MSS-200 MINI SPATULA STEAMER
18
P/N 1010903 Rev. A 09/05
TEMPERATURE/STEAMING THEORY
When the Rocker Switch (Power On/Off) is ON, line
voltage flows to the primary side of the step down
transformer. The transformer’s secondary side supplies
12 VAC to terminals T1 and T2 of the multifunctional
temperature Control Board.
Once powered, and provided that the Generator surface
temperature is below 375° F (190° C), the multifunction-
al temperature Control Board calls for heat by energiz-
ing its on board mechanical relay. Once energized, the
mechanical relay closes its contacts, which allows line
voltage to flow to the Generator.
As the generator begins to heat up, a 100 k ohm
Thermistor monitors the internal Generator tempera-
ture. As the heat continued to increase, the thermistor’s
ohms begin to decrease. As the internal Generator
temperature approaches 375-390° F (190-198° C), the
Thermistor is generating approximately 790-665 ohms.
The multifunctional temperature Control Board receives
these ohms and then de-energizes the mechanical
relay since the heating circuit is satisfied. Then, the
mechanical relay contacts open, and the Generator
stops heating.
The heating circuit cycles on and off as needed, even
at idle. Once the Generator is up to temperature (a
state indicated by a steady blue light), and if the Steam
Switch is pressed and released to initiate a steam
cycle, the Steam Switch contacts close momentarily to
complete a circuit to terminal J4 on the multifunctional
temperature Control Board.
Simultaneously, the blue light turns off, and the mul-
tifunctional Control Board supplies line voltage to the
Solenoid Valve Coil for a split second. The Solenoid
Valve opens ad allows approximately 2-3 tablespoons
of water to be disbursed onto the Generator surface for
steaming. The water flashes into steam immediately
and steams the product.
After approximately 10 seconds, the blue light turns
back on to indicate that the unit is ready for another
cycle.
The multifunctional Control Board incorporates two sta-
tus LEDs detailed below. If the heating circuit continues
to call for heat and the Generator overheats, an auto-
matic resetting Hi-Limit Thermostat will trip and open
the generator circuit and transformer circuit at approxi-
mately 450-470° F (232-243° C).
NOTE: If this condition should repeat, the root
cause must be determined and corrected.
NOTE: The MSS-200 Mini Spatula Steamer is
shipped with a dual Water Pressure Regulator
assembly. The primary water pressure regulator is
fixed at 30 PSI and is not adjustable. The second-
ary water pressure regulator is factory set and
should remain set between 7-9 PSI. It should only
be momentarily adjusted if required as per the
Maintenance Section of this manual.
LED Function
The following LEDs are viewed from the rear of the unit.
Yellow (Heat):
When lit, it indicates that the unit is in
heat mode. During this time, line voltage is being sup-
plied to the generator. When off, it indicates that the
generator is up to operating temperature.
NOTE : This LED will cycle on and off even at idle.
Green (Solenoid Valve):
When lit, it indicates that the
line voltage is momentarily being supplied to the sole-
noid valve coil.
NOTE: This LED is only lit for a split second.
The following provides unique features involving the
blue light. These are handy for troubleshooting pur-
poses.
During cold start up, the blue light remains off (indicat-
ing that the generator is not up to temperature). During
this time, the solenoid valve circuit is disabled and the
unit will not initiate a cycle even if the steam switch is
pressed.
Within 5 minutes after cold start up, the blue light will
TECHNICAL THEORY OF OPERATION
