Bosch 300 Series Service Manual - Page 5

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Table 3 Element duty cycles during preheat by cavity type.

2.1.1 Using Table 3 (Element Duty Cycles During Preheat)

In Table 3, Duration is defined as the number of seconds an

element is turned on (e.g., 12 indicates the element will be on for 12

seconds.) Start Point is defined as the point in the cycle at which the

element will turn on (e.g., 30 indicates the element will turn on in the

second of the cycle).

Using the data in the table, below is an example of how the elements

cycle on and off during a 60-second Preheat cycle in True

Convection mode (see Cavity C):

HBL8450UC built in 01/2008 (see columns labeled -1-)

•

Bake Element: After initial 30 seconds of the cycle, element

turns on and remains on for the final 30 seconds of the cycle.

•

Ring Element: After initial 30 seconds of the cycle, element

turns on and remains on for the final 30 seconds of the cycle

(same as Bake Element).

•

Broil Element: Turns on at the beginning of the cycle (0) and

remains on for the first 30 seconds of the cycle.

HBL8450UC built in 08/2008 (see columns labeled -2-)

•

Bake Element: After initial 33 seconds of the cycle, element

turns on and remains on for the final 27 seconds of the cycle.

•

Ring Element: After initial 36 seconds of the cycle, element

turns on and remains on for the final 24 seconds of the cycle.

•

Broil Element: Turns on at the beginning of the cycle (0) and

remains on for the first 27 seconds of the cycle.

In Fast Preheat (available in cavities B and C with convection fan), the

same elements reflected in the table are used, but the broil element is

on ~10% longer, and the convection fan stays on as well.

It is important to note that during regulation (regular cooking period

that follows Preheat), different elements may be used and element

duty cycles will vary.

2.2

Figures 2 – 5 reflect the sequence of events which occur during

Preheat for the various cooking modes.

Service Manual for Bosch Built-in Wall Ovens

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