17
To test the compressor operating voltage (Figure 4):
The compressor requires line voltage to operate. If the com-
pressor does not start when the unit is turned on, the voltage
input must be tested:
1. This voltage can be checked at the compressor connector
using a voltmeter or test light connected to the brown and
blue wires.The voltmeter is the best way to test.
2. If no voltage is detected, disconnect power and check for
loose or broken wires between the compressor connector
and switch or wire harness.
3. If there is voltage at the compressor connector, then either
the capacitor or the compressor itself is defective.
To test the compressor for proper output:
NOTE: If the compressor is not providing a high enough
output the patient alert system may be activated.
1. Remove the front and back cabinets.
2. Connect a pressure-vacuum gauge to the accumulator tank
test point. See the section Accumulator Pressure Test in the
chapter “Component Testing, Repair, and Replacement” for
details on attaching the gauge.A defective compressor will be
indicated by slowly rising pressure. Pressure may only reach a
certain level and then stop.
If these conditions are observed then:
• The unit filter(s) may be occluded—check the air filter, intake
filter, and the compressor filter for occlusions.
• There may be a severe leak in the system—check for air
leaks using a leak detection solution.
• The compressor reed valves,Teflon ring, or the compres-
sor itself may be defective. (refer to Figure
12).
If the filters are not occluded and no leaks are found, the com-
pressor must then be removed and repaired or replaced.
To remove the compressor:
1. Make sure the unit is unplugged from the wall outlet.
2. Disconnect the compressor wires by disconnecting the white
electrical connector (Figure 4).
3. Remove the hose clamp and hose from the outlet fitting on
the compressor filter (Figure 4).
4. Remove the two screws from the back of the compressor
mounting plate(s) (Figure 4).
5. Remove the two
10 mm hex nuts that secure the mounting
plate to the front of the compressor housing (Figure 6).These
nuts are located on each side of the four-way valve.
6. Lift compressor and mounting plate up and out of the com-
pressor housing area.
7. Remove the tubing from the compressor intake port fitting.
CAUTION: If the unit has been running recently, the
compressor may be hot.
To inspect and/or replace internal components (Figure 14):
1. Remove the eight screws that hold the compressor heads in
place.When removing the heads, be sure to keep each head
and its components with the correct compressor side.
2. Check for proper placement of or damage to the gaskets on
the bottom of the compressor heads. Replace if damaged.
3. Remove reed valve plates.A reed valve is located on each side
of the valve plate.
4. The compressor reed valves should be flush with the valve
plate. If the valve is broken or not flush with the valve plate, or
foreign matter is detected inside the head, clean or replace the
compressor reed valves.
To replace the compressor reed valves (Figure 14):
a. Remove the screw holding the compressor reed valves in
position on the valve plate and discard the used reed valves.
b. Position the new reed valves so that they are centered and
completely cover the holes in the valve plate.
c. Place the metal retainer on the reed valves and secure
with the reed valve screw.
5. Check for proper placement of or damage to the rubber o-
ring on the bottom of the valve plate. Replace if damaged.
6. Remove piston sleeves by pulling upward and inspect Teflon
ring on pistons. Replace if badly worn or damaged.
To replace Teflon ring (Figure 14):
a. Remove screw from top of piston.
b. Remove the retainer plate.
c. Discard defective Teflon ring.
e. Place new Teflon ring into position.
f. Replace retainer plate.
g. Secure with screws.
7. Reposition sleeve on piston.
8. Place valve plates on the compressor so that heads of reed
valve screws are aligned with the indentation in top of pistons.
9. Install the compressor heads so that the holes in the heads are
aligned with the holes in the compressor housing.
10. Secure compressor heads with the screws.
To replace the compressor:
NOTE: For mounting plate and motor mount removal, refer
to sections below.Also refer to steps used in removing the
compressor.
1. Inspect the motor mounts. Replace if damaged. Secure the
mounting plate(s) to the bottom of the new compressor using
the four compressor mounting hex nuts.
2. Reconnect tubing to the compressor intake fitting.
3. Position compressor on the base of the unit so that the studs
on the mounting plates are aligned with notches on the front
of the unit base.
4. Secure mounting plate with two screws on the back and install
nuts on the front side of the plate.
5. Reconnect hose to the fitting at compressor filter outlet.
6. Reconnect the compressor electrical connector.
COMPONENT TESTING, REPAIR, AND REPLACEMENT
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