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MODEL C24EA - ELECTRICAL OPERATION
F25213 (May 2006)Page 43 of 52
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.