A. O. Smith BTN-200A Installation Manual
MODELS BTN 120 THRU 400/A Series 108
COMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER
• INSTALLATION • OPERATION • MAINTENANCE • LIMITED WARRANTY
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.
A DIVISION OF A. O. SMITH CORPORATION
McBEE, SOUTH CAROLINA, USA
www.hotwater.com
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER
AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
Printed in U.S.A. 0603 PART NO. 195714-000
1
ROUGH-IN-DIMENSIONS
FRONT VIEW
TOP
OUTLET
1 1/2” NPT
F
TOP VIEW
TOP
INLET
1 1/2” NPT
BACK VIEW
TABLE 1. ROUGH-IN-DIMENSIONS
Model BTN-120 BTN-154 BTN-180 BTN-199 BTN-200 BTN-250 BTN-275 BTN-310 BTN-366 BTN-400
Dim. Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm
A 63 1800 68 1727 72 1829 72 1829 72 1829 72 1829 72 1829 73 1854 73 1854 73 1854
B 4 1/4 108 4 1/2 114 4 1/2 114 4 1/2 114 4 1/2 114 4 1/2 114 4 1/2 114 4 1/2 114 4 1/2 114 4 1/2 114
C 59 1/2 1511 62 1575 70 1778 70 1778 70 1778 70 1778 70 1778 72 1829 72 1829 72 1829
D 50 7/8 1292 53 5/8 1362 61 5/8 1565 61 5/8 1565 61 5/8 1565 61 5/8 1565 61 5/8 1565 6 2 1/2 1588 6 2 1/ 2 1588 62 1/2 1588
E 19 11/16 500 20 1/2 521 20 1/2 521 20 1/2 521 20 1/2 521 20 1/2 521 20 1/2 521 20 1/2 521 22 1/2 572 22 1/2 572
F 19 483 21 533 21 533 21 533 21 533 21 533 21 533 21 533 21 533 21 533
G 1/2NPT 1/2NPT 1/2NPT 1/2NPT 1/2NPT 1/2NPT 1/2NPT 1/2NPT 1/2NPT 1/2NPT
(gas inlet)
H 51 7/8 1318 54 5/8 1387 61 1549 61 1549 61 1549 61 1549 61 1549 63 1600 63 1600 63 1600
I 5 127 6 152 6 152 6 152 6 152 6 152 6 152 6 152 6 152 6 152
(vent dia)
J 27 3/4 705 27 3/4 705 27 3/4 705 27 3/4 705 27 3/4 705 27 3/4 705 27 3/4 705 27 3/4 705 27 3/4 705 27 3/4 705
K 1 1/2NPT 1 1/2NPT 2NPT 2NPT 2NPT 2NPT 2NPT 1 1/2NPT 1 1/2NPT 1 1/2NPT
L 1 1/2NPT 1 1/2NPT 2NPT 2NPT 2NPT 2 NPT 2NPT 2 NPT 1 1/2NPT 1 1/2NPT
Appox.
Shipping 400 181 470 213 603 274 603 274 603 274 603 274 603 274 725 329 725 329 725 329
Weight lbs. K.g lbs. K.g lbs. K.g lbs. K.g lbs. K.g lbs. K.g lbs. K.g lbs. K.g lbs. K.g lbs. K.g
STD.
Approx.
Shipping - - - - - - - - 686 311 686 311 686 211 833 378 833 378 833 378
Weight lbs. Kg. lbs. Kg. lbs. Kg. lbs. Kg. lbs. Kg. lbs. Kg.
