Rotary pneumatic positioner F793
Installation and Maintenance Instructions
Pentair reserves the right to change the contents without notice HDLDS-0046-EN-1309
Operation
Mounting to Pentair’s PremiAir and Keystone’s F79U, F79E, F790 and F796 series actuators.
1. For standard direct action operation (increasing signal to open actuator), ensure that the actuator
is in its CLOSED (fully clockwise) position, and that the flats on top of the positioner shaft are at
right angles to the longitudinal axis of the positioner.
For reverse action (increasing signal to close actuator), ensure that the actuator is in its OPEN
(fully anti-clockwise) position and that the flats on top of the positioner shaft are parallel to the
longitudinal axis of the positioner.
2. Fit the positioner to the top face of the actuator, using the correct mounting kit, so that the
longitudinal axis of the positioner is parallel to the actuator cylinder axis.
3. Ensure that the feedback cam in the positioner is correctly fitted with the correct range profile
bearing against the feedback arm roller.
(Positioners are stocked to suit 3-15 psig and direct action).
For direct action, ensure that anti-clockwise rotation of the positioner shaft will cause the cam to
compress the spring.
For reverse operation, ensure that clockwise rotation of the positioner shaft will cause the cam to
compress the spring.
4. Connect the air ports as shown in Fig. 1 for direct action and in Fig. 2 for reverse action.
Feedback Cam
Signal
Air
supply
To actuator
open port
Figure 1 - Direct operation
To actuator
close port
Exhaust
(on underside)
Feedback Cam
Signal
Air
supply
To actuator
close port
Figure 2 - Reverse operation
To actuator
open port
Exhaust
(on underside)
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