John Wood Power Vent User Manual

PART NO. 71189 REV. G (09-06)
WARNING:
If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, per­sonal injury or death.
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.
• 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.
WHAT TO DO IF YOU SMELL GAS
GSW Water Heating is a division of A. O. Smith Enterprises Ltd.
POWER VENTED WATER HEATER
INSTALLATION AND
OPERATING INSTRUCTIONS
Read these instructions thoroughly before starting
– 2 –
TABLE OF CONTENTS
I) INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
User Responsibilities 3
II) SAFETY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
For Installations in Canada: 4 For Installations in the United States: 4 Safety Warning (Flammable Vapours) 4 Safety Warning (Scalding) 4 Safety Warning (Carbon Monoxide) 4 Relief Valve Requirements (T&P) 5 Flooding/Freezing 5
III) INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Unpacking the Water Heater 5 Location Requirements 5
In Earthquake Zones
Closet Installation & Floor Surfaces Clearances and Accessibility 6 Gas Supply 6
Gas Supply Pressure
Gas line purging
Gas Leak Testing
Gas Operating Pressures Air Requirements 8 Confined Space Air Requirements for Canadian Installations 8 Confined Space Air Requirements for U.S. Installations 9 Exhaust Venting 10
Important Notes and Warnings
Venting terminations and sizing
Venting instructions
Vent pipe connection to blower Water Supply 15
Piping Installation
Filling the Water Heater
Closed System/Thermal Expansion Temperature and Pressure (T&P) Relief Valve 16
The Temperature and Pressure Relief Valve:
The Discharge Line/Driptube: Electrical Supply 17 Flammable Vapour Sensor 18 Resettable Lockout 19 Water Heater Operation 19 Installation Checklist 20
IV) OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . 21
Temperature Regulation 21 Mixing Valves 21 Lighting Instructions (Robertshaw) 22
Gas Control/Thermostat
Putting the Heater into Service
Temperature Adjustment
Heater Shutdown
System Error Codes
Lighting Instructions (White-Rodgers) 24
Gas Control/Thermostat Putting the Heater into Service Temperature Adjustment Heater Shutdown System Error Codes Intelli-Vent
TM
System Error Codes
V) OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Burner Flames 28 Operational Conditions 28
Condensation Water Heater Sounds Smoke/Odour Anode Rod/Water Odour
VI) MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Draining and Flushing 28 Anode Rod Replacement 29 Routine Preventative Maintenance 29 Gas Control 29 Temperature and Pressure Relief Valve 29 Venting System and Blower 30
VII) COMBO HEATING . . . . . . . . . . . . . . . . . . . . . . . . 31
System Requirements 31 Installation 31
VIII) TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . 32
Robertshaw 2000WDER and White-Rodgers Intelli­Vent
TM
32
IX) REFERENCE PARTS . . . . . . . . . . . . . . . . . . . . . . 33
Reference Parts Listing 33 Parts Reference Illustration 34
LIMITED WARRANTY. . . . . . . . . . . . . . . . . . . . . . 37
RETAIN THESE INSTRUCTIONS IN A SAFE LOCATION FOR FUTURE REFERENCE
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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.
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.
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
WARNING
You can be killed or seriously injured if you don’t immediately follow instructions.
You can be killed or seriously injured if you don’t follow instructions.
I) INTRODUCTION
Thank you for purchasing a Flammable Vapour Ignition Resistant Power Vented Water Heater. This water heater
is designed to reduce the risk of flammable vapour related fires by shutting the burner down before flammable vapours get into the water heater combustion chamber. This is achieved by the means of the flammable vapour sensor. 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 fired 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.
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 Vent System should only be per­formed by a qualified service technician.
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. Adata plate identifying your water heater can be found above 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 CSAInternational as a Category III, non-direct vented water heater that takes its combustion air either from the installation area or from air ducted to the unit from the outside.
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" CAN/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.
Check your phone listings for the local authorities having jurisdiction over your installation.
Safety Warning (Flammable Vapours)
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 simi-
lar 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 (see Figure 17). Such precautions must be followed when this heater is operated in combination with dishwashing or space heating applications.
