© 2022 Staheli West
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Tests
Test 9: OPLS Calibration [14.5 psi]
1. With the boiler full of water, hook up an air hose to the boiler to simulate pressure.
2. With the multimeter set to measure ohms, connect your pins to the terminals on
SR-4 and SR-5 as shown in #2.
3. The multimeter will read continuity until the OPLS trips.
4. Slowly pressurize the boiler while monitoring the steam pressure on the touch screen; take note at
what pressure the OPLS trips and whether adjustment is necessary. Menu > Diagnostics > Inputs
Outputs > Analog Inputs (the OPLS should be set to trip at 14.5 psi).
5. After the OPLS trips, release pressure to adjust OPLS by opening one of the pigtail valve (releasing
only a few psi is necessary; this will also reset the sensor automatically).
6. Loosen the set screw (5/64” Allen), and then increase OPLS psi by rotating the bolt in the bottom of
the housing clockwise.
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Test 10.A: Boiler Water Level Sensor Testing
*Check stem float clearance in the well.
1. Compare the touch screen boiler water level reading with the water in the boiler
sight glass. If the readings match, there is likely no problem with the sensor. If it does
not match or is giving erratic readings, continue to steps 2 & 3.
2. Remove boiler water level sensor (6 bolts 7/16”).
3. Move the float in increments of 1 inch and verify that the touch screen reading reflects accurately.
