A. O. Smith GB-300 Installation Manual

COPPER BOILERS

FOR HYDRONIC HEATING

AND HOT WATER SUPPLY

Instruction Manual

GB/GW-300, 400, 500, 650, 750

• Installation

• Operation

• Maintenance

• Limited Warranty

WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

— 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.

SERIES 400, 401, 402, 403, 404, 405

2-STAGE UNITS

for buying this

Thank You

cost efficient, high recovery unit

from A. O. Smith Water Products Company

Please read through this informative manual and pay special attention to the following:

ROUGH-IN DIMENSIONS/CAPACITIES PAGES 2 - 4

"FOREWORD" ON PAGE 5

"FEATURES" ON PAGES 6 - 7

"VENTING" ON PAGES 8 - 12

"GAS CONNECTIONS" 11 - 13

"INSTALLATION INSTRUCTIONS" ON PAGES 5 - 13

"WIRING DIAGRAM/SCHEMATIC" ON PAGES 14 - 15

"LIGHTING AND OPERATING" ON PAGES 19 - 20

"EMC5000 INSTRUCTIONS" ON PAGES 20 - 27

"SYSTEM EQUIPMENT INSTALLATION" PAGES 29 - 33

"TROUBLE SHOOTING" ON PAGES 27 - 28

"GENERAL MAINTENANCE" ON PAGES 34 - 35

"START-UP INSTRUCTIONS" ON PAGES 37 - 38

— Installation and service must be

"LIMITED WARRANTY" ON PAGE 39

performed by a qualified installer, service agency or the gas supplier.

CAUTION

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

PLACE THESE INSTRUCTIONS ADJACENT TO BOILER AND

PRINTED 0809 212130-002

NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.

A DIVISION OF A. O. SMITH CORPORATION

MC BEE, SC., RENTON, WA.,

STRATFORD-ONTARIO, VELDHOVEN-THE NETHERLANDS

www.hotwater.com

FIGURE 2.

FRONT

FIGURE 1.

LEFT SIDE

FIGURE 3.

TOP

TABLE 1A. BASIC GAS AND ELECTRICAL PARAMETERS

MANIFOLD MANIFOLD

MODEL TYPE OF PRESS. PRESS.

GB/GW GAS VOLTS/HZ AMPS Inches W.C. kPa

300 Natural 120/60 20 3.5 0.87 400 Natural 120/60 20 3.5 0.87 500 Natural 120/60 20 3.5 0.87 650 Natural 120/60 20 3.5 0.87 750 Natural 120/60 20 3.5 0.87 300 Propane 120/60 20 10.0 2.49 400 Propane 120/60 20 10.0 2.49 500 Propane 120/60 20 10.0 2.49 650 Propane 120/60 20 10.0 2.49 750 Propane 120/60 20 10.0 2.49

All Models - Maximum Supply Pressure: 14 In. W. C. (03.49 kPa) Minimum Supply Pressure Natural Gas: 4.5 In.W. C. ( 01.22 kPa) Minimum Supply Pressure Propane (LP) Gas: 11.0 In. W. C. ( 02.74 kPa)

FIGURE 4.

REAR

TABLE 1B. ROUGH-IN DIMENSIONS

Model Natural Gas Natural Gas Gas Gas (Inch) (Inch) Size (Inch) (Inch) (Inch) (mm) (inch) (mm) (Inch) (mm) (Inch) mm

Btu/hr. Input KW Input Propane (LP) Propane (LP) Vent Size Inlet Air Connections Piping Width Width A A B B C C

GB/GW 300 300,000 88 300,000 88 5 5 1 1/2 3/4 29 1/2 749 14 13/16 376 9 229 12 305 GB/GW 400 399,900 117 399,900 117 6 6 1 1/2 1 35 3/4 908 17 15/16 456 9 229 14 3/4 375 GB/GW 500 500,000 147 500,000 147 6 6 2 1 42 1067 21 1/16 535 9 229 14 3/4 375 GB/GW 650 650,000 190 650,000 190 8 8 2 1 1/4 51 3/8 1305 25 3/4 654 9 229 14 3/4 375 GB/GW 750 750,000 220 750,000 220 8 8 2 1 1/4 57 5/8 1464 28 7/8 733 9 229 17 1/4 438

Btu/hr.Input KW Input Exhaust Water Gas

FIGURE 7.

LEFT SIDE

FIGURE 5.

REAR

FIGURE 6.

TOP

FIGURE 8.

TABLE 1C. OUTDOOR UNIT DIMENSIONS

FRONT

MODEL NUMBER A B C D E F G1 G2

GBO/GWO-300 3 9 3/4 49 13 5/8 34 5/8 67.88 24 3/16 —

GBO/GWO-400 3 9 3/4 55 1/4 13 5/8 34 5/8 68.88 24 3/16 —

GBO/GWO-500 3 9 3/4 61 1/2 13 5/8 34 5/8 68.88 24 3/16 —

GBO/GWO-650 3 9 3/4 70 7/8 13 5/8 34 5/8 68.63 — 27 11/16

GBO/GWO-750 3 9 3/4 77 1/8 13 5/8 34 5/8 68.63 — 27 11/16

TABLE 2. PUMP PERFORMANCE

Water Flow Rate Head Loss Rise Temp. Pipe Size Pump

Model Category GPM LPM Feet Meter F C (Inch) Taco Models*

GW-300 Normal 17 64 4.4 1.3 30 2.4 1 1/2" 0010

Hard 25 95 9.5 2.9 20 5.3 1 1/2" 0012

GW-400 Normal 23 87 8.0 2.4 30 4.4 1 1/2" 0012

Hard 34 129 6.0 1.8 20 3.3 2" 0012

GW-500 Normal 28 106 4.6 1.4 30 2.6 2" 0012

Hard 42 159 9.1 2.8 20 5.1 2" 1911 (1/4 HP)

GW-650 Normal 37 140 6.2 1.9 30 3.4 2" 0012

Hard 55 208 12.2 3.7 20 6.8 2" 1911 (1/3 HP)

GW-750 Normal 42 159 9.7 3.0 30 5.4 2" 1911 (1/4 HP)

Hard 63 238 18.8 5.7 20 10.4 2" 1935 (1/3 HP)

Pressure drop includes the loss through 50' (15.2M) of pipe and normal fittings, when installed with storage tank.

WATER CATEGORY GRAIN HARDNESS PER GAL.

