John Wood Power Direct Vent User Manual
POWER DIRECT VENT WATER HEATER
WARNING:
Improper installation, adjustment, alteration, service, or maintenance can cause
injury or property damage. Refer to this
manual. For assistance or additional information, consult a qualified installer, service agency, or the gas utility.
FOR YOUR SAFETY
• Do not store or use gasoline or other
flammable vapours and liquids in the
vicinity of this or any other appliance.
• Installation and service must be performed by a qualified installer, service
agency or the gas utility.
INSTALLATION AND
OPERATING INSTRUCTIONS
Read these instructions thoroughly before starting
WARNING:
If the information in these instructions is
not followed exactly, a fire or explosion
may result causing property damage, personal injury or death.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do
not use any phone in your building.
• Immediately call your gas supplier from
a neighbor’s phone. Follow the gas
supplier’s instructions.
• If you cannot reach your gas supplier,
call the fire department.
PART No. 324330-001 (13-08)
This page intentionally left blank. May be used for notes or to record other installation information.
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TABLE OF CONTENTS
I) INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . .4
User Responsibilities 4
II) SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
For Installations in Canada: 5
For Installations in the United States: 5
Safety Warning (Flammable Vapours) 5
Safety Warning (Scalding) 5
Relief Valve Requirements (T&P) 6
III) INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Unpacking the Water Heater 6
Location Requirements 6
Site Location 6
Clearances and Accessibility 7
In Earthquake Zones
Gas Supply 7
Gas Requirements
Gas Piping
Gas Pressure
Gas Pressure Testing
Venting 8
Vent Pipe Material
Vent Pipe Connection to Blower
Vent Pipe Installation
Vent Pipe Length
Vent Pipe Runs
Vent Pipe Termination
Vent Terminal Installations
Side Wall Vent Terminal Installation
Vertical Vent Terminal Installation
Concentric Vent Termination Kit Installation
Multiple Concentric Vent Installations
Water Supply 13
Piping Installation
Closed System/Thermal Expansion
Temperature and Pressure (T&P) Relief Valve 14
The Temperature and Pressure Relief Valve:
The Discharge Line:
Electrical Supply 14
Resettable Lockout 15
Installation Checklist 18
IV) LIGHTING & OPERATING INSTRUCTIONS . . . . .19
Lighting Instructions (Robertshaw) 19
First Lighting 20
Gas Control
Robertshaw 2000N WDER Operation
Temperature Adjustment
Lighting Instructions (White-Rodgers) 22
Gas Control/Thermostat
Putting the Heater into Service
Temperature Adjustment
Heater Shutdown
System Error Codes
TM
Intelli-Vent
System Error Codes
V) OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Water Heater Operation 26
Burner Flames 26
Stacking 26
Emergency Shut Down 26
Operational Conditions 26
Condensation
Water Heater Sounds
Smoke/Odour
Anode Rod/Water Odour
VI) MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Draining and Flushing 28
Routine Preventative Maintenance 28
Temperature and Pressure Relief Valve 28
Replacement Parts 28
VII) COMBO HEATING . . . . . . . . . . . . . . . . . . . . . . . . .29
System Requirements 29
Installation 30
VIII) TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . .31
Robertshaw 2000N WDER and
White-Rodgers Intelli-Vent
TM
31
IX) PARTS REFERENCE ILLUSTRATION . . . . . . . . .32
LIMITED WARRANTY . . . . . . . . . . . . . . . . . . . . . .33
RETAIN THESE INSTRUCTIONS IN A SAFE LOCATION FOR FUTURE REFERENCE
– 3 –
Your safety and the safety of others is very important.
We have provided many important safety messages in this manual and on your appliance.
Always read and obey all safety messages.
This is the safety alert symbol.
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” or “WARNING”.
DANGER
You can be killed or seriously injured if you don’t immediately follow
instructions.
WARNING
You can be killed or seriously injured if you don’t follow instructions.
All safety messages will tell you what the potential hazard is, tell you how to reduce the
chance of injury, and tell you what can happen if the instructions are not followed.
CAUTION
Hydrogen gas can be produced in a hot water system served by this heater that has not been used
for a long period of time (generally two (2) weeks or more). Hydrogen gas is extremely flammable
and can ignite when exposed to a spark or flame. To reduce the risk of injury under these conditions, it is recommended that the hot water faucet be opened for several minutes at the kitchen sink
before using any electrical appliance connected to the hot water system. Use caution in opening
faucets. If hydrogen is present, there will probably be an unusual sound such as air escaping through
the pipe as the water begins to flow. There should be no smoking or open flame near the faucet at
the time it is open.
