Models 24-CGA-10 and 24-CEA-10
Page 74
SteamCraft 10 Service Manual, Chapter 5
The heating components cycle
with the Preheat Thermostat
T'stat OPEN - Heater OFF
T'stat CLOSED - Heater ON
A:
B:
Steam Generator Preheating
Refer to Figure 5-3. The preheat cycle warms the water in the steam
generator to 185°F. It automatically holds that temperature until the steaming
cycle starts.
A. When the ON/OFF switch is first set to the ON position, the preheat circuits
are energized. However, while the water in the steam generator is below
the safe operating level, the heating components do not turn on.
B. When a safe operating level is reached, the heating elements or heat
exchanger tubes are covered with water. The lower float switch closes and
activates the heating components. Heating continues until the water
temperature in the generator reaches 185 F.
C. When the water temperature reaches 185°F. the preheat side of the
preheat thermostat switch opens and the heating components turn off. The
switch closes and restarts the heating components when the water
temperature drops below 185 F. This preheating cycle continues
simultaneously with the water filling cycle until the steaming cycle starts or
the ON/OFF switch is set to the OFF position.
• The gas-fired Model 24-CGA-10 has one steam generator which supplies
steam to either or both cooking compartments. The ON/OFF switch initiates
the fill and preheat cycles. The preheat cycle stops when the ON/OFF
switch is set to OFF, or when the control panel of either cooking
compartment starts the steaming cycle.
• The electric heater Model 24-CEA-10 has a steam generator for each
cooking compartment. Unless the ON/OFF switch stops operation of both
generators, each independently continues the fill and preheat cycles until its
associated compartment control starts the steaming cycle.
The heating components
turn on when water is above
the Lower Float Switch.
c
:
Figure 5-3. Steam Generator Preheating
Preheating does not start
until the water has reached
the Safe Operating Level.