NORMAL 1 THROUGH 15

HARD OVER 15

* Taco Pumps shown. Equivalent Armstrong, Bell & Gossett or Grundfos are acceptable as long as the

flow rates are maintained. Always ensure adequate support for pump and piping.

TABLE 3. RECOVERY CAPACITIES

TABLE 4. HEAT EXCHANGER PRESSURE DROP

F) Rise 30 (oF) Rise 40 (oF) Rise 10 (oC) Rise 15 (oC) Rise 20 (oC) Rise

20 (

Model PD-Ft. PD-Ft. PD-Ft. PD-Meters PD-Meters PD-Meters

GB Flow GPM Head Flow GPM Head Flow GPM Head Flow LPM Head Flow LPM Head Flow LPM Head 300 25 1.3 17 0.6 13 0.4 95 0.38 64 0.19 49 0.12 400 34 2.2 23 0.9 17 0.6 129 0.67 87 0.28 64 0.20 500 42 3.4 28 1.8 21 0.9 159 1.03 106 0.54 79 0.29 650 55 3.5 37 2.0 27 1.8 208 1.07 140 0.61 102 0.56 750 63 8.3 42 4.3 32 2.1 238 2.53 159 1.31 121 0.64

TEMPERATURE RISE AND PRESSURE DROP

FOREWORD

CAUTION

TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION RELATIVE TO YOUR SAFETY. PLEASE READ COMPLETELY BEFORE USING APPLIANCE.

CAUTION

Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation of the boiler.

"Verify proper operation after servicing."

Detailed installation diagrams are in this manual. These diagrams will provide the installer with a reference of materials needed and a suggested method of piping. IT IS NECESSARY THAT ALL WATER AND GAS PIPING, AND THE ELECTRICAL WIRING BE INSTALLED AND CONNECTED AS SHOWN IN THE DIAGRAMS.

CHECK THE DIAGRAMS THOROUGHLY BEFORE STARTING INSTALLATION TO AVOID POSSIBLE ERRORS AND TO MINIMIZE TIME AND MATERIALS COST. SEE FIGURES 1 THROUGH 4 AND TABLES 1A, 1B AND 1C.

This design complies with the current edition of ANSI Z21.13 CSA 4.9 for Gas-Fired Low-Pressure Steam and Hot Water Boilers.

MAKE SURE THE GAS ON WHICH THE BOILER WILL OPERATE IS THE SAME AS THAT SPECIFIED ON THE BOILER RATING PLATE.

The boiler installation must conform to these instructions and the requirements of the local authority having jurisdiction.

In the absence of local code requirements, the installation must conform to the National Fuel Gas Code, ANSI Z223.1 or CAN/ CSA-B149.1-00 (current edition).

These manuals can be purchased from the Canadian Standards Association, 8501 East Pleasant Valley Road, Cleveland, OH 44131 .

REPLACEMENT PARTS

Replacement parts may be ordered through A. O. Smith dealers, authorized servicers or distributors. Refer to the Yellow Pages for where to call or contact (in United States) the A. O. Smith Water Products Company, 500 Tennessee Waltz Parkway, Ashland City, TN 37015, 1-800-433-2545 or (in Canada) A. O. Smith Enterprises Ltd., 768 Erie Street, Stratford, Ontario, Canada N5A 6T3, 800-265-8520. When ordering parts be sure to state the quantity, part number and description of the item including the complete model and serial number as it appears on the product. Refer to the parts lists for more information.

INSTALLATION CLEARANCES

Sufficient area should be provided at the front (2 feet minimum) and at the water connection side (1 foot minimum) of the unit for proper servicing. Sufficient clearance should be provided at

the return header side of the boiler to permit access to heat exchanger tubes for cleaning. In a utility room installation, the door shall be wide enough to allow the boiler to enter or to permit the replacement of another appliance.

These boilers are approved for installation on noncombustible flooring in an alcove with minimum clearance to combustibles of:

3 inches sides, and back; 3 inches top, front alcove, 6 inches vent.

For installation on combustible flooring use the Combustible Floor Kit. The combustible floor kit base adds 4" to the overall height of the boiler, see Figure 9.

FIGURE 9. BOILER ON COMBUSTIBLE FLOOR BASE

Model Combustible Floor Kit (GB/GW)-300 210202-001 (GB/GW)-400 210202-002 (GB/GW)-500 210202-003 (GB/GW)-650 210202-004 (GB/GW)-750 210202-005

Two inch clearance is required from combustible construction to hot water pipes.

LEVELLING

For Technical Assistance call A. O. Smith Technical Information Center at 1-800-527-1953.

WARNING

THE WATER MANIFOLD IS NOT DESIGNED TO SUPPORT THE WEIGHT OF THE WATER PIPING SYSTEM. AS ON ALL BOILER INSTALLATIONS, SPECIAL CARE MUST BE TAKEN TO ENSURE PROPER SUPPORT.

WARNING

UNDER NO CIRCUMSTANCES SHOULD THE EQUIPMENT ROOM WHERE THE BOILER IS INSTALLED EVER BE UNDER NEGATIVE PRESSURE. PARTICULAR CARE MUST BE TAKEN WHEN EXHAUST FANS, COMPRESSORS, AIR HANDLING EQUIPMENT, ETC., MAY INTERFERE WITH THE COMBUSTION AND VENTILATION AIR SUPPLIES OF THIS BOILER.

Each unit must be checked after installation to be certain that it is level.

CONDENSATION WARNING

Your boiler is not designed to operate with a boiler inlet water temperature of less than 120°F (38°C). Colder inlet water temperatures will result in significant condensation developing on the heat exchanger. This situation can cause a corrosive environment for the heat exchanger, burners and venting resulting in premature damage, which could result in serious personal injury or death. Damage caused by excessive condensation will not be covered under the limited warranty.

For systems that use large volumes of cold water or systems utilizing heavy water draws, condensation can be prevented by using a bypass loop.

FEATURES

IMPORTANT

Only qualified personnel shall perform the initial firing of the heater. At this time the user should not hesitate to ask the start-up technician any questions regarding the operation and maintenance of the unit.

Lighting and Operating instructions are included with this manual. By using these instructions, the user may be able to make minor operational adjustments and save unnecessary service calls. However, the user should not attempt repairs, but should contact a service technician or gas supplier.

The T & P relief valve should have a temperature rating of 210°F, a pressure rating NOT exceeding the lowest rated working pressure of any system component, and a discharge capacity exceeding the total input of the water boilers supplying water to the storage tank.

