Paloma PH-20R DVSN, PH-20R DVSP Installation And Operating Instruction Manual
FOR YOUR SAFETY!
— Do not store or use gasoline or other
flammable vapors or liquids or other
combustible materials in the vicinity of this
or any other appliance. To do so may result
in an explosion or fire.
— WHAT TO DO IF YOU SMELL GAS
l Do not try to light any appliance.
l Do not touch any electrical switch; do not
use any phone in your building.
l Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
l If you cannot reach your gas supplier, call
the fire department.
l Do not return to your home until authorized
by the gas supplier or fire department.
— Improper installation, adjustment,
alteration, service or maintenance can cause
property damage, personal injury or death.
Refer to this manual. Installation and service
must be performed by a qualified installer,
service agency or the gas supplier.
WARNING: If the information in these instructions is not followed exactly,
a fire or explosion may result, causing property damage, personal injury or death.
The purpose of this manual is twofold: one, to provide the installer with
the basic directions and recommendations for the proper installation and
adjustment of the water heater; and two, to the owner–operator, to
explain the features, operation, safety precautions, maintenance and
troubleshooting of the water heater. This manual also includes a parts
list.
It is very important that all persons who are expected to install, operate
or adjust this water heater read the instructions carefully so they may
understand how to perform these operations. If you don’t understand
these instructions or any terms within it, seek professional advice.
Any questions regarding the operation, maintenance, service or
warranty of this water heater should be directed to the seller from whom
it was purchased, local distributor or Paloma.
Do not destroy this manual. Please read carefully and keep in a safe
place for future reference.
Recognize this symbol as an indication of Important Safety
Information!
California Proposition 65 Warning: This product contains
chemicals known to the State of California to cause cancer, birth
defects or other reproductive harm.
Installation and Operating Instruction Manual
With Installation Instructions for the Installer
Tankless Water Heater
Warning: This water heater is not suitable
for use in manufactured (mobile) homes!
Residential Direct Vent Gas
Models:PH-20R DVSN (Natural Gas)
PH-20R DVSP (L. P. Gas)
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Safety Information
Safety Precautions . . . . . . . 3–6
LP Gas Models . . . . . . . . . . . 5
Installation Instructions
Location. . . . . . . . . . . . . . . . . . 7
Venting . . . . . . . . . . . . . . . 9-14
Water Connections. . . . . 15-17
Gas Supply. . . . . . . . . . . . . . 18
High Altitude. . . . . . . . . . . . . 18
Remote Control . . . . . . . 19, 20
Electrical Connection . . . . . . 21
Typical Installation . . . . . . . . 22
Pipe Insulation . . . . . . . . . . . 23
Installation Checklist . . . . . . 24
Operating Instructions
Lighting Instructions . . . . . . 25
Water Temperature. . . . . 26, 27
Care and Cleaning
Maintenance. . . . . . . . . . . . . 28
Housekeeping . . . . . . . . 28, 29
Vent Inspection . . . . . . . . . . . 29
Burner Inspection . . . . . . . . 29
Extended Shut-Down . . . . . . 29
Draining . . . . . . . . . . . . . . . . 30
Freeze Protection . . . . . . . . . 30
Troubleshooting Tips
Before You Call
For Service . . . . . . . . . . 31, 32
Customer Service
Parts List . . . . . . . . . . . . . . . 33
If You Need Service . . . . . . . 36
Inside you will find many helpful hints on how to use and
maintain your water heater properly. A little preventive care on
your part can save you time and money over the life of your
water heater.
You’ll find many answers to common problems in the
Troubleshooting Guide. If you review the chart of
Troubleshooting Tips first, you may not need to call for service.
READ THIS MANUAL
FOR YOUR RECORDS
Write the model and serial numbers here:
#
#
You can find them on a label on the appliance.
Staple sales slip or cancelled check here.
Proof of the original purchase date is needed to obtain service
under the warranty.
2
Your safety and the safety of others are very important. There
are many important safety messages in this manual and on
your appliance. Always read and obey all safety messages.
This is the safety alert symbol. Recognize this symbol
as an indication of Important Safety Information!
This symbol alerts you to potential hazards that can
kill or hurt you and others.
All safety messages will follow the safety alert symbol and
either the word “DANGER”, “WARNING”, “CAUTION”
or “NOTICE”.
These words mean:
DANGER
An imminently hazardous situation
that will result in death or serious
injury.