Safety Warning (Carbon Monoxide)
As with all fuel burning equipment, this heater requires an adequate supply of air for combustion and ventilation. An insufficient air supply can result in poor combustion or the re-circulation of the flue gases. Such a condition can cause soot build-up and present a fire hazard. Flow reversal of flue gases can cause an increase of carbon monoxide inside of the dwelling that could result in serious bodily harm or death from asphyxiation.
MAKE SURE THE FLOW OF COMBUSTION AND VENTI­LATION AIR IS NOT RESTRICTED.
WARNING
Flammable Vapours
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.
DANGER
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.
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Relief Valve Requir ements (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".
Flooding/Freezing
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 coverage.
III) INSTALLATION
Unpacking the Water Heater
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 com­ponents 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
The water heater must be installed indoors in an area not subject to freezing temperatures and in a vertical position on a level surface. Water heaters located in unconditioned spaces (e.g., attics, basements etc.) may require insulation of the water piping, drain piping and venting to protect against condensation. The power vented series of water heaters are designed to vent the products of combustion horizontally through the wall or vertically through the roof. The blower expels the products of combustion by means of plastic piping to the outdoors without the need for a con­ventional chimney. Select a location as centralized within the piping system as possible. The heater should be located in an area where leakage of the tank or connections will not result in damage
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 plumbing 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. GSW 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 fuel-fired heater, this drain pan must not restrict combustion air flow.
WARNING
Excessive Weight Hazar d
Use two or more people to move and install water heater. Failure to do so can result in back or other injury.
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.
45mm MAX
(1 3/4 in.)
AT LEAST 50mm (2 in.)
GREATER THAN THE DIAMETER
OF THE WATER HEATER.
PIPE TO
ADEQUATE
DRAIN
Figure 1 Drain Pan Installation
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– 6 –
to the area adjacent to the water heater or to lower floors of the structure (see "IMPORTANT" notice on the previous page). Before installing this water heater, consideration and planning must be given to the following details:
Proximity to walls and other objects (see "Clearance
and Accessibility").
Access to gas supply (see "Gas Supply").
Routing and support of the vent piping and termination
(see "Venting").
Position of water supply and placement of water piping
and floor drain (see "Water Supply").
In Earthquake Zones
The water heater must be braced, anchored, or strapped to avoid moving during an earthquake. Contact local utilities for code requirements in your area.
Closet Installation & Floor Surfaces
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. 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 each direction or if in an alcove or closet installation, the entire floor must be covered by the panel.
Clearances and Accessibility
The minimum clearances between the heater and com-
bustible materials are:
Top 200mm (8 in.) Front 100mm (4 in.)
Rear and Sides 25mm (1 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 com­bustible floor.
Figure 2 may be used as a reference guide to locate the specific clearance locations. A minimum of 600mm (24 in.) of front and top clearance and 100mm (4 in.) on each side should be provided for inspection and service.
Gas Supply
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 above the gas control valve. If the information does not agree with the type of gas available, do not install or attempt to start. 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.
FRONT 600mm (24 in.) MIN. FOR SERVICE
BACK
AIR INTAKE *
SENSOR *
SIDES
SIDES
VENT
VENT
TOP TO CEILING
* DO NOT BLOCK AIR INTAKE OR SENSOR ACCESS. ENSURE ADEQUATE
CLEARANCE FOR AIR SUPPLY
Figure 2 Minimum Clearance Locations
DANGER
Explosion Hazard
• Use a 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.
Figure 3 Gas Piping (typical)
DRIP LEG
MANUAL
GAS
SHUT-OFF
GAS
CONTROL/
THERMOSTAT
76mm (3 in.)
GROUND-
JOINT UNION
ALCOVES
CLOSETS
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" CAN/CSA-B149.1 (Canada), or "National Fuel Gas Code" ANSI Z223.1 (NFPA 54) (U.S.A.).
Use properly sized gas piping and to ensure full gas input and a properly sized gas supply regulator to ensure ade­quate gas supply pressure. The supply piping and regulator must be large enough to satisfy the requirements of all appliances connected to the gas service and when all appli­ances are operating simultaneously. Undersize piping and insufficient pressure can restrict the gas flow causing the water heater to perform poorly. Improperly sized piping may pose a safety hazard.
Note: When installing gas piping, apply sealing compounds approved for use with natural and propane gas.
