Pressure Control
Control Board
Removal
1.
Relieve pressure; page 6.
2.Fig. 10. Remove four screws (11) and display/cover (12). Pull display connector wings open on PC board and pull display connector out.
3.Fig. 17. Disconnect at control board (147):
DLead (D) from potentiometer.
DLead (E) from transducer.
DRemove ON/OFF switch (51) at connector (A).
4.Fig. 10. Remove six screws (44) from control board (147) and green ground wire.
5.Remove connector (Ref 4) at backside of pressure control. Remove jam nut (147a) and control board (147).
Installation
When installing replacement control board, follow instructions with control board to set model type.
1.Fig. 10. Install control board (147) and jam nut (147a). Install connector (Ref 4) at backside of pressure control.
2.Install green ground wire and control board (147) with six screws (44).
3.Fig. 17. Connect to control board (147):
DConnect ON/OFF switch (51) connector (A).
DLead (E) to transducer.
DLead (D) to potentiometer.
4.Fig. 10. Push display connector into PC board close display connector wings on PC board. Install display/cover (12) with four screws (11).
Pressure Control Transducer
Removal
1.
Relieve pressure; page 6.
2.Fig. 10. Remove four screws (11) and display/cover (12).
3.Disconnect lead (E) from control board (147).
4.Remove two screws (141) and transducer guard (178) from control housing (8). Pull transducer connector through rubber grommet (176).
5.Remove pressure control transducer (100q) and o-ring (100p) from filter housing (100e).
Installation
1.Fig. 10. Install o-ring (100p) and pressure control transducer (100q) in filter housing (100e). Torque to 30–36 ft-lb.
2.Install transducer connector and rubber grommet
(176)in control housing (8) . Install transducer guard (178) on control housing with two screws
(141).
3.Connect lead (E) to control board (147).
4.Install display/cover (12) with four screws (11).
Pressure Adjust Potentiometer
Removal
1.
Relieve pressure; page 6.
2.Fig. 10. Remove four screws (11) and display/cover (12).
3.Disconnect lead (D) from control board (147).
4.Loosen set screws on potentiometer knob (13) and remove knob, shaft nut, lockwasher (22) and pressure adjust potentiometer (22).
5.Remove seal (78) from potentiometer (22).
Installation
1.Install seal (33) on potentiometer (22).
2.Fig. 10. Install pressure adjust potentiometer (22), shaft nut, lockwasher (22) and potentiometer knob (13).
a.Turn potentiometer shaft (22) clockwise to internal stop. Assemble potentiometer knob (13) to strike pin on plate (50).
b.After adjustment of step a., tighten both set screws in knob 1/4 to 3/8 turn after contact with shaft.
3.Connect lead (D) to control board (147).
4.Install display/cover (12) with four screws (11).
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