311020
18
Pressure Control
Control Board
Removal
1. Relieve pressure, page 7.
2. Fig. 13. Remove two screws (125) and
control cover (31). Pull display connector wings
open on PC board and pull display connector out.
3. Figs. 13 and 21. Note on a paper lead connections
to the control board. Disconnect leads from control
board (15d).
4. Fig. 13. Remove four screws (15j) from control
board (15d).
Installation
1. Fig. 13. Install control board (15d) with four
screws (15j).
2. Figs. 13 and 21. Refer to note on lead connections
to the control board. Connect leads to control
board (15d).
3. Fig. 13. Push display connector into PC board
close display connector wings on PC board. Install
control cover (31) with two screws (125).
Pressure Control Transducer
Removal
1. Relieve pressure, page 7.
2. Fig. 13. Remove two screws (125) and
control cover (31).
3. Disconnect transducer lead (C) from control
board (15d).
4. Remove pressure control transducer (216) and
o-ring (217) from filter manifold (40).
Installation
1. Fig. 13. Install o-ring (217) and pressure control
transducer (216) in filter manifold (40). Torque to
35--45 ft-lb.
2. Connect transducer lead (C) to control
board (15d).
3. Install control cover (31) with two screws (125).
Pressure Adjust Potentiometer
Removal
1. Relieve pressure, page 7.
2. Fig. 13. Remove two screws (125) and
control cover (31).
3. Disconnect lead (D) from control board (15d).
4. Loosen set screws on potentiometer knob (15o)
and remove knob, shaft nut, lockwasher and
pressure adjust potentiometer (15i).
5. Remove seal (15n) from potentiometer (15i).
Installation
1. Install seal (15n) on potentiometer (15i).
2. Fig. 13. Install pressure adjust potentiometer (15i),
shaft nut, lockwasher and potentiometer
knob (15o).
a. Turn potentiometer shaft (15i) clockwise to
internal stop. Assemble potentiometer knob
(15o) to strike pin on plate (15r).
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 (15d).
4. Install control cover (31) with two screws (125).
