Condenser Solenoid Valve (1, Figure 6-11); Timer; Electronic Key Pad Timer (3, Figure 6-5) - Cleveland steamcraft 21-CET-8 Service Manual

Page 74 Model 21 -CET-8 Service Manual
Condenser Solenoid Valve
(1, Figure 6-11)

Timer

The condenser solenoid valve controls cold water flow to the condenser tee at the
bottom of the unit. The valve injects cold water into the condenser to cool the vapor
and fluid draining from the steamer. This reduces pressure in the compartment drain.
Low pressure in the drain maintains optimum performance of the steamer. With a hot
or warm water supply connected to the condenser solenoid valve, the condenser
"WILL NOT function properly, and equipment damage may result.
The condenser solenoid valve energizes when the heater contactor energizes. The
condenser solenoid and heater contactor energize through the TIMED/MANUAL
switch.
• During manual operation (TIMED/MANUAL switch set to MANUAL), the
condenser solenoid and heater contactor energize directly through the
TIMED/MANUAL switch.
• During timed operation (TIMED/MANUAL switch set to TIMED), the condenser
solenoid and heater contactor energize through the timer control.
• In units with an electronic key pad timer, setting the timer for more then 00:00 and
pressing the START/STOP key energizes the condenser solenoid. When the timer
counts down to 00:00, timer contacts open to deenergize the solenoid and open the
valve.
• In units with an mechanical dial timer, setting the dial to a time greater than 0
closes contacts L1-T1 energizing the solenoid. When the time elapses and the dial
points to 0, timer control contacts L1-T1 open to deenergize the condenser
solenoid and open the valve.
The timer controls the condenser solenoid and heater contactor during timed
operation (the TIMED/MANUAL switch in the TIMED position). In timed mode,
the timer starts and stops the SteamCraft 3.1 steaming cycle automatically. The timer
circuit is slightly different for electronic key pad timers and dial timers.
Electronic Key Pad Timer
(3, Figure 6-5)
Operating toe electronic key pad timer is explained in Chapter 3. After setting the
steaming time and pressing the START/STOP key, the steaming cycle starts.
1. Contacts in the timer dose to energize the heater contactor and condenser
solenoid.
2. While the compartment temperature is lower than 190 F, the timer pause circuit
delays the countdown. PAUS and the set time alternately display on the panel.
3. When the compartment temperature rises above 190 F, the compartment thermal
switch closes and the timer begins to count down, as indicated on the panel
display.
4. When the timer counts down to 00:00, timer contacts open to deeenergize the
heater contactor and condenser solenoid. The panel buzzer sounds to indicate the
end of the steaming cycle.
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