ASME
TABLE 2. RECOVERY CAPACITIES, based on 80% efficiency
TANK APPROX U.S Gallons/Hr. and Litres/Hr at TEMPERATURE RISE INDICATED
Model Btuh KW U.S.Gal. Litres % C° 20C° 22C° 28C ° 30C° 33C° 39C ° 40C° 44C° 50C° 56C° 60C° 61C° 67 C° 70C° 72C° 78C°
BTN-120 120,000 71 80 GPH 320 288 239 213 192 164 160 144 128 115 107 105 96 91 89 82
BTN-154 154,000 81 80 GPH 410 369 295 274 246 211 205 185 184 148 137 134 123 117 114 106
BTN-180 180,000 100 80 GPH 480 432 345 320 288 247 240 218 192 173 160 157 144 137 133 123
BTN-199 199,000 100 80 GPH 530 477 382 353 318 273 265 239 212 191 177 174 159 151 147 136
BTN-200 199,000 100 80 GPH 530 477 382 353 318 273 265 239 212 191 177 174 159 151 147 136
BTN-250 250,000 100 80 GPH 866 600 480 444 400 343 333 300 266 240 222 218 200 190 184 171
BTN-275 275,000 100 80 GPH 733 659 528 488 440 377 366 330 293 264 244 240 220 209 203 188
BTN-310 310,000 85 80 GPH 826 743 595 551 496 425 413 372 330 297 275 270 248 236 229 212
BTN-366 366,000 85 80 GPH 975 878 702 650 585 502 488 439 390 351 325 319 293 279 270 251
BTN-400 390,000 85 80 GPH 1039 935 748 693 624 534 520 468 416 374 346 340 312 297 288 267
CAPACITY EFF. F° 36F° 40F° 50F° 54F° 60F° 70F° 72F° 80F° 90F° 100F° 108F° 110F° 120F° 126F° 130F° 140F°
35 269 LPH 1210 1089 871 807 726 622 605 545 484 436 403 396 363 346 335 311
45 307 LPH 1553 1398 1118 1036 932 79 777 699 621 559 518 508 466 444 430 399
53 307 LPH 1815 1634 1307 1210 1089 934 908 817 726 654 805 594 545 519 503 487
58 307 LPH 2007 1806 1445 1338 1204 1032 1004 903 803 723 669 657 602 573 556 516
58 379 LPH 2007 1806 1445 1338 1204 1032 1004 903 803 723 669 657 602 573 556 516
73 379 LPH 2522 2269 1815 1881 1513 1297 1261 1135 1009 908 841 825 756 720 698 648
81 379 LPH 2774 2496 1997 1849 1664 1426 1387 1248 1109 999 925 908 832 792 768 713
91 322 LPH 3127 2814 2251 2084 1876 1808 1563 1407 1251 1126 1042 1023 938 893 866 804
107 322 LPH 3692 3322 2658 2461 2215 1898 1846 1661 1477 1329 1231 1208 1107 1055 1022 949
114 322 LPH 3934 3540 2832 2622 2360 2023 1967 1770 1573 1416 1311 1287 1180 1124 1089 1011
TABLE 3. GAS AND ELECTRICAL CHARACTERISTICS
Model Type of Gas Inches vs. W.C. kPa Volts/Hz Amperes
BTN 120-400 Natrual 3.5 0.87 120/60 < 5
Manifold Pressure
2
TABLE OF CONTENTS
ROUGH-IN-DIMENSIONS -------------------------------- 2
FOREWORD ------------------------------------------------- 3
GENERAL SAFETY INFORMATION -------------------- 4
Precautions --------------------------------------------------- 4
Grounding Instructions ------------------------------------ 4
Chemical Vapor Corrosion ------------------------------- 4
Improper Combustion ------------------------------------- 4
Extended non-use Periods ------------------------------- 4
Insulation Blankets ----------------------------------------- 4
High Altitude Installation ---------------------------------- 5
FEATURES---------------------------------------------------- 5
High Limit Switch ------------------------------------------- 5
Electronic Ignition Control -------------------------------- 5
Exhaust Inducer (Blower Assy.) ------------------------- 5-6
Circulating Pump ------------------------------------------- 6
Dishwashing Machine Requirement ------------------ 6
INSTALLATION INSTRUCTIONS ------------------------ 6
Required Ability ---------------------------------------------- 6
Uncrating ------------------------------------------------------ 6
Locating The Heater --------------------------------------- 6-7
Levelling ------------------------------------------------------- 7
Clearances --------------------------------------------------- 7
Hard Water ---------------------------------------------------- 7
Air Requirements ------------------------------------------- 7-8
Venting --------------------------------------------------------- 8
Multiple Heater Manifold ---------------------------------- 8
Technical Data Venting ------------------------------------ 9-10
Water Line Connections ---------------------------------- 11
Water (Potable) Heating and Space Heating ------- 11
Thermometers (Not Supplied) -------------------------- 11
Relief Valve --------------------------------------------------- 11
INSTALLATION DIAGRAMS-TOP
INLET/OUTLET USAGE ----------------------------------- 12
General -------------------------------------------------------- 12
Code Restrictions ------------------------------------------ 12
