A.O. Smith 400A User Manual

CYCLONE XHE® Model BTH 300A AND 400A

Series 970

COMMERCIAL GAS WATER HEATER

GAS-FIREDPOWER BURNER

FOR DOMESTIC HOT WATER

• INSTALLATION • OPERATION • SERVICE • MAINTENANCE • LIMITED WARRANTY

WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death.

–Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

–WHAT TO DO IF YOU SMELL GAS:

•Do not try to light any appliance.

•Do not touch any electrical switch; do not use any phone in your building.

•Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.

•If you cannot reach your gas supplier, call the fire department.

–Installation and service must be performed by a qualified installer, service agency or the gas supplier.

Thank you for buying this energy efficient water heater from A.O. Smith Water Products Company. We appreciate your confidence in our products.

CAUTION

TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION RELATIVE TO YOUR SAFETY. PLEASE READ THOROUGHLY BEFORE INSTALLING AND USING THIS APPLIANCE.

Series 970

A DIVISION OF A.O. SMITH CORPORATION

Mc BEE, SOUTH CAROLINA

STRATFORD (ONTARIO) CANADA www.hotwater.com

PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.

PRINTED IN U.S.A. 0306

PART NO. 197373-000

1

ROUGH-IN-DIMENSIONS

		GAS VALVE PIPING
		BTH-300				1 1/4" NPT
		BTH-400				1 1/4" NPT
TABLE 1 RECOVERY CAPACITIES.
												U.S. Gallons/Hr and Litres/Hr at TEMPERATURE RISE INDICATED
			TYPE OF			INPUT				Approx.	F°	20F°	30F°	40F°	50F°	60F°	70F°	80F°	90F°	100F°	110°	120F°	130F°	140F°
MODEL			GAS			BTUH	KW			Capacity	C°	11C°	17C°	22C°	28C°	33C°	39C°	44C°	50C°	56C°	61C°	67C°	72C°	78C°
BTH-300			NATURAL			300,000			130 US Gals.		GPH	1782	1188	891	713	594	509	445	396	356	324	297	274	255
							88			492 Litres	LPH	6745	4496	3372	2698	2248	1927	1686	1499	1349	1226	1124	1038	964
BTH-300			PROPANE			280,000			130 US Gals.		GPH	1663	1109	832	665	554	475	416	370	333	302	277	256	238
							82			492 Litres	LPH	6295	4197	3148	2518	2098	1799	1574	1399	1259	1145	1049	968	899
BTH-400			NATURAL			400,000			130 US Gals.		GPH	2376	1584	1188	950	792	679	594	528	475	432	396	366	339
							117			492 Litres	LPH	8993	5995	4496	3597	2998	2569	2248	1998	1799	1635	1499	1384	1285
BTH-400			PROPANE			400,000			130 US Gals.		GPH	2376	1584	1188	950	792	679	594	528	475	432	396	366	339
							117			492 Litres	LPH	8993	5995	4496	3597	2998	2569	2248	1998	1799	1635	1499	1384	1285

Recovery capacities are based on heater performance at 98% thermal efficiency.

FOREWORD

These designs comply with the current edition of the American National Standard for Gas Water Heaters, Volume III, ANSI Z21.10.3 / CSA 4.3 as an automatic circulating tank water heater, and automatic storage water heaters.

Detailed installation diagrams are found in this manual. These diagrams will serve to provide the installer with a reference for the materials and methods of piping necessary. It is highly essential that all water, gas piping and wiring be installed as shown on the diagrams.

Particular attention should be given to the installation of thermometers at the locations indicated on the diagrams as these are necessary for checking the proper functioning of the heater.

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 current editions of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and the National Electrical Code, NFPA 70 or CAN/CSA-B149.1,the Natural Gas and Propane Installation Code and CSA C22.1, the Canadian Electrical Code. All documents are available from the Canadian Standards Association, 8501 East Pleasant Valley Road, Cleveland, OH 44131. NFPA documents are also available from the National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02269.

