National Products Series B User Manual

Installation, Start-Up, and Operating Instructions  
Gas-Fired  
Induced-Draft Hot Water Boilers  
Sizes 42,500 through 225,000  
BW3  
Series B  
CANADIAN GAS ASSOCIATION  
ama  
®
A PPROVED  
R
®
ASME  
NOTE: Read the entire instruction manual before starting the installation. These instructions must be affixed on or adjacent to the boiler.  
This symbol indicates a change since the last issue.  
MODEL BW3  
A95465  
Index  
Page  
SAFETY CONSIDERATIONS.....................................................................................................................................................................................2  
INTRODUCTION..........................................................................................................................................................................................................3  
BOILER RATINGS AND CAPACITIES.................................................................................................................................................................3-4  
LOCATING THE BOILER.......................................................................................................................................................................................4-5  
FRESH AIR FOR COMBUSTION...........................................................................................................................................................................5-6  
Boiler Located in Unconfined Space.......................................................................................................................................................................5  
Boiler Located in Confined Space .......................................................................................................................................................................5-6  
INSTALLATION—SYSTEM PIPING .....................................................................................................................................................................6-7  
For Use with Cooling Units.....................................................................................................................................................................................7  
Low Design Water Temperature Systems (Below 140°F) .....................................................................................................................................7  
Form: IM-BW3A-05  
Cancels: IM-BW3A-04  
Printed in U.S.A.  
8-99  
Catalog No. 63BW-3A1  
INTRODUCTION  
This boiler cannot be used with all types of chimneys. Read these instructions carefully before installing.  
These Gas-Fired Hot Water Boilers are low-pressure, sectional cast iron boilers design certified by the American Gas Association (A.G.A.) and  
Canadian Gas Association (C.G.A.) for use with natural and propane gases. They are constructed and hydrostatically tested for a maximum  
working pressure of 50 psi in accordance with the American Society of Mechanical Engineers (A.S.M.E.) Boiler and Pressure Vessel Code Section  
IV Standards for cast iron heating boilers.  
Check to be sure boiler size is correct before starting installation. See rating and capacity table shown in Fig. 1. Also be sure new boiler is for  
the type of gas being used. Check rating plate on right side of boiler.  
The boiler must be supplied with correct type of gas, fresh air for combustion, and a suitable electrical supply. Boiler must also be connected to  
a suitable venting system and an adequate piping system. Finally, a properly located thermostat is needed for control of heating system. If there  
are any doubts as to the various requirements, check with local authorities and obtain professional help where needed. Take time to complete all  
the steps for SAFE and PROPER operation of heating system.  
If this boiler is installed in a building under construction, special care must be taken to insure a clean combustion air supply during the construction  
process. Airborne particulates such as from drywall dust and from fiberglass insulation can clog the burner ports and cause incomplete combustion  
and sooting.  
Where required by authority having jurisdiction, the installation must conform to American Society of Mechanical Engineers Safety Code for  
Controls and Safety Devices for Automatically Fired Boilers, No. CSD-1.  
Before installing the boiler in the United States, refer to the current edition of the NFGC and the NFPA 90B. For copies of the NFGC and NFPA  
90B, contact the National Fire Protection Association Inc., Batterymarch Park, Quincy, MA 02269; or for only the NFGC contact the American  
Gas Association, 400 N. Capitol St., N.W., Washington DC 20001.  
Before installing the boiler in Canada, refer to the NSCNGPIC. For a copy of the NSCNGPIC, contact Standard Sales, CSA International, 178  
Rexdale Boulevard, Etobicoke (Toronto), Ontario, M9W 1R3, Canada.  
Installation must comply with regulations of serving gas supplier and local building, heating, plumbing or other codes in effect in the area in which  
installation is made. In absence of local building codes, installation must comply with NFGC in the United States and the NSCNGPIC in Canada.  
The following steps are all necessary for proper installation and safe operation of boiler.  
1. LOCATING THE BOILER  
2. FRESH AIR FOR COMBUSTION  
3. INSTALLATION—SYSTEM PIPING  
4. CHIMNEY AND VENT PIPE CONNECTION  
5. GAS SUPPLY PIPING  
6. ELECTRICAL WIRING  
7. CHECKING AND ADJUSTING  
WARNING: Keep boiler area clean and free from combustible materials, gasoline, and other flammable vapors and  
liquids. Failure to follow this warning could result in explosion, electrical shock, fire, personal injury, or death.  
WARNING: Improper installation, adjustment, alteration, service, maintenance, or use can cause carbon monoxide  
poisoning, explosion, fire, electrical shock, or other conditions which may cause personal injury or property damage.  
Consult a qualified installer, service agency, local gas supplier, or your distributor or branch for information or assistance.  
The qualified installer or agency must use only factory-authorized and listed kits or accessories when modifying this  
product. Boilers with cast iron burners are not to be converted to propane. Failure to follow this warning could result in  
electrical shock, fire, personal injury, or death.  
NOTE: Installers—Follow local regulations with respect to installation of CO detectors. Follow maintenance recommendations in this instruction  
manual.  
N.B. Techniciens—Veuillez vous conformer à la réglementation en vigueur concernant l’ installation des détecteurs d’oxyde de carbone. Suivre  
les consignes d’entretien figurant dans le manuel d’instruction ci-joint.  
BOILER RATINGS AND CAPACITIES  
The ratings marked "Net I=B=R Rating" indicate the amount of remaining heat input that can be used to heat the radiation or terminal units. The  
Net I=B=R Ratings shown are based on an allowance of 1.15 in accordance with the factors in the I=B=R Standard as published by The Hydronics  
Institute. New York City MEA Number 484-84-E-Vol. III.  
Selection of boiler size should be based upon "Net I=B=R Rating" being equal to or greater than calculated heat loss of building.  
Consult manufacturer before selecting a boiler for installations having unusual piping and pickup requirements.  
These boilers must stand on a non-combustible floor. If installed on a combustible floor, a factory-approved combustible floor base must be used.  
BOILERS FOR USE AT HIGH ALTITUDE  
This boiler is factory equipped for use at altitudes of 0-2000 ft above sea level. For use at altitudes above 2000 ft above sea level, input ratings  
aUr.eS.rAed.uOcendlybyFaocrhaaltnitguedeins ambaoivneb2u0r0n0erftoaribfoicveessiezae.level, input ratings should be reduced at the rate of 4 percent for each 1000 ft above sea level.  
Consult the NFGC or the manufacturer for correct orifice sizing information. High-altitude orifices are available from boiler manufacturer.  
—3—  
1 14SUPPLY  
23 14″  
VENT  
CONNECTOR  
A
COMBINATION  
LIMIT & RELAY  
CONTROL  
RELIEF  
VALVE  
TEMP  
PRESSURE  
GAGE  
1 14RETURN  
BLOWER  
29″  
25 14″  
23″  
PRESSURE  
SWITCH  
5 58″  
5 58″  
CIRCULATOR  
INT. PILOT  
CONTROL  
BURNER  
1 34″  
GAS  
7″  
FRONT  
VALVE  
LEFT SIDE  
RIGHT SIDE  
A85084  
Gas-Fired Hot Water Boilers  
NATURAL AND PROPANE GAS†  
DIMENSIONS (IN.)  
Net  
Width  
Vent Diameter  
NO. OF  
SECTIONS  
A.G.A.  
Input  
MBH  
Heating  
Capacity  
MBH  
BOILER MODEL NUMBER*  
I=B=R  
Rating  
MBH  
To Chimney  
(Category I)  
A
BW3AAN000042ABAA  
BW3AAN000075ABAA  
BW3AAN000112ABAA  
BW3AAN000150ABAA  
BW3AAN000187ABAA  
BW3AAN000225ABAA  
2
3
4
5
6
7
42.5  
75.0  
36  
63  
31  
55  
11  
4
4
4
4
4
4
14-1/4  
17-1/2  
20-3/4  
24  
112.5  
150.0  
187.5  
225.0  
94  
82  
125  
155  
186  
109  
135  
162  
27-1/4  
* Sixth position of Model No. indicates natural or propane gas usage: N = Natural Gas  
P = Propane Gas  
Boilers are equipped for altitudes up to 2000 ft only.  
U.S.A Only—For altitudes above 2000 ft, ratings should be reduced at the rate of 4 percent for each 1000 ft above sea level.  
Canada Only—Boilers may be used at high altitude by using a certified field conversion kit, resulting in 10 percent derate.  
Heating Capacity is based on Department of Energy (DOE) test procedure.  