Do not use this appliance if any part has been under water. Immediately call a qualified service technician. Water heaters subjected to flood conditions or anytime the gas controls, main burner or pilot
have been submerged in water require replacement of the entire water heater.
The California Safe Drinking Water and Toxic Enforcement Act requires the Governor of California to
publish a list of substances known to the State of California to cause cancer, birth defects, or other
reproductive harm, and requires businesses to warn of potential exposure to such substances.
WARNING: This product contains a chemical known to the State of California to cause cancer, birth
defects, or other reproductive harm.
This appliance can cause low-level exposure to some of the substances listed, including formaldehyde, carbon monoxide, and soot.
I) INTRODUCTION
Thank you for purchasing a Power Direct Vented Water
Heater. Properly installed and maintained, it will provide
years of trouble free service.
This gas-fired water heater has been developed to produce
potable hot water for normal residential demands and may
also be used in combination with space heating applications. Any deviation from these applications could affect your
warranty.
User Responsibilities
This manual has been prepared to acquaint you with the
installation, operation and maintenance of your gas water
heater and provide important safety information in these
areas. It is your responsibility to ensure that your water
heater is properly installed and cared for.
– 4 –
FAILURE TO FOLLOW THE INSTRUCTIONS IN THIS
MANUAL MAY RESULT IN SERIOUS BODILY INJURY
AND/OR PROPERTY DAMAGE. THOROUGHLY READ
AND UNDERSTAND ALL INSTRUCTIONS BEFORE YOU
ATTEMPT TO INSTALL, OPERATE OR MAINTAIN THIS
HEATER.
Installation and service requires trade knowledge in the
areas of plumbing, electricity, venting, air supply and gas
supply. If you lack these skills, or have difficulty understanding these instructions, you should not proceed. Enlist the
help of a qualified service technician to install this water
heater.
Examples of qualified service technicians include those
trained in the plumbing and heating industry, local gas utility
personnel, or an authorized service person.
Service to the Power Direct Vent System should only be
performed by a qualified service technician.
Safety Warning (Flammable Vapours)
The manufacturer and seller of this water heater will not
assume any liability for any property damage, personal
injury or death resulting from improper sizing, installation or
failure to comply with these instructions.
The warranty on this water heater is in effect only when the
water heater is installed and operated in accordance with
these instructions. A data plate identifying your water heater
can be found next to the gas control/thermostat. When referring to your water heater, always have the information listed
on the data plate readily available.
Protect your warranty: Regularly service your water heater
as directed in the "Maintenance" section of this manual.
Retain your original receipt as proof of purchase.
Do not discard this manual. You or future users of this
water heater will need it for reference.
II) SAFETY
This water heater is design-certified by CSA International as
a Category I, direct vented water heater which takes its combustion air from the outside of the structure and exhausts all
products of combustion to the outside of the structure.
In addition to the installation instructions found in this manual, the water heater must be installed in accordance with
all local and provincial or state codes or, in the absence of
such, with the latest editions of the following specifications.
For Installations in Canada:
“Natural Gas and Propane Installation Code” CSAB149.1 and
“Canadian Electrical Code (CAN/CSA C22.1), Part I”
available from:
Canadian Standards Association,
5060 Spectrum Way,
Mississauga, Ontario, Canada
L4W 5N6
For Installations in the United States:
“National Fuel Gas Code” ANSI Z223.1 (NFPA 54) and
“National Electrical Code” (NFPA 70)” available from:
American National Standards Institute,
25 West 43rd Street,
New York, NY 10036
Massachusetts code requires this water heater to be
installed in accordance with Massachusetts Plumbing and
Fuel Gas Code 248 CMR Section 2.00 and 5.00.
WARNING
FLAMMABLES
FIRE AND EXPLOSION HAZARD
Can result in serious injury or death
Do not store or use gasoline or other flammable vapours and liquids
in the vicinity of this or any other appliance. Storage of or use of gasoline
or other flammable vapours or liquids in the vicinity of this or any other
appliance can result in serious injury or death.
