISELL0287 ISTAGL0202 ISAGL0202
3” ISAGL 0303 IAFC03 IANS03 ISEL0345
ISEL0387 **
ISTAGL0303 ISAGL0303
ISELL0387
4” ISAGL 0404 IAFC04 IANS04 ISEL0445 ISEL0487 ** ISTAGL0404 ISAGL0404