MBH—1000 Btuh (British Thermal Unit Per Hr)  
Fig. 1—Dimensional Drawing and Boiler Ratings and Capacities  
Canada Only—For altitudes in the range of 2000-4500 ft above sea level, boilers may be field equipped for use at high altitude by using a certified  
field conversion kit. The change in main burner orifice size results in boiler’s input rating being reduced by 10 percent. The conversion shall be  
carried out by a manufacturer’s authorized representative in accordance with the requirements of manufacturer, provincial or territorial authorities  
having jurisdiction, and in accordance with the requirements of the CAN/CGA-B149.1 and CAN/CGA-B149.2 Installation Codes. The certified  
field conversion kit includes a conversion data plate which must be attached to boiler adjacent to rating plate indicating that boiler has been  
converted for high-altitude use. The conversion data plate must be filled in with the correct conversion information.  
LOCATING THE BOILER  
NOTE: This unit MUST be set on a concrete or other non-combustible material base or floor.  
1. Select level location as centralized with piping system and as near chimney as possible.  
2. Place crated boiler at selected location. Remove crate by pulling crate sides from top and bottom boards. When boiler is to be installed on  
a combustible floor, a combustible floor base must be used.  
This boiler must NOT be installed on carpeting.  
3. Boiler is to be level. Metal shims may be used under base legs for final leveling.  
4. The floor supporting boiler must be non-combustible. If it is combustible, place the boiler on a factory-approved combustible floor base.  
We use a 2-in. Cladlite™ pad as a combustible floor base. These are available from your local supplier. Use a minimum 24-in. X 30-in.  
pad for 2-5 section boilers and a minimum 30-in. X 30-in. pad for 6-7 section boilers. The boiler must be centered on combustible floor  
base.  
5. Additional clearances for service may exceed clearances for fire protection. Always comply with the minimum fire protection clearances  
shown on the unit. An 18-inch clearance should be maintained on any side where passage is required to access another side for cleaning,  
servicing, inspecting or replacement of any part that may need attention. An 18-inch clearance is recommended on the control side for  
servicing.  
6. Determine boiler room size. Rooms that are large in comparison with the size of boiler are defined as rooms having a volume equal to or  
greater than 16 times the volume of the boiler. Where room ceiling height is greater than 8 ft, volume of room shall be figured on the basis  
of 8 ft ceiling height. Determination of room size should be based on total volume of all gas fired equipment installed in that room. (See  
Table 1.) Refer to Section 6.3 of NFGC, Central Heating Boilers and Furnaces for further information, including approved methods for  
reducing clearances in large rooms.  
—4—  
Table 1—Room Large In Comparison With Boiler  
MINIMUM ROOM  
VOLUME REQUIRED  
TO BE LARGE  
ROOM  
BOILER SIZE  
(SECTIONS)  
BOILER VOLUME  
(CU FT)  
(CU FT)*  
2
4.3  
5.6  
68.7  
89.0  
3
4
6.8  
109.3  
129.5  
149.8  
170.1  
5
8.1  
6
9.4  
7
10.6  
* For room with single boiler only.  
Table 2—Minimum Clearances From Combustible Materials and For Servicing  
ALCOVE OR ROOM  
ROOM LARGE  
IN COMPARISON  
WITH BOILER (IN.)  
NOT LARGE  
IN COMPARISON  
WITH BOILER (IN.)  
PART OF BOILER  
Top  
Rear  
6
6
6
6
Control Side  
Opposite Control Side  
Front  
8
6
6
6
18  
6
18  
6
Flue/Vent Connector  
Boiler Piping  
1
1
7. Table 2 shows minimum clearances from combustible materials.  
8. Equipment shall be installed in a location in which the facilities for ventilation permit satisfactory combustion of gas, proper venting, and  
maintenance of ambient temperature at safe limits under normal conditions of use. Equipment shall be located so as not to interfere with  
proper circulation of air. When normal infiltration does not provide necessary air, outside air shall be introduced as described in Fresh Air  
for Combustion section.  
9. Advise owner to keep air passages free of obstructions. Ventilation and combustion air must enter boiler room without restrictions.  
10. The boiler shall be installed such that the automatic gas ignition system components are protected from water (dripping, spraying, rain , etc.)  
during appliance operation and service (condensate trap, control replacement, etc.).  
FRESH AIR FOR COMBUSTION  
Provision for combustion and ventilation air must be in accordance with Section 5.3 of NFGC, Air for Combustion and Ventilation, or applicable  
provisions of local building codes.  
Canadian installations must be installed in accordance with NSCNGPIC and all authorities having jurisdiction.  
WARNING: Be sure to provide enough fresh air for combustion. Enough air ensures proper combustion and  
ASSURES THAT NO HAZARD WILL DEVELOP DUE TO LACK OF OXYGEN. Failure to follow this warning can cause a fire,  
personal injury, or death.  
You must provide for enough fresh air to assure proper combustion. The fire in the boiler uses oxygen. It must have a continuous supply. The air  
in a house contains only enough oxygen to supply the burner for a short time. Outside air must enter the house to replace the oxygen used by the  
burner. Study the following examples to determine your fresh air requirements.  
CAUTION: Air for combustion must not be contaminated by halogen compounds, which include fluoride, chloride,  
bromide, and iodide. These elements are found in aerosol sprays, detergents, bleaches, cleaning solvents, salts, air  
fresheners, and other household products. Excessive exposure to contaminated combustion air will result in safety and  
performances related problems.  
CAUTION: If a fireplace or a kitchen or bathroom exhaust fan is used, an outside air intake should be installed. These  
devices rob the boiler and water heater of combustion air.  
PROCEDURE 1—BOILER LOCATED IN UNCONFINED SPACE  
EXAMPLE 1:  
An unconfined space is defined as a space whose volume is not less than 50 cubic feet per 1,000 Btu per hour of the total input rating of all  
appliances installed in that space.  
If your boiler is in an open area (unpartitioned basement) in a conventional house, the air that leaks through the cracks around doors and windows  
will usually be adequate to provide air for combustion. The doors should not fit tightly. Do not caulk the cracks around the windows.  
—5—  
Equipment located in buildings of unusually tight construction shall be provided with air for combustion, ventilation, and dilution of flue gases  
using the methods described in example 2B or shall be specially engineered. The authority having jurisdiction must approve specially engineered  
installations.  
PROCEDURE 2—BOILER LOCATED IN CONFINED SPACE  
EXAMPLE 2A: ALL AIR FROM INSIDE THE BUILDING  
The confined space shall be provided with two permanent openings communicating directly with an additional room(s) of sufficient volume so  
that the combined volume of all spaces meets the criteria for an unconfined space. The total input of all gas utilization equipment installed in the  
combined space shall be considered in making this determination. Each opening shall have a minimum free area of one square inch per 1,000 Btu  
per hour of the total input rating of all gas utilization equipment in the confined space, but not less than 100 square inches. One opening shall be  
within 12 inches of the top and one within 12 inches of the bottom of the enclosure. The minimum dimension of air openings shall not be less  
than 3 inches.  
EXAMPLE 2B: ALL AIR FROM OUTDOORS  
The confined space shall communicate with the outdoors in accordance with examples 1 or 2. The minimum dimension of air openings shall not  
be less than 3 in. Where ducts are used, they shall be of the same cross-sectional area as the free area of the openings to which they connect.  
1. Two permanent openings, one commencing within 12 inches of the top, and one commencing within 12 inches of the bottom of the  
enclosure shall be provided. The openings shall communicate directly, or by the ducts, with the outdoors or spaces (crawl or attic) that freely  
communicate with the outdoors  
a. Where directly communicating with the outdoors or where communicating to the outdoors through vertical ducts, each opening shall have  
a minimum free area of 1 sq. in. per 4000 Btu per hour of total input rating of all equipment in the enclosure. (See Table 3A.)  
b. Where communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 sq. in. per 2000  
Btu per hour of total input rating of all equipment in the enclosure. (See Table 3B.)  
2. One permanent opening commencing with 12 inches of the top of the enclosure shall be permitted where the equipment has clearance of  
at least 1 inch from the sides and back and 6 inches from the front of the appliance. The opening shall directly communicate with the  
outdoors or shall communicate through a vertical or horizontal duct to the outdoors or spaces (crawl or attic) that freely communicate with  
the outdoors and shall have a minimum free area of:  
a. 1 sq. inch per 3000 Btu per hour of the total input of all equipment located in the enclosure (see Table 3C), and  
b. Not less than the sum of the areas of all vent connectors in the confined space.  