WARNING
A potentially hazardous situation that
could result in death or serious injury
and/or damage to property.
CAUTION
A potentially hazardous situation that
may result in minor or moderate
injury.
Notice:
Attention is called to observe a
specified procedure or maintain
a specific condition.
READ THE SAFETY INFORMATION
Qualified Installers Only!
Dip Switch Adjustment. . . . 34
Warranty........................... 37,38
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Be sure to read and understand the entire Instruction Manual before attempting to install or operate this
water heater. It may save you time and money. Pay particular attention to the Safety Instructions. Failure to
follow these warnings could result in serious bodily injury or death. Should you have problems understanding
the instructions in this manual, or have any questions, STOP, and get help from a qualified service technician,
or the local gas utility.
IMPORTANT SAFETY INFORMATION.
READ ALL INSTRUCTIONS BEFORE USING.
3
Failure to install and properly vent the water heater to the outdoors as outlined in the
Venting Section of the Installation Instructions in this manual can result in unsafe operation
of the water heater. To avoid the risk of fire, explosion or asphyxiation from carbon
monoxide, never operate this water heater unless it is properly vented and has an adequate
air supply for proper operation.
Be sure to inspect the vent terminal, the air intake, and the coaxial vent system on the water
heater for proper installation at initial start-up; and at least annually thereafter. Refer to the
Care and Cleaning section of this manual for more information regarding coaxial vent
system inspection.
DANGER!
INSTALL AND PROPERLY VENT THE WATER HEATER…
Gasoline, as well as other flammable materials and liquids (adhesives, solvents, paint
thinners etc.), and the vapors they produce are extremely dangerous. DO NOT handle, use
or store gasoline or other flammable or combustible materials anywhere near or in the
vicinity of a water heater or any other appliance. Be sure to read and follow the labels on
the water heater, as well as the warnings printed in this manual. Failure to do so can result
in property damage, bodily injury or death.
WARNING!
DANGER
FLAMMABLES
Vapors from flammable
liquids will explode and
catch fire causing death or
severe burns.
Do not use or store flammable
products such as gasoline,
solvents or adhesives in the
same room or area near the
water heater.
Keep flammable products:
1. far away from heater,
2. in approved containers,
3. tightly closed and
4. out of children's reach.
Installation:
Do not install water heater
where flammable products will
be stored or used unless the
main burner flame is at least
Read and follow water heater warnings and instructions. If
owners manual is missing, contact the retailer or manufacturer.
Flammable Vapors
Water he ater ha s a main
burner flame.
The main burner flame:
1. which c an come o n
at any time and
2. will ignite flammable
vapo rs.
Vapo rs:
1. cannot be seen,
2. are heavier than air,
3. go a long way on the
floo r and
4. can be carried from
other r ooms to t he
main burner flame by
air currents.
18" above the floor. This will
reduce, but not eliminate, the
risk of vapors being ignited
by the main burner flame.
Time/Temperature Relationship in Scalds
Water Temperature Time To Produce a Serious Burn
120°F (49°C) More than 5 minutes
125°F (52°C) 11/2 to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 11/2
seconds
155°F (68°C) About 1 second
Table courtesy of Shriners Burn Institute
The chart shown above may be used as a guide in
determining the proper water temperature for your home.
DANGER: Households with small children, disabled or
elderly persons may require a 120°F (49°C) or lower
temperature setting to prevent contact with “HOT” water.
Maximum water temperature occurs while burner is on.
To find water temperature being delivered, turn on a hot
water faucet and place a thermometer in the water stream
and read the thermometer. (See page 26 & 27 for more
details.)
The temperature of the water at the outlet of the water
heater can be regulated by setting the temperature on
Remote Control. The remote control was set at 100°F
(38°C) before it was shipped from the factory.
The diagram to the bottom left illustrates the Remote
Control and how to adjust the water temperature.
Notice: The factory setting allows operating temperatures
between 100°F (38°C) and 120°F (49°C). Temperatures
of up to 140°F (60°C) can be achieved with the MAIN
(UMC-117) remote control and a dip switch adjustment.
Only qualified service personnel should perform this
adjustment. Only factory authorized remote control(s)
should be used.
Notice: When this water heater is supplying general
purpose hot water requirements for use by individuals,
a thermostatically controlled mixing valve for reducing
point of use water temperature is recommended to reduce
the risk of scald injury. Contact a licensed plumber or the
local plumbing authority for further information.
DANGER!
