Vulcan-Hart C24EA3 208/240V BASIC, C24EA5 480V BASIC, C24EA5 480V PRO Professional Model

MODEL C24EA - ELECTRICAL OPERATION

B.Time delay relay is energized through

terminals 2 & 3 for set time (90 seconds). Output (120VAC) on terminal 1.

C.Time delay relay output energizes K3 coil.

1)X1 potential to L1 of WLC board through N.O. contacts K3-5/3

2)LLCO relay K2 coil energized through closed N.O. contacts K3-5/3, WLC board N.O. contacts LLCO and N.O. contacts K3-6/4.

a.Drain Flush Solenoid enabled by closure of N.O. contacts K2-3/5.

3)Heating element and timer control circuits are disabled by opening of N.C. contacts K3-6/2.

15.Condensate Thermostat reaches 135E F cut-in temperature, contacts close. Drain water temperature is regulated through condensate thermostat.

A.Cooling Solenoid and Drain Flush Solenoid energized through cycling of Condensate Thermostat.

16.Tank water level drops below L probe.

A.Internal latching relay (ILR) de-energizes.

1)High level coil (HL) energized on WLC board. HL LED on WLC board lights.

17.Tank water level drops below LLCO probe.

A.LLCO relay K2 de-energized through opening of WLC board LLCO N.O. contacts.

1)Drain Flush Solenoid energized through N.C. contacts (K2-6/2).

2)Flush/Fast Fill Solenoid energized through N.C. contacts K2-6/2 and K2- 5/1.

3)Vacuum Relief Solenoid is energized through closed N.O. contacts K2-2/6.

18.Time Delay Relay time elapses.

A.Power (120VAC) removed from output of Time Delay Relay terminal 1.

1)All solenoids, coils and WLC board are de-energized.

Professional Model

1.Conditions

A.Steamer connected to correct voltage.

1)120VAC potential across X1 & X2 on secondary side of main transformer.

B.Steamer connected to water supply with correct water requirements.

C.Power switch is in off position.

1)Time delay relay timed out. Timer has no output on terminal 1.

D.Condensate thermostat is open.

E.High limit thermostat closed.

F.Pressure switch is closed.

G.Hold thermostat open.

H.Drain closed and steam generator tank (referred to as tank) is empty.

I.Steamer door open.

J.Timer is off.

K.Water level control (WLC) and tank properly grounded.

2.Power switch (1S) is turned on.

A.Power light (3LT - Amber) illuminates.

B.X1 potential to L1 of WLC board.

1)120VAC across L1 & L2 of WLC board.

2)High level coil (HL) energized on WLC board. HL LED on WLC board lights.

C.Fast Fill Solenoid (3SOL) energized through N.C. contacts K3-1/5, N.C. contacts WLC (LLCO) and N.C. contacts K2-5/1. Tank begins to fill with water.

3.Water level reaches Low Level Cut-Off (LLCO) probe.

A.LLCO coil is energized. LLCO LED on WLC board lights.

B.LLCO N.C. contacts open de-energizing Fast Fill Solenoid.

C.LLCO N.O. contacts close enabling timer and heating element circuits.

4.Limiting contactor coil energizes.

5.Regulating contactor coil energizes through N.C. contacts K1-1/5. Power to heating element. Tank water heats.

6.Tank water reaches 195E F. Hold thermostat contacts close.

A.Slow Fill Solenoid is energized through closure of Cycling Thermostat (3TAS) and closed WLC (HL) N.O. contacts. Tank continues to fill.

B.Relay K1 energizes. Timer circuit is enabled through closure of N.O. contacts K1-6/4 and K1-5/3.

1)Ready light (1LT - Green) illuminates.

2)Relay K4 energizes.

a.Super Heater energizes through closure of N.O. contacts K4-6/4.

b.Ready light (1LT - green) lights.

c.Latch circuit is completed by closure of N.O. contacts K4-5/3.

C.Temperature in tank is maintained at

195E F by Cycling Thermostat control of regulating contactor through N.C. contacts K1-1/5.

7.Water level reaches Low level (L) probe.

Page 43 of 52 F25213 (May 2006)