Cooking Compartment Controls - Vulcan-Hart MHB24E Service Manual

Supply Voltage Transformer . . . . Provides 120VAC to the boiler control and cooking compartment control
Cycling Contactors B & D . . . . . . Supplies line voltage to one side of heating elements thru cycling pressure
Auxiliary Contactors A & C . . . . . Supplies line voltage to energize the heating elements thru relay K3 & K4
Heating Elements . . . . . . . . . . . . . Heats water in boiler to generate steam.
Blowdown/Drain
Solenoid Valve . . . . . . . . . . . . . . . N.O. valve that closes when energized by the power switch to allow boiler to
The upper section of the steamer consists of two separate cooking compartments. Each compartment functions
independently with its own set of controls. Power is supplied to the controls only after the steam pressure rises
above the compartment pressure switch setting to close the N.O. contacts.
Ready Light (Green) . . . . . . . . . . . When lit, indicates steamer is ready to cook.
Cooking Light (Red) . . . . . . . . . . . When lit, indicates steamer is in a cooking cycle.
Cooking Timer . . . . . . . . . . . . . . . Use to set cooking time between 0-60 minutes. When timer is set, energizes
Buzzer . . . . . . . . . . . . . . . . . . . . . . Signals end of a cook cycle, must be turned off manually.
Door Switch . . . . . . . . . . . . . . . . . Removes power to cooking timer. If time is dialed on cooking timer and
Steam Solenoid Valve . . . . . . . . . When energized, opens to allow steam into the cooking compartment
Compartment Pressure Switch . . Supplies power to cooking compartment controls, after steam pressure rises
VHX SERIES STEAMER - ELECTRICAL OPERATION
circuits.
switch N.C. contacts and LLCO-1 N.O. contacts.
N.O. contacts.
fill and pressurize. When de-energized, valve opens to blowdown and drain
the boiler contents.

COOKING COMPARTMENT CONTROLS

the steam solenoid valve to allow steam into the cooking compartment.
When time expires, energizes buzzer until turned off.
compartments are steaming, removes power to steam solenoid valve when
compartment door is opened.
(normally closed valve).
above approximately 3 psi to close the pressure switch. The pressure switch
remains closed as long as steam pressure is above the stated pressure.
Page 25 of 48 F25154 (February 2004)