Compartment Thermal Switch (Electronic Key Pad Units Only)(17, Figure 6-5); Mechanical Timer (3, Figure 6-6); 3-Second Timer And Buzzer (Mechanical Timer Units Only)(11, 15, Figure 6-6); High Temperature Limit Switch (1, Figure 6-9) - Cleveland steamcraft 21-CET-8 Service Manual

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Figur 5-6. Mechanical Timer
Figure 5-7. 3-Second Timer and Buzzer
High Temperature Limit Switch
(1, Figure 6-9)
Float Assembly
(Figure 6-10)
• Pressing the START/STOP key halts the buzzer and resets the timer circuits
and display to the previously selected time.
• The CLEAR key resets the timer circuits to 00:00.
Compartment Thermal Switch (electronic key pad units only)
(17, Figure 6-5)
The compartment thermal switch delays timer countdown until
compartment temperature is above 190°F. This compensates for frozen or
partially thawed food. Opening the door during the cooking cycle also can
require additional cooking time. The compartment thermal switch controls
the pause circuit in the timer.

Mechanical Timer (3, Figure 6-6)

Operating the dial timer is explained in Chapter 3. After setting the dial, the
timed steaming cycle starts. Timer contacts L1-T1 dose to energize the
condenser solenoid and heater contactor. See Figure 5-6. Contacts L1-T3
open to enable the 3-second timer. When time elapses and the dial reads 0,
timer contacts L1-T1 open to deenergize the condenser solenoid and heater
contactor. Contacts L1-T3 dose to supply power to the 3-second timer and
buzzer.
3-Second Timer and Buzzer (mechanical timer units only)
(11,15. Figure 6-6)
The buzzer provides an audible signal to indicate completion of a timed
steaming cycle. With power applied across terminals 2 and 3 (see Figure 5-
7), the 3-second timer contact doses. This allows power flow through
terminals 1 and 2 to the buzzer. After 3 seconds, the 3-second timer contact
opens and silences the buzzer. The buzzer also sounds at the end of
MANUAL steaming when the operator sets the TIMED/MANUAL switch to
TIMED.
The high temperature limit switch operates to protect the heater coils from
overheating If the temperature near the heater element reaches 240°F, the switch
opens. This interrupts power to the heater contactor to prevent operation of the
heater element.
The float assembly monitors the water level in the steam generator, and controls the
fill valve and heater circuits accordingly.
Refer to Figure 5-3
. The float assembly is a sealed cylinder containing the float
switch assembly. The water line at the bottom of the cylinder connects to the bottom
of the steam generator. The pressure equalizing line at the top of the cylinder
connects to the top of the steam generator. These two lines accurately maintain the
same water level in the float cylinder as in the steam generator.
Model 21-CET-8 Service Manual Page 75
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