A.O. Smith BTH 120 - 250 User Manual
CYCLONE XHE® Model BTH 120 - 250
COMMERCIAL GAS WATER HEATER
GAS-FIRED POWER BURNER
FOR DOMESTIC HOT WATER
INSTALLATION OPERATION SERVICE MAINTENANCE LIMITED WARRANTY
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 neighbor's 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.
Thank you for buying this energy efficient water heater from
A.O. Smith Water Products Company. We appreciate your
confidence in our products.
CAUTION
TEXT PRINTED OR OUTLINED IN RED CONTAINS
INFORMATION RELATIVE TO YOUR SAFETY. PLEASE
READ THOROUGHLY BEFORE INSTALLING AND USING
THIS APPLIANCE.
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND
NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
PRINTED IN U.S.A. 2570 1199 Part No. 194119-000
1
A DIVISION OF A.O. SMITH CORPORATION
Mc BEE, SOUTH CAROLINA
Supersedes P/Ns. 192968-000/193329-000/193311-000
ROUGH-IN -DIMENSIONS CYCLONE XHE BTH 120 - 250
Table 1. RECOVERY CAPACITIES - NATURAL GAS / L.P.
Model BTU Approx.
Input Gallon
Capacity 30 40 50 60 70 80 90 100 110 120 130 140
BTH - 120 125,000 Nat. 60 475 356 285 237 203 178 158 142 129 119 110 102
BTH - 120 120,000 L.P. 60 456 342 274 228 195 171 152 137 124 114 105 98
BTH - 150 150,000 Nat. 100 570 427 342 285 244 214 190 171 155 142 132 122
BTH - 150 150,000 L.P. 100 570 427 342 285 244 214 190 171 155 142 132 122
BTH - 199 199,900 Nat. 100 759 569 456 380 325 285 253 228 207 190 175 163
BTH - 199 199,900 L.P. 100 759 569 456 380 325 285 253 228 207 190 175 163
BTH - 250 240,000 Nat. 100 912 684 547 456 391 342 304 274 248 228 210 195
Recovery capacities are based on heater performance at 94% thermal efficiency.
TEMPERATURE RISE - DEGREES °F - GALLONS PER HOUR
2
FOREWORD
These designs comply with the latest version of the American National
Standard for Gas Water Heaters, Volume III, ANSI Z21.10.3 as an automatic
circulating tank water heater, and automatic storage water heaters.
Detailed installation diagrams are found in this manual. These diagrams will
serve to provide the installer with a reference for the materials and methods
of piping necessary. It is highly essential that all water, gas piping and
wiring be installed as shown on the diagrams.
Particular attention should be given to the installation of thermometers at
the locations indicated on the diagrams as these are necessary for checking
the proper functioning of the heater.
TABLE OF CONTENTS
PAGE
ROUGH-IN DIMENSIONS ................................................................... 2
FOREWORD ....................................................................................... 3
FEATURES ........................................................................................... 4
Water Temperature Control ............................................................. 4
High Limit Switch (E.C.O.) .............................................................. 4
Dishwashing Machine Requirement ................................................ 5
Circulating Pump ............................................................................. 5
INSTALLATION INSTRUCTIONS ......................................................... 5
Required Ability ............................................................................... 5
Insulation Blankets .......................................................................... 5
Locating The Heater ........................................................................ 5
Clearances ...................................................................................... 6
Hard Water ...................................................................................... 6
Air Requirements ............................................................................ 6
Mechanical Exhausting of Room Air ............................................... 6
Unconfined Space .......................................................................... 6
Confined Space .............................................................................. 6
Chemical Vapor Corrosion .............................................................. 6
VENTING ............................................................................................. 6
Vent Pipe Termination ..................................................................... 6
Direct Venting ................................................................................. 8
Direct Vent Terminal Installation (Sidewall) ..................................... 8
Installation Sequence ...................................................................... 9
Vertical Vent Terminal Installation ................................................... 10
Installation Sequence ...................................................................... 10
Installation of Vent System ............................................................ 10 -11
Vent Pipe Preparation ..................................................................... 11
CONTROLS AND SWITCHES ............................................................. 11-12
Blower Prover Switch ...................................................................... 11
Blocked Outlet Prover Switch .............................................................. 12
Blocked Inlet Prover Switch ............................................................ 12
Low Gas Pressure Switch ............................................................... 12
On/Off Switch ................................................................................. 12
Hot Surface Igniter ......................................................................... 12
GAS PIPING ........................................................................................ 12
Connection of Gas Pipe .................................................................. 13
Purging ............................................................................................ 13
Gas Meter Size - City Gases Only ................................................. 13
Gas Pressure Regulation ................................................................ 13
Gas Valves...................................................................................... 13
SYSTEM CONNECTIONS ................................................................... 13
Thermometers ................................................................................. 13
Relief Valve .................................................................................... 13
In addition to these instructions, the equipment shall be installed in
accordance with those installation regulations in force in the local area
where the installation is to be made. These shall be carefully followed in all
cases. Authorities having jurisdiction should be consulted before
installations are made.
