SWH-I-S Rev D
TM
Installation & Service
Manual
Models: SNR150-100, SNR200-100,
SNA285-125, SNA400-125, AND
SNA500-125
WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death.
--Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
--WHAT TO DO IF YOU SMELL GAS
•Do not try to light any appliance.
•Do not touch any electrical switch; do not use any phone in your building.
•Immediately call your gas supplier from a near by phone. Follow the gas supplier’s instructions.
•If you cannot reach your gas supplier, call the fire department. -- Installation and service must be performed by a qualified
installer, service agency, or the gas supplier.
WARNING This manual must only be used by a qualified heating installer / service technician. Read all instructions in this manual before installing. Perform steps in the order given. Failure to comply could result in severe personal injury, death, or substantial property damage.
Save this manual for future reference.
Contents
PLEASE READ BEFORE PROCEEDING . . . . . . . . . . . 3 Hazard Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
THE SHIELD -- HOW IT WORKS . . . . . . . . . . . . . . . . . 4-6
RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1. DETERMINE WATER HEATER LOCATION
Closet and Alcove Installations . . . . . . . . . . . . . . . . . . . . 8 Provide Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Flooring and Foundation . . . . . . . . . . . . . . . . . . . . . . . . 10 Remove Water Heater from Wood Pallet . . . . . . . . . . . 10 Prevent Combustion Air Contamination . . . . . . . . . . . . 10 Removing Water Heater From Existing Common Vent . 11 Combustion & Ventilation Air Requirements . . . . . . . . . 11
2. GENERAL VENTING
Direct Venting Options . . . . . . . . . . . . . . . . . . . . . . . . . 14 Venting and Combustion Air . . . . . . . . . . . . . . . . . . . . . 15 Requirements for Installation in Canada . . . . . . . . . . . . 15 Air Intake/Vent Connections . . . . . . . . . . . . . . . . . . . . . 16 Vent & Air Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3. SIDEWALL DIRECT VENTING . . . . . . . . . . . . . . . . 18-24 4. VERTICAL DIRECT VENTING . . . . . . . . . . . . . . . . 25-28 5. CONVENTIONAL AND SIDEWALL VENTING . . . . 29
6. SYSTEM PIPING
General Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Scalding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Water Chemistry . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Piping Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Piping Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-34
7. GAS CONNECTIONS
Connecting Gas Supply Piping . . . . . . . . . . . . . . . . . . . 35 Natural Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Pipe Sizing for Natural Gas . . . . . . . . . . . . . . . . . . . 36 Natural Gas Supply Pressure Requirements . . . . . . 36 Propane Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Pipe Sizing for Propane Gas . . . . . . . . . . . . . . . . . . 36 Propane Supply Pressure Requirements . . . . . . . . 36 Check Inlet Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . 37 Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Gas Valve Replacement . . . . . . . . . . . . . . . . . . . . . . . . 38
8. FIELD WIRING
Low Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . 39 Power Cord Connection . . . . . . . . . . . . . . . . . . . . . . . . . 39 Runtime Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Alarm Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9. CONDENSATE DISPOSAL
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
10. START-UP
Check for Gas Leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Inspect/fill Condensate System . . . . . . . . . . . . . . . . . . . . 43 Final Checks Before Starting the Water Heater . . . . . . . 44-46
11. OPERATING INFORMATION
How the Water Heater Operates . . . . . . . . . . . . . . . . . . . 47 Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Protection Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Water Heater Temperature Regulation . . . . . . . . . . . . . . 48 Adjustable Control Parameters . . . . . . . . . . . . . . . . . . . . 48 Saving Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 49 The Shield Control Module . . . . . . . . . . . . . . . . . . . . . . . 50 Status Display Screens . . . . . . . . . . . . . . . . . . . . . . . . . . 51-52
12. MAINTENANCE |
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Maintenance and Annual Startup . . . . . . . . . . . . . . . . . . |
53 |
Address Report Problems . . . . . . . . . . . . . . . . . . . . . |
54 |
Inspect Water Heater Interior . . . . . . . . . . . . . . . . . . . |
54 |
Clean Condensate Trap . . . . . . . . . . . . . . . . . . . . . . . |
54 |
Check All Piping for Leaks . . . . . . . . . . . . . . . . . . . . . |
54 |
Flue Vent System and Air Piping . . . . . . . . . . . . . . . . |
55 |
Check Water System . . . . . . . . . . . . . . . . . . . . . . . . . |
55 |
Check Expansion Tank . . . . . . . . . . . . . . . . . . . . . . . . |
55 |
Check Water Heater Relief Valve . . . . . . . . . . . . . . . |
55 |
Inspect Ignition & Flame Sense Electrodes . . . . . . . . |
56 |
Check Ignition Ground Wiring . . . . . . . . . . . . . . . . . . |
56 |
Check All Water Heating Wiring . . . . . . . . . . . . . . . . . |
56 |
Check Control Settings . . . . . . . . . . . . . . . . . . . . . . . |
56 |
Perform Startup & Checks . . . . . . . . . . . . . . . . . . . . . |
56 |
Check Burner Flames . . . . . . . . . . . . . . . . . . . . . . . . |
56 |
Check Flame Signal . . . . . . . . . . . . . . . . . . . . . . . . . . |
56 |
Review with Owner . . . . . . . . . . . . . . . . . . . . . . . . . . |
56 |
Handling Ceramic Fiber Materials . . . . . . . . . . . . . . . |
57 |
Cleaning Water Heater Heat Exchanger . . . . . . . . . . |
57 |
Oiled Bearing Circulators . . . . . . . . . . . . . . . . . . . . . . |
57 |
13. TROUBLESHOOTING |
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Before Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Troubleshooting Chart - No Display . . . . . . . . . . . . . . 59
Checking Temperature Sensors . . . . . . . . . . . . . . . . . 60
Troubleshooting Chart - Noisy System . . . . . . . . . . . 61
Troubleshooting Chart - Fault Messages Displayed . 62-67
Combustion Analysis Procedure . . . . . . . . . . . . . . . . . . . 68
Gas Valve Adjustment Procedure . . . . . . . . . . . . . . . . . . 69
14. DIAGRAMS
Ladder Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
2
TM
Installation & Service Manual
Please read before proceeding
Hazard definitions
The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or to important information concerning the life of the product.
DANGER
WARNING
CAUTION
CAUTION
NOTICE
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.
CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not avoided, may result in property damage.
NOTICE indicates special instructions on installation, operation, or maintenance that are important but not related to personal injury or property damage.
WARNING Installer – Read all instructions, in this manual before installing. Perform steps in
the order given.
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Have this water heater serviced/inspected by a |
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qualified service technician, at least annually. |
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Failure to comply with the above could result |
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in severe personal injury, death or substantial |
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property damage. |
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When calling or writing about the water |
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NOTICE |
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heater – Please have the water heater model |
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and serial number from the water heater |
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rating plate. |
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Consider piping and installation when |
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determining water heater location. |
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Any claims for damage or shortage in |
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shipment must be filed immediately against |
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the transportation company by the |
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consignee. |
Factory warranty (shipped with unit) does not apply to units improperly installed or improperly operated.
WARNING Failure to adhere to the guidelines on this page can result in severe personal injury,
death, or substantial property damage.
When servicing the water heater –
•To avoid electric shock, disconnect electrical supply before performing maintenance.
•To avoid severe burns, allow the water heater to cool before performing maintenance.
WARNING If the information in these instructions is not followed exactly, a fire or explosion
may result causing property damage, personal injury or death
--Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
--WHAT TO DO IF YOU SMELL GAS
•Do not try to light any appliance.
•Do not touch any electrical switch; do not use any phone in your building.
•Immediately call your gas supplier from a near by phone. Follow the gas supplier’s instructions.
•If you cannot reach your gas supplier, call the fire department.
--Installation and service must be performed by a qualified installer, service agency, or the gas supplier.
Water heater operation –
•Do not block flow of combustion or ventilation air to the water heater.
•Should overheating occur or gas supply fail to shut off, do not turn off or disconnect electrical supply to circulator. Instead, shut off the gas supply at a location external to the appliance.
•Do not use this water heater if any part has been under water. The possible damage to a flooded appliance can be extensive and present numerous safety hazards. Any appliance that has been under water must be replaced.
3
TM
Installation & Service Manual
The Shield - How it works...
1.Access cover - front
Provides access to the gas train and heat exchanger.
2.Air intake adapter
Allows for the connection of the PVC air intake pipe to the water heater.
3.Air pressure switch
The air pressure switch detects blocked inlet conditions.
4.Air shroud (500-125 Model Only_Not Shown)
The air shroud directs air and gas flow into the blower.
5.Blower
The blower pulls in air and gas through the venturi (item 5). Air and gas mix inside the blower and are pushed into the burner, where they burn inside the combustion chamber.
6. Burner (not shown)
Made with metal fiber and |
stainless steel construction, |
the burner uses pre-mixed |
air and gas and provides a |
5 to 1 firing rate. |
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7.Condensate drain connection
Connects the condensate drain line to 1/2" PVC.
8.Electronic Control Module
The electronic control responds to internal and external signals and controls the blower, gas valve, and pumps to meet the demand.
9.Electronic display
The electronic display consists of 7 buttons and a dual line 32character liquid crystal display.
10.Flame inspection window
The quartz glass window provides a view of the burner surface and flame.
11.Flame sensor
Used by the control module to detect the presence of burner flame.
12.Flue gas sensor (not shown)
This sensor monitors the flue gas exit temperature. The control module will modulate and shut down the water heater if the flue gas temperature gets too hot. This protects the flue pipe from overheating.
13.Gas connection pipe
Threaded pipe connection, either 1/2", 3/4", or 1", depending on the model. This pipe should be connected to the incoming gas supply for the purpose of delivering gas to the water heater.
14.Gas shutoff switch (150-100 - - 285-125 Models Only)
An electrical switch designed to cut power from the gas valve to prevent gas flow to the burner.
15.Gas shutoff valve (400-125 -- 500-125 Models Only)
Manual valve used to isolate the gas valve from the gas supply.
16.Gas valve
The gas valve senses the negative pressure created by the blower, allowing gas to flow only if the gas valve is powered and combustion air is flowing.
17.Heat exchanger access cover
Allows access to the combustion side of the heat exchanger coils.
18.Heat exchanger inlet temperature sensor
This sensor monitors the inlet water temperature to the heat exchanger.
19.Heat exchanger outlet temperature sensor
This sensor monitors heat exchanger outlet water temperature.
20.High limit sensor
Device that monitors the outlet water temperature. If the temperature exceeds its setting, it will break the control circuit, shutting the water heater down.
21.Ignition electrode
Provides direct spark for igniting the burner.
22.Line voltage junction box
The junction box contains the connection points for the line voltage power.
23.Low voltage connection board
The connection board is used to connect external low voltage devices.
24.Low voltage wiring connections (knockouts)
Conduit |
entryway |
for |
the |
low |
voltage |
connection board. |
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25.Power cord
Six foot cord allows for quick connection to 120V supply.
26.Pump
Circulates water between the tank and the heat exchanger.
27.Pump relay
Switches power to the pump.
28.Relief valve discharge pipe
Protects the heat exchanger from over pressure and temperature conditions. The relief valve is set at 150 PSI.
29.Stainless steel heat exchanger
Allows water to flow through specially designed coils for maximum heat transfer, while providing protection against flue gas corrosion. The coils are encased in a jacket that contains the combustion process.
30.Tank sensor
Used by the control to monitor the temperature of the tank.
31.Top panel
Removable panel to gain access to the internal components.
32.Vent pipe connection
Allows for the connection of the PVC/CPVC vent pipe system to the water heater.
33.Venturi
The venturi controls air and gas flow into the burner.
34.Water heater drain valve
Location from which the water heater can be drained.
35.Water inlet
Copper sweat connection for cold water supply that returns water from the system to the heat exchanger, either 1-1/2" or 2", depending on the model.
36.Water outlet
Male NPT water connection that supplies hot water to the system, either 1-1/2" or 2", depending on the model.
4
TM
Installation & Service Manual
The Shield - How it works... (continued)
Models SNR150-100 -- SNA285-125
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31 |
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24 |
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1 |
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35 |
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9 |
32 |
28 |
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7 |
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Front View - Models SNR150-100 -- SNA285-125 |
Rear View - Models SNR150-100 -- SNA285-125 |
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30
Left Side (inside unit) -- Models SNR150-100 - |
Right Side (inside unit) -- Models SNR150-100 - SNA285-125 |
SNA285-125 |
5 |
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TM
Installation & Service Manual
The Shield - How it works...