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 drip leg (if not already incorporated as part of the water heater) as shown. The drip 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, or other approved gas dis­connect, between the gas control/thermostat 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 Supply Pressure
Important: The gas supply pressure must not exceed the maximum supply pressure as stated on the water heater's data plate.
Gas line purging
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.
Gas Leak 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 pres­sure 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.
Gas Operating Pressures
The gas supply pressure and burner manifold pressure is listed on the data plate located on the front of the heater above the gas control/thermostat. Ensure the gas supply pressure to the water heater and the burner manifold pres­sure are properly adjusted while all appliances are in oper­ation. Refer to Figure 22 (Robertshaw) or Figure 24 (White­Rodgers) for Gas Control/Thermostat Details.
U.L.and CSA recognized fuel gas and Carbon Monoxide (CO) detectors are recommended in all applications and should be installed using the manufacturer's instructions and local codes, rules or regulations.
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.
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Air Requirements
Important: Air for combustion and ventilation must not come from a corrosive atmosphere. Any failure due to cor­rosive elements in the atmosphere is excluded from war­ranty coverage. Installations in or for certain places including, but not limited to, those listed below may require outdoor air for combus­tion to reduce the risk of chemical exposure:
Beauty shops, Photo processing labs
Buildings with indoor pools
Water heaters installed in laundry, hobby or craft rooms
Water heaters installed near chemical storage areas
In such circumstances, outdoor combustion air may reduce, but will not eliminate the presence of corrosive chemicals in the air. Combustion air must be free of acid-forming chemi­cals such as sulfur, fluorine and chlorine. These elements are found in aerosol sprays, detergents, bleaches, cleaning solvents, air fresheners, paint and varnish removers, refrig­erants and many other commercial and household prod­ucts. When burned, vapours from these products form high­ly corrosive acid compounds. These products should not be stored or used near the water heater or air inlet. The area in which the heater is located is classified as either "an unconfined sp
ace" or "a confined space."
An unconfined space
is defined as a space having a vol­ume not less than 50 cubic feet per 1000 BTU/hour (4.8 cubic metres per kilowatt) of combined input rating of all appliances using the space. Adjacent open rooms may be included as part of the unconfined space, provided there are no closeable doors between these rooms. An exam­ple of this is an open basement. A confined sp
ace is one smaller than described above. For buildings using tight construction (newer and renovated structures), the air supply shall be introduced from the out­doors, regardless of whether the space is confined or unconfined. CHECK LOCAL CODES.
Confined Space Air Requirements for Canadian Installations
Refer to Figure 4 (a), or (b), and Table 1 for proper sizing and location of combustion air ducts and openings. CHECK LOCAL CODES. a). Two permanent openings shall be provided connecting
the confined space (e.g., closet, small room) with the unconfined space. Each opening shall have a free area of one square inch per 1,000 BTU/hour input (22 cm²/kW) of all appliances in the confined space. The top opening shall be located as close to the ceiling as prac­tical but never lower than the top of the heater. (see Figure 4 (a)). The bottom opening shall be located nei­ther more than 450mm (18 in.), nor less than 150mm (6 in.), above floor level.
Note: Ensure sufficient ventilation air to prevent elevat­ed temperatures in closets and confined spaces.
When an exhaust fan is installed in the same room as the water heater, the supply air openings must be of sufficient capacity to prevent a backflow of air through the water heater exhaust venting.
b). When using a single air supply, the duct shall terminate
within 300mm (12 in.) above and within 600mm (24 in.) horizontally of the burner level
of the appliance having the largest input. For example: GSW's water heaters' burners are 150mm (6 in.) from the floor, plus 300mm (12 in.) equals 450mm (18 in.) as shown in Figure 4 (b). All exterior vent openings are to be at least 300mm (12 in.) above the ground and clear of snow levels.
CONFINED
SPACE
PERMANENT OPENINGS
EQUIPMENT LOCATED IN CONFINED SPACES;
ALL AIR FROM INSIDE THE BUILDING.
(a)
UNCONFINED SPACE
BASEMENT INSTALLATION, EQUIPMENT LOCATED IN CONFINED SPACES; ALL AIR FROM OUTDOORS
(b)
CONFINED
SPACE
GRADE
COMBINATION COMBUSTION/
VENTILATION
AIR DUCT
300mm (12 in.) (MIN)
450mm (18 in.)