Table 3A—Fresh Air Duct Capacities for Vertical Ducts (Btuh)*  
100% FREE AREA  
75% FREE AREA  
25% FREE AREA  
Fresh Air  
Duct Size (In.)  
1/4-in. Mesh  
Screen  
Metal  
Louvers  
Wood  
Louvers  
3" X 12"  
8" X 8"  
144,000  
256,000  
384,000  
512,000  
108,000  
192,000  
288,000  
384,000  
36,000  
64,000  
96,000  
128,000  
8" X 12"  
8-1/2" X 16"  
* 1 Square Inch per 4,000 Btuh  
Table 3B—Fresh Air Duct Capacities for Horizontal Ducts (Btuh)*  
100% FREE AREA  
75% FREE AREA  
25% FREE AREA  
Fresh Air  
Duct Size (In.)  
1/4-in. Mesh  
Screen  
Metal  
Louvers  
Wood  
Louvers  
3" X 12"  
8" X 8"  
72,000  
128,000  
192,000  
256,000  
54,000  
96,000  
18,000  
32,000  
48,000  
64,000  
8" X 12"  
144,000  
192,000  
8-1/2" X 16"  
* 1 Square Inch per 2,000 Btuh  
Table 3C—Fresh Air Duct Capacities for Vertical or Horizontal Ducts (Btuh)*  
100% FREE AREA  
75% FREE AREA  
25% FREE AREA  
Fresh Air  
Duct Size (In.)  
1/4-in. Mesh  
Screen  
Metal  
Louvers  
Wood  
Louvers  
3" X 12"  
8" X 8"  
108,000  
192,000  
288,000  
384,000  
81,000  
144,000  
216,000  
288,000  
27,000  
48,000  
72,000  
96,000  
8" X 12"  
8-1/2" X 16"  
* 1 Square Inch per 3,000 Btuh  
—6—  
INSTALLATION—SYSTEM PIPING  
1. Place boiler in selected location (as close to chimney as possible). Boiler is shipped assembled. Only the relief valve with a drain line to  
carry any water to a drain and a drain valve need to be installed.  
2. Install relief valve on 3/4-in. pipe nipple in tapped opening in left end section. Connect a drain line of same pipe size (3/4 in.) to carry any  
water away to a drain. No shutoff of any description shall be placed between safety relief valve and boiler, or on discharge pipes between  
such safety valves and the atmosphere. Installation of safety relief valve shall conform to the requirements of the ANSI/ASME Boiler and  
Pressure Vessel Code, Section IV.  
3. Install drain valve on lower left side of boiler as marked.  
4. Connect supply and return lines to boiler. The connections may require certain additional fittings and parts. (See Fig. 2 and 4.)  
TO ZONE 1  
ELECTRIC  
ZONE  
SUPPLY MAIN  
VALVES  
AIR VENT  
AIR VENT  
COLD WATER  
INLET  
COLD  
WATER  
INLET  
SUPPLY  
MAIN  
RELIEF  
VALVE  
RELIEF  
VALVE  
AIR  
AIR  
PURGER  
PURGER  
GAUGE  
GAUGE  
TO ZONE  
2 SUPPLY  
MAIN  
FILTROL  
TANK  
FILTROL  
TANK  
LIMIT  
LIMIT  
CONTROL  
CONTROL  
RETURN  
LINE  
RETURN  
LINE  
A95176  
A96140  
Fig. 2—Forced Hot Water Typical Piping  
Fig. 3—Forced Hot Water Typical Piping with  
Zone Control Valves  
If installing an entire new heating system, first install all radiation units (panels, radiators, or cabinets) and supply and return mains, then make  
connections at boiler.  
In connecting cold water supply to water valve, make sure that a clean water supply is available. When water supply is from a well or pump, a  
sand strainer should be installed at pump.  
A hot water boiler installed above radiation level must be equipped with a low water cut-off device. A periodic inspection is necessary as is flushing  
of float-type devices per the manufacturer’s specific instructions.  
PROCEDURE 1—FOR USE WITH COOLING UNITS  
When this boiler is used in connection with refrigeration systems, it shall be installed so that the chilled medium is piped in parallel with the heating  
boiler. Appropriate valves must be used to prevent the chilled medium from entering the heating boiler. (See Fig. 4.)  
When this boiler is connected to heating coils located in air handling units where they may be exposed to refrigerated air circulation, the piping  
system shall be equipped with flow control valves or other automatic means to prevent gravity circulation of boiler water during cooling cycles.  
PROCEDURE 2—LOW DESIGN WATER TEMPERATURE SYSTEMS (BELOW 140°F)  
If boiler is to be used in a heating system where design water temperatures below 140°F are desired (for example radiant floor heating), a 3-way  
or 4-way mixing valve or suitable alternative is required to prevent low temperature return water from entering boiler. Follow mixing valve  
manufacturer’s Installation Instructions.  
The minimum design return water temperature to boiler to prevent condensation in boiler and venting system is 120°F. The minimum high limit  
setting is 140°F.  
CHIMNEY AND VENT PIPE CONNECTION  
For boilers with connections to gas vents or chimneys, vent installations shall be in accordance with Part 7 NFGC, Venting of Equipment, in the  
United States or Part 7 NSCNGPIC, Venting System and Air Supply for Appliances in Canada, and applicable provisions of local building codes.  
PROCEDURE 1—CHECKING CHIMNEY  
The chimney is a very important part of the heating system. It must be clean, the right size, properly constructed, and in GOOD CONDITION.  
No boiler can function properly with a bad chimney.  
1. Use local codes for installation or NFGC. In Canada, follow CAN/CGA-B149.1 or .2 Installation Codes. It is very important to properly  
size the venting system for induced draft appliances. Consult the Vent Sizing Tables in Part 11 of the NFGC in the United States for correct  
sizing information. In Canada, consult the Vent Sizing Tables in Appendix B of the NSCNGPIC.  
—7—  
TO SYSTEM  
A
B
C
D
WATER  
CHILLER  
VALVES C & D  
VALVES A & B  
CLOSE FOR HEATING;  
OPEN FOR COOLING  
OPEN FOR HEATING;  
CLOSE FOR COOLING  
A96141  
Fig. 4—Piping Arrangements for Boiler Used in Connection with Refrigeration System  
2. The boiler’s induced draft blower has a 3-in. outlet. A 3-in. X 4-in. increaser fitting is included in the parts bag. Locate increaser fitting  
on outlet of induced draft blower and secure gastight with a bead of the factory-supplied silicone sealant. The increaser fitting is required  
on this boiler for Category I venting, and 4 in. is the minimum permissible vent diameter. This does NOT imply that the vent connector  
is intended to be 4-in. diameter pipe. The vent connector shall be sized according to the appropriate NFGC venting tables in the U.S.A. or  
the NSCNGPIC in Canada, and may be required to be larger than 4-in. diameter.  
NOTE: The boiler installation for chimney venting is not complete unless the 3-in. X 4-in. increaser fitting is located and secured.  
3. These are energy-efficient boilers with a low stack or exhaust temperature.  
4. If venting into masonry chimney without a liner, line chimney from top to bottom with either:  
a. listed Type-B vent pipe  
b. listed flexible vent liner  
c. poured ceramic liner  
5. Outside chimneys should not be used unless they are either:  
a. enclosed in a chase  
b. lined with Type-B vent pipe, listed flexible vent liner, or other certified chimney lining system  
6. The vent connector from boiler to chimney should run as directly as possible with as few elbows as possible.  
7. Where possible, it is recommended to common vent water heater and boiler. Consult the appropriate Vent Sizing Tables in either the NFGC  
or NSCNGPIC for specific requirements of multiple appliance venting.  
8. If boiler is the only appliance connected to vent, Type-B vent pipe is recommended for vent connector.  
9. Slope pipe up from boiler to chimney not less than 1/4 in. per ft.  
10. End of vent pipe must be flush with inside face of chimney flue. Use a sealed-in thimble for chimney connection.  
11. The sections of vent pipe should be fastened with at least 3 sheet metal screws to make piping rigid. Use stovepipe wires to support pipe  
from above.  
12. Do not connect to fireplace flue.  
13. Do not install a damper on this boiler.  
PROCEDURE 2—MINIMUM VENT PIPE CLEARANCE  
If vent pipe must go through a crawlspace, Type-B vent pipe should be used. Where vent pipe passes through a combustible wall or partition, use  
a ventilated metal thimble. The thimble should be 4 in. larger in diameter than vent pipe.  
