WW-F-2743A
6.2 Acquisition requirements. Acquisition documents should specify the following:
a. Title, number, and date of this specification.
b. Type, style, group, and burner type required; type of gas for burner types G, GLO, and
GHO (see 1.2.1, 1.2.2 and 1.2.3).
c. When a first article is required (see 3.3 and 4.2.1). d. Thermal input required Btu/hr (W) (see 3.8.1).
e. When efficiency, output capacity, and temperature rise will be other than as specified
(see 3.8.2, 3.8.3 and 3.8.4).
f. When external static pressure and air flow (cfm) other than rated will apply (see 3.8.5). g. When installation clearances will be other than as specified (see 3.9).
h. When other than the manufacturer's standard rack or filter retainer is required for air filters for group 1 units. When group 2 and group 3 units are to be provided with integral racks or auxiliary boxes (see 3.9.1).
i. When discharge nozzles or deflectors hood are required (see 3.9.2). J. When automatic vent damper device is required (see 3.9.3).
k. Heating value and supply pressure for gas-fired units if other than natural gas will be used;
altitude at which gas-fired units will operate if above 2,000 feet (see 3.11.2).
l. When blower speeds on units will be adJustable and with number of speeds (see 3.13). m. When group 3 units will be equipped with high-low-off controls or modulated controls
(see 3.14).
n. When a thermostatic switch is required. Selector positions for system selector switch and fan selector switch, if other than as specified (see 3.14.1).
o. When an oil delay valve is required on oil fired units (see 3.14.5).
p. Required electrical characteristics of motors and when other than drip proof motors are required (see 3.15.1).
q. When other than NEMA type 1 enclosures are required for magnetic starters (see 3.15.2). r. For group 3 units, when other than NEMA type 1 enclosures are required for the control
panel (see 3.15.3).
s. When induced draft fans are to be furnished (see 3.16.1).
t. When vent connections are required for space heaters (see 3.16.2).
u. When both a draft regulator and vent connections are required (see 3.16.3).
v. When treatment and painting procedures will be other than manufacturer's standard practice (see 3.17).
w. When lubrication will be different (see 3.18).
6.3 First article. When a first article inspection is required, the item will be tested and should be a first article sample, or it may be a standard production item from the contractor's current
inventory as specified in 4.2.1. The first article should only be required when compliance with the applicable standards cited in 3.7 or certification specified in 3.7 are not made available. The contracting officer should include specific instructions in acquisition documents regarding arrangements for examination, test, and approval of the first article.
6.4 Classification cross reference. Classifications used in this specification (see 1.2) are identical to those found in the superseded Federal Specification WW-F-2743.
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