Locate the T & P relief valve (a) in the top of the tank, or (b) in the side of the tank on a center line within the upper six (6) inches of the top of the tank, see Figure 20 and 22. The tapping shall be threaded in accordance with the latest edition of the Standard for Pipe Threads, General Purpose (inch), ANSI/ASME B1.20.1. The location of, or intended location for, the T & P relief valve shall be readily accessible for servicing or replacement.

SAFETY RELIEF VALVES

Your local code authority may have other specific relief valve requirements not covered below.

WARNING

THE PURPOSE OF A SAFETY RELIEF VALVE IS TO AVOID EXCESSIVE PRESSURE WHICH MAY CAUSE TANK EXPLOSION, SYSTEM OR BOILER DAMAGE.

TO AVOID WATER DAMAGE A DRAIN LINE MUST BE CONNECTED TO A SAFETY RELIEF VALVE TO DIRECT DISCHARGE TO A SAFE LOCATION. A DRAIN LINE MUST NOT BE REDUCED FROM THE SIZE OF THE VALVE OUTLET AND IT MUST NOT CONTAIN ANY VALVES BETWEEN THE BOILER AND THE RELIEF VALVE OR THE RELIEF VALVE AND THE DRAIN EXIT. IN ADDITION, THERE SHOULD NOT BE ANY RESTRICTIONS IN A DRAIN LINE NOR SHOULD IT BE ROUTED THROUGH AREAS WHERE FREEZING CONDITIONS MIGHT OCCUR. DO NOT THREAD OR CAP THE DRAIN LINE EXIT. RESTRICTING OR BLOCKING A DRAIN LINE WILL DEFEAT THE PURPOSE OF THE RELIEF VALVE AND MAY CREATE AN UNSAFE CONDITION. INSTALL A DRAIN LINE WITH A DOWNWARD SLOPE SUCH THAT IT NATURALLY DRAINS ITSELF.

If any safety relief valve is replaced, the replacement valve must comply with the latest version of the ASME Boiler and Pressure Vessel Code, Section IV (HEATING BOILERS). Select a relief valve with a discharge rating NOT less than the boiler input, and a set pressure NOT exceeding the working pressure of any component in the system.

The storage tank temperature and pressure relief valve must comply with the applicable construction provisions of the Standard for Relief Valves for Hot Water Supply Systems, ANSI Z21.22 CSA 4.4 (current edition). The valve must be of the automatic reset type and not embody a single-use type fusible plug, cartridge or linkage.

FOR HOT WATER HEATING SYSTEMS, the boilers are shipped with a 50 psi pressure relief valve. This relief valve is factory installed in the water outlet header of the boiler, see Figure 1.

FOR HOT WATER SUPPLY SYSTEMS, the boilers are shipped with a 125 psi pressure relief valve. This relief valve is factory installed in the water outlet header of the boiler, see Figure 1.

This ASME-rated valve has a discharge capacity that exceeds the maximum boiler input rating and a pressure rating that does not exceed the maximum working pressure shown on the boiler rating plate.

In addition, a CSA design-certified and ASME-rated temperature and pressure (T & P) relief valve must be installed on each and every water storage tank in the hot water supply system.

INSTALLATION INSTRUCTIONS

REQUIRED ABILITY

INSTALLATION OR SERVICE OF THIS BOILER REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED TRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR SUPPLY, VENTING, GAS SUPPLY AND ELECTRICAL WORK ARE REQUIRED.

LOCATION

When installing the boiler, consideration must be given to proper location. Location selected should be as close to the stack or chimney as practical with adequate air supply and as centralized with the piping system as possible. This location should also be such that the gas ignition system components are protected from water (dripping, spraying, etc.) during appliance operation and service [circulator replacement, control replacement, etc.].

• THE BOILER MUST NOT BE INSTALLED ON CARPETING.

• THE BOILER SHOULD NOT BE LOCATED IN AN AREA WHERE IT WILL BE SUBJECT TO FREEZING.

• THE BOILER SHOULD BE LOCATED NEAR A FLOOR DRAIN.

• THE BOILER SHOULD BE LOCATED IN AN AREA WHERE LEAKAGE FROM THE BOILER OR CONNECTIONS WILL NOT RESULT IN DAMAGE TO THE ADJACENT AREA OR TO LOWER FLOORS OF THE STRUCTURE.

WHEN SUCH LOCATIONS CANNOT BE AVOIDED, A SUITABLE DRAIN PAN SHOULD BE INSTALLED UNDER THE BOILER. Such pans should be fabricated with sides at least 2-1/2" deep, with length and width at least 2" greater than the dimensions of the boiler plus piping connections and must be piped to an adequate drain. The pan must not restrict combustion air flow.

WARNING

THERE IS A RISK IN USING FUEL BURNING APPLIANCES IN ROOMS OR 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 IGNITER OR MAIN BURNER FLAMES CAUSING FIRE OR EXPLOSION. SOME LOCAL CODES PERMIT OPERATION OF GAS APPLIANCES IF INSTALLED 18 INCHES OR MORE ABOVE THE FLOOR. THIS MAY REDUCE THE RISK IF LOCATION IN SUCH AN AREA CANNOT BE AVOIDED.

FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY OTHER POTENTIAL FIRE HAZARDOUS ARTICLES MUST NEVER BE PLACED ON OR ADJACENT TO THE BOILER.

OPEN CONTAINERS OF FLAMMABLE MATERIAL SHOULD NOT BE STORED OR USED IN THE SAME ROOM WITH THE BOILER.

If the boiler is installed above the level of heating system terminal units, a low water cutoff device must be installed in the boiler outlet at the time of installation.

CHEMICAL VAPOR CORROSION

Heat exchanger corrosion and component failure can be caused by the heating and breakdown of airborne chemical vapors. 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 corrosive. These materials are corrosive at very low concentration levels with little or no odor to reveal their presence.

Products of this sort should not be stored near the boiler. Also, air which is brought in contact with the water boiler should not contain any of these chemicals. If necessary, uncontaminated air should be obtained from remote or outside sources.

MANUAL RESET HIGH TEMPERATURE LIMIT CONTROL

This device prevents the water temperature from reaching 250°F. This device is located in the outlet temperature probe.

AUTOMATIC RESET

HIGH TEMPERATURE LIMIT CONTROL

CAUTION

LIMIT CONTROLS ARE NOT TO BE USED AS A THERMOSTAT.