If boiler is installed with single-wall vent, it must have a 6-in. clearance between its surface and any combustible material.  
A new Type-B gas vent or flexible liner must be installed in accordance with instructions furnished with vent. Maintain clearances as specified  
for vent pipe.  
Check vent pipe to see if it is firestopped where it goes through floor or ceiling. It should have an approved vent cap with clearances from roof  
shown in Fig. 5. If clearances are less than shown in Fig. 5, have vent checked by local authorities.  
—8—  
THE VENT PIPE MUST BE AT  
LEAST 2 FT HIGHER THAN  
ANY PART OF THE ROOF  
WITHIN A 10 FT RADIUS  
OF THE VENT.  
LINER  
CHIMNEY  
2' MIN  
THIMBLE  
10'  
3' MIN  
VENT SYSTEM  
CLEANOUT  
SHEET METAL  
FIRESTOP  
A95196  
Fig. 5—Type-B Gas Vent  
Table 4—Boiler and Power Venter  
BOILER SIZE (SEC-  
FIELD CONTROLS  
TIONS)  
2, 3, 4, 5  
6, 7  
POWER VENTER KIT  
SWG-4D  
SWG-5D  
For boilers with connections to gas vents or chimneys, vent installations shall be in accordance with Part 7 NFGC, Venting of Equipment, in the  
United States or Part 7 NSCNGPUC, Venting System and Air Supply for Appliances in Canada, and applicable provisions of local building codes.  
Vent connectors serving appliances vented by natural draft shall not be connected into any portion of mechanical draft systems operating under  
positive pressure.  
PROCEDURE 3—REMOVING EXISTING BOILER FROM COMMON VENTING SYSTEM  
When an existing boiler is removed from a common venting system, the common venting system is likely to be too large for proper venting of  
the appliances remaining connected to it.  
At the time of removal of an existing boiler, the following items shall be followed with each appliance remaining connected to the common venting  
system placed in operation, while the other appliances remaining connected to the common venting system are not in operation.  
1. Seal any unused openings in the common venting system.  
2. Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or restriction, leakage, corrosion,  
and other deficiencies which could cause an unsafe condition.  
3. Insofar as is practical, close all building doors and windows and all doors between the space in which the appliances remaining connected  
to the common venting system are located and other spaces of the building. Turn on clothes dryers and any appliances not connected to  
the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed.  
Do not operate a summer exhaust fan. Close fireplace dampers.  
4. Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so appliance will operate continuously.  
5. Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle, or smoke  
from a cigarette, cigar, or pipe.  
6. After it has been determined that each appliance remaining connected to the common venting system properly vents when tested as outlined  
above, return doors, windows, exhaust fans, fireplace dampers, and any other gas-burning appliance to their previous conditions of use.  
7. Any improper operation of the common venting system should be corrected so the installation conforms with the NFGC. When resizing  
any portion of the common venting system, the common venting system should be resized to approach the minimum size as determined  
using the appropriate tables in Part 11 of the NFGC in the United States or Appendix B or the NSCNGPIC in Canada.  
NOTE: It is recommended that existing gas vents be checked to be sure they meet local codes.  
OPTIONAL HORIZONTAL VENTING WITH POWER VENTER  
Horizontal venting with a power venter is an alternate method of sidewall venting. This boiler is A.G.A. and C.G.A. listed for sidewall venting  
with standard single wall galvanized or Type-B vent pipe when using 1 of the power venter kits listed in Table 4. These kits are specifically sized  
for these boilers.  
Some possible reasons for using a power venter for sidewall venting:  
1. May be preferred by local codes  
2. Need a vent piping run beyond 30 ft (but not more than 50 ft)  
—9—  
3. Boiler installation site experiences gusting or high winds. A power venter can help prevent the boiler from short cycling due to gusting or  
high winds by providing vent exhaust pressures greater than the boiler’s induced draft blower alone.  
4. When installer or homeowner prefers a negative pressure vent system instead of a positive pressure vent system.  
5. May be more cost effective than stainless steel venting, particularly at longer vent lengths.  
The Fields Controls power vent kit includes either a SWG-II-4HD or SWG-II-5 power venter, a MG-1 4-in. barometric draft controller, and the  
CK-43D controls kit.  
Confirm that installing a power venter is an option allowed by local codes. For installation information, follow specific Installation Instructions  
provided with power venter kit.  
NOTE: Although the power venter is equipped with its own fan, the fan on the boiler MUST remain in place and unaltered when a power venter  
is used.  
When sidewall venting, flue gases must be vented to a point in relation to the prevailing wind so they may freely disperse without being blown  
back at the building causing discoloration, or into the building through doors or windows causing odors. Also, under certain conditions flue gases  
will condense, forming moisture. In such cases, steps should be taken to prevent building materials at the vent terminal from being damaged by  
the exhausted flue gas.  
When installing single wall galvanized vent pipe for power venting, follow specific power venter Installation Instructions for layout, location of  
barometric draft control, and termination connections. When joining and sealing single wall galvanized or Type-B vent piping, use RTV silicone  
sealant with a minimum temperature rating of 400°F. For 3-in vent pipe runs, begin with the female end of vent pipe over boiler’s induced draft  
blower outlet. For 4-in. vent pipe runs, begin with the 3-in. to 4-in. increaser fitting (included in boiler parts bag) over induced draft blower outlet.  
Then follow by placing female end of 4-in. vent pipe over increaser fitting. When joining pieces of single wall galvanized vent pipe, a substantial  
bead of silicone should be used at the joint to insure a leak-proof connection.  
GAS SUPPLY PIPING  
PROCEDURE 1—CHECKING GAS SUPPLY  
The gas pipe to boiler must be the correct size for length of run and for total Btuh input of all gas utilization equipment connected to it. See Table  
5 for proper size. Be sure gas line complies with local codes and gas company requirements.  
The boiler and its individual shutoff valve must be disconnected from gas supply piping system during any pressure testing of gas supply piping  
system at test pressures in excess of 0.5 psig (3.5 kPa).  
The boiler must be isolated from gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas  
supply piping system at test pressures equal to or less than 0.5 psig (3.5 kPa).  
PROCEDURE 2—CONNECTING GAS PIPING  
Refer to Fig. 6 for general layout at boiler. It shows the basic fittings needed. The gas line enters boiler from right side.  
The following rules apply:  
1. Use only those piping materials and joining methods listed as acceptable by the authority having jurisdiction or in the absence of such  
requirements, by the NFGC. In Canada, follow the CAN/CGA-B149.1 and .2 Installation Codes for Gas Burning Appliances and  
Equipment.  
2. All pipe compound must be resistant to propane gas.  
3. Install ground joint union in gas supply line between shutoff valve and boiler controls.  
Table 5—Gas Pipe Sizes  
NATURAL GAS  
Pipe Capacity—Btuh Input  
Includes Fittings  
Length  
of Pipe  
(Ft)  
MANUAL  
SHUTOFF  
VALVE  
1/2 in.  
92,000  
63,000  
50,000  
3/4 in.  
190,000  
1 in.  
1-1/4 in.  
625,000  
445,000  
365,000  
20  
40  
60  
350,000  
245,000  
195,000  
130,000  
GROUND JOINT  
UNION  
105,000  
PROPANE GAS  
Pipe Capacity—Btuh Input  
Includes Fittings  
AUTOMATIC  
GAS VALVE  
Length  
of Pipe  
Copper Tubing*  
Iron Pipe  
MANIFOLD  
(Ft)  
5/8 in.  
131,000  
90,000  
72,000  
3/4 in.  
216,000  
145,000  
121,000  
1/2 in.  
189,000  
129,000  
103,000  
3/4 in.  
393,000  
267,000  
217,000  
20  
40  
60  
* Outside diameter.  
NOTE: The length of pipe or tubing shown should be measured from gas meter or  
propane second-stage regulator.  
SEDIMENT TRAP  
FLOOR LINE  
A95148  
Fig. 6—Gas Piping at Boiler  
—10—  
4. Install a sediment trap upstream of gas controls.  
5. Use 2 pipe wrenches when making connection to gas valve to keep it from turning.  
6. Install a manual shutoff valve in vertical pipe about 5 ft above floor.  
7. Tighten all joints securely.  
8. Propane gas connections should only be made be a licensed propane installer.  
9. Two-stage regulation should be used by propane installer.  
10. Propane gas piping should be checked be propane installer.  
PROCEDURE 3—CHECKING GAS PIPING  
Upon completion of piping, check immediately for gas leaks. Open the manual shutoff valve. Test for leaks by applying soap suds (or a liquid  
detergent) to each joint. Bubbles forming indicate a leak. CORRECT EVEN THE SMALLEST LEAK AT ONCE.  