INSTALLATION DIAGRAMS ------------------------------- 13-18
MANIFOLD KITS --------------------------------------------- 19
Heater Wiring ------------------------------------------------ 2 0
Page Page
Gas Piping ---------------------------------------------------- 21
Purging -------------------------------------------------------- 21
Gas Pressure Regulator ---------------------------------- 21-22
OPERATION -------------------------------------------------- 22
General -------------------------------------------------------- 22
Filling ----------------------------------------------------------- 22
SEQUENCE OF OPERATION ---------------------------- 23
Lighting and Operation ------------------------------------ 24
Water Temperature Control ------------------------------ 25
Checking Venting ------------------------------------------- 25
PREVENTIVE MAINTENANCE --------------------------- 2 5
Check The Ignitor Assembly ----------------------------- 2 5
Ignitor Assembly -------------------------------------------- 25-26
Main Burner --------------------------------------------------- 26
Gas Valves ---------------------------------------------------- 26
Checking The Input ----------------------------------------- 26
Venting System ---------------------------------------------- 27
Remote Storage Tank Temperature Control -------- 27
Relief Valve --------------------------------------------------- 2 7
Hot Water Odor ---------------------------------------------- 27
Anode Rod Inspection ------------------------------------- 2 7
Flushing ------------------------------------------------------- 2 7
Draining ------------------------------------------------------- 2 7
Recommended Procedure For Periodic
Removal of Lime Deposits From Tank Type
Commercial Water Heaters ------------------------------ 28
Deliming Solvents ------------------------------------------ 2 8
Tank Cleanout Procedures ------------------------------- 28-29
Ignition Module System ----------------------------------- 29
System Diagnostics ---------------------------------------- 29
SERVICE ------------------------------------------------------ 29
Electrical Servicing ----------------------------------------- 2 9
Replacement Parts, Service Handbooks
and Training Aids ------------------------------------------- 30
Sequence of Operation Flow Chart -------------------- 3 0
Operational Checklist -------------------------------------- 31
Limited Warranty -------------------------------------------- 32
FOREWORD
These designs comply with ANSI Z21.10.3 as an automatic
circulating or automatic storage tank type water heater.
Heaters having an input of 310,000, 366,000, 390,000 Btuh with
a recovery rating of 277.3 gph or more also comply with ANSI
Z21.10.3 as an automatic instantaneous type heater.
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.
The heater is designed to operate on natural gas only. If you
have obtained this heater for use on propane-STOP. Do not
install this water heater. Immediately call your supplier to correct
the situation.
These heaters may be installed on combustible floors.
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.
The installation must conform to these instructions and the local
code authority having jurisdiction. 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
Electrical Code, NFPA 70, documents are available from the
National Fire Protection Association, 1 Batterymarch Park, Quincy,
MA 02269.
3
GENERAL SAFETY
INFORMATION
OPERATION OF THESE FANS CAN PRODUCE A NEGATIVE
DRAFT IN THE AREA OF THE WATER HEATER PREVENTING
THE PRODUCTS OF COMBUSTION FROM EXHAUSTING
THROUGH THE CHIMNEY OR VENT PIPE.
PRECAUTIONS
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.
IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT
OPERATE HEATER UNTIL ALL CORRECTIVE STEPS HAVE
BEEN MADE BY A QUALIFIED SERVICEMAN.
1. EXTERNAL FIRE.
2. DAMAGE.
3. FIRING WITHOUT WATER.
4. SOOTING
GROUNDING INSTRUCTIONS
This water heater must be grounded in accordance with the
National Electric Code and/or local codes. These must be
followed in all cases.
The venting of the water heater should be inspected by a qualified
service technician at the time of installation and periodically
thereafter to ensure a down-draft condition does not exist.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND
VENTILATING AIR. ADEQUATE AIR FOR COMBUSTION AND
VENTILATION MUST BE PROVIDED FOR SAFE OPERATION.