Model SNA400-125 |
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31 |
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Rear View - Model SNA400-125 |
Right Side (inside unit) - Model SNA400-125 |
Model SNA500-125 |
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Rear View - Model SNA500-125 |
Right Side (inside unit) - Model SNA500-125 |
6
TM
Installation & Service Manual
Ratings
Model Number |
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CSA |
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Input Modulation Btu/hr |
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Water Content |
Water |
Gas |
Vent/Air Size |
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Note: Change “N” to |
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Gallons |
Connections |
Connections |
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“L” for L.P. gas models. |
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(Note 2) |
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Min |
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Max |
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(Note 1) |
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SNR150-100 |
30,000 - 150,000 |
92 |
1-1/2" |
1/2" |
3" |
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SNR200-100 |
40,000 - 199,999 |
93 |
1-1/2" |
1/2" |
3" |
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SNA285-125 |
57,000 - 285,000 |
124 |
2" |
3/4" |
4" |
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SNA400-125 |
80,000 - 399,999 |
125 |
2" |
1" |
4" |
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SNA500-125 |
100,000 - 500,000 |
126 |
2" |
1" |
4" |
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NOTICE |
Maximum allowed working pressure is located on the rating plate. |
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Notes:
1. Shield water heaters require special gas venting. Use only the vent materials and methods specified in the Shield Installation and Service Manual.
2. Standard Shield water heaters are equipped to operate from sea level to 4,500 feet only with no adjustments. The water heater will de-rate by 4% for each 1,000 feet above sea level up to 4,500 feet.
3. High altitude Shield water heaters are equipped to operate from 3,000 to 12,000 feet only with no field adjustments. The water heater will de-rate by 2% for each 1,000 feet above 3,000 feet. High altitude models are manufactured with a different control module for altitude operation, but the operation given in this manual remains the same as the standard models. A high altitude label (as shown in FIG. A) is also affixed to the unit.
UNIT EQUIPPED FOR
HIGH ALTITUDE
3,000 FT. TO 12,000 FT.
Figure A High Altitude Label Location
7
TM
Installation & Service Manual
1Determine water heater location
Installation must comply with:
•Local, state, provincial, and national codes, laws, regulations, and ordinances.
•National Fuel Gas Code, ANSI Z223.1 – latest edition.
•National Electrical Code.
•For Canada only: B149.1 Installation Code, CSA C22.1 Canadian Electrical Code Part 1 and any local codes.
NOTICE |
The Shield water heater gas manifold and |
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controls met safe lighting and other |
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performance under tests specified in |
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ANSI Z21.10.3 – latest edition. |
Before locating the water heater, check:
1.Check for nearby connection to:
•Water piping
•Venting connections
•Gas supply piping
•Electrical power
2.Locate the appliance so that if water connections should leak, water damage will not occur. When such locations cannot be avoided, it is recommended that a suitable drain pan, adequately drained, be installed under the appliance. Under no circumstances is the manufacturer to be held responsible for water damage in connection with this appliance, or any of its components.
3.Check area around the water heater. Remove any combustible materials, gasoline and other flammable liquids.
Failure to keep water heater area clear andWARNING free of combustible materials, gasoline, and other flammable liquids and vapors can result in severe personal injury, death,
or substantial property damage.
4.The Shield water heater must be installed so that gas control system components are protected from dripping or spraying water or rain during operation or service.
8
WARNING This appliance is certified as an indoor appliance. Do not install the appliance
outdoors or locate where the appliance will be exposed to freezing temperatures or to temperatures that exceed 100°F.
Failure to install the appliance indoors could result in severe personal injury, death, or substantial property damage.
This appliance requires a special ventingWARNING system. The vent connection to the
appliance must be made with the CPVC pipe section installed in the appliance. The field provided vent fittings must be cemented to the CPVC pipe section. Use only the vent materials, primer and cement specified in this manual to make the vent connections. Failure to follow this warning could result in fire, personal injury, or death.
Closet and alcove installations
A closet is any room the water heater is installed in which is less than 455 cubic feet for SNR150-100 and SNR200-100 models and 671 cubic feet for the SNA285-125 through SNA500-125 models.
An alcove is any room which meets the criteria for a closet with the exception that it does not have a door.
Example: Room dimensions = 6 feet long, 6 feet wide, and 9 foot ceiling = 6 x 6 x 9 = 324 cubic feet. This would be considered a closet for a Shield Water Heater.
WARNING |
For closet and alcove installations as |
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shown in FIG.’s 1-1 and 1-2, CPVC vent |
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material must be used inside the structure. |
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The ventilating air openings shown in |
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FIG.’s 1-1 and 1-2 are required for this |
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arrangement. Failure to follow this |
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warning could result in fire, personal |
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injury, or death. |
Provide clearances:
Clearances from combustible materials
1.Hot water pipes—at least 1" from combustible materials.
2.Vent pipe – at least 1" from combustible materials.
3.See FIG.’s 1-1 and 1-2 on page 9 for other clearance minimums.
Clearances for service access
1.See FIG.’s 1-1 and 1-2 on page 9 for recommended service clearances. If you do not provide the minimum clearances shown, it may not be possible to service the water heater without removing it from the space.
TM
Installation & Service Manual
1Determine water heater location (continued)
Figure 1-1 Closet Installation - Minimum Required Clearances
1" MINIMUM CLEARANCE AROUND HOT WATER PIPES AND VENT PIPE
RECOMMENDED SERVICE
CLEARANCES:
Top - |
18" (457 mm) |
Right Side - |
24" (610 mm) |
Front - |
24" (610 mm) |
WARNING
6"
For closet installations, CPVC material MUST BE used in a closet structure due to elevated temperatures. Failure to follow this warning could result in fire, personal injury, or death.
VENTILATING
AIR OPENING
CLOSED DOOR
VENTILATING
AIR OPENING
6"
*AREA OF EACH OPENING:
1 SQ. INCH PER 1000 BTU PER HOUR INPUT WITH A MINIMUM OF 100 SQ. INCHES
Figure 1-2 Alcove Installation - Minimum Required Clearances
1" MINIMUM CLEARANCE AROUND HOT WATER PIPES AND VENT PIPE
RECOMMENDED SERVICE CLEARANCES:
Top - |
18" (457 mm) |
Right Side - |
24" (610 mm) |
Front - |
24" (610 mm) |
WARNING For alcove installations, CPVC material MUST BE used in an
alcove structure due to elevated temperatures. Failure to follow this warning could result in fire, personal injury, or death.