This device prevents the outlet water temperature from reaching the setpoint. Its operation is based on the feedback from the outlet temperature probe. If the temperature exceeds the setpoint, a fault is declared and the gas is shut off. The fault condition is automatically cleared when the temperature drops below the high limit setpoint minus the high limit differential. The factory preset values (and the default high limit values) are 210°F for GW models and 230°F for GB models. The user can adjust these values between 90°F and 210°F for the GW models and 90°F and 235°F for the GB models. The factory preset value (and the default high limit differential value) for both models is 20°F. The user adjustable range is 1°F to 50°F.

TANK PROBE/INLET PROBE

FOR HOT WATER SUPPLY SYSTEMS (GW models), A tank probe

is supplied with each hot water supply boiler. When a tank probe is connected to the system, the tank section on the UIM temperature screen will display a temperature instead of dashes.

continuous operation). GB models require a field supplied operating control be installed in the system. Such as: loop stat, indoor/outdoor reset control, sequencing panel, or energy management system. These types of controls connect to the thermostat wires in the junction box on the boiler. Do not operate

this boiler using the internal high limits only, you must use an operating stat as mentioned above.

CIRCULATING PUMP

The pump flow rate should not exceed the maximum recommended flow rate, see Table 2.

FOR HOT WATER SUPPLY SYSTEMS (GW models), the circulating pump is an integral part of the Boiler, see Figure 3. This pump has been lubricated at the factory, and future lubrication should be in accordance with the motor manufacturer's instructions provided as supplement to this manual.

FOR HOT WATER HEATING SYSTEMS (GB models), the circulating pump is NOT provided and must be field-installed.

SAFETY FLOW SWITCH (Supplied)

The safety flow switch is a safety device which is installed at the water outlet of the unit to prevent main burner operation in the event of inadequate water flow through the boiler.

This switch is connected to the CCB, and its status is displayed on the "System Status" screen. An asterisk indicates switch closure (water flowing).

LOW WATER CUTOFF (OPTIONAL)

If low water protection is required by the authorities having jurisdiction, a low water cutoff switch should be installed next to the boiler in the outlet water line as shown in Figure 23. To meet code requirements the power connections for this switch can be connected to the LWCO connections on the CCB, but the independent contacts for feedback should not be. They should be connected in series with the ECO. When connected in this manner, the LWCO dipswitch on the CCB should be off. The system will not recognize a low water fault condition as a LWCO fault. It will respond with an ECO fault. The switch should receive periodic (every six months) inspection to assure proper operation. A low water cutoff device of the float type should be flushed every six months. If a LWCO is desired, but not required by code, it can be connected to the LWCO connections on the CCB and the dipswitch should be turned to on. The system will then recognize a low water fault condition as LWCO fault.

DRAIN VALVE (Not Supplied)

"Pigtails" of field-supplied wires should be spliced to "pigtails" of tank probe and to "pigtails" at the junction box. See Figure 21 for the tank probe installation. Operating control of the system will be transferred to the tank probe when "Tank Cont" is selected on dip switch #3 off "SW1" on the CCB.

In the absence of tank probe, the inlet probe can be used for boiler stage control. Staging control will be transferred to inlet probe when "Inlet" is selected on dip switch #3 on CCB. Make sure to set the boiler pump for continuous operation.

FOR HOT WATER HEATING SYSTEMS (GB models) Due to the various types of systems and operating conditions, no factory operating control is supplied with the GB models. If no probe is attached to the system, then the dip switch on the CCB should be set to inlet control (and make sure that boiler pump is set for

Drain valves must be obtained and installed on each boiler and tank for draining purposes.

AIR REQUIREMENTS

WARNING

FOR SAFE OPERATION, AN AMPLE SUPPLY OF AIR MUST BE PROVIDED FOR PROPER COMBUSTION AND VENTILATION IN ACCORDANCE WITH THE NATIONAL FUEL GAS CODE, ANSI Z223.1 OR CAN/CSA-B149.1 (CURRENT EDITIONS) OR APPLICABLE PROVISIONS OF THE LOCAL BUILDING CODES. AN INSUFFICIENT SUPPLY OF AIR MAY RESULT IN A YELLOW, LUMINOUS BURNER FLAME, CARBONING OR SOOTING OF THE FINNED HEAT EXCHANGER, OR CREATE A RISK OF ASPHYXIATION. DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILATION AIR.

UNCONFINED SPACE

In buildings of conventional frame, brick or stone construction, unconfined spaces may provide adequate air for combustion.

If the unconfined space is within a building of tight construction (buildings using the following construction: weather stripping, heavy insulation, caulking, vapor barrier, etc.), air for combustion, ventilation, must be obtained from outdoors or spaces freely communicating with the outdoors. The installation instructions for confined spaces in tightly constructed buildings must be followed to ensure adequate air supply.

CONFINED SPACE

(a) U. S. INSTALLATIONS When drawing combustion and dilution air from inside a conventionally constructed building to a confined space, such a space shall be provided with two permanent openings, ONE WITHIN 12 INCHES OF THE ENCLOSURE TOP AND ONE WITHIN 12 INCHES OF THE ENCLOSURE BOTTOM. Each opening shall have a free area of at least one square inch per 1000 Btuh of the total input of all appliances in the enclosure, but not less than 100 square inches.

If the confined space is within a building of tight construction, air for combustion, ventilation, and draft hood dilution must be obtained from outdoors. When directly communicating with the outdoors or communicating with the outdoors through vertical ducts, two permanent openings, located in the above manner, shall be provided. Each opening shall have a free area of not less than one square inch per 4000 Btuh of the total input of all appliances in the enclosure. If horizontal ducts are used, each opening shall have a free area of not less than one square inch per 2000 Btuh of the total input of all appliances in the enclosure.

(b) CANADIAN INSTALLATIONS Ventilation of the space occupied by the boiler(s) shall be provided by an opening for ventilation air at the highest practical point communicating with outdoors. The total cross-sectional area shall be at least 10% of the area of the combustion air opening but in no case shall the cross-sectional area be less than 10 square inches (6500 mm

In addition to the above, there shall be permanent air supply opening(s) having a cross-sectional area of not less than 1 square inch per 7,000 BTUH (310 mm

plus 1 square inch per 14,000 BTU in excess of 1,000,000

BTUH BTUH. This opening(s) shall be located at, or ducted to, a point neither more than 18" (450 mm) nor less than 6 inches (150 mm) above the floor level.

