Leslie Controls Unfired Steam Generator LVSG SERIES - Manual (Page 7)

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High pressure cut out
This is pressure limit which is set 10-20% higher than desired
operating pressure. When high pressure cut out pressure is
reached controller will cause main control valve to close.
1.
Press NEXT key three times and following screen will
appear:
Screen 4
HIGH PRESSURE
2. Press SELECT key and screen will read:
Screen 4
HIGH PRESSURE
CUT OFF PSI [XXX]
3.
Press NEXT key to scroll through pressure settings until
desired pressure setting appears on screen.. Settings from
0-50 psi are in 1 psi increments and from 50 through 150
psi in 5 psi increments. NOTE: MAXIMUM SETTING
IS LIMITED BY RANGE OF PRESSURE SENSOR.
high pressure setting should be set lower than
relieving pressure ASME relief valve supplied with
generator. Pressure rating of relief valve is labeled on
relief valve body.
4. Press SELECT key to place setting in memory and return
to home screen.
Low pressure alarm
If desired a low pressure alarm can be set. This will alarm if
generated steam pressure falls below low pressure setting.
To set low pressure alarm:
1.
Press NEXT key four times and following screen will
appear:
Screen 5
LOW PRESSURE
2.
Press SELECT key and screen will read:
Screen 5
LOW PRESSURE
ALARM PSI [XXX]
3.
Press NEXT key to scroll through pressure settings
until desired low pressure setting appears on screen..
Settings from 0-50 psi are in 1 psi increments.
Maximum low pressure setting is equal to high pressure
setting set on screen 4.
4. Press SELECT key to place setting in memory and
return to home screen.
NOTE: To disable low pressure alarm set pressure to zero (0).
High and low pressure reset differential
This is pressure differential from set point at which high or
low pressure will reset. Normally it is set at 2 psi but can be
set from 1 to 10 psi. NOTE: There is only one differential
setting and it will be same for both high and low pressure.
To set pressure differential:
1.
Press NEXT key five times and following screen will
appear:
Screen 6
DIFFERENTIAL
2.
Press SELECT key and screen will read:
Screen 6
DIFFERENTIAL
RESET PSI [XXX]
3.
Press NEXT key to scroll through psi settings until
desired psi differential is displayed. Range is 1-10 psi.
4. Press SELECT key to place setting in memory and
return to home screen.
Setting Pressure Sensor Range
pressure sensor supplied with Unfired Steam Generator will
have a specific range, normally 0-30 psi or 0-60 psi or 0-150
psi. It is extremely important that range of pressure
sensor and range listed in solid state controller be same
range. Generator is factory shipped with matched ranges.
Range of sensor will be printed on body of sensor. Range of
controller can be determined and if necessary changed as
follows:
1.
Press NEXT key six times and following screen will
appear:
Screen 7
PRESSURE SENSOR
2. Press SELECT key and screen will read:
Screen 7
PRESSURE SENSOR
RANGE PSI [XXX]
3. Verify that psi range shown is equal to range of supplied
sensor. Range shown on screen is upper end of range. 0-
30 will appear as 30 on screen, 0-60 will appear as 60 on
screen , etc. IF AND ONLY IF range of sensor is
different than screen setting should screen setting be
changed. To change screen setting press NEXT key to
scroll through various pressure settings. Available ranges
are 30-150 psi in 10 psi increments. When desired
pressure range appears on screen verify that this matches
pressure of sensor.
4. If both pressures match press SELECT key to place
setting in memory and return to home screen.
CAUTION
Operating pressure is set by control valve controller,
see USG I O & M manual for setting operating
pressure.