A.O. Smith BTX-80 User Manual
MODEL BTX-80
COMMERCIAL GAS WATER HEATER
Glass-Lined Tank-Type Water Heater
Thank you for buying this energy efficient water heater.
We appreciate your confidence in our products.
You should thoroughly read this manual before installation and/
or operation of this water heater. Please pay particular attention
to the important safety and operating instructions as well as the
WARNING and CAUTIONS.
TABLE OF CONTENTS
P AGE
GET TO KNOW YOUR WA TER HEATER 2-3
GENERAL SAFETY INFORMATION 4-5
INSTALLATION 5-16
OPERA TION 16-18
MAINTENANCE AND
TROUBLESHOOTING 18-21
TROUBLESHOOTING WITH THE LED 22
LIMITED WARRANTY 23
CAUTION
TEXT PRINTED OR OUTLINED IN RED CONT AINS INFORMATION
RELATIVE TO YOUR SAFETY. PLEASE READ THOROUGHLY
BEFORE INSTALLING AND USING THIS APPLIANCE.
A DIVISION OF A.O. SMITH CORPORA TION
McBEE, SOUTH CAROLINA, U.S.A.
www.aosmithwaterheaters.com
KEEP THIS MANUAL IN THE POCKET ON THE HEA TER FOR FUTURE REFERENCE
WHENEVER MAINTENANCE ADJUSTMENT OR SER VICE IS REQUIRED.
PRINTED IN THE U.S.A. 0406 PART NO. 197086-000
1
ROUGH-IN-DIMENSIONS
Rough-In-Dimensions
Model Units A B C D E F G H J K
BTX-80
Top/Side Inlet and Outlet: 3/4" NPT
Inches 70.62 68.20 51.90 20.90 9.15 12.00 22.00 8.00 15.81 26.92
cm 179.37 173.23 131.83 53.09 23.24 30.48 55.88 20.32 40.16 68.38
Gas Inlet: 1/2" NPT
Capacity and Gas and Electrical Characteristics
Model
Approximate Capacity Manifold Pressure Electrical Characteristics
U.S. Gals. Liters Gas Type “WC kPA Volts/Hz Amperes
BTX-80 50 189 Nat. 4.00 0.99 120/60 <5
All models - Maximum Supply Pressure: 14 inches W.C. (3.48kPa)
Minimum Supply Pressure Natural Gas: 5.0 inches W.C. (1.24kPa)
Minimum Pressure must be maintained under both load and no load (static and dynamic) conditions.
Recovery Capacities - U.S. Gallons/Hr. and Liters/Hr. at Temperature Rise Indicated
Model
BTX-80 76,000 22.25
Recovery capacity based on 90% thermal efficiency.
Input Recovery Capacities
Rating
(Btu /h r)
Rating
(kW)
Temp.
Rise
F° 30 40 50 60 70 80 90 100 110 120 130 140
C° 17 22 28 33 39 44 50 56 61 67 72 78
GPH 275 206 165 138 118 104 92 83 75 69 64 59
LPH 1041 780 625 522 447 394 348 314 284 261 242 223
2
TYPICAL INST ALLATION
REPLACEMENT P ARTS AND DELIMING PRODUCTS
Replacement parts and recommended delimer may be ordered
through authorized servicers or distributors. When ordering parts,
provide complete model and serial numbers (see rating plate),
quantity and name of part desired. (See Replacement Parts Insert
for list of part numbers and descriptions.) St andard hardware items
may be purchased locally.