Where power vented equipment is used in the same room as the boiler, sufficient air openings must be supplied.

UNDERSIZED OPENINGS MAY RESULT IN INSUFFICIENT AIR FOR COMBUSTION.

Where an exhaust fan is installed in the same room with a boiler, sufficient openings for air must be provided in the walls. UNDERSIZED OPENINGS WILL CAUSE AIR TO BE DRAWN INTO THE ROOM THROUGH THE CHIMNEY, CAUSING POOR COMBUSTION. SOOTING MAY RESULT WITH AN INCREASED RISK OF ASPHYXIATION.

/KW) up to and including 1,000,000

This boiler is approved to be vented as a Category I, Category III (horizontal venting), or a Direct Vent appliance. The Horizontal and Direct Venting options require a special vent kit.

TABLE 5.

Horizontal Vent or

Horizontal Direct Vent Kit Model Number

210320-001 G(W,B) 300 210320-002 G(W,B) 400

210320-002 G(W,B) 500 210320-003 G(W,B) 650 210320-003 G(W,B) 750

Vertical Direct Vent Kit Model Number

210317-001 G(W,B) 300 210317-002 G(W,B) 400 210317-002 G(W,B) 500 210317-003 G(W,B) 650 210317-003 G(W,B) 750

CAUTION

When venting the Genesis Boiler through oversize chimney (including masonry chimneys), additional care must be exercised to assure proper draft. For proper operation, a minimum draft of -0.02" w.c. and a maximum draft of -0.04" w.c. must be maintained. In instances of excessive draft, a barometric damper may be required to assist in maintaining the proper draft. Draft should be measured 2 feet above the boiler vent collar. The vent system must not have external runs greater than that allowed by local codes or the National Fuel Gas Code.

WARNING

THE INSTRUCTIONS IN THIS SECTION ON VENTING THE BOILER MUST BE FOLLOWED TO AVOID CHOKED COMBUSTION OR RECIRCULATION OF FLUE GASES. SUCH CONDITIONS CAUSE SOOTING OR RISKS OF FIRE AND ASPHYXIATION.

STANDARD (VERTICAL) VENTING, CATEGORY I

THIS BOILER MAY BE VENTED ACCORDING TO TABLE 5A AND 5C (ALSO SEE FIGURE 6). AT LEAST TYPE B VENTING MUST BE USED WITH THE STANDARD VENTING OPTION (thru-the-roof) USING THE NATIONAL FUEL GAS CODE VENT TABLES.* TYPE B VENT PIPE CANNOT BE USED IF THE BOILER IS VENTED HORIZONTALLY (SEE PAGES 10 AND 11). ALL LOCAL UTILITY, STATE/PROVINCIAL, REGULATIONS ON VENTING MUST BE FOLLOWED.

VENT SIZING, INSTALLATION AND TERMINATION SHALL BE IN ACCORDANCE WITH THE NATIONAL FUEL GAS CODE, ANSI Z223.1 OR CAN/CSA-B149.1 (CURRENT EDITIONS).

VENT CONNECTION

Model Number Vent Connector

G(W,B) 300 5" G(W,B) 400 6"

G(W,B) 500 6" G(W,B) 650 8" G(W,B) 750 8"

* For vent arrangements other than Table 5A and for proper boiler

operation, a barometric damper is required to maintain draft between

-0.02" w.c. and -0.04" w.c at 2 feet above the boiler vent collar.

VENTING THE BOILER

All boiler venting systems shall be installed in accordance with the National Fuel Gas Code, ANSI Z223.1 or CAN/CSA-B149.1 (current edition), or applicable provisions of the local building codes.

FIGURE 10. SINGLE PIPE VERTICAL TERMINATION

Vent connections must be made to an adequate stack or chimney and shall be in accordance with the

National Fuel Gas Code, ANSI Z223.1 or CAN/CSA-B149.1 applicable provisions of the local building codes. Size and install proper size vent pipe.

Horizontal runs of vent pipe shall be securely supported by adequately placed (approximately every 4 feet), noncombustible hangers suitable for the weight and design of the materials employed to prevent sagging and to maintain a minimum upward slope of 1/4" per foot from the boiler to the vent terminals. Dampers or other obstructions must not be installed in the vent. Be sure that the vent connector does not extend beyond the inside wall of the chimney.

CONNECTING BOILER TO A COMMON VENT

CAUTION

When the GENESIS boilers are commonly vented, additional care must be exercised to assure proper draft. For proper operation, a minimum draft of -0.02" w

-0.04" w.c. must be maintained AT EACH INDIVIDUAL BOILER. In instances of excessive draft, a barometric damper may be required to assist in maintaining the proper draft. Draft should be measured 2 feet above EACH boiler vent collar.

Do not connect the boiler to a common vent or chimney with solid fuel burning equipment. This practice is prohibited by most local building codes as is the practice of venting gas fired equipment to the duct work of ventilation systems.

Where a separate vent connection is not available and the vent pipe from the boiler must be connected to a common vent with an oil burning furnace, the vent pipe should enter the common vent or chimney at a point ABOVE the flue pipe from the oil furnace.

UL/ULC listed double wall type B-1 gas vents, through 8" diameter, can be installed in heated and unheated areas and can pass through floors, ceilings, partitions, walls and roofs, provided the required clearance is observed.

At the time of removal of an existing boiler, the following steps shall be followed with each appliance remaining connected to the common venting system. Perform these steps while the other appliances remaining connected to the common venting system are not in operation.

Seal any unused openings in the common venting system.

Visually inspect the venting system for proper size and horizontal pitch and determine there is not blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.

.c. and a maximum draft of

SINGLE PIPE HORIZONT

AL VENTING

Vent sizing, installation and termination shall be in accordance with the NATIONAL FUEL GAS CODE, ANSI Z223.1 OR CAN/CSAB149.1. If applicable, all local, utility

, state/provincial regulations on venting must be followed. This boiler may be vented according to Table 5A and 5C. The exhaust vent pipe must be "Saf-T-Vent" manufactured by Heat-Fab Inc. The exhaust vent material type is AL 29-4C. This vent system must be 100% sealed with a condensate trap located as close to the boiler as possible.

FIGURE 11. SINGLE PIPE HORIZONTAL TERMINATION

TABLE 5A. SINGLE PIPE HORIZONTAL AND VERTICAL VENTING

MODEL EXHAUST VENT*

GB/GW-300 110' GB/GW-400 50' GB/GW-500 50' GB/GW-650 50' GB/GW-750 50'

* When sizing exhaust piping and intake air piping, 90-degree elbows

are equivalent to 5 feet of straight pipe and 45-degree elbows are equal to 3 feet of straight pipe.

