Vulcan C24EA6 User Manual download pdf (Page 47)

MODEL C24EA - ELECTRICAL OPERATION

F35453 (July 2008)Page 47 of 68

Solenoid, Delime Valve .................. 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.

Switch (1PAS), Pressure ................. Pressure cut-out protection. Range is between 4.5 to 4.7 psi.

Removes power from heating circuit if steam generator pressure

rises above the pressure switch setting.

Switch (2PAS), Pressure ................. Vacuum and fill pressure sensing for the steam generator.

When generator is draining, provides power to vacuum relief

solenoid to prevent a vacuum from developing in the steamer.

When generator is initially heating and pressurizes above 4"

W.C. the pressure switch opens to remove power from vacuum

relief solenoid to allow generator to reach operating pressure.

Thermostat (1TAS), Condensate ........... Monitors temperature of water entering the facility drain system.

Controls the drain cooling solenoid during cooking operation and

drain cycle (130EF close).

High-Limit (2TAS), Steam Generator ....... Protects steam generator heating elements from over-

temperatures. Capillary tube device (257EF cut-out; 246°F auto

reset).

High-Limit (3TAS), Heat Exchanger ........ Protects heat exchanger elements from over-temperatures.

Surface mount device (500EF cut-out; auto reset 450°F).

Transformer (1T), Main .................. Step down transformer from line voltage to 120VAC control

circuit voltage.

Relay, Heat Exchanger (K10) ............. Connects heat exchanger element (1) to power. On constantly

whenever one or both cooking compartment timers are set.

Relay, Heat Exchanger (K12) ............. Connects heat exchanger element (2) to power. On constantly

whenever both cooking compartment timers are set.

Control Board .......................... Controls steam generator operation, draining and deliming

functions. Provides a central location for wire harness

connections and power transfer thru board relays K1 thru K9

and K11 to the steamer controls. Houses 18 LED's for visual

operation status and troubleshooting.

NOTE: The relay’s below are mounted on the control board and are individually replaceable.

Relay (K1) ............................. Controlled by pressure switch (1PAS). K1 relay is energized

when the pressure switch N.O. contacts close.

Relay (K2), Delime ...................... Controlled by delime circuit. K2 relay is energized when delime

switch is turned on (momentary).

Relay (K3), Drain Relay .................. Controlled by drain time delay relay. K3 relay is powered when

power switch is turned off and drain time delay is energized for

the drain cycle.

Relay (K4), Delime ...................... Controlled by delime circuit. K4 relay is energized when delime

switch is turned on (momentary).

Relay (K5) ............................. Controlled by delime circuit. When delime valve is energized,

the delime valve end switch contacts close and K5 relay is

energized.

Relay (K6) ............................. Controlled by delime switch. K6 relay is energized when delime

switch is turned to CANCEL to stop a delime cycle.

Relay (K7) ............................. Controlled by delime circuit. K7 relay is energized when delime

time delay relay 1 is energized during delime cycle.

Relay (K8), Cavity ...................... Controlled by upper cooking compartment timer. When timer is

set, K8 relay is energized and K8- 5/3 contacts close to provide

power to cavity condensate solenoid and heat exchanger relay

(K10). Heat exchanger element (1) energized.

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Vulcan C24EA6 User Manual Page 47

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