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BWF Series
Gas-Fired Fan Assisted Hot Water Boilers
INSTALLATION INSTRUCTIONS
These instructions must be affixed on or adjacent to the boiler
WARNING: Improper installa-
Models:
tion, adjustment, alteration,
service or maintenance can
• BWF061
cause property damage, injury,
or loss of life. For assistance or
• BWF095
additional information, consult a
• BWF128
qualified installer, service
agency or the gas supplier.
• BWF162
This boiler requires a special
• BWF195
venting system. Read these
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Table of Contents I Product Description………………………...2 II Specifications……………………………….. 2 III Before Installing……………………………..3 IV Locating the Boiler………………………….. 3 V Air for Combustion and Ventilation………… 5 VI Venting………………………………………. 9 Horizontal Vent System Design……….. 9 Vertical Vent System Design…………... 14 Vent System Assembly………………….18 VII Gas Piping………………………………… 25 VIII System Piping………………………………. 26 IX Wiring…………………
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I Product Description The BWF series boiler is a cast iron gas fired boiler designed for use in forced hot water heating systems. The BWF is intended for installations where a usable chimney is not available. The BWF is normally vented using an approved vertical or horizontal AL29-4C stainless steel venting system, which is not included with the boiler. If a suitable chimney is available, the BWF series can be vented into it using an optional BWF Category I Vent Kit available from Crown
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III Before Installing 1) Safe, reliable operation of this boiler depends upon installation by a professional heating contractor in strict accordance with this manual and the authority having jurisdiction. • In the absence of an authority having jurisdiction, installation must be in accordance with this manual and the National Fuel Gas Code, ANSI Z223.1 • In Canada, installation must be in accordance with CSA B149 (Installation Code for Gas Burning Appliances and Equipment).
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3) Do not install this boiler in an area where large amounts of airborne dust will be present, such as a workshop. Do not install in a location where sources of hydrocarbons will be stored or used. Some common sources of hydrocarbons include bleaches, fabric softeners, paints, cleaners, refrigerants, and cat boxes. Traces of these chemicals can be drawn into the boiler, causing severe corrosion damage to the boiler and/or objection
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V Air for Combustion and Ventilation Sufficient fresh air must be supplied for both combustion and ventilation. Provisions for combustion, ventilation, and dilution air for gas utilization equipment must be made in accordance with local building codes, or in the absence of such codes, in accordance with Sections 5.3.3 and 5.3.4 (“Air for Combustion and Ventilation”) of the National Fuel Gas Code, NFPA 54/ANSI Z223.1. To ensure an adequate combustion and ventilation air supply
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If the boiler is in a confined space – Provide two openings into the boiler room, one near the floor and one near the ceiling. The top edge of the upper opening must be within 12” of the ceiling and the bottom edge of the lower opening must be within 12” of the floor (Fig 3). • Each opening must have a free area of 1 square inch per 1000 BTU/hr input of all gas burning appliances in the boiler room. The minimum opening dimension is 3 inches. Minimum opening free area is 100 square inches p
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VI Venting There are three basic ways to vent the BWF boiler: • Horizontal (“side wall”) venting using an approved AL29-4C stainless steel vent system. • Vertical venting using an approved AL29-4C stainless steel vent system. • Chimney venting using a masonry or “B” vent chimney and a special Category I Vent Kit available from Crown. WARNING DO NOT ATTEMPT TO VENT A BWF SERIES BOILER INTO A MASONRY OR “B” VENT CHIMNEY WITHOUT THE CROWN CATEGORY I VENT KIT SHOWN IN TABLE
