Electrical Operation; Component Function Steam Generator Controls - Vulcan-Hart C24EA Series Service Manual

C24EA SERIES ELECTRIC CONVECTION STEAMERS - ELECTRICAL OPERATION

COMPONENT FUNCTION STEAM GENERATOR CONTROLS

Water Level Control
(WLC) . . . . . . . . . . . . . . . . .
Probe (H) . . . . . . . . . . . . .
Probe (L) . . . . . . . . . . . . . .
Probe (LLCO) . . . . . . . . .
Contactor, (1CON)
Limiting . . . . . . . . . . . . . . .
Contactor 1, (2CON)
Regulating . . . . . . . . . . . .
Contactor 2, (3CON)
Regulating . . . . . . . . . . . .
Elements, Heating . . . .
Elements, Heat
Exchanger . . . . . . . . . . . .
Fuse, (1FU & 2FU) . . . .
Relay, Time Delay
(TDR) . . . . . . . . . . . . . . . . .
Solenoid (1SOL), Drain
Cooling . . . . . . . . . . . . . . .
Solenoid, (2SOL)
Cavity Condensate . . .
Solenoid (3SOL), Fast
Fill/Flush . . . . . . . . . . . . . .
Solenoid (4SOL), Slow
Fill . . . . . . . . . . . . . . . . . . . .
Solenoid (5SOL),
Vacuum Relief . . . . . . . .
Solenoid, Drain Valve
(N.C.) . . . . . . . . . . . . . . . . .
Solenoid, Delime
Valve . . . . . . . . . . . . . . . . .
Switch (1PAS),
Pressure . . . . . . . . . . . . . .

ELECTRICAL OPERATION

Controls water level by monitoring conditions of the three water level probes H, L and
LLCO.
High water level probe connected to internal latch relay circuit on WLC. Water must reach
this level before internal latch relay is energized.
Low water level probe connected to internal latch relay circuit on WLC.
Low Level Cut-Off (LLCO) probe connected to WLC. Controls power to heating and fast
fill/flush solenoid.
Connects one side of heating elements to power. Energized whenever WLC (LLCO) coil
is energized.
Connects heating elements to power. On constantly when one or both cooking
compartment timers are set.
Connects heating elements to power. On constantly when both cooking compartment
timers are set.
Located in steam generator. Heats water to produce steam.
Two cartridge type heating elements located in the heat exchanger. Provides additional
energy to raise the steam temperature delivered to the cooking compartments.
Slow blow 3A fuse. Located on primary side of main transformer (1T). Protects control
circuitry from over-currents.
Controlled by delime switch for delime cycle only. Power switch must be off and delime
switch pressed and held for more than 2 seconds to activate time delay relay output and
start delime cycle. iTime delay prevents the delime cycle from immediately starting - if
the delime switch is accidentally pressed.
Controlled by the condensate thermostat. Mixes cold water with hot drain water from
steam generator to reduce water temperature at the drain.
Controlled by cavity relay K8 on control board. Solenoid is energized when timer is on.
Mixes cold water with hot condensate water from cooking compartment to reduce water
temperature at drain.
Initial steam generator fill. Also used during last stage of drain cycle to flush drain opening
free of debris.
Secondary steam generator fill. Energized as necessary to replenish water in steam
generator.
Provides open air line to steam generator during filling and draining. When generator is
draining, keeps a vacuum from developing to prevent cooking compartment flex; and
allows faster draining. When generator is filling, keeps pressure from building up to allow
the generator to completely fill.
Controlled by delime relay K7 and delime circuit operation. When energized by 24VAC,
valve opens to drain the steam generator.
Controlled by delime relay K7 and drain circuit operation. When energized by 24VAC,
valve opens to allow deliming of the heat exchanger and elements during a delime cycle.
Pressure cut-out protection. Range is 3.0 to 3.7 psi. Removes power from heating circuit
if steam generator pressure rises above the pressure switch setting.
Page 53 of 75 F35453 Rev. A (0119)