WATER TEMPERATURE SETTING
Safety and energy conservation are factors to be considered when selecting the water
temperature setting of a water heater’s remote control. Water temperatures above
125°F (52°C) can cause severe burns or death from scalding. Be sure to read and follow
the warnings outlined on the label pictured below.
IMPORTANT SAFETY INFORMATION
READ ALL INSTRUCTIONS BEFORE USING.
* Temperatures above 120°F (49°C) can be achieved
by adjusting the dip switch. See page 34 for dip
switch adjustment.
Notice:
Display
shows
°F only.
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DANGER
HOT
BURN
Water temperature over 125°F can
cause severe burns instantly or
death from scalds.
Children, disabled and elderly are
at highest risk of being scalded.
See instruction manual before
setting temperature at water
heater.
Feel water before bathing or
showering.
Temperature limiting valves are
available, see manual.
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PRIORITY
Higher (Hotter) Lower (Cooler)
100 102 104 106 108 110 112 114 116 118 120* 125 130 135 140 °F
38 39 40 41 42 43 44 46 47 48 49* 52 54 57 60 °C
°F
POWER
ON/OFF
5
Both LP and natural gas have an odorant added to aid in detecting a gas leak. Some
people may not physically be able to smell or recognize this odorant. If you are unsure or
unfamiliar with the smell of LP or natural gas, ask the gas supplier. Other conditions, such as
“odorant fade”, which causes the odorant to diminish in intensity, can also hide or camouflage
a gas leak.
DANGER!
NATURAL GAS AND LIQUEFIED PETROLEUM MODELS
l Water heaters utilizing LP gas are different
from natural gas models. A natural gas
water heater will not function safely on LP
gas and vice versa.
l No attempt should ever be made to convert
the water heater from natural gas to LP
gas. To avoid possible equipment damage,
personal injury or fire, do not connect the
water heater to a fuel type not in
accordance with the unit data plate;
propane for propane units and natural gas
for natural gas units. These units are not
certified for any other fuel type.
l LP appliances should not be installed below
grade (for example, in a basement) if such
installation is prohibited by federal, state
and/or local laws, rules, regulations or
customs.
l Propane or LP gas must be used with great
caution. It is heavier than air and will
collect first in lower areas, making it hard
to detect at nose level.
l Before attempting to light the water heater,
make sure to look and smell for gas leaks.
Use a soapy solution to check all gas fittings
and connections. Bubbling at a connection
indicates a leak that must be corrected.
When smelling to detect a gas leak, be sure
to sniff near the floor also.
l Gas detectors are recommended in LP
and natural gas applications and their
installation should be in accordance with
the detector manufacturer’s
recommendations and/or local laws,
rules, regulations or customs.
l It is recommended that more than one
method, such as soapy solution, gas
detectors, etc., be used to detect leaks
in gas applications.
Notice: If a gas leak is present or suspected:
l Do not
attempt to find the cause yourself.
l Do not
try to light any appliance.
l Do not
touch any electrical switch.
l Do not
use any phone in your building.
l Leave the building immediately and make
sure your family and pets leave also.
l Leave the doors open for ventilation and
contact the gas supplier, a qualified service
agency or the fire department.
l Stay away from the building until the
service call has been made, the leak is
corrected and a qualified agency has
determined the area to be safe.
6
Have the installer show you the location of the gas shut-off valve and how to shut it off
if necessary. Turn off the manual shut-off valve if the water heater has been subjected
to overheating, fire, flood, physical damage or if the gas supply fails to shut off.
l Read this manual entirely before installing
or operating the water heater.
l Use this appliance only for its intended
purpose as described in this Instruction
Manual.
l Be sure your appliance is properly installed
in accordance with local codes and the
provided installation instructions.
l Do not attempt to repair or replace any
part of your water heater unless it is
specifically recommended in this manual.
All other servicing should be referred to a
qualified technician.
SAFETY PRECAUTIONS
IMPORTANT SAFETY INFORMATION
READ ALL INSTRUCTIONS BEFORE USING.
WARNING!
For your safety, the information in this manual must be followed to minimize the risk
of fire or explosion, electric shock, or to prevent property damage, personal injury or
loss of life.
Notice:This water heater requires a special venting system. Refer to the instructions in the
vent section for proper vent material and method of installation.
