Setting of Steam Generator Control Pressure Switches
PRESSURE CONTROL SWITCH ADJUSTMENT
If generator fails to maintain steam pressure in
operating range, pressure control switch may
require adjustment.
1. Start generator and allow pressure to build up
to operating level -15 PSI
1 kg/cm
2
.
2.
Check generator pressure gauge. If gauge
indicates 12 to 14 PSI, pressure control
switches are properly adjusted.
3. If generator does not come on when pressure
gauge reads 12 PSI and does not go off when
pressure gauge reads 14 PSI, proceed as
follows:
a. Remove screws and lift front cover off control
box.
Warning: Because power must be on to
adjust pressure switches, be sure to
protect against electrical shock.
b. Hand adjust operating pressure control switch
(A) and high limit pressure control switch (B)
by turning adjusting nut (Knurled knob) clock
wise to raise and counterclockwise to lower
actuation point. Switch (A) should be set so that
generator comes on when generator pressure
gauge reads 12 PSI and goes off when gauge
reads 14 PSI. Switch (B) should be set so that
generator will shut off if pressure reaches 15
PSI. If 15 Ib. steam generator is used for 5 Ib.
operation, follow above instructions and then
refer to "adjusting watts
3/
4"
pressure reducing
valve".
c. The actuation value (differential) is factory set
and cannot be changed.
d. The cold water condenser thermostat is preset
at factory at 150°F 60°C and should not be
reset.
e. Repeat steps 1, 2, and 3. If 12 to 14 PSI
generator pressure gauge reading is obtained
during generator operation, adjustment is
correct. If proper adjustment cannot be made,
consult Trouble-Shooting Guide in this manual.
f. After making adjustments, replace cover on
control box.
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