(A) VENT PIPE
(B) ANODE
(C) HOT WATER OUTLET
(D) OUTLET (120 V A C)
(F) GAS SUPPL Y
(G) MAIN MANUAL GAS
SHUT OFF VA LVE
(H) GROUND JOINT UNION
(J) DIRT LEG
(K) OUTER DOOR
(L) UNION
(M) INLET WATER SHUT
OFF VALVE
(N) COLD WATER INLET
(O) INLET DIP TUBE
(P) TEMPERATURE AND
PRESSURE RELIEF VALVE
(Q) RATING PLA TE
(R) INSULATION
(S) VENT TERMINAL
(T) DRAIN VALVE
(U) IGNITER AND MAIN
BURNER
(W) DRAIN PAN
(X) CONTROL
(Y) CONTROL HARNESS*
(AA) MOTOR & BLOWER
(CC) CONDENSATE FITTING
(4 Places as Shown)**
(DD) PLASTIC TOP
(EE) ON/OFF SWITCH
(FF) EXHAUST TEE
(GG) ELBOW
(HH) BUSHING
(II) NIPPLE
(JJ) CONDENSATE TEE
(KK) HOSE BARB
(LL) PLUG
(MM) VENT PIPE ASSEMBLY #1
(NN) VENT PIPE ASSEMBLY #2
(OO) VENT PIPE ASSEMBLY #3
(PP) SIDE RECIRCULATION
LOOP INLET***
(QQ) SIDE RECIRCULATION
LOOP OUTLET*** (not shown)
(RR) VENT A TTENUA TION
ASSEMBLY (V AA) (Optional)
CONDENSA TE ASSEMBLY
* CAUTION HARNESS HAS 120 VAC. IN OPERATION.
** See "PLANNING THE VENT SYSTEM", "CONDENSATE" and "PREPAR A TION
OF BLOWER ASSEMBLY" in the "INSTALLATION" section for more
information.
*** The side recirculation loop connections may not be used as the primary water
inlet and outlet connections. For your convenience, plugs are installed in
these fittings at the factory. Remove these plugs if needed for your specific
installation. Otherwise (as with all connections) check for leaks while filling
the tank with water and after completing the installation.
(U) NA TURAL GAS MAIN BURNER
WITH IGNITER ASSEMBL Y
SIDE VIEW
VACUUM RELIEF
VALVE
*INSTAL L P ER
LOCAL CODES
TEMPERATURE INDICATORS
(X)
TEMPERATURE ADJUSTMENT BUTTONS
FIGURE 1
3
GENERAL SAFETY INFORMA TION
EXTERNAL DAMAGE
Do not operate the water heater until it has been fully checked
out by a qualified technician, if the water heater:
• Has been exposed to fire or damage.
• Displays evidence of sooting.
• Produces steam or unusually hot water.
If the water heater has been subject to flooding it must be
replaced.
LP gas must be used with great caution. It is highly explosive
and heavier than air. It collects first in the low areas making its
odor difficult to detect at nose level. If LP gas is present or even
suspected, do not attempt to find the cause yourself. Go to a
neighbor's house, leaving your doors open to ventilate the house,
then call your gas supplier or service agent. Keep area clear
until a service call has been made.
At times you may not be able to smell an LP gas leak. One cause
is odor fade, which is a loss of the chemical odorant that gives LP
gas its distinctive smell. Another cause can be your physical
condition, such as having a cold or a diminishing sense of smell
with age. For these reasons, the use of a propane gas detector
is recommended.
CHEMICAL V APOR 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 are typical compounds which are potentially corrosive.
Do not store products of this sort 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. The limited warranty is
voided when failure of water heater is due to a corrosive
atmosphere. (See limited warranty for complete terms and
conditions).
IMPROPER COMBUSTION
WARNING
ATTIC AND/OR EXHAUST FANS OPERATING ON THE
PREMISES WITH A W A TER HEATER CAN RESUL T IN CARBON
MONOXIDE POISONING AND DEA TH.
OPERATION OF THESE FANS CAN PRODUCE A NEGATIVE
DRAFT IN THE AREA OF THE W ATER HEATER PREVENTING
THE PRODUCTS OF COMBUSTION FROM EXHAUSTING
THROUGH THE VENT PIPE.
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.