OPEN
FRONT
9
TM
Installation & Service Manual
1Determine water heater location
Flooring and foundation
Flooring
The Shield water heater is approved for installation on combustible flooring, but must never be installed on carpeting.
WARNING Do not install the water heater on carpeting even if foundation is used. Fire can result,
causing severe personal injury, death, or substantial property damage.
When local codes require compliance with NSF 5, the heater must be sealed to the floor with a food grade silicone to prevent debris and harborage of vermin under the heater.
If flooding is possible, elevate the water heater sufficiently to prevent water from reaching the water heater.
Remove water heater from wood pallet
1.Remove the sides and the top of the crate.
2.Remove the blocks on the base of the crate to allow for easier removal.
3.The water heater can then be slid off the base of the crate for installation.
NOTICE
Do not drop the water heater or bump the jacket on the floor or pallet. Damage to the water heater can result.
Prevent combustion air contamination
Install air inlet piping for the Shield water heater as described in this manual. Do not terminate vent/air in locations that can allow contamination of combustion air. Refer to Table 1A, for products and areas which may cause contaminated combustion air.
WARNING Ensure that the combustion air will not contain any of the contaminants in Table 1A.
Contaminated combustion air will damage the water heater, resulting in possible severe personal injury, death or substantial property damage. Do not pipe combustion air near a swimming pool, for example. Also, avoid areas subject to exhaust fumes from laundry facilities. These areas will always contain contaminants.
Table 1A Corrosive Contaminants and Sources
Products to avoid:
Spray cans containing chloro/fluorocarbons
Permanent wave solutions
Chlorinated waxes/cleaners
Chlorine-based swimming pool chemicals
Calcium chloride used for thawing
Sodium chloride used for water softening
Refrigerant leaks
Paint or varnish removers
Hydrochloric acid/muriatic acid
Cements and glues
Antistatic fabric softeners used in clothes dryers
Chlorine-type bleaches, detergents, and cleaning solvents found in household laundry rooms
Adhesives used to fasten building products and other similar products
Areas likely to have contaminants
Dry cleaning/laundry areas and establishments
Swimming pools
Metal fabrication plants
Beauty shops
Refrigeration repair shops
Photo processing plants
Auto body shops
Plastic manufacturing plants
Furniture refinishing areas and establishments
New building construction
Remodeling areas
Garages with workshops
10
TM
Installation & Service Manual
1Determine water heater location (continued)
When removing a water heater from existing common vent system:
DANGER |
Do not install the Shield water heater into |
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a common vent with any other appliance. |
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This will cause flue gas spillage or |
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appliance malfunction, resulting in |
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possible severe personal injury, death, or |
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substantial property damage. |
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Failure to follow all instructions can result |
WARNING |
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in flue gas spillage and carbon monoxide |
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emissions, causing severe personal injury |
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or death. |
At the time of removal of an existing water heater, the following steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while the other appliances remaining connected to the common venting system are not in operation.
a.Seal any unused openings in the common venting system.
b.Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or restriction, leakage, corrosion, or other deficiencies, which could cause an unsafe condition.
c.Test vent system – Insofar as is practical, close all building doors and windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dryers and any appliance not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.
d.Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so appliance will operate continuously.
e.Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle, or smoke from a cigarette, cigar, or pipe.
f.After it has been determined that each appliance remaining connected to the common venting system properly vents when tested as outlined herein, return doors, windows, exhaust fans, fireplace dampers, and any other gas-burning appliance to their previous conditions of use.
g.Any improper operation of the common venting system should be corrected so the installation conforms with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural Gas and Propane Installation Code. When resizing any portion of the common venting system, the common venting system should be resized to approach the minimum size as determined using the appropriate tables in Part 11 of the National Fuel Gas Code, ANSI Z223.1/NFPA and/or CAN/CSA B149.1, Natural Gas and Propane Installation Code.
Maintain minimum specified clearances for adequate operation. All installations must allow sufficient space for servicing the vent connections, water pipe connections, piping and other auxiliary equipment, as well as the appliance. The clearance labels on each appliance note the same service and combustible clearance requirements as shown above.
Multiple appliances may be installed in a modular water heater installation. Multiple appliances may be installed side by side with no clearance between adjacent appliances because this appliance is approved for zero clearance from combustible surfaces.
Consult the Venting section of this manual for specific installation instructions for the appropriate type of venting system that you will be using.
Combustion and ventilation air requirements for appliances drawing air from the equipment room
Provisions for combustion and ventilation air must be in accordance with Air for Combustion and Ventilation, of the latest edition of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CGA Standard B149 Installation Code for Gas Burning Appliances and Equipment, or applicable provisions of the local building codes.
The equipment room MUST be provided with properly sized openings to assure adequate combustion air and proper ventilation.
11
TM
Installation & Service Manual
1Determine water heater location
Figure 1-3_Combustion Air Direct from Outside
1.If air is taken directly from outside the building with no duct, provide two permanent openings to the equipment room (see FIG. 1-3):
(a)Combustion air opening, with a minimum free area of one square inch per 4000 Btu/hr input (5.5 cm2 per kW). This opening must be located within 12" (30 cm) of the bottom of the enclosure.
(b)Ventilation air opening, with a minimum free area of one square inch per 4000 Btu/hr input
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(5.5 cm2 per kW). |
This opening must |
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Figure 1-4_Combustion Air Through Ducts
12
2.If combustion and ventilation air is taken from the outdoors using a duct to deliver the air to the equipment room, each of the two openings should be sized based on a minimum free area of one square inch per 2000 Btu/hr (11 cm2 per kW) of input (see FIG. 1-4).
IF NECESSARY FOR
TIGHT CONSTRUCTION
Figure 1-5_Combustion Air from Interior Space
3.If air is taken from another interior space, each of the
two openings specified above should have a net free area of one square inch for each 1000 Btu/hr (22 cm2 per kW) of input, but not less than 100 square inches (645 cm2) (see FIG. 1-5).