600mm (24 in.)
Figure 4 Combustion Air Supply Openings And Ducts
(Can.)
BTU / h (kW / hr)
cm2in.2mm in. mm in.
25,000 8 45 7 76 3 100 4 50,000 15 45 7 76 3 100 4 75,000 23 70 11 100 4 125 5 100,000 30 90 14 100 4 125 5 125,000 37 120 18 125 5 150 6 150,000 45 140 22 125 5 150 6
Acceptable Round
Duct Size Diameter
Combine d I nput of
All Appliance s in
Confined Space*
Required
Free Area
A**
B***
Table 1 Air Supply Sizing (Can.)
* All appliances refers to, and includes, those appliances
using the same air source (e.g. water heater, furnace, boiler, clothes dryer etc.).
** Maximum allowable length of ductwork listed in column
A is 6.1 equivalent metres (20 ft.).
*** Maximum allowable length of ductwork listed in column
B is 15.2 equivalent metres (50 ft.).
– 8 –
Confined Space Air Requirements for U.S. Installations
Refer to Figure 5 (a), (b), (c) or (d) for proper sizing and location of combustion air ducts and openings. CHECK
LOCAL CODES.
(a) Equipment located in confined spaces; all air from
inside the building.
Two permanent openings shall be provided connecting the confined space (e.g., closet, small room) with the unconfined space. Each opening shall have a free area of one square inch per 1,000 BTU/hour input (22 cm²/kW) of all appliances in the confined space, but not less than 100 square inches (645 cm²). The top open­ing shall commence within 300mm (12 in.) of the top of space and the bottom opening shall commence within 300mm (12 in.) of the bottom of the enclosure.
(b) Basement installation, equipment located in con-
fined spaces; all air from outdoors.
When supplying air directly from the outdoors, each opening shall have a minimum free area of one square inch per 4,000 BTU/hour input (5.5 cm²/kW) of total input rating of all appliances in the confined space. The inlets shall be a minimum of 300mm (12 in.) above the grade (snow) line. The top opening shall commence within 300mm (12 in.) of the top of the confined space.
(c) Equipment located in confined spaces; all air from
outdoors.
When supplying air directly from the outdoors using hor­izontal ducting, each opening shall have a free mini­mum area of one square inch per 2,000 BTU/hour (11 cm²/kW) of total input rating of all appliances in the con­fined space.
(d) Equipment located in confined spaces; all air from
outdoors through ventilated attic.
When supplying air directly through vertical ducting, each opening shall have a free minimum area of one square inch per 4,000 BTU/hour (5.5 cm²/kW) of total input rating of all appliances in the confined space.
Note: Ensure sufficient ventilation air to prevent elevat­ed temperatures in closets and confined spaces.
When an exhaust fan is installed in the same room as the water heater, the supply air openings must be of sufficient capacity to prevent a backflow of air through the water heater exhaust venting.
CONFINED
SPACE
PERMANENT OPENINGS
EQUIPMENT LOCATED IN CONFINED SPACES;
ALL AIR FROM INSIDE THE BUILDING.
(a)
UNCONFINED SPACE
CONFINED
SPACE
ATTIC LOUVERS TO OUTDOORS
EQUIPMENT LOCATED IN CONFINED SPACES; ALLAIR
FROM OUTDOORS THROUGH VENTILATED ATTIC.
(d)
INLET AIR DUCT
OUTLET
AIR
BASEMENT INSTALLATION, EQUIPMENT LOCATED IN CONFINED SPACES; ALL AIR FROM OUTDOORS
(b)
CONFINED
SPACE
GRADE
300mm
(12 in.)
300mm
(12 in.)
Figure 5 Combustion Air Supply Openings And Ducts
(U.S.A.)
COMBUSTION
AIR DUCT
PERMANENT
VENTILATION
AIR.
300mm
(12 in.)
ABOVE
GRADE
OR
SNOW
LINE
EQUIPMENT LOCATED IN CONFINED
SPACES; ALL AIR FROM OUTDOORS.
(c)
CONFINED
SPACE
COMBUSTION
300mm (12 in.)
300mm (12 in.)
300mm (12 in.)
OUTDOORS
AIR DUCT
VENTILATION
Burn Hazard Do not touch vent. Doing so can result in
burns.