EXTENDED NON-USE PERIODS
WARNING
HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER
SYSTEM SERVED BY THIS HEATER THAT HAS NOT BEEN
USED FOR A LONG PERIOD OF TIME (GENERALLY TWO
WEEKS OR MORE). HYDROGEN GAS IS EXTREMELY
FLAMMABLE. To reduce the risk of injury under these conditions,
it is recommended that the hot water faucet be opened for several
minutes at the kitchen sink before using any electrical appliance
connected to the hot water system. If hydrogen is present, there
will probably be an unusual sound such as air escaping through
the pipe as the water begins to flow. THERE SHOULD BE NO
SMOKING OR OPEN FLAME NEAR THE FAUCET AT THE TIME
IT IS OPEN.
INSULATION BLANKETS
This water heater must be connected to a grounded metal,
permanent wiring system; or an equipment grounding conductor
must be run with the circuit conductors and connected to the
equipment grounding terminal or lead on the water heater, see
Figure 9.
CHEMICAL VAPOR CORROSION
WARNING
CORROSION OF THE FLUEWAYS 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 (water softener salt), waxes, and process
chemicals and typical compounds which are potentially
corrosive. Do not store products of this sort near the heater.
Also, air which is brought in contact with a the heater should not
contain any of these chemicals. If necessary, uncontaminated
air should be obtained from remote or outside sources. The
limited warranty is voided when failure of water heater is due to
a corrosive atmosphere. (Refer to the limited warranty for
complete terms and conditions.
IMPROPER COMBUSTION
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 requirement 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 of the water heater, as this
•
will interfere with safe operation of exhaust inducer.
• Do not cover gas valve on the temperature & pressure relief
valve.
• Do not cover the instruction manual. Keep it on the side of
the water heater or nearby for future reference.
Do not allow insulation to come within 2” (5cm) of the burner,
•
to prevent blockage of combustion air flow to the burners.
• Do not allow insulation to come within 9” (23cm) of the floor,
(within 2” (5cm) of bottom cover) to prevent blockage of
combustion air flow to the burners.
WARNING
ATTIC AND/OR EXHAUST FANS OPERATING ON THE
PREMISES WITH A WATER HEATER CAN RESULT IN CARBON
MONOXIDE POISONING AND DEATH.
• Do inspect the insulation blanket frequently to make sure it
does not sag, thereby obstructing combustion air flow.
• Do obtain new labels from A.O. Smith for placement on the
blanket directly over the existing labels.
4
HIGH ALTITUDE INSTALLATIONS
WARNING
INSTALLATIONS ABOVE 2000 FEET (610 METERS) REQUIRE
REPLACEMENT OF THE BURNER ORIFICE IN ACCORDANCE
WITH SECTION 8.1.2 OF THE NATIONAL FUEL GAS CODE (ANSI
Z223.1). FAILURE TO REPLACE THE ORIFICE WILL RESULT
IN IMPROPER AND INEFFICIENT OPERATION OF THE
APPLIANCE RESULTING IN THE PRODUCTION OF
INCREASED LEVELS OF CARBON MONOXIDE GAS IN EXCESS
OF SAFE LIMITS WHICH COULD RESULT IN SERIOUS
PERSONAL INJURY OR DEATH.
You should contact your gas supplier for any specific changes
which may be required in your area.
As elevation above sea level is increased, there is less oxygen
per cubic foot of air. Therefore, the heater input rate should be
reduced at high altitudes for satisfactory operation with the
reduced oxygen supply. Failure to make this reduction would
result in an overfiring of the heater causing sooting, poor
combustion and/or unsatisfactory heater performance.
REQUIREMENTS
Ratings specified by manufacturers for most appliances apply
for elevations up to 2000 feet. For elevations above 2000 feet,
ratings must be reduced at the rate of 4% for each 1000 feet
above sea level. For example, if a heater is rated at 120,000
Btuh at sea level, to rate the heater at 4000 feet, you subtract 4
(once for each thousand feet) x.04 (4% input reduction) x 120,000
Btuh (original rating) from the original rating. Therefore, to
calculate the input rating at 4,000 feet: 4 x .04 x 120,000 =19,200
Btuh, 120,000 - 19,200 = 100,800 Btuh. At 6000 feet the correct
input rating should be 91,200 Btuh.
The input reduction is primarily achieved by reducing the size of
the main burner orifices. To do this, the main burner orifices
require replacement with orifices sized for the particular
installation elevation. Correct orifice sizing and parts may be
obtained from A.O. Smith Water Products Company. When
ordering, be sure to state the model number and the altitude of
the location where the water heater is being installed.
