WW-F-2743A
to comply with specified requirements, or any necessary redesign or modification following failure to meet specified requirements shall receive particular attention for adequacy and suitability. This element of inspection shall encompass all visual examinations and dimensional measurements. Noncompliance with any specified requirements or presence of one or more defects preventing or lessening maximum efficiency shall constitute cause for rejection.
4.3.1 Standards compliance. The contractor shall make available to the contracting officer or his authorized representative evidence of compliance with the applicable standard(s) specified in 3.7. The Government reserves the right to examine and test all units to determine the validity of the certification.
4.4 First article test. When a first article is required (see 3.3), the first furnace shall be subjected to the tests by the contractor as specified in 4.4.1 through 4.4.6. Failure to pass any phase of the required tests shall be cause for the Government to refuse acceptance of all furnaces until corrective action has been taken.
4.4.1 Operational test. The first article shall be subjected to an operational fire test to verify the functional adequacy of burners, blowers, and controls. The furnace shall be set up with the test duct as specified in the applicable UL or ANSI standard to maintain the required external static test pressure. The furnace shall be operated sufficiently to ensure equilibrium is established with the air-flow rate adjusted to give the rated outlet temperature of 85 F (29 C) rise or as required in the contract. Under these conditions, the furnace shall operate continuously at rated thermal input without interference from the limit control. After the initial test period, the limit control cutout point shall be checked as prescribed in UL 727, UL 731, UL 795, ANSI Z21.47, or
ANSI Z83.8. During the operational test, the ignition system shall be checked for proper light-
off, the burner flame observed for proper shape, color, or excessive smoking, and the blower control checked for proper setting.
4.4.2 Flame safeguard test. After completion of the test of 4.4.1, the flame safeguard control on the sample test furnace shall be tested for tightness by manually closing the main fuel supply valve to simulate a flame failure. The time required for safety shutdown of the furnace shall be checked for requirements of 3.14.4.
4.4.3 Heat exchanger tightness test. During or after the test of 4.4.1, the heat exchanger on the sample test furnace shall be tested for tightness. The test may be conducted by introducing a fuming or smoking material into the combustion chamber, by taking comparative carbon dioxide readings at two different external static pressures, by pneumatic pressure tests conducted prior to final assembly of the units, or by an equivalent method normally used by the manufacturer.
4.4.4 Efficiency. The furnace shall be tested to verify compliance with the thermal input of 3.8.1 and the efficiency requirements of 3.8.2. Efficiency tests shall be conducted only after satisfactory completion of the tests of 4.4.1, 4.4.2, and 4.4.3. During the tests, the stack temperature and smoke reading shall also be recorded. Tests shall be conducted as follows:
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