There is a risk of property damage, personal injury or death
from the by-products of combustion (e.g., flue gases), in
using fuel-burning appliances such as water heaters. Areas
that may not be suitable for water heater installation include
those where flammable liquids, gasoline, solvents, adhesives etc. are stored, or where engine-driven equipment or
vehicles are stored, operated or repaired. These, and similar
products, should not be stored or used near the water heater
or air intake. Due to the nature of air movement, flammable
vapours can be carried some distance from the point of storage. The gas-fired water heater igniter or burner flame can
ignite these vapours causing a flashback, fire or explosion,
which may result in severe property damage, serious personal injury or death. If flammable liquids or vapours have
spilled or leaked in the area of the water heater, leave the
area immediately and call the fire department from a neighbor’s home. Do not attempt to clean the spill until all ignition
sources have been extinguished.
Safety Warning (Scalding)
Hot water produced by this appliance can cause severe
burns due to scalding. The hazard is increased for young
children, the aged or the disabled when water temperatures
exceed 52°C (125°F). Use tempering valves, also known as
mixing valves, in the hot water system to reduce the risk of
scalding at point-of-use such as lavatories, sinks and bathing facilities. Such precautions must be followed when this
heater is operated in combination with dishwashing or space
heating applications.
Flammable Vapours
DANGER
Check your phone listings for the local authorities having
jurisdiction over your installation.
– 5 –
Relief Valve Requirements (T&P)
All water heaters must be fitted with a proper temperature
and pressure relief valve. These valves must be certified
as meeting the requirements of the “Standard For Relief
Valves For Hot Water Supply Systems, ANSI Z21.22/
CSA 4.4”.
MAKE SURE THE FLOW OF COMBUSTION AND
VENTILATION AIR IS NOT RESTRICTED.
If this water heater has been exposed to flooding, freezing,
fire or any unusual condition, do not put it into operation until
it has been inspected and approved by a qualified service
technician.
THESE CONDITIONS CAN RESULT IN UNSEEN
INTERNAL DAMAGE and are not subject to warranty cov-
erage.
III) INSTALLATION
Unpacking the Water Heater
WARNING
Excessive Weight Hazard
Use two or more people to move and install
water heater. Failure to do so can result in
back or other injury.
IMPORTANT:
This water heater must be installed strictly in accordance
with the instructions enclosed, and local electrical, fuel
and building codes. It is possible that connections to
the water heater, or the water heater itself, may develop
leaks. IT IS THEREFORE IMPERATIVE that the water
heater be installed so that any leakage of the tank or
related water piping is directed to an adequate drain in
such a manner that it cannot damage the building, furniture, floor covering, adjacent areas, lower floors of the
structure or other property subject to water damage. This
is particularly important if the water heater is installed in
a multi-story building, on finished flooring or carpeted
surfaces. THE MANUFACTURER WILL NOT ASSUME
ANY LIABILITY for damage caused by water leaking from
the water heater, pressure relief valve, or related fittings.
Select a location as centralized within the piping system
as possible. In any location selected, it is recommended
that a suitable drain pan be installed under the water
heater. This pan must limit the water level to a MAXIMUM
depth of 45mm (1 3/4 in.) and have a diameter that is a
minimum of 50mm (2 in.) greater than the diameter of the
water heater. Suitable piping shall connect the drain pan
to a properly operating floor drain. When used with a fuelfired heater, this drain pan must not restrict combustion
air flow.
Important: Do not remove any permanent instructions,
labels, or the data label from outside of the water heater or
on the inside of panels.
• Remove exterior packaging and place installation com-
ponents aside.
• Inspect all parts for damage prior to installation and start-
up.
• Completely read all instructions before attempting to
assemble and install this product.
If you observe damage to the water heater or any of its components, DO NOT ASSEMBLE OR INSTALL IT OR MAKE
ANY ATTEMPT TO FIX THE DAMAGED PART(S). Contact
the place of purchase for further instructions.
• After installation, dispose of packaging material in the
proper manner.
Location Requirements
Do not use or store flammable products such as gasoline,
solvents or adhesives in the same room or area near the
water heater. If such flammables must be used, all gas burning appliances in the vicinity must be shut off and their pilot
lights extinguished. Open the doors and windows for ventilation while flammable substances are in use.
Site Location
The water heater must be installed indoors and in a verti-
•
cal position on a level surface.
• Maximum ambient temperature 50°C (122°F).
Note: The water heater may be installed in a closet with
a door off a bedroom or bathroom providing the units are
installed and vented per the manufacturer’s instructions.