In the absence of local codes, the installation must comply with the latest
editions of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and the
National Electric Code, NFPA 70. The former is available from the
Canadian Standards Association, 8501 East Pleasant Valley Road,
Cleveland, OH 44131, and both documents are available from the National
Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02269.
PAGE
Water Line Connections .................................................................. 14
Heater Wiring .................................................................................. 14
OPERATION ......................................................................................... 15
Sequence of Operation ................................................................... 15
Self Diagnostic Controller ............................................................... 15
Gas Value LEDs Flashing ............................................................... 15
Error Codes ..................................................................................... 16
Fault Conditions .............................................................................. 16
No Incoming Line Voltage ............................................................... 16
No Low Voltage ............................................................................... 16
Temperature Probe Fault ................................................................. 16
E.C.O. Switch Open ........................................................................ 17
Control Bad ..................................................................................... 17
Combustion Air Blockage ................................................................ 17
PRIOR TO START-UP .......................................................................... 18
Required Ability ............................................................................... 18
OPERATIING INSTRUCTIONS ............................................................. 18
Adjustment Procedure (Initial Start-Up) ........................................... 18
Lighting Instructions ........................................................................ 19
Cathodic Protection ......................................................................... 20
Precautions ...................................................................................... 20
GENERAL INFORMATION .................................................................... 20
Power Burner ................................................................................... 20
High Limit ........................................................................................ 20
High Altitude Installations ................................................................ 20
MAINTENANCE ..................................................................................... 20
General ............................................................................................ 20
Maintenance Schedule ..................................................................... 20
Flushing ........................................................................................... 21
Draining ........................................................................................... 21
Sediment Removal .......................................................................... 21
Lime Scale Removal ....................................................................... 21
Anode Inspection and Replacement ................................................ 21-22
Drain Valve and Access Panels ...................................................... 22
Relief Valve ..................................................................................... 22
Circulating Pump ............................................................................. 22
Vent System ................................................................................... 22
INSTALLATION DIAGRAMS ................................................................... 23 - 27
Manifold Kits .................................................................................... 28
CHECKLIST AND SERVICE INFORMATION ....................................... 29
TROUBLE-SHOOTING .......................................................................... 29-30
REPLACEMENT PARTS ......................................................................... 30
LIMITED WARRANTY ......................................................................... 31
3
FEATURES
IMPORTANT
IT IS REQUIRED THAT A QUALIFIED SERVICE TECHNICIAN PERFORM THE
INITIAL FIRING OF THE HEATER. AT THIS TIME THE USER SHOULD NOT
HESITATE TO ASK THE TECHNICIAN ANY QUESTIONS WHICH HE MAY
HAVE IN REGARD TO THE OPERATION AND MAINTENANCE OF THE UNIT.
A CHECKLIST AND SERVICE INFORMATION section are included at the rear
of this manual. By using this checklist the user may be able to make minor
operational adjustments and save himself unnecessary service calls.
However, the user should not attempt repairs which are not listed in this
section.
WATER TEMPERATURE CONTROL
Temperature Time to Produce 2nd & 3rd
Setting Degree Burns on Adult Skin
180°F Nearly instantaneous
170°F Nearly instantaneous
160°F About 1/2 second
150°F About 1-1/2 seconds
140°F Less than 5 seconds
130°F About 30 seconds
120°F More than 5 minutes
FIGURE 1
Valves for reducing point-of-use temperature by mixing cold and hot water
are available (see Figure 2). Also available are inexpensive devices that
attach to faucets to limit hot water temperatures. Contact a licensed plumber
or the local plumbing authority.
