Page 8
applied to fittings.
Reassemble in the reverse order.
• PRESSURE SENSOR (PN830067):
Remove tube to Pressure Sensor (see Fig. 21). Remove
wire connectors going to Pressure Sensor. Remove two
screws holding wires from Pressure Sensor to Relay.
Cut blue wire from wire harness close to ring terminal.
With 3/32" Allen wrench, remove two button-head
screws under Plumbing Chassis that attach pressure
bracket. Remove Pressure Sensor from Chassis.
Remove nut from Sensor with adjustable wrench.
Attach fitting to new Pressure Sensor.
Prepare new Pressure Sensor first when reassembling:
Cut red wire flush to Sensor (red wire not used). Cut
green wire 4" from Sensor. Cut 4" piece of remaining
green wire and attach to green wire from Sensor with
terminal (P/N 860239). Attach terminal (P/N 860240)
to other end of 4” green wire. Cut black wire from
Sensor to 2.5" and solder to anode (not the bar end) of
a diode (P/N 880030). Cut 2.5" piece of yellow wire (22
gauge - stranded) and solder to same end. Attach ter-
minal (P/N 860239) to yellow wire. Cut two 2.5" pieces
of yellow wire (22 gauge - stranded) and solder to cath-
ode (bar side) of wire. Heat shrink diode and solder
joints. Attach terminal (P/N 860240) to one of yellow
wires. Cut ¾" piece of blue wire (22 gauge-stranded)
and solder to cathode (bar side) on a diode (P/N
880030). Cut 3" piece of blue wire (22 gauge-stranded)
and solder to other side of diode. Twist short end of
blue wire cathode (bar side) of diode and remaining
yellow wire together. Heat shrink over diode. Attach
ring terminal (P/N 860004) to cathode (bar side).
Attach Pressure Sensor to bracket and reinstall tubing
and connectors. Note: Refer to electrical schematic for
electrical connections. It is best not to attach bracket to
the Plumbing Chassis prior to setting pressure. Twist
remaining blue wire with blue wire coming from cable
assembly and attach ring terminal (P/N 860004).
Remove setscrew from back of Pressure Sensor and
install Air and Water Bottles into their holders on
Chassis. Plug AEU-425CF/CFH System into power
source and turn the Pressure Sensor setscrew clockwise
until pressure gauge located on front of Plumbing
Chassis reads 50 P.S.I. Replace setscrew and attach
Pressure Sensor/bracket.
crimp on terminals (P/N 860102) when reattaching.
PLUMBING CHASSIS - Cont’d
• AIR PILOT VALVE (PN 730264):
Remove the three tubes going to Air Pilot Valve (see
Fig. 20). Remove nuts and washers with ¼" socket.
Remove bracket with two 9/16" open-end wrenches.
Remove fittings and place on new Air Pilot Valve.
Reassembly is done in the reverse order.
• SALIVA EJECTOR PUMP (PN 730348-08):
Remove tube from underside of Plumbing Chassis to
Saliva Ejector Vacuum Pump (see Fig. 20). Remove
Vacuum Pump with 3/32” Allen wrench. Remove fitting
from Pump. Attach fittings to new Pump. Note orien-
tation of plastic elbow. To prevent leakage, it is sug-
gested that Lex 8 lubricant/seal (P/N 490061) be
Figure 19
Solenoid
Mtg Hardware
(Air Filters not shown)
Compressor Tube
Snap Clamp
Air Reservoir
Snap Clamp
Air Reservoir
Tube
Violet Wire
w/Diode
Solenoid
Air Filter
Three-Way
Air Solenoid
Compressor Tube
Figure 20
Pilot
Valve
Bracket
Vacuum Pump
Tube
(under Chassis)
Air Pilot
Valve
Saliva
Ejector
Vacuum
Pump
Plastic
Elbow
Relay
Vacuum Pump
Tube Fitting