Intake/Exhaust Installation Requirements:

1. The termination must be a minimum of 12 inches above

anticipated snow or grade level whichever is higher.

2. Due to normal formation of water vapor in the combustion process,

horizontal terminations must not be located over areas of pedestrian or vehicular traffic, (e.g., public walkways or over areas where condensate could create a nuisance or hazard. This is especially true in colder climates where ice buildup is likely to occur. A.O. Smith Corporation will not be held liable for any personal injury or property damage due to any dislodging of ice.

3. The minimum distance from the exhaust terminal to any

window, gravity air inlet to a building, or from gas or electric meter(s) is 6 feet horizontally, 4 feet below and 2 feet above.

4. The minimum distance from the exhaust terminal to an

inside corner formed by two exterior walls is 6 feet but 10 feet is recommended where possible.

5. Maintain a minimum distance of 4 feet from any soffit or

eave vent to the exhaust terminal.

6. Maintain a minimum distance of 10 feet from any forced air

inlet to a building. Any fresh air or make up air inlet such as a dryer or furnace area is considered to be a forced air inlet.

7. Avoid areas where condensate drainage may cause problems

such as above planters, patios, or adjacent to windows where the steam from the flue gases may cause fogging.

8. Select the point of wall penetration where the minimum 1/4" per foot of slope up can be maintained.

9. The through the wall termination kit is suitable for zero clearance to combustible materials.

10.The mid point of the exhaust and intake air termination elbows must be a minimum of 12 inches from the exterior wall.

DIRECT VENT HORIZONTAL AND VERTICAL VENTING

Vent sizing, installation and termination shall be in accordance with the CSA-B149.1 (CURRENT EDITIONS). If applicable, all local, utility, state/provincial regulations on venting must be followed. This boiler may be vented according to Table 5B and 5C. The exhaust vent pipe must be "Saf-T-Vent" manufactured by Heat-Fab Inc. The exhaust vent material type is AL 29-4C. This vent system must be 100% sealed with a condensate trap located as close to the boiler as possible.

The intake air piping can be PVC, CPVC, ABS or any suitable intake air piping that can be sealed.

TABLE 5B. DIRECT VENT HORIZONTAL AND VERTICAL VENTING

* When sizing exhaust piping and intake air piping, 90-degree elbows

Intake/Exhaust Installation Requirements:

1. The exhaust and intake air termination must be a minimum

2. Due to normal formation of water vapor in the combustion

3. The minimum distance from the exhaust terminal to any

4. The minimum distance from the exhaust terminal to an inside

5. Maintain a minimum distance of 4 feet from any soffit or eave

6. Maintain a minimum distance of 10 feet from any forced air

7. Avoid areas where condensate drainage may cause problems

8. Select the point of wall penetration where the minimum 1/4"

9. The through the wall termination kit is suitable for zero

10.The mid point of the exhaust and intake air termination elbows

NATIONAL FUEL GAS CODE, ANSI Z223.1 OR CAN/

MODEL INTAKE* EXHAUST*

GB/GW-300 60' 60' GB/GW-400 35' 35' GB/GW-500 35' 35' GB/GW-650 35' 35' GB/GW-750 35' 35'

are equivalent to 5 feet of straight pipe and 45-degree elbows are equal to 3 feet of straight pipe.

of 12 inches above anticipated snow or grade level which ever is higher, see Figure 14.

process, horizontal terminations must not be located over areas of pedestrian or vehicular traffic, (e.g. public walkways or over areas where condensate could create a nuisance or hazard). This is especially true in colder climates where ice buildup is likely to occur. A.O. Smith Corporation will not be held liable for any personal injury or property damage due to any dislodging of ice.

window, gravity air inlet to a building, or from gas or electric meter(s) is 6 feet horizontally, 4 feet below and 2 feet above.

corner formed by two exterior walls is 6 feet but 10 feet is recommended where possible.

vent to the exhaust terminal.

inlet to a building. Any fresh air or make up air inlet such as a dryer or furnace area is considered to be a forced air inlet.

such as above planters, patios, or adjacent to windows where the steam from the flue gases may cause fogging.

per foot of slope up can be maintained.

clearance to combustible materials.

must be a minimum of 12 inches from the exterior wall.

Direct venting into dead air

CAUTION

spaces such as alleys, atriums and inside corners can cause recirculation of flue gases. Recirculation of flue gases will cause sooting, premature failure of the heat exchanger and icing of the combustion air intake during severe cold weather. To prevent the recirculation of flue gases, maintain as much distance as possible between the combustion air intake and the exhaust vent terminal.

FIGURE 12. DIRECT VENT HORIZONTAL TERMINATION AND

MINIMUM CLEARANCES

FIGURE 13. DIRECT VENT HORIZONTAL/VERTICAL TERMINATION

FIGURE 14. DIRECT VENT VERTICAL/HORIZONTAL TERMINATION

FIGURE 15. DIRECT VENT VERTICAL TERMINATION AND

MINIMUM CLEARANCES

TABLE 5C. INTAKE/VENTING CONFIGURATIONS, CATEGORIES AND MATERIALS

Source for Combustion Exhaust Venting Venting Category Approved Venting Combustion Air

Air Supply Configuration Material Required Intake Material

Boiler Room Air (Using Vertical Natural Draft Category I (Requires a single-acting, Required

combustion air from within listed barometric damper if vent

the building.) length exceeds Table 5A.)

Direct Venting (Outside Vertical Direct Venting Category I AL29-4C Stainless Steel PVC, ABS, CPVC**

combustion air thru sealed Vent Pipe**

pipe to boiler intake.) Horizontal Direct Category III AL29-4C Stainless Steel PVC, ABS, CPVC**

Ducted Air*** (Using Type B Vent Pipe*

combustion air from outside Vertical Natural Draft Category I (Requires a single-acting, PVC, ABS, CPVC,

the building ducted listed barometric damper if vent Galvanized Metal Duct

to boiler intake.) length exceeds Table 5A.) Pipe**

NOTES: * A standard list type B vent terminal as supplied by the vent pipe manufacturer may be used.

** Vent cap/vent terminations and combustion air intake terminations must be furnished by the boiler manufacturer in accordance with

CSA requirements. windy conditions and premature boiler failure.