IF YOU EXPERIENCE AN OUT-OF-GAS SITUATION, DO NOT
TRY TO RELIGHT APPLIANCES YOURSELF. Ask your LP
delivery person to relight pilots for you. Only trained LP
professionals should conduct the required safety checks in
accordance with industry standards.
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).
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.
SMOKING OR OPEN FLAME NEAR THE FAUCET A T THE TIME
IT IS OPEN.
HYDROGEN GAS IS EXTREMELY
THERE SHOULD BE NO
INSULA TION BLANKETS
Insulation blankets available to the general public for
external use on gas water heaters are not necessary with
this water heater. The purpose of an insulation blanket is
to reduce the standby heat loss encountered with storage
tank heaters. Your water heater meets and exceeds the
Energy Policy Act 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 (See Figure 1 for
identification of components mentioned below). Failure to
follow these instructions can restrict the air flow required for
proper combustion, potentially resulting in fire, asphyxiation,
serious personal injury or death.
LIQUID PETROLEUM MODELS
WARNING
Water heaters for propane or liquefied petroleum gas (LPG) are
different from natural gas models. A natural gas heater will not
function safely on LP gas and no attempt should be made to
convert a heater from natural gas to LP gas.
• Do not cover the gas valve or temperature & pressure relief
valve.
•
Do not allow insulation to come within 2" of the blower.
• Do not allow insulation to come within 2" of the floor to prevent
blockage of combustion air flow to the burner.
4
• Do not cover the instruction manual. Keep it on the side of the
water heater or nearby for future reference.
heater differ from standard clearances, install water heater
according to clearances stated on heater.
•
Do obtain new warning and instruction labels for placement
on the blanket directly over the existing labels.
•
Do inspect the insulation blanket frequently to make certain it
does not sag, thereby obstructing combustion air flow.
INSTALLATION
REQUIRED ABILITY
INSTALLATION OR SERVICE OF THIS WATER HEATER
REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED
TRADESMAN IN THE FIELD INVOL VED. PLUMBING , ELECTRICAL
AIR SUPPLY, VENTING AND GAS SUPPL Y ARE REQUIRED.
GENERAL
The heater is designed to operate on natural or propane gases.
HOWEVER, MAKE SURE the gas on which the heater will operate
is the same as that specified on the heater model and rating plate.
The installation must conform to these instructions and the local
code authority having jurisdiction. In the absence of local codes,
the installation must conform to the current edition of National
Fuel Gas Code ANSI Z223.1/NFPA 54 and the National Electrical
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.
GROUNDING
The water heater, when installed, must be grounded in accordance
with local codes, or in the absence of local codes:
The National Electrical Code, NFPA 70
HIGH AL TITUDE INST ALLA TION
CAUTION
INSTALLA TIONS ABOVE 2000 FT . REQUIRE REPLACEMENT OF
THE BURNER ORIFICE IN ACCORDANCE WITH THE NA TIONAL
FUEL GAS CODE (ANSI Z223.1/NFPA 54). FAILURE TO
REPLACE THE ORIFICE COULD RESULT IN IMPROPER AND
INEFFICIENT OPERATION OF THE APPLIANCE, PRODUCING
CARBON MONOXIDE GAS IN EXCESS OF SAFE LIMITS, WHICH
COULD RESULT IN SERIOUS PERSONAL INJURY OR DEATH.
CONTACT YOUR GAS SUPPLIER FOR ANY SPECIFIC
CHANGES WHICH MAY BE REQUIRED IN YOUR AREA.
SOME MODELS ARE SPECIFICALLY BUILT FOR HIGH
AL TITUDE SERVICE.
A minimum clearance of 4" must be allowed for access to
replaceable parts such as the thermostats, drain valve and relief
valve. A top clearance of 24" should be allowed for blower
assembly service.
Adequate clearance for servicing this appliance should be
considered before installation, such as changing the anodes,
etc. Minimum clearances for proper operation are given above.
WARNING
In cold climates provide protection against freeze-up.