DANGER
THIS WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE THERMOSTAT
TO CONTROL WATER TEMPERATURE. HOT WATER TEMPERATURES
REQUIRED FOR AUTOMATIC DISHWASHER AND LAUNDRY USE CAN
CAUSE SCALD BURNS RESULTING IN SERIOUS PERSONAL INJURY AND/
OR DEATH. THE TEMPERATURE AT WHICH INJURY OCCURS VARIES WITH
THE PERSONS AGE AND TIME OF EXPOSURE. THE SLOWER RESPONSE
TIME OF DISABLED PERSONS INCREASES THE HAZARDS TO THEM. NEVER
ALLOW SMALL CHILDREN TO USE A HOT WATER TAP, OR TO DRAW
THEIR OWN BATH WATER. NEVER LEAVE A CHILD OR DISABLED PERSON
UNATTENDED IN A BATHTUB OR SHOWER.
THE WATER HEATER SHOULD BE LOCATED IN AN AREA WHERE THE
GENERAL PUBLIC DOES NOT HAVE ACCESS TO SET TEMPERATURES.
The water temperature is controlled using the Temperature Control Button
on the Display at the front of the unit (See Figure 1). This control utilizes
two temperature probes to determine the tank temperature. The primary
temperature probe is located at the top of the tank and the other is near the
water inlet.
The temperature may be adjusted from 80° to 180°F. The thermostat was
adjusted to 120°F before the heater was shipped from the factory. It is
recommended that lower water temperatures be used to avoid the risk of
scalding. It is further recommended, in all cases, that the water temperature
be set for the lowest temperature which satisfies your hot water needs.
This will also provide the most energy efficient operation of the water
heater and minimize scale formation.
SETTING THE WATER HEATER TEMPERATURE AT 120°F WILL REDUCE THE
RISK OF SCALDS. Some states require settings at specific lower
temperatures.
Figure 1 shows the approximate time-to-burn relationship for normal adult
skin. Short repeated heating cycles caused by small hot water uses can
cause temperatures at the point of use to exceed the thermostat setting by
up to 20°F. If you experience this type of use, you should consider using
lower temperature settings to reduce scald hazards.
FIGURE 2
HIGH LIMIT SWITCH (E.C.O.)
The top immersion well of the dual bulb controller also contains the high limit
(energy cutoff) sensor. The high limit switch interrupts the main burner
gas flow should the water temperature reach approximately 202°F.
Should the high limit switch activate, it must be manually reset by depressing
the Temperature Adjustment Button/Reset Button on the display board. The
water temperature must drop below 160°F before the controller can be
reset.
Continued manual resetting of high limit control, preceded by higher than
usual water temperature is evidence of high limit switch operation. The
following are possible reasons for high limit switch operation.
A malfunction in the thermostatic controls would allow the gas valve to
remain open causing water temperature to exceed the thermostat setting.
The water temperature would continue to rise until high limit switch
operation.
Contact your dealer or servicer if continued high limit switch operation
occurs.
4
DISHWASHING MACHINE REQUIREMENT
LOCATING THE HEATER
All dishwashing machines meeting the National Sanitation Foundation
requirements are designed to operate with water flow pressures between
15 and 25 pounds per square inch. Flow pressures above 25 pounds per
square inch, or below 15 pounds per square inch, will result in improperly
sanitized dishes. Where pressures are high, a water pressure reducing
or flow regulating control valve should be used in the 180°F line to the
dishwashing machine, and should be adjusted to deliver water between
these limits.
The National Sanitation Foundation also recommends circulation of 180°F
water. Where this is done, the circulation should be very gentle so that it
does not cause any unnecessary turbulence inside the water heater. The
circulation should be just enough to provide 180°F water at the point of
take-off to the dishwashing machine. Adjust flow by means of the plug
cock in the circulating line. (See installation diagrams.)
CIRCULATING PUMP
A circulating pump is used when a system requires a circulating loop or
there is a storage tank used in conjunction with the heater. Refer to the
piping diagrams at rear of manual for electrical hookup information and
install in accordance with the latest version of the National Electric Code
ANSI/NFPA No. 70.