*** Cannot be used in rooms with negative pressure.

Horizontal/Sidewall Category III AL29-4C Stainless Steel None

Venting Vent Pipe** Required

Venting Vent Pipe**

No substitutions; unapproved substitutions may/will result in dangerous conditions, nuisance lockouts during

Type B Vent Pipe* None

FLUE BOX INSTALLATION

This boiler can be vented and/or bring in fresh air through the rear of the cabinet with the use of the FLUE BOX and vent adaptor. Any of the previous venting configurations can be installed with rear connections.

FIGURE 16. STANDARD INSTALLATION

FIGURE 17. REAR VENT INSTALLATION

To change the unit to rear exhaust:

1. REFER TO THE PSD PARTS LIST, PART NO. 212131-000, AND

ORDER THE "FLUE BOX INSULATION" (211909-007 FOR THE

-300 MODEL; 211909-008 FOR THE 400 & 500 MODEL/ 211909-009 FOR THE 650 & 750 MODEL). THIS PART MUST BE IN HAND BEFORE PROCEEDING TO STEP 2.

2. Remove the vent collar, vent collar gasket, jacket top (from the top) and remove the cover plate and cover plate gasket (from the rear).

3. Remove as thoroughly as possible the fluebox insulation on top of the fluebox. REPLACE this part by applying hightemperature spray adhesive on the newly ordered part and adhering to the top of the fluebox.

4. Reinstall the jacket top and attach the cover plate (along with its gasket).

5. CAREFULLY cut the exhaust hole through the exposed fluebox insulation on the back of the fluebox. Dispose of the cut round piece of insulation.

6. Place the vent collar in alignment with the newly-cut exhaust hole and drill screw holes through the fluebox, using the vent collar as a template. Secure in place (along with its gasket) with the existing sheet metal screws.

To change the unit to rear intake air:

1. The vent collar (for intake air) and the cover plate (for intake air) must be switched. Insure all sheet metal screws are back in place.

GAS CONNECTIONS

WARNING

THIS BOILER IS NOT INTENDED TO OPERATE AT GAS SUPPLY PRESSURE OTHER THAN SHOWN ON THE RATING PLATE. A LOCK-UP OR POSITIVE SHUT-OFF TYPE REGULATOR MUST BE INSTALLED IN THE GAS SUPPLY LINE. EXPOSURE TO HIGHER GAS SUPPLY PRESSURE MAY CAUSE DAMAGE TO GAS VALVES WHICH CAN RESULT IN FIRE OR EXPLOSION. IF OVERPRESSURE HAS OCCURRED SUCH AS THROUGH IMPROPER TESTING OF GAS LINES OR EMERGENCY MALFUNCTION OF THE SUPPLY SYSTEM, THE GAS VALVES 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 BOILER. VENT BLOCKAGE MAY OCCUR DURING ICE BUILD-UP OR SNOW STORMS.

WHEN LOCAL CODES REQUIRE A MAIN MANUAL SHUT-OFF VALVE OUTSIDE THE BOILER JACKET, A SUITABLE MAIN MANUAL SHUT-OFF VALVE MUST BE INSTALLED IN A LOCATION COMPLYING WITH THOSE CODES.

IT IS IMPORTANT TO GUARD AGAINST GAS VALVE FOULING FROM CONTAMINANTS IN THE GAS WAYS. SUCH FOULING MAY CAUSE IMPROPER OPERATION, FIRE OR EXPLOSION. IF COPPER SUPPLY LINES ARE USED THEY MUST BE APPROVED FOR GAS SERVICE.

BEFORE ATTACHING THE GAS LINE BE SURE THAT ALL GAS PIPE IS CLEAN ON THE INSIDE.

FIGURE 18. VENT TERMINATIONS AND INSTALLATION CLEARANCES

TABLE 6. SINGLE UNIT INSTALLATION, SUGGESTED PIPE SIZE

Maximum Equivalent Pipe Length

Natural Gas 1,000 BTU/FT

Propane Gas 2,500 BTU/FT

BTUH 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2"

Input N P N P N P N P N P N P 300,000 15 25 35 85 150 380 360 - - - - 399,900 - 15 25 60 100 260 250 - - - - 500,000 - 10 15 35 65 150 130 360 500 - - 650,000 - - 10 25 45 100 95 250 340 - - 750,000 - - - 20 35 80 75 180 260 600 - -

0.60 Specific Gravity @ 0.5 In. W.C. Pressure Drop

1.53 Specific Gravity @ 0.60 In.W.C. Pressure Drop

TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS SUPPLY LINE, A DIRT LEG (SOMETIMES CALLED DRIP LEG) MUST BE INCORPORATED IN THE PIPING. The dirt leg must be readily accessible and not subject to freezing conditions. INSTALL IN ACCORDANCE WITH RECOMMENDATIONS OF SERVING GAS SUPPLIERS. REFER TO NATIONAL FUEL GAS CODE, ANSI Z223.1 OR CAN/CSA-B149.1 (CURRENT EDITION).

To prevent damage, care must be taken not to apply too much torque when attaching gas supply pipe to gas valve gas inlet.

Fittings and unions in the gas line must be metal to metal type.

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.

THE BOILER MUST BE ISOLATED FROM THE GAS SUPPLY PIPING SYSTEM BY CLOSING ITS MAIN MANUAL GAS SHUTOFF VALVE DURING ANY PRESSURE TESTING OF THE GAS SUPPLY PIPING SYSTEM AT TEST PRESSURES EQUAL TO OR MORE THAN 1/2 PSIG.

PURGING

Gas line purging is required with new piping or systems in which air has entered.

CAUTION

PURGING SHOULD BE PERFORMED BY PERSONS EXPERIENCED IN THIS TYPE OF GAS SERVICE TO AVOID RISK OF FIRE OR EXPLOSION. PURGE DISCHARGE MUST NOT ENTER CONFINED AREAS OR SPACES WHERE IGNITION CAN

OCCUR. THE AREA MUST BE WELL VENTILATED AND ALL SOURCES OF IGNITION MUST BE DEACTIVATED OR REMOVED.

BEFORE PLACING THE BOILER IN OPERATION, CHECK FOR GAS LEAKAGE. Use soap and water solution or other material acceptable for the purpose in locating gas leaks. DO NOT USE MATCHES, CANDLES, FLAME OR OTHER SOURCES OF IGNITION FOR THIS PURPOSE.