WARNING: Never use a match or open flame to test for leaks. Use a soap-and-water solution. A failure to follow this  
warning could result in fire, explosion, personal injury, or death.  
ELECTRICAL WIRING  
All electrical work must conform to local codes as well as the National Electrical Code (NEC) ANSI/NFPA-70-1999. In Canada, electrical wiring  
shall comply with the Canadian Electrical Code CSA C22.1.  
See Fig. 7 for unit wiring diagram.  
PROCEDURE 1—ELECTRIC POWER SUPPLY  
WARNING: Turn off electric power at fuse box before making any line voltage connections. Follow local electric  
codes. Failure to follow this warning could result in electrical shock, personal injury, or death.  
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and  
dangerous operation. Verify proper operation after servicing.  
Run a separate 120-v circuit from a separate overcurrent protective device in electrical service entrance panel. This should be a 15-amp circuit.  
Locate a shutoff switch at boiler. It must be turned off during any maintenance. Connect 120-v power supply to aquastat terminals L1 (HOT) and  
L2.  
The boiler, when installed, must be electrically grounded in accordance with the requirements of the authority having jurisdiction, or in the absence  
of such requirements, with the NEC. Run a 14 gage or heavier copper wire from boiler to a grounded connection in service panel or a properly  
driven and electrically grounded ground rod.  
PROCEDURE 2—INSTALLING THERMOSTAT  
Thermostat location has an important effect on the operation of boiler system. BE SURE TO FOLLOW INSTRUCTIONS INCLUDED WITH  
THERMOSTAT.  
Locate thermostat about 5 ft above floor on an inside wall. It may be mounted directly on wall or on a vertically mounted outlet box. It should  
be sensing average room temperature so avoid the following:  
DEAD SPOTS:  
Behind doors  
Corners and alcoves  
HOT SPOTS:  
Concealed pipes  
Fireplace  
TV sets  
Radios  
Lamps  
Direct sunlight  
Kitchens  
COLD SPOTS:  
Concealed pipes or ducts  
Stairwells—drafts  
Doors—drafts  
Unheated rooms on other side of wall  
Set heat anticipator at 0.2 amps. The 24-v thermostat connects to aquastat terminals T and T.  
SEQUENCE OF OPERATION  
1. Thermostat calls for heat, powering 1K relay coil and closing contacts 1K1 and 1K2.  
2. Circulator pump is powered through terminals C1 and C2.  
3. Induced draft blower and AT 140C transformer primary are powered through terminals B1 and B2.  
—11—  
S P A R K  
2 4 V  
2 4 V - G N D  
G N D  
P V  
M V / P V  
M V  
—12—  
4. When blower gets up to speed and blower suction pressure reaches pressure switch setpoint, pressure switch contacts close sending 24v to  
S8600 intermittent pilot control from AT 140C transformer secondary.  
5. Pilot gas valve opens, and spark initiates to light pilot burner.  
6. When pilot flame is proven, spark drops out.  
7. Main gas valve opens and pilot burner ignites main burners.  
8. If boiler water temperature reaches high limit setpoint, high limit contacts B-R open, cutting power to blower and S8600 intermittent pilot  
control. Burners extinguish and blower stops. Circulator pump continues to run as long as thermostat continues to call for heat. When boiler  
water temperature drops past high limit setpoint and through differential, high limit contacts B-R close, repeating items 3 through 7.  
9. If venting system becomes blocked, blower suction pressure drops below pressure switch setpoint, opening pressure switch contacts and  
cutting power to S8600 intermittent pilot control. Burners extinguish, but blower remains powered as long as thermostat continues to call  
for heat. If venting system clears, items 4 through 7 repeat.  
10. Thermostat is satisfied, ending call for heat. Relay coil 1K is de-energized, opening 1K1 and 1K2 contacts. Burners extinguish. Blower and  
circulator pump stop.  
EQUIPMENT AND OPTIONAL ACCESSORIES  
PROCEDURE 1—RELIEF VALVE  
A relief valve must be installed on boiler. Water expands as it is heated. If there is no place for water to expand into, water pressure builds up  
inside boiler and system. Should this happen, relief valve automatically opens at a predetermined pressure. This relieves strain on boiler and  
system. Run a pipe from relief valve outlet (pipe must be same size as outlet, and open end must not be threaded) to an open drain, tub or sink,  
or other suitable drainage point not subject to freezing. Failure to do so may cause water damage or injury should relief valve release.  
PROCEDURE 2—EXPANSION TANK (Optional)  
In a properly assembled system, expanding water flows into expansion tank. This tank should be of the correct size.  
The tank is filled with air. As the water expands, it compresses the air in tank to form an air pressure cushion. This "spring-like" cushion serves  
to maintain correct operating water pressure regardless of water temperature. This assures a "full measure" of water even in the highest radiation  
unit of system. It also prevents blowing off the relief valve.  
The air in tank in the beginning (with system filled with cold water) is sufficient for proper operation. The tank also serves as a trap for excess  
air in system. This air would cause gurgling in pipes and inefficient circulation in radiators if left in system.  
It is possible for a tank to become "water-logged" (filled with water). It can also become overfilled with air. This can happen after filling system  
with new water. Fittings are provided on tank and in line to tank for bleeding off excess water or air.  
When installing this tank, the following are important:  
1. Tank should be higher than boiler top.  
2. Pipe to tank should continuously rise up to tank (so that air can "bubble" up to it).  
PROCEDURE 3—DIAPHRAGM-TYPE EXPANSION TANK (Optional)  
The diaphragm-type expansion tank (EX-TROL) takes the place of a conventional expansion tank. Read instructions packed with EX-TROL tank  
assembly carefully.  
The EX-TROL tank comes with a 10-12 psi air charge. This is the same as the pressure produced in system by automatic fill valve. When system  
is first filled, EX-TROL tank contains little or no water.  
As water is heated, its pressure increases. It expands into EX-TROL tank compressing the air in tank. This compressed air cushion permits water  
in system to expand as temperature changes.  
PROCEDURE 4—AIR-ELIMINATING FITTING (AIR PURGER) (Optional)  
An air purger is used to remove excess air from system. It is installed in supply line. It helps eliminate air from water before it reaches radiators  
and bleeds off this air.  
PROCEDURE 5—MAIN AIR VENT FOR DOWNFLOW SYSTEMS OR DIAPHRAGM-TYPE EXPANSION TANK (Optional)  
Before a system is filled with water, there is air in pipes and radiation units. Some of it will be trapped as system fills. It is possible to eliminate  
most of this air through air vents on radiation units. A main air vent speeds and simplifies this process. It should be installed on highest point in  
supply main when all radiation is below top of boiler.  
PROCEDURE 6—AUTOMATIC FILL VALVE (Optional)  
For safe, efficient operation, a hot water system must be FILLED with water. Adding new water when needed can be done manually (by use of  
a hand valve in water supply line). This requires regular attention to system’s needs. An automatic fill valve accomplishes this without attention.  
It is installed in supply line on hot water boilers only. The valve operates through water pressure differentials. It does not require electrical  
connection.  
PROCEDURE 7—DRAIN VALVE  
This manual valve provides a means of draining all water from boiler and system. It is often installed in the 3/4-in. tapping at bottom of left boiler  
section. It can also be installed in a tee where return line enters boiler.  
PROCEDURE 8—WATER TEMPERATURE CONTROL  
The water temperature limit control in relay is adjustable and may be set as necessary. It may be set as low as 140°F or as high as 240°F. Setting  
depends on type and amount of radiation involved and weather conditions.  
—13—  
PROCEDURE 9—CIRCULATING PUMP  
Every forced hot water system requires a circulating pump. A separate pump or zone valve is required for each zone if there are 2 or more zones.  
This pump must have the capacity to provide circulation required by system. The pump is connected into return main just ahead of boiler and wired  
to electrical system.  
PROCEDURE 10—BLOWER (DRAFT INDUCER)  
The blower provides a means for pulling air through boiler and exhausting flue gases into vent system. The blower shuts off when burners are not  
firing. This keeps heat in the house rather than losing it up the chimney.  
PROCEDURE 11—PRESSURE SWITCH  
The air pressure switch works on a negative pressure. When blower comes on, the air pressure switch operates intermittent pilot and gas valve.  