Only all bronze circulators are used with commercial water heaters.
Although circulators are oiled and operated by the manufacturer some
circulators must be oiled again before operated. Please refer to
manufacturer's instructions.
INSTALLATION INSTRUCTIONS
WARNING
THERE IS A RISK IN USING FUEL BURNING APPLIANCES SUCH AS GAS
WATER HEATERS IN ROOMS, GARAGES OR OTHER AREAS WHERE
GASOLINE, OTHER FLAMMABLE LIQUIDS OR ENGINE DRIVEN EQUIPMENT
OR VEHICLES ARE STORED, OPERATED OR REPAIRED. FLAMMABLE
VAPORS ARE HEAVY AND TRAVEL ALONG THE FLOOR AND MAY BE
IGNITED BY THE HEATERS IGNITER OR MAIN BURNER FLAMES CAUSING
FIRE OR EXPLOSION. SOME LOCAL CODES PERMIT OPERATION OF GAS
APPLIANCES IF INSTALLED 18 INCHES OR MORE ABOVE THE FLOOR.
THIS MAY REDUCE THE RISK IF LOCATION IN SUCH AN AREA CANNOT BE
AVOIDED.
THE HEATER SHALL BE LOCATED OR PROTECTED SO IT IS NOT SUBJECT
TO PHYSICAL DAMAGE BY A MOVING VEHICLE.
DO NOT LOCATE THE HEATER WHERE NOISE FROM THE EXHAUST OR
INTAKE WILL BE OBJECTIONABLE. THIS INCLUDES LOCATIONS CLOSE TO
OR ACROSS FROM WINDOWS AND DOORS. AVOID ANCHORING THE
VENT AND INTAKE PIPES DIRECTLY TO FRAMED WALLS, FLOORS OF
CEILINGS UNLESS RUBBER ISOLATION PIPE HANGERS ARE USED. THIS
PREVENTS ANY VIBRATIONS FROM BEING TRANSMITTED INTO THE LIVING
SPACES.
WARNING
FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY OTHER
POTENTIAL FIRE HAZARDOUS ARTICLES MUST NEVER BE PLACED ON
OR ADJACENT TO THE HEATER. OPEN CONTAINERS OF FLAMMABLE
MATERIAL SHOULD NOT BE STORED OR USED IN THE SAME ROOM WITH
THE HEATER.
When installing the heater, consideration must be given to proper location.
Location selected should be as close to the intake and exhaust termination
points as practicable, with adequate air supply and as centralized with the
piping system as possible.
REQUIRED ABILITY
INSTALLATION OR SERVICE OF THIS WATER HEATER REQUIRES ABILITY
EQUIVALENT TO THAT OF A LICENSED TRADESMAN IN THE FIELD
INVOLVED. PLUMBING, AIR SUPPLY, VENTING, GAS SUPPLY AND
ELECTRICAL WORK ARE REQUIRED.
INSULATION BLANKETS
Insulation blankets available to the general public for external use on gas
water heaters are not approved for use on your A.O. Smith water heater.
The purpose of an insulation blanket is to reduce the standby heat loss
encountered with storage tank water heaters. Your A.O. Smith water
heater meets or exceeds the ASHRAE/IES 90.1b 1992 standards with
respect to insulation and standby loss requirements, making an insulation
blanket unnecessary.
WARNING
Should you choose to apply an insulation blanket to this heater, you should
follow these instructions. Failure to follow these instructions can result in
fire, asphyxiation, serious personal injury or death.
Do not apply insulation to the top, or the upper 15" of the water heater,
as this will interfere with safe operation.
Do not cover the temperature & pressure relief valve.
THE HEATER MUST NOT BE LOCATED IN AN AREA WHERE IT WILL BE
SUBJECT TO FREEZING.
LOCATE IT NEAR A FLOOR DRAIN. THE HEATER SHOULD BE LOCATED IN
AN AREA WHERE LEAKAGE FROM THE HEATER OR CONNECTIONS WILL
NOT RESULT IN DAMAGE TO THE ADJACENT AREA OR TO LOWER FLOORS
OF THE STRUCTURE.
When such locations cannot be avoided, it is recommended that a suitable
drain pan, adequately drained, be installed under the appliance.