Figure 1-6_Combustion Air from Outside - Single Opening
4.If a single combustion air opening is provided to bring combustion air in directly from the outdoors, the opening must be sized based on a minimum free area of one square inch per 3000 Btu/hr (7 cm2 per kW). This opening must be located within 12" (30 cm) of the top of the enclosure (see FIG. 1-6).
TM
Installation & Service Manual
1Determine water heater location (continued)
TABLE - 1B
MINIMUM RECOMMENDED COMBUSTION
AIR SUPPLY TO EQUIPMENT ROOM
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FIG. 1-3 |
FIG. 1-4 |
FIG. 1-5 |
FIG. 1-6 |
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Model |
*Outside Air from |
*Outside Air from |
**Inside Air from |
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2 Openings Directly from |
2 Ducts Delivered from |
2 Ducts Delivered from Interior |
*Outside Air from |
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Number |
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Outdoors |
Outdoors |
Space |
1 Opening Directly |
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Top |
Bottom |
Top |
Bottom |
Top |
Bottom |
from Outdoors, in2 |
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Opening, in2 |
Opening, in2 |
Opening, in2 |
Opening, in2 |
Opening, in2 |
Opening, in2 |
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SNR150-100 |
38 |
38 |
75 |
75 |
150 |
150 |
50 |
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(246 cm2) |
(246 cm2) |
(484 cm2) |
(484 cm2) |
(968 cm2) |
(968 cm2) |
(323 cm2) |
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SNR200-100 |
50 |
50 |
100 |
100 |
200 |
200 |
67 |
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(323 cm2) |
(323 cm2) |
(646 cm2) |
(646 cm2) |
(1,291 cm2) |
(1,291 cm2) |
(433 cm2) |
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SNA285-125 |
72 |
72 |
143 |
143 |
285 |
285 |
95 |
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(465 cm2) |
(465 cm2) |
(923 cm2) |
(923 cm2) |
(1,839 cm2) |
(1,839 cm2) |
(613 cm2) |
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SNA400-125 |
100 |
100 |
200 |
200 |
400 |
400 |
134 |
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(646 cm2) |
(646 cm2) |
(1,291 cm2) |
(1,291 cm2) |
(2,581 cm2) |
(2,581 cm2) |
(865 cm2) |
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SNA500-125 |
125 |
125 |
250 |
250 |
500 |
500 |
167 |
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(807 cm2) |
(807 cm2) |
(1,613 cm2) |
(1,613 cm2) |
(3,226 cm2) |
(3,226 cm2) |
(1,078 cm2) |
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*Outside air openings shall directly communicate with the outdoors. When combustion air is drawn from the outside through a duct, the net free area of each of the two openings must have twice (2 times) the free area required for Outside Air/2 Openings. The above requirements are for the water heater only; additional gas fired appliances in the equipment room will require an increase in the net free area to supply adequate combustion air for all appliances.
**Combined interior space must be 50 cubic feet per 1,000 Btu/hr input. Buildings MUST NOT be of *“Tight Construction”. For buildings of *“Tight Construction”, provide air openings into the building from outside.
*No combustion air openings are needed when the water heater is installed in a space with a volume NO LESS than 50 cubic feet per 1,000 Btu/hr of all installed gas fired appliances. Buildings MUST NOT be of *“Tight Construction”.
*”Tight Construction” is defined as a building with less than 0.40 ACH (air changes per hour).
Combustion air requirements are based on the latest edition of the National Fuel Gas Code, ANSI Z223.1; in Canada refer to the latest edition of CGA Standard CAN B149.1. Check all local code requirements for combustion air.
All dimensions based on net free area in square inches. Metal louvers or screens reduce the free area of a combustion air opening a minimum of approximately 25%. Check with louver manufacturers for exact net free area of louvers. Where two openings are provided, one must be within 12" (30cm) of the ceiling and one must be within 12" (30cm) of the floor of the equipment room. Each opening must have net free area as specified in the chart above (Table 1B). Single openings shall commence within 12" (30cm) of the ceiling.
CAUTION |
Under no circumstances should the |
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equipment room ever be under negative |
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pressure. Particular care should be taken |
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where exhaust fans, attic fans, clothes dryers, |
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compressors, air handling units, etc., may |
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take away air from the unit. |
The combustion air supply must be completely free of any flammable vapors that may ignite or chemical fumes which may be corrosive to the appliance. Common corrosive chemical fumes which must be avoided are fluorocarbons and other halogenated compounds, most commonly present as refrigerants or solvents, such as Freon, trichlorethylene, perchlorethylene, chlorine, etc. These chemicals, when burned, form acids which quickly attack the stainless steel heat exchanger, headers, flue collectors, and the vent system.
The result is improper combustion and a non-warrantable, premature appliance failure.
EXHAUST FANS: Any fan or equipment which exhausts air from the equipment room may deplete the combustion air supply and/or cause a downdraft in the venting system. Spillage of flue products from the venting system into an occupied living space can cause a very hazardous condition that must be immediately corrected. If a fan is used to supply combustion air to the equipment room, the installer must make sure that it does not cause drafts which could lead to nuisance operational problems with the appliance.
13
TM
Installation & Service Manual
2General venting
Direct venting options
Figure 2-1 Vertical Direct Venting (Two-Pipe Vertical Termination) - See page 25 for more details
Figure 2-2 Sidewall Direct Venting (Two-Pipe Sidewall Termination) - See page 18 for more details
Figure 2-3 Concentric Vertical Termination - See page 27 for more details
Figure 2-4 Concentric Sidewall Termination - See page 22 for more details
14
TM
Installation & Service Manual
2General venting (continued)
Venting and combustion air
The Shield water heater must be vented andDANGER supplied with combustion and ventilation air as described in this section. Ensure the vent and air piping and the combustion air supply comply with these instructions regarding vent system, air system, and combustion air quality. See also Section 1 of
this manual.
Inspect finished vent and air piping thoroughly to ensure all are airtight and comply with the instructions provided and with all requirements of applicable codes.
Failure to provide a properly installed vent and air system will cause severe personal injury or death.
Vent piping materials
WARNING
NOTICE
Use only the materials listed in Table 2A below for vent pipe, and fittings. Failure to comply could result in severe personal injury, death, or substantial property damage.
Installation must comply with local requirements and with the National Fuel Gas Code, ANSI Z223.1 for U.S. installations or CSA B149.1 for Canadian installations.
WARNING For closet and alcove installations, CPVC material MUST BE used in a closet/alcove
structure. Failure to follow this warning could result in fire, personal injury, or death.
