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- FIELD CONTROLS, LLC - CONTRACTOR PRODUCTS DRAFT CONTROLS

FIELD CONTROLS, LLC - CONTRACTOR PRODUCTS DRAFT CONTROLS

Draft Controls

For proper operation and efficient fuel consumption in oil, gas and/or coal-fired heating appliances, draft must remain constant. When it is, combustion is more

complete, fuels are utilized efficiently, and money is saved.

Field Draft Controls maintain consistent draft by counteracting the negative forces caused by changes in temperature and barometric pressure, and the effects of

wind.

RC M MG-1 M+MG2

When to use a Draft Control

• Draft Inducers/Power Venters

With these devices, draft is increased or created, causing fluctuations in air flow through the combustion chamber. These fluctuations can be negated by the use

of a barometric draft control located between the draft inducer or power venter and the furnace, boiler or water heater it services. Use a single acting control for

oil and gas-fired equipment with a power vented system. A single-acting control for oil, and a double-acting control for gas-fired equipment with a draft

induced system.

• Power Burners

A power burner is designed so that a fan delivers negative air pressure to the combustion chamber. A single-acting draft control for oil maintains that negative

pressure.

A power burner designed to burn natural or LP gas operates in the same manner. While a draft hood (diverter) is often used on gas units fired with an

atmospheric burner, a double-acting barometric draft control should be used for furnaces or boilers fired with power burners.

• Forced Draft Burners

Forced Draft installed with a stack height in excess of 30' will probably develop excessive natural draft, reducing the amount of pressure within the furnace or

boiler. A barometric draft control will help eliminate this undesirable stack action and permit the unit to be pressurized.

• Dual Fuel Appliances

Burners capable of burning either gaseous fuels or oil should be equipped with a barometric draft control. We suggest using a double-acting control on units

where fuels are frequently changed. The double-acting feature is important for gas-firing appliances, it allows spillage of combustion products in case of

blocked flues or down-drafts. To detect flue gas spillage on dual fuel installation, a Field Thermal Safety Switch is recommended.

• Gas-Fired Appliances

Gas-fired furnaces and boilers generally require a double-acting draft control. Like a single-acting control, it opens inwardly to maintain a uniform draft. But,

unlike a single-acting control, it is also free to open outwardly to spill the products of combustion, in case of blocked flues or down-drafts.

National codes often mandate the use of a draft control. Usage is generally limited to furnaces or boilers designed for use with power burners and incinerators.

Draft controls are generally used when oil-fired units are converted to gas.

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Summary of content (10 pages)