The air pressure switch is factory set and only works when blower operates properly. It prevents boiler from starting if blower does not generate  
enough pressure or if venting system is blocked.  
The factory-set pressure switch setpoint is as follows:  
-0.4 in. wc for 2-5 section boilers  
-0.5 in. wc for 6-7 section boilers  
PROCEDURE 12—ROLLOUT SWITCH (FLAME ROLLOUT SAFETY SHUTOFF)  
The rollout switch is a temperature-sensitive fuse link device. It is located on boiler base just outside fire box. In the event of heat exchanger  
flueway blockage causing flame to roll out of fire box, the fuse blows shutting down flow of gas to main burners. The fuse does not change in  
appearance when blown.  
If rollout switch blows, it must be replaced with an exact replacement. Check heat exchanger flueways for blockage when restoring system to  
operating condition. Do not operate system without a rollout switch.  
STARTING BOILER  
PROCEDURE 1—HOW A HOT WATER SYSTEM OPERATES  
The entire heating system (boiler, piping, and radiation units) is filled with water. As water in boiler is heated, it is pumped from top of boiler  
through supply main to radiation units. The cooler water in them flows back through return main to boiler. This provides positive and rapid  
response to thermostat.  
PROCEDURE 2—FILLING SYSTEM WITH WATER  
To fill:  
1. Close air vents on all radiation units. Open valves to these units.  
2. Make sure boiler and expansion tank drain cocks are closed. The air bleed screw on tank drain fitting should be closed.  
3. Open valve in line from boiler to expansion tank. Refer to Maintaining Boiler section for additional information.  
4. Open water inlet to boiler and leave it open.  
5. Start with LOWEST radiation unit. Open air vent on this unit. When all air has escaped and water starts to flow from vent, close air vent.  
6. Proceed to next lowest radiation unit and repeat process outlined in item 5. Repeat until every radiation unit in system has been covered.  
End with highest unit in system. If units have automatic vents, this manual venting is unnecessary but speeds up proper filling of system.  
If system is a closed expansion tank system, there may be an automatic fill valve. It may be left open to refill system automatically as needed.  
Check temperature-pressure gage. Note position of hand indicating pressure. This should be between 10 and 15 lb. Any lowering of this movable  
hand below 10 lb indicates loss of water due to leakage. The automatic fill valve should compensate for this. Instructions are packaged with valve.  
CAUTION: Never run water into a hot, empty boiler.  
FOR YOUR SAFETY READ BEFORE OPERATING  
WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage,  
personal injury, or loss of life.  
This appliance is equipped with an ignition device which automatically lights burner. Do NOT try to light burner by hand.  
—14—  
BEFORE OPERATING, smell all around appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will  
settle on the floor.  
WARNING: IF YOU SMELL GAS:  
• Do not attempt to operate any appliance; do not touch any electric switch; do not use any phone in your building.  
• Leave the building immediately and call your gas supplier. • If your gas supplier cannot be reached, call the fire  
department.  
WARNING: When turning gas control knob, use only your hand to turn knob. Never use tools. If knob will not operate  
by hand, control must be replaced by a qualified service technician. Force or attempted repair may result in a fire or  
explosion.  
WARNING: If any part of this appliance has been under water, do not operate. Immediately call a qualified service  
technician to inspect the appliance and to replace any part of gas control system which has been under water.  
GAS VALVE OPERATING INSTRUCTIONS  
A. To Turn On Gas To Appliance  
1. STOP! Read safety information in For Your Safety Read Before Operating section.  
2. Set thermostat to lowest setting.  
3. Turn off all electrical power to appliance.  
4. This appliance is equipped with an ignition device which automatically lights burner. Do NOT try to light burner by hand.  
5. Remove burner access panel.  
6. Turn gas control knob clockwise to OFF position. (See Fig. 8.)  
WARNING: Wait 5 minutes to allow any gas in the combustion chamber to vent. If you then smell gas in appliance area  
or near the floor, do not touch any electrical switch; do not use the phone. Leave the building immediately and call your gas  
supplier. If your gas supplier cannot be reached, call the fire department. Failure to do so may result if a fire or explosion.  
If you do not smell gas, go to the next item.  
7. Turn gas control knob counterclockwise to ON position. (See Fig. 8.)  
8. Turn on all electrical power to appliance.  
9. Set thermostat to desired setting.  
10. After visually inspecting flame, replace lower front panel.  
WARNING: If appliance will not operate after several tries, turn gas control knob to OFF position and call your service  
technician or gas supplier.  
B. To Turn Off Gas To Appliance  
1. Set thermostat to lowest setting.  
2. Turn off all electric power to appliance if service is to be performed.  
3. Turn gas control knob clockwise to OFF position. (See Fig. 8.) Do not force.  
ON  
GAS  
INLET  
OFF  
GAS CONTROL  
KNOB SHOWN  
IN "ON" POSITION  
A95154  
Fig. 8—Gas Valve  
—15—  
PRESSURE REGULATOR  
ADJUSTMENT  
(UNDER CAP SCREW)  
OUTLET  
PRESSURE  
TAP  
WIRING  
TERMINALS (3)  
GROUND  
TERMINALS (2)  
INLET  
PRESSURE  
TAP  
GAS  
INLET  
GAS  
OUTLET  
38to 12″  
ON  
FLAME  
ON SENSOR  
OFF  
PILOT  
OUTLET  
PILOT  
GAS CONTROL  
ADJUSTMENT  
(UNDER CAP  
SCREW)  
KNOB SHOWN  
IN "ON" POSITION  
A95160  
A95520  
Fig. 9—Pilot Flame and Sensor  
Fig. 10—Automatic Gas Valve  
Table 6—Recommended Boiler Water Temperatures  
TYPE OF HEATING UNIT  
LIMIT CONTROL SETTING  
Standing Radiators  
180°F  
200°F  
Baseboard and Convector Radiators  
CHECKING AND ADJUSTING  
PROCEDURE 1—GAS VALVE SAFETY SHUTDOWN TEST  
With main burners firing, disconnect ignition cable from intermittent pilot control box. Gas valve should shut off main burners. TURN OFF  
ELECTRIC POWER to boiler before reconnecting ignition cable to prevent electric shock.  
PROCEDURE 2—PILOT BURNER ADJUSTMENT  
Pilot flame should surround 3/8- to 1/2-in. of pilot sensor. (See Fig. 9.) If flame needs adjusting, proceed as follows:  
1. Remove screw cover over pilot adjusting screw. (See Fig. 10.)  
2. Insert small screwdriver and adjust flame as needed. (See Fig. 9 and 11.) Turn screw counterclockwise to increase flame and clockwise to  
decrease flame.  
3. Replace screw cover over pilot adjusting screw.  
PROCEDURE 3—MAIN BURNER(S)  
The main burners do not require primary air adjustment and are not equipped with primary air shutters. Main burner flames should form sharp  
blue inner cones in a softer blue out mantel, with no yellow. Puffs of air from blowing on the flame or stamping on the floor will cause the flames  
to turn orange momentarily. This is not unusual. Remain still when observing the main burner flames. If the flame appearance is not correct, check  
main burner orifices and the burner throat and flame ports for dust and lint obstruction. It may be necessary to remove the rollout shield to observe  
the main burner flames. Replace rollout shield after observation. (See Fig. 11.)  
PROCEDURE 4—LIMIT CONTROLS ADJUSTMENT  
Instructions for each control are included with controls.  
Table 6 shows recommended boiler water temperatures. These settings can be changed after becoming familiar with system operation. For  
example, if system is not giving quite enough heat in very cold weather, the limit setting can be raised to 220°F.  
PROCEDURE 5—THERMOSTAT HEAT ANTICIPATOR ADJUSTMENT  
Instructions for final adjustment of thermostat are packaged with thermostat.  
Set heat anticipator at 0.2.  
Check thermostat operation. When set above temperature indicated on thermometer, boiler burners should ignite. Make certain thermostat shuts  
boiler off when room temperature reaches selected setting and starts boiler operating when room temperature falls a few degrees.  
PROCEDURE 6—SAFETY CONTROLS CHECK  
After setting limit control to desired setting, check to see if it shuts off gas supply to burners. Set thermostat to call for heat and let boiler run until  
temperature of water reaches limit setting. Gas valve should shut off and circulator should keep running until thermostat is satisfied or water cools  
enough to restart burners through limit control.  
To check operation of contacts in pressure switch, disconnect rubber tubing (located between blower and pressure switch) from pressure switch  
while boiler is operating. The burners should extinguish, and blower should keep running. When tubing is reconnected to pressure switch, ignition  
sequence should begin, resulting in ignition of main burners.  