Installation of the water heater must be accomplished in such a
manner that if the tank or any connections should leak, the flow will
not cause damage to the structure.
to install the water heater in an attic or upper floor. When such
locations cannot be avoided, a suitable drain pan should be installed
under the water heater. Drain pans are available at your local
hardware store. Such a drain pan must have a minimum length
and width of at least 2 inches (51 mm) greater that the water heater
dimensions and must be piped to an adequate drain. The pan must
not restrict combustion air flow.
Water heater life depends upon water quality , water pressure and
the environment in which the water heater is installed. Water
heaters are sometimes installed in locations where leakage may
result in property damage, even with the use of a drain pan piped
to a drain. However, unanticipated damage can be reduced or
prevented by a leak detector or water shut-off device used in
conjunction with a piped drain pan. These devices are available
from some plumbing supply wholesalers and retailers, and detect
and react to leakage in various ways:
• Sensors mounted in the drain pan that trigger an alarm or turn off
the incoming water to the water heater when leakage is detected.
• Sensors mounted in the drain pan that turn off the water supply
to the entire home when water is detected in the drain pan.
• Water supply shut-off devices that activate based on the water
pressure differential between the cold water and hot water pipes
connected to the water heater.
• Devices that will turn off the gas supply to a gas water heater
while at the same time shutting off its water supply.
DO NOT INSTALL THIS WATER HEATER DIRECTLY ON A
CARPETED FLOOR. A FIRE HAZARD MAY RESULT.
the water heater must be placed on a metal or wood panel
extending beyond the full width and depth by at least 3 inches
(76.2 mm) in any direction. If the heater is installed in a carpeted
alcove or closet, the entire floor shall be covered by the panel.
For this reason, it is not advisable
WARNING
Instead
PLEASE CHECK THE RATING PLATE BEFORE MAKING
CHANGES.
LOCA TION OF HEATER
When installing the heater , consideration must be given to proper
location. Location selected should be as close to the wall as
practicable with adequate air supply and as centralized with the
water piping system as possible.
The heater is designed for installation on combustible flooring in
a closet having minimum clearances from combustible material
of: 0" clearance from sides and rear, 5.5" from the front and 12"
from the top. (Standard clearance.) If clearances stated on the
AIR REQUIREMENTS
In calculating the free area of a vent opening, the blocking effect
of screens, louvers and grills should be considered. Screens
shall not be of a mesh smaller than 1/4 inch square. If the free
area is not known, the current edition of National Fuel Gas Code
ANSI Z223.1 recommends using figures of 20-25 percent free
area for wood louvers or 60-75 percent for metal grills or louvers.
UNCONFINED SP ACE
In buildings of conventional frame, brick or stone construction,
unconfined spaces may provide adequate air for combustion
and ventilation air for the power venter.
5
If the unconfined space is within a building of tight construction
(building 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 must be followed.
CONFINED SP ACE
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 WITHIN 12 INCHES
OF THE ENCLOSURE TOP AND ONE WITHIN 12 INCHES OF
THE ENCLOSURE BOTTOM. Each opening shall have a free
area of one square inch per 1000 Btu/hr 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 or communicating 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 Btu/hr 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 Btu/hr of the total input of all appliances in the enclosure.
3. This unit may NEVER be connected to any existing heating
system or component(s) previously used with a non-potable
water heating appliance.
4. When the system requires water for space heating at
temperatures higher than required for domestic water
purposes, a tempering valve must be installed. Please refer
to Fig. 2 for suggested piping arrangement.
FIGURE 2
CLOSED WATER SYSTEM
WATER CONNECTIONS
Refer to figure 1 for typical installation. A suitable pipe thread
sealant must be used to prevent leakage. Please note that the
side connection plugs are not factory installed. Plugs are supplied
in a kit with the water heater.
WATER (POT ABLE) HEATING AND SPACE HEA TING
1. All piping components connected to this unit for space heating
applications shall be suitable for use with potable water.
