Pressure Switch
The pressure switch controls the steam pressure in the rear boiler by opening and closing the elec-
trical circuit to the heating element.
* The pressure switch receives power generally to the bottom set of input leads. When the steam
pressure lowers in the boiler (usually .9 to 1.0 bar) the contacts close allowing power to
flow from the bottom leads through to the top leads and then to the heating element.
* As the steam pressure rises and reaches 1.2 bar the contacts open and cut the power to the heat
ing element.
Quick Guide to Testing Electronic/Electrical Components
Capacitor
Set your multi-meter to its highest ohms setting. Place your leads on the
capacitor terminals. The tester’s display should read a value that rapidly
decreases then suddenly begins increasing after reaching zero, now reverse
the leads on the capacitor, if the same decreasing then increasing readout
occurs the capacitor is good.
Flowmeter
1.8--2.4k Ohms between the “-” and “+” terminals means field is good.
Solenoid Coils
.7 - .8k Ohms between terminals means coil is good.
Fuses
Continuity between fuse ends means fuse is good.
Pressure Switch
110v between top and bottom terminals while contacts closed means switch
is good.
Heating Elements
Appropriate amp draw while pressure switch closed means element is good.
Rocker Switches
0 Ohms reading from top to bottom means switch is good.
Sirai Pressure Switch
Controls pressure and takes
the amp load of power to the
heating element.
Giemme Pressure Switch and Contactor
Controls pressure by opening and closing the contactor, which
sends power to the element and carries the amp load.