FOR INSTALLATIONS IN THE STATE OF CALIFORNIA
California Law requires that water heaters must be braced, anchored or strapped to resist
falling or horizontal displacement due to earthquake motions. For water heaters up to 52
gallon capacity, a brochure with generic earthquake bracing instructions can be obtained from:
Office of the State Architect, 1102 Q Street, Suite 5100, Sacramento, CA 95814 or you may call
916-445-8100 or ask a water heater dealer.
However, applicable local codes shall govern installation. For residential water heaters
of a capacity greater than 52 gallons or tankless-style, consult the local building jurisdiction
code for acceptable bracing procedures.
READ AND FOLLOW THIS SAFETY INFORMATION CAREFULLY.
SAVE THESE INSTRUCTIONS
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WARNING: Follow vent
manufacturer’s instruction
while installing vent. If
required, provide
additional clearances from
vent to combustibles per
vent manufacturer’s
instruction.
7
Installing the water heater :
This water heater must be installed in accordance with these instructions, local codes, utility company
requirements and/or in the absence of local codes, use the latest edition of the American National
Standard/National Fuel Gas Code. A copy can be purchased from either the American Gas Association, 400
North Capitol Street Northwest, Washington, DC 20001 as ANSI standard Z223.1 or National Fire Protection
Association, 1 Batterymarch Park, Quincy, MA 02269 as NFPA 54. In Canada, the latest edition of the CSA
B149.1 Natural Gas and Propane Installation, and the Canadian Electrical Code, CSA C22.1 Part 1, in the
absence of local codes.
Location of Water Heater
The water heater should not be located in
an area where leakage of the heat exchanger
or connections will result in damage to the
area adjacent to it or to lower floors of the
structure.
When such areas cannot be avoided, it is
recommended that a suitable catch pan,
adequately drained, must be installed under
the water heater.
The pan must not restrict combustion
air flow.
A gas fired water heater or any other appliance
should not be installed in a space where
liquids which give off flammable vapors are
to be used or stored. Such liquids include
gasoline, LP gas (butane or propane), paint
or adhesives and their thinners, solvents
or removers.
Because of natural air movement in a room or
other enclosed space, flammable vapors can be
carried some distance from where their liquids
are being used or stored. The open flame of
the water heater’s main burner can ignite these
vapors causing an explosion or fire which may
result in severe burns, death or property
damage.
The water heater must be located so it is not
subject to physical damage, for example, by
moving vehicles, area flooding, etc.
If the water heater is installed in a garage, it
should be installed so that the direct ignition
system and main burner are no less than 18
inches (45 cm) above the garage floor.
Raising the gas fired water heater will reduce
BUT NOT eliminate the possibility of lighting
the vapor of any flammable liquids which may
be improperly stored or accidentally spilled.
l The water heater should be installed as
close as practical to the vent termination to
minimize vent length and the number of
elbows required for venting.
l The water heater should be installed with
the proper venting materials and termination
suitable for Category III venting.
l A fire stop plate should be installed at every
penetration of a floor or ceiling if the vent is
not running in a fire rated shaft.
l Failure to install and properly vent the
water heater to the outdoors as outlined
in the Venting Section of this manual
can result in unsafe operation.
l Long hot water lines should be insulated to
conserve water and energy.
l The water heater and water lines should
be protected from exposure to freezing
temperatures.
l Do not install the water heater in
bathrooms, bedrooms, any occupied rooms
normally kept closed, or in outdoor areas.
l Do not install water heater where subject
to vibrations.
l Do not install the water heater in
Recreational Vehicles, Mobile Homes,
Boats and other Watercrafts.
l Do not install the water heater near vents
for heating or cooling. A minimum of 4
feet (1.2 m) should be maintained.
l Minimum clearance from combustible and
non-combustible construction is 1/2” (1.3
cm) sides, 0” rear (with support bracket);
12” (30 cm) from the bottom; 12” (30 cm)
from the front of the water heater; and 12”
(30 cm) from the top (24” [61 cm] from
front and top is recommended for servicing
purposes).
l Maintain a minimum clearance of
1” (2.5 cm) around the coaxial vent pipe to
combustible or non-combustible
construction, unless otherwise specified by
vent manufacturer or installed in an
enclosed space. If the clearances stated on
the Instruction/Warning Label, located on
the front panel of the heater differ, install
the water heater according
to the clearances stated on the label.
WARNING:
Combustible construction
refers to adjacent walls
and ceilings and should not
be confused with
combustible or flammable
products and materials.
Combustible and/or
flammable products and
materials should never be
stored in the vicinity of this
or any gas appliance.
