Page 6
DISASSEMBLY
- Cont’d
THREE-WAY SOLENOID (PN 730474):
Note the orientation of Three-Way Solenoid on Scaler
plate (see Fig. 15). Remove tubing at Three-Way
Solenoid. Remove Motor/Scaler cable connector on
Power/ Display Board. Remove red and black wires
coming from Solenoid. Remove nuts holding Scaler
plate with 5/16" socket. Remove Power and Fuse cable
connectors from Power/Display Board. Elevate the
plate to access the screws to Solenoid. Remove screw
with #1 Phillips head screwdriver. Remove fittings and
place on new valve.
Reassemble in the reverse order. Orientate Three-Way
Solenoid Valve so tube coming from Two-Way Solenoid
goes to fitting marked COM (common) on Three-Way
Solenoid. The fitting on top of Three-Way Solenoid
goes to Motor coolant On/Off Toggle Valve, and fitting
marked NC goes to Scaler coolant On/Off Toggle Valve.
MOTOR MODULE:
• FAN & COMPRESSOR COVER
Lay unit on its back and remove all containers (see Fig.
16). Remove Filter from Compressor Motor with chan-
nel locks. Remove the seven Cover-mounting screws
and washers with #2 Phillips-head screwdriver. Move
Cover up and out to expose wires. Disconnect power
cable connectors to Fan and remove ground wire at
Motor. Remove Cover from Case. Note orientation of
Fan. Remove Fan fasteners with #1 Phillips-head
screwdriver and 5/16” socket.
Reassemble in the reverse order. Take care when rein-
stalling Cover that tubing from Compressor is not
kinked.
• COMPRESSOR MOTOR (PN 730503):
Remove Filter and Compressor Cover as previously
described in FAN DISASSEMBLY. Remove rubber
feet on bottom of unit case to expose screws (see Fig.
17). Remove the four mounting screws with #3 Phillips-
head screwdriver. Remove cable-tie holding down wires
on Motor. Remove ground wire with #2 screwdriver.
Cut wires at heatshrink to Motor. Lift Motor 90
º
and
remove pressure tube by removing clamp. (Note: Clamp
can be removed by sliding tabs sidways. Removal of
Tube is easier if heated slightly with heatshrink gun.)
Lift Motor from Case. Note orientation of fittings. Most
tubes can be left attached if not damaged. Remove
Venturi from large tube in center of Motor by pulling on
Venturi. Use adjustable 6” wrench to remove fitting and
place in new Motor. Push Venturi back into large tube
in middle of Motor. Remove feet and attach in same
orientation on new Motor.
Reassembly is done in the reverse order. Position Motor
in Case. Ensure that tubing is not kinked. Reattach
pressure hose with clamp (use pliers to tighten clamp).
Align Motor and mount to bottom of Case with screws
and countersunk nylon washers. Note, to level unit,
screws and nylon washers are used on front side, while
flat washers are added on back side only. Attach new
rubber feet. Attach ground wire to Motor. Solder and
heatshrink wires. Note that yellow goes to orange, and
two brown wires are attached to black and red wires
with blue bands. Use 6” wire tie to attach wires to tie
mount. Assemble Motor Cover and Filter as described
previously in FAN section.
Figure 15
Power
& Fuse
Cable
Conn.
Motor/
Scaler
Cable
Conn.
Power/DisplayBoard
Scaler
Coolant
On/Off
Toggle
Valve
Two
Way
Solenoid
Three
Way
Solenoid
Motor
Coolant
On/Off
Toggle
Valve
Figure 16
Fan
Cover
Fan
Power
Connectors
Filter
Ground
Wire
Fan
Guard
Fan
Fasteners