– 6 –
• Consider the air intake and exhaust vent system piping
• Locate the water heater near the existing gas piping. If
Note: This water heater must be installed in accordance
with all local and provincial or state codes or, in the absence
of such, the latest edition of “Natural Gas and Propane
Installation Code” CSA-B149.1 (Canada), or “National
Fuel Gas Code” ANSI Z223.1 (NFPA 54) (U.S.A.).
45mm MAX
(1 3/4 in.)
AT LEAST 50mm (2 in.)
GREATER THAN THE
WATER HEATER AND
BOTTOM AIR BOX.
Figure 1. Drain Pan Installation
when selecting the water heater location. The venting
system must be able to run from the water heater to the
termination with a minimal length and number of elbows.
The venting system must comply with the requirements
set forth in the venting section of this manual.
installing a new gas line, locate the water heater to minimize the pipe length and elbows.
PIPE TO
ADEQUATE
DRAIN
• The water heater should be located in an area not sub-
ject to freezing temperatures. Water heaters located in
unconditioned spaces (i.e., attics, basements, etc.) may
require insulation of the water piping and drain piping
to protect against freezing. The drain and controls must
be easily accessible for operation and service. Maintain
proper clearances as specified on the data plate.
Clearances and Accessibility
VENT
BACK
TOP TO
CEILING
SIDES
Gas Supply
DANGER
Explosion Hazard
• Use a new CSA approved gas supply line.
• Install a gas supply shut-off valve.
• Do not connect a natural gas water heater
to a L.P. gas supply.
• Do not connect a L.P. gas water heater to
a natural gas supply
• Failure to follow these instructions can
result in death, an explosion or carbon
monoxide poisoning.
SIDES
FRONT 610mm
(24 in.) MIN.
FOR SERVICE
Figure 2. Minimum Clearance Locations
• The minimum clearances between the heater and com-
bustible materials are:
Top 406mm (16 in.)
Front 100mm (4 in.)
Rear and Sides 25mm (1 in.)
Vent Pipe through Wall 0mm (0 in.)
Note: These requirements are also listed on the data plate
located on the front of the water heater.
• The water heater is certified for installation on a combus-
tible floor.
Important: If installing over carpeting, the carpeting must
be protected by a metal or wood panel beneath the water
heater. The protective panel must extend beyond the full
width and depth of the water heater by at least 76mm (3 in.)
in any direction or if in an alcove or closet installation, the
entire floor must be covered by the panel.
Figure 2 may be used as a reference guide to locate the
specific clearance locations. A minimum of 610mm (24 in.)
of front clearance and 100mm (4 in.) on each side should be
provided for inspection and service.
In Earthquake Zones
Note: The water heater must be braced, anchored, or
strapped to avoid moving during an earthquake. Contact
local utilities for code requirements in your area.
Gas Requirements
Read the data plate to be sure the water heater is made
for the type of gas you will be using in your home. This
information will be found on the data plate located near the
gas control valve. If the information does not agree with the
type of gas available, do not install or light. Call your dealer.
Note: An odourant is added by the gas supplier to the gas
used by this water heater. This odourant may fade over an
extended period of time. Do not depend upon this odourant
as an indication of leaking gas.
Gas Piping
This gas piping must be installed in accordance with all local
and provincial or state codes or, in the absence of such, the
latest edition of “Natural Gas and Propane Installation
Code” CSA-B149.1 (Canada), or “National Fuel Gas
Code” ANSI Z223.1 (NFPA 54) (U.S.A.).
Note: When installing gas piping, apply sealing compounds
approved for use with natural and propane gas.
MANUAL
GAS
SHUT-OFF
GROUND-
JOINT UNION
76mm
(3 in.)
GAS
CONTROL/
THERMOSTAT
SEDIMENT
TRAP (DIRT
LEG)
– 7 –
Figure 3. Gas Piping
1. Install a readily accessible manual shut-off valve in the
gas supply line as recommended by the local utility. The
owner/operator must be shown the location of this valve
and be given instructions on how to use it to shut off the
gas to the heater.
2. Install a sediment trap (dirt leg) (if not already incorporated
as part of the water heater) as shown. The sediment trap
(dirt leg) must be no less than 76mm (3 in.) long for the
accumulation of dirt, foreign material, and water droplets.
3. Install a ground joint union between the gas control/
hermostat and the manual shut-off valve. This is to allow
easy removal of the gas control/thermostat.