Table 2A Vent Pipe and Fittings
NOTICE |
All vent pipes must be glued, properly |
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supported, and the exhaust must be pitched |
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a minimum of a 1/4 inch per foot back to the |
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water heater (to allow drainage of |
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condensate). |
WARNING This appliance requires a special venting system. The vent connection to the appliance must be made with the CPVC pipe section installed in the appliance. The field provided vent fittings must be cemented to the CPVC pipe section. Use only the vent materials, primer and cement specified in this manual to make the vent connections. Failure to follow this warning could result in fire, personal injury, or death.
Requirements for installation in Canada
1.Installations must be made with a vent pipe system certified to ULC-S636.
IPEX is an approved vent manufacturer in Canada supplying vent material listed to ULC-S636.
2.The first three (3) feet of plastic vent pipe from the appliance flue outlet must be readily accessible for visual inspection.
3.The components of the certified vent system must not be interchanged with other vent systems or unlisted pipe/fittings. For concentric vent installations, the inner vent tube must be replaced with field supplied certified vent material to comply with this requirement.
4.The 3" Concentric Vent Kit available from Lochinvar (see Section 3 – Sidewall Termination – Optional Concentric Vent) and the 3" Concentric Vent Kit available from IPEX are both approved for use on the Shield Water Heater. Both kits are listed to the ULC-S636 standard for use in Canada.
All vent pipe materials and fittings must comply with the following:
Item |
Material |
Standards for installation in: |
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United States |
Canada |
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PVC schedule 40 |
ANSI/ASTM D1785 |
CPVC and PVC venting must be |
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ULC-S636 Certified. IPEX is an |
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Vent pipe and fittings |
PVC-DWV |
ANSI/ASTM D2665 |
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approved manufacturer in Canada |
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supplying vent material listed to |
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CPVC schedule 40 |
ANSI/ASTM F441 |
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ULC-S636. |
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PVC |
ANSI/ASTM D2564 |
IPEX System 636 |
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Pipe cement/primer |
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Cements & Primers |
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CPVC |
ANSI/ASTM F493 |
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NOTICE: DO NOT USE CELLULAR (FOAM) CORE PIPE
15
TM
Installation & Service Manual
2General venting
Air intake/vent connections
1.Combustion Air Intake Connector (FIG.’s 2-5 and 2-6) - Used to provide combustion air directly to the unit from outdoors. A fitting is provided on the unit for final connection. Combustion air piping must be supported per guidelines listed in the National Mechanical Code,
Section 305, Table 305.4 or as local codes dictate.
2.Vent Connector (FIG.’s 2-5 and 2-6) - Used to provide a passageway for conveying combustion gases to the outside. A transition fitting is provided on the unit for final connection. Vent piping must be supported per the National Building Code, Section 305, Table 305.4 or as local codes dictate.
Figure 2-5 Near Water Heater Venting Models
SNR150-100 - SNR200-100
Figure 2-6 Near Water Heater Venting Models
SNA285-125 - SNA500-125
AIR
VENT
4" CPVC PIPE INSTALLED IN THE WATER HEATER MUST BE USED FOR VENT CONNECTION
AIR
VENT
3" CPVC PIPE INSTALLED IN THE WATER HEATER MUST BE USED FOR VENT CONNECTION
NOTE: CPVC VENT PIPE AND VENT FITTINGS MUST BE USED IN CLOSET AND ALCOVE INSTALLATIONS.
NOTE: CPVC VENT PIPE AND VENT FITTINGS MUST BE USED IN CLOSET AND ALCOVE INSTALLATIONS.
Air inlet pipe materials:
The air inlet pipe(s) must be sealed. Choose acceptable combustion air inlet pipe materials from the following list:
PVC, CPVC or ABS
Dryer Vent or Sealed Flexible Duct (not recommended for rooftop air inlet)
Galvanized steel vent pipe with joints and seams sealed as specified in this section.
Type “B” double-wall vent with joints and seams sealed as specified in this section.
*Plastic pipe may require an adapter (not provided) to transition between the air inlet connection on the appliance and the plastic air inlet pipe.
The Shield water heater uses model specific combustion air intake and vent piping sizes as detailed in Table 2B below.
Table 2B Air Intake/Vent Piping Sizes
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Model |
Air Intake |
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Vent |
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SNR150-100 -- SNR200-100 |
3 inches |
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3 inches |
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SNA285-125 -- SNA500-125 |
4 inches |
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4 inches |
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Increasing or decreasing combustion air or |
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NOTICE |
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vent piping is not authorized. |
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Models SNA400-125 and SNA500-125 will de-rate 1.75% per 25 feet of vent when installed as direct vent or 0.75% per 25 feet of vent when drawing combustion air from the room.
Models SNR150-100 through SNA285-125 will de-rate up to 1% per 25 feet of vent pipe when installed as direct vent, but will not de-rate when drawing combustion air from the room.
16
TM
Installation & Service Manual
2General venting (continued)
Minimum / Maximum allowable combustion air and vent piping lengths are as follows:
Vent = 12 equivalent feet minimum / 100 equivalent feet maximum
Combustion Air (when used) = 12 equivalent feet minimum / 100 equivalent feet maximum
When determining equivalent combustion air and vent length, add 5 feet for each 90° elbow and 3 feet for each 45° elbow.
EXAMPLE: 20 feet of PVC pipe + (4) 90° elbows + (2) 45° elbows + (1) concentric vent kit (CVK3003) = 49 equivalent feet of piping.
Table 2C Equivalent Vent Lengths
Model |
Kit |
Equivalent |
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Number |
Vent Length |
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SNR150-100 -- SNR200-100 |
CVK3003 |
3 feet |
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SNA285-125 |
CVK3007 |
3 feet |
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SNA400-125 |
CVK3007 |
5 feet |
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SNA500-125 |
CVK3007 |
30 feet |
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Removing from existing vent
Follow the instructions in Section 1, page 11 of this manual when removing a water heater from an existing vent system.
Vent and air piping
Vent and air system:
NOTICE
Installation must comply with local requirements and with the National Fuel Gas Code, ANSI Z223.1 for U.S. installations or CSA B149.1 for Canadian installations.
You may use any of the vent/air piping methods covered in this manual. Do not attempt to install the Shield water heater using any other means.