– 9 –
Exhaust Venting
This heater is designed to exhaust the products of combus­tion (flue gases) to the outdoors using a sealed piping sys­tem. Table 2 lists the allowable vent materials and sizing information. Figure 8 shows the general venting layout while Figures 9-12 show various end termination details and clearances. Connection of the venting piping to the blower is shown in Figures 13-15.
Correct installation of the venting system is essential to the safe and efficient operation of this water heater. Vent piping must be installed in accordance with all applicable local and provincial or state codes. In the absence of such codes, all installation shall meet the requirements as stated in the lat­est edition of the "Natural Gas and Propane Installation
Codes" CAN/CSA-B149-1 (Canada) or "National Fuel Gas Code" ANSI Z223.1 (NFPA 54) (U.S.A.).
Note: The information provided in Figure 6 is intended as a
guideline for good vent installation practices only and is not intended to restrict venting options beyond those restric­tions established by the latest edition of the "Natural Gas and Propane Installation Codes" CAN/CSA-B149-1 or any applicable local and provincial codes.
Important Notes and War nings
This heater is certified to be installed using Schedule 40 PVC or CPVC plastic vent material. In Canada some jurisdictions require that this material is approved to ULC S636. ULC S636 mandates that components from different systems must not be mixed in the same vent runs. 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 common vent this heater with any other appli­ance.
During operation the plastic piping will expand as it heats up and contract as it cools down. This is normal for this type of venting. Rigidly fastening the vent piping can cause undue stress that may result in the cracking or fracturing the vent piping material. A fracture of the venting pipe poses a serious safety hazard. To prevent stressing of the vent system, all hangers and supports must allow the vent piping freedom to move.
Use long sweep elbows wherever possible. Closely­coupled elbows and short radius elbows can reduce the venting capacity.
All power vented water heaters generate a certain amount of operational noise. In order to minimize noise transmission to the support structure, use isolation pads between the pipe hangers and the vent pipe.
Most power vent installations develop some condensa­tion in the vent piping. When using long runs of venting or when the venting passes through cold or unheated areas, considerable amounts of condensate from the flue gases can develop. Provision must be made for the condensate to drain freely from the system or to be col­lected in a condensate trap(s) that can be drained. Damage or fracture of the vent piping may occur if the condensate is allowed to collect and freeze. Pooling of condensate can restrict airflow and can cause nuisance failures of the system.
Be aware of any concealed wiring or piping inside the walls.
Ensure sufficient ventilation air to prevent elevated tem­peratures in closets and confined spaces.
– 10 –
VENT LENGTH LESS THAN OR
EQUAL TO 6.1 EQUIVALENT METRES
(20 FT.) USE THIS SCREEN.
VENT LENGTH GREATER THAN 6.1 EQUIVALENT METRES (20 FT.) USE
THIS SCREEN.
Figure 7 Rodent Screens
PREFERRED PRACTICE
150mm
(6 in.) min.
STREET ELBOW NORMAL ELBOW
BACK TO BACK ELBOWS
Figure 6 Pipe Fittings And Practices
90° LONG SWEEP ELBOW
(LESS RESTRICTIVE)
90° SHORT SWEEPELBOW
(MORE RESTRICTIVE)
Venting terminations and sizing
Refer to Figure 8 and Table 2 for vent pipe materials and sizing. Examples of the vent terminations are shown in Figures 9 and 10. If the installation requires a vent riser, suit able drainage must be provided to ensure condensation does not accumulate. Termination through a roof is shown Figure 11.
G/JW 40, 50 and 60-gallon heaters are supplied with a 50mm (2 in.) termination elbow and (2) plastic "rodent screens" (see Figure.7). The screen is required to keep foreign objects, rodents and small birds from entering the venting system and only one (1) screen is to be installed in the termination elbow. These screens have been sized to ensure maximum energy efficiency of the venting system based on the "equivalent length" of the vent piping. How to determine the equivalent length is
shown in Figure 8. The appropriate screen is to be installed into the end of the termination elbow and secured with a small amount of silicone sealant. This will allow for easy removal for inspection and cleaning. For installations using 76mm (3 in.) venting, use the 76mm (3 in.) termination elbow and screen.