WARNING
THIS WATER HEATER IS A CONDENSING UNIT AND REQUIRES A DRAIN TO
BE LOCATED IN CLOSE PROXIMITY TO ALLOW THE CONDENSATE TO
DRAIN SAFELY. THE CONDENSATE DRAINS FROM THE UNIT AT THE
EXHAUST ELBOW LOCATED AT THE BOTTOM OF THE UNIT. NOTE: IT IS
IMPORTANT THAT THE CONDENSATE HOSE NOT BE ELEVATED ABOVE
THE EXHAUST ELBOW (SEE FIGURE 3). THE CONDENSATE BUILD-UP WILL
BLOCK THE EXHAUST OUTLET, WHICH WILL CAUSE IMPROPER
OPERATION.
Do not cover the instruction manual. Keep it on the side of the water
heater or nearby for future reference.
Do obtain new labels from A.O. Smith for placement on the blanket
directly over the existing labels.
FIGURE 3
5
WARNING
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDER WATER.
IMMEDIATELY CALL A QUALIFIED SERVICE TECHNICIAN TO INSPECT THE
APPLIANCE AND TO REPLACE ANY PART OF THE CONTROL SYSTEM
AND ANY GAS CONTROL WHICH HAS BEEN UNDER WATER.
CLEARANCES
These heaters are approved for installation on combustible flooring in an
alcove when the minimum clearances from any combustion construction
are followed as indicated in Figure 4.
UNCONFINED SPACE
In buildings of conventional frame, brick or stone construction, unconfined
spaces may provide adequate air for combustion and ventilation.
If the unconfined space is within a building of tight construction (buildings
using the following construction: weather stripping, heavy insulation,
caulking, vapor barrier, etc.), air for combustion and ventilation must be
obtained from outdoors. The installation instructions for confined spaces
in tightly constructed buildings must be followed to ensure adequate air
supply.
CONFINED SPACE
In all installations the minimum combustible clearances from any vent piping
shall be 0". Vent piping passing through a combustible wall or ceiling must
be a continuous run (no joints).
A service clearance of 24" should be maintained from serviceable parts
such as relief valves, flue baffles, flue damper devices, thermostats,
cleanout openings or drain valves.
Always disconnect electrical power before servicing the unit
FIGURE 4
*ILLUSTRATION OF MINIMUM COMBUSTIBLE CLEARANCES IN AN
ALCOVE
HARD WATER
Where hard water conditions exist, water softening or the threshold type
of water treatment is recommended. This will protect the dishwashers,
coffee urns, water heaters, water piping and other equipment.
See MAINTENANCE section for details of tank cleanout procedure.
AIR REQUIREMENTS
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE MATERIALS,
GASOLINE AND OTHER FLAMMABLE VAPORS AND LIQUIDS.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILATING AIR.
WARNING
FOR SAFE OPERATION PROVIDE ADEQUATE AIR FOR COMBUSTION AND
VENTILATION. AN INSUFFICIENT SUPPLY OF AIR WILL CAUSE
RECIRCULATION OF COMBUSTION PRODUCTS RESULTING IN
CONTAMINATION THAT MAY BE HAZARDOUS TO LIFE. SUCH A CONDITION
OFTEN WILL RESULT IN A YELLOW, LUMINOUS BURNER FLAME, CAUSING
CARBONING OR SOOTING OF THE COMBUSTION CHAMBER, BURNERS
AND FLUE TUBES AND CREATES A RISK OF ASPHYXIATION.
When drawing combustion air from inside a conventionally constructed
building to a confined space, such a space shall be provided with two
permanent openings, ONE IN OR WITHIN 12 INCHES OF THE ENCLOSURE
TOP AND ONE IN OR WITHIN 12 INCHES OF THE ENCLOSURE BOTTOM.
Each opening shall have a free area of at least one square inch per 1000
Btuh of the total input of all appliances in the enclosure, but not less than
100 square inches.