Minimum Clearance from
Combustible and
Non-Combustible
Construction.
Top = 12" (30 cm) Bottom = 12"
Front = 12" (30 cm) Back = 0"*
Side = 1/2" CoAxial Vent = 1"
* (with support bracket)
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(30 cm)
min.
1/2 "
(1.3 cm)
min.
1/2 "
(1.3 cm)
!
min. 1"
min. 12"
(24" (61 cm) minimum is
recommended for service)
(2.5 cm)(2.5 cm)
min. 1"
1” (2.5 cm) min
1” (2.5 cm)
min
1” (2.5 cm)
min
Coaxial Vent Pipe
& Air Intake
Installing the water heater:
Corrosive Atmospheres
The air in beauty shops, dry cleaning
establishments, photo processing labs,
and storage areas for liquid and powdered
bleaches or swimming pool chemicals
often contains such halogenated
hydrocarbons.
An air supply containing halogenated
hydrocarbons may be safe to breathe,
but when it passes through a gas flame,
corrosive elements are released that
will shorten the life of any gas burning
appliance.
Propellants from common spray cans
or gas leaks from A/C and refrigeration
equipment are highly corrosive after
passing through a flame.
The water heater warranty is voided when
failure of the heater is due to operation in
a corrosive atmosphere.
NOTICE: The water heater
should not be installed near
an air supply containing
halogenated hydrocarbons.
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Inspect Shipment
Inspect the water heater for possible damage. Check the markings on the rating plate of
the water heater to be certain the type of gas supplied corresponds to the water heater
requirements. Verify all included parts are present (see below).
U se & Care M anual
Wi th Installation Instructions for the I nstalle r
R esidential G as
T ankless
W ater Heaters
W arning: This water heater is not suitable for
use in manufactur ed (mobile) homes!
The purpose of this manual is twofold: one, to pr ovide the installer with
the basic dir ections and re commendations for the pr oper installation and
adjustment of the water heater; and two, to the owner–operator , to
explain the featur es, operation, safety pr ecautions, maintenance and
tr oubleshooting of the water heater . This manual also includes a parts
list.
It is imperative that all persons who ar e expected to install, operate or
adjust this water heater r ead the instructions car efully so they may
understand how to perform these operations. If you don’t understand
these instructions or any terms within it, seek pr ofessional advice.
Any questions r egarding the operation, maintenance, service or
warranty of this water heater should be dir ected to the selle rf ro m whom
it was pur chased. If additional information is re quir ed, r efer to the
section on How to Obtain Service Assistance.
Do not destr oy this manual. Please r ead c ar efully and keep in a safe
place for futur e r efer ence.
Recognize this symbol as an indication of Important Safety
!
Information!
C alifornia P r oposition 65 W arning: This pr oduct contains
!
chemicals known to the S tate of California to cause cancer , birth
defects or other r epr oductive harm.
W ARNING: If the information in these instructions is not followed exactly ,
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a fir e or explosion may r esult causing pr operty damage, personal injury o r death.
!
FOR YOUR SAFETY!
l If you cannot r each your gas supplier , call
— Do not stor e or use gasoline or other
the fir e department.
flammable vapors or liquids or other
combustible materials in the vicinity of this or
l Do not r eturn to your home until authorized
any other appliance. To do so may r esult in an
by the gas supplier or fir e department.
explosion or fir e.
— Impr oper installation, adjustment,
alteration, service or maintenance can cause
— WHA TT O DO IF YOU SMELL GAS
pr operty damage, personal injury , or death .
lDo not try to light any appliance.
Refer to this manual. Installation and servic e
l Do not touch any electrical switch; do not
must be performed by a qualified installer ,
use any phone in your building.
service agency or the gas supplier .
l Immediately call your gas supplier fr om a
neighbor ’s phone. Follow the gas
supplier ’s instructions.
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Use & Care Manual
Manual Appliance
Gas Shut-off Valve
Drain Tubing
PRIORITY
°F
POWER
ON/OFF
Remote Control
Assembly Kit
Wood Screw x 5pcs.
Washer x 4 pcs.
The water heater must be installed with a 3”/5” diameter UL approved Category III Coaxial Stainless Steel
appliance coaxial vent pipe and an appropriate adapter.
Venting
The installation of venting must comply
with national codes, local codes and the
vent manufacturer’s instructions.
The water heater must be vented to the
outdoors as described in these instructions.