Finally, set thermostat for desired temperature. Special conditions in home and location of thermostat govern this setting.  
Safe lighting and other performance criteria were met with gas manifold and control assembly provided on boiler when boiler underwent tests  
specified in ANSI Z21.13.  
—16—  
MAINTAINING BOILER  
PROCEDURE 1—BURNERS  
A visual check of pilot and main burner flames should be made at least once each year, preferably at beginning of heating season. See Checking  
and Adjusting section and Fig. 9, 11, and 12. Main burner flame should form a sharp blue cone with no yellow.  
PROCEDURE 2—RELIEF VALVE  
This valve should open automatically when system pressure exceeds pressure rating (usually 30 psi) of relief valve. Should it ever fail to open under  
this condition, shut down system. Drain system until pressure is reduced below relief valve pressure rating. If valve discharge occurs or if valve  
fails to open as described above, contact an authorized contractor or qualified service technician to replace relief valve and inspect heating system  
to determine the cause, as this may indicate an equipment malfunction.  
This valve should be tested every month during periods of boiler operation, and at the beginning and end of any extended non-service period. Prior  
to testing, make certain discharge pipe is properly connected to valve outlet and arranged so as to contain and safely dispose of boiler discharge.  
Test at normal system operating pressure. Hold trip lever fully open for at least 5 sec in order to flush free any sediment that may lodge on valve  
seat, then permit valve to snap shut.  
PROCEDURE 3—EXPANSION TANK  
As previously noted, this tank may become waterlogged or may receive an excess of air. Frequent automatic opening of relief valve indicates  
waterlogging. A high boiler temperature accompanied by unusually low radiation unit temperature (and "knocking") indicates excess air in tank.  
To correct either condition, close valve between boiler and tank. Drain tank until it is empty. Check all tank plugs and fittings. Tighten as necessary.  
Open valve between boiler and tank. Water will rise to normal height in tank if automatic fill valve is installed, otherwise, manually refill system.  
PROCEDURE 4—BOILER FLUE PASSAGES  
Under normal operating conditions with burners properly adjusted, it should not be necessary to clean boiler flue gas passages. However, to assure  
trouble-free operation, we recommend that flue passages, burner adjustment, and operation of controls be checked ONCE EACH YEAR by a  
competent service technician.  
BEFORE THE START OF EACH SEASON (or whenever system has been shut down for some time), recheck whole system for leaks and recheck  
boiler and vent pipe for leaks. Replace or patch any boiler seals that are faulty.  
PROCEDURE 5—VENT PIPE  
The venting of this unit is very important. Piping should be checked at least once a month. If vent piping shows any signs of leaking, replace it  
immediately.  
PROCEDURE 6—WATER SYSTEM  
If system is to remain out of service during freezing weather, always DRAIN IT completely. Water left in to freeze will crack pipes and/or boiler.  
PROCEDURE 7—CLEANING BOILER AND BURNERS  
Flue passages between sections should be examined yearly and cleaned if necessary. To clean:  
1. Remove burners, pilot, and vent pipe.  
2. Remove top and front jacket panels.  
3. Split silicone seal on flue collector and cleanout plates with a razor knife.  
4. Remove flue collector.  
5. Remove cleanout plates by tapping upwards on bottom of plate with a hammer.  
6. Remove loose silicone sealant from sections, flue collector, and cleanout plates.  
7. Clean passageways between sections with a flexible handle wire brush and a straightened out wire coat hanger. Remove dirt from bottom  
of boiler and between sections by vacuuming.  
8. Make sure all flame ports in burners are open and clear. Shake out or blow out all loose dirt in burners.  
9. Reassemble all parts.  
10. Seal flue collector and cleanout plates to sections with 400°F RTV silicone sealant or equivalent.  
11. Reseal seams between adjacent sections as necessary. All joints MUST be airtight.  
OUTER MANTEL  
SHARP INNER CONES  
A99182  
Fig. 11—Main Burner Flame  
—17—  
12. Be sure to check tightness of pilot connections and condition of burner flames after reassembly. (See Fig. 11.)  
13. Be sure vent pipe connections to chimney are secure and no obstructions are present.  
PROCEDURE 8—BLOWER  
The blower motor features permanently lubricated ball bearing construction. Lubrication is not required.  
SERVICE HINTS  
You may avoid inconvenience and service calls by checking these points before you call for service.  
FOR YOUR SAFETY  
WHAT TO DO IF YOU SMELL GAS  
1. Do not try to light any appliance.  
2. Do not touch any electric switch; do not use the phone.  
3. Leave the building immediately, then call your gas supplier.  
4. If you cannot reach the gas supplier, call the fire department.  
IF SYSTEM IS NOT HEATING OR NOT GIVING ENOUGH HEAT. . .  
Possible Cause  
What To Do  
Thermostat is not set correctly  
Reset thermostat above room temperature.  
Check flame. If it is yellow, burner is not getting enough air. If flame is blue and noisy and seems to lift off  
the burner, burner is getting too much air. Contact your service technician.  
Burner is not operating properly  
No electric power to boiler  
Controls out of adjustment  
Radiators not heating  
Check overcurrent protection. Check to be sure electric power supply circuit is on.  
Reset according to instructions.  
Open radiator vents to vent excess air. Check flow control valve (if used). It may be in closed position.  
Check overcurrent protection. Check relay operation.  
Circulator pump not running  
Poor electrical contact  
Check all control terminals and wire joints.  
Pressure switch will not close and pilot spark will not operate to start pilot. Have your service technician  
check and correct, if necessary.  
Chimney flue is blocked  
Rollout switch blown  
Have your service technician check heat exchanger for blockage. Replace rollout switch with exact replace-  
ment.  
IF BURNER IS NOISY. . .  
What To Do  
Possible Cause  
Gas input amount is incorrect  
Contact your service technician.  
RELIEF VALVE LEAKING. . .  
What To Do  
Possible Cause  
Dirt on seat  
Open valve manually. Allow water to run and clear valve seat.  
Drain tank. See instructions.  
Waterlogged expansion tank  
HAVE YOUR SERVICE TECHNICIAN CHECK ANY PROBLEM YOU ARE UNABLE TO CORRECT.  
—18—  
REPAIR PARTS  
IMPORTANT — READ THESE INSTRUCTIONS BEFORE ORDERING All parts listed in the following Parts List may be ordered  
through your nearest supplier.  
When ordering parts, first obtain the Model No. from the data plate on boiler, then determine the Part No. (not the Key No.) and the Description  
of each part from the following illustrations and lists. Be sure to give all this information: The Part No. — The Part Description — The Boiler  
Model No.  
FOR USE WITH NATURAL GAS ONLY  
3
6
4
5
6A  
2
1
A98238  
Natural Gas Burners and Manifold Parts  
This is a Repair Parts List—Not a Packing List  
PART NO.  
4 Section  
KEY  
NO.  
DESCRIPTION  
2 Section  
146-62-052  
146-15-005  
146-95-301  
146-16-042  
146-15-030  
3 Section  
146-62-052  
146-15-005  
146-95-301  
146-16-043  
146-15-031  
146-15-532  
146-15-531  
146-62-092  
425-00-933  
5 Section  
146-62-052  
146-15-005  
146-95-301  
146-16-045  
146-15-031  
146-15-532  
146-15-531  
146-62-092  
425-00-935  
6 Section  
146-62-058  
146-15-006  
146-95-301  
146-16-024  
146-15-035  
146-15-532  
146-15-531  
146-62-092  
425-00-936  
7 Section  
1
2
24-v Gas Valve, Natural Gas  
Pilot Tube  
146-62-052  
146-15-005  
146-95-301  
146-16-044  
146-15-031  
146-15-532  
146-15-531  
146-62-092  
425-00-934  
146-62-058  
146-15-006  
146-95-301  
146-16-025  
146-15-035  
146-15-532  
146-15-531  
146-62-092  
425-00-937  
3
10-32 X 3/16-in. Slotted Hex Head Screw  
Gas Manifold  
4
5
Orifice — Natural Gas*  
6
Main Burner Less Pilot Bracket†  
Main Burner with Pilot Bracket  
Pilot Burner with Orifice, Natural Gas  
Rollout Shield  
6A  
7
146-15-531  
146-62-091  
425-00-932  
Quantity is 1 unless otherwise noted.  
* Requires 1 less than the number of sections.  
Requires 2 less than the number of sections.  