Continued manual resetting of high limit control, preceded by
higher than usual water temperature is evidence of high limit
switch operation. The following is a possible reason 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 service agent if continued high limit switch
operation occurs.
DIGITAL THERMOSTAT
FIGURE 2
ELECTRONIC IGNITION CONTROL
Each heater is equipped with a ignition module. The solid sate
ignition control (Fig. 3), ignites the main burner by utilizing a
silicone nitride ignitor. The silicone nitride ignitor shuts off during
the heating cycle and the main burner flame is sensed through
a remote flame sensor integral to the silicone nitride ignitor
assembly. The ignition control will try to ignite the main burner
three times before lockout. Then it waits one hour before trying
again to ignite the main burners. This is a continuous cycle.
Upon completion of derating of the heater, adjustment to the gas
pressure regulator may be required. See CHECKING THE
INPUT section in this manual for inlet and manifold pressure
requirements.
Also due to the input rating reduction required at high altitudes,
the output rating of the appliance is also reduced and should be
compensated for in the sizing of the equipment for application.
FEATURES
HIGH LIMIT SWITCH
The digital thermostat (Fig. 2) contains the high limit (energy
cutoff) sensor. The high limit switch interrupts main burner gas
flow should the water temperature reach 203°F (95°C).
In the event of high limit switch operation, the appliance cannot
be restarted unless the water temperature is reduced to
approximately 120°F (49°C). The high limit reset button on the
front of the control then needs to be depressed.
IGNITION CONTROL BOARD
FIGURE 3
EXHAUST INDUCER (BLOWER ASSY.)
All BTN 120-400 models are equipped with an exhaust inducer.
The inducer assists in drawing in fresh air to the unit for
combustion and then assists in dispensing the combustion byproducts into the venting leading outside.
5
The exhaust inducer is equipped with a gravity controlled damper
to reduce the amount of heat loss through the flue, improving
efficiency.
EXHAUST INDUCER
FIGURE 4
CIRCULATING PUMP
SUPPLY, VENTING, GAS SUPPLY AND ELECTRICAL WORK ARE
REQUIRED.
WARNING
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT
IN SERIOUS PERSONAL INJURY OR DEATH.
UNCRATING
The heater is shipped with the inducer already installed. The
wiring conduit runs from the thermostat to the inducer. Before
turning unit on, check to make sure the wiring conduit is securely
plugged into the inducer.
LOCATING THE HEATER
When installing the heater, consideration must be given to proper
location. Location selected should be as close to the stack or
chimney as practicable, with adequate air supply and as
centralized with the piping system as possible.
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 in this 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 operating. Please
refer to manufacturer’s instructions.
DISHWASHING MACHINE REQUIREMENT
These appliances meet the National Sanitation Foundation
Standard for sanitary installations when used with the following
leg kit, Part No. 6570-7.
All dishwashing machines meeting the National Sanitation
Foundation requirements are designed to operate with water
flow pressures between 15 and 25 psi. Flow pressures above
25 psi, or below 15 psi, will result in improperly sanitized dishes.
Where pressures are high, a water pressure reducing or flow
regulating control valve should be used in 180
dishwashing machine, and should be adjusted to deliver water
between these limits.
The National Sanitation Foundation also recommends
circulation of 1800F 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 1800F water at the point of take-off to the
dishwashing machine. Adjust flow by means of the plug cock in
the circulating line.
0
F line to the
INSTALLATION INSTRUCTIONS
REQUIRED ABILITY
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 HEATER’S PILOT OR MAIN BURNER FLAMES
CAUSING FIRE OR EXPLOSION. SOME LOCAL CODES PERMIT
OPERATION OF GAS APPLIANCES IN SUCH AREAS IF THEY
ARE INSTALLED 18” OR MORE ABOVE THE FLOOR. THIS MAY
REDUCE THE RISK IF LOCATION IN SUCH AN AREA CANNOT
BE AVOIDED.
DO NOT INSTALL THIS WATER HEATER DIRECTLY ON A
CARPETED FLOOR. A FIRE HAZARD MAY RESULT. Instead the
water heater must be placed on a metal or wood panel extending
beyond the full width and depth by at least 3 inches in any direction.
