A.O. Smith BTH 120-250A User Manual

CYCLONE XHE® Model BTH 120-250(A)

SERIES 970 AND 973

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 IN BLACK BOLD TYPE OR UNDERLINED 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. 1104

A DIVISION OF A.O. SMITH CORPORATION

Mc BEE, SOUTH CAROLINA

PART NO. 196145-001

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CYCLONE XHE BTH 120 - 250 ROUGH-IN-DIMENSIONS

GAS VALVE PIPING
BTH-120		1/2" NPT
BTH-150,
199 & 250		3/4" NPT
Table 1. RECOVERY CAPACITIES - NATURAL GAS / L.P.
							Approx.										TEMPERATURE RISE - DEGREES °F - GALLONS PER HOUR
		Input					Gallon
Model		BTU/Hr.					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		185,000 L.P.				100					703			527			422		351		301		263		234	211		192		176		162		151
BTH - 250		240,000 Nat.				100					912			684			547		456		391		342		304	274		248		228		210		195
				Approx.													TEMPERATURE RISE - DEGREES °C - LITERS PER HOUR
		Input			Liter
Model		kW		Capacity						17°C			22°C			28°C			33°C		39°C		44°C		50°C	56°C		61°C		67°C		72°C		78°C
BTH - 120		37 Nat.			227					1798			1348			1079		898		768		674		598		538		488		450		416		386
BTH - 120		35 L.P.			227					1726			1295			1037		863		738		647		575		519		469		432		397		371
BTH - 150		44 Nat.			379					2158			1616			1295		1079		924		810		719		647		587		538		500		462
BTH - 150		44 L.P.			379					2158			1616			1295		1079		924		810		719		647		587		538		500		462
BTH - 199		58 Nat.			379					2873			2154			1726		1438		1230		1079		958		863		784		719		662		617
BTH - 199		54 L.P.			379					2661			1995			1597		1329		1139		996		886		799		727		666		613		572
BTH - 250		70 Nat.			379					3452			2589			2071		1726		1480		1295		1151		1037		939		863		795		738

Recovery capacities are based on heater performance at 94% thermal efficiency.

FOREWORD

These designs comply with the latest version of the American National Standard for Gas Water Heaters, Volume III, ANSI Z21.10.3 / CSA 4.3 M 98 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.

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 CAN/CSA 149.1 or .2 and CSA 2C22.1. The former is available from the CSA International, 8501 East Pleasant Valley Road, Cleveland, OH 44131, and both documents are available from the

National Fire ProtectionAssociation, 1 Batterymarch Park, Quincy, MA 02269.

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TABLE OF CONTENTS

	PAGE
ROUGH-INDIMENSIONS ...................................................................	2
FOREWORD ......................................................................................	2
FEATURES ........................................................................................	3,4
Water Temperature Control ..........................................................	3
High Limit Switch (E.C.O.) ............................................................	4
Dishwashing Machine Requirement ............................................	4
Circulating Pump ...........................................................................	4
INSTALLATION INSTRUCTIONS ........................................................	4-13
Required Ability ............................................................................	4
Insulation Blankets .......................................................................	4,5
Locating The Heater .....................................................................	5
Clearances ...................................................................................	5
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 ...................................................................	6-8
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
CONTROL 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

	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
OPERATIINGINSTRUCTIONS ...........................................................	18
Adjustment Procedure (Initial Start-Up) ......................................	18
Lighting Instructions ....................................................................	19
Cathodic Protection .....................................................................	20
Precautions .................................................................................	20
GENERALINFORMATION ................................................................	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
CHECKLISTAND SERVICE INFORMATION ......................................	29
TROUBLE-SHOOTING ......................................................................	29,30
REPLACEMENTPARTS ....................................................................	30
LIMITED WARRANTY .......................................................................	31

FEATURES

IMPORTANT

IT IS REQUIRED THATAQUALIFIED 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 OPERATIONAND MAINTENANCE OF THE UNIT.

A CHECKLISTAND 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

DANGER

THIS WATER HEATER IS EQUIPPED WITHANADJUSTABLE THERMOSTAT TO CONTROL WATER TEMPERATURE. HOT WATER TEMPERATURES REQUIRED FOR AUTOMATIC DISHWASHER AND LAUNDRY USE CAN CAUSE SCALD BURNS RESULTING IN SERIOUS PERSONAL INJURYAND/ OR DEATH. THE TEMPERATURE AT WHICH INJURY OCCURS VARIES WITH THE PERSON’S AGE AND THE TIME OF THE EXPOSURE. THE SLOWER RESPONSE TIME OF CHILDREN, AGED OR 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°F/27°C to 185°F/85°C. The thermostat was adjusted to 120°F/49°C 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,

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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/49°C 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/11°C. If you experience this type of use, you should consider using lower temperature settings to reduce scald hazards.

Temperature	Time to Produce 2nd & 3rd
Setting	Degree Burns on Adult Skin
180°F / 82°C	Nearly instantaneous
170°F / 77°C	Nearly instantaneous
160°F / 71°C	About 1/2 second
150°F / 66°C	About 1-1/2 seconds
140°F / 60°C	Less than 5 seconds
130°F / 54°C	About 30 seconds
120°F / 49°C	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.

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/94°C.

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/71°C 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.