Not illustrated.  
—19—  
REPAIR PARTS  
FOR USE WITH PROPANE GAS ONLY  
3
6
4
5
6A  
2
1
A98238  
Propane Gas Burners and Manifold Parts  
This is a Repair Parts List—Not a Packing List  
PART NO.  
4 Section  
KEY  
NO.  
DESCRIPTION  
2 Section  
146-62-062  
146-15-005  
146-95-301  
146-16-020  
146-15-036  
3 Section  
146-62-062  
146-15-005  
146-95-301  
146-16-021  
146-15-036  
146-15-532  
146-15-531  
146-62-094  
425-00-933  
5 Section  
146-62-062  
146-15-005  
146-95-301  
146-16-023  
146-15-036  
146-15-532  
146-15-531  
146-62-094  
425-00-935  
6 Section  
146-62-059  
146-15-006  
146-95-301  
146-16-024  
146-15-036  
146-15-532  
146-15-531  
146-62-094  
425-00-936  
7 Section  
1
2
24-v Gas Valve, Propane Gas  
Pilot Tube  
146-62-062  
146-15-005  
146-95-301  
146-16-022  
146-15-036  
146-15-532  
146-15-531  
146-62-094  
425-00-934  
146-62-059  
146-15-006  
146-95-301  
146-16-025  
146-15-036  
146-15-532  
146-15-531  
146-62-094  
425-00-937  
3
10-32 X 3/16-in. Slotted Hex Head Screw  
Gas Manifold  
4
5
Orifice — Propane Gas*  
6
Main Burner Less Pilot Bracket†  
Main Burner with Pilot Bracket  
Pilot Burner with Orifice, Propane Gas  
Rollout Shield  
6A  
7
146-15-531  
146-62-093  
425-00-932  
Quantity is 1 unless otherwise noted.  
* Requires 1 less than the number of sections.  
Requires 2 less than the number of sections.  
Not illustrated.  
—20—  
REPAIR PARTS  
15  
16  
11  
14  
17  
13  
18  
12  
3
2
10  
7
6
8
9
5
4
19  
1
A95202  
Jacket—Section and Base Parts This is a Repair Parts List—Not a Packing List  
PART NO.  
KEY  
NO.  
DESCRIPTION  
2 Section  
3 Section  
4 Section  
5 Section  
6 Section  
730-00-1050  
730-00-1170  
146-80-005  
425-01-498  
425-01-737  
146-14-020  
146-14-116  
146-14-126  
433-01-976  
730-00-1040  
730-00-1036  
146-05-053  
146-95-041  
410-01-019  
410-01-018  
730-00-1016  
7 Section  
730-00-1050  
730-00-1170  
146-80-005  
425-01-499  
425-01-738  
146-14-020  
146-14-117  
146-14-127  
433-01-976  
730-00-1040  
730-00-1037  
146-05-005  
146-95-041  
410-01-019  
410-01-018  
730-00-1017  
1
2
3
4
5
Jacket, Right Side Panel  
730-00-1050 730-00-1050 730-00-1050 730-00-1050  
730-00-1170 730-00-1170 730-00-1170 730-00-1170  
Blower Cover Plate  
Rating Plate  
146-80-005  
425-01-494  
425-01-733  
146-14-020  
146-14-112  
146-14-122  
433-01-976  
146-80-005  
425-01-495  
425-01-734  
146-14-020  
146-14-113  
146-14-123  
433-01-976  
146-80-005  
425-01-496  
425-01-735  
146-14-020  
146-14-114  
146-14-124  
433-01-976  
146-80-005  
425-01-497  
425-01-736  
146-14-020  
146-14-115  
146-14-125  
433-01-976  
Jacket Tie Bar  
Boiler Base  
Base Side (2 Required)  
Base Front  
6
Base Insulation  
Base Rear  
7
Nipple, Boiler  
8
Jacket, Left Side Panel  
Jacket, Front Panel  
730-00-1040 730-00-1040 730-00-1040 730-00-1040  
730-00-1032 730-00-1033 730-00-1034 730-00-1035  
9
10  
11  
12  
13  
14  
1/4-in. Tie Rod (2 Required)  
Nut and Washer  
146-05-008  
146-95-041  
410-01-019  
146-05-002  
146-95-041  
410-01-019  
410-01-018  
146-05-002  
146-95-041  
410-01-019  
410-01-018  
146-05-051  
146-95-041  
410-01-019  
410-01-018  
Section, Left End  
Section, Intermediate  
Jacket, Top Panel  
730-00-1012 730-00-1013 730-00-1014 730-00-1015  
425-01-539 425-01-540 425-01-541 425-01-542  
730-00-3002 730-00-3003 730-00-3004 730-00-3005  
410-01-017 410-01-017 410-01-017 410-01-017  
(1) 425-01-540  
(1) 425-01-541  
15  
Cleanout Plate(s)  
(2) 425-01-541  
16  
17  
18  
*
Flue Collector  
730-00-3006  
410-01-017  
730-00-1026  
730-70-1006  
146-95-074  
410-01-612  
146-14-032  
730-00-3007  
410-01-017  
730-00-1027  
730-70-1007  
146-95-074  
410-01-712  
146-14-032  
Section, Right End  
Jacket, Back Panel  
730-00-1022 730-00-1023 730-00-1024 730-00-1025  
730-70-1002 730-70-1003 730-70-1004 730-70-1005  
Jacket Complete  
19  
*
No. 10 X 1/2-in. Sheet Metal Screw  
Block Assembly (Includes 7, 10, 11, 12, 13, 17)  
Combustible Floor Base  
146-95-074  
410-01-212  
146-14-031  
146-95-074  
410-01-312  
146-14-031  
146-95-074  
410-01-412  
146-14-031  
146-95-074  
410-01-512  
146-14-031  
*
* Not illustrated.  
—21—  
REPAIR PARTS  
BOILER CONTROLS AND PIPING  
1
3
2
5
6
4
10  
11  
7
9
8
A99276  
KEY NO.  
DESCRIPTION  
PART NO.  
146-22-011  
146-07-040  
146-23-007  
146-07-019  
146-93-049  
433-00-521  
146-26-047  
146-26-045  
146-07-004  
146-62-071  
433-00-511  
146-55-006  
146-55-005  
146-29-003  
146-29-002  
146-93-006  
146-26-049  
146-26-050  
146-62-080  
146-07-031  
146-93-054  
146-06-020  
146-28-012  
1
2
3/4-in. ASME Relief Valve  
3/4-in. X 5-1/2-in. Nipple  
3
Temperature-Pressure Gage—3-1/2-in. Shank  
1-1/4-in. X 5-1/2-in. Nipple  
4
5
1-1/4-in. X 3/4-in. X 1-1/4-in Tee  
L8148A Combination Hi Limit and Relay Control  
Taco Pump 007  
6
7
*
Grundfos Pump UP15-42F  
8
1-1/4-in. Bent Return Nipple  
9
Intermittent Pilot Control — S8600M  
Induced Draft Blower and Gasket  
10  
2, 3, 4, 5 Section  
6, 7 Section  
11  
Pressure Switch  
*
*
*
*
*
*
*
*
*
*
Rubber Tube (Blower to Pressure Switch)  
Rollout Switch  
1-1/4-in X 3/4-in. Bushing  
Taco Flange Set  
Grundfos Flange Set  
AT 140C 24-v Transformer  
1/4-in. Close Nipple  
1/4-in. Coupling  
400°F Black Silicone Rubber Adhesive Sealant (10.3 oz cartridge)  
3-in. X 4-in. Increaser Fitting — Galvanized  
* Not illustrated.  
—22—  
SERVICE TRAINING  
Packaged Service Training programs are an excellent way to increase your  
knowledge of the equipment discussed in this manual, including:  
• Unit Familiarization  
• Installation Overview  
• Maintenance  
• Operating Sequence  
A large selection of product, theory, and skills programs is available, using popular  
video-based formats and materials. All include video and/or slides, plus companion  
book.  
Classroom Service Training plus "hands-on" the products in our labs can mean  
increased confidence that really pays dividends in faster troubleshooting, fewer  
callbacks. Course descriptions and schedules are in our catalog.  
CALL FOR FREE CATALOG 1-800-962-9212  
[ ] Packaged Service Training  
[ ] Classroom Service Training  
A94328  
—23—  
© 1999 CAC/BDP P.O. Box 70, Indianapolis, IN 46206  
imbw3a05  
—24—  
Catalog No. 63BW-3A1  

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