4. Turn the gas supply on and check for leaks. Use a
chloride-free soap and water solution (bubbles forming
indicate a leak) or other approved method.
Gas Pressure
WARNING
Exposure to a higher gas supply pressure
may cause damage to the control, resulting
in explosion or fire. Consult your local gas
supplier and gas authorities. DO NOT PUT
INTO SERVICE IF OVER-PRESSURIZATION
HAS OCCURRED.
Important: The gas supply pressure must not exceed the
maximum supply pressure as stated on the water heater’s
data plate.
Gas Pressure Testing
Important: This water heater and its gas connection must
be leak tested before placing the appliance in operation.
• If the code requires the gas lines to be tested at a pres-
sure exceeding 14 in. w.c. (3.5 kPa), the water heater
and its manual shut-off valve must be disconnected from
the gas supply piping system and the line capped.
• If the gas lines are to be tested at a pressure less than
14 in. w.c. (3.5 kPa), the water heater must be isolated
from the gas supply piping system by closing its manual
shut-off valve.
U.L. recognized fuel gas and (CO) detectors are recommended in all applications and should be installed using
the manufacturer’s instructions and local codes, rules, or
regulations.
Note: Air may be present in the gas lines and could prevent
the burner from lighting on initial start-up. The gas lines
should be purged of air by a qualified service technician
after installation of the gas piping system.
Venting
This water heater has a direct vent system in which all air
for combustion is taken from the outside atmosphere and all
combustion products are discharged to the outdoors.
This water heater must be properly vented for removal of
exhaust gases to the outside atmosphere. Correct installation of the vent pipe system is mandatory for the safe and
efficient operation of this water heater and is an important
factor in the life of the unit.
A Vent Kit included with this water heater consists of:
1. Two (2) 45° Vent Termination Elbows,
2. Two (2) more restrictive Vent Termination Screens,
3. Two (2) less restrictive Vent Termination Screens,
4. Air intake adapter (3 in. to 2 in. ABS reducer),
5. Blower outlet adapter (rubber coupling and gear clamps).
Vent pipe must be installed in accordance with all local and
provincial or state codes or, in the absence of such, the
latest edition of “Natural Gas and Propane Installation
Code” CSA-B149.1 (Canada), or “National Fuel Gas
Code” ANSI Z223.1 (NFPA 54) (U.S.A.).
Important: Check to make sure the vent pipe is not blocked
in any way.
Note: Do not common vent this water heater with any other
appliance. Do not install in the same chase or chimney with
a metal or high-temperature plastic from another gas or fuel
burning appliance.
DANGER
Carbon Monoxide Warning
• Follow all vent system requirements by
the local authorities having jurisdiction
over your installation.
• Failure to do so can result in death, explosion or carbon monoxide poisoning.
Vent Pipe Material
The following plastic materials may be used for both the
combustion air intake and exhaust vent system subject to
local and provincial or state codes:
• This heater is certified to be installed using Schedule 40
PVC or CPVC or polypropylene plastic vent material for
the exhaust. In Canada, the exhaust vent material must
be approved to ULC S636. ULC S636 mandates that
components from different systems must not be mixed in
the same vent runs. The combustion air intake material
may be PVC, ABS, CPVC or polypropylene. Check local
codes to determine which materials are allowed in your
area and only use approved material. All venting material and components must be joined with the approved
primer/cleaner and solvent cement. Do not cement the
venting system to the heater.
Note: Use only solid (not foam core) piping. Plastic pipe
and fittings are available through most plumbing suppliers.
Always check the marking on the pipe to make sure you are
using the correct material.
– 8 –
Vent Pipe Connection to Blower
A rubber coupling and gear clamps are supplied (Vent Kit)
with the water heater to connect the exhaust vent system to
the blower.
Important: These connections must be properly sealed to
prevent the leakage of the products of combustion into the
living area.
Vent Pipe Installation
The following guidelines should be followed when installing
the air intake and exhaust vent system:
• Venting should be as direct as possible with a minimum
number of pipe fittings.
• Vent diameter must not be reduced unless specifically
noted in the installation instructions.
• Support all horizontal pipe runs every 1.2m (4 ft.) and all
vertical pipe runs every 1.5m (5 ft.) or according to local
codes.
• Vents run through unconditioned spaces where below
freezing temperatures are expected, are not recommended.
