WW-F-2743 Furnaces, Warm Air and Heaters, Unit, Forced Air Circulation, Oil - and Gas FiredThis specification covers self-contained, forced-circulation, air heating units designed to distribute warm air for heating purposes either through a duct system for central furnaces or by direct diffusion for unit heaters.

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WW-F-2743A

6.5  Part or identifying number (PIN).  The specification number, type, style, group and burner are combined to form PINs for furnaces covered by this document (see 1.2).  PINs for the furnaces

are established as follows:

WWF2743       X    X    X     X

Federal Specification number

Type (see 1.2.1) Style (see 1.2.1) Group (see 1.2.2) Burner (see 1.2.3)

6.5.1  Cataloging data.  For cataloging data purposes, PIN code numbers for styles are assigned as follows:

1 = Type I

2 = Type II

A = Style A B = Style B C = Style C D = Style D

1 = Group 1

2 = Group 2

3 = Group 3

1 = Burner L0-1

2 = Burner G-2

3 = Burner H0-3

4 = Burner GL0-4

5 = Burner GH0-5

6.6  Subject term (key word) listing.

Casing

Heat transfer rate

Ignition systems

0utput capacity Temperature rise Thermostatic switches

6.7  Changes from previous issue.  Marginal notations are not used to identify changes with respect to the superseded document.

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