G/JW5065 high input models are supplied with a 76mm (3 in.) termination elbow that includes a steel mesh rodent screen.
– 11 –
Example for calculating equivalent feet.
Section “A” . . . . 0.15m . . (0.5 ft.)
90° elbow . . . . . 1.83m . . (6.0 ft.)
Section B . . . . . 0.31m . . (1.0 ft.)
45° elbow . . . . . 0.91m . . (3.0 ft.)
Section C . . . . . 0.46m . . (1.5 ft.)
45° elbow . . . . . 0.91m . . (3.0 ft.)
Section D
. . . . . 4.57m . (15.0 ft.)
Total Equivalent 9.14m . (30.0 ft.) Based on this example use the (fully open) rodent screen for vent length greater than 6.1 equivalent metres (20 equivalent ft.) (see Figure 7).
NOTE: VENT PIPE MUSTBE SUPPORTED EVERY 1.2m (4 ft.). TO PREVENT VIBRATION, USE ISOLATION PADS WHEN ATTACHING STRAPS TO FLOOR JOISTS, WALLS OR CEILINGS.
PVC ADAPTER (SUPPLIED)
STRAP
150mm
(6 in.)
MIN.
45°
ELBOW
90°
ELBOW
RODENT SCREEN
(INSTALLINTO
ELBOW)
Figure 8 General Venting Layout
TERMINATION
ELBOW
GROUND LEVEL OR
MAXIMUM SNOW
LINE*
WATER
HEATER
MODEL
SUFFIX
VENT PIPE
SIZE
PRESSURE
SWITCH
SETTING
* VENT
MATE RIAL
(SCHEDULE 40 )
MAXIMUM EQUIVALENT
V EN T LE NGTH
MINIMUM EQUIVALENT
V EN T LE NGTH
NVH,
PVH
50mm (2 in.)
- 0.15 in. w.c . (-0.037 k Pa)
PVC**, CPVC
15.2m (50 ft.) + term ination elbow
0.76m (2. 5 ft . ) + one 90° elbow + terminat i on el bow
NVH,
PVH
76mm (3 in.)
- 0.15 in. w.c . (-0.037 k Pa)
PVC**, CPVC
24.4m (80 ft.) + term ination elbow
15.2m (50 ft.) + term ination elbow
G/JW5065
SNV,
SPV
76mm (3 in.)
- 0.55 in. w.c .
(-.137 k Pa)
PVC, CPVC
15.2m (50 ft.) + term ination elbow
0.91m (3 ft.) + one 90° elbow + terminat i on el bow
G/JW5065 LNV 76mm (3 i n. )
- 0.50 in. w.c .
(-.124 k Pa)
PVC, CPVC
19.8m (65 ft.) + term ination elbow
6.9m (20 ft.) + t erm ination elbow
G/JW40,
50, 60
Notes:
1. Use long radius elbows where possible. Minimum dis­tance between 90º elbows should be 150mm (6 in.).
2. *Check local codes to determine which materials are allowed in your area.
3. **Pipe assembly adapter must be used with PVC venting material (see Figures 13, 14 & 15).
Table 2 Allowable Vent Lengths and Materials (Vert. and Horiz.).
Equivalent lengths of straight pipe for various elbows using Schedule 40 PVC and CPVC.
Size Type
Short Sweep/
Short Radius
Long Sweep/
Long Radius 50mm (2 in.) 90° elbow 2.44m (8 ft.) 1.52m (5 ft.) 76mm (3 in.) 90° elbow 2.44m (8 ft.) 1.52m (5 ft.) 50mm (2 in.) 45° elbow 0.91m (3 ft.) 0.76m (2.5 ft.) 76mm (3 in.) 45° elbow 1.22m (4 ft.) 1.07m (3.5 ft.)
Venting instructions
1. Plan the venting layout starting at the vent termination and work back toward the heater. Take into considera­tion the style and position of the vent termination, the vent pipe routing, elbows and connectors required and the necessary support hangers.
2. G/JW 40, 50 and 60-gallon heaters may use 50mm (2 in.) or 76mm (3 in.) venting depending on "Equivalent Vent Length" as described in Table 2. G/JW5065 high input models require 76mm (3 in.) venting. See also the section on "Vent pipe connection to blower".