2. Toxic chemicals, such as those used for boiler treatment, shall
NEVER be introduced into this system.
A closed system will exist if a back-flow preventer (check valve),
pressure reducing valve, or other similar device is installed in the
cold water line between the water heater and the street main (or
well). Excessive pressure may develop due to the thermal
expansion of heated water causing premature tank failure or
intermittent relief valve operation. This type of failure is not covered
by the limited warranty. An expansion tank may be necessary in
the cold water supply to alleviate this situation, see Fig. 1. Contact
the local plumbing authority.
If the temperature and pressure relief valve on the appliance
discharges periodically, this may be due to thermal expansion in
a closed water supply system. Contact the water supplier or local
plumbing inspector on how to correct situation. DO NOT PLUG
THE TEMPERATURE AND PRESSURE RELIEF VALVE.
GAS CONNECTIONS
The minimum gas supply pressure for input adjustment is 5.0"
W.C. for natural gas.
THE HEATER IS NOT INTENDED FOR OPERA TION AT HIGHER
THAN 14" WA TER COLUMN SUPPL Y PRESSURE. EXPOSURE
TO HIGHER GAS SUPPL Y PRESSURE MAY CAUSE DAMAGE
TO THE CONTROL WHICH COULD RESULT IN FIRE OR
EXPLOSION.
improper testing of gas lines or emergency malfunction of the
supply system, the control must be checked for safe operation.
Make sure that the outside vents on the supply regulators and
the safety vent valves are protected against blockage. These are
parts of the gas supply system not the heater . V ent blockage may
occur during ice storms.
IT IS IMPORTANT TO GUARD AGAINST CONTROL FOULING
FROM CONT AMINANTS IN THE GAS WAYS. SUCH FOULING
MA Y CAUSE IMPROPER OPERATION, FIRE OR EXPLOSION.
All gas piping must comply with local codes and ordinances or
with the National Fuel Gas Code (ANSI Z223.1 / NFPA-54)
whichever applies.
6
If overpressure has occurred such as through
VENT HOOD(S) MAY BE
WARNING
EXTREMELY HOT
DURING OPERA TION.
FIGURE 3
REFER TO FIG. 1 FOR CONNECTION DETAILS. BEFORE
ATTACHING THE GAS LINE BE SURE THAT ALL GAS PIPE IS
CLEAN ON THE INSIDE.
TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS
SUPPLY LINE, A DIRT LEG (SOMETIMES CALLED DRIP LEG)
MUST BE INCORPORA TED IN THE PIPING, FIGURE 1. The dirt
leg must be readily accessible. Install in accordance with
recommendations of serving gas supplier. Refer to the current
edition of ANSI Z223.1.
To prevent damage, care must be taken not to apply too much
torque when attaching gas supply pipe to thermostat gas inlet.
The thermostat inlet has a pad for use with a backup wrench.
Apply joint compounds (pipe dope) sparingly and only to the male
threads of pipe joints. Do not apply compound to the first two
threads. Use compounds resistant to the action of liquefied
petroleum gases. Do not use teflon tape on thermostat fittings.
CONNECTION OF GAS PIPE
1. When connecting gas pipe to unit, apply wrench to flange
only. Note: Do not use wrench on gas valve or gas valve
bracket.
2. PERFORM THE GAS LEAK TEST AN Y TIME WORK IS DONE
ON A GAS SYSTEM TO AVOID THE POSSIBILITY OF FIRE
OR EXPLOSION WITH PROPERTY DAMAGE, PERSONAL
INJURY, OR LOSS OF LIFE.
The Gas Leak Test is performed as follows: Paint pipe
connections upstream of gas control with a rich soap and
water solution to test for leaks before operating main
burner. Bubbles indicate gas leak. To stop leak, tighten
pipe connections. After piping connections are checked,
turn on main burner. (See Lighting and Operating
Instructions in this manual or on water heater.) With main
burner in operation, paint pipe joints (including flanges),
and control inlet and outlet with rich soap and water
solution. Bubbles indicate gas leak. To stop leak, tighten
flange screws, joints and pipe connections. Replace part
if leak can't be stopped.