If the heater is installed in a carpeted alcove, the entire floor
shall be covered by the panel. Also, see the DRAINING
requirements in MAINTENANCE Section.
THE HEATER SHALL BE LOCATED OR PROTECTED SO IT IS
NOT SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.
WARNING
FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY
OTHER POTENTIAL FIRE HAZARDOUS ARTICLES MUST
NEVER BE PLACED ON OR ADJACENT TO THE HEATER. OPEN
CONTAINERS OR FLAMMABLE MATERIAL SHOULD NOT BE
STORED OR USED IN THE SAME ROOM WITH THE HEATER.
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.
INSTALLATION OR SERVICE OF THIS WATER HEATER
REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED
TRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR
WHEN SUCH LOCATIONS CANNOT BE AVOIDED, A SUITABLE
DRAIN PAN SHOULD BE INSTALLED UNDER THE HEATER.
Such pans should be fabricated with sides at least 2" deep, with
6
length and width at least 2" greater than the diameter of the
heater and must be piped to an adequate drain. The pan must
not restrict combustion air flow.
LEVELING
If the unit is not level, insert the bolts which were used in crating
into the legs to correct this condition.
CLEARANCES
These heaters are approved for installation on combustible
flooring (with Leg Kit #6570-7) in an alcove when the minimum
clearance from any combustion construction are followed as
indicated in figure 5 and Table 4.
In all installations the minimum combustible clearances from
vent piping shall be 6" (152mm). Vent piping passing through a
combustible wall or ceiling must be a continuous run (no joints)
and retain the 6" (152mm) clearance unless an approved
reducing thimble is used.
CLEARANCES TO NONCOMBUSTION CONSTRUCTION
MODEL ”A” ”B” ”C” ”D”
RIGHT LEFT BACK CEILING
SIDE SIDE
BTN-120 0 0 0 12” (305mm)
BTN-154 0 0 0 12” (305mm)
BTN-180 0 0 0 12” (305mm)
BTN-199 0 0 0 12” (305mm)
BTN-200/A 0 0 0 12” (305mm)
BTN-250/A 0 0 0 12” (305mm)
BTN-275/A 0 0 0 12” (305mm)
BTN-310/A 6” (152mm) 6” (152mm) 6” (152mm) 12” (305mm)
BTN-366/A 0 0 0 12” (305mm)
BTN-400/A 0 0 0 12” (305mm)
TABLE 5
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.
A service clearance of 24" (610mm) should be maintained from
serviceable parts, such as relief valves, flue baffles, thermostats,
cleanout openings or drain valves.
The units are approved for installation with side, rear and ceiling
clearances as indicated below:
MINIMUM CLEARANCES TO COMBUSTIBLES IN INCHES (mm)
MODEL ”A” ”B” ”C” ”D”
RIGHT LEFT BACK CEILING
SIDE SIDE
BTN-120 2” (51mm) 2” (51mm) 2” (51mm) 12” (305mm)
BTN-154 2” (51mm) 2” (51mm) 2” (51mm) 12” (305)
BTN-180 2” (51mm) 2” (51mm) 2” (51mm) 12” (305)
BTN-199 2” (51mm) 2” (51mm) 2” (51mm) 12” (305)
BTN-200/A 2” (51mm) 2” (51mm) 2” (51mm) 12” (305)
BTN-250/A 2” (51mm) 2” (51mm) 2” (51mm) 12” (305)
BTN-275/A 2” (51mm) 2” (51mm) 2” (51mm) 12” (305)
BTN-310/A 3” (76mm) 3” (76mm) 3” (76mm) 12” (305)
BTN-366/A 6” (152mm) 6” (152mm) 6” (152mm) 12” (305)
BTN-400/A 3” (76mm) 3” (76mm) 3” (76mm) 12” (305)
TABLE 4
See MAINTENANCE section for details of tank cleanout
procedure.
AIR REQUIREMENTS
REFER TO THE LATEST EDITION OF THE "NATIONAL FUEL
GAS CODE" ANSI Z223.1/NFPA 54.