3. Venting should be as direct as possible with the fewest number of fittings. Use long radius 45 degree and long radius 90 degree elbows wherever possible.
4. Do not use 90 degree elbows "back to back" and do not use street elbows. Maintain a minimum 150mm (6 in.) straight section between elbows. Closely coupled and short radius elbows reduce the venting capacity (see Figure 6 and the note below it).
5. DO NOT USE AN ELBOW AS A SUPPORT POINT. Elbows are not designed to carry the weight of the vent­ing system.
6. Calculate "Equivalent Vent Length" before starting. Do not exceed the values shown in Table 2. An example of how this length is determined is shown in Figure 8. The value from your calculations should also be used to determine which rodent screen to install into the vent termination elbow.
7. Measure the vent piping and cut to required lengths. Pipes must be cut at right angles and deburred to ensure a good smooth fit with sufficient overlap for the glue joints. Correct any interference conditions.
8. Provide support hangers for horizontal vent piping every
1.2m (4 ft.) to prevent sagging and stress. Provide a minimum of 3mm (1/8 in.) rise per 1.2m (4 ft.) of vent piping to ensure adequate drainage. Horizontal vent piping must not sag to form valleys where condensate may collect. Vertical venting shall be supported every
1.5m (5 ft.). Use appropriate support straps and vibra­tion isolators (foam pads) on straight sections only. Do not use elbows as support points. Allow sufficient clear­ance for expansion and contraction of the venting sys­tem.
9. At the point where the vent pipe exits the building, cut a 65mm (2-1/2 in.) hole for 50mm (2 in.) venting or a 90mm (3-1/2 in.) hole for 76mm (3 in.) venting.
10. Insert the vent piping through this hole and secure into position. Connect the vent pipe to the end termination elbow as shown in Figures.9-11.
– 12 –
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.
SEALANT
SEALANT
GROUND LEVEL
OR MAXIMUM
SNOW LINE*
Figure 9 Vent Termination Exterior Installation
RODENT SCREEN
(INSTALLINTO
ELBOW)
* WHERE SNOW COVER IS NORMAL DURING WINTER, ENSURE SUFFICIENT VENT CLEARANCE TO PREVENT BLOCKAGE OR ICE BUILDUP.
300mm
(12 in.)
MIN.
ATTACH 90°
TERMINATION
ELBOW
150mm (6 in.)
VENT PIPING MAY BE SLOPED IN ANY DIRECTION, AS LONG AS A WATER TRAP IS NOT CREATED IN THE VENTING SYS­TEM. THE SLOPE SHOULD BE KEPT TO A MINIMUM SO AS NOT TO EXERT ANY UNDUE STRESS ON THE PIPE.
BRACKET
VENT
RISER
SEALANT
SEALANT
ATTACH 90°
TERMINATION
ELBOW
GROUND LEVEL
OR MAXIMUM
SNOW LINE*
Figure 10 Installation Of Fabricated Vent Riser.
RODENT SCREEN (INSTALL
INTO
ELBOW)
VENT PIPING TO BE SLOPED (DOWN) TOWARD HEATER TO PREVENT WATER FROM COLLECTING.
EQUIVALENT
VENT LENGTH
MEASURED FROM
THIS POSITION
* WHERE SNOW COVER IS NORMAL DURING WINTER, ENSURE SUFFICIENT VENT CLEARANCE TO PREVENT BLOCKAGE OR ICE BUILDUP.
300mm
(12 in.)
MIN.
TERMINATION
MAY BE 90°
ELBOW OR A
“T” ELBOW
76mm (3 in.)
MIN. LENGTH
ROOF
LINE
Figure 11 Vertical Venting
A VENT USED IN ASPECIAL VENTING SYSTEM WITH POSITIVE VENT PRESSURE AND PASSING THROUGH A ROOF SHALL EXTEND AT LEAST 450mm (18 in.) ABOVE THE HIGHEST POINT WHERE IT PASSES THROUGH THE ROOF SUR­FACE AND ANY OTHER OBSTRUCTION WITHIN A HORIZONTAL DISTANCE OF 450mm (18 in.). A VERTICAL
VENTING SYSTEM MUST BE SUPPORTED EVERY
1.5m (5 ft.).
RODENT SCREEN
(INSTALL
INTO
ELBOW)
450mm
(18 in.)
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