WW-F-2743A
3. REQUIREMENTS
3.1 Description. The furnaces and unit heaters shall be self-contained, indirect, oil- or gas-fired, forced-air, heating appliances as follows:
a. Type I central furnaces shall be designed to supply heated air through a duct system.
b. Type II space heaters may be similar to type I units except that the type II heaters shall be equipped with nozzles. The nozzles may be direct-diffusion, rotatable, sheet metal, or louvered nozzles. The nozzles shall be designed to discharge a stream of heated air along a preselected path directly into the space in which the heater is located.
c. Both the furnaces and unit heaters shall consist essentially of the following: (1) A heat exchanger.
(2) Burner.
(3) Centrifugal blower (s) or propeller fan(s), as applicable.
(4) A sheet metal cabinet-type casing with provisions for duct, discharge-nozzle, or louvered connection.
(5) All required operating, limit, and safety controls.
d. The furnaces and heaters shall be completely factory-assembled and wired. The following components may be packed separately at the option of the supplier provided such components accompany the basic unit in shipment:
(1) Oil burners.
(2) Blower assembly.
(3) Discharge nozzles and plenum extensions for type II units. (4) Air filter boxes, if furnished.
(5) Any other accessories normally shipped disassembled from the unit such as induced draft fan and thermostat.
3.1.1 Upflow unit. An upflow unit shall be designed with air flow discharge, vertically upward, at or near the top of the unit. Upflow, high-boy units shall be arranged with the blower mounted below or adjacent to the heating element. Upflow, low-boy units shall be arranged with the blower mounted beside the heating element. On the low-boy units, both the return air and discharge air connections shall be located on the top of the unit. Type II unit heaters covered by this paragraph shall be of the upflow, high-boy design only.
3.1.2 Downflow unit. A downflow unit shall be designed with the air flow essentially in a vertical path wherein the air discharges downward at or near the bottom of the unit. Downflow unit shall be type I, group 1 only and shall be suitable for alcove or closet installation in residential structures.
3.1.3 Horizontal unit. A horizontal unit shall be designed basically for low headroom installation with the air flow through the heating element of the unit essentially in a horizontal path. Type II units of the horizontal style shall be equipped, when required, with suitable hangers for horizontal mounting.
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