• Vents run through unconditioned spaces inside a building
may result in the condensation of flue gases during the
winter season. The rubber coupling joined to the blower
includes a nipple with a yellow cap. In installations such
as this connect a condensation trap to this nipple.
The combustion air intake and exhaust vent system and
termination may be installed in one of the following type
terminations:
1. Horizontal (2 Pipe) (air intake and exhaust vent)
2. Vertical (2 Pipe) (air intake and exhaust vent)
3. Concentric Vent Termination (using Concentric Vent Kit
side wall termination only).
All pipe, fittings, pipe cement, primers and procedures
must conform to American National Standard Institute and
American Society for Testing and Materials (ANSI/ASTM)
standards in the United States. This water heater has been
design certified by CSA International for use with the specified (CSA) listed plastic vent pipe.
CAUTION:
Use of Solvent Cement and Primer
• Use only in well-ventilated areas.
• Do not use near flame or open fire.
• Use only the Solvent Cement and Primer
appropriate for the venting material being
used.
• Solvent cements for plastic pipe are flammable liquids and must be kept away from
all sources of ignition.
Do not use solvent cement to connect the exhaust vent system to the blower. Use the rubber coupling and gear clamps
instead. This connection must be removable to service the
heater. All other joints in the air intake and exhaust vent
systems must be properly cemented. Use an appropriate
solvent cement to connect the 3 in. to 2 in adapter/reducer
to air intake on the water heater.
1. Cut the pipe end square and remove all ragged edges
and burrs. Make sure the inside of the pipe is clean and
free of cuttings and loose dirt. Chamfer the end and apply
primer to the fi tting and pipe.
2. Using a suitable grade of pipe cement, apply a moderate,
even coat inside the fi tting. Apply a liberal amount of
cement to the outside of the pipe to socket depth.
Note: It is important to select the proper pipe cement for the
type plastic pipe being used.
3. Assemble the parts quickly while the cement is still wet.
Twist the pipe 1/4 turn during insertion and hold for 30
seconds.
Vent Pipe Length
The maximum allowable pipe lengths for air intake and
exhaust are listed in Table 1. The specified maximum
lengths are for each of the intake and exhaust systems and
not for the combined lengths of both systems. In addition,
each system requires a 45° long sweep elbow termination
with a restrictive screen. Minimum pipe length is 900mm (3
ft.) with a minimum of one 90° elbow per side.
1. Determine termination type and pipe size.
2. Determine number of elbows in vent system. Do not
include termination elbow. Calculate the maximum
equivalent length of the exhaust and air intake system.
MODEL
NUMBER
4040SN-PDV
5040SN-PDV
5065SN-PDV 76mm (3 in.) 9.2m (30 ft.) 15.3m (50 ft.)
Notes:
3. Vent lengths shown do not include vent termination
elbow.
4. A horizontal vent must have a 45° vent termination
elbow to direct the vent pipe downward.
5. A vertical vent must have a 90° vent termination elbow
to direct the vent pipe horizontally followed by a 45°
elbow to direct the vent pipe downward.
6. If additional elbows are used in the vent system the
allowable vent lengths are reduced (see chart below).
7. Two 45° elbows are considered the equivalent of one
90° elbow.
Equivalent lengths of straight pipe for various elbows
using Schedule 40 PVC or CPVC or polypropylene.
SIZE TYPE
50mm (2 in.) 90° 2.44m (8 ft.) 1.52m (5 ft.)
76mm (3 in.) 90° 2.44m (8 ft.) 1.52m (5 ft.)
50mm (2 in.) 45° 1.22m (4 ft.) 0.76m (2.5 ft.)
76mm (3 in.) 45° 1.22m (4 ft.) 0.76m (2.5 ft.)
Table 1. Maximum Allowable Vent Lengths
VENT PIPE
DIAMETER
50mm (2 in.) 15.2m (50 ft.) 15.2m (50 ft.)
76mm (3 in.) 30.5m (100 ft.) 30.5m (100 ft.)
50mm (2 in.) 15.2m (50 ft.) 15.2m (50 ft.)
76mm (3 in.) 30.5m (100 ft.) 30.5m (100 ft.)
CONCENTRIC
VENT
LENGTH
SHORT
SWEEP/
RADIUS
2 PIPE VENT
LENGTH
LONG
SWEEP/
RADIUS
– 9 –
Vent Pipe Runs
WARNING
This unit includes an air intake terminal and
an exhaust vent terminal.