2

TABLE OF CONTENTS

	PAGE
ROUGH-INDIMENSIONS ...................................................................	2
FOREWORD ......................................................................................	2
FEATURES ........................................................................................	3
Water Temperature Control ..........................................................	3-4
High Limit Switch (E.C.O.) ............................................................	4
Dishwashing Machine Requirement ............................................	4
Circulating Pump ...........................................................................	4
INSTALLATION INSTRUCTIONS ........................................................	4
Required Ability ............................................................................	4
Insulation Blankets .......................................................................	4-5
Locating The Heater .....................................................................	5
Clearances ...................................................................................	5
Hard Water ...................................................................................	5
Air Requirements .........................................................................	6
Mechanical Exhausting of Room Air ............................................	6
Unconfined Space ........................................................................	6
Confined Space ............................................................................	6
Chemical Vapor Corrosion ...........................................................	6
VENTING ...........................................................................................	6
Vent Pipe Termination ...................................................................	6
Direct Venting ...............................................................................	7-8
Direct Vent Terminal Installation ...................................................	8
Installation Sequence ...................................................................	8-9
Vertical Vent Terminal Installation ................................................	9
Installation Sequence ...................................................................	9
Installation of Vent System ..........................................................	10
Vent Pipe Preparation ...................................................................	10-11
CONTROLSAND SWITCHES ............................................................	11
Blower Prover Switch .................................................................	11
Blocked Outlet Prover Switch ......................................................	11
Blocked Inlet Prover Switch .........................................................	11
Low Gas Pressure Switch ..........................................................	11
On/Off Switch ..............................................................................	11
Hot Surface Igniter .......................................................................	11
GAS PIPING .......................................................................................	12
Connection of Gas Pipe ...............................................................	12-13
Purging .........................................................................................	13
Gas Meter Size - City Gases Only ..............................................	13
Gas Pressure Regulation .............................................................	13
Gas Valves ...................................................................................	13
SYSTEM CONNECTIONS ..................................................................	13
Thermometers ..............................................................................	13
Relief Valve ..................................................................................	13
Water Line Connections ..............................................................	13

	PAGE
Closed System ................................................................................	13
Water (Potable) Heating & Space Heating ......................................	13
Heater Wiring ..................................................................................	14-15
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
OPERATINGINSTRUCTIONS ................................................................	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
Powered Anode System .................................................................	21-22
Drain Valve and Access Panels .....................................................	22
Relief Valve .....................................................................................	22
Internal 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 THAT A QUALIFIED SERVICE TECHNICIAN PERFORM THE INITIAL FIRING OF THE HEATER. AT THIS TIME THE USER SHOULD NOT HESITATE TO ASK THE TECHNICIAN ANY QUESTIONS WHICH HE MAY HAVE IN REGARD TO THE OPERATION AND MAINTENANCE OF THE UNIT.

A CHECKLIST AND SERVICE INFORMATION section are included at the rear of this manual. By using this checklist the user may be able to make minor operational adjustments and save himself unnecessary service calls. However, the user should not attempt repairs which are not listed in this section.

WATER TEMPERATURE CONTROL

DANGER

THIS WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE THERMOSTAT TO CONTROL WATER TEMPERATURE. HOT WATER TEMPERATURES REQUIRED FOR AUTOMATIC DISHWASHER AND LAUNDRY USE CAN CAUSE SCALD BURNS RESULTING IN SERIOUS PERSONAL INJURY AND/OR DEATH. THE TEMPERATURE AT WHICH INJURY OCCURS VARIES WITH THE PERSON’S AGE AND TIME OF 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.

3

“AT A GLANCE” BTH 300/400 QUICK INSTALLATION TIPS

		Horizontal Sidewall Venting					Vertical Rooftop Venting

4

The temperature may be adjusted from 80°F/27°C to 180°F/82°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, 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.

WATER TEMPERATURE SETPOINT

ADJUSTMENT PROCEDURE

CAUTION

THE TEMPERATURE OF THE WATER AT THE TANK OUTLET MAY NOT CORRESPOND TO THE TEMPERATURE SETPOINT PROGRAMMED IN THE CONTROLLER. THE USER CAN EASILY CHANGE THE TEMPERATURE SETPOINTATANY TIME BY USING THE FOLLOWING PROCEDURE. IN ALL CASES, INPUT POWER MUST BE APPLIED TO THE CONTROLLER TO PERFORM ANY PROGRAMMING OPERATIONS.