If the confined space is within a building of tight construction, air for
combustion and ventilation must be obtained from outdoors. When directly
communicating with the outdoors through vertical ducts, two permanent
openings, located in the above manner, shall be provided. Each opening
shall have a free area of not less than one square inch per 4000 Btuh of the
total input of all appliances in the enclosure. If horizontal ducts are used,
each opening shall have a free area of not less than one square inch per
2000 Btuh of the total input of all appliances in the enclosure.
CHEMICAL VAPOR CORROSION
WARNING
CORROSION OF THE FLUE WAYS AND VENT SYSTEM MAY OCCUR IF AIR
FOR COMBUSTION CONTAINS CERTAIN CHEMICAL VAPORS. SUCH
CORROSION MAY RESULT IN FAILURE AND RISK OF ASPHYXIATION.
Spray can propellants, cleaning solvents, refrigerator and air conditioning
refrigerants, swimming pool chemicals, calcium and sodium chloride, waxes,
and process chemicals are typical compounds which are potentially
corrosive.
PRODUCTS OF THIS SORT SHOULD NOT BE STORED NEAR THE HEATER.
ALSO, AIR WHICH IS BROUGHT IN CONTACT WITH THE HEATER SHOULD
NOT CONTAIN ANY OF THESE CHEMICALS. IF NECESSARY,
UNCONTAMINATED AIR SHOULD BE OBTAINED FROM REMOTE OR OUTSIDE
SOURCES.
VENTING
WARNING
THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST BE FOLLOWED
TO AVOID CHOKED COMBUSTION OR RECIRCULATION OF FLUE GASES.
SUCH CONDITIONS CAUSE SOOTING OR RISKS OF FIRE AND
ASPHYXIATION.
Heater must be protected from freezing downdrafts during shutdown periods.
WARNING
NEVER OPERATE THE HEATER UNLESS IT IS VENTED TO THE OUTDOORS
AND HAS ADEQUATE AIR SUPPLY TO AVOID RISKS OF IMPROPER
OPERATION, FIRE, EXPLOSION OR ASPHYXIATION.
VENT PIPE TERMINATION
NOTE: Before installing venting, determine place of vent pipe termination.
See Figure 6 before proceeding.
MECHANICAL EXHAUSTING OF ROOM AIR
Where an exhaust fan is installed in the same room with a heater, sufficient
openings for air must be provided in the walls. UNDERSIZED OPENINGS
WILL CAUSE AIR TO BE DRAWN INTO THE ROOM THROUGH THE HEATERS
VENTING SYSTEM, CAUSING POOR COMBUSTION. SOOTING MAY RESULT
IN SERIOUS DAMAGE TO THE HEATER AND RISK OF FIRE OR EXPLOSION.
IT CAN ALSO CREATE A RISK OF ASPHYXIATION.
DO NOT TERMINATE THE VENTING WHERE NOISE FROM THE EXHAUST OR
CAUTION
INTAKE WILL BE OBJECTIONABLE. THIS INCLUDES LOCATIONS CLOSE TO
OR ACROSS FROM WINDOWS AND DOORS. AVOID ANCHORING THE
VENT AND INTAKE PIPES DIRECTLY TO FRAMED WALLS, FLOORS OR
CEILINGS UNLESS RUBBER ISOLATION PIPE HANGERS ARE USED. THIS
PREVENTS ANY VIBRATIONS FROM BEING TRANSMITTED INTO THE LIVING
SPACES.
6
DIRECT VENT
DO NOT TERMINATE EXHAUST
OVER PUBLIC AREA WHERE
CONDENSATE OR VAPOR CAN
CAUSE NUISANCE OR HAZARD.
FIGURE 5
HORIZONTAL VENT
*NOTE: BTH 250 USES TEE ON
AIR INTAKE TERMINAL
EXHAUST VENT HOOD MUST BE
LOCATED 1' MINIMUM FROM ANY
OPENING IN BUILDING.
FIGURE 6
7
IMPORTANT
The vent system must terminate so that proper clearances are maintained
as cited in local codes or the latest edition of the National Fuel Gas Code,
ANSI Z223.1,7.3.4e and 7.8a,b, as follows:
1. Do not terminate the exhaust vent terminal over public area where
condensate or vapor can cause nuisance or hazard.
2. For direct vent, the venting system shall terminate at least 1 foot below,
1 foot horizontally from or 1 foot above any door, window, or gravity air
inlet into building.
3. For horizontal the venting system shall terminate 4 foot below, 4 foot
horizontally from or 1 foot above any door, window, or gravity air inlet
into building.