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE
MATERIALS, GASOLINE AND OTHER FLAMMABLES, VAPORS
AND LIQUIDS.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION OR
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 AIR 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,
ILLUSTRATION OF MINIMUM COMBUSTIBLE CLEARANCES IN AN ALCOVE - FIGURE 5
7
BURNERS AND FLUE TUBES AND CREATES A RISK OF
ASPHYXIATION.
Where an exhaust fan is supplied 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 CHIMNEY, CAUSING POOR
COMBUSTION. SOOTING MAY RESULT IN SERIOUS DAMAGE
TO THE HEATER AND RISK OF FIRE OR EXPLOSION.
UNCONFINED SPACE
In buildings of conventional frame, brick, or stone construction,
unconfined spaces may provide adequate air for combustion,
ventilation and draft hood dilution.
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,
ventilation and draft hood dilution must be obtained from
outdoors. The installation instructions for confined spaces in
tightly constructed buildings must be followed to ensure
adequate air supply.
Heater must be protected from freezing downdrafts.
Remove all soot or other obstructions from the chimney that will
retard a free draft.
Type B venting is recommended with these heaters. For typical
venting application see TECHNICAL DATA VENTING on pages
9 and 10.
This water heater must be vented in compliance with all local
codes, the current revision of the National Fuel Gas Code (ANSIZ223.1) and with the Category I Venting Tables.
If any part of the vent system are exposed to ambient
temperatures below 40°F it must be insulated to prevent
condensation.
• Do not connect the heater to a common vent or chimney with
solid fuel burning equipment. This practice is prohibited by
many local building codes as is the practice of venting gas
fired equipment to the duct work of ventilation systems.
CONFINED SPACE
When drawing combustion and dilution 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 (30.5cm) OF THE ENCLOSURE TOP
AND ONE IN OR WITHIN 12 INCHES (30.5cm) OF THE
ENCLOSURE BOTTOM. Each opening shall have a free area of
at least one square inch per 1000 Btuh (2,225mm
total input of all appliances in the enclosure, but not less than
100 square inches (645 square cm).
If the confined space is within a building of tight construction, air
for combustion, ventilation, and drafthood dilution must be
obtained from outdoors. When directly communicating with the
outdoors or 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 (8,900mm2/Kw)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 (4,450mm2/Kw)of the total input
of all appliances in the enclosure.
2
/Kw) of the
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.
FIGURE 6
• Where a separate vent connection is not available and the
vent pipe from the heater must be connected to a common
vent with an oil burning furnace, the vent pipe should enter
the smaller common vent or chimney at a point above the
large vent pipe.
MULTIPLE HEATER MANIFOLD
Figure 7 and tables on pages 9 and 10 should be used for
horizontally manifolding two or more heaters.
FIGURE 7
8
TABLE 6. TECHNICAL DATA VENTING
TYPE B GAS VENT
Multiple Gas Fired Tank-Type Heaters
When venting multiple tank type heaters using Type B
vent pipe, follow the installation diagram (figure 4) and
tables below which give sizing and data based upon
NFPA 54/ANSI Z223. 1992.
MODEL BTN-120
Input: 120,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 5 inches 6 8 10 15 20 30 50 100