DO NOT connect this water heater to a
chimney. It must be vented separately from
all other appliances.
All coaxial vent components (adapters, pipe,
elbows, terminals, etc.) should be UL 1738
Certified Stainless Steel Venting Material
(e.g. AL29-4C).
The specified vent termination must be used.
(Refer to pages 13 and 14 for an example of
the concentric vent.)
Use the screws provided to connect the
coaxial vent pipe with the anti-disconnection
joint.
Follow coaxial vent manufacturer’s
installation instructions and their
recommended clearances to combustibles.
The unit can be vented either horizontally
or vertically.
Coaxial vent pipe runs must be adequately
supported along both horizontal and vertical
runs.
The maximum recommended unsupported
span should be no more than five (5) feet
(1.5 m). Support isolation hanging bands
should be used. DO NOT use wire. (See
diagram below).
Notes on pre-existing vent:
If the water heater is being installed as a
replacement for an existing water heater, a
thorough inspection of the existing venting
and air intake system must be performed
prior to any installation work. Verify that the
correct materials, vent lengths and terminal
locations as detailed in this Instruction
Manual have been met. Carefully inspect the
entire venting and air intake system for any
signs of cracks or fractures, particularly at
the joints between elbows or other fittings
and the straight runs of vent pipe. Check the
system for signs of sagging or other stresses
in the joints as a result of misalignment of
any components in the system. If any of
these conditions are found, they must be
corrected in accordance with the venting
instructions in this manual before completing
the installation and putting the water heater
into service.
See the back page of this manual for
additional requirements for the
Commonwealth of Massachusetts.
DANGER: Failure to
install the appliance vent
adapter and properly vent
the water heater to the
outdoors as outlined in the
Venting section of this
manual will result in unsafe
operation of the water
heater, causing death,
serious injury, explosion,
or fire. To avoid the risk
of fire, explosion, or
asphyxiation from carbon
monoxide, NEVER operate
the water heater unless it is
properly vented and has
adequate air supply for
proper operation as
outlined in the Venting
section of this manual.
WARNING: Use 3”/5”
UL approved Category III
Stainless Steel vent material
only. No other vent
material is permitted.
WARNING: Refer to
page 7 for clearances to
combustible material.
Venting Lengths
MAXIMUM VENT LENGTH: The
system will not operate if there is excessive
restriction (pressure drop) in the venting
system. A maximum 34’6”
(10.5 m)
of vent
pipe may be used provided there is only one
90° elbow in the system. If additional elbows
are required: two elbows can be used with
33’
(10.0 m)
, three elbows can be used with
31’6”(9.5 m)
or four elbows can be used with
30
’
(9.0 m) of vent pipe.
Notice: For long vent lengths, loosen the
screw on the damper, slide the damper all
the way to the left and tighten the screw.
A 90° elbow is equivalent to 1’6” (.5 m) of
straight pipe. A 45° elbow is equivalent to
9”(.25 m) of straight pipe.
The vent termination does not count as
straight pipe when determining total vent
lengths.
The 94° elbow is equivalent to a 90° elbow.
The vent should be installed with a slight
downward slope of 7/8” per foot of
horizontal run toward the vent terminal (see
diagram below). This ensures that any
condensate formed during operation of the
unit is evacuated from the appliance and to
prevent rain from entering the appliance.
An upward slope toward the water heater is
not acceptable for horizontal venting.
MINIMUM VENT LENGTH: The venting
may be as short as 12” (30 cm), provided
one vent termination is installed to the
outdoors through a sidewall, one 94° elbow
is included in the installation and the wall
plates are installed.
Notice: Make sure that the seam of the inner
vent pipe in horizontal runs is toward the top
of the installation (see diagram below).
downward slope
7/8" per foot
Ceiling
Vent Pipe
Wall Plates
Board
Inspection
Fire
Stop
Access Panel #1
Inspection
Access
Panel #2
Number
of 90°
elbows
(bends)
Maximum
Length of
Straight
Pipe
Minimum
Vent
Length
for Open
Damper
1
2
3
4
34’ 6”
(10.5 m)
33’
(10.0 m)
31’ 6”
(9.5 m)
30’ 0”
(9.0 m)
16’ 5”
(5.0 m)
14’ 9”
(4.5 m)
13’ 1”
(4 m)
11’ 5”
(3.5 m)
9
NO!
YES!
Opened
Closed
Screw Damper
94° Elbow
2’
(61 cm)
Max.