1. The exhaust vent system must not, under any circumstances, be run downhill then run uphill thus forming a
valley. It may leave a space to accumulate condensation
and block vent pipe.
2. Horizontal runs require a minimum 3mm (1/8 in.) rise
per 1.5m (5 ft) and a support every 1.2m (4 ft.). Ensure
there is enough height between heater and termination
to raise vent pipe runs the required distance.
3. Vertical runs require a support every 1.5m (5 ft.) that
must provide proper support to prevent stress on the
pipes.
Vent Pipe Termination
This water heater includes one (1) pair of more restrictive
Vent Termination Screens and one (1) pair of less restrictive
Vent Termination Screens. For safety and optimum efficiency performance, ensure the correct Vent Termination Screen
is installed for the vent length in your installation.
Note: Before installing the Power Direct Vent Water Heater,
it is recommended that the location of the pipe terminations
(air intake and exhaust vent) be determined.
Use the more restrictive Vent Termination Screen shown
in Figure 5 when the equivalent vent length (see Table 1)
is between 2.1 and 7.6m (7 and 25 ft.). Install the Vent
Termination Screen in the Termination Elbow as shown, on
both the air intake pipe and the exhaust pipe.
90° SHORT SWEEP ELBOW
(MORE RESTRICTIVE)
Figure 4. Correct Pipe Fittings
90° LONG SWEEP ELBOW
(LESS RESTRICTIVE)
Figure 5. Vent Termination Screen (more restrictive)
for equivalent vent lengths from 2.1 to 7.6m
(7 to 25 ft.).
Use the less restrictive Vent Termination Screen shown
in Figure 6 when the equivalent vent length (see Table 1)
is between 7.6 and 15.2m (25 and 50 ft.). Install the Vent
Termination Screen in the Termination Elbow as shown, on
both the air intake pipe and the exhaust pipe.
– 10 –
Figure 6. Vent Termination Screen (less restrictive)
for equivalent vent lengths from 7.6 to
15.2m (25 to 50 ft.).
Vent Terminal Installations
Important: The vent system must terminate so that proper
clearances are maintained as cited in local codes or the
latest edition of “Natural Gas and Propane Installation
Code” CSA-B149.1 (Canada), or “National Fuel Gas
Code” ANSI Z223.1 (NFPA 54) (U.S.A.).
In addition, the manufacturer recommends the vent terminal
not to be installed closer than 150mm (6 in.) from an inside
or outside corner.
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 “Location Of Heater” and with the latest
edition of “Natural Gas and Propane Installation Code”
CSA-B149.1 (Canada), or “National Fuel Gas Code” ANSI
Z223.1 (NFPA 54) (U.S.A.) and local codes.
Side Wall Vent Terminal Installation
Important: When terminating the vent on a side wall, the
following specifications pertaining to terminal location must
be followed (see Figure 7).
1. The air intake terminal and the exhaust vent terminal must
terminate on the same exterior wall.
2. The vertical centerline of the air intake terminal must be
located at a minimum of 203mm (8 in.) and not more than
610mm (24 in.) from the vertical centerline of the exhaust
vent terminal.
3. The horizontal centerline of the air intake terminal may not
be located more than 100mm (4 in.) below the horizontal
centerline of the exhaust vent terminal.
SIDE WALL
EXHAUST
VENT
TERMINAL
C
L
203mm (8 in.) MIN,
610mm (24 in.) MAX.
C
L
INTAKE
VENT
TERMINAL
C
L
C
L
100mm
(4 in.) MAX
Figure 7. Side Wall Vent Termination
Vertical Vent Terminal Installation
Important: When terminating the vents through a roof, the
following specifications pertaining to terminal location must
be followed (see Figure 8).
1. The air intake termination and the exhaust vent
termination shall extend above anticipated snow level or
at least 457mm (18 in.) above the roof.
2. Must provide proper support for all pipes protruding
through roof.
3. The vertical roof terminations should be sealed with a
plumbing roof boot or equivalent fl ashing.
4. The air intake termination and the exhaust vent termination
must penetrate the same side of roof.
5. The centerline of the air intake termination and the
centerline of the exhaust vent termination must not be
closer than 203mm (8 in.) and not farther away than
610mm (24 in.).
6. The air intake terminal and the exhaust vent terminal must
be oriented facing downward and the same direction.
– 11 –
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