Input Btu/hr Rise Vent Connector Diameter (Inches)
120,000 1 Ft. 6 6 5 5 5 5 5 5
120,000 2 Ft. 5 5 5 5 5 5 5 5
120,000 3 Ft. 5 5 5 5 5 5 5 5
Number of Combined Input
BTN 120 Heaters in Thousands of Btu/hr Manifold and Common Vent Diameter (Inches)
2 240,000 7 7 6 6 6 6 6 6
3 360,000 8 8 7 7 7 6 6 6
4 480,000 9 9 9 8 8 7 7 6
MODEL BTN-154
Input: 154,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100
Input Btu/hr Rise Vent Connector Diameter (Inches)
154,000 1 Ft. 6 6 6 6 6 6 6 6
154,000 2 Ft. 6 6 6 6 6 6 6 6
154,000 3 Ft. 6 6 6 6 6 6 6 6
Number of Combined Input
BTN 154 Heaters in Thousands of Btu/hr Manifold and Common Vent Diameter (Inches)
2 308,000 7 7 6 6 6 6 6 6
3 462,000 8 8 7 7 7 6 6 6
4 616,000 9 9 9 8 8 7 7 6
MODEL BTN-180,199, 200
Input: 180,000, 190,000 and 199,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100
Input Btuh/hr Rise Vent Connector Diameter (Inches)
180,000 1 Ft. 7 7 6 6 6 6 6 6
190,000 1 Ft. 7 7 7 6 6 6 6 6
199,000 1 Ft. 7 7 7 6 6 6 6 6
180,000 2 Ft. 6 6 6 6 6 6 6 6
190,000 2 Ft. 7 6 6 6 6 6 6 6
199,000 2 Ft. 7 7 6 6 6 6 6 6
180,000 3 Ft. 6 6 6 6 6 6 6 6
190,000 3 Ft. 6 6 6 6 6 6 6 6
199,000 3 Ft. 6 6 6 6 6 6 6 6
Number of Combined Input
BTN Heaters in Thousands of Btu/hr Manifold & Common Vent Diameter (Inches)
360,000 7 7 6 6 6 6 6 6
2 380,000 7 7 7 6 6 6 6 6
398,000 6 7 7 6 6 6 6 6
540,000 7 6 6 6 6 6 6 6
3 570,000 7 6 6 6 6 6 6 6
597,000 6 7 6 6 6 6 6 6
720,000 6 6 6 6 6 6 6 6
4 760,000 6 6 6 6 6 6 6 6
796,000 6 6 6 6 6 6 6 6
9
TABLE 6. TECHNICAL DATA VENTING (Continued)
MODEL BTN-250
Input: 250,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100
Input Btuh/hr Rise Vent Connector Diameter (Inches)
250,000 1 Ft 8 8 7 7 7 6 6 6
250,000 2 Ft 7 7 7 7 6 6 6 6
250,000 3 Ft 7 7 7 7 6 6 6 6
Number Combined Input
BTN 250 of Heaters in Thousands of Btu/hr Manifold and Common Vent Diameter (Inches)
2 500,000 9 9 9 8 8 7 7 7
3 750,000 12 12 10 10 10 9 8 8
4 1,000,000 14 14 12 12 10 10 9 9
MODEL BTN-275
Input: 275,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100
Input Btu/hr Rise Vent Connector Diameter (Inches)
275,000 1 Ft 8 8 7 7 6 6 6 6
275,000 2 Ft. 8 8 7 7 6 6 6 6
275,000 3 Ft 7 7 7 7 6 6 6 6
Number of Combined Input
BTN 275 Heaters in Thousands of Btu/hr Manifold and Common Vent Diameter (Inches)
2 550,000 10 9 9 8 8 8 7 7
3 825,000 12 12 12 10 9 9 8 8
4 1,100,000 14 14 14 12 12 10 9 9
MODEL BTN-310
Input: 310,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100
Input Btu/hr Rise Vent Connector Diameter (Inches)
310,000 1 Ft. 9 8 8 8 7 7 6 6
310,000 2 Ft. 8 8 8 7 7 7 6 6
310,000 3 Ft. 8 8 8 7 7 7 6 6
Number of Combined Input
BTN 310 Heaters in Thousands of Btu/hr Manifold & Common Vent Diameter
2 620,000 10 10 9 9 8 8 7 7
3 930,000 14 12 12 12 10 9 9 8
4 1,240,000 14 14 14 12 12 12 10 9
MODEL BTN-366, 400
Input: 366,000, 399,000 Btu/hr Total Vent Height (Feet)
Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100
Input Btu/hr Rise Vent Connector Diameter (Inches)
366,000 1 Ft 9 9 9 8 8 8 8 8
399,000 1 Ft 10 9 9 9 8 8 8 8
366,000 2 Ft 9 9 8 8 8 8 8 8
399,000 2 Ft 9 9 9 8 8 8 8 8
366,000 3 Ft 9 8 8 8 8 8 8 8
399,000 3 Ft 9 9 8 8 8 8 8 8
Number of Combined Input
BTN Heaters in Thousands of Btu/hr Manifold & Common Vent Diameter (Inches)
2 732,000 12 10 10 9 9 9 8 8
798,000 12 12 10 10 9 9 8 8
3 1,098,000 14 14 14 12 12 10 9 9
1,197,000 14 14 14 12 12 10 10 9
4 1,464,000 16 16 14 14 14 12 12 10
1,596,000 16 16 16 14 14 12 12 10
10
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