1. CORRECT GAS

Make sure the gas on which the boiler will operate is the same as that specified on the boiler rating plate. Do not install the boiler if equipped for a different type gas, consult your gas supplier.

2A. SIZING GAS SUPPLY LINE, (for single boiler installations),

see Table 6.

2B. SIZING GAS SUPPLY LINE, (for multiple installations of two

or more boilers), see Table 7.

Use Table 7, which is taken from ANSI booklet Z223.1,

NATIONAL FUEL GAS CODE, or CAN/CSA-B149.1 (current edition) to size iron pipe or equivalent gas supply line. Table 7 is based on a pressure drop of 0.5 inches of water and a specific gravity of 0.60 approximately that of natural gas. (LP gas has an S.G. of about

1.53).

Capacities in cubic feet per hour of 0.60 specific gravity gas for different sizes and lengths of pipe are shown in Table 7. No additional allowance is necessary for an ordinary number of fittings.

Where it is necessary to use more than the average number of pipe fittings (e.g., elbows, tees, and valves in gas supply line), use a pipe size larger than specified to compensate for increased pressure drop.

TABLE 7. SUGGESTED PIPE SIZE FOR MULTIPLE GAS APPLIANCES

Nominal Maximum Capacity of Pipe in Cubic Feet of Gas per Hour for Gas Pressures

Iron Pipe of 14 in. W.C. (0.5 psi) or Less and a Pressure Drop of 0.5 in W.C. based on a 0.60 Specific Gravity Gas

Size in Length of Pipe (Feet)

Inches 10 20 30 40 50 60 70 80 90 100 125 150 175 200

1 680 465 375 320 285 260 240 220 205 195 175 160 145 135 1 1/4 1,400 950 770 660 580 530 490 460 430 400 360 325 300 280 1 1/2 2,100 1,460 1,180 990 900 810 750 690 650 620 550 500 460 430

2 3,950 2,750 2,200 1,900 1,680 1,520 1,400 1,300 1,220 1,150 1,020 950 850 800 2 1/2 6,300 4,350 3,520 3,000 2,650 2,400 2,250 2,050 1,950 1,850 1,650 1,500 1,370 1,280

3 11,000 7,700 6,250 5,300 4,750 4,300 3,900 3,700 3,450 3,250 2,950 2,650 2,450 2,280

4 23,000 15,800 12,800 10,900 9,700 8,800 8,100 7,500 7,200 6,700 6,000 5,500 5,000 4,600

TABLE 8. MULTIPLIER TABLE

Specific Specific

Gravity Multiplier Gravity Multiplier

0.55 1.04 1.00 0.78

0.60 (natural) 1.00 1.10 0.74

0.65 0.96 1.20 0.71

0.70 0.93 1.30 0.68

0.75 0.90 1.40 0.66

0.80 0.87 1.50 (Propane) 0.63

0.85 0.84 1.60 0.61

0.90 0.82 1.70 0.59

Applications of the gravity factor converts the figures given in Table 7 to capacities with another gas of different specific gravity. Such application is accomplished by multiplying the capacities given in Table 7 by the multipliers shown in Table 8.

HIGH ALTITUDE INSTALLATIONS

WARNING

INSTALLATIONS ABOVE 5,000 FEET REQUIRE REPLACEMENT OF THE BURNER ORIFICES IN ACCORDANCE WITH THE NATIONAL FUEL GAS CODE (ANSI/NFPA 54). FAILURE TO REPLACE THE ORIFICES WILL 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.

These Genesis boilers are equipped with prejet orifices which are self-regulating. This makes it unnecessary to replace these prejet orifices for high altitude installations (up to 5,000 feet only. Consult the factory for higher altitudes). These prejet orifices will automatically compensate for higher elevations and adjust the appliance's input rate accordingly, see Table 9.

Some utility companies derate their gas for altitude. You should contact your gas supplier for any specific changes which may be required in your area. Call the local gas utility to verify BTU content of the gas supplied.

Ratings specified by manufacturers for most boilers apply for elevations up to 2000 feet (600 m). For elevations above 2000 feet (600 m) ratings must be reduced by a rate of 4% for each 1000 feet (300 m) above sea level.

Example: A Genesis boiler is rated at 750,000 Btu/hr. input at sea level. At an altitude of 5,000 (1500m), the prejet orifices will decrease the input rate by 20% (= 4% x 5) to a new rating of 600,000 Btu/hr. (= 80% x 750,000 Btu/hr.) The input reduction is achieved by the prejet orifices through self-regulation.

WIRING CONNECTIONS

ALL ELECTRICAL WORK MUST BE INSTALLED IN ACCORDANCE WITH THE CURRENT EDITIONS OF THE NATIONAL ELECTRICAL CODE NFPA 70/CANADIAN ELECTRICAL CODE, CSA 22.1 AND MUST CONFORM TO LOCAL REGULATIONS.

AN ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF ELECTRIC SHOCK OR POSSIBLE ELECTROCUTION.

the ground connection to the wire provided in the electrical supply junction box on the boiler.

Grounding and all wiring connected to this boiler must conform to the local code authority having jurisdiction or, in the absence of such requirements, with the 70 or CSA-C22.1 current edition.

IF ANY OF THE ORIGINAL WIRE, AS SUPPLIED WITH THE APPLIANCE, MUST BE REPLACED, IT MUST BE REPLACED WITH TYPE 105°C WIRE OR ITS EQUIVALENT.

The Genesis Hot Water Supply Boiler must be connected to a single phase dedicated and isolated line source that is:

120 volts, 60 Hertz, and 20 Amps.

The feedback contacts for a system controller (e.g. Honeywell Aquastat) that is attached to the thermostat input, must operate on the provided 24 VAC power.

Refer to the Connection Diagram and to the Schematic Diagram.

National Electrical Code, ANSI/NFPA

Make

TABLE 9: ORIFICE SIZE FOR NATURAL AND PROPANE (LP) GASES (U.S. AND CANADIAN INSTALLATIONS) (Drill size unless otherwise indicated.)

Model Rating Input BTUH Number of Burners Natural (3X) Propane (3X)

GB/GW 300 300,000 6 0.091" 0.048" GB/GW 400 399,900 8 0.091" 0.048" GB/GW 500 500,000 10 0.091" 0.048" GB/GW 650 650,000 13 0.091" 0.048" GB/GW 750 750,000 15 0.091" 0.048"

FIGURE 19.

GENESIS GB/GW 300-750 WIRING DIAGRAM

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