WARNING DO NOT mix components from different systems. The vent system could fail, causing
leakage of flue products into the living space. Use only PVC or CPVC and fittings, with primer and cement specifically designed for the material used.
Vent, air piping and termination:
The Shield water heater vent and air piping can be installed through the roof or through a sidewall. Follow the procedures in this manual for the method chosen. Refer to the information in this manual to determine acceptable vent and air piping length.
Air contamination
Pool and laundry products and common household and hobby products often contain fluorine or chlorine compounds. When these chemicals pass through the water heater, they can form strong acids. The acid can eat through the water heater wall, causing serious damage and presenting a possible threat of flue gas spillage or appliance water leakage into the building.
Please read the information given in Table 1A, page 10, listing contaminants and areas likely to contain them. If contaminating chemicals will be present near the location of the water heater combustion air inlet, have your installer pipe the water heater combustion air and vent to another location, per this manual.
WARNING
WARNING
If the water heater combustion air inlet is located in a laundry room or pool facility, for example, these areas will always contain hazardous contaminants.
To prevent the potential of severe personal injury or death, check for areas and products listed in Table 1A, page 10 before installing the water heater or air inlet piping.
If contaminants are found, you MUST:
• Remove contaminants permanently. —OR—
•Relocate air inlet and vent terminations to other areas.
17
3Sidewall direct venting
Vent/air termination – sidewall
WARNING
WARNING
Follow instructions below when determining vent location to avoid possibility of severe personal injury, death, or substantial property damage.
A gas vent extending through an exterior wall shall not terminate adjacent to a wall or below building extensions such as eaves, parapets, balconies, or decks. Failure to comply could result in severe personal injury, death, or substantial property damage.
WARNING
NOTICE
Do not connect any other appliance to the vent pipe or multiple water heaters to a common vent pipe. Failure to comply could result in severe personal injury, death, or substantial property damage.
Installation must comply with local requirements and with the National Fuel Gas Code, ANSI Z223.1 for U.S. installations or CSA B149.1 for Canadian installations.
Determine location
Locate the vent/air terminations using the following guidelines:
1.The total length of piping for vent or air must not exceed the limits given in the General Venting Section on page 17 of this manual.
2.You must consider the surroundings when terminating the vent and air:
a.Position the vent termination where vapors will not damage nearby shrubs, plants or air conditioning equipment or be objectionable.
b.The flue products will form a noticeable plume as they condense in cold air. Avoid areas where the plume could obstruct window views.
c.Prevailing winds could cause freezing of condensate and water/ice buildup where flue products impinge on building surfaces or plants.
d.Avoid possibility of accidental contact of flue products with people or pets.
e.Do not locate the terminations where wind eddies could affect performance or cause recirculation, such as inside building corners, near adjacent buildings or surfaces, window wells, stairwells, alcoves, courtyards, or other recessed areas.
WARNING Sidewall vent and air inlet terminations must terminate in the same pressure
zone.
18
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TM |
Installation & Service Manual |
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f.Do not terminate above any door or window. Condensate can freeze, causing ice formations.
g.Locate or guard vent to prevent condensate damage to exterior finishes.
Figure 3-1A Sidewall Termination of Air and Vent
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TO BOILER |
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INTAKE AIR |
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CONNECTION |
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FROM BOILER |
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VENT PIPE |
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CONNECTION |
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POSSIBLE ORIENTATIONS |
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12" |
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MIN |
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TO |
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OVER- |
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HANG |
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VENT / AIR |
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TERMINATION |
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GRADE OR |
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Table 3A Sidewall Vent Kits |
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Model |
Kit Number |
Vent Size |
SNR150-100 -- SNR200-100 KIT30045 |
3 inch vent |
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SNA285-125 -- SNA500-125 |
KIT30046 |
4 inch vent |
If using the alternate sidewall termination:
3.The air piping must terminate in a down-turned elbow as shown in FIG. 3-1B. This arrangement avoids recirculation of flue products into the combustion air stream.
4.The vent piping must terminate in an elbow pointed outward or away from the air inlet, as shown in FIG. 3-1B.
WARNING Do not exceed the maximum lengths of the
outside vent piping shown in FIG. 3-1B. Excessive length exposed to the outside could cause freezing of condensate in the vent pipe, resulting in potential water heater shutdown.
Figure 3-1B Alternate Sidewall Termination of Air and Vent w/Field Supplied Fittings
TM
Installation & Service Manual
3Sidewall direct venting (continued)
Vent/air termination – sidewall
Figure 3-1C Alternate Venting Arrangement (if Space Allows) w/Field Supplied Fittings
TO BOILER
INTAKE AIR COUPLING
CONNECTION
12” MIN
15” MAX
FROM BOILER
VENT PIPE
CONNECTION
BIRD SCREEN
12” MIN
BIRD
SCREEN
ALTERNATE VENTING ARRANGEMENT
(IF SPACE PERMITS)
5.Maintain clearances as shown in FIG.’s 3-1A thru 3-3B, pages 18 and 19. Also maintain the following:
a.Vent must terminate:
•At least 6 feet from adjacent walls.
•No closer than 12 inches below roof overhang.
•At least 7 feet above any public walkway.
•At least 3 feet above any forced air intake within 10 feet.
•No closer than 12 inches below or horizontally from any door or window or any other gravity air inlet.
b.Air inlet must terminate at least 12 inches above grade or snow line; at least 12 inches below the vent termination; and the vent pipe must not extend more than 24 inches vertically outside the building.
c.Do not terminate closer than 4 feet horizontally from any electric meter, gas meter, regulator, relief valve, or other equipment. Never terminate above or below any of these within 4 feet horizontally.
6.Locate terminations so they are not likely to be damaged by foreign objects, such as stones or balls, or subject to buildup of leaves or sediment.
Figure 3-2 Clearance to Gravity Air Inlets
12"
MIN.
VENT / AIR
TERMINATION
12" MIN.
12" MIN.
Figure 3-2B Alternate Clearance to Gravity Air Inlets w/Field Supplied Fittings
Figure 3-3A Clearance to Forced Air Inlets
IF LESS
THAN 10’
VENT / AIR
TERMINATION 36"
MIN.