DISCONNECT THE APPLIANCE AND ITS INDIVIDUAL SHUT OFF
VAL VE FROM THE GAS SUPPL Y PIPING SYSTEM DURING ANY
SUPPLY PRESSURE TESTING EXCEEDING 1/2 PSI (3.5 kPa).
GAS SUPPLY LINE MUST BE CAPPED WHEN DISCONNECTED
FROM THE HEATER. FOR TEST PRESSURES AT 1/2 PSI (3.5
kPa) OR LESS, THE APPLIANCE NEED NOT BE
DISCONNECTED, BUT MUST BE ISOLA TED FROM THE SUPPL Y
PRESSURE TEST BY CLOSING THE MAIN MANUAL GAS VAL VE.
BEFORE PLACING THE HEATER IN OPERATION, CHECK
FOR GAS LEAKAGE. USE SOAP AND WATER SOLUTION
OR OTHER MATERIAL ACCEPTABLE FOR THIS PURPOSE.
DO NOT USE MATCHES CANDLES, FLAME OR OTHER
SOURCES OF IGNITION TO LOCATE GAS LEAKS.
RELIEF V ALVE
A NEW TEMPERATURE AND PRESSURE RELIEF VALVE
COMPLYING WITH THE ST ANDARD FOR RELIEF V AL VES AND
AUTOMATIC GAS SHUT OFF DEVICES FOR HOT WATER
SUPPLY SYSTEMS, ANSI Z21.22 (CURRENT EDITION) MUST
BE INSTALLED IN THE HEATER IN THE MARKED OPENING
PROVIDED. THE VALVE MUST BE OF A SIZE (INPUT RATING)
THAT WILL BE ADEQUATE FOR YOUR SIZE HEATER.
Check the metal tag on the relief valve and compare it to the heater’s
rating plate. The pressure rating of relief valve must not exceed the
working pressure shown on the rating plate of the heater. In addition
the hourly Btu rated temperature steam discharge capacity of the
relief valve shall not be less than the input rating of the heater. NO
VALVE IS TO BE PLACED BETWEEN THE RELIEF VA LVE AND
TANK. DO NOT PLUG THE RELIEF VAL VE.
7
The drain line connected to this valve must not contain a reducing
coupling or other restriction and must terminate near a suitable
drain to prevent water damage during valve operation. The
discharge line shall be installed in a manner to allow complete
drainage of both the valve and line.
DO NOT THREAD, PLUG
OR CAP THE END OF THE DRAIN LINE.
combustible materials must be provided in accordance with
information in this manual under LOCATION OF HEATER and
INSTALLATION OF VENT SYSTEM, and with the National Fuel
Gas Code and local codes.
PLANNING THE VENT SYSTEM
VENT PIPE ASSEMBLY
There are three parts of the vent pipe assembly that connect the
water heater exhaust (located on the lower back side of the water
heater) to the inlet of the blower assembly (mounted on top of the
water heater) as shown in Figure 1. These parts will need to be
assembled according to the instructions in the VENT PIPE
PREPARATION section of this manual. These PVC parts should
be assembled with ASTM D-2564 grade cement.
Assemble Vent Pipe Assemblies #1, #2 and #3 (See Figure 1)
prior to cementing. The preferred orientation of Vent Pipe
Assembly #1 (Condensate U-Assembly) is shown in Figure 4.