Vent Seam
Installing the water heater:
Venting Through Closed Spaces
If the coaxial vent piping passes through a closed space, a minimum
clearance of 1” (2.5 cm) when installed horizontally or 6”
(15 cm)
when
installed vertically should be maintained between the coaxial vent pipe
and combustibles and noncombustibles. Be sure to follow local codes
and vent manufacturer’s installation instructions.
For maintenance and inspection purposes, the following access panels
are required.
l Two (2) inspection access panels large enough to allow access for
venting inspection. One (1) of these access panels should be close
to where the coaxial vent pipe enters the ceiling. The other access
panel should be near the vent termination.
l A ventilation access panel with a 16 in
2
(103 cm2) opening should
be provided every 10 ft (3 m).
downward slope
7/8" per foot
Ceiling
Vent Pipe
Wall Plat
Board
Inspection
Fire
Stop
Access Panel #1
Inspection
Access
Panel #2
Appliance Vent Adapter
The water heater must be installed
with a UL 1738 approved Category III
Stainless Steel appliance coaxial vent
adapter.
Read the following instructions before
installation.
l Test fit the adapter over the water heater
collar before proceeding.
l Slide adapter end “A” down over heater
collar “B” as far as it will go.
l Use the screws provided with the vent
adapter to attach the adapter to the heater
collar.
NOTICE: Follow the appliance coaxial vent
adapter manufacturer’s instructions.
er
Exhaust
Draining the Condensate
Provision should be made to collect and
dispose of condensate from venting systems.
When a water heater is vented horizontally,
the vent pipe can have only a DOWNWARD
slope towards the termination. See Example A
on page 13 for DOWNWARD slope for
horizontally vented water heaters.
When a water heater is vented vertically, an
UPWARD slope must always be used. A
condensate trap must be installed in the
horizontal section of the vent and as close
as practical to the water heater in order to
prevent condensate from draining back into
the water heater. See the diagram on page 14
showing UPWARD slope for vertically
vented water heaters.
Always attach a drain hose to the drain fitting
and plumb the hose to a sanitary sewer drain.
A high temperature silicone tubing suitable for
use with acidic condensate and appropriate for
the temperature range should be used.
The drain tube is fashioned into a “pigtail” trap
and must be filled with water to prevent flue
gases from emitting into the building prior to
operating the appliance.
CAUTION: Condensate
must drain away from the
water heater and should
not be allowed to drain
back into any part of the
vent system.
WARNING: Failure to
provide a vent condensate
drain close to the appliance
could allow acidic flue gas
condensate to enter into
appliance flueways, causing
premature failure of the
appliance.
CAUTION: Condensate
is known to be acidic; refer
to local, state (provincial)
or federal codes for proper
handling and discharge
methods.
10
CAUTION: Ensure that the
appliance vent adapter is
securely attached to the
water heater collar.
94° Elbow
2’
(61 cm)
Max.
Flow
Appliance
Vent Adapt
A
Collar
B
Water Heater
G
The following information should be used for determining the proper location of the vent
terminal for direct vent tankless water heaters.
V
VENT TERMINAL
X
AIR SUPPLY INLET
AREA WHERE TERMINAL IS NOT PERMITTED
Horizontal Vent Terminal Location
1 In accordance with current CAN/CGA-B149 Installation Codes.
2 In accordance with current ANSI Z223.1/ NFPA 54 National Fuel Gas Code.
* If clearances are not specified, then follow local installation codes and the requirement of the gas supplier.
** For condensing appliances: The vent for this appliance shall not terminate over public walkways, near soffit vents, crawl space vents,
or other areas where condensate or vapor could create a nuisance, hazard or cause property damage, or where condensate or vapor
could cause damage or could be detrimental to the operation of regulators, relief valves or other equipment.
H = Clearance to each side of center
line extended meter/regulator
assembly. above
3 feet (91 cm) within a height 15 feet
(4.57 m) above the meter/regulator
assembly.
*
I = Clearance to service regulator
coaxial vent outlet.
3 feet (91 cm) *
J = Clearance to nonmechanical air
supply inlet to the combustion air
inlet to any building or other
appliance.
6 inches (15 cm) for appliances <
10,000 Btuh (3 kW), 12 inches (30 cm)
for appliances > 10,000 Btuh (3kW)
and <
100,000 Btuh (30kW), 36 inches
(91 cm) for appliances > 100,000 Btuh
(30kW).