PAGE 1
FIELD CONTROLS, LLC - CONTRACTOR PRODUCTS DRAFT CONTROLS Draft Controls For proper operation and efficient fuel consumption in oil, gas and/or coal-fired heating appliances, draft must remain constant. When it is, combustion is more complete, fuels are utilized efficiently, and money is saved. Field Draft Controls maintain consistent draft by counteracting the negative forces caused by changes in temperature and barometric pressure, and the effects of wind.
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FIELD CONTROLS, LLC - CONTRACTOR PRODUCTS DRAFT CONTROLS BACK TO TOP How Draft Controls Work Static pressure of the cool air (1) exerts pressure on the outside of the furnace or boiler, the breaching, and stack. The pressure difference between the room air and heated gas (air) causes products of combustion (2) to flow (draft) through the unit and rise through the breaching and chimney.
PAGE 3
FIELD CONTROLS, LLC - CONTRACTOR PRODUCTS DRAFT CONTROLS Model Nominal Control Capacity Size Sq. In. Dia. Circum. A B C D E G H M 4" RC 4 12.6 3-4-5 9 1/2 to 15 3/4 4 2 1/2 2 2 5/16 4 9/16 1 2 1/2 7 5" RC 5 19.6 4-5-6 12 1/2 to 19 5 2 1/2 2 2 5/16 5 9/16 1 2 1/2 7 6" RC 6 28.3 5-6-7 15 3/4 to 22 6 1 7/8 3 6 5/8 1 2 3/4 7 5/8 7" RC 7 38.5 6-7-8 19 to 25 1/4 7 2 5/8 3 1/2 2 1/2 7 5/8 1 2 3/4 8 5/8 8" RC 8 50.3 7-8-9 22 to 28 1/8 8 4 3/8 9" RC 9 63.
PAGE 4
FIELD CONTROLS, LLC - CONTRACTOR PRODUCTS DRAFT CONTROLS Size RING GATE COLLAR 6" 24 26 26 7" 22 22 26 8" 20 20 24 9" 20 20 24 Recommended Pipe Sizes (in.) Model Nominal Control Capacity Size Sq. In. Dia. Circum. A B C 5 3 D E G M 2 8 6" M 6 28.3 5-6-7 15 3/4 to 22 6 7" M 7 38.5 6-7-8 19 to 25 1/4 7 5 1/4 3 1/2 3 3/4 7 3/8 2 1/4 8 3/4 8" M 8 50.3 7-8-9 22 to 28 1/4 8 6 3/8 3 3/8 8 5/8 3 10 3/8 9" M 9 63.
PAGE 5
FIELD CONTROLS, LLC - CONTRACTOR PRODUCTS DRAFT CONTROLS MATERIAL GAUGES Size RING GATE COLLAR 4" 24 24 26 5" 24 24 26 6" 24 24 26 7" 22 22 26 8" 20 20 26 9" 20 20 26 Recommended Pipe Sizes (in.) Model Nominal Control Capacity Dia. Size Sq. In. Circum. A B C D E F G H J K L M 4" MG1 4 12.6 3 - 4 9 1/2 to 12 1/2 4 2 1/2 2 2 5/16 4 9/16 1 1/2 1/4 2 1/2 1/2 1 1/4 3/8 7 5" MG1 5 19.
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FIELD CONTROLS, LLC - CONTRACTOR PRODUCTS DRAFT CONTROLS Type M+MG2 Solid, Oil or Gas Commercial/Industrial This is a series of compact, rugged, heavy-duty controls for use on large residential, commercial, and industrial applications. The Field Type M+MG2 Draft Control provides precise draft regulations for solid fuels, oil, gas, or oil/gas appliances requiring only the simplest, on-the-job adjustments depending on which fuel is to be utilized.
PAGE 7
FIELD CONTROLS, LLC - CONTRACTOR PRODUCTS DRAFT CONTROLS * CSA certified ** An increaser or reducer may be necessary in order for the Barometric Draft Control to adapt to off-sized pipe. MATERIAL GAUGES Size RING GATE COLLAR 10" 20 18 24* 12" 20 16 24* 14" 20 16 22* 16" 18 16 20* 18" 18 16 20* 20" 18 16 18* 24" 18 14 18* 28" 16 14 14** 32" 16 14 14** * Galvanized **HRPO with Enamel Finish BACK TO TOP Draft Controls (Installation Options) http://www.fieldcontrols.
PAGE 8
FIELD CONTROLS, LLC - CONTRACTOR PRODUCTS DRAFT CONTROLS Recommended Locations for Field Draft Controls For gas-fired equipment, the preferred location of the control is on the bull head tee. This location provides maximum relief of downdrafts with minimum positive pressure. (See Fig. 1, Dia. A-C) With oil or solid fuels, the bull head tee is not recommended, so instead, locate the control as shown. (See Fig. 1, Dia. D-J) These locations are acceptable for gas units as well.
PAGE 9
FIELD CONTROLS, LLC - CONTRACTOR PRODUCTS DRAFT CONTROLS Choosing The Right Size (Sizing the Control) Simple rules of thumb to guide size selections: 1. Use a draft control the same size as the flue pipe, that is, a 6" control for a 6" round pipe, a 12" control for a 12" pipe, etc. 2. For intermediate sizes of smoke pipe, use the next larger size draft control to provide ample capacity. It is a simple matter to install a round control on a pipe an inch or so larger or smaller than the control. 3.
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FIELD CONTROLS, LLC - CONTRACTOR PRODUCTS DRAFT CONTROLS 16 30' or less 16" 31'-50' 18" 51' or more 20" 17 30' or less 18" 31'-50' 20" 51' or more 20" 18 30' or less 18" 31'-50' 20" 51' or more 20" 19 30' or less 20" 31'-50' 20" 51' or more 24" 20 30' or less 20" 31'-50' 20" 51' or more 24" 21 30' or less 20" 31'-50' 24" 51' or more 24" 22 30' or less 24" 31'-50' 24" 51' or more 24" 23 35' or less 24" 36'-60' 24" 61' or more 28" 24 35' or less 24"