However this assembly may be rotated to a different orientation
as needed for the specific installation requirements. Note the
rotational orientation of each p art by marking a line several inches
long across the joints. The long tube of Vent Pipe Assembly #2
should be approximately vertical. If it is found that either of the
two pieces of pipe in Vent Pipe Assembly #2 are too long for
proper fit-up, then remove as little material as possible to improve
the fit-up. Keep in mind that the pipes will insert slightly further
into the elbows when cement is applied as it acts as a lubricating
agent. The vertical distance from the bottom of the Condensate
U-Assembly to the floor that supports the water heater should be
approximately 0.25" (See Figure 4). Disassemble the parts and
cement back together using the alignment marks. After the cement
dries, attach the assembly to the blower and the water heater
exhaust using the supplied rubber boots and hose clamps.
A condensate trap is incorporated in the bottom of this vent pipe
assembly. See the CONDENSATE section of this manual for
further details.
VENTING
Plan the route of the vent system from the discharge of the blower
to the planned location of the vent terminal.
1. Layout the total vent system to use a minimum of vent pipe
and elbows.
2. This water heater is capable of venting the flue gases the
equivalent of twenty-five (25) feet of 2 inch pipe, sixty-five (65)
feet of 3 inch pipe, or one-hundred twenty-eight (128) feet of 4
inch pipe as listed in Table 1.
TABLE 1
Number of 2" Maximum 3" Maximum 4" Maximum
90° Elbows Pipe (Feet) Pipe (Feet) Pipe (Feet)
1 20 60 120
215 55112
3 10 50 104
4-- 4596
5-- 4088
6-- 3580
The minimum vent lengths for each of the pipe sizes is one
90° on top of the unit plus 2' of straight pipe and the appropriate
termination.
NOTE: The equivalent feet of pipe listed above are exclusive
of the termination. That is, the termination, with an installed
screen, is assumed to be in the system and the remainder of
the system must not exceed the lengths discussed above.
3. The blower discharge adapter is made to accept only straight
sections of 2" pipe. To start, a minimum of 2 inches of 2" pipe
must be attached to the blower discharge (See figure 5).
WARNING
NEVER OPERATE THE HEATER UNLESS IT IS VENTED TO
THE OUTDOORS AND HAS ADEQUA TE AIR SUPPLY TO AVOID
RISKS OF IMPROPER OPERATION, FIRE, EXPLOSION OR
ASPHYXIATION.
VENT PIPE TERMINATION
The first step is to determine where the vent pipe will terminate.
See Figures 3, 8 and 9. The vent may terminate through a sidewall
as shown in Figure 8 or through the roof as shown in Figure 9.
IMPORT ANT
The vent system must terminate so that proper clearances are
maintained as cited in local codes or the current edition of the
National Fuel Gas Code, ANSI Z223.1, 12.9.1 through 12.9.4.
Instructions on proper installation through a sidewall are provided
in Figure 3.
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
If using 2" inch vent pipe:
A minimum of 2 inches must be att ached to the blower before
the first elbow. After the first elbow add the additional venting
required for the installation. The total system cannot exceed
the lengths discussed above, where each elbow is equal to 5
feet of straight pipe.
If using 3" or 4" inch vent pipe:
Two inches of pipe must be attached to the blower discharge
before adding a reducer to acquire the desired pipe diameter.
An appropriately sized 45 degree elbow (supplied locally – a
schedule 40 DWV) vent terminal must be obtained with an
equivalent screen (supplied in vent kit). The total system cannot
exceed the equivalent pipe lengths discussed above where
each elbow is equal to 5 feet of straight pipe (3" vent pipe) or
8 feet of straight pipe (4" vent pipe).
NOTE: This unit can be vented using only PVC (Class 160,
ASTM D-2241; Schedule 40, ASTM D-1785; or Cellular
Core Schedule 40 DWV , ASTM F-891), Schedule 40 CPVC/
ASTM F-441), or ABS/ASTM D-2661) pipe. The fittings,
other than the
TERMINATION should be equivalent to PVCDWV fittings meeting ASTM D-2665 (Use CPVC fittings,
ASTM F-438 for CPVC pipe and ABS fittings, ASTM D2661/3311 for ABS pipe. If CPVC or ABS pipe and fittings
are used, then the proper cement must be used for all
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