6 inches (15 cm) for appliances <
10,000
Btuh (3 kW), 9 inches (23 cm) for
appliances > 10,000 Btuh (3kW) and <
50,000 Btuh (15kW), 12 inches (30 cm)
for appliances > 50,000 Btuh (15kW).
K = Clearance to mechanical air
supply inlet.
6 feet (1.83 m)
3 feet (91 cm) above if within 10 feet
(3 m) horizontally.
L = Clearance above paved sidewalk
or paved driveway located on
public property.
Not Allowed Not Allowed
M = Clearance under veranda, porch,
deck or balcony.
Not Allowed Not Allowed
Canadian Installations
1
US Installations
2
A= Clearance above grade, veranda,
porch, deck or balcony.
12 inches (30 cm) above anticipated
snow level.
12 inches (30 cm) above anticipated
snow level.
B= Clearance to window or door that
may be opened.
6 inches (15 cm) for appliances <
10,000
Btuh (3 kW), 12 inches (30 cm) for
appliances > 10,000 Btuh (3kW) and <
100,000 Btuh (30kW), 36 inches (91 cm)
for appliances > 100,000 Btuh (30kW).
6 inches (15 cm) for appliances <
10,000 Btuh (3 kW), 9 inches (23 cm)
for appliances > 10,000 Btuh (3kW)
and <
50,000 Btuh (15kW), 12 inches
(30 cm) for appliances > 50,000 Btuh
(15kW).
C= Clearance to permanently closed
window.
* *
D= Vertical Clearance to ventilated
soffit located above the terminal
within a horizontal distance of 2
feet (61 cm) from the center line
of the terminal.
* *
E= Clearance to unventilated soffit.
* *
F= Clearance to outside corner.
* *
G= Clearance to corner.
* *
11
v
A
D
E
V
B
V
L
C
IXED
F
v
OSED
L
C
R
E
P
O
v
F
B
B
B
LE
AB
FIXE
LE
CLO
B
RA
E
P
O
v
v
J
B
A
H
B
D
v
ED
S
X
I
X
v
K
M
Installing the water heater:
Additional Considerations
Do NOT install vent terminal under any patio or deck.
To help prevent moisture from freezing on walls and under
eaves, do not locate vent terminal on the side of a building with
prevailing winter winds.
To help prevent water lines from freezing, do not locate vent
terminal on the side of a building with prevailing winter winds.
Do NOT terminate vent directly on brick or masonry surfaces. A
rust resistant sheet metal backing plate ( 1 x 1 foot) (30 x 30 cm) is
recommended behind vent. See figure on left.
Do NOT locate vent terminal too close to shrubbery, as flue gases
may damage them.
Caulk all cracks, seams and joints within six (6) feet (1.8 m) of vent
terminal.
Caulk around wall face plate for weather tight seal.
All painted surfaces should be primed to lessen the chance of
physical damage. Painted surfaces will require maintenance.
Insulate vent pipe of water heaters exposed to cold conditions
(attics, crawl spaces, etc.) with inflammable material to help prevent
moisture from accumulating in the vent pipe. The insulation should
be rated for the temperature and should not contain substances that
corrode the vent pipe.
Do NOT extend exposed vent pipe of indoor water heaters outside
of building.
Guard vent against accidental contact with people and pets.
Indoor Water Heater
12
WARNING: Moisture in the flue gas will condense as it
leaves the vent terminal. In cold weather this condensate can
freeze on the exterior wall, under the eaves and on
surrounding objects. Some discoloration to the exterior of
the building is to be expected. However, improper location
or installation can result in severe damage to the structure
or exterior finish of the building.
Inside
Corner
Caulk
6’ (1.8 m)
Caulk Zone
If soffit vent is too close,
block off and install new
vent at another location.
Caulk
Caulk
Rising moisture will collect
under eaves.
6’
4’
1 ft. sq. (30 x 30 cm) sheet metal plate on
brick or masonry surface, recommended.
(1.8 m)
6’ (1.8 m)
Caulk
zone or to edge of window
etc.,starting within 6’ (1.8 m).
RTV silicone caulk
(1.2 m)
WARNING: For multiple unit installation, a minimum
distance between vent terminations must be maintained to
prevent recirculation of vent gases. Maintain a center-tocenter distance between vent terminations of 19 inches (48
cm) for two unit installation. Maintain a center-to-center
distance between vent terminations of 21 inches (53 cm) for
three or more unit installation.
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