Repair manual

SERVICING INSTRUCTIONS STEAM
PRESSURE ADJUSTMENTS
WARNING: Adjustments must be made only by trained and experienced service personnel.
Normally there is no need to make pressure adjustments on a new steamer, because the proper settings are made at the factory.
In some cases however, the factory setting may shift due to shaking in transit, and resetting will be required after installation. The
factory pressure settings shown on the accompanying chart should never be exceeded.
For Gas and Electric Steam Generator
Steam pressure is controlled with two pressure switches,
located toward the upper-front of the cabinet, either to the
extreme left or extreme right
The left switch is the operating pressure switch. This switch
controls the pressure in the steam generator, which is the
pressure indicated on the steam generator pressure gauge.
The right switch is a high-limit, pressure safety control. It
breaks an electric circuit to shut off the energy source if the
steam pressure rises above a safe level. Each
switch has a screw on top of the case, to permit the pressure
set point to be adjusted without removing the cover. The
correct settings are shown in the accompanying chart The
pressure switch indicator scale is for reference only. Actual
pressure should be read on the pressure gauge, and the
pressure switch adjusted to produce the proper pressure
gauge reading.
Some models may also have a pressure reducing valve to
control the pressure in the steam line to the steamer. The
adjustment of this is discussed further on.
For Steam Coil Steam Generator
The steam supply to steam coil generators is controlled by
one of two methods. Steam generator pressure may be
controlled by a pilot operated pressure regulating valve. The
steam generator pressure can be adjusted by turning the
adjusting collar, identified on the sketch. A steel rod is
provided to turn the collar. The correct settings are shown in
the accompanying chart.
On steam coil generators equipped with an electric solenoid
valve to control the steam supply to the steam generator,
one or two pressure switches control the steam generator
pressure. To adjust the switch(es), turn the screw on the top
of the case to achieve the pressure reading shown in the
accompanying chart.
Pressure Reducing Valve — Adjustment and Care
A screw at the top of the valve body, as shown on the sketch, permits the pressure set point to
be adjusted. The locknut must be loosened before adjustment is made, and tightened after.
Turning adjustment screw into housing raises pressure. If excessively high or tow pressure
can't be corrected by adjustment, install a new valve.
To eliminate erratic performance, the internal steam strainer should be cleaned periodically The
strainer can be reached by unscrewing the large hex head plug at the bottom of the valve body.
(CONTINUED ON THE REVERSE SIDE)