FORCED AIR
INLET
7' MIN. ABOVE ANY PUBLIC WALKWAY
Figure 3-3B Alternate Clearance to Forced Air Inlets w/Field Supplied Fittings
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3Sidewall direct venting
Prepare wall penetrations
1.Use the factory supplied wall plate as a template to locate the vent and air intake holes and mounting holes.
Air pipe penetration:
a.Cut a hole for the air pipe. Size the air pipe hole as close as desired to the air pipe outside diameter.
Vent pipe penetration:
a.Cut a hole for the vent pipe. For either combustible or noncombustible construction, size the vent pipe hole with at least a 1/2 inch clearance around the vent pipe outer diameter:
•4½ inch hole for 3 inch vent pipe
•5½ inch hole for 4 inch vent pipe
Drill 3/16" diameter holes for inserting the plastic anchors into the wall.
2.Install the vent and air intake piping through the wall into the vent plate openings. Seal all gaps between the pipes and wall. Use RTV silicone sealant to seal the air pipe. Use the glue (cement/primer) listed in Table 2A on page 15 to seal the vent pipe.
Prepare wall penetrations (Alternate - Field Supplied Option)
1.Air pipe penetration:
a.Cut a hole for the air pipe. Size the air pipe hole as close as desired to the air pipe outside diameter.
2.Vent pipe penetration:
a.Cut a hole for the vent pipe. For either combustible or noncombustible construction, size the vent pipe hole with at least a 1/2 inch clearance around the vent pipe outer diameter:
•4½ inch hole for 3 inch vent pipe
•5½ inch hole for 4 inch vent pipe
b.Insert a galvanized metal thimble in the vent pipe hole as shown in FIG. 3-4B.
3.Use a sidewall termination plate as a template for correct location of hole centers.
4.Follow all local codes for isolation of vent pipe when passing through floors or walls.
5.Seal exterior openings thoroughly with exterior caulk.
3.Mount and secure the vent plate to the wall using Figure 3-4B Alternate Sidewall Termination Assembly
stainless steel screws. Seal around the plate to the wall w/Field Supplied Fittings assuring no air gaps.
4.Assemble the vent cap to the vent plate (see FIG. 3-4A). Insert the stainless steel screws into the vent cap screw hole openings and securely attach the vent cap to the vent plate.
5.Seal all wall cavities.
Figure 3-4A Sidewall Termination Assembly
|
AIR PIPING |
VENT PIPING |
|
|
VENT PLATE |
WALL PLATE |
VENT CAP |
|
|
GALVANIZED |
|
THIMBLE |
|
Termination and fittings
1.The air termination coupling must be oriented at least 12 inches above grade or snow line as shown in FIG. 3-1A, page 18.
2.Maintain the required dimensions of the finished termination piping as shown in FIG. 3-1A, page 18.
3.If using the alternate sidewall termination do not extend exposed vent pipe outside of the building more than what is shown in this document. Condensate could freeze and block vent pipe.
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Installation & Service Manual
3Sidewall direct venting (continued)
Vent/air termination – sidewall
Figure 3-5A Multiple Vent Terminations (must also comply with Figure 3-1A)
12" MIN. BETWEEN EDGE OF AIR INLET AND ADJACENT VENT OUTLET
VENT
Figure 3-5B Alternate Multiple Vent Terminations w/Field Supplied Fittings (must also comply with Figure 3-1B)
AIR
VENT / AIR
TERMINATION
Multiple vent/air terminations
1.When terminating multiple Shield water heaters terminate each vent/air connection as described in this manual (FIG. 3-5A).
WARNING All vent pipes and air inlets must terminate at the same height to avoid possibility of
severe personal injury, death, or substantial property damage.
2.Place wall penetrations to obtain minimum clearance of 12 inches between edge of air inlet and adjacent vent outlet, as shown in FIG. 3-5A for U.S. installations. For Canadian installations, provide clearances required by CSA B149.1 Installation Code.
3.The air inlet of a Shield water heater is part of a direct vent connection. It is not classified as a forced air intake with regard to spacing from adjacent water heater vents.
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3Sidewall direct venting
Sidewall termination – optional concentric vent
Description and usage
Lochinvar offers optional concentric combustion air and vent pipe termination kits (Factory Kit #CVK3003 for 3" diameter - Models SNR150-100 - SNR200-100 and #CVK3007 for 4" diameter - Models SNA285-125 - SNA500-125). Both combustion air and vent pipes must attach to the termination kit. The termination kits must terminate outside the structure and must be installed as shown in FIG. 3-6.
The required combustion vent pipe materials are listed in Table 2A, on page 15 of this manual.
Sidewall termination installation
1.Determine the best location for the termination kit (see FIG. 3-6).
2.The total length of piping for vent or air must not exceed the limits given in the General Venting section on page 17 of this manual.
3.You must consider the surroundings when terminating the vent and air:
a.Position the vent termination where vapors will not damage nearby shrubs, plants or air conditioning equipment or be objectionable.
b.The flue products will form a noticeable plume as they condense in cold air. Avoid areas where the plume could obstruct window views.
c.Prevailing winds could cause freezing of condensate and water/ice buildup where flue products impinge on building surfaces or plants.
d.Avoid possibility of accidental contact of flue products with people or pets.
f.Do not terminate above any door or window. Condensate can freeze, causing ice formations.
g.Locate or guard vent to prevent condensate damage to exterior finishes.
Figure 3-6 Concentric Sidewall Termination
4.Cut one (1) hole (5 inch diameter for #CVK3003 installations or 7 inch diameter for #CVK3007 installations) into the structure to install the termination kit.
5.Partially assemble the concentric vent termination kit. Clean and cement using the procedures found in these instructions.
a.Cement the Y concentric fitting to the larger kit pipe (FIG.’s 3-7 and 3-8).
b.Cement the rain cap to the smaller diameter kit pipe (FIG.’s 3-7 and 3-8).
Figure 3-7 Kit Contents_CVK3003 - SNR150-100 -- |
Figure 3-8 Kit Contents_CVK3007 - SNA285-125 -- |
SNR200-100 |
SNA500-125 |
|
RAIN CAP |
|
6" (152 MM) TO 4" (102 MM) REDUCER |
|
6" (152 MM) DIA. |
|
6" (152 MM) DIA. |
|
4" (102 MM) DIA. |
|
"Y" CONCENTRIC |
|
FITTING |
|
6" (152 MM) DIA. |
|
"FLEXIBLE" PIPE |
22 |
COUPLING |
|