4. The manufacturer also recommends the vent system terminations not
be installed closer than 3 feet from an inside corner of an L shaped
structure. And not less than 1 foot above grade or anticipated snow
level.
5. The vent termination shall not be mounted directly above or within 3 feet
horizontally from an oil tank vent or gas meter to avoid potential freeze-
up from condensation.
6. The vent shall terminate a minimum of 12" above expected snowfall
level to prevent blockage of vent termination.
Plan the vent system layout so that proper clearances are maintained from
plumbing and wiring.
Vent pipes serving power vented appliances are classified by building
codes as "vent connectors". Required clearances from combustible
materials must be provided in accordance with information in this manual
under LOCATION OF HEATER and CLEARANCES, and with National Fuel
Gas Code and local Codes.
IMPORTANT
Plan the layout of the vent system backwards from the vent termination to
the appliance.
WARNING
USE ONLY THE VENT TERMINALS SUPPLIED WITH THIS UNIT. TERMINATION
OF A VENT SYSTEM WITH A DEVICE OTHER THAN THE SUPPLIED VENT
TERMINATIONS WILL AFFECT SYSTEM PERFORMANCE AND RESULT IN A
SAFETY HAZARD.
FIGURE 8
DIRECT VENT TERMINAL INSTALLATION
IMPORTANT
THIS UNIT CONSISTS OF TWO VENT TERMINALS - AN INTAKE VENT
TERMINAL AND AN EXHAUST VENT TERMINAL. THE INTAKE VENT
TERMINAL IS A 3" 45°PVC ELBOW (OR 3" PVC TEE FOR BTH 250) WITH A
MESH WIRE SCREEN AND THE EXHAUST VENT TERMINAL IS A 3" 45°PVC
ELBOW WITH A MESH WIRE SCREEN.
BTH 120
BTH 150
& 199
DIRECT VENTING
The air intake provided on the unit contains a mesh screen (see Figure 7)
to prevent large particles from entering the unit.
3" 45° PVC ELBOW WITH MESH SCREEN
FIGURE 7
WARNING
WHEN THE UNIT IS TO BE SETUP AS A DIRECT VENT, THE MESH SCREEN
MUST BE REMOVED. THE INLET VENT PIPE MAY THEN BE GLUED TO THE
AIR INTAKE (see Figure 8) PROVIDED ON THE UNIT.
BTH 250
FIGURE 9
8
IMPORTANT
WHEN LOCATING THE TERMINALS ON A SIDEWALL, THE FOLLOWING
SPECIFICATIONS PERTAINING TO TERMINAL LOCATION MUST BE
FOLLOWED.
1. The intake vent terminal and the exhaust vent terminal must terminate on
the same exterior wall and must be located at a minimum of 24" (inches)
from the vertical centerline of the exhaust vent terminal (see Figure 9).
In colder climates increasing the 24" minimum will reduce possibility of
frost over from side winds blowing exhaust vapors to the air intake of
the direct the vent.
2. The horizontal centerline of the intake vent terminal may not be located
lower than the horizontal centerline of the exhaust vent terminal
(see Figure 9).
INSTALLATION SEQUENCE
For installations in the City of Los Angeles, California Category IV PVC Pipe
such as that manufactured by Brownline Pipe Company, must be used as
vent pipe material
CAUTION
Vent terminals supplied with the heater must be used.
NOTE: BEFORE BEGINNING INSTALLATION OF ANY VENT PIPE READ THE
VENT PIPE MANUFACTURER'S INSTALLATION INSTRUCTIONS.
1. After the points of termination have been determined, use the cover
plates as templates to mark the holes for the vent pipes to be inserted
through the wall. BEWARE OF CONCEALED WIRING AND PIPING INSIDE
OF WALL.
2. If the vent terminals are being installed on the outside of a finished wall,
it may be easier to mark both the inside and outside wall. Align the holes
by drilling a hole through the center of the template from the inside
through to the outside. The template can now be positioned on the
outside wall using the drilled holes as a centering point for the template.
3. A) MASONRY SIDE WALLS
Chisel an opening approximately one half inch larger than the marked
circle.
