4)
Insulation Test: After oven has been maintained at a
temperature of 260 C (500 F) for a minimum of two hours, the
average temperature of the combined external surfaces should
not exceed 13 C (25 F) above ambient temperature. Any
noncompliance shall constitute failure of this test.
5)
Heat-up, Ventilation and Cooling Tests: Locate three
thermometers or thermocouples of known accuracy on an oven tray,
one in the center, and one at each end. With the oven empty, at
room temperature and door closed, fire the oven. Check for a
temperature rise of 190 C (375 F) in 1 hour, maximum, for
gas-fired ovens and electric ovens. Raise oven temperature to
285 C (550 F) and check the cooling rate. The oven(s) should
cool at a minimum rate of 28 C (50 F) in 30 minutes with normal
ventilation and door open. Any nonconformance should constitute
failure of this test.
Uniform Temperature Test: With a thermostat setting of 205 C
6)
(400 F), check the reading of the three thermometers or
thermocouples used in the "Heat-up, ventilation and cooling
tests" for uniformity. The difference between the three
readings shall not exceed 3 C (6 F). Readings should be taken
when tray is at the door opening. Any nonconformance should
constitute failure of this test.
7)
Mechanical Operation Tests: Operate the oven reel in forward
and reverse rotation and check operation of drive transmission
components and lack of coasting, backlash or vibration in reel.
Turn the reel, using the hand crank. The force required to turn
the reel should not exceed 4.5 kg (10 pounds). Check spiders
for reinforcements and free and unbinding operation of spiders
and linkages. Any nonconformance should constitute failure of
this test.
Safety Test (Gas-fired Ovens): With the oven set at 95 C to
8)
205 C (200 F to 400 F) raise the setting of the thermostat
above the reading of the indicating thermometer. Extinguish
the pilot flame to determine if the electronic flame failure
protection system controlling the main gas supply will sound a
continuous alarm and stop the flow of gas 2 to 4 seconds after
flame failure. Any nonconformance should constitute failure of
this test.
9)
Tray Load Test: Load each tray with a uniformity distributed
load of 1.2 kPa (25 pounds per square foot) and rotate reel for
one hour at 230 C (450 F). With trays stationary, observe
each.
10) Certification Compliance Examination: Certifications, certified
for codes and standards, as applicable, should be examined and
validated as proof of compliance.
a)
Ovens should conform to the following standards:
-
National Sanitation Foundation (NSF)
-
American Society for Testing and Material (ASTM)
-
Underwriters Laboratories (UL)
-
American Gas Association (AGA), Gas fired ovens.
b)
Conformance to these standards should be evidenced by seal,
label, stamp or certified test reports.
G.
Convection Ovents (Electric and Gas):
11410.12
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