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Horizontal Vent System Design 1) See Figure 8 for the general horizontal exhaust configuration. For the purposes of this manual, a “horizontal exhaust system” is one that exits the structure through a wall. 2) Approved Systems – Use one of these four approved vent systems: • Flex-L-International Star-34 • Z-FLEX SVE Series III (“Z-Vent II”) • Heat Fab Saf-T Vent • ProTech Systems FasNSeal 3) Vent Pipe Size: • BWF061 to BWF162– 3” • BWF-195, BWF-229 –3” or 4” 4) Maximum V
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5) Minimum Vent Pipe Length: 2 ft + (1) 90 degree elbow + terminal 6) Permitted Terminals: • Choice of Tjernlund VH1 series terminal, a 90-degree elbow with rodent screen, or a termination tee with a rodent screen. The Tjurnlund VH1 terminals may not be used on BWF195s and BWF 229s when they are vented with 3” pipe. If the Tjurnlund terminal is used, select one of the following: BWF061 to BWF162: Tjernlund VH1-3 (Crown #50-032) 3” terminal BWF195, BWF229: Tjernlund VH1-4 (Crown #50
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12) Location of Horizontal Vent Terminal – Observe the following limitations on the terminal location: • Terminal must be at least 4 feet below or 4 feet horizontally from any window, door, or gravity air inlet into the building (Fig. 10). • The bottom of the terminal must be at least 12” above the normal snow line. In no case should it be less than 12” above grade level (Fig 10). • The bottom of the terminal must be at least 7 feet above a public walkway. • The bottom of t
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Vertical Vent System Design 1) See Figure 13 for the general vertical stainless steel venting configuration. For the purposes of this manual, a “vertical exhaust system” is a Category III vent system that exits the structure through a roof. 2) Approved Systems – Use one of these four approved vent systems: • Flex-L-International Star-34 • Z-FLEX SVE SeriesIII (“Z-Vent III”) • Heat Fab Saf-T Vent • ProTech Systems FasNSeal 3) Vent Pipe Size: • BWF061 to BWF162– 3”
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4) Maximum Vent Pipe Length: • BWF061 to BWF162 – 39.5 ft + (2) 90 degree elbows + cap • BWF195, BWF229 (using 4” vent pipe): 37 ft + (2) 90 degree elbows + cap • BWF195, BWF229 (using 3” vent pipe): 24.5 ft + (2) 90 degree elbows + cap • Reduce the above maximum straight pipe runs by the equivalent length from Table 4 for each additional elbow beyond the first two. Example: A vertical vent system is planned for a BWF162 that has the following components: 2 ft vertical pipe 1 9
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11) Piping supports – Vertical and horizontal sections of piping must be properly supported. See the “Vent System Assembly” section of this manual for more information. 12) Location of vent cap– The lowest discharge opening on the cap must be at least 2 feet above any object located within 10 feet (Fig. 14): 16
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TABLE 7: FIRESTOPS FOR VERTICAL VENT SYSTEMS VENT MANUFACTURER'S PART # VENT SYSTEM 3 INCH 4 INCH FLEX-L-INTL STAR-34 SRFS03 SRFS04 Z-FLEX SVE SERIES III (SUPPORT) 2SVSFSSF03 2SVSFSSF04 Z-FLEX SVE SERIES III (SPACER) 2SVSFSF03 2SVSFSF04 HEAT FAB SAF-T VENT 7373GC 7473GC PROTECH SYSTEMS FASNSEAL FSFS3 FSFS4 Removing an Existing Boiler From a Common Chimney In some cases, when an existing boiler is removed from a common chimney, the common venting system may be too large for th
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Vent System Assembly 1) General Assembly Notes: a) Where the use of “silicone” is called for in the following instructions, use only the following sealants: • Flex-L-International Star-34 – GE RTV106 or GE IS806 • Z-FLEX SVE Series III (“Z-Vent III”) – Silicone not required for joints between pipe sections. • Heat Fab Saf-T Vent – GE RTV 106 • ProTech Systems FasNSeal - Silicone not required for joints between pipe sections. • Use the same silicone used to seal vent pipe sect
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4) Assembly of Flex-L-Intl. Star-34 Vent System: a) Star-34 General Notes: • Do not cut Star-34 vent components. • Support horizontal piping sections at intervals of 48” or less. • Vertical venting systems must be supported by at least one Star-34 Firestop. An additional vertical support is required after any offset. • Orient Star-34 components so that the arrows on the piping labels are in the direction of flue gas flow. b) Start assembly of the vent system at the boiler. Remove t