To change or view the current programmed temperature setpoint value, utilize the pushbutton on the Display Board. Momentarily pressing the button will briefly illustrate the existing setpoint value. If the button is held down for more than one second, the programming mode is automatically entered and the setpoint value will begin incrementing or decrementing by one degree per second. The control will alternate between between the incrementing or decrementing mode each time the button is pressed. When the desired setpoint value is reached, simply release the button and the controller will automatically retain this value in temporary memory. After one complete heat cycle, the new setpoint is transferred to permanent memory.

Note: If power is interrupted prior to completing one heat cycle, the new setpoint will not be transferred to permanent memory. Therefore, it is a good practice to recheck the setpoint value at the end of a heat cycle after a new value has been entered.

If the button is held down long enough, the setpoint will reach 70°F (the minimum value) and stop. At this point, if the desired setpoint has not been obtained, release the button and depress it again. The setpoint value will now restart at 70°F and once again increase in value for as long as the button is pressed.

Figure 1 shows the approximate time-to-burnrelationship 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 (11C°). 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 1-1/2seconds
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-usetemperature 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 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 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-offto the dishwashing machine. Adjust flow by means of the plug cock in the circulating line. (See installation diagrams.)

5

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 current edition of the National Electrical Code, NFPA70 or the Canadian Electrical 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 REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED TRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR SUPPLY, VENTING, GAS SUPPLY AND ELECTRICAL WORK ARE REQUIRED.

INSULATION BLANKETS

Insulation blankets available to the general public for external use on gas water heaters are not approved for use on your A.O. Smith water heater. The purpose of an insulation blanket is to reduce the standby heat loss encountered with storage tank water heaters. Your A.O. Smith water heater meets or exceeds the ASHRAE/IES 90.1-1999standards 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.

•Do not cover 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 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 TRAVELALONG 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) OR MORE ABOVE THE FLOOR. THIS MAY REDUCE THE RISK IF LOCATION IN SUCH AN AREA CANNOT BE AVOIDED.

THE HEATER SHALL BE LOCATED OR PROTECTED SO IT IS NOT SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.

DO NOT LOCATE THE HEATER WHERE NOISE FROM THE EXHAUST OR INTAKE WILL BE OBJECTIONABLE. THIS INCLUDES LOCATIONS CLOSE TO OR ACROSS FROM WINDOWS AND DOORS. AVOID ANCHORING THE VENT AND INTAKE PIPES DIRECTLY TO FRAMED WALLS, FLOORS OF CEILINGS UNLESS RUBBER ISOLATION PIPE HANGERS ARE USED. THIS PREVENTS ANY VIBRATIONS FROM BEING TRANSMITTED INTO THE LIVING SPACES.

WARNING

FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY OTHER POTENTIAL FIRE HAZARDOUS ARTICLES MUST NEVER BE PLACED ON OR ADJACENT TO THE HEATER. OPEN CONTAINERS OF FLAMMABLE MATERIAL SHOULD NOT BE STORED OR USED IN THE SAME ROOM WITH THE HEATER.

When installing the heater, consideration must be given to proper location. Location selected should be as close to the intake and exhaust termination points as practicable, with adequate air supply and as centralized with the piping system as possible.

THE HEATER MUST NOT BE LOCATED IN AN AREA WHERE IT WILL BE SUBJECT TO FREEZING.

LOCATE IT NEAR A FLOOR DRAIN. THE HEATER SHOULD BE LOCATED IN AN AREA WHERE LEAKAGE FROM THE HEATER OR CONNECTIONS WILL NOT RESULT IN DAMAGE TO THE ADJACENT AREA OR TO LOWER FLOORS OF THE STRUCTURE.

When such locations cannot be avoided, it is recommended that a suitable drain pan, adequately drained, be installed under the appliance.

WARNING

THIS WATER HEATER IS A CONDENSING UNIT AND REQUIRES A DRAIN TO BE LOCATED IN CLOSE PROXIMITY TO ALLOW THE CONDENSATE TO DRAIN SAFELY. THE CONDENSATE DRAINS FROM THE UNIT AT THE EXHAUST ELBOW LOCATED AT THE BOTTOM OF THE UNIT. NOTE: IT IS IMPORTANT THAT THE CONDENSATE HOSE NOT BE ELEVATED ABOVE THE EXHAUST ELBOW (SEE FIGURE 3). THE CONDENSATE BUILDUP WILL BLOCK THE EXHAUST OUTLET, WHICH WILL CAUSE IMPROPER OPERATION.

