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Chapter 4 Maintenance Series 830/840/860 Instruction Manual
4-14 IM-83/84/86-H
slowly, 1/8 turn at a time and observe until the desired voltage
is obtained.
4. Now apply a 5% setpoint signal and confirm that the voltage
does not drop below 11 volts on the 30-volt circuit or 6 volts
on the 15-volt circuit. Go back and forth between these set-
tings and make sure that the voltages stay within these bounda-
ries. When this voltage “window” is obtained, the symptoms
should disappear and the lock nut can be re-tightened.
5. Re-install the electronics cover by powering down the control-
ler, removing the cable, putting the cover back on and replac-
ing the access door plugs. Reconnect the cable and apply the
power. A final check for leak-by with a zero set point and
proper flow with various control signals should be conducted.
Notes: Adjusting the valve voltage does not change the
calibration of the controller. If these adjustments do not
obtain the desired operation, contact Sierra directly.