Vulcan-Hart VCE20F 126173, VCE20H 126172, VCE10H 126178 Steam Pre-Heat, Steam Regulation

ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

On 20 level machines (half and full size) the heating mode regulation is the same but with these additional points to remember:

Top and bottom heating elements operate independently and correspond to the top and bottom cavity temperature probes.

￿Display always shows the lowest temperature.

If the cavity temperature exceeds the set point temperature, the heating elements will not turn on until both cavity temperature probes sense a temperature below the set point.

Steam Pre-Heat

When the oven is turned on and the heating mode (convection or combi) is selected, the steam generator fills with water until the proper level is reached. On the programable oven control, press the Start/Stop key to begin oven heating. On the standard and deluxe manual controls, the water pre- heat begins after the heat selector knob is turned to either convection or combi mode. On initial start up only, after the cavity temperature reaches 1.8°F below set point temperature (convection = 1/4 power) the steam generator pre-heat begins. The steam generator heating elements then turn on for a total time of 1.5 minutes on 6 and 10 levels and 2.5 minutes on 20 level ovens, if they are on at full power only. When the convection heating elements turn back on (at half power) to maintain cavity set point temperature, the steam generator heating elements will also turn on (at half power), for a pre- heat time value that is automatically calculated. No additional heating of the steam generator takes place until either a steam or combi mode selection is made.

Steam Regulation

Before cooking in steam mode, it is recommended that the oven be pre-heated in convection mode at 200°F to bring the oven cavity up to temperature for immediate steam cooking.

Steam Mode - When the oven is turned on and the steam mode is selected, the steam generator fills with water until the proper level is reached. On the programable oven control, press the Start/Stop key to begin steam generator heating. The steam generator heating elements turn on (always at full power) until the actual set point temperature is reached then turn off. If the steam mode is selected after convection or combi mode heating, the steam generator pre-heat is complete and the oven is ready for steam mode cooking.

At this time, if the cavity temperature is lower than the set point, the steam generator heating elements turn back on until reaching the actual set point temperature then turn off. If the cavity temperature is higher than the set point, the steam generator heating elements remain off and the oven will go into cool down mode until reaching the set point temperature. When the cavity temperature falls 1°F or more below set point temperature, the heating elements turn on until the cavity returns to the actual set point temperature then turn off.

Combi Mode - On the programable and deluxe manual controls, the steam generator heating elements operate on a portion of the convection bake time to provide the oven with steam heat. The amount of steam introduced depends on the combi steam factor setting (1-6 LED’s lit) on the control. The default steam factor setting is 5 (1 LED lit). On the standard manual control, a fixed steam factor of 20 is used. When the steam generator elements are on at full power, the convection elements are off. If the convection heating elements are on at half power, the steam generator heat elements can also be on at half power. The toggling of the heating element power allows the current draw of the oven to remain at lower levels. If the oven set point temperature is less than the steam temperature setting (195°F to 212°F), the steam factor is limited to 10 regardless of the number of LED’s lit.

NOTE: The steam temperature setting (boiling point adjustment) for elevation is pre-selected in the configuration mode.

Indicator Lights	Steam	Seconds	Seconds
(on front panel)	Factor	ON	OFF
1	5	5	85
	10	5	70
2	20	5	55
	30	5	40
￿￿￿￿￿￿	40	5	25
	50	5	10

NOTES: 1. Default on Programmable and Deluxe manual controls.

2. Default on Standard manual control and is non- adjustable.

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