FIGURE 3.

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.

6

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, thermostats, cleanout openings, drain valves and venting connections.

Always disconnect electrical power before servicing the unit

*ILLUSTRATION OF MINIMUM COMBUSTIBLE CLEARANCES IN AN ALCOVE.

FIGURE 4.

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.

SERIOUS DAMAGE TO THE HEATER AND RISK OF FIRE OR EXPLOSION. IT CANALSO 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 per 1000 Btuh (2,203mm2/kW) appliances in the enclosure, but not 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 per 4000 Btuh (551mm2/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 (1,102mm2/kW) of the total input of all appliances in the enclosure.

AIR REQUIREMENTS

KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE MATERIALS, GASOLINEAND 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 INAYELLOW, LUMINOUS BURNER FLAME, CAUSING CARBONING OR SOOTING OF THE COMBUSTION CHAMBER, BURNERS AND FLUE TUBES AND CREATES A RISK OF ASPHYXIATION.

CHEMICAL VAPOR CORROSION

WARNING

CORROSION OF THE FLUE WAYS AND VENT SYSTEM MAY OCCUR IF AIR FOR COMBUSTION CONTAINS CERTAIN CHEMICAL VAPORS. SUCH CORROSION MAY RESULT IN FAILUREAND 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

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.

7

US DIRECT VENT

CAUTION

TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULATING TO THE AIR INTAKE IN WINDY/COLD AREAS, THE MAXIMUM PRACTICAL DISTANCE BETWEEN THESE TWO TERMINALS IS RECOMMENDED.

CANADIAN DIRECT VENT

FIGURE 5.

8

US HORIZONTAL VENT

CAUTION

TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULATING TO THE AIR INTAKE IN WINDY/COLD AREAS, THE MAXIMUM PRACTICAL DISTANCE BETWEEN THESE TWO TERMINALS IS RECOMMENDED.

CANADIAN HORIZONTAL VENT

FIGURE 6.

9

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 5 and 6 before proceeding.

CAUTION

DO NOT TERMINATE THE VENTING WHERE NOISE FROM THE EXHAUST OR INTAKE WILL BE OBJECTIONABLE. THIS INCLUDES LOCATIONS CLOSE TO ORACROSS FROM WINDOWS AND DOORS. AVOID ANCHORING THE VENT AND INTAKE PIPES DIRECTLY TO FRAMED WALLS, FLOORS OR CEILINGS UNLESS RUBBER ISOLATION PIPE HANGERS ARE USED. THIS PREVENTS ANY VIBRATIONS FROM BEING TRANSMITTED INTO THE LIVING SPACES.

IMPORTANT

The vent system must terminate so that proper clearances are maintained as cited in local codes or the current editions of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 or the Canadian Electrical Code, CSA C22.1.

Do not terminate the exhaust vent terminal over public area where condensate or vapor can cause nuisance or hazard.

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 OFA VENT SYSTEM WITH ADEVICE 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 an intake guard, see Figure 7.

3"x 4" 45° PVC ELBOW WITH INTAKE GUARD

FIGURE 7.

WARNING

WHEN THE UNIT IS TO BE SETUPASADIRECT VENT, THE INTAKE GUARD MUST BE REMOVED. THE INLET VENT PIPE MAY THEN BE GLUED TO THE AIR INTAKE (see Figure 8) PROVIDED ON THE UNIT.

FIGURE 8.

DIRECT VENT TERMINAL INSTALLATION

IMPORTANT

THIS UNIT CONSISTS OF TWO VENT TERMINALS - AN INTAKE VENTTERMINALANDAN EXHAUST VENTTERMINAL. THE INTAKE VENT TERMINAL IS A 3" 45° PVC ELBOW WITH A DOME SHAPE 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/COLDAREAS, THE MAXIMUM PRACTICAL DISTANCE BETWEEN THESE TWO TERMINALS IS RECOMMENDED.

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 to 48" (122cm) will reduce possibility of frost over from side winds blowing exhaust vapors to the air intake of the direct the vent and is recommended for Canada.

10