B) WOODEN SIDE WALLS
Drill a pilot hole approximately one quarter inch outside of the marked
circle. This pilot hole is used as a starting point for a saws-all or sabre
saw blade. Cut around the marked circle staying approximately one
quarter inch outside of the line. (This will allow the vent pipe to easily
slide through the opening. The resulting gap will be covered by the vent
terminal cover plates.) Repeat this step on the inside wall if necessary.
4. Cut a length of 3 inch PVC pipe about 3.5 inches longer than the wall
thickness at the opening.
5. Glue the intake vent terminal to the section of the pipe.
6. Slide the wall plate over the pipe to stop against intake vent terminal.
7. Place a bead of caulking (not supplied) around the gap between the
pipe and the wall. Place some of the caulking on the back of the plate to
hold it against the wall after installation.
8. If the vent pipe is installed up to the wall, with a coupling on the end
against the wall opening, the pipe with the vent terminal can be prepared
for gluing before inserting through the wall. Slide the pipe through the
wall and insert into coupling on the other side of the wall, making sure
that the vent terminal ends up pointed in the correct position (Figure 10).
FIGURE 10
9
FIGURE 11
VERTICAL VENT TERMINAL INSTALLATION
IMPORT ANT
WHEN TERMINATING THROUGH A ROOF, THE FOLLOWING
SPECIFICATIONS PERTAINING TO TERMINAL LOCATION MUST BE
FOLLOWED.
1. Proper support must be provided for all pipe protruding through the
roof.
2. The vertical roof terminations should be sealed with a plumbing roof
boot or equivalent flashing.
3. The intake vent termination and the exhaust vent termination must
penetrate the same side of roof.
4. The center line of the intake vent termination and the center line of the
exhaust vent termination must be no closer than 24" (inches).
5. The intake vent terminal and the exhaust vent terminal must be oriented
facing downward and the same direction.
The specifications are displayed in Figure 11 & 12.
NOTE: Exhaust vent terminal is installed using the same procedure.
INST ALLA TION SEQUENCE
NOTE: BEFORE BEGINNING INSTALLATION OF ANY VENT PIPE, READ
“VENT PIPE PREPARATION” SECTION ON PAGE 11.
1. After the points of termination have been determined, use the cover
plates as templates to mark the holes for the vent pipes to be inserted
through the roof.
2. Drill a pilot hole approximately one quarter inch outside of the marked
circle. This pilot hole is used as a star ting point for a saws-all or sabre
saw blade. Cut around the marked circle staying approximately one
quarter inch outside the line. (This will allow the vent pipe to easily slide
through the opening). The resulting gap will be covered by the roof boot/
flashing.
3. Suspend the pipe through the center of the hole using proper support.
4. Slide roof boot or equivalent flashing over pipe and secure roof boot
equivalent flashing to roof.
5. Seal around flashing.
6. Terminate intake terminal and exhaust vent terminal facing down as
shown in Figure 12.
FIGURE 12
INSTALLATION OF VENT SYSTEM
WARNING
THE OPTIONAL INTAKE VENTING ARRANGEMENT AND THE EXHAUST
VENTING ARRANGEMENT MUST BE INSTALLED TO RUN DIRECTLY TO THE
OUTDOORS AND NOT IN ANY WAY BE CONNECTED TO ANOTHER
VENTING SYSTEM (I.E. FURNACE, DRYERS OR SPACE HEATERS). IT IS
CRUCIAL THAT THE VENTING ARRANGEMENT BE KEPT SEPARATE FROM
OTHER VENTING SYSTEMS. IF THIS WARNING IS IGNORED, AND THE
SYSTEM IS VENTED INCORRECTLY, IT MAY CAUSE IMPROPER OPERATION,
FIRE, EXPLOSION, OR ASPHYXIATION.
1. Plan the route of the vent system from the vent termination to the planned
location of the appliance. Layout the total vent system to use the minimum
of vent pipe and elbows possible.
2. The installer may add up to a MAXIMUM OF FIFTY (50) EQUIVALENT
feet of pipe to the exhaust venting arrangement. This addition of FIFTY
(50) EQUIVALENT feet of pipe on both the intake venting arrangement
and exhaust venting arrangement must include any 3 inch PVC elbows
which equals (5) EQUIVALENT feet of pipe.
10
Loading...