DISHWASHING MACHINE REQUIREMENT

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 (103 Kpa and 173 Kpa). Flow pressures above 25 pounds per square inch (173 Kpa), or below 15 pounds per square inch (103 Kpa), 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 (82°C) 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

(82°C) 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 (82°C) 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 NFPA 70 or Canadian Code CSAC22.1.

All bronze circulators are recommended for 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

REQUIRED ABILITY

INSTALLATION OR SERVICE OF THIS WATER HEATER REQUIRESABILITY 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 90.1 1999 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" (38 cm) of the water heater, as this will interfere with safe operation.

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•Do not cover the temperature & pressure relief valve. • Devices that will turn off the gas supply to a gas water heater while at the

•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.

LOCATING THE HEATER

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 IGNITER OR MAIN BURNER FLAMES CAUSING FIRE OR EXPLOSION. SOME LOCAL CODES PERMIT OPERATION OF GAS APPLIANCES IF INSTALLED 18 INCHES (46 cm) ORMOREABOVETHEFLOOR.THISMAYREDUCETHERISKIFLOCATION 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 WILLBE OBJECTIONABLE. THIS INCLUDES LOCATIONS CLOSE TO OR ACROSS FROM WINDOWS AND DOORS. AVOID ANCHORING THE VENTAND INTAKE PIPES DIRECTLY TO FRAMED WALLS, FLOORS OF CEILINGS UNLESS RUBBER ISOLATION PIPE HANGERSARE USED. THIS PREVENTS ANY VIBRATIONS FROM BEING TRANSMITTED INTO THE LIVING SPACES.

same time shutting off its water supply.

WARNING

THIS WATER HEATER IS A CONDENSING UNIT AND REQUIRESA 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.

FIGURE 3

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.

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 THEADJACENT AREAOR 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.

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.

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.

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" (61 cm) 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

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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.

less than 100 square inches (645 cm²).

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 (6.5 cm²) 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 (6.5 cm²) 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 CHEMICALVAPORS. 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.

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 HEATER’S 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.

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

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 (31 cm) OF THE

ENCLOSURE TOP AND ONE IN OR WITHIN 12 INCHES (31 cm) OF THE

ENCLOSURE BOTTOM. Each opening shall have a free area of at least one square inch (6.5 cm²) per 1000 Btuh appliances in the enclosure, but not

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.

CAUTION

DO NOT TERMINATE THE VENTING 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 OR CEILINGS UNLESS RUBBER ISOLATION PIPE HANGERS ARE USED. THIS PREVENTS ANY VIBRATIONS FROM BEING

6

DIRECT VENT

		*NOTE: BTH 250 USES TEE ON
		AIR INTAKE TERMINAL
	FIGURE 5	ON DIRECT VENT INSTALLATIONS, EXHAUST VENT
		HOOD MUST BE LOCATED 1' (30.5cm) MINIMUM
DO NOT TERMINATE EXHAUST
		FROM ANY OPENING IN BUILDING.
OVER PUBLIC AREA WHERE
CONDENSATE OR VAPOR CAN	HORIZONTAL VENT
CAUSE NUISANCE OR HAZARD.		ON DIRECT VENT INSTALLATIONS, EXHAUST VENT
		HOOD MUST BE LOCATED 4' (122cm) MINIMUM
		FROM ANY OPENING IN BUILDING.

FIGURE 6

7

TRANSMITTED INTO THE LIVING SPACES.

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/NFPA 54 and for Canadian installations consult the Canadian

Installation Codes and CAN/CGA B149.1 and .2.

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' (30.5 cm) below, 1' (30.5 cm) horizontally from or 1' (30.5 cm) above any door, window, or gravity air inlet into building.

3.For horizontal the venting system, using room for combustion, the vent terminal shall terminate 4' (122 cm) below, 4' (122 cm) horizontally from or 1' (30.5 cm) 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' (91cm) from an inside corner of an L shaped structure. And not less than 1' (30.5 cm) above grade or anticipated snow level.

5.The vent termination shall not be mounted directly above or within 3' (91cm) 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" (30.5 cm) 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.

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" (7.6cm) 45° PVC ELBOW WITH MESH SCREEN

FIGURE 7

WARNING

WHEN THE UNIT IS TO BE SETUPASADIRECT VENT, THE MESH SCREEN MUST BE REMOVED. THE INLET VENT PIPE MAY THEN BE GLUED TO

THE AIR

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.

NOTE: TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULATING TO THE AIR INTAKE IN WINDY/COLD AREAS, THE MAXIMUM PRACTICAL

DISTANCE BETWEEN THESETWOTERMINALS IS RECOMMENDED.

BTH 120

BTH 150 & 199

BTH 250

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FIGURE 9

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" (61cm) from the vertical centerline of the exhaust vent terminal (see Figure 9). In colder climates increasing the 24" (61cm) 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 OFANY VENTPIPE READ THE VENTPIPE 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 1/2" (1.3 cm) 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" PVC pipe about 3.5" (8.9 cm) 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).

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FIGURE 10

FIGURE 11

VERTICAL VENT TERMINAL INSTALLATION

IMPORTANT

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" (61cm).

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.

FIGURE 12

INSTALLATION 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 1/4" (6 mm) 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 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.

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 (15.2 m) of pipe to the exhaust venting arrangement. This addition of FIFTY (50) EQUIVALENT FEET (15.2 m) of pipe on both the intake venting arrangement and exhaust venting arrangement must include any 3" PVC elbows which equals (5) EQUIVALENT FEET (1.5 m) of pipe.

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