Burnham SM-6 manual Minimum Clearance to Combustible Surfaces

Figure 3

**A minimum of 24” from left side and front jacket panel is recommended for servicing.

MINIMUM CLEARANCE TO COMBUSTIBLE SURFACES

Minimum listed clearances from combustible materials for non-closet installation or closet installation. (See Figure 3).

Top — 6”	*Left Side —1”
Rear — 0”	Right Side — 1”
*Front — 2”	Flue — 0”
Floor — 6”

Since the above dimensions are measured between boiler jacket and combustible walls or ceiling, practical service clearances for all external adjoining equipment must be considered (see Figure 1). * A minimum of 24” from left side and front jacket panel is recommended for servicing.

In utility room installations, the door must be wide enough to allow boiler to enter or to permit replacement of another appliance in this room.

7VENTILATION AND COMBUSTION AIR. Provide provisions for combustion and ventilation air in accordance with Section 5.3, Air for combustion and ventilation, of the National Fuel Gas Code, ANSI Z223.1 or applicable provisions of local building codes. This boiler is equipped with a fan which produces

an induced draft through the unit. Combustion air is pulled in from outdoors and the flue gases are exhausted to the outdoors through the intake air/vent system. (See Figure 4).

a.Combustion air is provided 100% from the outdoors. Air is pulled in on all four sides of vent terminal cover, through the air intake duct and to the combustion area enclosure. The vent terminal must be mounted on a flat surface which is flush or protrudes outward from the exterior wall. Avoid recesses, niches or areas which might have reduced fresh air circulation.

b.Ventilation — When the boiler is installed in an unconfined space in a building of normal or unusually tight construction, there is no additional provision required to insure adequate air for ventilation of the jacket or control compartment.

When the boiler is installed in a confined space, two openings in a wall or door to an adjoining interior area which has adequate air supply shall be provided. One opening should be near the floor and the other near the ceiling. Each shall have a free area of not less than one (1) square inch for each thousand (1000) BTU input to all appliances in the boiler room. (See Figure 3).

8CONNECT GAS SERVICE from meter to gas control assembly in accordance with local piping codes and requirements of gas company, see Figure 1. They may require piping of larger size than 1/2” control assembly connection, especially if run from meter is long or includes several elbows.

This piping is to be supplied by the installer and must include a trap, a ground joint union and a manual shut- off valve upstream of the gas control assembly outside of the jacket when codes require, see Figure 1. A pipe thread compound resistant to the action of liquefied petroleum gases should be applied to all threaded joints in the gas piping. Pressure testing of the gas supply piping, boiler and its connections is required before placing the boiler in operation.

The boiler must be isolated from the gas supply piping system by closing the manual shut-off during any pressure testing at pressures equal to or less than 1/2 psig.

The boiler and shut-off valve must be disconnected from the gas supply piping system during any pressure testing at pressures greater than 1/2 psig.

RECOMMENDED SIZING OF GAS SUPPLY PIPING TO BOILER shall be such as to provide the required supply of gas without undue loss of pressure between meter and the boiler. Gas supply piping should be sized in accordance with Tables, I, II and III.

The following shall be taken into account:

a.Allowable loss of pressure to assure a burner manifold pressure of 3½” water.

b.Supply of gas to be provided in cubic feet.

c.Length of piping and number of fittings.

d.Specific gravity of gas.

e.Correction factor for specific gravity.

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